diff --git a/hmp.c b/hmp.c
index aba728f0de369f710bd2cb2e86c39de8a204e931..83e287e0a4708843293ec18539ac5de1216bbe97 100644
--- a/hmp.c
+++ b/hmp.c
@@ -1344,12 +1344,11 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
 {
     const char *param = qdict_get_str(qdict, "parameter");
     const char *valuestr = qdict_get_str(qdict, "value");
-    int64_t valuebw = 0;
+    uint64_t valuebw = 0;
     long valueint = 0;
-    char *endp;
     Error *err = NULL;
     bool use_int_value = false;
-    int i;
+    int i, ret;
 
     for (i = 0; i < MIGRATION_PARAMETER__MAX; i++) {
         if (strcmp(param, MigrationParameter_lookup[i]) == 0) {
@@ -1385,9 +1384,9 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
                 break;
             case MIGRATION_PARAMETER_MAX_BANDWIDTH:
                 p.has_max_bandwidth = true;
-                valuebw = qemu_strtosz(valuestr, &endp);
-                if (valuebw < 0 || (size_t)valuebw != valuebw
-                    || *endp != '\0') {
+                ret = qemu_strtosz_MiB(valuestr, NULL, &valuebw);
+                if (ret < 0 || valuebw > INT64_MAX
+                    || (size_t)valuebw != valuebw) {
                     error_setg(&err, "Invalid size %s", valuestr);
                     goto cleanup;
                 }
diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index bf57e635d6b23d6364b25ebe0989d1e28c1585a2..82ce8378bfd84aee6e38c10a74b1eb41bb97b0f2 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -1267,10 +1267,11 @@ static void ivshmem_realize(PCIDevice *dev, Error **errp)
     if (s->sizearg == NULL) {
         s->legacy_size = 4 << 20; /* 4 MB default */
     } else {
-        char *end;
-        int64_t size = qemu_strtosz(s->sizearg, &end);
-        if (size < 0 || (size_t)size != size || *end != '\0'
-            || !is_power_of_2(size)) {
+        int ret;
+        uint64_t size;
+
+        ret = qemu_strtosz_MiB(s->sizearg, NULL, &size);
+        if (ret < 0 || (size_t)size != size || !is_power_of_2(size)) {
             error_setg(errp, "Invalid size %s", s->sizearg);
             return;
         }
diff --git a/include/qemu/cutils.h b/include/qemu/cutils.h
index 8033929139d736ecc6e966174e9972e09b9177bf..f0878eaafa523be8693b27bdf6630e872784c0b2 100644
--- a/include/qemu/cutils.h
+++ b/include/qemu/cutils.h
@@ -130,34 +130,19 @@ int qemu_strtol(const char *nptr, const char **endptr, int base,
                 long *result);
 int qemu_strtoul(const char *nptr, const char **endptr, int base,
                  unsigned long *result);
-int qemu_strtoll(const char *nptr, const char **endptr, int base,
-                 int64_t *result);
-int qemu_strtoull(const char *nptr, const char **endptr, int base,
+int qemu_strtoi64(const char *nptr, const char **endptr, int base,
+                  int64_t *result);
+int qemu_strtou64(const char *nptr, const char **endptr, int base,
                   uint64_t *result);
 
 int parse_uint(const char *s, unsigned long long *value, char **endptr,
                int base);
 int parse_uint_full(const char *s, unsigned long long *value, int base);
 
-/*
- * qemu_strtosz() suffixes used to specify the default treatment of an
- * argument passed to qemu_strtosz() without an explicit suffix.
- * These should be defined using upper case characters in the range
- * A-Z, as qemu_strtosz() will use qemu_toupper() on the given argument
- * prior to comparison.
- */
-#define QEMU_STRTOSZ_DEFSUFFIX_EB 'E'
-#define QEMU_STRTOSZ_DEFSUFFIX_PB 'P'
-#define QEMU_STRTOSZ_DEFSUFFIX_TB 'T'
-#define QEMU_STRTOSZ_DEFSUFFIX_GB 'G'
-#define QEMU_STRTOSZ_DEFSUFFIX_MB 'M'
-#define QEMU_STRTOSZ_DEFSUFFIX_KB 'K'
-#define QEMU_STRTOSZ_DEFSUFFIX_B 'B'
-int64_t qemu_strtosz(const char *nptr, char **end);
-int64_t qemu_strtosz_suffix(const char *nptr, char **end,
-                            const char default_suffix);
-int64_t qemu_strtosz_suffix_unit(const char *nptr, char **end,
-                            const char default_suffix, int64_t unit);
+int qemu_strtosz(const char *nptr, char **end, uint64_t *result);
+int qemu_strtosz_MiB(const char *nptr, char **end, uint64_t *result);
+int qemu_strtosz_metric(const char *nptr, char **end, uint64_t *result);
+
 #define K_BYTE     (1ULL << 10)
 #define M_BYTE     (1ULL << 20)
 #define G_BYTE     (1ULL << 30)
diff --git a/monitor.c b/monitor.c
index 5aff7aebb01282fcf6dd2aec212ae8c80258a3b8..f8f4a07cfb149128ec007ef75bc695047ac54452 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2799,7 +2799,8 @@ static QDict *monitor_parse_arguments(Monitor *mon,
             break;
         case 'o':
             {
-                int64_t val;
+                int ret;
+                uint64_t val;
                 char *end;
 
                 while (qemu_isspace(*p)) {
@@ -2811,8 +2812,8 @@ static QDict *monitor_parse_arguments(Monitor *mon,
                         break;
                     }
                 }
-                val = qemu_strtosz(p, &end);
-                if (val < 0) {
+                ret = qemu_strtosz_MiB(p, &end, &val);
+                if (ret < 0 || val > INT64_MAX) {
                     monitor_printf(mon, "invalid size\n");
                     goto fail;
                 }
diff --git a/qapi/opts-visitor.c b/qapi/opts-visitor.c
index 1048bbc84e1232c1615d002d5cc28704108a2922..a0a7c0e7347a6c1db3ff1a6cec804bba5b5bdef8 100644
--- a/qapi/opts-visitor.c
+++ b/qapi/opts-visitor.c
@@ -481,23 +481,20 @@ opts_type_size(Visitor *v, const char *name, uint64_t *obj, Error **errp)
 {
     OptsVisitor *ov = to_ov(v);
     const QemuOpt *opt;
-    int64_t val;
-    char *endptr;
+    int err;
 
     opt = lookup_scalar(ov, name, errp);
     if (!opt) {
         return;
     }
 
-    val = qemu_strtosz_suffix(opt->str ? opt->str : "", &endptr,
-                         QEMU_STRTOSZ_DEFSUFFIX_B);
-    if (val < 0 || *endptr) {
+    err = qemu_strtosz(opt->str ? opt->str : "", NULL, obj);
+    if (err < 0) {
         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, opt->name,
-                   "a size value representible as a non-negative int64");
+                   "a size value");
         return;
     }
 
-    *obj = val;
     processed(ov, name);
 }
 
diff --git a/qemu-img.c b/qemu-img.c
index cff22e300557e99e2b2f7fe1806b0caeca58df3c..df3aefd35a680c8ad7c3fd4e901b6087b527e9c2 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -368,6 +368,21 @@ static int add_old_style_options(const char *fmt, QemuOpts *opts,
     return 0;
 }
 
+static int64_t cvtnum(const char *s)
+{
+    int err;
+    uint64_t value;
+
+    err = qemu_strtosz(s, NULL, &value);
+    if (err < 0) {
+        return err;
+    }
+    if (value > INT64_MAX) {
+        return -ERANGE;
+    }
+    return value;
+}
+
 static int img_create(int argc, char **argv)
 {
     int c;
@@ -461,10 +476,9 @@ static int img_create(int argc, char **argv)
     /* Get image size, if specified */
     if (optind < argc) {
         int64_t sval;
-        char *end;
-        sval = qemu_strtosz_suffix(argv[optind++], &end,
-                                   QEMU_STRTOSZ_DEFSUFFIX_B);
-        if (sval < 0 || *end) {
+
+        sval = cvtnum(argv[optind++]);
+        if (sval < 0) {
             if (sval == -ERANGE) {
                 error_report("Image size must be less than 8 EiB!");
             } else {
@@ -1864,9 +1878,9 @@ static int img_convert(int argc, char **argv)
         case 'S':
         {
             int64_t sval;
-            char *end;
-            sval = qemu_strtosz_suffix(optarg, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
-            if (sval < 0 || *end) {
+
+            sval = cvtnum(optarg);
+            if (sval < 0) {
                 error_report("Invalid minimum zero buffer size for sparse output specified");
                 ret = -1;
                 goto fail_getopt;
@@ -3651,11 +3665,8 @@ static int img_bench(int argc, char **argv)
             break;
         case 'o':
         {
-            char *end;
-            errno = 0;
-            offset = qemu_strtosz_suffix(optarg, &end,
-                                         QEMU_STRTOSZ_DEFSUFFIX_B);
-            if (offset < 0|| *end) {
+            offset = cvtnum(optarg);
+            if (offset < 0) {
                 error_report("Invalid offset specified");
                 return 1;
             }
@@ -3668,10 +3679,9 @@ static int img_bench(int argc, char **argv)
         case 's':
         {
             int64_t sval;
-            char *end;
 
-            sval = qemu_strtosz_suffix(optarg, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
-            if (sval < 0 || sval > INT_MAX || *end) {
+            sval = cvtnum(optarg);
+            if (sval < 0 || sval > INT_MAX) {
                 error_report("Invalid buffer size specified");
                 return 1;
             }
@@ -3682,10 +3692,9 @@ static int img_bench(int argc, char **argv)
         case 'S':
         {
             int64_t sval;
-            char *end;
 
-            sval = qemu_strtosz_suffix(optarg, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
-            if (sval < 0 || sval > INT_MAX || *end) {
+            sval = cvtnum(optarg);
+            if (sval < 0 || sval > INT_MAX) {
                 error_report("Invalid step size specified");
                 return 1;
             }
@@ -3844,12 +3853,11 @@ static int img_dd_bs(const char *arg,
                      struct DdIo *in, struct DdIo *out,
                      struct DdInfo *dd)
 {
-    char *end;
     int64_t res;
 
-    res = qemu_strtosz_suffix(arg, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
+    res = cvtnum(arg);
 
-    if (res <= 0 || res > INT_MAX || *end) {
+    if (res <= 0 || res > INT_MAX) {
         error_report("invalid number: '%s'", arg);
         return 1;
     }
@@ -3862,11 +3870,9 @@ static int img_dd_count(const char *arg,
                         struct DdIo *in, struct DdIo *out,
                         struct DdInfo *dd)
 {
-    char *end;
+    dd->count = cvtnum(arg);
 
-    dd->count = qemu_strtosz_suffix(arg, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
-
-    if (dd->count < 0 || *end) {
+    if (dd->count < 0) {
         error_report("invalid number: '%s'", arg);
         return 1;
     }
@@ -3896,11 +3902,9 @@ static int img_dd_skip(const char *arg,
                        struct DdIo *in, struct DdIo *out,
                        struct DdInfo *dd)
 {
-    char *end;
-
-    in->offset = qemu_strtosz_suffix(arg, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
+    in->offset = cvtnum(arg);
 
-    if (in->offset < 0 || *end) {
+    if (in->offset < 0) {
         error_report("invalid number: '%s'", arg);
         return 1;
     }
diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index e415b03cd0b0bf9074fc482b7e8fb5f01521cf2a..7ac1576d4c58d878ea849d11ed085c1f10932916 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -137,15 +137,17 @@ static char **breakline(char *input, int *count)
 
 static int64_t cvtnum(const char *s)
 {
-    char *end;
-    int64_t ret;
+    int err;
+    uint64_t value;
 
-    ret = qemu_strtosz_suffix(s, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
-    if (*end != '\0') {
-        /* Detritus at the end of the string */
-        return -EINVAL;
+    err = qemu_strtosz(s, NULL, &value);
+    if (err < 0) {
+        return err;
     }
-    return ret;
+    if (value > INT64_MAX) {
+        return -ERANGE;
+    }
+    return value;
 }
 
 static void print_cvtnum_err(int64_t rc, const char *arg)
diff --git a/qobject/qdict.c b/qobject/qdict.c
index b0c53645060038e0e3de73293ac2113d3f9f5f6e..291eef1a199d8757b5a521b12cb7fb39cd9a80e9 100644
--- a/qobject/qdict.c
+++ b/qobject/qdict.c
@@ -743,7 +743,7 @@ static int qdict_is_list(QDict *maybe_list, Error **errp)
     for (ent = qdict_first(maybe_list); ent != NULL;
          ent = qdict_next(maybe_list, ent)) {
 
-        if (qemu_strtoll(ent->key, NULL, 10, &val) == 0) {
+        if (qemu_strtoi64(ent->key, NULL, 10, &val) == 0) {
             if (is_list == -1) {
                 is_list = 1;
             } else if (!is_list) {
diff --git a/qtest.c b/qtest.c
index 1446719e8ddcc320c90719aaa1c76e983041495d..a6858272eb02603ff128d2c4b351c21b570fc59e 100644
--- a/qtest.c
+++ b/qtest.c
@@ -373,8 +373,8 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         uint64_t value;
 
         g_assert(words[1] && words[2]);
-        g_assert(qemu_strtoull(words[1], NULL, 0, &addr) == 0);
-        g_assert(qemu_strtoull(words[2], NULL, 0, &value) == 0);
+        g_assert(qemu_strtou64(words[1], NULL, 0, &addr) == 0);
+        g_assert(qemu_strtou64(words[2], NULL, 0, &value) == 0);
 
         if (words[0][5] == 'b') {
             uint8_t data = value;
@@ -402,7 +402,7 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         uint64_t value = UINT64_C(-1);
 
         g_assert(words[1]);
-        g_assert(qemu_strtoull(words[1], NULL, 0, &addr) == 0);
+        g_assert(qemu_strtou64(words[1], NULL, 0, &addr) == 0);
 
         if (words[0][4] == 'b') {
             uint8_t data;
@@ -428,8 +428,8 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         char *enc;
 
         g_assert(words[1] && words[2]);
-        g_assert(qemu_strtoull(words[1], NULL, 0, &addr) == 0);
-        g_assert(qemu_strtoull(words[2], NULL, 0, &len) == 0);
+        g_assert(qemu_strtou64(words[1], NULL, 0, &addr) == 0);
+        g_assert(qemu_strtou64(words[2], NULL, 0, &len) == 0);
         /* We'd send garbage to libqtest if len is 0 */
         g_assert(len);
 
@@ -452,8 +452,8 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         gchar *b64_data;
 
         g_assert(words[1] && words[2]);
-        g_assert(qemu_strtoull(words[1], NULL, 0, &addr) == 0);
-        g_assert(qemu_strtoull(words[2], NULL, 0, &len) == 0);
+        g_assert(qemu_strtou64(words[1], NULL, 0, &addr) == 0);
+        g_assert(qemu_strtou64(words[2], NULL, 0, &len) == 0);
 
         data = g_malloc(len);
         cpu_physical_memory_read(addr, data, len);
@@ -469,8 +469,8 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         size_t data_len;
 
         g_assert(words[1] && words[2] && words[3]);
-        g_assert(qemu_strtoull(words[1], NULL, 0, &addr) == 0);
-        g_assert(qemu_strtoull(words[2], NULL, 0, &len) == 0);
+        g_assert(qemu_strtou64(words[1], NULL, 0, &addr) == 0);
+        g_assert(qemu_strtou64(words[2], NULL, 0, &len) == 0);
 
         data_len = strlen(words[3]);
         if (data_len < 3) {
@@ -498,8 +498,8 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         unsigned long pattern;
 
         g_assert(words[1] && words[2] && words[3]);
-        g_assert(qemu_strtoull(words[1], NULL, 0, &addr) == 0);
-        g_assert(qemu_strtoull(words[2], NULL, 0, &len) == 0);
+        g_assert(qemu_strtou64(words[1], NULL, 0, &addr) == 0);
+        g_assert(qemu_strtou64(words[2], NULL, 0, &len) == 0);
         g_assert(qemu_strtoul(words[3], NULL, 0, &pattern) == 0);
 
         if (len) {
@@ -518,8 +518,8 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         gsize out_len;
 
         g_assert(words[1] && words[2] && words[3]);
-        g_assert(qemu_strtoull(words[1], NULL, 0, &addr) == 0);
-        g_assert(qemu_strtoull(words[2], NULL, 0, &len) == 0);
+        g_assert(qemu_strtou64(words[1], NULL, 0, &addr) == 0);
+        g_assert(qemu_strtou64(words[2], NULL, 0, &len) == 0);
 
         data_len = strlen(words[3]);
         if (data_len < 3) {
@@ -552,9 +552,9 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         unsigned long nargs, nret;
 
         g_assert(qemu_strtoul(words[2], NULL, 0, &nargs) == 0);
-        g_assert(qemu_strtoull(words[3], NULL, 0, &args) == 0);
+        g_assert(qemu_strtou64(words[3], NULL, 0, &args) == 0);
         g_assert(qemu_strtoul(words[4], NULL, 0, &nret) == 0);
-        g_assert(qemu_strtoull(words[5], NULL, 0, &ret) == 0);
+        g_assert(qemu_strtou64(words[5], NULL, 0, &ret) == 0);
         res = qtest_rtas_call(words[1], nargs, args, nret, ret);
 
         qtest_send_prefix(chr);
@@ -564,7 +564,7 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         int64_t ns;
 
         if (words[1]) {
-            g_assert(qemu_strtoll(words[1], NULL, 0, &ns) == 0);
+            g_assert(qemu_strtoi64(words[1], NULL, 0, &ns) == 0);
         } else {
             ns = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
         }
@@ -576,7 +576,7 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         int64_t ns;
 
         g_assert(words[1]);
-        g_assert(qemu_strtoll(words[1], NULL, 0, &ns) == 0);
+        g_assert(qemu_strtoi64(words[1], NULL, 0, &ns) == 0);
         qtest_clock_warp(ns);
         qtest_send_prefix(chr);
         qtest_sendf(chr, "OK %"PRIi64"\n",
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index fd7add2521693d9a03d48fdbf016b71ab1ebb0df..b6f157dca310751a23b3386337a44484fe5cc5d6 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -2033,12 +2033,11 @@ static void x86_cpu_parse_featurestr(const char *typename, char *features,
 
         /* Special case: */
         if (!strcmp(name, "tsc-freq")) {
-            int64_t tsc_freq;
-            char *err;
+            int ret;
+            uint64_t tsc_freq;
 
-            tsc_freq = qemu_strtosz_suffix_unit(val, &err,
-                                           QEMU_STRTOSZ_DEFSUFFIX_B, 1000);
-            if (tsc_freq < 0 || *err) {
+            ret = qemu_strtosz_metric(val, NULL, &tsc_freq);
+            if (ret < 0 || tsc_freq > INT64_MAX) {
                 error_setg(errp, "bad numerical value %s", val);
                 return;
             }
diff --git a/tests/test-cutils.c b/tests/test-cutils.c
index 20b0f59ba2c0e007c8f9e23b90d1f8445b9465bc..f64a49b7fba1a7fa922f6af76d0a4d5795b422c8 100644
--- a/tests/test-cutils.c
+++ b/tests/test-cutils.c
@@ -262,6 +262,7 @@ static void test_qemu_strtol_empty(void)
     err = qemu_strtol(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
 }
 
 static void test_qemu_strtol_whitespace(void)
@@ -275,6 +276,7 @@ static void test_qemu_strtol_whitespace(void)
     err = qemu_strtol(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
 }
 
 static void test_qemu_strtol_invalid(void)
@@ -288,6 +290,7 @@ static void test_qemu_strtol_invalid(void)
     err = qemu_strtol(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
 }
 
 static void test_qemu_strtol_trailing(void)
@@ -520,7 +523,7 @@ static void test_qemu_strtoul_correct(void)
     err = qemu_strtoul(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 12345);
+    g_assert_cmpuint(res, ==, 12345);
     g_assert(endptr == str + 5);
 }
 
@@ -548,6 +551,7 @@ static void test_qemu_strtoul_empty(void)
     err = qemu_strtoul(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
 }
 
 static void test_qemu_strtoul_whitespace(void)
@@ -561,6 +565,7 @@ static void test_qemu_strtoul_whitespace(void)
     err = qemu_strtoul(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
 }
 
 static void test_qemu_strtoul_invalid(void)
@@ -574,6 +579,7 @@ static void test_qemu_strtoul_invalid(void)
     err = qemu_strtoul(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
 }
 
 static void test_qemu_strtoul_trailing(void)
@@ -587,7 +593,7 @@ static void test_qemu_strtoul_trailing(void)
     err = qemu_strtoul(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 123);
+    g_assert_cmpuint(res, ==, 123);
     g_assert(endptr == str + 3);
 }
 
@@ -602,7 +608,7 @@ static void test_qemu_strtoul_octal(void)
     err = qemu_strtoul(str, &endptr, 8, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 0123);
+    g_assert_cmpuint(res, ==, 0123);
     g_assert(endptr == str + strlen(str));
 
     res = 999;
@@ -610,7 +616,7 @@ static void test_qemu_strtoul_octal(void)
     err = qemu_strtoul(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 0123);
+    g_assert_cmpuint(res, ==, 0123);
     g_assert(endptr == str + strlen(str));
 }
 
@@ -625,7 +631,7 @@ static void test_qemu_strtoul_decimal(void)
     err = qemu_strtoul(str, &endptr, 10, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 123);
+    g_assert_cmpuint(res, ==, 123);
     g_assert(endptr == str + strlen(str));
 
     str = "123";
@@ -634,7 +640,7 @@ static void test_qemu_strtoul_decimal(void)
     err = qemu_strtoul(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 123);
+    g_assert_cmpuint(res, ==, 123);
     g_assert(endptr == str + strlen(str));
 }
 
@@ -649,7 +655,7 @@ static void test_qemu_strtoul_hex(void)
     err = qemu_strtoul(str, &endptr, 16, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 0x123);
+    g_assert_cmphex(res, ==, 0x123);
     g_assert(endptr == str + strlen(str));
 
     str = "0x123";
@@ -658,7 +664,7 @@ static void test_qemu_strtoul_hex(void)
     err = qemu_strtoul(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 0x123);
+    g_assert_cmphex(res, ==, 0x123);
     g_assert(endptr == str + strlen(str));
 }
 
@@ -673,7 +679,7 @@ static void test_qemu_strtoul_max(void)
     err = qemu_strtoul(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, ULONG_MAX);
+    g_assert_cmphex(res, ==, ULONG_MAX);
     g_assert(endptr == str + strlen(str));
     g_free(str);
 }
@@ -689,7 +695,7 @@ static void test_qemu_strtoul_overflow(void)
     err = qemu_strtoul(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -ERANGE);
-    g_assert_cmpint(res, ==, ULONG_MAX);
+    g_assert_cmphex(res, ==, ULONG_MAX);
     g_assert(endptr == str + strlen(str));
 }
 
@@ -704,7 +710,7 @@ static void test_qemu_strtoul_underflow(void)
     err  = qemu_strtoul(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -ERANGE);
-    g_assert_cmpint(res, ==, -1ul);
+    g_assert_cmpuint(res, ==, -1ul);
     g_assert(endptr == str + strlen(str));
 }
 
@@ -719,7 +725,7 @@ static void test_qemu_strtoul_negative(void)
     err = qemu_strtoul(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, -321ul);
+    g_assert_cmpuint(res, ==, -321ul);
     g_assert(endptr == str + strlen(str));
 }
 
@@ -732,7 +738,7 @@ static void test_qemu_strtoul_full_correct(void)
     err = qemu_strtoul(str, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 123);
+    g_assert_cmpuint(res, ==, 123);
 }
 
 static void test_qemu_strtoul_full_null(void)
@@ -763,7 +769,7 @@ static void test_qemu_strtoul_full_negative(void)
 
     err = qemu_strtoul(str, NULL, 0, &res);
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, -321ul);
+    g_assert_cmpuint(res, ==, -321ul);
 }
 
 static void test_qemu_strtoul_full_trailing(void)
@@ -786,11 +792,11 @@ static void test_qemu_strtoul_full_max(void)
     err = qemu_strtoul(str, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, ULONG_MAX);
+    g_assert_cmphex(res, ==, ULONG_MAX);
     g_free(str);
 }
 
-static void test_qemu_strtoll_correct(void)
+static void test_qemu_strtoi64_correct(void)
 {
     const char *str = "12345 foo";
     char f = 'X';
@@ -798,27 +804,27 @@ static void test_qemu_strtoll_correct(void)
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, &endptr, 0, &res);
+    err = qemu_strtoi64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 12345);
     g_assert(endptr == str + 5);
 }
 
-static void test_qemu_strtoll_null(void)
+static void test_qemu_strtoi64_null(void)
 {
     char f = 'X';
     const char *endptr = &f;
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(NULL, &endptr, 0, &res);
+    err = qemu_strtoi64(NULL, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
     g_assert(endptr == NULL);
 }
 
-static void test_qemu_strtoll_empty(void)
+static void test_qemu_strtoi64_empty(void)
 {
     const char *str = "";
     char f = 'X';
@@ -826,12 +832,13 @@ static void test_qemu_strtoll_empty(void)
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, &endptr, 0, &res);
+    err = qemu_strtoi64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
 }
 
-static void test_qemu_strtoll_whitespace(void)
+static void test_qemu_strtoi64_whitespace(void)
 {
     const char *str = "  \t  ";
     char f = 'X';
@@ -839,12 +846,13 @@ static void test_qemu_strtoll_whitespace(void)
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, &endptr, 0, &res);
+    err = qemu_strtoi64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
 }
 
-static void test_qemu_strtoll_invalid(void)
+static void test_qemu_strtoi64_invalid(void)
 {
     const char *str = "   xxxx  \t abc";
     char f = 'X';
@@ -852,12 +860,13 @@ static void test_qemu_strtoll_invalid(void)
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, &endptr, 0, &res);
+    err = qemu_strtoi64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
 }
 
-static void test_qemu_strtoll_trailing(void)
+static void test_qemu_strtoi64_trailing(void)
 {
     const char *str = "123xxx";
     char f = 'X';
@@ -865,14 +874,14 @@ static void test_qemu_strtoll_trailing(void)
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, &endptr, 0, &res);
+    err = qemu_strtoi64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 123);
     g_assert(endptr == str + 3);
 }
 
-static void test_qemu_strtoll_octal(void)
+static void test_qemu_strtoi64_octal(void)
 {
     const char *str = "0123";
     char f = 'X';
@@ -880,7 +889,7 @@ static void test_qemu_strtoll_octal(void)
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, &endptr, 8, &res);
+    err = qemu_strtoi64(str, &endptr, 8, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0123);
@@ -888,14 +897,14 @@ static void test_qemu_strtoll_octal(void)
 
     endptr = &f;
     res = 999;
-    err = qemu_strtoll(str, &endptr, 0, &res);
+    err = qemu_strtoi64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0123);
     g_assert(endptr == str + strlen(str));
 }
 
-static void test_qemu_strtoll_decimal(void)
+static void test_qemu_strtoi64_decimal(void)
 {
     const char *str = "0123";
     char f = 'X';
@@ -903,7 +912,7 @@ static void test_qemu_strtoll_decimal(void)
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, &endptr, 10, &res);
+    err = qemu_strtoi64(str, &endptr, 10, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 123);
@@ -912,14 +921,14 @@ static void test_qemu_strtoll_decimal(void)
     str = "123";
     endptr = &f;
     res = 999;
-    err = qemu_strtoll(str, &endptr, 0, &res);
+    err = qemu_strtoi64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 123);
     g_assert(endptr == str + strlen(str));
 }
 
-static void test_qemu_strtoll_hex(void)
+static void test_qemu_strtoi64_hex(void)
 {
     const char *str = "0123";
     char f = 'X';
@@ -927,7 +936,7 @@ static void test_qemu_strtoll_hex(void)
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, &endptr, 16, &res);
+    err = qemu_strtoi64(str, &endptr, 16, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0x123);
@@ -936,14 +945,14 @@ static void test_qemu_strtoll_hex(void)
     str = "0x123";
     endptr = &f;
     res = 999;
-    err = qemu_strtoll(str, &endptr, 0, &res);
+    err = qemu_strtoi64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0x123);
     g_assert(endptr == str + strlen(str));
 }
 
-static void test_qemu_strtoll_max(void)
+static void test_qemu_strtoi64_max(void)
 {
     char *str = g_strdup_printf("%lld", LLONG_MAX);
     char f = 'X';
@@ -951,7 +960,7 @@ static void test_qemu_strtoll_max(void)
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, &endptr, 0, &res);
+    err = qemu_strtoi64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, LLONG_MAX);
@@ -959,7 +968,7 @@ static void test_qemu_strtoll_max(void)
     g_free(str);
 }
 
-static void test_qemu_strtoll_overflow(void)
+static void test_qemu_strtoi64_overflow(void)
 {
     const char *str = "99999999999999999999999999999999999999999999";
     char f = 'X';
@@ -967,14 +976,14 @@ static void test_qemu_strtoll_overflow(void)
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, &endptr, 0, &res);
+    err = qemu_strtoi64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -ERANGE);
     g_assert_cmpint(res, ==, LLONG_MAX);
     g_assert(endptr == str + strlen(str));
 }
 
-static void test_qemu_strtoll_underflow(void)
+static void test_qemu_strtoi64_underflow(void)
 {
     const char *str = "-99999999999999999999999999999999999999999999";
     char f = 'X';
@@ -982,14 +991,14 @@ static void test_qemu_strtoll_underflow(void)
     int64_t res = 999;
     int err;
 
-    err  = qemu_strtoll(str, &endptr, 0, &res);
+    err  = qemu_strtoi64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -ERANGE);
     g_assert_cmpint(res, ==, LLONG_MIN);
     g_assert(endptr == str + strlen(str));
 }
 
-static void test_qemu_strtoll_negative(void)
+static void test_qemu_strtoi64_negative(void)
 {
     const char *str = "  \t -321";
     char f = 'X';
@@ -997,84 +1006,84 @@ static void test_qemu_strtoll_negative(void)
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, &endptr, 0, &res);
+    err = qemu_strtoi64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, -321);
     g_assert(endptr == str + strlen(str));
 }
 
-static void test_qemu_strtoll_full_correct(void)
+static void test_qemu_strtoi64_full_correct(void)
 {
     const char *str = "123";
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, NULL, 0, &res);
+    err = qemu_strtoi64(str, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 123);
 }
 
-static void test_qemu_strtoll_full_null(void)
+static void test_qemu_strtoi64_full_null(void)
 {
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(NULL, NULL, 0, &res);
+    err = qemu_strtoi64(NULL, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
 }
 
-static void test_qemu_strtoll_full_empty(void)
+static void test_qemu_strtoi64_full_empty(void)
 {
     const char *str = "";
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, NULL, 0, &res);
+    err = qemu_strtoi64(str, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
 }
 
-static void test_qemu_strtoll_full_negative(void)
+static void test_qemu_strtoi64_full_negative(void)
 {
     const char *str = " \t -321";
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, NULL, 0, &res);
+    err = qemu_strtoi64(str, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, -321);
 }
 
-static void test_qemu_strtoll_full_trailing(void)
+static void test_qemu_strtoi64_full_trailing(void)
 {
     const char *str = "123xxx";
     int64_t res = 999;
     int err;
 
-    err = qemu_strtoll(str, NULL, 0, &res);
+    err = qemu_strtoi64(str, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
 }
 
-static void test_qemu_strtoll_full_max(void)
+static void test_qemu_strtoi64_full_max(void)
 {
 
     char *str = g_strdup_printf("%lld", LLONG_MAX);
     int64_t res;
     int err;
 
-    err = qemu_strtoll(str, NULL, 0, &res);
+    err = qemu_strtoi64(str, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, LLONG_MAX);
     g_free(str);
 }
 
-static void test_qemu_strtoull_correct(void)
+static void test_qemu_strtou64_correct(void)
 {
     const char *str = "12345 foo";
     char f = 'X';
@@ -1082,27 +1091,27 @@ static void test_qemu_strtoull_correct(void)
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, &endptr, 0, &res);
+    err = qemu_strtou64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 12345);
+    g_assert_cmpuint(res, ==, 12345);
     g_assert(endptr == str + 5);
 }
 
-static void test_qemu_strtoull_null(void)
+static void test_qemu_strtou64_null(void)
 {
     char f = 'X';
     const char *endptr = &f;
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(NULL, &endptr, 0, &res);
+    err = qemu_strtou64(NULL, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
     g_assert(endptr == NULL);
 }
 
-static void test_qemu_strtoull_empty(void)
+static void test_qemu_strtou64_empty(void)
 {
     const char *str = "";
     char f = 'X';
@@ -1110,12 +1119,13 @@ static void test_qemu_strtoull_empty(void)
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, &endptr, 0, &res);
+    err = qemu_strtou64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
 }
 
-static void test_qemu_strtoull_whitespace(void)
+static void test_qemu_strtou64_whitespace(void)
 {
     const char *str = "  \t  ";
     char f = 'X';
@@ -1123,12 +1133,13 @@ static void test_qemu_strtoull_whitespace(void)
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, &endptr, 0, &res);
+    err = qemu_strtou64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
 }
 
-static void test_qemu_strtoull_invalid(void)
+static void test_qemu_strtou64_invalid(void)
 {
     const char *str = "   xxxx  \t abc";
     char f = 'X';
@@ -1136,12 +1147,13 @@ static void test_qemu_strtoull_invalid(void)
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, &endptr, 0, &res);
+    err = qemu_strtou64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
 }
 
-static void test_qemu_strtoull_trailing(void)
+static void test_qemu_strtou64_trailing(void)
 {
     const char *str = "123xxx";
     char f = 'X';
@@ -1149,14 +1161,14 @@ static void test_qemu_strtoull_trailing(void)
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, &endptr, 0, &res);
+    err = qemu_strtou64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 123);
+    g_assert_cmpuint(res, ==, 123);
     g_assert(endptr == str + 3);
 }
 
-static void test_qemu_strtoull_octal(void)
+static void test_qemu_strtou64_octal(void)
 {
     const char *str = "0123";
     char f = 'X';
@@ -1164,22 +1176,22 @@ static void test_qemu_strtoull_octal(void)
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, &endptr, 8, &res);
+    err = qemu_strtou64(str, &endptr, 8, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 0123);
+    g_assert_cmpuint(res, ==, 0123);
     g_assert(endptr == str + strlen(str));
 
     endptr = &f;
     res = 999;
-    err = qemu_strtoull(str, &endptr, 0, &res);
+    err = qemu_strtou64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 0123);
+    g_assert_cmpuint(res, ==, 0123);
     g_assert(endptr == str + strlen(str));
 }
 
-static void test_qemu_strtoull_decimal(void)
+static void test_qemu_strtou64_decimal(void)
 {
     const char *str = "0123";
     char f = 'X';
@@ -1187,23 +1199,23 @@ static void test_qemu_strtoull_decimal(void)
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, &endptr, 10, &res);
+    err = qemu_strtou64(str, &endptr, 10, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 123);
+    g_assert_cmpuint(res, ==, 123);
     g_assert(endptr == str + strlen(str));
 
     str = "123";
     endptr = &f;
     res = 999;
-    err = qemu_strtoull(str, &endptr, 0, &res);
+    err = qemu_strtou64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 123);
+    g_assert_cmpuint(res, ==, 123);
     g_assert(endptr == str + strlen(str));
 }
 
-static void test_qemu_strtoull_hex(void)
+static void test_qemu_strtou64_hex(void)
 {
     const char *str = "0123";
     char f = 'X';
@@ -1211,23 +1223,23 @@ static void test_qemu_strtoull_hex(void)
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, &endptr, 16, &res);
+    err = qemu_strtou64(str, &endptr, 16, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 0x123);
+    g_assert_cmphex(res, ==, 0x123);
     g_assert(endptr == str + strlen(str));
 
     str = "0x123";
     endptr = &f;
     res = 999;
-    err = qemu_strtoull(str, &endptr, 0, &res);
+    err = qemu_strtou64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 0x123);
+    g_assert_cmphex(res, ==, 0x123);
     g_assert(endptr == str + strlen(str));
 }
 
-static void test_qemu_strtoull_max(void)
+static void test_qemu_strtou64_max(void)
 {
     char *str = g_strdup_printf("%llu", ULLONG_MAX);
     char f = 'X';
@@ -1235,15 +1247,15 @@ static void test_qemu_strtoull_max(void)
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, &endptr, 0, &res);
+    err = qemu_strtou64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, ULLONG_MAX);
+    g_assert_cmphex(res, ==, ULLONG_MAX);
     g_assert(endptr == str + strlen(str));
     g_free(str);
 }
 
-static void test_qemu_strtoull_overflow(void)
+static void test_qemu_strtou64_overflow(void)
 {
     const char *str = "99999999999999999999999999999999999999999999";
     char f = 'X';
@@ -1251,14 +1263,14 @@ static void test_qemu_strtoull_overflow(void)
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, &endptr, 0, &res);
+    err = qemu_strtou64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -ERANGE);
-    g_assert_cmpint(res, ==, ULLONG_MAX);
+    g_assert_cmphex(res, ==, ULLONG_MAX);
     g_assert(endptr == str + strlen(str));
 }
 
-static void test_qemu_strtoull_underflow(void)
+static void test_qemu_strtou64_underflow(void)
 {
     const char *str = "-99999999999999999999999999999999999999999999";
     char f = 'X';
@@ -1266,14 +1278,14 @@ static void test_qemu_strtoull_underflow(void)
     uint64_t res = 999;
     int err;
 
-    err  = qemu_strtoull(str, &endptr, 0, &res);
+    err  = qemu_strtou64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, -ERANGE);
-    g_assert_cmpint(res, ==, -1);
+    g_assert_cmphex(res, ==, -1ull);
     g_assert(endptr == str + strlen(str));
 }
 
-static void test_qemu_strtoull_negative(void)
+static void test_qemu_strtou64_negative(void)
 {
     const char *str = "  \t -321";
     char f = 'X';
@@ -1281,94 +1293,139 @@ static void test_qemu_strtoull_negative(void)
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, &endptr, 0, &res);
+    err = qemu_strtou64(str, &endptr, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, -321);
+    g_assert_cmpuint(res, ==, -321ull);
     g_assert(endptr == str + strlen(str));
 }
 
-static void test_qemu_strtoull_full_correct(void)
+static void test_qemu_strtou64_full_correct(void)
 {
     const char *str = "18446744073709551614";
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, NULL, 0, &res);
+    err = qemu_strtou64(str, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 18446744073709551614LLU);
+    g_assert_cmpuint(res, ==, 18446744073709551614ull);
 }
 
-static void test_qemu_strtoull_full_null(void)
+static void test_qemu_strtou64_full_null(void)
 {
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(NULL, NULL, 0, &res);
+    err = qemu_strtou64(NULL, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
 }
 
-static void test_qemu_strtoull_full_empty(void)
+static void test_qemu_strtou64_full_empty(void)
 {
     const char *str = "";
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, NULL, 0, &res);
+    err = qemu_strtou64(str, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
 }
 
-static void test_qemu_strtoull_full_negative(void)
+static void test_qemu_strtou64_full_negative(void)
 {
     const char *str = " \t -321";
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, NULL, 0, &res);
+    err = qemu_strtou64(str, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, 18446744073709551295LLU);
+    g_assert_cmpuint(res, ==, -321ull);
 }
 
-static void test_qemu_strtoull_full_trailing(void)
+static void test_qemu_strtou64_full_trailing(void)
 {
     const char *str = "18446744073709551614xxxxxx";
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, NULL, 0, &res);
+    err = qemu_strtou64(str, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, -EINVAL);
 }
 
-static void test_qemu_strtoull_full_max(void)
+static void test_qemu_strtou64_full_max(void)
 {
     char *str = g_strdup_printf("%lld", ULLONG_MAX);
     uint64_t res = 999;
     int err;
 
-    err = qemu_strtoull(str, NULL, 0, &res);
+    err = qemu_strtou64(str, NULL, 0, &res);
 
     g_assert_cmpint(err, ==, 0);
-    g_assert_cmpint(res, ==, ULLONG_MAX);
+    g_assert_cmphex(res, ==, ULLONG_MAX);
     g_free(str);
 }
 
 static void test_qemu_strtosz_simple(void)
 {
-    const char *str = "12345M";
+    const char *str;
     char *endptr = NULL;
-    int64_t res;
+    int err;
+    uint64_t res = 0xbaadf00d;
 
-    res = qemu_strtosz(str, &endptr);
-    g_assert_cmpint(res, ==, 12345 * M_BYTE);
-    g_assert(endptr == str + 6);
+    str = "0";
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 0);
+    g_assert(endptr == str + 1);
+
+    str = "12345";
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 12345);
+    g_assert(endptr == str + 5);
+
+    err = qemu_strtosz(str, NULL, &res);
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 12345);
+
+    /* Note: precision is 53 bits since we're parsing with strtod() */
 
-    res = qemu_strtosz(str, NULL);
-    g_assert_cmpint(res, ==, 12345 * M_BYTE);
+    str = "9007199254740991"; /* 2^53-1 */
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 0x1fffffffffffff);
+    g_assert(endptr == str + 16);
+
+    str = "9007199254740992"; /* 2^53 */
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 0x20000000000000);
+    g_assert(endptr == str + 16);
+
+    str = "9007199254740993"; /* 2^53+1 */
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 0x20000000000000); /* rounded to 53 bits */
+    g_assert(endptr == str + 16);
+
+    str = "18446744073709549568"; /* 0xfffffffffffff800 (53 msbs set) */
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 0xfffffffffffff800);
+    g_assert(endptr == str + 20);
+
+    str = "18446744073709550591"; /* 0xfffffffffffffbff */
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 0xfffffffffffff800); /* rounded to 53 bits */
+    g_assert(endptr == str + 20);
+
+    /* 0x7ffffffffffffe00..0x7fffffffffffffff get rounded to
+     * 0x8000000000000000, thus -ERANGE; see test_qemu_strtosz_erange() */
 }
 
 static void test_qemu_strtosz_units(void)
@@ -1381,60 +1438,157 @@ static void test_qemu_strtosz_units(void)
     const char *t = "1T";
     const char *p = "1P";
     const char *e = "1E";
-    int64_t res;
+    int err;
+    char *endptr = NULL;
+    uint64_t res = 0xbaadf00d;
 
     /* default is M */
-    res = qemu_strtosz(none, NULL);
+    err = qemu_strtosz_MiB(none, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, M_BYTE);
+    g_assert(endptr == none + 1);
 
-    res = qemu_strtosz(b, NULL);
+    err = qemu_strtosz(b, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 1);
+    g_assert(endptr == b + 2);
 
-    res = qemu_strtosz(k, NULL);
+    err = qemu_strtosz(k, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, K_BYTE);
+    g_assert(endptr == k + 2);
 
-    res = qemu_strtosz(m, NULL);
+    err = qemu_strtosz(m, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, M_BYTE);
+    g_assert(endptr == m + 2);
 
-    res = qemu_strtosz(g, NULL);
+    err = qemu_strtosz(g, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, G_BYTE);
+    g_assert(endptr == g + 2);
 
-    res = qemu_strtosz(t, NULL);
+    err = qemu_strtosz(t, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, T_BYTE);
+    g_assert(endptr == t + 2);
 
-    res = qemu_strtosz(p, NULL);
+    err = qemu_strtosz(p, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, P_BYTE);
+    g_assert(endptr == p + 2);
 
-    res = qemu_strtosz(e, NULL);
+    err = qemu_strtosz(e, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, E_BYTE);
+    g_assert(endptr == e + 2);
 }
 
 static void test_qemu_strtosz_float(void)
 {
     const char *str = "12.345M";
-    int64_t res;
+    int err;
+    char *endptr = NULL;
+    uint64_t res = 0xbaadf00d;
 
-    res = qemu_strtosz(str, NULL);
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 12.345 * M_BYTE);
+    g_assert(endptr == str + 7);
+}
+
+static void test_qemu_strtosz_invalid(void)
+{
+    const char *str;
+    char *endptr = NULL;
+    int err;
+    uint64_t res = 0xbaadf00d;
+
+    str = "";
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
+
+    str = " \t ";
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
+
+    str = "crap";
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, -EINVAL);
+    g_assert(endptr == str);
+}
+
+static void test_qemu_strtosz_trailing(void)
+{
+    const char *str;
+    char *endptr = NULL;
+    int err;
+    uint64_t res = 0xbaadf00d;
+
+    str = "123xxx";
+    err = qemu_strtosz_MiB(str, &endptr, &res);
+    g_assert_cmpint(res, ==, 123 * M_BYTE);
+    g_assert(endptr == str + 3);
+
+    err = qemu_strtosz(str, NULL, &res);
+    g_assert_cmpint(err, ==, -EINVAL);
+
+    str = "1kiB";
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 1024);
+    g_assert(endptr == str + 2);
+
+    err = qemu_strtosz(str, NULL, &res);
+    g_assert_cmpint(err, ==, -EINVAL);
 }
 
 static void test_qemu_strtosz_erange(void)
 {
-    const char *str = "10E";
-    int64_t res;
+    const char *str;
+    char *endptr = NULL;
+    int err;
+    uint64_t res = 0xbaadf00d;
+
+    str = "-1";
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, -ERANGE);
+    g_assert(endptr == str + 2);
+
+    str = "18446744073709550592"; /* 0xfffffffffffffc00 */
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, -ERANGE);
+    g_assert(endptr == str + 20);
+
+    str = "18446744073709551615"; /* 2^64-1 */
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, -ERANGE);
+    g_assert(endptr == str + 20);
+
+    str = "18446744073709551616"; /* 2^64 */
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, -ERANGE);
+    g_assert(endptr == str + 20);
 
-    res = qemu_strtosz(str, NULL);
-    g_assert_cmpint(res, ==, -ERANGE);
+    str = "20E";
+    err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, -ERANGE);
+    g_assert(endptr == str + 3);
 }
 
-static void test_qemu_strtosz_suffix_unit(void)
+static void test_qemu_strtosz_metric(void)
 {
-    const char *str = "12345";
-    int64_t res;
+    const char *str = "12345k";
+    int err;
+    char *endptr = NULL;
+    uint64_t res = 0xbaadf00d;
 
-    res = qemu_strtosz_suffix_unit(str, NULL,
-                                   QEMU_STRTOSZ_DEFSUFFIX_KB, 1000);
+    err = qemu_strtosz_metric(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 12345000);
+    g_assert(endptr == str + 6);
 }
 
 int main(int argc, char **argv)
@@ -1459,21 +1613,32 @@ int main(int argc, char **argv)
                     test_parse_uint_full_correct);
 
     /* qemu_strtol() tests */
-    g_test_add_func("/cutils/qemu_strtol/correct", test_qemu_strtol_correct);
-    g_test_add_func("/cutils/qemu_strtol/null", test_qemu_strtol_null);
-    g_test_add_func("/cutils/qemu_strtol/empty", test_qemu_strtol_empty);
+    g_test_add_func("/cutils/qemu_strtol/correct",
+                    test_qemu_strtol_correct);
+    g_test_add_func("/cutils/qemu_strtol/null",
+                    test_qemu_strtol_null);
+    g_test_add_func("/cutils/qemu_strtol/empty",
+                    test_qemu_strtol_empty);
     g_test_add_func("/cutils/qemu_strtol/whitespace",
                     test_qemu_strtol_whitespace);
-    g_test_add_func("/cutils/qemu_strtol/invalid", test_qemu_strtol_invalid);
-    g_test_add_func("/cutils/qemu_strtol/trailing", test_qemu_strtol_trailing);
-    g_test_add_func("/cutils/qemu_strtol/octal", test_qemu_strtol_octal);
-    g_test_add_func("/cutils/qemu_strtol/decimal", test_qemu_strtol_decimal);
-    g_test_add_func("/cutils/qemu_strtol/hex", test_qemu_strtol_hex);
-    g_test_add_func("/cutils/qemu_strtol/max", test_qemu_strtol_max);
-    g_test_add_func("/cutils/qemu_strtol/overflow", test_qemu_strtol_overflow);
+    g_test_add_func("/cutils/qemu_strtol/invalid",
+                    test_qemu_strtol_invalid);
+    g_test_add_func("/cutils/qemu_strtol/trailing",
+                    test_qemu_strtol_trailing);
+    g_test_add_func("/cutils/qemu_strtol/octal",
+                    test_qemu_strtol_octal);
+    g_test_add_func("/cutils/qemu_strtol/decimal",
+                    test_qemu_strtol_decimal);
+    g_test_add_func("/cutils/qemu_strtol/hex",
+                    test_qemu_strtol_hex);
+    g_test_add_func("/cutils/qemu_strtol/max",
+                    test_qemu_strtol_max);
+    g_test_add_func("/cutils/qemu_strtol/overflow",
+                    test_qemu_strtol_overflow);
     g_test_add_func("/cutils/qemu_strtol/underflow",
                     test_qemu_strtol_underflow);
-    g_test_add_func("/cutils/qemu_strtol/negative", test_qemu_strtol_negative);
+    g_test_add_func("/cutils/qemu_strtol/negative",
+                    test_qemu_strtol_negative);
     g_test_add_func("/cutils/qemu_strtol_full/correct",
                     test_qemu_strtol_full_correct);
     g_test_add_func("/cutils/qemu_strtol_full/null",
@@ -1488,18 +1653,26 @@ int main(int argc, char **argv)
                     test_qemu_strtol_full_max);
 
     /* qemu_strtoul() tests */
-    g_test_add_func("/cutils/qemu_strtoul/correct", test_qemu_strtoul_correct);
-    g_test_add_func("/cutils/qemu_strtoul/null", test_qemu_strtoul_null);
-    g_test_add_func("/cutils/qemu_strtoul/empty", test_qemu_strtoul_empty);
+    g_test_add_func("/cutils/qemu_strtoul/correct",
+                    test_qemu_strtoul_correct);
+    g_test_add_func("/cutils/qemu_strtoul/null",
+                    test_qemu_strtoul_null);
+    g_test_add_func("/cutils/qemu_strtoul/empty",
+                    test_qemu_strtoul_empty);
     g_test_add_func("/cutils/qemu_strtoul/whitespace",
                     test_qemu_strtoul_whitespace);
-    g_test_add_func("/cutils/qemu_strtoul/invalid", test_qemu_strtoul_invalid);
+    g_test_add_func("/cutils/qemu_strtoul/invalid",
+                    test_qemu_strtoul_invalid);
     g_test_add_func("/cutils/qemu_strtoul/trailing",
                     test_qemu_strtoul_trailing);
-    g_test_add_func("/cutils/qemu_strtoul/octal", test_qemu_strtoul_octal);
-    g_test_add_func("/cutils/qemu_strtoul/decimal", test_qemu_strtoul_decimal);
-    g_test_add_func("/cutils/qemu_strtoul/hex", test_qemu_strtoul_hex);
-    g_test_add_func("/cutils/qemu_strtoul/max", test_qemu_strtoul_max);
+    g_test_add_func("/cutils/qemu_strtoul/octal",
+                    test_qemu_strtoul_octal);
+    g_test_add_func("/cutils/qemu_strtoul/decimal",
+                    test_qemu_strtoul_decimal);
+    g_test_add_func("/cutils/qemu_strtoul/hex",
+                    test_qemu_strtoul_hex);
+    g_test_add_func("/cutils/qemu_strtoul/max",
+                    test_qemu_strtoul_max);
     g_test_add_func("/cutils/qemu_strtoul/overflow",
                     test_qemu_strtoul_overflow);
     g_test_add_func("/cutils/qemu_strtoul/underflow",
@@ -1519,73 +1692,86 @@ int main(int argc, char **argv)
     g_test_add_func("/cutils/qemu_strtoul_full/max",
                     test_qemu_strtoul_full_max);
 
-    /* qemu_strtoll() tests */
-    g_test_add_func("/cutils/qemu_strtoll/correct", test_qemu_strtoll_correct);
-    g_test_add_func("/cutils/qemu_strtoll/null", test_qemu_strtoll_null);
-    g_test_add_func("/cutils/qemu_strtoll/empty", test_qemu_strtoll_empty);
-    g_test_add_func("/cutils/qemu_strtoll/whitespace",
-                    test_qemu_strtoll_whitespace);
-    g_test_add_func("/cutils/qemu_strtoll/invalid", test_qemu_strtoll_invalid);
-    g_test_add_func("/cutils/qemu_strtoll/trailing",
-                    test_qemu_strtoll_trailing);
-    g_test_add_func("/cutils/qemu_strtoll/octal", test_qemu_strtoll_octal);
-    g_test_add_func("/cutils/qemu_strtoll/decimal", test_qemu_strtoll_decimal);
-    g_test_add_func("/cutils/qemu_strtoll/hex", test_qemu_strtoll_hex);
-    g_test_add_func("/cutils/qemu_strtoll/max", test_qemu_strtoll_max);
-    g_test_add_func("/cutils/qemu_strtoll/overflow",
-                    test_qemu_strtoll_overflow);
-    g_test_add_func("/cutils/qemu_strtoll/underflow",
-                    test_qemu_strtoll_underflow);
-    g_test_add_func("/cutils/qemu_strtoll/negative",
-                    test_qemu_strtoll_negative);
-    g_test_add_func("/cutils/qemu_strtoll_full/correct",
-                    test_qemu_strtoll_full_correct);
-    g_test_add_func("/cutils/qemu_strtoll_full/null",
-                    test_qemu_strtoll_full_null);
-    g_test_add_func("/cutils/qemu_strtoll_full/empty",
-                    test_qemu_strtoll_full_empty);
-    g_test_add_func("/cutils/qemu_strtoll_full/negative",
-                    test_qemu_strtoll_full_negative);
-    g_test_add_func("/cutils/qemu_strtoll_full/trailing",
-                    test_qemu_strtoll_full_trailing);
-    g_test_add_func("/cutils/qemu_strtoll_full/max",
-                    test_qemu_strtoll_full_max);
-
-    /* qemu_strtoull() tests */
-    g_test_add_func("/cutils/qemu_strtoull/correct",
-                    test_qemu_strtoull_correct);
-    g_test_add_func("/cutils/qemu_strtoull/null",
-                    test_qemu_strtoull_null);
-    g_test_add_func("/cutils/qemu_strtoull/empty", test_qemu_strtoull_empty);
-    g_test_add_func("/cutils/qemu_strtoull/whitespace",
-                    test_qemu_strtoull_whitespace);
-    g_test_add_func("/cutils/qemu_strtoull/invalid",
-                    test_qemu_strtoull_invalid);
-    g_test_add_func("/cutils/qemu_strtoull/trailing",
-                    test_qemu_strtoull_trailing);
-    g_test_add_func("/cutils/qemu_strtoull/octal", test_qemu_strtoull_octal);
-    g_test_add_func("/cutils/qemu_strtoull/decimal",
-                    test_qemu_strtoull_decimal);
-    g_test_add_func("/cutils/qemu_strtoull/hex", test_qemu_strtoull_hex);
-    g_test_add_func("/cutils/qemu_strtoull/max", test_qemu_strtoull_max);
-    g_test_add_func("/cutils/qemu_strtoull/overflow",
-                    test_qemu_strtoull_overflow);
-    g_test_add_func("/cutils/qemu_strtoull/underflow",
-                    test_qemu_strtoull_underflow);
-    g_test_add_func("/cutils/qemu_strtoull/negative",
-                    test_qemu_strtoull_negative);
-    g_test_add_func("/cutils/qemu_strtoull_full/correct",
-                    test_qemu_strtoull_full_correct);
-    g_test_add_func("/cutils/qemu_strtoull_full/null",
-                    test_qemu_strtoull_full_null);
-    g_test_add_func("/cutils/qemu_strtoull_full/empty",
-                    test_qemu_strtoull_full_empty);
-    g_test_add_func("/cutils/qemu_strtoull_full/negative",
-                    test_qemu_strtoull_full_negative);
-    g_test_add_func("/cutils/qemu_strtoull_full/trailing",
-                    test_qemu_strtoull_full_trailing);
-    g_test_add_func("/cutils/qemu_strtoull_full/max",
-                    test_qemu_strtoull_full_max);
+    /* qemu_strtoi64() tests */
+    g_test_add_func("/cutils/qemu_strtoi64/correct",
+                    test_qemu_strtoi64_correct);
+    g_test_add_func("/cutils/qemu_strtoi64/null",
+                    test_qemu_strtoi64_null);
+    g_test_add_func("/cutils/qemu_strtoi64/empty",
+                    test_qemu_strtoi64_empty);
+    g_test_add_func("/cutils/qemu_strtoi64/whitespace",
+                    test_qemu_strtoi64_whitespace);
+    g_test_add_func("/cutils/qemu_strtoi64/invalid"
+                    ,
+                    test_qemu_strtoi64_invalid);
+    g_test_add_func("/cutils/qemu_strtoi64/trailing",
+                    test_qemu_strtoi64_trailing);
+    g_test_add_func("/cutils/qemu_strtoi64/octal",
+                    test_qemu_strtoi64_octal);
+    g_test_add_func("/cutils/qemu_strtoi64/decimal",
+                    test_qemu_strtoi64_decimal);
+    g_test_add_func("/cutils/qemu_strtoi64/hex",
+                    test_qemu_strtoi64_hex);
+    g_test_add_func("/cutils/qemu_strtoi64/max",
+                    test_qemu_strtoi64_max);
+    g_test_add_func("/cutils/qemu_strtoi64/overflow",
+                    test_qemu_strtoi64_overflow);
+    g_test_add_func("/cutils/qemu_strtoi64/underflow",
+                    test_qemu_strtoi64_underflow);
+    g_test_add_func("/cutils/qemu_strtoi64/negative",
+                    test_qemu_strtoi64_negative);
+    g_test_add_func("/cutils/qemu_strtoi64_full/correct",
+                    test_qemu_strtoi64_full_correct);
+    g_test_add_func("/cutils/qemu_strtoi64_full/null",
+                    test_qemu_strtoi64_full_null);
+    g_test_add_func("/cutils/qemu_strtoi64_full/empty",
+                    test_qemu_strtoi64_full_empty);
+    g_test_add_func("/cutils/qemu_strtoi64_full/negative",
+                    test_qemu_strtoi64_full_negative);
+    g_test_add_func("/cutils/qemu_strtoi64_full/trailing",
+                    test_qemu_strtoi64_full_trailing);
+    g_test_add_func("/cutils/qemu_strtoi64_full/max",
+                    test_qemu_strtoi64_full_max);
+
+    /* qemu_strtou64() tests */
+    g_test_add_func("/cutils/qemu_strtou64/correct",
+                    test_qemu_strtou64_correct);
+    g_test_add_func("/cutils/qemu_strtou64/null",
+                    test_qemu_strtou64_null);
+    g_test_add_func("/cutils/qemu_strtou64/empty",
+                    test_qemu_strtou64_empty);
+    g_test_add_func("/cutils/qemu_strtou64/whitespace",
+                    test_qemu_strtou64_whitespace);
+    g_test_add_func("/cutils/qemu_strtou64/invalid",
+                    test_qemu_strtou64_invalid);
+    g_test_add_func("/cutils/qemu_strtou64/trailing",
+                    test_qemu_strtou64_trailing);
+    g_test_add_func("/cutils/qemu_strtou64/octal",
+                    test_qemu_strtou64_octal);
+    g_test_add_func("/cutils/qemu_strtou64/decimal",
+                    test_qemu_strtou64_decimal);
+    g_test_add_func("/cutils/qemu_strtou64/hex",
+                    test_qemu_strtou64_hex);
+    g_test_add_func("/cutils/qemu_strtou64/max",
+                    test_qemu_strtou64_max);
+    g_test_add_func("/cutils/qemu_strtou64/overflow",
+                    test_qemu_strtou64_overflow);
+    g_test_add_func("/cutils/qemu_strtou64/underflow",
+                    test_qemu_strtou64_underflow);
+    g_test_add_func("/cutils/qemu_strtou64/negative",
+                    test_qemu_strtou64_negative);
+    g_test_add_func("/cutils/qemu_strtou64_full/correct",
+                    test_qemu_strtou64_full_correct);
+    g_test_add_func("/cutils/qemu_strtou64_full/null",
+                    test_qemu_strtou64_full_null);
+    g_test_add_func("/cutils/qemu_strtou64_full/empty",
+                    test_qemu_strtou64_full_empty);
+    g_test_add_func("/cutils/qemu_strtou64_full/negative",
+                    test_qemu_strtou64_full_negative);
+    g_test_add_func("/cutils/qemu_strtou64_full/trailing",
+                    test_qemu_strtou64_full_trailing);
+    g_test_add_func("/cutils/qemu_strtou64_full/max",
+                    test_qemu_strtou64_full_max);
 
     g_test_add_func("/cutils/strtosz/simple",
                     test_qemu_strtosz_simple);
@@ -1593,10 +1779,14 @@ int main(int argc, char **argv)
                     test_qemu_strtosz_units);
     g_test_add_func("/cutils/strtosz/float",
                     test_qemu_strtosz_float);
+    g_test_add_func("/cutils/strtosz/invalid",
+                    test_qemu_strtosz_invalid);
+    g_test_add_func("/cutils/strtosz/trailing",
+                    test_qemu_strtosz_trailing);
     g_test_add_func("/cutils/strtosz/erange",
                     test_qemu_strtosz_erange);
-    g_test_add_func("/cutils/strtosz/suffix-unit",
-                    test_qemu_strtosz_suffix_unit);
+    g_test_add_func("/cutils/strtosz/metric",
+                    test_qemu_strtosz_metric);
 
     return g_test_run();
 }
diff --git a/tests/test-qemu-opts.c b/tests/test-qemu-opts.c
index a505a3e059c043609b5bbefeb7643d0e8bf3b272..c46ef3165896f99df1a5d0d3c5f4c1dfba42c65b 100644
--- a/tests/test-qemu-opts.c
+++ b/tests/test-qemu-opts.c
@@ -8,6 +8,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/cutils.h"
 #include "qapi/error.h"
 #include "qapi/qmp/qstring.h"
 #include "qemu/config-file.h"
@@ -29,6 +30,9 @@ static QemuOptsList opts_list_01 = {
         },{
             .name = "number1",
             .type = QEMU_OPT_NUMBER,
+        },{
+            .name = "number2",
+            .type = QEMU_OPT_NUMBER,
         },
         { /* end of list */ }
     },
@@ -41,15 +45,24 @@ static QemuOptsList opts_list_02 = {
         {
             .name = "str1",
             .type = QEMU_OPT_STRING,
+        },{
+            .name = "str2",
+            .type = QEMU_OPT_STRING,
         },{
             .name = "bool1",
             .type = QEMU_OPT_BOOL,
         },{
-            .name = "str2",
-            .type = QEMU_OPT_STRING,
+            .name = "bool2",
+            .type = QEMU_OPT_BOOL,
         },{
             .name = "size1",
             .type = QEMU_OPT_SIZE,
+        },{
+            .name = "size2",
+            .type = QEMU_OPT_SIZE,
+        },{
+            .name = "size3",
+            .type = QEMU_OPT_SIZE,
         },
         { /* end of list */ }
     },
@@ -57,6 +70,7 @@ static QemuOptsList opts_list_02 = {
 
 static QemuOptsList opts_list_03 = {
     .name = "opts_list_03",
+    .implied_opt_name = "implied",
     .head = QTAILQ_HEAD_INITIALIZER(opts_list_03.head),
     .desc = {
         /* no elements => accept any params */
@@ -421,6 +435,308 @@ static void test_qemu_opts_set(void)
     g_assert(opts == NULL);
 }
 
+static int opts_count_iter(void *opaque, const char *name, const char *value,
+                           Error **errp)
+{
+    (*(size_t *)opaque)++;
+    return 0;
+}
+
+static size_t opts_count(QemuOpts *opts)
+{
+    size_t n = 0;
+
+    qemu_opt_foreach(opts, opts_count_iter, &n, NULL);
+    return n;
+}
+
+static void test_opts_parse(void)
+{
+    Error *err = NULL;
+    QemuOpts *opts;
+    char long_key[129];
+    char *params;
+
+    /* Nothing */
+    opts = qemu_opts_parse(&opts_list_03, "", false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 0);
+
+    /* Empty key */
+    opts = qemu_opts_parse(&opts_list_03, "=val", false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 1);
+    g_assert_cmpstr(qemu_opt_get(opts, ""), ==, "val");
+
+    /* Long key */
+    memset(long_key, 'a', 127);
+    long_key[127] = 'z';
+    long_key[128] = 0;
+    params = g_strdup_printf("%s=v", long_key);
+    opts = qemu_opts_parse(&opts_list_03, params + 1, NULL, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 1);
+    g_assert_cmpstr(qemu_opt_get(opts, long_key + 1), ==, "v");
+
+    /* Overlong key gets truncated */
+    opts = qemu_opts_parse(&opts_list_03, params, NULL, &error_abort);
+    g_assert(opts_count(opts) == 1);
+    long_key[127] = 0;
+    g_assert_cmpstr(qemu_opt_get(opts, long_key), ==, "v");
+    g_free(params);
+
+    /* Multiple keys, last one wins */
+    opts = qemu_opts_parse(&opts_list_03, "a=1,b=2,,x,a=3",
+                           false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 3);
+    g_assert_cmpstr(qemu_opt_get(opts, "a"), ==, "3");
+    g_assert_cmpstr(qemu_opt_get(opts, "b"), ==, "2,x");
+
+    /* Except when it doesn't */
+    opts = qemu_opts_parse(&opts_list_03, "id=foo,id=bar",
+                           false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 0);
+    g_assert_cmpstr(qemu_opts_id(opts), ==, "foo");
+
+    /* TODO Cover low-level access to repeated keys */
+
+    /* Trailing comma is ignored */
+    opts = qemu_opts_parse(&opts_list_03, "x=y,", false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 1);
+    g_assert_cmpstr(qemu_opt_get(opts, "x"), ==, "y");
+
+    /* Except when it isn't */
+    opts = qemu_opts_parse(&opts_list_03, ",", false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 1);
+    g_assert_cmpstr(qemu_opt_get(opts, ""), ==, "on");
+
+    /* Duplicate ID */
+    opts = qemu_opts_parse(&opts_list_03, "x=y,id=foo", false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+    /* TODO Cover .merge_lists = true */
+
+    /* Buggy ID recognition */
+    opts = qemu_opts_parse(&opts_list_03, "x=,,id=bar", false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 1);
+    g_assert_cmpstr(qemu_opts_id(opts), ==, "bar"); /* BUG */
+    g_assert_cmpstr(qemu_opt_get(opts, "x"), ==, ",id=bar");
+
+    /* Anti-social ID */
+    opts = qemu_opts_parse(&opts_list_01, "id=666", false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+
+    /* Implied value */
+    opts = qemu_opts_parse(&opts_list_03, "an,noaus,noaus=",
+                           false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 3);
+    g_assert_cmpstr(qemu_opt_get(opts, "an"), ==, "on");
+    g_assert_cmpstr(qemu_opt_get(opts, "aus"), ==, "off");
+    g_assert_cmpstr(qemu_opt_get(opts, "noaus"), ==, "");
+
+    /* Implied key */
+    opts = qemu_opts_parse(&opts_list_03, "an,noaus,noaus=", true,
+                           &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 3);
+    g_assert_cmpstr(qemu_opt_get(opts, "implied"), ==, "an");
+    g_assert_cmpstr(qemu_opt_get(opts, "aus"), ==, "off");
+    g_assert_cmpstr(qemu_opt_get(opts, "noaus"), ==, "");
+
+    /* Implied key with empty value */
+    opts = qemu_opts_parse(&opts_list_03, ",", true, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 1);
+    g_assert_cmpstr(qemu_opt_get(opts, "implied"), ==, "");
+
+    /* Implied key with comma value */
+    opts = qemu_opts_parse(&opts_list_03, ",,,a=1", true, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 2);
+    g_assert_cmpstr(qemu_opt_get(opts, "implied"), ==, ",");
+    g_assert_cmpstr(qemu_opt_get(opts, "a"), ==, "1");
+
+    /* Empty key is not an implied key */
+    opts = qemu_opts_parse(&opts_list_03, "=val", true, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 1);
+    g_assert_cmpstr(qemu_opt_get(opts, ""), ==, "val");
+
+    /* Unknown key */
+    opts = qemu_opts_parse(&opts_list_01, "nonexistent=", false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+
+    qemu_opts_reset(&opts_list_01);
+    qemu_opts_reset(&opts_list_03);
+}
+
+static void test_opts_parse_bool(void)
+{
+    Error *err = NULL;
+    QemuOpts *opts;
+
+    opts = qemu_opts_parse(&opts_list_02, "bool1=on,bool2=off",
+                           false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 2);
+    g_assert(qemu_opt_get_bool(opts, "bool1", false));
+    g_assert(!qemu_opt_get_bool(opts, "bool2", true));
+
+    opts = qemu_opts_parse(&opts_list_02, "bool1=offer", false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+
+    qemu_opts_reset(&opts_list_02);
+}
+
+static void test_opts_parse_number(void)
+{
+    Error *err = NULL;
+    QemuOpts *opts;
+
+    /* Lower limit zero */
+    opts = qemu_opts_parse(&opts_list_01, "number1=0", false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 1);
+    g_assert_cmpuint(qemu_opt_get_number(opts, "number1", 1), ==, 0);
+
+    /* Upper limit 2^64-1 */
+    opts = qemu_opts_parse(&opts_list_01,
+                           "number1=18446744073709551615,number2=-1",
+                           false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 2);
+    g_assert_cmphex(qemu_opt_get_number(opts, "number1", 1), ==, UINT64_MAX);
+    g_assert_cmphex(qemu_opt_get_number(opts, "number2", 0), ==, UINT64_MAX);
+
+    /* Above upper limit */
+    opts = qemu_opts_parse(&opts_list_01, "number1=18446744073709551616",
+                           false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+
+    /* Below lower limit */
+    opts = qemu_opts_parse(&opts_list_01, "number1=-18446744073709551616",
+                           false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+
+    /* Hex and octal */
+    opts = qemu_opts_parse(&opts_list_01, "number1=0x2a,number2=052",
+                           false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 2);
+    g_assert_cmpuint(qemu_opt_get_number(opts, "number1", 1), ==, 42);
+    g_assert_cmpuint(qemu_opt_get_number(opts, "number2", 0), ==, 42);
+
+    /* Invalid */
+    opts = qemu_opts_parse(&opts_list_01, "number1=", false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+    opts = qemu_opts_parse(&opts_list_01, "number1=eins", false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+
+    /* Leading whitespace */
+    opts = qemu_opts_parse(&opts_list_01, "number1= \t42",
+                           false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 1);
+    g_assert_cmpuint(qemu_opt_get_number(opts, "number1", 1), ==, 42);
+
+    /* Trailing crap */
+    opts = qemu_opts_parse(&opts_list_01, "number1=3.14", false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+    opts = qemu_opts_parse(&opts_list_01, "number1=08", false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+    opts = qemu_opts_parse(&opts_list_01, "number1=0 ", false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+
+    qemu_opts_reset(&opts_list_01);
+}
+
+static void test_opts_parse_size(void)
+{
+    Error *err = NULL;
+    QemuOpts *opts;
+
+    /* Lower limit zero */
+    opts = qemu_opts_parse(&opts_list_02, "size1=0", false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 1);
+    g_assert_cmpuint(qemu_opt_get_size(opts, "size1", 1), ==, 0);
+
+    /* Note: precision is 53 bits since we're parsing with strtod() */
+
+    /* Around limit of precision: 2^53-1, 2^53, 2^54 */
+    opts = qemu_opts_parse(&opts_list_02,
+                           "size1=9007199254740991,"
+                           "size2=9007199254740992,"
+                           "size3=9007199254740993",
+                           false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 3);
+    g_assert_cmphex(qemu_opt_get_size(opts, "size1", 1),
+                     ==, 0x1fffffffffffff);
+    g_assert_cmphex(qemu_opt_get_size(opts, "size2", 1),
+                     ==, 0x20000000000000);
+    g_assert_cmphex(qemu_opt_get_size(opts, "size3", 1),
+                     ==, 0x20000000000000);
+
+    /* Close to signed upper limit 0x7ffffffffffffc00 (53 msbs set) */
+    opts = qemu_opts_parse(&opts_list_02,
+                           "size1=9223372036854774784," /* 7ffffffffffffc00 */
+                           "size2=9223372036854775295", /* 7ffffffffffffdff */
+                           false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 2);
+    g_assert_cmphex(qemu_opt_get_size(opts, "size1", 1),
+                     ==, 0x7ffffffffffffc00);
+    g_assert_cmphex(qemu_opt_get_size(opts, "size2", 1),
+                     ==, 0x7ffffffffffffc00);
+
+    /* Close to actual upper limit 0xfffffffffffff800 (53 msbs set) */
+    opts = qemu_opts_parse(&opts_list_02,
+                           "size1=18446744073709549568," /* fffffffffffff800 */
+                           "size2=18446744073709550591", /* fffffffffffffbff */
+                           false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 2);
+    g_assert_cmphex(qemu_opt_get_size(opts, "size1", 1),
+                     ==, 0xfffffffffffff800);
+    g_assert_cmphex(qemu_opt_get_size(opts, "size2", 1),
+                     ==, 0xfffffffffffff800);
+
+    /* Beyond limits */
+    opts = qemu_opts_parse(&opts_list_02, "size1=-1", false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+    opts = qemu_opts_parse(&opts_list_02,
+                           "size1=18446744073709550592", /* fffffffffffffc00 */
+                           false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+
+    /* Suffixes */
+    opts = qemu_opts_parse(&opts_list_02, "size1=8b,size2=1.5k,size3=2M",
+                           false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 3);
+    g_assert_cmphex(qemu_opt_get_size(opts, "size1", 0), ==, 8);
+    g_assert_cmphex(qemu_opt_get_size(opts, "size2", 0), ==, 1536);
+    g_assert_cmphex(qemu_opt_get_size(opts, "size3", 0), ==, 2 * M_BYTE);
+    opts = qemu_opts_parse(&opts_list_02, "size1=0.1G,size2=16777215T",
+                           false, &error_abort);
+    g_assert_cmpuint(opts_count(opts), ==, 2);
+    g_assert_cmphex(qemu_opt_get_size(opts, "size1", 0), ==, G_BYTE / 10);
+    g_assert_cmphex(qemu_opt_get_size(opts, "size2", 0),
+                     ==, 16777215 * T_BYTE);
+
+    /* Beyond limit with suffix */
+    opts = qemu_opts_parse(&opts_list_02, "size1=16777216T",
+                           false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+
+    /* Trailing crap */
+    opts = qemu_opts_parse(&opts_list_02, "size1=16E", false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+    opts = qemu_opts_parse(&opts_list_02, "size1=16Gi", false, &err);
+    error_free_or_abort(&err);
+    g_assert(!opts);
+
+    qemu_opts_reset(&opts_list_02);
+}
+
 int main(int argc, char *argv[])
 {
     register_opts();
@@ -435,6 +751,10 @@ int main(int argc, char *argv[])
     g_test_add_func("/qemu-opts/opt_unset", test_qemu_opt_unset);
     g_test_add_func("/qemu-opts/opts_reset", test_qemu_opts_reset);
     g_test_add_func("/qemu-opts/opts_set", test_qemu_opts_set);
+    g_test_add_func("/qemu-opts/opts_parse/general", test_opts_parse);
+    g_test_add_func("/qemu-opts/opts_parse/bool", test_opts_parse_bool);
+    g_test_add_func("/qemu-opts/opts_parse/number", test_opts_parse_number);
+    g_test_add_func("/qemu-opts/opts_parse/size", test_opts_parse_size);
     g_test_run();
     return 0;
 }
diff --git a/util/cutils.c b/util/cutils.c
index 4fefcf3be31ee6ac7077f069c4e7b7b66383172b..50ad179dc57eff5dea0e50a6fa61899f95298134 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -181,19 +181,19 @@ int fcntl_setfl(int fd, int flag)
 static int64_t suffix_mul(char suffix, int64_t unit)
 {
     switch (qemu_toupper(suffix)) {
-    case QEMU_STRTOSZ_DEFSUFFIX_B:
+    case 'B':
         return 1;
-    case QEMU_STRTOSZ_DEFSUFFIX_KB:
+    case 'K':
         return unit;
-    case QEMU_STRTOSZ_DEFSUFFIX_MB:
+    case 'M':
         return unit * unit;
-    case QEMU_STRTOSZ_DEFSUFFIX_GB:
+    case 'G':
         return unit * unit * unit;
-    case QEMU_STRTOSZ_DEFSUFFIX_TB:
+    case 'T':
         return unit * unit * unit * unit;
-    case QEMU_STRTOSZ_DEFSUFFIX_PB:
+    case 'P':
         return unit * unit * unit * unit * unit;
-    case QEMU_STRTOSZ_DEFSUFFIX_EB:
+    case 'E':
         return unit * unit * unit * unit * unit * unit;
     }
     return -1;
@@ -205,10 +205,11 @@ static int64_t suffix_mul(char suffix, int64_t unit)
  * in *end, if not NULL. Return -ERANGE on overflow, Return -EINVAL on
  * other error.
  */
-int64_t qemu_strtosz_suffix_unit(const char *nptr, char **end,
-                            const char default_suffix, int64_t unit)
+static int do_strtosz(const char *nptr, char **end,
+                      const char default_suffix, int64_t unit,
+                      uint64_t *result)
 {
-    int64_t retval = -EINVAL;
+    int retval;
     char *endptr;
     unsigned char c;
     int mul_required = 0;
@@ -217,7 +218,8 @@ int64_t qemu_strtosz_suffix_unit(const char *nptr, char **end,
     errno = 0;
     val = strtod(nptr, &endptr);
     if (isnan(val) || endptr == nptr || errno != 0) {
-        goto fail;
+        retval = -EINVAL;
+        goto out;
     }
     fraction = modf(val, &integral);
     if (fraction != 0) {
@@ -232,181 +234,204 @@ int64_t qemu_strtosz_suffix_unit(const char *nptr, char **end,
         assert(mul >= 0);
     }
     if (mul == 1 && mul_required) {
-        goto fail;
+        retval = -EINVAL;
+        goto out;
     }
-    if ((val * mul >= INT64_MAX) || val < 0) {
+    /*
+     * Values >= 0xfffffffffffffc00 overflow uint64_t after their trip
+     * through double (53 bits of precision).
+     */
+    if ((val * mul >= 0xfffffffffffffc00) || val < 0) {
         retval = -ERANGE;
-        goto fail;
+        goto out;
     }
-    retval = val * mul;
+    *result = val * mul;
+    retval = 0;
 
-fail:
+out:
     if (end) {
         *end = endptr;
+    } else if (*endptr) {
+        retval = -EINVAL;
     }
 
     return retval;
 }
 
-int64_t qemu_strtosz_suffix(const char *nptr, char **end,
-                            const char default_suffix)
+int qemu_strtosz(const char *nptr, char **end, uint64_t *result)
+{
+    return do_strtosz(nptr, end, 'B', 1024, result);
+}
+
+int qemu_strtosz_MiB(const char *nptr, char **end, uint64_t *result)
 {
-    return qemu_strtosz_suffix_unit(nptr, end, default_suffix, 1024);
+    return do_strtosz(nptr, end, 'M', 1024, result);
 }
 
-int64_t qemu_strtosz(const char *nptr, char **end)
+int qemu_strtosz_metric(const char *nptr, char **end, uint64_t *result)
 {
-    return qemu_strtosz_suffix(nptr, end, QEMU_STRTOSZ_DEFSUFFIX_MB);
+    return do_strtosz(nptr, end, 'B', 1000, result);
 }
 
 /**
- * Helper function for qemu_strto*l() functions.
+ * Helper function for error checking after strtol() and the like
  */
-static int check_strtox_error(const char *p, char *endptr, const char **next,
-                              int err)
+static int check_strtox_error(const char *nptr, char *ep,
+                              const char **endptr, int libc_errno)
 {
-    /* If no conversion was performed, prefer BSD behavior over glibc
-     * behavior.
-     */
-    if (err == 0 && endptr == p) {
-        err = EINVAL;
+    if (endptr) {
+        *endptr = ep;
     }
-    if (!next && *endptr) {
+
+    /* Turn "no conversion" into an error */
+    if (libc_errno == 0 && ep == nptr) {
         return -EINVAL;
     }
-    if (next) {
-        *next = endptr;
+
+    /* Fail when we're expected to consume the string, but didn't */
+    if (!endptr && *ep) {
+        return -EINVAL;
     }
-    return -err;
+
+    return -libc_errno;
 }
 
 /**
- * QEMU wrappers for strtol(), strtoll(), strtoul(), strotull() C functions.
- *
- * Convert ASCII string @nptr to a long integer value
- * from the given @base. Parameters @nptr, @endptr, @base
- * follows same semantics as strtol() C function.
- *
- * Unlike from strtol() function, if @endptr is not NULL, this
- * function will return -EINVAL whenever it cannot fully convert
- * the string in @nptr with given @base to a long. This function returns
- * the result of the conversion only through the @result parameter.
- *
- * If NULL is passed in @endptr, then the whole string in @ntpr
- * is a number otherwise it returns -EINVAL.
- *
- * RETURN VALUE
- * Unlike from strtol() function, this wrapper returns either
- * -EINVAL or the errno set by strtol() function (e.g -ERANGE).
- * If the conversion overflows, -ERANGE is returned, and @result
- * is set to the max value of the desired type
- * (e.g. LONG_MAX, LLONG_MAX, ULONG_MAX, ULLONG_MAX). If the case
- * of underflow, -ERANGE is returned, and @result is set to the min
- * value of the desired type. For strtol(), strtoll(), @result is set to
- * LONG_MIN, LLONG_MIN, respectively, and for strtoul(), strtoull() it
- * is set to 0.
+ * Convert string @nptr to a long integer, and store it in @result.
+ *
+ * This is a wrapper around strtol() that is harder to misuse.
+ * Semantics of @nptr, @endptr, @base match strtol() with differences
+ * noted below.
+ *
+ * @nptr may be null, and no conversion is performed then.
+ *
+ * If no conversion is performed, store @nptr in *@endptr and return
+ * -EINVAL.
+ *
+ * If @endptr is null, and the string isn't fully converted, return
+ * -EINVAL.  This is the case when the pointer that would be stored in
+ * a non-null @endptr points to a character other than '\0'.
+ *
+ * If the conversion overflows @result, store LONG_MAX in @result,
+ * and return -ERANGE.
+ *
+ * If the conversion underflows @result, store LONG_MIN in @result,
+ * and return -ERANGE.
+ *
+ * Else store the converted value in @result, and return zero.
  */
 int qemu_strtol(const char *nptr, const char **endptr, int base,
                 long *result)
 {
-    char *p;
-    int err = 0;
+    char *ep;
+
     if (!nptr) {
         if (endptr) {
             *endptr = nptr;
         }
-        err = -EINVAL;
-    } else {
-        errno = 0;
-        *result = strtol(nptr, &p, base);
-        err = check_strtox_error(nptr, p, endptr, errno);
+        return -EINVAL;
     }
-    return err;
+
+    errno = 0;
+    *result = strtol(nptr, &ep, base);
+    return check_strtox_error(nptr, ep, endptr, errno);
 }
 
 /**
- * Converts ASCII string to an unsigned long integer.
+ * Convert string @nptr to an unsigned long, and store it in @result.
+ *
+ * This is a wrapper around strtoul() that is harder to misuse.
+ * Semantics of @nptr, @endptr, @base match strtoul() with differences
+ * noted below.
+ *
+ * @nptr may be null, and no conversion is performed then.
  *
- * If string contains a negative number, value will be converted to
- * the unsigned representation of the signed value, unless the original
- * (nonnegated) value would overflow, in this case, it will set @result
- * to ULONG_MAX, and return ERANGE.
+ * If no conversion is performed, store @nptr in *@endptr and return
+ * -EINVAL.
  *
- * The same behavior holds, for qemu_strtoull() but sets @result to
- * ULLONG_MAX instead of ULONG_MAX.
+ * If @endptr is null, and the string isn't fully converted, return
+ * -EINVAL.  This is the case when the pointer that would be stored in
+ * a non-null @endptr points to a character other than '\0'.
  *
- * See qemu_strtol() documentation for more info.
+ * If the conversion overflows @result, store ULONG_MAX in @result,
+ * and return -ERANGE.
+ *
+ * Else store the converted value in @result, and return zero.
+ *
+ * Note that a number with a leading minus sign gets converted without
+ * the minus sign, checked for overflow (see above), then negated (in
+ * @result's type).  This is exactly how strtoul() works.
  */
 int qemu_strtoul(const char *nptr, const char **endptr, int base,
                  unsigned long *result)
 {
-    char *p;
-    int err = 0;
+    char *ep;
+
     if (!nptr) {
         if (endptr) {
             *endptr = nptr;
         }
-        err = -EINVAL;
-    } else {
-        errno = 0;
-        *result = strtoul(nptr, &p, base);
-        /* Windows returns 1 for negative out-of-range values.  */
-        if (errno == ERANGE) {
-            *result = -1;
-        }
-        err = check_strtox_error(nptr, p, endptr, errno);
+        return -EINVAL;
+    }
+
+    errno = 0;
+    *result = strtoul(nptr, &ep, base);
+    /* Windows returns 1 for negative out-of-range values.  */
+    if (errno == ERANGE) {
+        *result = -1;
     }
-    return err;
+    return check_strtox_error(nptr, ep, endptr, errno);
 }
 
 /**
- * Converts ASCII string to a long long integer.
+ * Convert string @nptr to an int64_t.
  *
- * See qemu_strtol() documentation for more info.
+ * Works like qemu_strtol(), except it stores INT64_MAX on overflow,
+ * and INT_MIN on underflow.
  */
-int qemu_strtoll(const char *nptr, const char **endptr, int base,
+int qemu_strtoi64(const char *nptr, const char **endptr, int base,
                  int64_t *result)
 {
-    char *p;
-    int err = 0;
+    char *ep;
+
     if (!nptr) {
         if (endptr) {
             *endptr = nptr;
         }
-        err = -EINVAL;
-    } else {
-        errno = 0;
-        *result = strtoll(nptr, &p, base);
-        err = check_strtox_error(nptr, p, endptr, errno);
+        return -EINVAL;
     }
-    return err;
+
+    errno = 0;
+    /* FIXME This assumes int64_t is long long */
+    *result = strtoll(nptr, &ep, base);
+    return check_strtox_error(nptr, ep, endptr, errno);
 }
 
 /**
- * Converts ASCII string to an unsigned long long integer.
+ * Convert string @nptr to an uint64_t.
  *
- * See qemu_strtol() documentation for more info.
+ * Works like qemu_strtoul(), except it stores UINT64_MAX on overflow.
  */
-int qemu_strtoull(const char *nptr, const char **endptr, int base,
+int qemu_strtou64(const char *nptr, const char **endptr, int base,
                   uint64_t *result)
 {
-    char *p;
-    int err = 0;
+    char *ep;
+
     if (!nptr) {
         if (endptr) {
             *endptr = nptr;
         }
-        err = -EINVAL;
-    } else {
-        errno = 0;
-        *result = strtoull(nptr, &p, base);
-        /* Windows returns 1 for negative out-of-range values.  */
-        if (errno == ERANGE) {
-            *result = -1;
-        }
-        err = check_strtox_error(nptr, p, endptr, errno);
+        return -EINVAL;
+    }
+
+    errno = 0;
+    /* FIXME This assumes uint64_t is unsigned long long */
+    *result = strtoull(nptr, &ep, base);
+    /* Windows returns 1 for negative out-of-range values.  */
+    if (errno == ERANGE) {
+        *result = -1;
     }
-    return err;
+    return check_strtox_error(nptr, ep, endptr, errno);
 }
 
 /**
diff --git a/util/log.c b/util/log.c
index e077340ae16fa999b79681948d098156228eac17..96f30dd21a4a095485b519e2adc7c45f7c52c1d0 100644
--- a/util/log.c
+++ b/util/log.c
@@ -183,13 +183,13 @@ void qemu_set_dfilter_ranges(const char *filter_spec, Error **errp)
             goto out;
         }
 
-        if (qemu_strtoull(r, &e, 0, &r1val)
+        if (qemu_strtou64(r, &e, 0, &r1val)
             || e != range_op) {
             error_setg(errp, "Invalid number to the left of %.*s",
                        (int)(r2 - range_op), range_op);
             goto out;
         }
-        if (qemu_strtoull(r2, NULL, 0, &r2val)) {
+        if (qemu_strtou64(r2, NULL, 0, &r2val)) {
             error_setg(errp, "Invalid number to the right of %.*s",
                        (int)(r2 - range_op), range_op);
             goto out;
diff --git a/util/qemu-option.c b/util/qemu-option.c
index d611946333dae80b74b1adf1a044892d4d88f9fb..419f2528b8bcdceab48331cd14a37b0fa40703f1 100644
--- a/util/qemu-option.c
+++ b/util/qemu-option.c
@@ -128,36 +128,33 @@ int get_param_value(char *buf, int buf_size,
 static void parse_option_bool(const char *name, const char *value, bool *ret,
                               Error **errp)
 {
-    if (value != NULL) {
-        if (!strcmp(value, "on")) {
-            *ret = 1;
-        } else if (!strcmp(value, "off")) {
-            *ret = 0;
-        } else {
-            error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
-                       name, "'on' or 'off'");
-        }
-    } else {
+    if (!strcmp(value, "on")) {
         *ret = 1;
+    } else if (!strcmp(value, "off")) {
+        *ret = 0;
+    } else {
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
+                   name, "'on' or 'off'");
     }
 }
 
 static void parse_option_number(const char *name, const char *value,
                                 uint64_t *ret, Error **errp)
 {
-    char *postfix;
     uint64_t number;
+    int err;
 
-    if (value != NULL) {
-        number = strtoull(value, &postfix, 0);
-        if (*postfix != '\0') {
-            error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
-            return;
-        }
-        *ret = number;
-    } else {
+    err = qemu_strtou64(value, NULL, 0, &number);
+    if (err == -ERANGE) {
+        error_setg(errp, "Value '%s' is too large for parameter '%s'",
+                   value, name);
+        return;
+    }
+    if (err) {
         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
+        return;
     }
+    *ret = number;
 }
 
 static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
@@ -177,43 +174,24 @@ static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
 void parse_option_size(const char *name, const char *value,
                        uint64_t *ret, Error **errp)
 {
-    char *postfix;
-    double sizef;
-
-    if (value != NULL) {
-        sizef = strtod(value, &postfix);
-        if (sizef < 0 || sizef > UINT64_MAX) {
-            error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name,
-                             "a non-negative number below 2^64");
-            return;
-        }
-        switch (*postfix) {
-        case 'T':
-            sizef *= 1024;
-            /* fall through */
-        case 'G':
-            sizef *= 1024;
-            /* fall through */
-        case 'M':
-            sizef *= 1024;
-            /* fall through */
-        case 'K':
-        case 'k':
-            sizef *= 1024;
-            /* fall through */
-        case 'b':
-        case '\0':
-            *ret = (uint64_t) sizef;
-            break;
-        default:
-            error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
-            error_append_hint(errp, "You may use k, M, G or T suffixes for "
-                    "kilobytes, megabytes, gigabytes and terabytes.\n");
-            return;
-        }
-    } else {
-        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
+    uint64_t size;
+    int err;
+
+    err = qemu_strtosz(value, NULL, &size);
+    if (err == -ERANGE) {
+        error_setg(errp, "Value '%s' is too large for parameter '%s'",
+                   value, name);
+        return;
+    }
+    if (err) {
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name,
+                   "a non-negative number below 2^64");
+        error_append_hint(errp, "Optional suffix k, M, G, T, P or E means"
+                          " kilo-, mega-, giga-, tera-, peta-\n"
+                          "and exabytes, respectively.\n");
+        return;
     }
+    *ret = size;
 }
 
 bool has_help_option(const char *param)
@@ -566,6 +544,7 @@ static void opt_set(QemuOpts *opts, const char *name, const char *value,
     }
     opt->desc = desc;
     opt->str = g_strdup(value);
+    assert(opt->str);
     qemu_opt_parse(opt, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);