+static int64_t suffix_mul(char suffix, int64_t unit)
+{
+ switch (qemu_toupper(suffix)) {
+ case STRTOSZ_DEFSUFFIX_B:
+ return 1;
+ case STRTOSZ_DEFSUFFIX_KB:
+ return unit;
+ case STRTOSZ_DEFSUFFIX_MB:
+ return unit * unit;
+ case STRTOSZ_DEFSUFFIX_GB:
+ return unit * unit * unit;
+ case STRTOSZ_DEFSUFFIX_TB:
+ return unit * unit * unit * unit;
+ }
+ return -1;
+}
+
+/*
+ * Convert string to bytes, allowing either B/b for bytes, K/k for KB,
+ * M/m for MB, G/g for GB or T/t for TB. End pointer will be returned
+ * in *end, if not NULL. Return -1 on error.
+ */
+int64_t strtosz_suffix_unit(const char *nptr, char **end,
+ const char default_suffix, int64_t unit)
+{
+ int64_t retval = -1;
+ char *endptr;
+ unsigned char c;
+ int mul_required = 0;
+ double val, mul, integral, fraction;
+
+ errno = 0;
+ val = strtod(nptr, &endptr);
+ if (isnan(val) || endptr == nptr || errno != 0) {
+ goto fail;
+ }
+ fraction = modf(val, &integral);
+ if (fraction != 0) {
+ mul_required = 1;
+ }
+ c = *endptr;
+ mul = suffix_mul(c, unit);
+ if (mul >= 0) {
+ endptr++;
+ } else {
+ mul = suffix_mul(default_suffix, unit);
+ assert(mul >= 0);
+ }
+ if (mul == 1 && mul_required) {
+ goto fail;
+ }
+ if ((val * mul >= INT64_MAX) || val < 0) {
+ goto fail;
+ }
+ retval = val * mul;
+
+fail:
+ if (end) {
+ *end = endptr;
+ }
+
+ return retval;
+}
+
+int64_t strtosz_suffix(const char *nptr, char **end, const char default_suffix)
+{
+ return strtosz_suffix_unit(nptr, end, default_suffix, 1024);
+}
+
+int64_t strtosz(const char *nptr, char **end)
+{
+ return strtosz_suffix(nptr, end, STRTOSZ_DEFSUFFIX_MB);
+}
+
+int qemu_parse_fd(const char *param)
+{
+ int fd;
+ char *endptr = NULL;
+
+ fd = strtol(param, &endptr, 10);
+ if (*endptr || (fd == 0 && param == endptr)) {
+ return -1;
+ }
+ return fd;
+}