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-rw-r--r--util/cutils.c203
1 files changed, 163 insertions, 40 deletions
diff --git a/util/cutils.c b/util/cutils.c
index 5d1c9ebe05..cfeb848d19 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -145,11 +145,6 @@ time_t mktimegm(struct tm *tm)
return t;
}
-int qemu_fls(int i)
-{
- return 32 - clz32(i);
-}
-
/*
* Make sure data goes on disk, but if possible do not bother to
* write out the inode just for timestamp updates.
@@ -281,19 +276,19 @@ int fcntl_setfl(int fd, int flag)
static int64_t suffix_mul(char suffix, int64_t unit)
{
switch (qemu_toupper(suffix)) {
- case STRTOSZ_DEFSUFFIX_B:
+ case QEMU_STRTOSZ_DEFSUFFIX_B:
return 1;
- case STRTOSZ_DEFSUFFIX_KB:
+ case QEMU_STRTOSZ_DEFSUFFIX_KB:
return unit;
- case STRTOSZ_DEFSUFFIX_MB:
+ case QEMU_STRTOSZ_DEFSUFFIX_MB:
return unit * unit;
- case STRTOSZ_DEFSUFFIX_GB:
+ case QEMU_STRTOSZ_DEFSUFFIX_GB:
return unit * unit * unit;
- case STRTOSZ_DEFSUFFIX_TB:
+ case QEMU_STRTOSZ_DEFSUFFIX_TB:
return unit * unit * unit * unit;
- case STRTOSZ_DEFSUFFIX_PB:
+ case QEMU_STRTOSZ_DEFSUFFIX_PB:
return unit * unit * unit * unit * unit;
- case STRTOSZ_DEFSUFFIX_EB:
+ case QEMU_STRTOSZ_DEFSUFFIX_EB:
return unit * unit * unit * unit * unit * unit;
}
return -1;
@@ -305,7 +300,7 @@ 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 strtosz_suffix_unit(const char *nptr, char **end,
+int64_t qemu_strtosz_suffix_unit(const char *nptr, char **end,
const char default_suffix, int64_t unit)
{
int64_t retval = -EINVAL;
@@ -348,14 +343,165 @@ fail:
return retval;
}
-int64_t strtosz_suffix(const char *nptr, char **end, const char default_suffix)
+int64_t qemu_strtosz_suffix(const char *nptr, char **end,
+ const char default_suffix)
{
- return strtosz_suffix_unit(nptr, end, default_suffix, 1024);
+ return qemu_strtosz_suffix_unit(nptr, end, default_suffix, 1024);
}
-int64_t strtosz(const char *nptr, char **end)
+int64_t qemu_strtosz(const char *nptr, char **end)
+{
+ return qemu_strtosz_suffix(nptr, end, QEMU_STRTOSZ_DEFSUFFIX_MB);
+}
+
+/**
+ * Helper function for qemu_strto*l() functions.
+ */
+static int check_strtox_error(const char *p, char *endptr, const char **next,
+ int err)
+{
+ /* If no conversion was performed, prefer BSD behavior over glibc
+ * behavior.
+ */
+ if (err == 0 && endptr == p) {
+ err = EINVAL;
+ }
+ if (!next && *endptr) {
+ return -EINVAL;
+ }
+ if (next) {
+ *next = endptr;
+ }
+ return -err;
+}
+
+/**
+ * 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.
+ */
+int qemu_strtol(const char *nptr, const char **endptr, int base,
+ long *result)
{
- return strtosz_suffix(nptr, end, STRTOSZ_DEFSUFFIX_MB);
+ char *p;
+ int err = 0;
+ 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 err;
+}
+
+/**
+ * Converts ASCII string to an unsigned long integer.
+ *
+ * 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.
+ *
+ * The same behavior holds, for qemu_strtoull() but sets @result to
+ * ULLONG_MAX instead of ULONG_MAX.
+ *
+ * See qemu_strtol() documentation for more info.
+ */
+int qemu_strtoul(const char *nptr, const char **endptr, int base,
+ unsigned long *result)
+{
+ char *p;
+ int err = 0;
+ 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 err;
+}
+
+/**
+ * Converts ASCII string to a long long integer.
+ *
+ * See qemu_strtol() documentation for more info.
+ */
+int qemu_strtoll(const char *nptr, const char **endptr, int base,
+ int64_t *result)
+{
+ char *p;
+ int err = 0;
+ 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 err;
+}
+
+/**
+ * Converts ASCII string to an unsigned long long integer.
+ *
+ * See qemu_strtol() documentation for more info.
+ */
+int qemu_strtoull(const char *nptr, const char **endptr, int base,
+ uint64_t *result)
+{
+ char *p;
+ int err = 0;
+ 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 err;
}
/**
@@ -474,29 +620,6 @@ int qemu_parse_fd(const char *param)
return fd;
}
-/* round down to the nearest power of 2*/
-int64_t pow2floor(int64_t value)
-{
- if (!is_power_of_2(value)) {
- value = 0x8000000000000000ULL >> clz64(value);
- }
- return value;
-}
-
-/* round up to the nearest power of 2 (0 if overflow) */
-uint64_t pow2ceil(uint64_t value)
-{
- uint8_t nlz = clz64(value);
-
- if (is_power_of_2(value)) {
- return value;
- }
- if (!nlz) {
- return 0;
- }
- return 1ULL << (64 - nlz);
-}
-
/*
* Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128)
* Input is limited to 14-bit numbers
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-26 15:49:36 +0000