* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
+#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/host-utils.h"
#include <math.h>
-#include <limits.h>
-#include <errno.h>
#include "qemu/sockets.h"
#include "qemu/iov.h"
#include "net/net.h"
+#include "qemu/cutils.h"
void strpadcpy(char *buf, int buf_size, const char *str, char pad)
{
#endif
}
-/*
- * Searches for an area with non-zero content in a buffer
- *
- * Attention! The len must be a multiple of
- * BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR * sizeof(VECTYPE)
- * and addr must be a multiple of sizeof(VECTYPE) due to
- * restriction of optimizations in this function.
- *
- * can_use_buffer_find_nonzero_offset() can be used to check
- * these requirements.
- *
- * The return value is the offset of the non-zero area rounded
- * down to a multiple of sizeof(VECTYPE) for the first
- * BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR chunks and down to
- * BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR * sizeof(VECTYPE)
- * afterwards.
- *
- * If the buffer is all zero the return value is equal to len.
- */
-
-size_t buffer_find_nonzero_offset(const void *buf, size_t len)
-{
- const VECTYPE *p = buf;
- const VECTYPE zero = (VECTYPE){0};
- size_t i;
-
- assert(can_use_buffer_find_nonzero_offset(buf, len));
-
- if (!len) {
- return 0;
- }
-
- for (i = 0; i < BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR; i++) {
- if (!ALL_EQ(p[i], zero)) {
- return i * sizeof(VECTYPE);
- }
- }
-
- for (i = BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR;
- i < len / sizeof(VECTYPE);
- i += BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR) {
- VECTYPE tmp0 = VEC_OR(p[i + 0], p[i + 1]);
- VECTYPE tmp1 = VEC_OR(p[i + 2], p[i + 3]);
- VECTYPE tmp2 = VEC_OR(p[i + 4], p[i + 5]);
- VECTYPE tmp3 = VEC_OR(p[i + 6], p[i + 7]);
- VECTYPE tmp01 = VEC_OR(tmp0, tmp1);
- VECTYPE tmp23 = VEC_OR(tmp2, tmp3);
- if (!ALL_EQ(VEC_OR(tmp01, tmp23), zero)) {
- break;
- }
- }
-
- return i * sizeof(VECTYPE);
-}
-
-/*
- * Checks if a buffer is all zeroes
- *
- * Attention! The len must be a multiple of 4 * sizeof(long) due to
- * restriction of optimizations in this function.
- */
-bool buffer_is_zero(const void *buf, size_t len)
-{
- /*
- * Use long as the biggest available internal data type that fits into the
- * CPU register and unroll the loop to smooth out the effect of memory
- * latency.
- */
-
- size_t i;
- long d0, d1, d2, d3;
- const long * const data = buf;
-
- /* use vector optimized zero check if possible */
- if (can_use_buffer_find_nonzero_offset(buf, len)) {
- return buffer_find_nonzero_offset(buf, len) == len;
- }
-
- assert(len % (4 * sizeof(long)) == 0);
- len /= sizeof(long);
-
- for (i = 0; i < len; i += 4) {
- d0 = data[i + 0];
- d1 = data[i + 1];
- d2 = data[i + 2];
- d3 = data[i + 3];
-
- if (d0 || d1 || d2 || d3) {
- return false;
- }
- }
-
- return true;
-}
-
#ifndef _WIN32
/* Sets a specific flag */
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 'B':
return 1;
- case STRTOSZ_DEFSUFFIX_KB:
+ case 'K':
return unit;
- case STRTOSZ_DEFSUFFIX_MB:
+ case 'M':
return unit * unit;
- case STRTOSZ_DEFSUFFIX_GB:
+ case 'G':
return unit * unit * unit;
- case STRTOSZ_DEFSUFFIX_TB:
+ case 'T':
return unit * unit * unit * unit;
- case STRTOSZ_DEFSUFFIX_PB:
+ case 'P':
return unit * unit * unit * unit * unit;
- case STRTOSZ_DEFSUFFIX_EB:
+ case 'E':
return unit * unit * unit * unit * unit * unit;
}
return -1;
* in *end, if not NULL. Return -ERANGE on overflow, Return -EINVAL on
* other error.
*/
-int64_t 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;
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) {
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 strtosz_suffix(const char *nptr, char **end, const char default_suffix)
+int qemu_strtosz(const char *nptr, char **end, uint64_t *result)
{
- return strtosz_suffix_unit(nptr, end, default_suffix, 1024);
+ return do_strtosz(nptr, end, 'B', 1024, result);
}
-int64_t strtosz(const char *nptr, char **end)
+int qemu_strtosz_MiB(const char *nptr, char **end, uint64_t *result)
{
- return strtosz_suffix(nptr, end, STRTOSZ_DEFSUFFIX_MB);
+ return do_strtosz(nptr, end, 'M', 1024, result);
+}
+
+int qemu_strtosz_metric(const char *nptr, char **end, uint64_t *result)
+{
+ 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;
}
- return err;
+
+ errno = 0;
+ *result = strtoul(nptr, &ep, base);
+ /* Windows returns 1 for negative out-of-range values. */
+ if (errno == ERANGE) {
+ *result = -1;
+ }
+ 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);
}
/**
projects / mirror_qemu.git / blobdiff