* 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)
{
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.
#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 = p[i + 0] | p[i + 1];
- VECTYPE tmp1 = p[i + 2] | p[i + 3];
- VECTYPE tmp2 = p[i + 4] | p[i + 5];
- VECTYPE tmp3 = p[i + 6] | p[i + 7];
- VECTYPE tmp01 = tmp0 | tmp1;
- VECTYPE tmp23 = tmp2 | tmp3;
- if (!ALL_EQ(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 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;
* 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;
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 strtosz_suffix(nptr, end, STRTOSZ_DEFSUFFIX_MB);
+ 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)
+{
+ 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;
}
/**
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
projects / qemu.git / blobdiff