254 lines
5.9 KiB
C
254 lines
5.9 KiB
C
/*
|
|
* Simple C functions to supplement the C library
|
|
*
|
|
* Copyright (c) 2006 Fabrice Bellard
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
#include "qemu-common.h"
|
|
#include "host-utils.h"
|
|
|
|
void pstrcpy(char *buf, int buf_size, const char *str)
|
|
{
|
|
int c;
|
|
char *q = buf;
|
|
|
|
if (buf_size <= 0)
|
|
return;
|
|
|
|
for(;;) {
|
|
c = *str++;
|
|
if (c == 0 || q >= buf + buf_size - 1)
|
|
break;
|
|
*q++ = c;
|
|
}
|
|
*q = '\0';
|
|
}
|
|
|
|
/* strcat and truncate. */
|
|
char *pstrcat(char *buf, int buf_size, const char *s)
|
|
{
|
|
int len;
|
|
len = strlen(buf);
|
|
if (len < buf_size)
|
|
pstrcpy(buf + len, buf_size - len, s);
|
|
return buf;
|
|
}
|
|
|
|
int strstart(const char *str, const char *val, const char **ptr)
|
|
{
|
|
const char *p, *q;
|
|
p = str;
|
|
q = val;
|
|
while (*q != '\0') {
|
|
if (*p != *q)
|
|
return 0;
|
|
p++;
|
|
q++;
|
|
}
|
|
if (ptr)
|
|
*ptr = p;
|
|
return 1;
|
|
}
|
|
|
|
int stristart(const char *str, const char *val, const char **ptr)
|
|
{
|
|
const char *p, *q;
|
|
p = str;
|
|
q = val;
|
|
while (*q != '\0') {
|
|
if (qemu_toupper(*p) != qemu_toupper(*q))
|
|
return 0;
|
|
p++;
|
|
q++;
|
|
}
|
|
if (ptr)
|
|
*ptr = p;
|
|
return 1;
|
|
}
|
|
|
|
/* XXX: use host strnlen if available ? */
|
|
int qemu_strnlen(const char *s, int max_len)
|
|
{
|
|
int i;
|
|
|
|
for(i = 0; i < max_len; i++) {
|
|
if (s[i] == '\0') {
|
|
break;
|
|
}
|
|
}
|
|
return i;
|
|
}
|
|
|
|
time_t mktimegm(struct tm *tm)
|
|
{
|
|
time_t t;
|
|
int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;
|
|
if (m < 3) {
|
|
m += 12;
|
|
y--;
|
|
}
|
|
t = 86400 * (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 +
|
|
y / 400 - 719469);
|
|
t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
|
|
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.
|
|
*
|
|
* Unfortunately even in 2009 many operating systems do not support
|
|
* fdatasync and have to fall back to fsync.
|
|
*/
|
|
int qemu_fdatasync(int fd)
|
|
{
|
|
#ifdef CONFIG_FDATASYNC
|
|
return fdatasync(fd);
|
|
#else
|
|
return fsync(fd);
|
|
#endif
|
|
}
|
|
|
|
/* io vectors */
|
|
|
|
void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint)
|
|
{
|
|
qiov->iov = qemu_malloc(alloc_hint * sizeof(struct iovec));
|
|
qiov->niov = 0;
|
|
qiov->nalloc = alloc_hint;
|
|
qiov->size = 0;
|
|
}
|
|
|
|
void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov)
|
|
{
|
|
int i;
|
|
|
|
qiov->iov = iov;
|
|
qiov->niov = niov;
|
|
qiov->nalloc = -1;
|
|
qiov->size = 0;
|
|
for (i = 0; i < niov; i++)
|
|
qiov->size += iov[i].iov_len;
|
|
}
|
|
|
|
void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len)
|
|
{
|
|
assert(qiov->nalloc != -1);
|
|
|
|
if (qiov->niov == qiov->nalloc) {
|
|
qiov->nalloc = 2 * qiov->nalloc + 1;
|
|
qiov->iov = qemu_realloc(qiov->iov, qiov->nalloc * sizeof(struct iovec));
|
|
}
|
|
qiov->iov[qiov->niov].iov_base = base;
|
|
qiov->iov[qiov->niov].iov_len = len;
|
|
qiov->size += len;
|
|
++qiov->niov;
|
|
}
|
|
|
|
/*
|
|
* Copies iovecs from src to the end dst until src is completely copied or the
|
|
* total size of the copied iovec reaches size. The size of the last copied
|
|
* iovec is changed in order to fit the specified total size if it isn't a
|
|
* perfect fit already.
|
|
*/
|
|
void qemu_iovec_concat(QEMUIOVector *dst, QEMUIOVector *src, size_t size)
|
|
{
|
|
int i;
|
|
size_t done;
|
|
|
|
assert(dst->nalloc != -1);
|
|
|
|
done = 0;
|
|
for (i = 0; (i < src->niov) && (done != size); i++) {
|
|
if (done + src->iov[i].iov_len > size) {
|
|
qemu_iovec_add(dst, src->iov[i].iov_base, size - done);
|
|
break;
|
|
} else {
|
|
qemu_iovec_add(dst, src->iov[i].iov_base, src->iov[i].iov_len);
|
|
}
|
|
done += src->iov[i].iov_len;
|
|
}
|
|
}
|
|
|
|
void qemu_iovec_destroy(QEMUIOVector *qiov)
|
|
{
|
|
assert(qiov->nalloc != -1);
|
|
|
|
qemu_free(qiov->iov);
|
|
}
|
|
|
|
void qemu_iovec_reset(QEMUIOVector *qiov)
|
|
{
|
|
assert(qiov->nalloc != -1);
|
|
|
|
qiov->niov = 0;
|
|
qiov->size = 0;
|
|
}
|
|
|
|
void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf)
|
|
{
|
|
uint8_t *p = (uint8_t *)buf;
|
|
int i;
|
|
|
|
for (i = 0; i < qiov->niov; ++i) {
|
|
memcpy(p, qiov->iov[i].iov_base, qiov->iov[i].iov_len);
|
|
p += qiov->iov[i].iov_len;
|
|
}
|
|
}
|
|
|
|
void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count)
|
|
{
|
|
const uint8_t *p = (const uint8_t *)buf;
|
|
size_t copy;
|
|
int i;
|
|
|
|
for (i = 0; i < qiov->niov && count; ++i) {
|
|
copy = count;
|
|
if (copy > qiov->iov[i].iov_len)
|
|
copy = qiov->iov[i].iov_len;
|
|
memcpy(qiov->iov[i].iov_base, p, copy);
|
|
p += copy;
|
|
count -= copy;
|
|
}
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
/* Sets a specific flag */
|
|
int fcntl_setfl(int fd, int flag)
|
|
{
|
|
int flags;
|
|
|
|
flags = fcntl(fd, F_GETFL);
|
|
if (flags == -1)
|
|
return -errno;
|
|
|
|
if (fcntl(fd, F_SETFL, flags | flag) == -1)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|