tvl-depot/third_party/git/compat/mmap.c
Vincent Ambo 7ef0d62730 merge(third_party/git): Merge squashed git subtree at v2.23.0
Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'
2020-01-11 23:40:29 +00:00

40 lines
711 B
C

#include "../git-compat-util.h"
void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
{
size_t n = 0;
if (start != NULL || flags != MAP_PRIVATE || prot != PROT_READ)
die("Invalid usage of mmap when built with NO_MMAP");
start = xmalloc(length);
if (start == NULL) {
errno = ENOMEM;
return MAP_FAILED;
}
while (n < length) {
ssize_t count = xpread(fd, (char *)start + n, length - n, offset + n);
if (count == 0) {
memset((char *)start+n, 0, length-n);
break;
}
if (count < 0) {
free(start);
errno = EACCES;
return MAP_FAILED;
}
n += count;
}
return start;
}
int git_munmap(void *start, size_t length)
{
free(start);
return 0;
}