mirror of
https://github.com/git/git.git
synced 2024-11-18 06:54:55 +01:00
4050c0df8e
This attempts to clean up the way various compatibility functions are defined and used. - A new header file, git-compat-util.h, is introduced. This looks at various NO_XXX and does necessary function name replacements, equivalent of -Dstrcasestr=gitstrcasestr in the Makefile. - Those function name replacements are removed from the Makefile. - Common features such as usage(), die(), xmalloc() are moved from cache.h to git-compat-util.h; cache.h includes git-compat-util.h itself. Signed-off-by: Junio C Hamano <junkio@cox.net>
50 lines
804 B
C
50 lines
804 B
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include "../git-compat-util.h"
|
|
|
|
void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset)
|
|
{
|
|
int n = 0;
|
|
|
|
if (start != NULL || !(flags & MAP_PRIVATE))
|
|
die("Invalid usage of gitfakemmap.");
|
|
|
|
if (lseek(fd, offset, SEEK_SET) < 0) {
|
|
errno = EINVAL;
|
|
return MAP_FAILED;
|
|
}
|
|
|
|
start = xmalloc(length);
|
|
if (start == NULL) {
|
|
errno = ENOMEM;
|
|
return MAP_FAILED;
|
|
}
|
|
|
|
while (n < length) {
|
|
int count = read(fd, start+n, length-n);
|
|
|
|
if (count == 0) {
|
|
memset(start+n, 0, length-n);
|
|
break;
|
|
}
|
|
|
|
if (count < 0) {
|
|
free(start);
|
|
errno = EACCES;
|
|
return MAP_FAILED;
|
|
}
|
|
|
|
n += count;
|
|
}
|
|
|
|
return start;
|
|
}
|
|
|
|
int gitfakemunmap(void *start, size_t length)
|
|
{
|
|
free(start);
|
|
return 0;
|
|
}
|
|
|