mirror of
https://github.com/git/git.git
synced 2024-11-28 20:44:04 +08:00
040a655116
The "x"-prefixed versions of strdup, malloc, etc. will check whether the allocation was successful and terminate the process otherwise. A few uses of malloc were left alone since they already implemented a graceful path of failure or were in a quasi external library like xdiff. Additionally, the call to malloc in compat/win32/syslog.c was not modified since the syslog() implemented there is a die handler and a call to the x-wrappers within a die handler could result in recursion should memory allocation fail. This will have to be addressed separately. Signed-off-by: Brandon Casey <drafnel@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
63 lines
1.1 KiB
C
63 lines
1.1 KiB
C
#include "../git-compat-util.h"
|
|
|
|
/*
|
|
* A merge sort implementation, simplified from the qsort implementation
|
|
* by Mike Haertel, which is a part of the GNU C Library.
|
|
*/
|
|
|
|
static void msort_with_tmp(void *b, size_t n, size_t s,
|
|
int (*cmp)(const void *, const void *),
|
|
char *t)
|
|
{
|
|
char *tmp;
|
|
char *b1, *b2;
|
|
size_t n1, n2;
|
|
|
|
if (n <= 1)
|
|
return;
|
|
|
|
n1 = n / 2;
|
|
n2 = n - n1;
|
|
b1 = b;
|
|
b2 = (char *)b + (n1 * s);
|
|
|
|
msort_with_tmp(b1, n1, s, cmp, t);
|
|
msort_with_tmp(b2, n2, s, cmp, t);
|
|
|
|
tmp = t;
|
|
|
|
while (n1 > 0 && n2 > 0) {
|
|
if (cmp(b1, b2) <= 0) {
|
|
memcpy(tmp, b1, s);
|
|
tmp += s;
|
|
b1 += s;
|
|
--n1;
|
|
} else {
|
|
memcpy(tmp, b2, s);
|
|
tmp += s;
|
|
b2 += s;
|
|
--n2;
|
|
}
|
|
}
|
|
if (n1 > 0)
|
|
memcpy(tmp, b1, n1 * s);
|
|
memcpy(b, t, (n - n2) * s);
|
|
}
|
|
|
|
void git_qsort(void *b, size_t n, size_t s,
|
|
int (*cmp)(const void *, const void *))
|
|
{
|
|
const size_t size = n * s;
|
|
char buf[1024];
|
|
|
|
if (size < sizeof(buf)) {
|
|
/* The temporary array fits on the small on-stack buffer. */
|
|
msort_with_tmp(b, n, s, cmp, buf);
|
|
} else {
|
|
/* It's somewhat large, so malloc it. */
|
|
char *tmp = xmalloc(size);
|
|
msort_with_tmp(b, n, s, cmp, tmp);
|
|
free(tmp);
|
|
}
|
|
}
|