mirror of
https://github.com/git/git.git
synced 2024-11-24 18:33:43 +08:00
dc49cd769b
Some systems have sizeof(off_t) == 8 while sizeof(size_t) == 4. This implies that we are able to access and work on files whose maximum length is around 2^63-1 bytes, but we can only malloc or mmap somewhat less than 2^32-1 bytes of memory. On such a system an implicit conversion of off_t to size_t can cause the size_t to wrap, resulting in unexpected and exciting behavior. Right now we are working around all gcc warnings generated by the -Wshorten-64-to-32 option by passing the off_t through xsize_t(). In the future we should make xsize_t on such problematic platforms detect the wrapping and die if such a file is accessed. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
128 lines
2.2 KiB
C
128 lines
2.2 KiB
C
/*
|
|
* Copyright (C) 2005 Junio C Hamano
|
|
*/
|
|
#include "cache.h"
|
|
#include "diff.h"
|
|
#include "diffcore.h"
|
|
|
|
static char **order;
|
|
static int order_cnt;
|
|
|
|
static void prepare_order(const char *orderfile)
|
|
{
|
|
int fd, cnt, pass;
|
|
void *map;
|
|
char *cp, *endp;
|
|
struct stat st;
|
|
size_t sz;
|
|
|
|
if (order)
|
|
return;
|
|
|
|
fd = open(orderfile, O_RDONLY);
|
|
if (fd < 0)
|
|
return;
|
|
if (fstat(fd, &st)) {
|
|
close(fd);
|
|
return;
|
|
}
|
|
sz = xsize_t(st.st_size);
|
|
map = mmap(NULL, sz, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
|
|
close(fd);
|
|
if (map == MAP_FAILED)
|
|
return;
|
|
endp = (char *) map + sz;
|
|
for (pass = 0; pass < 2; pass++) {
|
|
cnt = 0;
|
|
cp = map;
|
|
while (cp < endp) {
|
|
char *ep;
|
|
for (ep = cp; ep < endp && *ep != '\n'; ep++)
|
|
;
|
|
/* cp to ep has one line */
|
|
if (*cp == '\n' || *cp == '#')
|
|
; /* comment */
|
|
else if (pass == 0)
|
|
cnt++;
|
|
else {
|
|
if (*ep == '\n') {
|
|
*ep = 0;
|
|
order[cnt] = cp;
|
|
}
|
|
else {
|
|
order[cnt] = xmalloc(ep-cp+1);
|
|
memcpy(order[cnt], cp, ep-cp);
|
|
order[cnt][ep-cp] = 0;
|
|
}
|
|
cnt++;
|
|
}
|
|
if (ep < endp)
|
|
ep++;
|
|
cp = ep;
|
|
}
|
|
if (pass == 0) {
|
|
order_cnt = cnt;
|
|
order = xmalloc(sizeof(*order) * cnt);
|
|
}
|
|
}
|
|
}
|
|
|
|
struct pair_order {
|
|
struct diff_filepair *pair;
|
|
int orig_order;
|
|
int order;
|
|
};
|
|
|
|
static int match_order(const char *path)
|
|
{
|
|
int i;
|
|
char p[PATH_MAX];
|
|
|
|
for (i = 0; i < order_cnt; i++) {
|
|
strcpy(p, path);
|
|
while (p[0]) {
|
|
char *cp;
|
|
if (!fnmatch(order[i], p, 0))
|
|
return i;
|
|
cp = strrchr(p, '/');
|
|
if (!cp)
|
|
break;
|
|
*cp = 0;
|
|
}
|
|
}
|
|
return order_cnt;
|
|
}
|
|
|
|
static int compare_pair_order(const void *a_, const void *b_)
|
|
{
|
|
struct pair_order const *a, *b;
|
|
a = (struct pair_order const *)a_;
|
|
b = (struct pair_order const *)b_;
|
|
if (a->order != b->order)
|
|
return a->order - b->order;
|
|
return a->orig_order - b->orig_order;
|
|
}
|
|
|
|
void diffcore_order(const char *orderfile)
|
|
{
|
|
struct diff_queue_struct *q = &diff_queued_diff;
|
|
struct pair_order *o;
|
|
int i;
|
|
|
|
if (!q->nr)
|
|
return;
|
|
|
|
o = xmalloc(sizeof(*o) * q->nr);
|
|
prepare_order(orderfile);
|
|
for (i = 0; i < q->nr; i++) {
|
|
o[i].pair = q->queue[i];
|
|
o[i].orig_order = i;
|
|
o[i].order = match_order(o[i].pair->two->path);
|
|
}
|
|
qsort(o, q->nr, sizeof(*o), compare_pair_order);
|
|
for (i = 0; i < q->nr; i++)
|
|
q->queue[i] = o[i].pair;
|
|
free(o);
|
|
return;
|
|
}
|