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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
/*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#include "cache.h"
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#include "diff.h"
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#include "diffcore.h"
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static char **order;
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static int order_cnt;
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static void prepare_order(const char *orderfile)
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{
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int fd, cnt, pass;
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void *map;
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char *cp, *endp;
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struct stat st;
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size_t sz;
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if (order)
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return;
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fd = open(orderfile, O_RDONLY);
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if (fd < 0)
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return;
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if (fstat(fd, &st)) {
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close(fd);
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return;
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}
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sz = xsize_t(st.st_size);
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map = mmap(NULL, sz, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
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close(fd);
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if (map == MAP_FAILED)
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return;
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endp = (char *) map + sz;
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for (pass = 0; pass < 2; pass++) {
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cnt = 0;
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cp = map;
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while (cp < endp) {
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char *ep;
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for (ep = cp; ep < endp && *ep != '\n'; ep++)
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;
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/* cp to ep has one line */
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if (*cp == '\n' || *cp == '#')
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; /* comment */
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else if (pass == 0)
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cnt++;
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else {
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if (*ep == '\n') {
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*ep = 0;
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order[cnt] = cp;
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}
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else {
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order[cnt] = xmalloc(ep-cp+1);
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memcpy(order[cnt], cp, ep-cp);
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order[cnt][ep-cp] = 0;
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}
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cnt++;
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}
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if (ep < endp)
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ep++;
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cp = ep;
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}
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if (pass == 0) {
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order_cnt = cnt;
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order = xmalloc(sizeof(*order) * cnt);
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}
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}
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}
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struct pair_order {
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struct diff_filepair *pair;
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int orig_order;
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int order;
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};
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static int match_order(const char *path)
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{
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int i;
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char p[PATH_MAX];
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for (i = 0; i < order_cnt; i++) {
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strcpy(p, path);
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while (p[0]) {
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char *cp;
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if (!fnmatch(order[i], p, 0))
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return i;
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cp = strrchr(p, '/');
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if (!cp)
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break;
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*cp = 0;
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}
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}
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return order_cnt;
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}
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static int compare_pair_order(const void *a_, const void *b_)
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{
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struct pair_order const *a, *b;
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a = (struct pair_order const *)a_;
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b = (struct pair_order const *)b_;
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if (a->order != b->order)
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return a->order - b->order;
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return a->orig_order - b->orig_order;
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}
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void diffcore_order(const char *orderfile)
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{
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struct diff_queue_struct *q = &diff_queued_diff;
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struct pair_order *o;
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int i;
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if (!q->nr)
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return;
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o = xmalloc(sizeof(*o) * q->nr);
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prepare_order(orderfile);
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for (i = 0; i < q->nr; i++) {
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o[i].pair = q->queue[i];
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o[i].orig_order = i;
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o[i].order = match_order(o[i].pair->two->path);
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}
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qsort(o, q->nr, sizeof(*o), compare_pair_order);
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for (i = 0; i < q->nr; i++)
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q->queue[i] = o[i].pair;
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free(o);
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return;
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}
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