fc2b621454
Some buffers created with PATH_MAX length are not checked when being written, and can overflow if PATH_MAX is not big enough to hold the path. Replace those buffers by strbufs so that their size is automatically grown if necessary. They are created as static local variables to avoid reallocating memory on each call. Note that prefix_filename() returns this static buffer so each callers should copy or use the string immediately (this is currently true). Reported-by: Wataru Noguchi <wnoguchi.0727@gmail.com> Signed-off-by: Antoine Pelisse <apelisse@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
126 lines
2.2 KiB
C
126 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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} else {
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order[cnt] = xmemdupz(cp, ep - cp);
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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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static struct strbuf p = STRBUF_INIT;
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for (i = 0; i < order_cnt; i++) {
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strbuf_reset(&p);
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strbuf_addstr(&p, path);
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while (p.buf[0]) {
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char *cp;
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if (!fnmatch(order[i], p.buf, 0))
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return i;
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cp = strrchr(p.buf, '/');
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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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