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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>
126 lines
2.6 KiB
C
126 lines
2.6 KiB
C
#include "cache.h"
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#include "xdiff-interface.h"
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static int parse_num(char **cp_p, int *num_p)
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{
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char *cp = *cp_p;
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int num = 0;
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int read_some;
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while ('0' <= *cp && *cp <= '9')
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num = num * 10 + *cp++ - '0';
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if (!(read_some = cp - *cp_p))
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return -1;
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*cp_p = cp;
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*num_p = num;
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return 0;
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}
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int parse_hunk_header(char *line, int len,
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int *ob, int *on,
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int *nb, int *nn)
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{
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char *cp;
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cp = line + 4;
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if (parse_num(&cp, ob)) {
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bad_line:
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return error("malformed diff output: %s", line);
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}
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if (*cp == ',') {
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cp++;
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if (parse_num(&cp, on))
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goto bad_line;
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}
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else
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*on = 1;
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if (*cp++ != ' ' || *cp++ != '+')
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goto bad_line;
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if (parse_num(&cp, nb))
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goto bad_line;
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if (*cp == ',') {
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cp++;
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if (parse_num(&cp, nn))
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goto bad_line;
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}
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else
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*nn = 1;
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return -!!memcmp(cp, " @@", 3);
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}
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static void consume_one(void *priv_, char *s, unsigned long size)
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{
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struct xdiff_emit_state *priv = priv_;
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char *ep;
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while (size) {
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unsigned long this_size;
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ep = memchr(s, '\n', size);
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this_size = (ep == NULL) ? size : (ep - s + 1);
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priv->consume(priv, s, this_size);
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size -= this_size;
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s += this_size;
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}
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}
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int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf)
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{
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struct xdiff_emit_state *priv = priv_;
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int i;
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for (i = 0; i < nbuf; i++) {
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if (mb[i].ptr[mb[i].size-1] != '\n') {
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/* Incomplete line */
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priv->remainder = xrealloc(priv->remainder,
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priv->remainder_size +
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mb[i].size);
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memcpy(priv->remainder + priv->remainder_size,
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mb[i].ptr, mb[i].size);
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priv->remainder_size += mb[i].size;
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continue;
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}
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/* we have a complete line */
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if (!priv->remainder) {
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consume_one(priv, mb[i].ptr, mb[i].size);
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continue;
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}
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priv->remainder = xrealloc(priv->remainder,
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priv->remainder_size +
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mb[i].size);
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memcpy(priv->remainder + priv->remainder_size,
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mb[i].ptr, mb[i].size);
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consume_one(priv, priv->remainder,
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priv->remainder_size + mb[i].size);
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free(priv->remainder);
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priv->remainder = NULL;
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priv->remainder_size = 0;
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}
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if (priv->remainder) {
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consume_one(priv, priv->remainder, priv->remainder_size);
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free(priv->remainder);
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priv->remainder = NULL;
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priv->remainder_size = 0;
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}
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return 0;
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}
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int read_mmfile(mmfile_t *ptr, const char *filename)
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{
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struct stat st;
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FILE *f;
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size_t sz;
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if (stat(filename, &st))
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return error("Could not stat %s", filename);
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if ((f = fopen(filename, "rb")) == NULL)
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return error("Could not open %s", filename);
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sz = xsize_t(st.st_size);
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ptr->ptr = xmalloc(sz);
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if (fread(ptr->ptr, sz, 1, f) != 1)
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return error("Could not read %s", filename);
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fclose(f);
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ptr->size = sz;
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return 0;
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}
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