mirror of
https://github.com/git/git.git
synced 2024-11-30 21:44:02 +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>
126 lines
2.6 KiB
C
126 lines
2.6 KiB
C
#include "cache.h"
|
|
#include "xdiff-interface.h"
|
|
|
|
static int parse_num(char **cp_p, int *num_p)
|
|
{
|
|
char *cp = *cp_p;
|
|
int num = 0;
|
|
int read_some;
|
|
|
|
while ('0' <= *cp && *cp <= '9')
|
|
num = num * 10 + *cp++ - '0';
|
|
if (!(read_some = cp - *cp_p))
|
|
return -1;
|
|
*cp_p = cp;
|
|
*num_p = num;
|
|
return 0;
|
|
}
|
|
|
|
int parse_hunk_header(char *line, int len,
|
|
int *ob, int *on,
|
|
int *nb, int *nn)
|
|
{
|
|
char *cp;
|
|
cp = line + 4;
|
|
if (parse_num(&cp, ob)) {
|
|
bad_line:
|
|
return error("malformed diff output: %s", line);
|
|
}
|
|
if (*cp == ',') {
|
|
cp++;
|
|
if (parse_num(&cp, on))
|
|
goto bad_line;
|
|
}
|
|
else
|
|
*on = 1;
|
|
if (*cp++ != ' ' || *cp++ != '+')
|
|
goto bad_line;
|
|
if (parse_num(&cp, nb))
|
|
goto bad_line;
|
|
if (*cp == ',') {
|
|
cp++;
|
|
if (parse_num(&cp, nn))
|
|
goto bad_line;
|
|
}
|
|
else
|
|
*nn = 1;
|
|
return -!!memcmp(cp, " @@", 3);
|
|
}
|
|
|
|
static void consume_one(void *priv_, char *s, unsigned long size)
|
|
{
|
|
struct xdiff_emit_state *priv = priv_;
|
|
char *ep;
|
|
while (size) {
|
|
unsigned long this_size;
|
|
ep = memchr(s, '\n', size);
|
|
this_size = (ep == NULL) ? size : (ep - s + 1);
|
|
priv->consume(priv, s, this_size);
|
|
size -= this_size;
|
|
s += this_size;
|
|
}
|
|
}
|
|
|
|
int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf)
|
|
{
|
|
struct xdiff_emit_state *priv = priv_;
|
|
int i;
|
|
|
|
for (i = 0; i < nbuf; i++) {
|
|
if (mb[i].ptr[mb[i].size-1] != '\n') {
|
|
/* Incomplete line */
|
|
priv->remainder = xrealloc(priv->remainder,
|
|
priv->remainder_size +
|
|
mb[i].size);
|
|
memcpy(priv->remainder + priv->remainder_size,
|
|
mb[i].ptr, mb[i].size);
|
|
priv->remainder_size += mb[i].size;
|
|
continue;
|
|
}
|
|
|
|
/* we have a complete line */
|
|
if (!priv->remainder) {
|
|
consume_one(priv, mb[i].ptr, mb[i].size);
|
|
continue;
|
|
}
|
|
priv->remainder = xrealloc(priv->remainder,
|
|
priv->remainder_size +
|
|
mb[i].size);
|
|
memcpy(priv->remainder + priv->remainder_size,
|
|
mb[i].ptr, mb[i].size);
|
|
consume_one(priv, priv->remainder,
|
|
priv->remainder_size + mb[i].size);
|
|
free(priv->remainder);
|
|
priv->remainder = NULL;
|
|
priv->remainder_size = 0;
|
|
}
|
|
if (priv->remainder) {
|
|
consume_one(priv, priv->remainder, priv->remainder_size);
|
|
free(priv->remainder);
|
|
priv->remainder = NULL;
|
|
priv->remainder_size = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int read_mmfile(mmfile_t *ptr, const char *filename)
|
|
{
|
|
struct stat st;
|
|
FILE *f;
|
|
size_t sz;
|
|
|
|
if (stat(filename, &st))
|
|
return error("Could not stat %s", filename);
|
|
if ((f = fopen(filename, "rb")) == NULL)
|
|
return error("Could not open %s", filename);
|
|
sz = xsize_t(st.st_size);
|
|
ptr->ptr = xmalloc(sz);
|
|
if (fread(ptr->ptr, sz, 1, f) != 1)
|
|
return error("Could not read %s", filename);
|
|
fclose(f);
|
|
ptr->size = sz;
|
|
return 0;
|
|
}
|
|
|
|
|