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convert: track state in LF-to-CRLF filter 

There may not be enough space to store CRLF in the output. If we don't
fill the buffer, then the filter will keep getting called with the same
short buffer and will loop forever.

Instead, always store the CR and record whether there's a missing LF
if so we store it in the output buffer the next time the function gets
called.

Reported-by: Henrik Grubbström <grubba@roxen.com>
Signed-off-by: Carlos Martín Nieto <cmn@elego.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Carlos Martín Nieto 2011-11-28 11:48:12 +01:00 committed by Junio C Hamano
parent 703f05ad58
commit 284e3d280e
1 changed files with 37 additions and 13 deletions
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50
convert.c
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@ -876,24 +876,39 @@ int is_null_stream_filter(struct stream_filter *filter)
/*
* LF-to-CRLF filter
*/
struct lf_to_crlf_filter {
struct stream_filter filter;
int want_lf;
};
static int lf_to_crlf_filter_fn(struct stream_filter *filter,
const char *input, size_t *isize_p,
char *output, size_t *osize_p)
{
size_t count;
size_t count, o = 0;
struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter;
/* Output a pending LF if we need to */
if (lf_to_crlf->want_lf) {
output[o++] = '\n';
lf_to_crlf->want_lf = 0;
}
if (!input)
return 0; /* we do not keep any states */
return 0; /* We've already dealt with the state */
count = *isize_p;
if (count) {
size_t i, o;
for (i = o = 0; o < *osize_p && i < count; i++) {
size_t i;
for (i = 0; o < *osize_p && i < count; i++) {
char ch = input[i];
if (ch == '\n') {
if (o + 1 < *osize_p)
output[o++] = '\r';
else
break;
output[o++] = '\r';
if (o >= *osize_p) {
lf_to_crlf->want_lf = 1;
continue; /* We need to increase i */
}
}
output[o++] = ch;
}
@ -904,15 +919,24 @@ static int lf_to_crlf_filter_fn(struct stream_filter *filter,
return 0;
}
static void lf_to_crlf_free_fn(struct stream_filter *filter)
{
free(filter);
}
static struct stream_filter_vtbl lf_to_crlf_vtbl = {
lf_to_crlf_filter_fn,
null_free_fn,
lf_to_crlf_free_fn,
};
static struct stream_filter lf_to_crlf_filter_singleton = {
&lf_to_crlf_vtbl,
};
static struct stream_filter *lf_to_crlf_filter(void)
{
struct lf_to_crlf_filter *lf_to_crlf = xmalloc(sizeof(*lf_to_crlf));
lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl;
lf_to_crlf->want_lf = 0;
return (struct stream_filter *)lf_to_crlf;
}
/*
* Cascade filter
@ -1194,7 +1218,7 @@ struct stream_filter *get_stream_filter(const char *path, const unsigned char *s
else if (output_eol(crlf_action) == EOL_CRLF &&
!(crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS))
filter = cascade_filter(filter, &lf_to_crlf_filter_singleton);
filter = cascade_filter(filter, lf_to_crlf_filter());
return filter;
}