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Merge branch 'jc/maint-lf-to-crlf-keep-crlf'

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* jc/maint-lf-to-crlf-keep-crlf:
  lf_to_crlf_filter(): resurrect CRLF->CRLF hack
This commit is contained in:
Junio C Hamano 2011-12-22 11:27:29 -08:00
parent e927c16751 8496f56873
commit 339aff0846
1 changed files with 50 additions and 10 deletions
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60
convert.c
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@ -879,7 +879,8 @@ int is_null_stream_filter(struct stream_filter *filter)
struct lf_to_crlf_filter { struct lf_to_crlf_filter {
struct stream_filter filter; struct stream_filter filter;
unsigned want_lf:1; unsigned has_held:1;
char held;
}; };
static int lf_to_crlf_filter_fn(struct stream_filter *filter, static int lf_to_crlf_filter_fn(struct stream_filter *filter,
@ -889,10 +890,14 @@ static int lf_to_crlf_filter_fn(struct stream_filter *filter,
size_t count, o = 0; size_t count, o = 0;
struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter; 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) { * We may be holding onto the CR to see if it is followed by a
output[o++] = '\n'; * LF, in which case we would need to go to the main loop.
lf_to_crlf->want_lf = 0; * Otherwise, just emit it to the output stream.
*/
if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) {
output[o++] = lf_to_crlf->held;
lf_to_crlf->has_held = 0;
} }
/* We are told to drain */ /* We are told to drain */
@ -902,22 +907,57 @@ static int lf_to_crlf_filter_fn(struct stream_filter *filter,
} }
count = *isize_p; count = *isize_p;
if (count) { if (count || lf_to_crlf->has_held) {
size_t i; size_t i;
int was_cr = 0;
if (lf_to_crlf->has_held) {
was_cr = 1;
lf_to_crlf->has_held = 0;
}
for (i = 0; o < *osize_p && i < count; i++) { for (i = 0; o < *osize_p && i < count; i++) {
char ch = input[i]; char ch = input[i];
if (ch == '\n') { if (ch == '\n') {
output[o++] = '\r'; output[o++] = '\r';
if (o >= *osize_p) { } else if (was_cr) {
lf_to_crlf->want_lf = 1; /*
continue; /* We need to increase i */ * Previous round saw CR and it is not followed
} * by a LF; emit the CR before processing the
* current character.
*/
output[o++] = '\r';
} }
/*
* We may have consumed the last output slot,
* in which case we need to break out of this
* loop; hold the current character before
* returning.
*/
if (*osize_p <= o) {
lf_to_crlf->has_held = 1;
lf_to_crlf->held = ch;
continue; /* break but increment i */
}
if (ch == '\r') {
was_cr = 1;
continue;
}
was_cr = 0;
output[o++] = ch; output[o++] = ch;
} }
*osize_p -= o; *osize_p -= o;
*isize_p -= i; *isize_p -= i;
if (!lf_to_crlf->has_held && was_cr) {
lf_to_crlf->has_held = 1;
lf_to_crlf->held = '\r';
}
} }
return 0; return 0;
} }