Fix in-place editing functions in convert.c

* crlf_to_git and ident_to_git:

  Don't grow the buffer if there is enough space in the first place.
  As a side effect, when the editing is done "in place", we don't grow, so
  the buffer pointer doesn't changes, and `src' isn't invalidated anymore.

  Thanks to Bernt Hansen for the bug report.

* apply_filter:

  Fix memory leak due to fake in-place editing that didn't collected the
  old buffer when the filter succeeds. Also a cosmetic fix.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

diff --git a/convert.c b/convert.c
index 0d5e909c696dac8b900713a992c72cd9cacf94e3..aa95834eb3e3f55a2bcb8e6c6f8258f4a57b594e 100644 (file)
--- a/convert.c
+++ b/convert.c
@@ -110,7 +110,9 @@ static int crlf_to_git(const char *path, const char *src, size_t len,
                        return 0;
        }
 
-       strbuf_grow(buf, len);
+       /* only grow if not in place */
+       if (strbuf_avail(buf) + buf->len < len)
+               strbuf_grow(buf, len - buf->len);
        dst = buf->buf;
        if (action == CRLF_GUESS) {
                /*
@@ -281,20 +283,19 @@ static int apply_filter(const char *path, const char *src, size_t len,
                ret = 0;
        }
        if (close(pipe_feed[0])) {
-               ret = error("read from external filter %s failed", cmd);
+               error("read from external filter %s failed", cmd);
                ret = 0;
        }
        status = finish_command(&child_process);
        if (status) {
-               ret = error("external filter %s failed %d", cmd, -status);
+               error("external filter %s failed %d", cmd, -status);
                ret = 0;
        }
 
        if (ret) {
-               *dst = nbuf;
-       } else {
-               strbuf_release(&nbuf);
+               strbuf_swap(dst, &nbuf);
        }
+       strbuf_release(&nbuf);
        return ret;
 }
 
@@ -422,7 +423,9 @@ static int ident_to_git(const char *path, const char *src, size_t len,
        if (!ident || !count_ident(src, len))
                return 0;
 
-       strbuf_grow(buf, len);
+       /* only grow if not in place */
+       if (strbuf_avail(buf) + buf->len < len)
+               strbuf_grow(buf, len - buf->len);
        dst = buf->buf;
        for (;;) {
                dollar = memchr(src, '$', len);