From 4682d8521c3ce9d722bd214fd7d5fc92063fdacb Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Wed, 27 Jun 2012 20:14:47 -0700 Subject: diff-index.c: "git diff" has no need to read blob from the standard input Only "diff --no-index -" does. Bolting the logic into the low-level function diff_populate_filespec() was a layering violation from day one. Move populate_from_stdin() function out of the generic diff.c to its only user, diff-index.c. Also make sure "-" from the command line stays a special token "read from the standard input", even if we later decide to sanitize the result from prefix_filename() function in a few obvious ways, e.g. removing unnecessary "./" prefix, duplicated slashes "//" in the middle, etc. Signed-off-by: Junio C Hamano --- diff-no-index.c | 52 +++++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 41 insertions(+), 11 deletions(-) (limited to 'diff-no-index.c') diff --git a/diff-no-index.c b/diff-no-index.c index ac41b68b0a1..09656bca1d1 100644 --- a/diff-no-index.c +++ b/diff-no-index.c @@ -32,6 +32,13 @@ static int read_directory(const char *path, struct string_list *list) return 0; } +/* + * This should be "(standard input)" or something, but it will + * probably expose many more breakages in the way no-index code + * is bolted onto the diff callchain. + */ +static const char file_from_standard_input[] = "-"; + static int get_mode(const char *path, int *mode) { struct stat st; @@ -42,7 +49,7 @@ static int get_mode(const char *path, int *mode) else if (!strcasecmp(path, "nul")) *mode = 0; #endif - else if (!strcmp(path, "-")) + else if (path == file_from_standard_input) *mode = create_ce_mode(0666); else if (lstat(path, &st)) return error("Could not access '%s'", path); @@ -51,6 +58,36 @@ static int get_mode(const char *path, int *mode) return 0; } +static int populate_from_stdin(struct diff_filespec *s) +{ + struct strbuf buf = STRBUF_INIT; + size_t size = 0; + + if (strbuf_read(&buf, 0, 0) < 0) + return error("error while reading from stdin %s", + strerror(errno)); + + s->should_munmap = 0; + s->data = strbuf_detach(&buf, &size); + s->size = size; + s->should_free = 1; + s->is_stdin = 1; + return 0; +} + +static struct diff_filespec *noindex_filespec(const char *name, int mode) +{ + struct diff_filespec *s; + + if (!name) + name = "/dev/null"; + s = alloc_filespec(name); + fill_filespec(s, null_sha1, mode); + if (name == file_from_standard_input) + populate_from_stdin(s); + return s; +} + static int queue_diff(struct diff_options *o, const char *name1, const char *name2) { @@ -135,15 +172,8 @@ static int queue_diff(struct diff_options *o, tmp_c = name1; name1 = name2; name2 = tmp_c; } - if (!name1) - name1 = "/dev/null"; - if (!name2) - name2 = "/dev/null"; - d1 = alloc_filespec(name1); - d2 = alloc_filespec(name2); - fill_filespec(d1, null_sha1, mode1); - fill_filespec(d2, null_sha1, mode2); - + d1 = noindex_filespec(name1, mode1); + d2 = noindex_filespec(name2, mode2); diff_queue(&diff_queued_diff, d1, d2); return 0; } @@ -238,7 +268,7 @@ void diff_no_index(struct rev_info *revs, * stdin should be spelled as "-"; if you have * path that is "-", spell it as "./-". */ - p = p; + p = file_from_standard_input; else if (prefixlen) p = xstrdup(prefix_filename(prefix, prefixlen, p)); paths[i] = p; -- cgit v1.2.3