To discover filenames from the --- and +++ lines in a traditional
unified diff, currently "git apply" scans forward for a whitespace
character on each line and stops there. It can't use the whole line
because "diff -u" likes to include timestamps, like so:
--- foo 2000-07-12 16:56:50.020000414 -0500
+++ bar 2010-07-12 16:56:50.020000414 -0500
The whitespace-seeking heuristic works great, even when the tab
has been converted to spaces by some email + copy-and-paste
related corruption.
Except for one problem: if the filename itself contains whitespace,
the inferred filename will be too short.
When Giuseppe ran into this problem, it was for a file creation
patch (for debian/licenses/LICENSE.global BSD-style Chromium).
So one can't use the list of files present in the index to deduce an
appropriate filename (not to mention that way lies madness; see
v0.99~402, 2005-05-31).
Instead, look for a timestamp and use that if present to mark the end
of the filename. If no timestamp is present, the old heuristic is
used, with one exception: the space character \040 is not considered
terminating whitespace any more unless it is followed by a timestamp.
Reported-by: Giuseppe Iuculano <iuculano@xxxxxxxxxx>
Acked-by: Guido Günther <agx@xxxxxxxxxxx>
Signed-off-by: Jonathan Nieder <jrnieder@xxxxxxxxx>
---
Thanks for the helpful advice and patience at my use of it.
builtin/apply.c | 193 +++++++++++++++++++++++++++++++++++---
t/t4135-apply-weird-filenames.sh | 4 +-
2 files changed, 181 insertions(+), 16 deletions(-)
diff --git a/builtin/apply.c b/builtin/apply.c
index efc109e..bd2fcb3 100644
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -449,23 +449,157 @@ static char *find_name_gnu(const char *line, char *def, int p_value)
return squash_slash(strbuf_detach(&name, NULL));
}
-static char *find_name(const char *line, char *def, int p_value, int terminate)
+static size_t tz_len(const char *line, size_t len)
+{
+ const char *tz, *p;
+
+ if (len < strlen(" +0500") || line[len-strlen(" +0500")] != ' ')
+ return 0;
+ tz = line + len - strlen(" +0500");
+
+ if (tz[1] != '+' && tz[1] != '-')
+ return 0;
+
+ for (p = tz + 2; p != line + len; p++)
+ if (!isdigit(*p))
+ return 0;
+
+ return line + len - tz;
+}
+
+static size_t date_len(const char *line, size_t len)
+{
+ const char *date, *p;
+
+ if (len < strlen("72-02-05") || line[len-strlen("-05")] != '-')
+ return 0;
+ p = date = line + len - strlen("72-02-05");
+
+ if (!isdigit(*p++) || !isdigit(*p++) || *p++ != '-' ||
+ !isdigit(*p++) || !isdigit(*p++) || *p++ != '-' ||
+ !isdigit(*p++) || !isdigit(*p++)) /* Not a date. */
+ return 0;
+
+ if (date - line >= strlen("19") &&
+ isdigit(date[-1]) && isdigit(date[-2])) /* 4-digit year */
+ date -= strlen("19");
+
+ return line + len - date;
+}
+
+static size_t short_time_len(const char *line, size_t len)
+{
+ const char *time, *p;
+
+ if (len < strlen(" 07:01:32") || line[len-strlen(":32")] != ':')
+ return 0;
+ p = time = line + len - strlen(" 07:01:32");
+
+ /* Permit 1-digit hours? */
+ if (*p++ != ' ' ||
+ !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
+ !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
+ !isdigit(*p++) || !isdigit(*p++)) /* Not a time. */
+ return 0;
+
+ return line + len - time;
+}
+
+static size_t fractional_time_len(const char *line, size_t len)
+{
+ const char *p;
+ size_t n;
+
+ /* Expected format: 19:41:17.620000023 */
+ if (!len || !isdigit(line[len - 1]))
+ return 0;
+ p = line + len - 1;
+
+ /* Fractional seconds. */
+ while (p > line && isdigit(*p))
+ p--;
+ if (*p != '.')
+ return 0;
+
+ /* Hours, minutes, and whole seconds. */
+ n = short_time_len(line, p - line);
+ if (!n)
+ return 0;
+
+ return line + len - p + n;
+}
+
+static size_t trailing_spaces_len(const char *line, size_t len)
+{
+ const char *p;
+
+ /* Expected format: ' ' x (1 or more) */
+ if (!len || line[len - 1] != ' ')
+ return 0;
+
+ p = line + len;
+ while (p != line) {
+ p--;
+ if (*p != ' ')
+ return line + len - (p + 1);
+ }
+
+ /* All spaces! */
+ return len;
+}
+
+static size_t diff_timestamp_len(const char *line, size_t len)
+{
+ const char *end = line + len;
+ size_t n;
+
+ /*
+ * Posix: 2010-07-05 19:41:17
+ * GNU: 2010-07-05 19:41:17.620000023 -0500
+ */
+
+ if (!isdigit(end[-1]))
+ return 0;
+
+ n = tz_len(line, end - line);
+ end -= n;
+
+ n = short_time_len(line, end - line);
+ if (!n)
+ n = fractional_time_len(line, end - line);
+ end -= n;
+
+ n = date_len(line, end - line);
+ if (!n) /* No date. Too bad. */
+ return 0;
+ end -= n;
+
+ if (end == line) /* No space before date. */
+ return 0;
+ if (end[-1] == '\t') { /* Success! */
+ end--;
+ return line + len - end;
+ }
+ if (end[-1] != ' ') /* No space before date. */
+ return 0;
+
+ /* Whitespace damage. */
+ end -= trailing_spaces_len(line, end - line);
+ return line + len - end;
+}
+
+static char *find_name_common(const char *line, char *def, int p_value,
+ const char *end, int terminate)
{
int len;
const char *start = NULL;
- if (*line == '"') {
- char *name = find_name_gnu(line, def, p_value);
- if (name)
- return name;
- }
-
if (p_value == 0)
start = line;
- for (;;) {
+ while (line != end) {
char c = *line;
- if (isspace(c)) {
+ if (!end && isspace(c)) {
if (c == '\n')
break;
if (name_terminate(start, line-start, c, terminate))
@@ -505,6 +639,37 @@ static char *find_name(const char *line, char *def, int p_value, int terminate)
return squash_slash(xmemdupz(start, len));
}
+static char *find_name(const char *line, char *def, int p_value, int terminate)
+{
+ if (*line == '"') {
+ char *name = find_name_gnu(line, def, p_value);
+ if (name)
+ return name;
+ }
+
+ return find_name_common(line, def, p_value, NULL, terminate);
+}
+
+static char *find_name_traditional(const char *line, char *def, int p_value)
+{
+ size_t len = strlen(line);
+ size_t date_len;
+
+ if (*line == '"') {
+ char *name = find_name_gnu(line, def, p_value);
+ if (name)
+ return name;
+ }
+
+ len = strchrnul(line, '\n') - line;
+ date_len = diff_timestamp_len(line, len);
+ if (!date_len)
+ return find_name_common(line, def, p_value, NULL, TERM_TAB);
+ len -= date_len;
+
+ return find_name_common(line, def, p_value, line + len, 0);
+}
+
static int count_slashes(const char *cp)
{
int cnt = 0;
@@ -527,7 +692,7 @@ static int guess_p_value(const char *nameline)
if (is_dev_null(nameline))
return -1;
- name = find_name(nameline, NULL, 0, TERM_SPACE | TERM_TAB);
+ name = find_name_traditional(nameline, NULL, 0);
if (!name)
return -1;
cp = strchr(name, '/');
@@ -646,16 +811,16 @@ static void parse_traditional_patch(const char *first, const char *second, struc
if (is_dev_null(first)) {
patch->is_new = 1;
patch->is_delete = 0;
- name = find_name(second, NULL, p_value, TERM_SPACE | TERM_TAB);
+ name = find_name_traditional(second, NULL, p_value);
patch->new_name = name;
} else if (is_dev_null(second)) {
patch->is_new = 0;
patch->is_delete = 1;
- name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
+ name = find_name_traditional(first, NULL, p_value);
patch->old_name = name;
} else {
- name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
- name = find_name(second, name, p_value, TERM_SPACE | TERM_TAB);
+ name = find_name_traditional(first, NULL, p_value);
+ name = find_name_traditional(second, name, p_value);
if (has_epoch_timestamp(first)) {
patch->is_new = 1;
patch->is_delete = 0;
diff --git a/t/t4135-apply-weird-filenames.sh b/t/t4135-apply-weird-filenames.sh
index 9373f64..1e5aad5 100755
--- a/t/t4135-apply-weird-filenames.sh
+++ b/t/t4135-apply-weird-filenames.sh
@@ -59,8 +59,8 @@ try_filename() {
}
try_filename 'plain' 'postimage.txt'
-try_filename 'with spaces' 'post image.txt' '' success failure failure
-try_filename 'with tab' 'post image.txt' FUNNYNAMES success failure failure
+try_filename 'with spaces' 'post image.txt'
+try_filename 'with tab' 'post image.txt' FUNNYNAMES
try_filename 'with backslash' 'post\image.txt' BSLASHPSPEC
try_filename 'with quote' '"postimage".txt' FUNNYNAMES success failure success
--
1.7.2.1.544.ga752d.dirty
--
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