When `git blame` shows date field in a fixed width (as long as
blame_date_width characters), if time_str shorter than that, add spaces
for padding. But there are two bugs in the following codes:
memcpy(time_buf, time_str, time_len);
memset(time_buf + time_len, ' ', blame_date_width - time_len);
1. The type of blame_date_width is size_t (unsigned int). If time_len
is greater than blame_ate_width, "blame_date_width - time_len" will
never be a negative number, but a really big positive number, and
will cause memory overwrite.
This bug can be triggered if either l10n message for function
show_date_relative() in date.c is longer then 30 charcters, then
`git blame --date relative` may fail.
2. When show blame information with relative time, the UTF-8 characters
in time_str will break the alignment of columns after the date field.
This is because the time_buf padding with spaces should have a
constant display width, not a fixed strlen size. So we should call
utf8_strwidth() instead of strlen() for calibration.
Signed-off-by: Jiang Xin <[email protected]>
---
builtin/blame.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/builtin/blame.c b/builtin/blame.c
index 88cb799..0a0a858 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -1556,22 +1556,31 @@ static void assign_blame(struct scoreboard *sb, int opt)
static const char *format_time(unsigned long time, const char *tz_str,
int show_raw_time)
{
- static char time_buf[128];
+ static struct strbuf time_buf = STRBUF_INIT;
+ strbuf_reset(&time_buf);
if (show_raw_time) {
- snprintf(time_buf, sizeof(time_buf), "%lu %s", time, tz_str);
+ strbuf_addf(&time_buf, "%lu %s", time, tz_str);
}
else {
const char *time_str;
+ size_t time_width;
int time_len;
int tz;
tz = atoi(tz_str);
time_str = show_date(time, tz, blame_date_mode);
time_len = strlen(time_str);
- memcpy(time_buf, time_str, time_len);
- memset(time_buf + time_len, ' ', blame_date_width - time_len);
+ strbuf_add(&time_buf, time_str, time_len);
+ /*
+ * Add space paddings to time_buf to display a fixed width
+ * string, and use time_width for display width calibration.
+ */
+ for (time_width = utf8_strwidth(time_str);
+ time_width < blame_date_width;
+ time_width++)
+ strbuf_addch(&time_buf, ' ');
}
- return time_buf;
+ return time_buf.buf;
}
#define OUTPUT_ANNOTATE_COMPAT 001
--
2.0.0.rc0.3.g444188f.dirty
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