The branch, master has been updated
via 2296a9c1bc0636c9ccf5217a49d87d29638ea65a (commit)
via 50e94aadb2d624407c46c988857a767dce5020b7 (commit)
from 16d32a1c1d040d1b444ec476901d7458e1620301 (commit)
- Log -----------------------------------------------------------------
commit 2296a9c1bc0636c9ccf5217a49d87d29638ea65a
Author: Marton Balint <c...@passwd.hu>
AuthorDate: Sun Aug 24 21:35:41 2025 +0200
Commit: Marton Balint <c...@passwd.hu>
CommitDate: Sun Aug 31 09:37:59 2025 +0200
avutil/bprint: fix av_bprint_strftime with %p format string reporting
truncated output
strftime returns 0 in case of an empty output (e.g. %p format string with
some
locales), there is no way to distinguish this from a buffer-too-small error
condition. So we must use some heuristics to handle this case, and not
consume
INT_MAX RAM and falsely report a truncated output.
Signed-off-by: Marton Balint <c...@passwd.hu>
diff --git a/libavutil/bprint.c b/libavutil/bprint.c
index ac07a17326..11e0f08774 100644
--- a/libavutil/bprint.c
+++ b/libavutil/bprint.c
@@ -167,6 +167,7 @@ void av_bprint_strftime(AVBPrint *buf, const char *fmt,
const struct tm *tm)
{
unsigned room;
size_t l;
+ size_t fmt_len = strlen(fmt);
if (!*fmt)
return;
@@ -174,9 +175,18 @@ void av_bprint_strftime(AVBPrint *buf, const char *fmt,
const struct tm *tm)
room = av_bprint_room(buf);
if (room && (l = strftime(buf->str + buf->len, room, fmt, tm)))
break;
+
+ /* Due to the limitations of strftime() it is not possible to know if
+ * the output buffer is too small or the output is empty.
+ * However, a 256x output space requirement compared to the format
+ * string length is so unlikely we can safely assume empty output. This
+ * allows supporting possibly empty format strings like "%p". */
+ if (room >> 8 > fmt_len)
+ break;
+
/* strftime does not tell us how much room it would need: let us
retry with twice as much until the buffer is large enough */
- room = !room ? strlen(fmt) + 1 :
+ room = !room ? fmt_len + 1 :
room <= INT_MAX / 2 ? room * 2 : INT_MAX;
if (av_bprint_alloc(buf, room)) {
/* impossible to grow, try to manage something useful anyway */
commit 50e94aadb2d624407c46c988857a767dce5020b7
Author: Marton Balint <c...@passwd.hu>
AuthorDate: Sun Aug 24 21:42:54 2025 +0200
Commit: Marton Balint <c...@passwd.hu>
CommitDate: Sun Aug 31 09:37:59 2025 +0200
avutil/bprint: make av_bprintf use av_vbprintf
No reason to duplicate the code.
Signed-off-by: Marton Balint <c...@passwd.hu>
diff --git a/libavutil/bprint.c b/libavutil/bprint.c
index 4e9571715c..ac07a17326 100644
--- a/libavutil/bprint.c
+++ b/libavutil/bprint.c
@@ -96,17 +96,17 @@ void av_bprint_init_for_buffer(AVBPrint *buf, char *buffer,
unsigned size)
*buf->str = 0;
}
-void av_bprintf(AVBPrint *buf, const char *fmt, ...)
+void av_vbprintf(AVBPrint *buf, const char *fmt, va_list vl_arg)
{
unsigned room;
char *dst;
- va_list vl;
int extra_len;
+ va_list vl;
while (1) {
room = av_bprint_room(buf);
dst = room ? buf->str + buf->len : NULL;
- va_start(vl, fmt);
+ va_copy(vl, vl_arg);
extra_len = vsnprintf(dst, room, fmt, vl);
va_end(vl);
if (extra_len <= 0)
@@ -119,27 +119,12 @@ void av_bprintf(AVBPrint *buf, const char *fmt, ...)
av_bprint_grow(buf, extra_len);
}
-void av_vbprintf(AVBPrint *buf, const char *fmt, va_list vl_arg)
+void av_bprintf(AVBPrint *buf, const char *fmt, ...)
{
- unsigned room;
- char *dst;
- int extra_len;
va_list vl;
-
- while (1) {
- room = av_bprint_room(buf);
- dst = room ? buf->str + buf->len : NULL;
- va_copy(vl, vl_arg);
- extra_len = vsnprintf(dst, room, fmt, vl);
- va_end(vl);
- if (extra_len <= 0)
- return;
- if (extra_len < room)
- break;
- if (av_bprint_alloc(buf, extra_len))
- break;
- }
- av_bprint_grow(buf, extra_len);
+ va_start(vl, fmt);
+ av_vbprintf(buf, fmt, vl);
+ va_end(vl);
}
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
-----------------------------------------------------------------------
Summary of changes:
libavutil/bprint.c | 41 ++++++++++++++++++-----------------------
1 file changed, 18 insertions(+), 23 deletions(-)
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