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[FFmpeg-devel,v2,12/14] avfilter/avfilter: Honour the short options documentation

Message ID AM7PR03MB6660950FBA032B1CB4D7A7638FD99@AM7PR03MB6660.eurprd03.prod.outlook.com
State New
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Series [FFmpeg-devel,v2,01/14] avfilter/vsrc_testsrc: Deduplicate AVClasses
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Commit Message

Andreas Rheinhardt Sept. 13, 2021, 11:23 p.m. UTC
The documentation for filter arguments states that short options must
precede long options (i.e. those of the form key=value). Yet if
process_options() encounters arguments not abiding by this, it simply
treats short options after a long option as if it were parsing short
options for the first time. In particular, it overwrites options already
set earlier, possibly via other short options. This is not how it is
intended (as a comment in the code indicates).

This commit modifies the code to reject further shorthand options
after a long option has been encountered. After all, avfilter_init_str()
errors out upon unrecognized options, so it is intended to be picky.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavfilter/avfilter.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Comments

Nicolas George Sept. 16, 2021, 12:56 p.m. UTC | #1
Andreas Rheinhardt (12021-09-14):
> The documentation for filter arguments states that short options must
> precede long options (i.e. those of the form key=value). Yet if
> process_options() encounters arguments not abiding by this, it simply
> treats short options after a long option as if it were parsing short
> options for the first time. In particular, it overwrites options already
> set earlier, possibly via other short options. This is not how it is
> intended (as a comment in the code indicates).
> 
> This commit modifies the code to reject further shorthand options
> after a long option has been encountered. After all, avfilter_init_str()
> errors out upon unrecognized options, so it is intended to be picky.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
>  libavfilter/avfilter.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

Since you have a good reason to use a pointer instead of a integer
boolean, then ok.

Regards,
diff mbox series

Patch

diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index cc499fd5ed..165ab1f44a 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -814,6 +814,7 @@  static int process_options(AVFilterContext *ctx, AVDictionary **options,
     const AVOption *o = NULL;
     int ret;
     char *av_uninit(parsed_key), *av_uninit(value);
+    const AVClass *priv = ctx->filter->priv_class;
     const char *key;
     int offset= -1;
 
@@ -824,8 +825,7 @@  static int process_options(AVFilterContext *ctx, AVDictionary **options,
         const char *shorthand = NULL;
         int flags = AV_DICT_DONT_STRDUP_VAL;
 
-        o = av_opt_next(ctx->priv, o);
-        if (o) {
+        if (priv && (o = av_opt_next(ctx->priv, o))) {
             if (o->type == AV_OPT_TYPE_CONST || o->offset == offset)
                 continue;
             offset = o->offset;
@@ -848,7 +848,7 @@  static int process_options(AVFilterContext *ctx, AVDictionary **options,
         if (parsed_key) {
             key = parsed_key;
             flags |= AV_DICT_DONT_STRDUP_KEY;
-            while ((o = av_opt_next(ctx->priv, o))); /* discard all remaining shorthand */
+            priv = NULL; /* reject all remaining shorthand */
         } else {
             key = shorthand;
         }