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glX HasExtension(): check for NULL ext string first.

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It's slightly faster than failing later, after a strchr() call, since this
will get called multiple times with a NULL string if the system totally
fails elsewhere.
This commit is contained in:
Ryan C. Gordon 2015-02-17 22:59:56 -05:00
parent 052720f7d5
commit f0c061d141
1 changed files with 3 additions and 3 deletions
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6
src/video/x11/SDL_x11opengl.c
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@ -279,14 +279,14 @@ HasExtension(const char *extension, const char *extensions)
const char *start;
const char *where, *terminator;
if (!extensions)
return SDL_FALSE;
/* Extension names should not have spaces. */
where = SDL_strchr(extension, ' ');
if (where || *extension == '\0')
return SDL_FALSE;
if (!extensions)
return SDL_FALSE;
/* It takes a bit of care to be fool-proof about parsing the
* OpenGL extensions string. Don't be fooled by sub-strings,
* etc. */