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rewrite of glutExtensionSupported - works correctly now

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git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@122 7f0cb862-5218-0410-a997-914c9d46530a
This commit is contained in:
brianp 2003-07-02 15:53:05 +00:00
parent 6fadddb78a
commit 66dc199794
1 changed files with 21 additions and 32 deletions
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53
freeglut/freeglut/src/freeglut_misc.c
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@ -50,9 +50,9 @@
*/
int FGAPIENTRY glutExtensionSupported( const char* extension )
{
const char *extensions;
const char *extensions, *start;
const char *ptr;
int len = strlen ( extension ) ;
const int len = strlen( extension ) ;
/*
* Make sure there is a current window, and thus -- a current context available
@ -60,42 +60,31 @@ int FGAPIENTRY glutExtensionSupported( const char* extension )
freeglut_assert_ready;
freeglut_return_val_if_fail( fgStructure.Window != NULL, 0 );
/*
* Check if the extension itself looks valid (contains no spaces)
*/
if (strchr(extension, ' '))
return 0;
/*
* Note it is safe to query the extensions
*/
extensions = glGetString(GL_EXTENSIONS);
start = extensions = (const char *) glGetString(GL_EXTENSIONS);
/* XXX consider printing a warning to stderr that there's no current
* rendering context.
*/
freeglut_return_val_if_fail( extensions != NULL, 0 );
/*
* Check if the extension itself looks valid
*/
if ( strchr ( extension, ' ' ) != NULL )
return( 0 );
/*
* Look for our extension
*/
for (ptr = extensions; *ptr;)
{
/*
* Is it the current extension?
*/
if ( strncmp ( extension, extensions, len ) == 0 )
return 1 ;
/*
* No, go find the next extension. They are separated from each other by one or more blank spaces.
*/
ptr = strchr ( ptr, ' ' ) ;
/*
* If we ran off the end of the "extensions" character string, we didn't find it. Return failure.
*/
if ( !ptr ) return 0 ;
while ( *ptr == ' ' )
ptr++ ;
while (1) {
const char *p = strstr(extensions, extension);
if (!p)
return 0; /* not found */
/* check that the match isn't a super string */
if ((p == start || p[-1] == ' ') && (p[len] == ' ' || p[len] == 0))
return 1;
/* skip the false match and continue */
extensions = p + len;
}
return 0 ;