Implement generic GL extension string parser.

Split QGL_ParseExtensionString into Com_ParseExtensionString, to be
shared between QGL and GLX/WGL subsystems.

1 files changed, 39 insertions, 0 deletions

diff --git a/src/common.c b/src/common.c
index 28b007b..29cc07b 100644
--- a/src/common.c
+++ b/src/common.c
@@ -1311,6 +1311,45 @@ color_index_t Com_ParseColor( const char *s, color_index_t last ) {
     return COLOR_NONE;
 }
 
+#if USE_REF == REF_GL
+/*
+================
+Com_ParseExtensionString
+
+Helper function to parse an OpenGL-style extension string.
+================
+*/
+unsigned Com_ParseExtensionString( const char *s, const char *const extnames[] ) {
+    unsigned mask;
+    const char *p;
+    size_t l1, l2;
+    int i;
+
+    if( !s ) {
+        return 0;
+    }
+
+    mask = 0;
+    while( *s ) {
+        p = Q_strchrnul( s, ' ' );
+        l1 = p - s;
+        for( i = 0; extnames[i]; i++ ) {
+            l2 = strlen( extnames[i] );
+            if( l1 == l2 && !memcmp( s, extnames[i], l1 ) ) {
+                mask |= 1 << i;
+                break;
+            }
+        }
+        if( !*p ) {
+            break;
+        }
+        s = p + 1;
+    }
+
+    return mask;
+}
+#endif
+
 /*
 ================
 Com_PlayerToEntityState