Add PIGLIT_STRIP_ARG() macro for extracting args during piglit config.

v2: Fix update of *argc.

Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

tests/util/piglit-framework-gl.c

@@ -176,3 +176,22 @@ piglit_set_reshape_func(void (*func)(int w, int h))
 	if (!gl_fw->set_reshape_func)
 		gl_fw->set_reshape_func(gl_fw, func);
 }
+
+
+/**
+ * Search for an argument with the given name in the argument list.
+ * If it is found, remove it and return true.
+ */
+bool
+piglit_strip_arg(int *argc, char *argv[], const char *arg)
+{
+	int i;
+	for (i = 1; i < *argc; i++) {
+		if (!strcmp(argv[i], arg)) {
+			delete_arg(argv, *argc, i);
+			*argc -= 1;
+			return true;
+		}
+	}
+	return false;
+}

tests/util/piglit-framework-gl.h

@@ -249,5 +249,13 @@ void piglit_present_results();
 void piglit_post_redisplay(void);
 void piglit_set_keyboard_func(void (*func)(unsigned char key, int x, int y));
 void piglit_set_reshape_func(void (*func)(int w, int h));
+bool piglit_strip_arg(int *argc, char *argv[], const char *arg);
+
+/**
+ * Convenience macro for invoking piglit_strip_arg() from within
+ * piglit_init() or between PIGLIT_GL_TEST_CONFIG_BEGIN and
+ * PIGLIT_GL_TEST_CONFIG_END.
+ */
+#define PIGLIT_STRIP_ARG(arg) piglit_strip_arg(&argc, argv, arg)
 
 #endif /* PIGLIT_FRAMEWORK_H */