Simplify extension array

Use NULL as array terminator and don't store the count of extensions
anymore

glad/generator/c/templates/gl.c

@@ -42,12 +42,21 @@ static void _post_call_{{ feature_set.name }}_callback_default(void *ret, const
 #define GLAD_GL_IS_SOME_NEW_VERSION 0
 #endif
 
-static int glad_gl_get_extensions({{ template_utils.context_arg(',') }} int version, const char **out_exts, unsigned int *out_num_exts_i, char ***out_exts_i) {
+static void glad_gl_free_extensions(char **exts_i) {
+    if (exts_i != NULL) {
+        unsigned int index;
+        for(index = 0; exts_i[index]; index++) {
+            free((void *) (exts_i[index]));
+        }
+        free((void *)exts_i);
+        exts_i = NULL;
+    }
+}
+static int glad_gl_get_extensions({{ template_utils.context_arg(',') }} int version, const char **out_exts, char ***out_exts_i) {
 #if GLAD_GL_IS_SOME_NEW_VERSION
     if(GLAD_VERSION_MAJOR(version) < 3) {
 #else
     GLAD_UNUSED(version);
-    GLAD_UNUSED(out_num_exts_i);
     GLAD_UNUSED(out_exts_i);
 #endif
         if ({{ 'glGetString'|ctx }} == NULL) {
@@ -63,9 +72,7 @@ static int glad_gl_get_extensions({{ template_utils.context_arg(',') }} int vers
             return 0;
         }
         {{ 'glGetIntegerv'|ctx }}(GL_NUM_EXTENSIONS, (int*) &num_exts_i);
-        if (num_exts_i > 0) {
-            exts_i = (char **) malloc(num_exts_i * (sizeof *exts_i));
-        }
+        exts_i = (char **) malloc((num_exts_i + 1) * (sizeof *exts_i));
         if (exts_i == NULL) {
             return 0;
         }
@@ -74,30 +81,23 @@ static int glad_gl_get_extensions({{ template_utils.context_arg(',') }} int vers
             size_t len = strlen(gl_str_tmp) + 1;
 
             char *local_str = (char*) malloc(len * sizeof(char));
-            if(local_str != NULL) {
-                memcpy(local_str, gl_str_tmp, len * sizeof(char));
+            if(local_str == NULL) {
+                exts_i[index] = NULL;
+                glad_gl_free_extensions(exts_i);
+                return 0;
             }
 
+            memcpy(local_str, gl_str_tmp, len * sizeof(char));
             exts_i[index] = local_str;
         }
+        exts_i[index] = NULL;
 
-        *out_num_exts_i = num_exts_i;
         *out_exts_i = exts_i;
     }
 #endif
     return 1;
 }
-static void glad_gl_free_extensions(char **exts_i, unsigned int num_exts_i) {
-    if (exts_i != NULL) {
-        unsigned int index;
-        for(index = 0; index < num_exts_i; index++) {
-            free((void *) (exts_i[index]));
-        }
-        free((void *)exts_i);
-        exts_i = NULL;
-    }
-}
-static int glad_gl_has_extension(int version, const char *exts, unsigned int num_exts_i, char **exts_i, const char *ext) {
+static int glad_gl_has_extension(int version, const char *exts, char **exts_i, const char *ext) {
     if(GLAD_VERSION_MAJOR(version) < 3 || !GLAD_GL_IS_SOME_NEW_VERSION) {
         const char *extensions;
         const char *loc;
@@ -120,7 +120,7 @@ static int glad_gl_has_extension(int version, const char *exts, unsigned int num
         }
     } else {
         unsigned int index;
-        for(index = 0; index < num_exts_i; index++) {
+        for(index = 0; exts_i[index]; index++) {
             const char *e = exts_i[index];
             if(strcmp(e, ext) == 0) {
                 return 1;
@@ -137,17 +137,16 @@ static GLADapiproc glad_gl_get_proc_from_userptr(void *userptr, const char* name
 {% for api in feature_set.info.apis %}
 static int glad_gl_find_extensions_{{ api|lower }}({{ template_utils.context_arg(',') }} int version) {
     const char *exts = NULL;
-    unsigned int num_exts_i = 0;
     char **exts_i = NULL;
-    if (!glad_gl_get_extensions({{ 'context, ' if options.mx }}version, &exts, &num_exts_i, &exts_i)) return 0;
+    if (!glad_gl_get_extensions({{ 'context, ' if options.mx }}version, &exts, &exts_i)) return 0;
 
 {% for extension in feature_set.extensions|select('supports', api) %}
-    {{ ('GLAD_' + extension.name)|ctx(name_only=True) }} = glad_gl_has_extension(version, exts, num_exts_i, exts_i, "{{ extension.name }}");
+    {{ ('GLAD_' + extension.name)|ctx(name_only=True) }} = glad_gl_has_extension(version, exts, exts_i, "{{ extension.name }}");
 {% else %}
     GLAD_UNUSED(glad_gl_has_extension);
 {% endfor %}
 
-    glad_gl_free_extensions(exts_i, num_exts_i);
+    glad_gl_free_extensions(exts_i);
 
     return 1;
 }