util: Use g_malloc/g_free in envlist.c

Change malloc/strdup/free to g_malloc/g_strdup/g_free in
util/envlist.c.

Remove NULL checks for pointers returned from g_malloc and g_strdup
as they exit in case of failure. Also, update calls to envlist_create
to reflect this.

Free array and array contents returned by envlist_to_environ using
g_free in bsd-user/main.c and linux-user/main.c.

Update comments to reflect change in semantics.

Signed-off-by: Saurav Sachidanand <sauravsachidanand@gmail.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

bsd-user/main.c

@@ -744,10 +744,7 @@ int main(int argc, char **argv)
     qemu_init_cpu_list();
     module_call_init(MODULE_INIT_QOM);
 
-    if ((envlist = envlist_create()) == NULL) {
+    envlist = envlist_create();
-        (void) fprintf(stderr, "Unable to allocate envlist\n");
-        exit(1);
-    }
 
     /* add current environment into the list */
     for (wrk = environ; *wrk != NULL; wrk++) {
@@ -785,10 +782,7 @@ int main(int argc, char **argv)
                 usage();
         } else if (!strcmp(r, "ignore-environment")) {
             envlist_free(envlist);
-            if ((envlist = envlist_create()) == NULL) {
+            envlist = envlist_create();
-                (void) fprintf(stderr, "Unable to allocate envlist\n");
-                exit(1);
-            }
         } else if (!strcmp(r, "U")) {
             r = argv[optind++];
             if (envlist_unsetenv(envlist, r) != 0)
@@ -956,10 +950,10 @@ int main(int argc, char **argv)
     }
 
     for (wrk = target_environ; *wrk; wrk++) {
-        free(*wrk);
+        g_free(*wrk);
     }
 
-    free(target_environ);
+    g_free(target_environ);
 
     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
         qemu_log("guest_base  0x%lx\n", guest_base);

linux-user/main.c

@@ -4229,10 +4229,7 @@ int main(int argc, char **argv, char **envp)
     qemu_init_cpu_list();
     module_call_init(MODULE_INIT_QOM);
 
-    if ((envlist = envlist_create()) == NULL) {
+    envlist = envlist_create();
-        (void) fprintf(stderr, "Unable to allocate envlist\n");
-        exit(EXIT_FAILURE);
-    }
 
     /* add current environment into the list */
     for (wrk = environ; *wrk != NULL; wrk++) {
@@ -4429,10 +4426,10 @@ int main(int argc, char **argv, char **envp)
     }
 
     for (wrk = target_environ; *wrk; wrk++) {
-        free(*wrk);
+        g_free(*wrk);
     }
 
-    free(target_environ);
+    g_free(target_environ);
 
     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
         qemu_log("guest_base  0x%lx\n", guest_base);

util/envlist.c

@@ -17,16 +17,14 @@ static int envlist_parse(envlist_t *envlist,
     const char *env, int (*)(envlist_t *, const char *));
 
 /*
- * Allocates new envlist and returns pointer to that or
+ * Allocates new envlist and returns pointer to it.
- * NULL in case of error.
  */
 envlist_t *
 envlist_create(void)
 {
 	envlist_t *envlist;
 
-	if ((envlist = malloc(sizeof (*envlist))) == NULL)
+	envlist = g_malloc(sizeof(*envlist));
-		return (NULL);
 
 	QLIST_INIT(&envlist->el_entries);
 	envlist->el_count = 0;
@@ -48,10 +46,10 @@ envlist_free(envlist_t *envlist)
 		entry = envlist->el_entries.lh_first;
 		QLIST_REMOVE(entry, ev_link);
 
-		free((char *)entry->ev_var);
+		g_free((char *)entry->ev_var);
-		free(entry);
+		g_free(entry);
 	}
-	free(envlist);
+	g_free(envlist);
 }
 
 /*
@@ -101,8 +99,7 @@ envlist_parse(envlist_t *envlist, const char *env,
 	if ((envlist == NULL) || (env == NULL))
 		return (EINVAL);
 
-	if ((tmpenv = strdup(env)) == NULL)
+	tmpenv = g_strdup(env);
-		return (errno);
     envsave = tmpenv;
 
     do {
@@ -117,7 +114,7 @@ envlist_parse(envlist_t *envlist, const char *env,
         tmpenv = envvar + 1;
     } while (envvar != NULL);
 
-    free(envsave);
+    g_free(envsave);
     return ret;
 }
 
@@ -155,18 +152,14 @@ envlist_setenv(envlist_t *envlist, const char *env)
 
 	if (entry != NULL) {
 		QLIST_REMOVE(entry, ev_link);
-		free((char *)entry->ev_var);
+		g_free((char *)entry->ev_var);
-		free(entry);
+		g_free(entry);
 	} else {
 		envlist->el_count++;
 	}
 
-	if ((entry = malloc(sizeof (*entry))) == NULL)
+	entry = g_malloc(sizeof(*entry));
-		return (errno);
+	entry->ev_var = g_strdup(env);
-	if ((entry->ev_var = strdup(env)) == NULL) {
-		free(entry);
-		return (errno);
-	}
 	QLIST_INSERT_HEAD(&envlist->el_entries, entry, ev_link);
 
 	return (0);
@@ -201,8 +194,8 @@ envlist_unsetenv(envlist_t *envlist, const char *env)
 	}
 	if (entry != NULL) {
 		QLIST_REMOVE(entry, ev_link);
-		free((char *)entry->ev_var);
+		g_free((char *)entry->ev_var);
-		free(entry);
+		g_free(entry);
 
 		envlist->el_count--;
 	}
@@ -212,12 +205,12 @@ envlist_unsetenv(envlist_t *envlist, const char *env)
 /*
  * Returns given envlist as array of strings (in same form that
  * global variable environ is).  Caller must free returned memory
- * by calling free(3) for each element and for the array.  Returned
+ * by calling g_free for each element and the array.
- * array and given envlist are not related (no common references).
+ * Returned array and given envlist are not related (no common
+ * references).
  *
  * If caller provides count pointer, number of items in array is
- * stored there.  In case of error, NULL is returned and no memory
+ * stored there.
- * is allocated.
  */
 char **
 envlist_to_environ(const envlist_t *envlist, size_t *count)
@@ -225,13 +218,11 @@ envlist_to_environ(const envlist_t *envlist, size_t *count)
 	struct envlist_entry *entry;
 	char **env, **penv;
 
-	penv = env = malloc((envlist->el_count + 1) * sizeof (char *));
+	penv = env = g_malloc((envlist->el_count + 1) * sizeof(char *));
-	if (env == NULL)
-		return (NULL);
 
 	for (entry = envlist->el_entries.lh_first; entry != NULL;
 	    entry = entry->ev_link.le_next) {
-		*(penv++) = strdup(entry->ev_var);
+		*(penv++) = g_strdup(entry->ev_var);
 	}
 	*penv = NULL; /* NULL terminate the list */