[Qemu-devel] [Qemu-trivial] [PATCH v2] util: Use g_malloc/g_free in envlist.c

[Saurav Sachidanand <sauravsachidanand@gmail.com>]

Change malloc/free to g_malloc/g_free in util/envlist.c, except for
entry->env_var which is allocated using strdup(3).

Remove NULL checks for pointers returned from g_malloc as it exits
in case of failure. Update calls to envlist_create to reflect this.

Free array returned by envlist_to_environ using g_free.

Update comments to reflect change in semantics.

Refactor nearby code to make scripts/checkpatch.pl happy.

Signed-off-by: Saurav Sachidanand <sauravsachidanand@gmail.com>
---
 bsd-user/main.c   | 12 +++---------
 linux-user/main.c |  7 ++-----
 util/envlist.c    | 34 +++++++++++++++-------------------
 3 files changed, 20 insertions(+), 33 deletions(-)

diff --git a/bsd-user/main.c b/bsd-user/main.c
index 714a692e6f..4d715840ff 100644
--- a/bsd-user/main.c
+++ b/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) {
-        (void) fprintf(stderr, "Unable to allocate envlist\n");
-        exit(1);
-    }
+    envlist = envlist_create();

     /* 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) {
-                (void) fprintf(stderr, "Unable to allocate envlist\n");
-                exit(1);
-            }
+            envlist = envlist_create();
         } else if (!strcmp(r, "U")) {
             r = argv[optind++];
             if (envlist_unsetenv(envlist, r) != 0)
@@ -959,7 +953,7 @@ int main(int argc, char **argv)
         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);
diff --git a/linux-user/main.c b/linux-user/main.c
index 10a3bb3a12..3542c899f6 100644
--- a/linux-user/main.c
+++ b/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) {
-        (void) fprintf(stderr, "Unable to allocate envlist\n");
-        exit(EXIT_FAILURE);
-    }
+    envlist = envlist_create();

     /* add current environment into the list */
     for (wrk = environ; *wrk != NULL; wrk++) {
@@ -4432,7 +4429,7 @@ int main(int argc, char **argv, char **envp)
         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);
diff --git a/util/envlist.c b/util/envlist.c
index e86857e70a..a42eefa5fe 100644
--- a/util/envlist.c
+++ b/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
- * NULL in case of error.
+ * Allocates new envlist and returns pointer to it.
  */
 envlist_t *
 envlist_create(void)
 {
 	envlist_t *envlist;

-	if ((envlist = malloc(sizeof (*envlist))) == NULL)
-		return (NULL);
+  envlist = g_malloc(sizeof(*envlist));

 	QLIST_INIT(&envlist->el_entries);
 	envlist->el_count = 0;
@@ -49,9 +47,9 @@ envlist_free(envlist_t *envlist)
 		QLIST_REMOVE(entry, ev_link);

 		free((char *)entry->ev_var);
-		free(entry);
+    g_free(entry);
 	}
-	free(envlist);
+  g_free(envlist);
 }

 /*
@@ -156,15 +154,15 @@ envlist_setenv(envlist_t *envlist, const char *env)
 	if (entry != NULL) {
 		QLIST_REMOVE(entry, ev_link);
 		free((char *)entry->ev_var);
-		free(entry);
+    g_free(entry);
 	} else {
 		envlist->el_count++;
 	}

-	if ((entry = malloc(sizeof (*entry))) == NULL)
-		return (errno);
-	if ((entry->ev_var = strdup(env)) == NULL) {
-		free(entry);
+  entry = g_malloc(sizeof(*entry));
+  entry->ev_var = strdup(env);
+  if (entry->ev_var == NULL) {
+    g_free(entry);
 		return (errno);
 	}
 	QLIST_INSERT_HEAD(&envlist->el_entries, entry, ev_link);
@@ -202,7 +200,7 @@ envlist_unsetenv(envlist_t *envlist, const char *env)
 	if (entry != NULL) {
 		QLIST_REMOVE(entry, ev_link);
 		free((char *)entry->ev_var);
-		free(entry);
+    g_free(entry);

 		envlist->el_count--;
 	}
@@ -212,12 +210,12 @@ 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
- * array and given envlist are not related (no common references).
+ * by calling free(3) for each element, and g_free for the array.
+ * 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
- * is allocated.
+ * stored there.
  */
 char **
 envlist_to_environ(const envlist_t *envlist, size_t *count)
@@ -225,9 +223,7 @@ 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 *));
-	if (env == NULL)
-		return (NULL);
+  penv = env = g_malloc((envlist->el_count + 1) * sizeof(char *));

 	for (entry = envlist->el_entries.lh_first; entry != NULL;
 	    entry = entry->ev_link.le_next) {
--
2.12.0