Introduce sstrndup wrapper.

i3bar/src/workspaces.c

@@ -106,7 +106,7 @@ static int workspaces_string_cb(void *params_, const unsigned char *val, size_t
 
     if (!strcmp(params->cur_key, "name")) {
         const char *ws_name = (const char *)val;
-        params->workspaces_walk->canonical_name = strndup(ws_name, len);
+        params->workspaces_walk->canonical_name = sstrndup(ws_name, len);
 
         if (config.strip_ws_numbers && params->workspaces_walk->num >= 0) {
             /* Special case: strip off the workspace number */

include/libi3.h

@@ -127,6 +127,13 @@ void *srealloc(void *ptr, size_t size);
  */
 char *sstrdup(const char *str);
 
+/**
+ * Safe-wrapper around strndup which exits if strndup returns NULL (meaning that
+ * there is no more memory available)
+ *
+ */
+char *sstrndup(const char *str, size_t size);
+
 /**
  * Safe-wrapper around asprintf which exits if it returns -1 (meaning that
  * there is no more memory available)

libi3/resolve_tilde.c

@@ -23,7 +23,7 @@ char *resolve_tilde(const char *path) {
     char *head, *tail, *result;
 
     tail = strchr(path, '/');
-    head = strndup(path, tail ? (size_t)(tail - path) : strlen(path));
+    head = sstrndup(path, tail ? (size_t)(tail - path) : strlen(path));
 
     int res = glob(head, GLOB_TILDE, NULL, &globbuf);
     free(head);

libi3/safewrappers.c

@@ -48,6 +48,13 @@ char *sstrdup(const char *str) {
     return result;
 }
 
+char *sstrndup(const char *str, size_t size) {
+    char *result = strndup(str, size);
+    if (result == NULL)
+        err(EXIT_FAILURE, "strndup()");
+    return result;
+}
+
 int sasprintf(char **strp, const char *fmt, ...) {
     va_list args;
     int result;