Introduce sstrndup wrapper.

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;