char *strrep(const char *s, unsigned n);
void* greedy_realloc(void **p, size_t *allocated, size_t need);
+
+static inline void _reset_errno_(int *saved_errno) {
+ errno = *saved_errno;
+}
+
+#define PROTECT_ERRNO __attribute__((cleanup(_reset_errno_))) int _saved_errno_ = errno
+
+struct umask_struct {
+ mode_t mask;
+ bool quit;
+};
+
+static inline void _reset_umask_(struct umask_struct *s) {
+ umask(s->mask);
+};
+
+#define RUN_WITH_UMASK(mask) \
+ for (__attribute__((cleanup(_reset_umask_))) struct umask_struct _saved_umask_ = { umask(mask), false }; \
+ !_saved_umask_.quit ; \
+ _saved_umask_.quit = true)