* Written by David MacKenzie <djm@gnu.ai.mit.edu>.
*
* Special function for busybox written by Vladimir Oleynik <dzo@simtreas.ru>
-*/
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
#include "libbb.h"
-/* Amount to increase buffer size by in each try. */
-#define PATH_INCR 32
-
/* Return the current directory, newly allocated, arbitrarily long.
Return NULL and set errno on error.
If argument is not NULL (previous usage allocate memory), call free()
*/
-char *
-xgetcwd(char *cwd)
+char* FAST_FUNC
+xrealloc_getcwd_or_warn(char *cwd)
{
+#define PATH_INCR 64
+
char *ret;
unsigned path_max;
- path_max = (unsigned) PATH_MAX;
- path_max += 2; /* The getcwd docs say to do this. */
+ path_max = 128; /* 128 + 64 should be enough for 99% of cases */
- if (cwd==0)
- cwd = xmalloc(path_max);
-
- while ((ret = getcwd(cwd, path_max)) == NULL && errno == ERANGE) {
+ while (1) {
path_max += PATH_INCR;
cwd = xrealloc(cwd, path_max);
+ ret = getcwd(cwd, path_max);
+ if (ret == NULL) {
+ if (errno == ERANGE)
+ continue;
+ free(cwd);
+ bb_perror_msg("getcwd");
+ return NULL;
+ }
+ cwd = xrealloc(cwd, strlen(cwd) + 1);
+ return cwd;
}
-
- if (ret == NULL) {
- free(cwd);
- bb_perror_msg("getcwd");
- return NULL;
- }
-
- return cwd;
}