/* vi: set sw=4 ts=4: */ /* * xgetcwd.c -- return current directory with unlimited length * Copyright (C) 1992, 1996 Free Software Foundation, Inc. * 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" /* 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* FAST_FUNC xrealloc_getcwd_or_warn(char *cwd) { #define PATH_INCR 64 char *ret; unsigned path_max; path_max = 128; /* 128 + 64 should be enough for 99% of cases */ 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; } }