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/* 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_simple_perror_msg("getcwd");
return NULL;
}
cwd = xrealloc(cwd, strlen(cwd) + 1);
return cwd;
}
}
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