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53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/*
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* xgetcwd.c -- return current directory with unlimited length
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* Copyright (C) 1992, 1996 Free Software Foundation, Inc.
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* Written by David MacKenzie <djm@gnu.ai.mit.edu>.
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*
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* Special function for busybox written by Vladimir Oleynik <vodz@usa.net>
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*/
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <limits.h>
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#include "libbb.h"
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/* Amount to increase buffer size by in each try. */
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#define PATH_INCR 32
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/* Return the current directory, newly allocated, arbitrarily long.
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Return NULL and set errno on error.
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If argument is not NULL (previous usage allocate memory), call free()
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*/
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char *
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xgetcwd (char *cwd)
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{
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char *ret;
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unsigned path_max;
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errno = 0;
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path_max = (unsigned) PATH_MAX;
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path_max += 2; /* The getcwd docs say to do this. */
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if(cwd==0)
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cwd = xmalloc (path_max);
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errno = 0;
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while ((ret = getcwd (cwd, path_max)) == NULL && errno == ERANGE) {
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path_max += PATH_INCR;
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cwd = xrealloc (cwd, path_max);
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errno = 0;
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}
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if (ret == NULL) {
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int save_errno = errno;
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free (cwd);
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errno = save_errno;
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perror_msg("getcwd()");
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return NULL;
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}
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return cwd;
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}
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