76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/* xgetwd.c -- return current directory with unlimited length
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Copyright (C) 1992 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details. */
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/* Derived from xgetcwd.c in e.g. the GNU sh-utils. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "system.h"
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#include <stdio.h>
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#include <sys/types.h>
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#ifndef HAVE_GETWD
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char *getwd ();
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#define GETWD(buf, max) getwd (buf)
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#else
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char *getcwd ();
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#define GETWD(buf, max) getcwd (buf, max)
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#endif
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/* Amount by which to increase buffer size when allocating more space. */
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#define PATH_INCR 32
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char *xmalloc ();
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char *xrealloc ();
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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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char *
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xgetwd ()
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{
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char *cwd;
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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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cwd = xmalloc (path_max);
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errno = 0;
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while ((ret = GETWD (cwd, path_max)) == NULL && errno == ERANGE)
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{
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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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{
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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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return NULL;
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}
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return cwd;
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}
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