lib/libc/gen/getcwd.c

   1 /*
   2  * Copyright (c) 1989, 1991, 1993, 1995
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/lib/libc/gen/getcwd.c,v 1.18 1999/09/28 13:24:13 marcel Exp $
  30  *
  31  * @(#)getcwd.c 8.5 (Berkeley) 2/7/95
  32  */
  33
  34 #include <sys/param.h>
  35 #include <errno.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39
  40 int     __getcwd(char *pt, size_t size);
  41
  42 char *
  43 getcwd(char *pt, size_t size)
  44 {
  45         int allocated = 0, ret;
  46
  47         /*
  48          * If no buffer specified by the user, allocate one as necessary.
  49          */
  50         if (pt == NULL) {
  51                 size = MAXPATHLEN;
  52                 if ((pt = malloc(MAXPATHLEN)) == NULL)
  53                         return(NULL);
  54                 allocated = 1;
  55         }
  56         ret = __getcwd(pt, size);
  57         if (ret == 0)
  58                 return (pt);
  59         if (allocated)
  60                 free(pt);
  61         return (NULL);
  62 }
  63
  64 char *
  65 getwd(char *buf)
  66 {
  67         char *p;
  68
  69         if ((p = getcwd(buf, MAXPATHLEN)) != 0)
  70                 return(p);
  71         strcpy(buf, strerror(errno));
  72         return(NULL);
  73 }