usr/src/tools/cscope-fast/mygetwd.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1988 AT&T */
  23 /*        All Rights Reserved   */
  24
  25
  26 /*
  27  * Copyright (c) 1999 by Sun Microsystems, Inc.
  28  * All rights reserved.
  29  */
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32
  33 #include <sys/types.h>  /* needed by stat.h */
  34 #include <sys/stat.h>   /* stat */
  35 #include <stdio.h>      /* NULL */
  36 #include <string.h>     /* string functions */
  37 #include <stdlib.h>
  38
  39 /*
  40  * if the ksh PWD environment variable matches the current
  41  * working directory, don't call getwd()
  42  */
  43
  44 char *
  45 mygetwd(char *dir)
  46 {
  47         char    *pwd;                   /* PWD environment variable value */
  48         struct  stat    d_sb;           /* current directory status */
  49         struct  stat    tmp_sb;         /* temporary stat buffer */
  50         char    *getwd();
  51
  52         /* get the current directory's status */
  53         if (stat(".", &d_sb) < 0) {
  54                 return (NULL);
  55         }
  56         /* use $PWD if it matches this directory */
  57         if ((pwd = getenv("PWD")) != NULL && *pwd != '\0' &&
  58             stat(pwd, &tmp_sb) == 0 &&
  59             d_sb.st_ino == tmp_sb.st_ino && d_sb.st_dev == tmp_sb.st_dev) {
  60                 (void) strcpy(dir, pwd);
  61                 return (pwd);
  62         }
  63         return (getwd(dir));
  64 }