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      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 /*
     23  * Copyright 1989 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*      Copyright (c) 1984 AT&T */
     28 /*        All Rights Reserved   */
     29 #pragma ident	"%Z%%M%	%I%	%E% SMI"  /* from S5R2 1.2 */
     30 
     31 /*LINTLIBRARY*/
     32 /*
     33  * Library routine to GET the Current Working Directory.
     34  * arg1 is a pointer to a character buffer into which the
     35  * path name of the current directory is placed by the
     36  * subroutine.  arg1 may be zero, in which case the
     37  * subroutine will call malloc to get the required space.
     38  * arg2 is the length of the buffer space for the path-name.
     39  * If the actual path-name is longer than (arg2-2), or if
     40  * the value of arg2 is not at least 3, the subroutine will
     41  * return a value of zero, with errno set as appropriate.
     42  */
     43 
     44 #include <stdio.h>
     45 #include <sys/errno.h>
     46 
     47 extern FILE *popen();
     48 extern char *malloc(), *fgets(), *strchr();
     49 extern int errno, pclose();
     50 
     51 char *
     52 getcwd(arg1, arg2)
     53 char	*arg1;
     54 int	arg2;
     55 {
     56 	FILE	*pipe;
     57 	char	*trm;
     58 
     59 	if(arg2 <= 0) {
     60 		errno = EINVAL;
     61 		return(0);
     62 	}
     63 	if(arg1 == 0)
     64 		if((arg1 = malloc((unsigned)arg2)) == 0) {
     65 			errno = ENOMEM;
     66 			return(0);
     67 		}
     68 	errno = 0;
     69 	if((pipe = popen("pwd", "r")) == 0)
     70 		return(0);
     71 	(void) fgets(arg1, arg2, pipe);
     72 	(void) pclose(pipe);
     73 	trm = strchr(arg1, '\0');
     74 	if(*(trm-1) != '\n') {
     75 		errno = ERANGE;
     76 		return(0);
     77 	}
     78 	*(trm-1) = '\0';
     79 	return(arg1);
     80 }
     81