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 /* 34 * logdir() 35 * 36 * This routine does not use the getpwent(3) library routine 37 * because the latter uses the stdio package. The allocation of 38 * storage in this package destroys the integrity of the shell's 39 * storage allocation. 40 */ 41 42 #include <fcntl.h> /* O_RDONLY */ 43 #include <stdlib.h> 44 #include <unistd.h> 45 #include <string.h> 46 47 #define BUFSIZ 160 48 49 static char line[BUFSIZ+1]; 50 51 static char * 52 passwdfield(char *p) 53 { 54 while (*p && *p != ':') 55 ++p; 56 if (*p) 57 *p++ = 0; 58 return (p); 59 } 60 61 char * 62 logdir(char *name) 63 { 64 char *p; 65 int i, j; 66 int pwf; 67 68 /* attempt to open the password file */ 69 if ((pwf = open("/etc/passwd", O_RDONLY)) == -1) 70 return (0); 71 72 /* find the matching password entry */ 73 do { 74 /* get the next line in the password file */ 75 i = read(pwf, line, BUFSIZ); 76 for (j = 0; j < i; j++) 77 if (line[j] == '\n') 78 break; 79 /* return a null pointer if the whole file has been read */ 80 if (j >= i) 81 return (0); 82 line[++j] = 0; /* terminate the line */ 83 /* point at the next line */ 84 (void) lseek(pwf, (long)(j - i), 1); 85 p = passwdfield(line); /* get the logname */ 86 } while (*name != *line || /* fast pretest */ 87 strcmp(name, line) != 0); 88 (void) close(pwf); 89 90 /* skip the intervening fields */ 91 p = passwdfield(p); 92 p = passwdfield(p); 93 p = passwdfield(p); 94 p = passwdfield(p); 95 96 /* return the login directory */ 97 (void) passwdfield(p); 98 return (p); 99 } 100