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 /* 32 * logdir() 33 * 34 * This routine does not use the getpwent(3) library routine 35 * because the latter uses the stdio package. The allocation of 36 * storage in this package destroys the integrity of the shell's 37 * storage allocation. 38 */ 39 40 #include <fcntl.h> /* O_RDONLY */ 41 #include <stdlib.h> 42 #include <unistd.h> 43 #include <string.h> 44 45 #define BUFSIZ 160 46 47 static char line[BUFSIZ+1]; 48 49 static char * 50 passwdfield(char *p) 51 { 52 while (*p && *p != ':') 53 ++p; 54 if (*p) 55 *p++ = 0; 56 return (p); 57 } 58 59 char * 60 logdir(char *name) 61 { 62 char *p; 63 int i, j; 64 int pwf; 65 66 /* attempt to open the password file */ 67 if ((pwf = open("/etc/passwd", O_RDONLY)) == -1) 68 return (0); 69 70 /* find the matching password entry */ 71 do { 72 /* get the next line in the password file */ 73 i = read(pwf, line, BUFSIZ); 74 for (j = 0; j < i; j++) 75 if (line[j] == '\n') 76 break; 77 /* return a null pointer if the whole file has been read */ 78 if (j >= i) 79 return (0); 80 line[++j] = 0; /* terminate the line */ 81 /* point at the next line */ 82 (void) lseek(pwf, (long)(j - i), 1); 83 p = passwdfield(line); /* get the logname */ 84 } while (*name != *line || /* fast pretest */ 85 strcmp(name, line) != 0); 86 (void) close(pwf); 87 88 /* skip the intervening fields */ 89 p = passwdfield(p); 90 p = passwdfield(p); 91 p = passwdfield(p); 92 p = passwdfield(p); 93 94 /* return the login directory */ 95 (void) passwdfield(p); 96 return (p); 97 } 98