| The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1 | /*- |
| 2 | * Copyright (c) 2002 The NetBSD Foundation, Inc. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software contributed to The NetBSD Foundation |
| 6 | * by Christos Zoulas. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. All advertising materials mentioning features or use of this software |
| 17 | * must display the following acknowledgement: |
| 18 | * This product includes software developed by the NetBSD |
| 19 | * Foundation, Inc. and its contributors. |
| 20 | * 4. Neither the name of The NetBSD Foundation nor the names of its |
| 21 | * contributors may be used to endorse or promote products derived |
| 22 | * from this software without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 25 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 26 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 27 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 28 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 34 | * POSSIBILITY OF SUCH DAMAGE. |
| 35 | */ |
| 36 | #include <sys/cdefs.h> |
| 37 | |
| 38 | #include <sys/types.h> |
| 39 | #include <sys/param.h> |
| 40 | #include <stdio.h> |
| 41 | #include <string.h> |
| 42 | #include <time.h> |
| 43 | #include <utmp.h> |
| 44 | |
| 45 | static struct utmp utmp; |
| 46 | static FILE *ut; |
| 47 | static char utfile[MAXPATHLEN] = _PATH_UTMP; |
| 48 | |
| 49 | void |
| 50 | setutent(void) |
| 51 | { |
| 52 | if (ut == NULL) |
| 53 | return; |
| 54 | (void)fseeko(ut, (off_t)0, SEEK_SET); |
| 55 | } |
| 56 | |
| 57 | struct utmp * |
| 58 | getutent(void) |
| 59 | { |
| 60 | if (ut == NULL) { |
| 61 | if ((ut = fopen(utfile, "r")) == NULL) |
| 62 | return NULL; |
| 63 | } |
| 64 | if (fread(&utmp, sizeof(utmp), 1, ut) == 1) |
| 65 | return &utmp; |
| 66 | return NULL; |
| 67 | } |
| 68 | |
| 69 | void |
| 70 | endutent(void) |
| 71 | { |
| 72 | if (ut != NULL) { |
| 73 | (void)fclose(ut); |
| 74 | ut = NULL; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | int |
| 79 | utmpname(const char *fname) |
| 80 | { |
| 81 | size_t len = strlen(fname); |
| 82 | |
| 83 | if (len >= sizeof(utfile)) |
| 84 | return 0; |
| 85 | |
| 86 | /* must not end in x! */ |
| 87 | if (fname[len - 1] == 'x') |
| 88 | return 0; |
| 89 | |
| 90 | (void)strlcpy(utfile, fname, sizeof(utfile)); |
| 91 | endutent(); |
| 92 | return 1; |
| 93 | } |