| 1 | /* |
| 2 | * Copyright (c) 1980, 1988 The Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | #ifndef lint |
| 35 | char copyright[] = |
| 36 | "@(#) Copyright (c) 1980, 1988 The Regents of the University of California.\n\ |
| 37 | All rights reserved.\n"; |
| 38 | #endif /* not lint */ |
| 39 | |
| 40 | #ifndef lint |
| 41 | static char sccsid[] = "@(#)from.c 5.7 (Berkeley) 3/1/91"; |
| 42 | #endif /* not lint */ |
| 43 | |
| 44 | #include <sys/types.h> |
| 45 | #include <ctype.h> |
| 46 | #include <pwd.h> |
| 47 | #include <stdio.h> |
| 48 | #include <paths.h> |
| 49 | |
| 50 | main(argc, argv) |
| 51 | int argc; |
| 52 | char **argv; |
| 53 | { |
| 54 | extern char *optarg; |
| 55 | extern int optind; |
| 56 | struct passwd *pwd; |
| 57 | int ch, newline; |
| 58 | char *file, *sender, *p; |
| 59 | #if MAXPATHLEN > BUFSIZ |
| 60 | char buf[MAXPATHLEN]; |
| 61 | #else |
| 62 | char buf[BUFSIZ]; |
| 63 | #endif |
| 64 | |
| 65 | file = sender = NULL; |
| 66 | while ((ch = getopt(argc, argv, "f:s:")) != EOF) |
| 67 | switch((char)ch) { |
| 68 | case 'f': |
| 69 | file = optarg; |
| 70 | break; |
| 71 | case 's': |
| 72 | sender = optarg; |
| 73 | for (p = sender; *p; ++p) |
| 74 | if (isupper(*p)) |
| 75 | *p = tolower(*p); |
| 76 | break; |
| 77 | case '?': |
| 78 | default: |
| 79 | fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n"); |
| 80 | exit(1); |
| 81 | } |
| 82 | argv += optind; |
| 83 | |
| 84 | if (!file) { |
| 85 | if (!(file = *argv)) { |
| 86 | if (!(pwd = getpwuid(getuid()))) { |
| 87 | fprintf(stderr, |
| 88 | "from: no password file entry for you.\n"); |
| 89 | exit(1); |
| 90 | } |
| 91 | file = pwd->pw_name; |
| 92 | } |
| 93 | (void)sprintf(buf, "%s/%s", _PATH_MAILDIR, file); |
| 94 | file = buf; |
| 95 | } |
| 96 | if (!freopen(file, "r", stdin)) { |
| 97 | fprintf(stderr, "from: can't read %s.\n", file); |
| 98 | exit(1); |
| 99 | } |
| 100 | for (newline = 1; fgets(buf, sizeof(buf), stdin);) { |
| 101 | if (*buf == '\n') { |
| 102 | newline = 1; |
| 103 | continue; |
| 104 | } |
| 105 | if (newline && !strncmp(buf, "From ", 5) && |
| 106 | (!sender || match(buf + 5, sender))) |
| 107 | printf("%s", buf); |
| 108 | newline = 0; |
| 109 | } |
| 110 | exit(0); |
| 111 | } |
| 112 | |
| 113 | match(line, sender) |
| 114 | register char *line, *sender; |
| 115 | { |
| 116 | register char ch, pch, first, *p, *t; |
| 117 | |
| 118 | for (first = *sender++;;) { |
| 119 | if (isspace(ch = *line)) |
| 120 | return(0); |
| 121 | ++line; |
| 122 | if (isupper(ch)) |
| 123 | ch = tolower(ch); |
| 124 | if (ch != first) |
| 125 | continue; |
| 126 | for (p = sender, t = line;;) { |
| 127 | if (!(pch = *p++)) |
| 128 | return(1); |
| 129 | if (isupper(ch = *t++)) |
| 130 | ch = tolower(ch); |
| 131 | if (ch != pch) |
| 132 | break; |
| 133 | } |
| 134 | } |
| 135 | /* NOTREACHED */ |
| 136 | } |