Annotation of src/usr.bin/from/from.c, Revision 1.7
1.7 ! deraadt 1: /* $OpenBSD: from.c,v 1.6 2000/01/18 04:57:55 millert Exp $ */
1.1 deraadt 2: /* $NetBSD: from.c,v 1.6 1995/09/01 01:39:10 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1980, 1988, 1993
6: * The Regents of the University of California. All rights reserved.
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 University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: static char copyright[] =
39: "@(#) Copyright (c) 1980, 1988, 1993\n\
40: The Regents of the University of California. All rights reserved.\n";
41: #endif /* not lint */
42:
43: #ifndef lint
44: #if 0
45: static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93";
46: #endif
1.7 ! deraadt 47: static char rcsid[] = "$OpenBSD: from.c,v 1.6 2000/01/18 04:57:55 millert Exp $";
1.1 deraadt 48: #endif /* not lint */
49:
50: #include <sys/types.h>
51: #include <ctype.h>
52: #include <pwd.h>
53: #include <stdio.h>
54: #include <stdlib.h>
55: #include <unistd.h>
56: #include <paths.h>
1.7 ! deraadt 57: #include <string.h>
1.4 mickey 58: #include <err.h>
1.1 deraadt 59:
1.7 ! deraadt 60: int match(char *, char *);
! 61:
! 62: int
1.1 deraadt 63: main(argc, argv)
64: int argc;
65: char **argv;
66: {
67: extern char *optarg;
68: extern int optind;
69: struct passwd *pwd;
70: int ch, newline;
71: char *file, *sender, *p;
72: #if MAXPATHLEN > BUFSIZ
73: char buf[MAXPATHLEN];
74: #else
75: char buf[BUFSIZ];
76: #endif
77:
78: file = sender = NULL;
1.3 millert 79: while ((ch = getopt(argc, argv, "f:s:")) != -1)
1.1 deraadt 80: switch((char)ch) {
81: case 'f':
82: file = optarg;
83: break;
84: case 's':
85: sender = optarg;
86: for (p = sender; *p; ++p)
87: if (isupper(*p))
88: *p = tolower(*p);
89: break;
90: case '?':
91: default:
92: fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n");
93: exit(1);
94: }
95: argv += optind;
96:
97: /*
98: * We find the mailbox by:
99: * 1 -f flag
100: * 2 user
101: * 2 MAIL environment variable
102: * 3 _PATH_MAILDIR/file
103: */
104: if (!file) {
105: if (!(file = *argv)) {
106: if (!(file = getenv("MAIL"))) {
1.4 mickey 107: if (!(pwd = getpwuid(getuid())))
108: errx(1, "no password file entry for you");
1.7 ! deraadt 109: if ((file = getenv("USER"))) {
1.5 aaron 110: (void)snprintf(buf, sizeof(buf),
111: "%s/%s", _PATH_MAILDIR, file);
1.1 deraadt 112: file = buf;
113: } else
1.5 aaron 114: (void)snprintf(file = buf, sizeof(buf),
115: "%s/%s", _PATH_MAILDIR,
116: pwd->pw_name);
1.1 deraadt 117: }
118: } else {
1.5 aaron 119: (void)snprintf(buf, sizeof(buf), "%s/%s",
120: _PATH_MAILDIR, file);
1.1 deraadt 121: file = buf;
122: }
123: }
1.4 mickey 124: if (!freopen(file, "r", stdin))
1.6 millert 125: err(1, "%s", file);
1.1 deraadt 126: for (newline = 1; fgets(buf, sizeof(buf), stdin);) {
127: if (*buf == '\n') {
128: newline = 1;
129: continue;
130: }
131: if (newline && !strncmp(buf, "From ", 5) &&
132: (!sender || match(buf + 5, sender)))
133: printf("%s", buf);
134: newline = 0;
135: }
136: exit(0);
137: }
138:
1.7 ! deraadt 139: int
1.1 deraadt 140: match(line, sender)
1.7 ! deraadt 141: char *line, *sender;
1.1 deraadt 142: {
143: register char ch, pch, first, *p, *t;
144:
145: for (first = *sender++;;) {
146: if (isspace(ch = *line))
147: return(0);
148: ++line;
149: if (isupper(ch))
150: ch = tolower(ch);
151: if (ch != first)
152: continue;
153: for (p = sender, t = line;;) {
154: if (!(pch = *p++))
155: return(1);
156: if (isupper(ch = *t++))
157: ch = tolower(ch);
158: if (ch != pch)
159: break;
160: }
161: }
162: /* NOTREACHED */
163: }
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