1/*
2 * Copyright (c) 1980, 1988, 1993
3 * The Regents of the University of California. 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

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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
35static char copyright[] =
36"@(#) Copyright (c) 1980, 1988, 1993\n\
37 The Regents of the University of California. All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93";
42#endif /* not lint */
43
44#include <sys/types.h>
45
46#include <ctype.h>
47#include <pwd.h>
48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51#include <paths.h>
52
53main(argc, argv)
54 int argc;
55 char **argv;
56{
57 extern char *optarg;
58 extern int optind;
59 struct passwd *pwd;
60 int ch, newline;
61 char *file, *sender, *p;
62#if MAXPATHLEN > BUFSIZ
63 char buf[MAXPATHLEN];
64#else
65 char buf[BUFSIZ];
66#endif
67
68 file = sender = NULL;
69 while ((ch = getopt(argc, argv, "f:s:?")) != -1)
70 switch((char)ch) {
71 case 'f':
72 file = optarg;
73 break;
74 case 's':
75 sender = optarg;
76 for (p = sender; *p; ++p)
77 if (isupper(*p))
78 *p = tolower(*p);
79 break;
80 case '?':
81 default:
82 fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n");
83 exit(1);
84 }
85 argv += optind;
86
87 if (!file) {
88 if (*argv) {
89 (void)sprintf(buf, "%s/%s", _PATH_MAILDIR, *argv);
90 file = buf;
91 } else {
92 if (!(file = getenv("MAIL"))) {
93 if (!(pwd = getpwuid(getuid()))) {
94 (void)fprintf(stderr,
95 "from: no password file entry for you.\n");
96 exit(1);
97 }
98 file = pwd->pw_name;
99 (void)sprintf(buf,
100 "%s/%s", _PATH_MAILDIR, file);
101 file = buf;
102 }
103 }
104 }
105
106 /* read from stdin */
107 if (strcmp(file, "-") == 0) {
108 }
109 else if (!freopen(file, "r", stdin)) {
110 fprintf(stderr, "from: can't read %s.\n", file);
111 exit(1);
112 }
113 for (newline = 1; fgets(buf, sizeof(buf), stdin);) {
114 if (*buf == '\n') {
115 newline = 1;
116 continue;
117 }
118 if (newline && !strncmp(buf, "From ", 5) &&
119 (!sender || match(buf + 5, sender)))
120 printf("%s", buf);
121 newline = 0;
122 }
123 exit(0);
124}
125
126match(line, sender)
127 register char *line, *sender;
128{
129 register char ch, pch, first, *p, *t;
130
131 for (first = *sender++;;) {
132 if (isspace(ch = *line))
133 return(0);

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