diff options
Diffstat (limited to 'usr.bin/from/from.c')
| -rw-r--r-- | usr.bin/from/from.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/usr.bin/from/from.c b/usr.bin/from/from.c new file mode 100644 index 0000000..324bceb --- /dev/null +++ b/usr.bin/from/from.c @@ -0,0 +1,136 @@ +/* + * Copyright (c) 1980, 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char copyright[] = +"@(#) Copyright (c) 1980, 1988, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93"; +#endif /* not lint */ + +#include <sys/types.h> +#include <ctype.h> +#include <pwd.h> +#include <stdio.h> +#include <paths.h> + +main(argc, argv) + int argc; + char **argv; +{ + extern char *optarg; + extern int optind; + struct passwd *pwd; + int ch, newline; + char *file, *sender, *p; +#if MAXPATHLEN > BUFSIZ + char buf[MAXPATHLEN]; +#else + char buf[BUFSIZ]; +#endif + + file = sender = NULL; + while ((ch = getopt(argc, argv, "f:s:")) != EOF) + switch((char)ch) { + case 'f': + file = optarg; + break; + case 's': + sender = optarg; + for (p = sender; *p; ++p) + if (isupper(*p)) + *p = tolower(*p); + break; + case '?': + default: + fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n"); + exit(1); + } + argv += optind; + + if (!file) { + if (!(file = *argv)) { + if (!(pwd = getpwuid(getuid()))) { + fprintf(stderr, + "from: no password file entry for you.\n"); + exit(1); + } + file = pwd->pw_name; + } + (void)sprintf(buf, "%s/%s", _PATH_MAILDIR, file); + file = buf; + } + if (!freopen(file, "r", stdin)) { + fprintf(stderr, "from: can't read %s.\n", file); + exit(1); + } + for (newline = 1; fgets(buf, sizeof(buf), stdin);) { + if (*buf == '\n') { + newline = 1; + continue; + } + if (newline && !strncmp(buf, "From ", 5) && + (!sender || match(buf + 5, sender))) + printf("%s", buf); + newline = 0; + } + exit(0); +} + +match(line, sender) + register char *line, *sender; +{ + register char ch, pch, first, *p, *t; + + for (first = *sender++;;) { + if (isspace(ch = *line)) + return(0); + ++line; + if (isupper(ch)) + ch = tolower(ch); + if (ch != first) + continue; + for (p = sender, t = line;;) { + if (!(pch = *p++)) + return(1); + if (isupper(ch = *t++)) + ch = tolower(ch); + if (ch != pch) + break; + } + } + /* NOTREACHED */ +} |
