GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/from/from.c Lines: 0 60 0.0 %
Date: 2017-11-13 Branches: 0 65 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: from.c,v 1.25 2017/05/31 19:41:30 millert Exp $	*/
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/*	$NetBSD: from.c,v 1.6 1995/09/01 01:39:10 jtc Exp $	*/
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/*
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 * Copyright (c) 1980, 1988, 1993
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 *	The Regents of the University of California.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/types.h>
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#include <ctype.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <paths.h>
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#include <string.h>
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#include <err.h>
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#include <errno.h>
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int	match(char *, char *);
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char	*mail_spool(char *file, const char *user);
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int
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main(int argc, char *argv[])
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{
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	int ch, newline, fflag = 0;
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	char *file, *line, *sender, *p;
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	size_t linesize = 0;
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	ssize_t linelen;
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	FILE *fp;
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	file = line = sender = NULL;
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	while ((ch = getopt(argc, argv, "f:s:")) != -1) {
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		switch(ch) {
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		case 'f':
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			fflag = 1;
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			file = optarg;
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			break;
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		case 's':
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			sender = optarg;
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			for (p = sender; *p; ++p)
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				if (isupper((unsigned char)*p))
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					*p = tolower((unsigned char)*p);
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			break;
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		default:
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			fprintf(stderr,
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			    "usage: from [-f file] [-s sender] [user]\n");
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			exit(EXIT_FAILURE);
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		}
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	}
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	argv += optind;
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	if (pledge("stdio rpath getpw flock cpath wpath", NULL) == -1)
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		err(1, "pledge");
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	file = mail_spool(file, *argv);
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	if ((fp = fopen(file, "r")) == NULL) {
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		if (!fflag && errno == ENOENT)
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			exit(EXIT_SUCCESS);
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		err(1, "%s", file);
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	}
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	if (pledge("stdio flock rpath cpath wpath", NULL) == -1)
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		err(1, "pledge");
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	for (newline = 1; (linelen = getline(&line, &linesize, fp)) != -1;) {
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		if (*line == '\n') {
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			newline = 1;
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			continue;
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		}
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		if (newline && !strncmp(line, "From ", 5) &&
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		    (!sender || match(line + 5, sender)))
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			printf("%s", line);
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		newline = 0;
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	}
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	free(line);
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	if (ferror(fp))
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		err(EXIT_FAILURE, "getline");
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	fclose(fp);
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	exit(EXIT_SUCCESS);
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}
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char *
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mail_spool(char *file, const char *user)
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{
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	struct passwd *pwd;
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	/*
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	 * We find the mailbox by:
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	 *	1 -f flag
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	 *	2 _PATH_MAILDIR/user (from argv)
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	 *	2 MAIL environment variable
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	 *	3 _PATH_MAILDIR/user (from environment or passwd db)
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	 */
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	if (file == NULL) {
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		if (user == NULL) {
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			if ((file = getenv("MAIL")) == NULL) {
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				if ((user = getenv("LOGNAME")) == NULL &&
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				    (user = getenv("USER")) == NULL) {
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					if (!(pwd = getpwuid(getuid())))
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						errx(1, "no password file "
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						    "entry for you");
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					user = pwd->pw_name;
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				}
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			}
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		}
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		if (file == NULL) {
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			if (asprintf(&file, "%s/%s", _PATH_MAILDIR, user) == -1)
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				err(1, NULL);
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		}
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	}
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	return(file);
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}
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int
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match(char *line, char *sender)
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{
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	char ch, pch, first, *p, *t;
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	for (first = *sender++;;) {
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		if (isspace((unsigned char)(ch = *line)))
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			return(0);
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		++line;
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		if (isupper((unsigned char)ch))
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			ch = tolower((unsigned char)ch);
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		if (ch != first)
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			continue;
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		for (p = sender, t = line;;) {
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			if (!(pch = *p++))
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				return(1);
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			if (isupper((unsigned char)(ch = *t++)))
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				ch = tolower((unsigned char)ch);
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			if (ch != pch)
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				break;
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		}
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	}
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	/* NOTREACHED */
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}