fd1efedc79
It does extremely useful things like execute sendmail and spew dubiously accurate factoids. From the feedback, it seems like it is an essential utility in a modern unix and not at all a useless bikeshed. How do those Linux people live without it? Reverts r358561.
503 lines
11 KiB
C
503 lines
11 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1989, 1993, 1994
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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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94";
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#endif
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <langinfo.h>
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#include <locale.h>
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#include <pwd.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stringlist.h>
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#include <time.h>
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#include <unistd.h>
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#include "pathnames.h"
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#include "calendar.h"
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enum {
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T_OK = 0,
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T_ERR,
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T_PROCESS,
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};
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const char *calendarFile = "calendar"; /* default calendar file */
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static const char *calendarHomes[] = {".calendar", _PATH_INCLUDE}; /* HOME */
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static const char *calendarNoMail = "nomail";/* don't sent mail if file exist */
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static char path[MAXPATHLEN];
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struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
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struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
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static int cal_parse(FILE *in, FILE *out);
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static StringList *definitions = NULL;
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static struct event *events[MAXCOUNT];
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static char *extradata[MAXCOUNT];
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static void
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trimlr(char **buf)
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{
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char *walk = *buf;
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char *last;
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while (isspace(*walk))
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walk++;
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if (*walk != '\0') {
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last = walk + strlen(walk) - 1;
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while (last > walk && isspace(*last))
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last--;
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*(last+1) = 0;
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}
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*buf = walk;
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}
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static FILE *
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cal_fopen(const char *file)
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{
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FILE *fp;
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char *home = getenv("HOME");
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unsigned int i;
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if (home == NULL || *home == '\0') {
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warnx("Cannot get home directory");
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return (NULL);
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}
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if (chdir(home) != 0) {
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warnx("Cannot enter home directory");
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return (NULL);
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}
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for (i = 0; i < nitems(calendarHomes); i++) {
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if (chdir(calendarHomes[i]) != 0)
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continue;
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if ((fp = fopen(file, "r")) != NULL)
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return (fp);
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}
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warnx("can't open calendar file \"%s\"", file);
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return (NULL);
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}
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static int
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token(char *line, FILE *out, bool *skip)
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{
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char *walk, c, a;
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if (strncmp(line, "endif", 5) == 0) {
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*skip = false;
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return (T_OK);
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}
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if (*skip)
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return (T_OK);
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if (strncmp(line, "include", 7) == 0) {
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walk = line + 7;
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trimlr(&walk);
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if (*walk == '\0') {
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warnx("Expecting arguments after #include");
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return (T_ERR);
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}
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if (*walk != '<' && *walk != '\"') {
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warnx("Excecting '<' or '\"' after #include");
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return (T_ERR);
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}
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a = *walk;
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walk++;
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c = walk[strlen(walk) - 1];
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switch(c) {
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case '>':
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if (a != '<') {
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warnx("Unterminated include expecting '\"'");
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return (T_ERR);
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}
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break;
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case '\"':
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if (a != '\"') {
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warnx("Unterminated include expecting '>'");
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return (T_ERR);
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}
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break;
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default:
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warnx("Unterminated include expecting '%c'",
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a == '<' ? '>' : '\"' );
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return (T_ERR);
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}
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walk[strlen(walk) - 1] = '\0';
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if (cal_parse(cal_fopen(walk), out))
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return (T_ERR);
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return (T_OK);
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}
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if (strncmp(line, "define", 6) == 0) {
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if (definitions == NULL)
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definitions = sl_init();
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walk = line + 6;
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trimlr(&walk);
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if (*walk == '\0') {
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warnx("Expecting arguments after #define");
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return (T_ERR);
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}
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sl_add(definitions, strdup(walk));
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return (T_OK);
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}
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if (strncmp(line, "ifndef", 6) == 0) {
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walk = line + 6;
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trimlr(&walk);
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if (*walk == '\0') {
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warnx("Expecting arguments after #ifndef");
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return (T_ERR);
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}
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if (definitions != NULL && sl_find(definitions, walk) != NULL)
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*skip = true;
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return (T_OK);
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}
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return (T_PROCESS);
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}
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#define REPLACE(string, slen, struct_) \
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if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
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if (struct_.name != NULL) \
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free(struct_.name); \
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if ((struct_.name = strdup(buf + (slen))) == NULL) \
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errx(1, "cannot allocate memory"); \
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struct_.len = strlen(buf + (slen)); \
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continue; \
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}
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static int
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cal_parse(FILE *in, FILE *out)
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{
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char *line = NULL;
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char *buf;
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size_t linecap = 0;
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ssize_t linelen;
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ssize_t l;
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static int d_first = -1;
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static int count = 0;
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int i;
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int month[MAXCOUNT];
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int day[MAXCOUNT];
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int year[MAXCOUNT];
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bool skip = false;
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char dbuf[80];
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char *pp, p;
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struct tm tm;
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int flags;
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/* Unused */
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tm.tm_sec = 0;
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tm.tm_min = 0;
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tm.tm_hour = 0;
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tm.tm_wday = 0;
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if (in == NULL)
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return (1);
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while ((linelen = getline(&line, &linecap, in)) > 0) {
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if (*line == '#') {
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switch (token(line+1, out, &skip)) {
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case T_ERR:
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free(line);
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return (1);
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case T_OK:
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continue;
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case T_PROCESS:
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break;
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default:
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break;
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}
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}
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if (skip)
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continue;
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buf = line;
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for (l = linelen;
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l > 0 && isspace((unsigned char)buf[l - 1]);
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l--)
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;
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buf[l] = '\0';
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if (buf[0] == '\0')
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continue;
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/*
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* Setting LANG in user's calendar was an old workaround
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* for 'calendar -a' being run with C locale to properly
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* print user's calendars in their native languages.
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* Now that 'calendar -a' does fork with setusercontext(),
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* and does not run iconv(), this variable has little use.
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*/
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if (strncmp(buf, "LANG=", 5) == 0) {
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(void)setlocale(LC_ALL, buf + 5);
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d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
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#ifdef WITH_ICONV
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if (!doall)
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set_new_encoding();
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#endif
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setnnames();
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continue;
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}
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/* Parse special definitions: Easter, Paskha etc */
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REPLACE("Easter=", 7, neaster);
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REPLACE("Paskha=", 7, npaskha);
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REPLACE("ChineseNewYear=", 15, ncny);
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REPLACE("NewMoon=", 8, nnewmoon);
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REPLACE("FullMoon=", 9, nfullmoon);
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REPLACE("MarEquinox=", 11, nmarequinox);
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REPLACE("SepEquinox=", 11, nsepequinox);
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REPLACE("JunSolstice=", 12, njunsolstice);
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REPLACE("DecSolstice=", 12, ndecsolstice);
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if (strncmp(buf, "SEQUENCE=", 9) == 0) {
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setnsequences(buf + 9);
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continue;
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}
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/*
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* If the line starts with a tab, the data has to be
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* added to the previous line
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*/
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if (buf[0] == '\t') {
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for (i = 0; i < count; i++)
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event_continue(events[i], buf);
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continue;
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}
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/* Get rid of leading spaces (non-standard) */
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while (isspace((unsigned char)buf[0]))
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memcpy(buf, buf + 1, strlen(buf));
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/* No tab in the line, then not a valid line */
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if ((pp = strchr(buf, '\t')) == NULL)
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continue;
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/* Trim spaces in front of the tab */
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while (isspace((unsigned char)pp[-1]))
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pp--;
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p = *pp;
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*pp = '\0';
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if ((count = parsedaymonth(buf, year, month, day, &flags,
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extradata)) == 0)
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continue;
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*pp = p;
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if (count < 0) {
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/* Show error status based on return value */
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if (debug)
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fprintf(stderr, "Ignored: %s\n", buf);
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if (count == -1)
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continue;
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count = -count + 1;
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}
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/* Find the last tab */
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while (pp[1] == '\t')
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pp++;
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if (d_first < 0)
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d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
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for (i = 0; i < count; i++) {
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tm.tm_mon = month[i] - 1;
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tm.tm_mday = day[i];
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tm.tm_year = year[i] - 1900;
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(void)strftime(dbuf, sizeof(dbuf),
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d_first ? "%e %b" : "%b %e", &tm);
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if (debug)
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fprintf(stderr, "got %s\n", pp);
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events[i] = event_add(year[i], month[i], day[i], dbuf,
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((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
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extradata[i]);
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}
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}
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free(line);
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fclose(in);
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return (0);
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}
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void
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cal(void)
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{
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FILE *fpin;
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FILE *fpout;
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int i;
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for (i = 0; i < MAXCOUNT; i++)
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extradata[i] = (char *)calloc(1, 20);
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if ((fpin = opencalin()) == NULL)
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return;
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if ((fpout = opencalout()) == NULL) {
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fclose(fpin);
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return;
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}
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if (cal_parse(fpin, fpout))
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return;
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event_print_all(fpout);
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closecal(fpout);
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}
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FILE *
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opencalin(void)
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{
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struct stat sbuf;
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FILE *fpin;
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/* open up calendar file */
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if ((fpin = fopen(calendarFile, "r")) == NULL) {
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if (doall) {
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if (chdir(calendarHomes[0]) != 0)
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return (NULL);
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if (stat(calendarNoMail, &sbuf) == 0)
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return (NULL);
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if ((fpin = fopen(calendarFile, "r")) == NULL)
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return (NULL);
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} else {
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fpin = cal_fopen(calendarFile);
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}
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}
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return (fpin);
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}
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FILE *
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opencalout(void)
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{
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int fd;
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/* not reading all calendar files, just set output to stdout */
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if (!doall)
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return (stdout);
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/* set output to a temporary file, so if no output don't send mail */
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snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
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if ((fd = mkstemp(path)) < 0)
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return (NULL);
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return (fdopen(fd, "w+"));
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}
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void
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closecal(FILE *fp)
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{
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struct stat sbuf;
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int nread, pdes[2], status;
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char buf[1024];
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if (!doall)
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return;
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rewind(fp);
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if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
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goto done;
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if (pipe(pdes) < 0)
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goto done;
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switch (fork()) {
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case -1: /* error */
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(void)close(pdes[0]);
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(void)close(pdes[1]);
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goto done;
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case 0:
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/* child -- set stdin to pipe output */
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if (pdes[0] != STDIN_FILENO) {
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(void)dup2(pdes[0], STDIN_FILENO);
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(void)close(pdes[0]);
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}
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(void)close(pdes[1]);
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execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
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"\"Reminder Service\"", (char *)NULL);
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warn(_PATH_SENDMAIL);
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_exit(1);
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}
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/* parent -- write to pipe input */
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(void)close(pdes[0]);
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write(pdes[1], "From: \"Reminder Service\" <", 26);
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write(pdes[1], pw->pw_name, strlen(pw->pw_name));
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write(pdes[1], ">\nTo: <", 7);
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write(pdes[1], pw->pw_name, strlen(pw->pw_name));
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write(pdes[1], ">\nSubject: ", 11);
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write(pdes[1], dayname, strlen(dayname));
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write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
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while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
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(void)write(pdes[1], buf, nread);
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(void)close(pdes[1]);
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done: (void)fclose(fp);
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(void)unlink(path);
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while (wait(&status) >= 0);
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}
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