d030d2d2ae
plain 0 should be used. This happens to work because we #define NULL to 0, but is stylistically wrong and can cause problems for people trying to port bits of code to other environments. PR: 2752 Submitted by: Arne Henrik Juul <arnej@imf.unit.no>
677 lines
13 KiB
C
677 lines
13 KiB
C
/*
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* Copyright (c) 1980, 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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 char sccsid[] = "@(#)lex.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include "rcv.h"
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#include <errno.h>
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#include <fcntl.h>
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#include "extern.h"
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/*
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* Mail -- a mail program
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*
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* Lexical processing of commands.
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*/
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char *prompt = "& ";
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/*
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* Set up editing on the given file name.
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* If the first character of name is %, we are considered to be
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* editing the file, otherwise we are reading our mail which has
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* signficance for mbox and so forth.
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*/
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int
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setfile(name)
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char *name;
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{
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FILE *ibuf;
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int i;
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struct stat stb;
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char isedit = *name != '%';
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char *who = name[1] ? name + 1 : myname;
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static int shudclob;
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extern char tempMesg[];
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extern int errno;
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if ((name = expand(name)) == NOSTR)
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return -1;
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if ((ibuf = Fopen(name, "r")) == NULL) {
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if (!isedit && errno == ENOENT)
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goto nomail;
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perror(name);
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return(-1);
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}
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if (fstat(fileno(ibuf), &stb) < 0) {
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perror("fstat");
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Fclose(ibuf);
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return (-1);
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}
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switch (stb.st_mode & S_IFMT) {
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case S_IFDIR:
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Fclose(ibuf);
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errno = EISDIR;
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perror(name);
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return (-1);
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case S_IFREG:
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break;
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default:
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Fclose(ibuf);
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errno = EINVAL;
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perror(name);
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return (-1);
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}
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/*
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* Looks like all will be well. We must now relinquish our
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* hold on the current set of stuff. Must hold signals
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* while we are reading the new file, else we will ruin
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* the message[] data structure.
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*/
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holdsigs();
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if (shudclob)
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quit();
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/*
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* Copy the messages into /tmp
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* and set pointers.
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*/
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readonly = 0;
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if ((i = open(name, 1)) < 0)
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readonly++;
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else
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close(i);
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if (shudclob) {
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fclose(itf);
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fclose(otf);
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}
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shudclob = 1;
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edit = isedit;
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strcpy(prevfile, mailname);
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if (name != mailname)
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strcpy(mailname, name);
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mailsize = fsize(ibuf);
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if ((otf = fopen(tempMesg, "w")) == NULL) {
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perror(tempMesg);
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exit(1);
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}
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(void) fcntl(fileno(otf), F_SETFD, 1);
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if ((itf = fopen(tempMesg, "r")) == NULL) {
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perror(tempMesg);
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exit(1);
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}
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(void) fcntl(fileno(itf), F_SETFD, 1);
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rm(tempMesg);
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setptr(ibuf);
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setmsize(msgCount);
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Fclose(ibuf);
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relsesigs();
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sawcom = 0;
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if (!edit && msgCount == 0) {
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nomail:
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fprintf(stderr, "No mail for %s\n", who);
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return -1;
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}
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return(0);
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}
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int *msgvec;
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int reset_on_stop; /* do a reset() if stopped */
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/*
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* Interpret user commands one by one. If standard input is not a tty,
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* print no prompt.
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*/
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void
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commands()
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{
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int eofloop = 0;
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register int n;
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char linebuf[LINESIZE];
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void intr(), stop(), hangup();
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if (!sourcing) {
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if (signal(SIGINT, SIG_IGN) != SIG_IGN)
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signal(SIGINT, intr);
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if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
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signal(SIGHUP, hangup);
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signal(SIGTSTP, stop);
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signal(SIGTTOU, stop);
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signal(SIGTTIN, stop);
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}
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setexit();
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for (;;) {
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/*
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* Print the prompt, if needed. Clear out
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* string space, and flush the output.
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*/
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if (!sourcing && value("interactive") != NOSTR) {
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reset_on_stop = 1;
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printf(prompt);
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}
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fflush(stdout);
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sreset();
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/*
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* Read a line of commands from the current input
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* and handle end of file specially.
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*/
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n = 0;
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for (;;) {
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if (readline(input, &linebuf[n], LINESIZE - n) < 0) {
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if (n == 0)
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n = -1;
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break;
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}
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if ((n = strlen(linebuf)) == 0)
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break;
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n--;
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if (linebuf[n] != '\\')
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break;
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linebuf[n++] = ' ';
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}
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reset_on_stop = 0;
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if (n < 0) {
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/* eof */
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if (loading)
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break;
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if (sourcing) {
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unstack();
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continue;
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}
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if (value("interactive") != NOSTR &&
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value("ignoreeof") != NOSTR &&
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++eofloop < 25) {
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printf("Use \"quit\" to quit.\n");
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continue;
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}
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break;
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}
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eofloop = 0;
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if (execute(linebuf, 0))
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break;
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}
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}
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/*
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* Execute a single command.
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* Command functions return 0 for success, 1 for error, and -1
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* for abort. A 1 or -1 aborts a load or source. A -1 aborts
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* the interactive command loop.
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* Contxt is non-zero if called while composing mail.
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*/
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int
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execute(linebuf, contxt)
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char linebuf[];
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int contxt;
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{
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char word[LINESIZE];
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char *arglist[MAXARGC];
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struct cmd *com;
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register char *cp, *cp2;
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register int c;
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int muvec[2];
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int e = 1;
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/*
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* Strip the white space away from the beginning
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* of the command, then scan out a word, which
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* consists of anything except digits and white space.
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*
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* Handle ! escapes differently to get the correct
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* lexical conventions.
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*/
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for (cp = linebuf; isspace(*cp); cp++)
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;
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if (*cp == '!') {
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if (sourcing) {
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printf("Can't \"!\" while sourcing\n");
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goto out;
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}
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shell(cp+1);
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return(0);
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}
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cp2 = word;
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while (*cp && index(" \t0123456789$^.:/-+*'\"", *cp) == NOSTR)
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*cp2++ = *cp++;
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*cp2 = '\0';
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/*
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* Look up the command; if not found, bitch.
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* Normally, a blank command would map to the
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* first command in the table; while sourcing,
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* however, we ignore blank lines to eliminate
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* confusion.
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*/
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if (sourcing && *word == '\0')
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return(0);
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com = lex(word);
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if (com == NONE) {
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printf("Unknown command: \"%s\"\n", word);
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goto out;
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}
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/*
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* See if we should execute the command -- if a conditional
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* we always execute it, otherwise, check the state of cond.
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*/
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if ((com->c_argtype & F) == 0)
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if (cond == CRCV && !rcvmode || cond == CSEND && rcvmode)
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return(0);
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/*
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* Process the arguments to the command, depending
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* on the type he expects. Default to an error.
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* If we are sourcing an interactive command, it's
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* an error.
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*/
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if (!rcvmode && (com->c_argtype & M) == 0) {
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printf("May not execute \"%s\" while sending\n",
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com->c_name);
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goto out;
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}
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if (sourcing && com->c_argtype & I) {
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printf("May not execute \"%s\" while sourcing\n",
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com->c_name);
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goto out;
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}
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if (readonly && com->c_argtype & W) {
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printf("May not execute \"%s\" -- message file is read only\n",
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com->c_name);
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goto out;
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}
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if (contxt && com->c_argtype & R) {
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printf("Cannot recursively invoke \"%s\"\n", com->c_name);
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goto out;
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}
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switch (com->c_argtype & ~(F|P|I|M|T|W|R)) {
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case MSGLIST:
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/*
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* A message list defaulting to nearest forward
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* legal message.
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*/
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if (msgvec == 0) {
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printf("Illegal use of \"message list\"\n");
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break;
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}
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if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0)
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break;
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if (c == 0) {
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*msgvec = first(com->c_msgflag,
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com->c_msgmask);
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msgvec[1] = 0;
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}
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if (*msgvec == 0) {
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printf("No applicable messages\n");
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break;
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}
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e = (*com->c_func)(msgvec);
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break;
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case NDMLIST:
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/*
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* A message list with no defaults, but no error
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* if none exist.
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*/
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if (msgvec == 0) {
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printf("Illegal use of \"message list\"\n");
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break;
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}
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if (getmsglist(cp, msgvec, com->c_msgflag) < 0)
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break;
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e = (*com->c_func)(msgvec);
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break;
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case STRLIST:
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/*
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* Just the straight string, with
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* leading blanks removed.
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*/
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while (isspace(*cp))
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cp++;
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e = (*com->c_func)(cp);
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break;
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case RAWLIST:
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/*
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* A vector of strings, in shell style.
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*/
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if ((c = getrawlist(cp, arglist,
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sizeof arglist / sizeof *arglist)) < 0)
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break;
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if (c < com->c_minargs) {
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printf("%s requires at least %d arg(s)\n",
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com->c_name, com->c_minargs);
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break;
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}
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if (c > com->c_maxargs) {
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printf("%s takes no more than %d arg(s)\n",
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com->c_name, com->c_maxargs);
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break;
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}
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e = (*com->c_func)(arglist);
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break;
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case NOLIST:
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/*
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* Just the constant zero, for exiting,
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* eg.
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*/
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e = (*com->c_func)(0);
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break;
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default:
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panic("Unknown argtype");
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}
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out:
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/*
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* Exit the current source file on
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* error.
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*/
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if (e) {
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if (e < 0)
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return 1;
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if (loading)
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return 1;
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if (sourcing)
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unstack();
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return 0;
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}
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if (value("autoprint") != NOSTR && com->c_argtype & P)
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if ((dot->m_flag & MDELETED) == 0) {
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muvec[0] = dot - &message[0] + 1;
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muvec[1] = 0;
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type(muvec);
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}
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if (!sourcing && (com->c_argtype & T) == 0)
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sawcom = 1;
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return(0);
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}
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/*
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* Set the size of the message vector used to construct argument
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* lists to message list functions.
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*/
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void
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setmsize(sz)
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int sz;
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{
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if (msgvec != 0)
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free((char *) msgvec);
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msgvec = (int *) calloc((unsigned) (sz + 1), sizeof *msgvec);
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}
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/*
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* Find the correct command in the command table corresponding
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* to the passed command "word"
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*/
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struct cmd *
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lex(word)
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char word[];
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{
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register struct cmd *cp;
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extern struct cmd cmdtab[];
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/*
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* ignore trailing chars after `#'
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*
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* lines with beginning `#' are comments
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* spaces befor `#' are ignored in execute()
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*/
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if (*word == '#')
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*(word+1) = '\0';
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for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++)
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if (isprefix(word, cp->c_name))
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return(cp);
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return(NONE);
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}
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/*
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* Determine if as1 is a valid prefix of as2.
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* Return true if yep.
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*/
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int
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isprefix(as1, as2)
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char *as1, *as2;
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{
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register char *s1, *s2;
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s1 = as1;
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s2 = as2;
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while (*s1++ == *s2)
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if (*s2++ == '\0')
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return(1);
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return(*--s1 == '\0');
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}
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/*
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* The following gets called on receipt of an interrupt. This is
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* to abort printout of a command, mainly.
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* Dispatching here when command() is inactive crashes rcv.
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* Close all open files except 0, 1, 2, and the temporary.
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* Also, unstack all source files.
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*/
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int inithdr; /* am printing startup headers */
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/*ARGSUSED*/
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void
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intr(s)
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int s;
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{
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noreset = 0;
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if (!inithdr)
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sawcom++;
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inithdr = 0;
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while (sourcing)
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unstack();
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close_all_files();
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if (image >= 0) {
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close(image);
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image = -1;
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}
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fprintf(stderr, "Interrupt\n");
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reset(0);
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}
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/*
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* When we wake up after ^Z, reprint the prompt.
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*/
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void
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stop(s)
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int s;
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{
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sig_t old_action = signal(s, SIG_DFL);
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sigsetmask(sigblock(0) & ~sigmask(s));
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kill(0, s);
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sigblock(sigmask(s));
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signal(s, old_action);
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if (reset_on_stop) {
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reset_on_stop = 0;
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reset(0);
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}
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}
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/*
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* Branch here on hangup signal and simulate "exit".
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*/
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/*ARGSUSED*/
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void
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hangup(s)
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int s;
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{
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/* nothing to do? */
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exit(1);
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}
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|
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/*
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* Announce the presence of the current Mail version,
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* give the message count, and print a header listing.
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*/
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void
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announce()
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{
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int vec[2], mdot;
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mdot = newfileinfo();
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vec[0] = mdot;
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vec[1] = 0;
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dot = &message[mdot - 1];
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if (msgCount > 0 && value("noheader") == NOSTR) {
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inithdr++;
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headers(vec);
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inithdr = 0;
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}
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}
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/*
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* Announce information about the file we are editing.
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* Return a likely place to set dot.
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*/
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int
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newfileinfo()
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{
|
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register struct message *mp;
|
|
register int u, n, mdot, d, s;
|
|
char fname[BUFSIZ], zname[BUFSIZ], *ename;
|
|
|
|
for (mp = &message[0]; mp < &message[msgCount]; mp++)
|
|
if (mp->m_flag & MNEW)
|
|
break;
|
|
if (mp >= &message[msgCount])
|
|
for (mp = &message[0]; mp < &message[msgCount]; mp++)
|
|
if ((mp->m_flag & MREAD) == 0)
|
|
break;
|
|
if (mp < &message[msgCount])
|
|
mdot = mp - &message[0] + 1;
|
|
else
|
|
mdot = 1;
|
|
s = d = 0;
|
|
for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) {
|
|
if (mp->m_flag & MNEW)
|
|
n++;
|
|
if ((mp->m_flag & MREAD) == 0)
|
|
u++;
|
|
if (mp->m_flag & MDELETED)
|
|
d++;
|
|
if (mp->m_flag & MSAVED)
|
|
s++;
|
|
}
|
|
ename = mailname;
|
|
if (getfold(fname) >= 0) {
|
|
strcat(fname, "/");
|
|
if (strncmp(fname, mailname, strlen(fname)) == 0) {
|
|
sprintf(zname, "+%s", mailname + strlen(fname));
|
|
ename = zname;
|
|
}
|
|
}
|
|
printf("\"%s\": ", ename);
|
|
if (msgCount == 1)
|
|
printf("1 message");
|
|
else
|
|
printf("%d messages", msgCount);
|
|
if (n > 0)
|
|
printf(" %d new", n);
|
|
if (u-n > 0)
|
|
printf(" %d unread", u);
|
|
if (d > 0)
|
|
printf(" %d deleted", d);
|
|
if (s > 0)
|
|
printf(" %d saved", s);
|
|
if (readonly)
|
|
printf(" [Read only]");
|
|
printf("\n");
|
|
return(mdot);
|
|
}
|
|
|
|
/*
|
|
* Print the current version number.
|
|
*/
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
pversion(e)
|
|
int e;
|
|
{
|
|
extern char *version;
|
|
|
|
printf("Version %s\n", version);
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Load a file of user definitions.
|
|
*/
|
|
void
|
|
load(name)
|
|
char *name;
|
|
{
|
|
register FILE *in, *oldin;
|
|
|
|
if ((in = Fopen(name, "r")) == NULL)
|
|
return;
|
|
oldin = input;
|
|
input = in;
|
|
loading = 1;
|
|
sourcing = 1;
|
|
commands();
|
|
loading = 0;
|
|
sourcing = 0;
|
|
input = oldin;
|
|
Fclose(in);
|
|
}
|