4.3BSD-Reno/src/usr.bin/mail/lex.c
/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)lex.c 5.21 (Berkeley) 6/25/90";
#endif /* not lint */
#include "rcv.h"
#include <sys/stat.h>
#include <errno.h>
/*
* Mail -- a mail program
*
* Lexical processing of commands.
*/
char *prompt = "& ";
/*
* Set up editing on the given file name.
* If the first character of name is %, we are considered to be
* editing the file, otherwise we are reading our mail which has
* signficance for mbox and so forth.
*/
setfile(name)
char *name;
{
FILE *ibuf;
int i;
struct stat stb;
char isedit = *name != '%';
char *who = name[1] ? name + 1 : myname;
static int shudclob;
extern char tempMesg[];
extern int errno;
if ((name = expand(name)) == NOSTR)
return -1;
if ((ibuf = Fopen(name, "r")) == NULL) {
if (!isedit && errno == ENOENT)
goto nomail;
perror(name);
return(-1);
}
if (fstat(fileno(ibuf), &stb) < 0) {
perror("fstat");
Fclose(ibuf);
return (-1);
}
switch (stb.st_mode & S_IFMT) {
case S_IFDIR:
Fclose(ibuf);
errno = EISDIR;
perror(name);
return (-1);
case S_IFREG:
break;
default:
Fclose(ibuf);
errno = EINVAL;
perror(name);
return (-1);
}
/*
* Looks like all will be well. We must now relinquish our
* hold on the current set of stuff. Must hold signals
* while we are reading the new file, else we will ruin
* the message[] data structure.
*/
holdsigs();
if (shudclob)
quit();
/*
* Copy the messages into /tmp
* and set pointers.
*/
readonly = 0;
if ((i = open(name, 1)) < 0)
readonly++;
else
close(i);
if (shudclob) {
fclose(itf);
fclose(otf);
}
shudclob = 1;
edit = isedit;
strcpy(prevfile, mailname);
if (name != mailname)
strcpy(mailname, name);
mailsize = fsize(ibuf);
if ((otf = fopen(tempMesg, "w")) == NULL) {
perror(tempMesg);
exit(1);
}
if ((itf = fopen(tempMesg, "r")) == NULL) {
perror(tempMesg);
exit(1);
}
remove(tempMesg);
setptr(ibuf);
setmsize(msgCount);
Fclose(ibuf);
relsesigs();
sawcom = 0;
if (!edit && msgCount == 0) {
nomail:
fprintf(stderr, "No mail for %s\n", who);
return -1;
}
return(0);
}
int *msgvec;
int reset_on_stop; /* do a reset() if stopped */
/*
* Interpret user commands one by one. If standard input is not a tty,
* print no prompt.
*/
commands()
{
int eofloop = 0;
register int n;
char linebuf[LINESIZE];
int intr(), stop(), hangup(), contin();
if (!sourcing) {
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, intr);
if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
signal(SIGHUP, hangup);
signal(SIGTSTP, stop);
signal(SIGTTOU, stop);
signal(SIGTTIN, stop);
}
setexit();
for (;;) {
/*
* Print the prompt, if needed. Clear out
* string space, and flush the output.
*/
if (!sourcing && value("interactive") != NOSTR) {
reset_on_stop = 1;
printf(prompt);
}
fflush(stdout);
sreset();
/*
* Read a line of commands from the current input
* and handle end of file specially.
*/
n = 0;
for (;;) {
if (readline(input, &linebuf[n], LINESIZE - n) < 0) {
if (n == 0)
n = -1;
break;
}
if ((n = strlen(linebuf)) == 0)
break;
n--;
if (linebuf[n] != '\\')
break;
linebuf[n++] = ' ';
}
reset_on_stop = 0;
if (n < 0) {
/* eof */
if (loading)
break;
if (sourcing) {
unstack();
continue;
}
if (value("interactive") != NOSTR &&
value("ignoreeof") != NOSTR &&
++eofloop < 25) {
printf("Use \"quit\" to quit.\n");
continue;
}
break;
}
eofloop = 0;
if (execute(linebuf, 0))
break;
}
}
/*
* Execute a single command.
* Command functions return 0 for success, 1 for error, and -1
* for abort. A 1 or -1 aborts a load or source. A -1 aborts
* the interactive command loop.
* Contxt is non-zero if called while composing mail.
*/
execute(linebuf, contxt)
char linebuf[];
{
char word[LINESIZE];
char *arglist[MAXARGC];
struct cmd *com;
register char *cp, *cp2;
register int c;
int muvec[2];
int e = 1;
/*
* Strip the white space away from the beginning
* of the command, then scan out a word, which
* consists of anything except digits and white space.
*
* Handle ! escapes differently to get the correct
* lexical conventions.
*/
for (cp = linebuf; isspace(*cp); cp++)
;
if (*cp == '!') {
if (sourcing) {
printf("Can't \"!\" while sourcing\n");
goto out;
}
shell(cp+1);
return(0);
}
cp2 = word;
while (*cp && index(" \t0123456789$^.:/-+*'\"", *cp) == NOSTR)
*cp2++ = *cp++;
*cp2 = '\0';
/*
* Look up the command; if not found, bitch.
* Normally, a blank command would map to the
* first command in the table; while sourcing,
* however, we ignore blank lines to eliminate
* confusion.
*/
if (sourcing && *word == '\0')
return(0);
com = lex(word);
if (com == NONE) {
printf("Unknown command: \"%s\"\n", word);
goto out;
}
/*
* See if we should execute the command -- if a conditional
* we always execute it, otherwise, check the state of cond.
*/
if ((com->c_argtype & F) == 0)
if (cond == CRCV && !rcvmode || cond == CSEND && rcvmode)
return(0);
/*
* Process the arguments to the command, depending
* on the type he expects. Default to an error.
* If we are sourcing an interactive command, it's
* an error.
*/
if (!rcvmode && (com->c_argtype & M) == 0) {
printf("May not execute \"%s\" while sending\n",
com->c_name);
goto out;
}
if (sourcing && com->c_argtype & I) {
printf("May not execute \"%s\" while sourcing\n",
com->c_name);
goto out;
}
if (readonly && com->c_argtype & W) {
printf("May not execute \"%s\" -- message file is read only\n",
com->c_name);
goto out;
}
if (contxt && com->c_argtype & R) {
printf("Cannot recursively invoke \"%s\"\n", com->c_name);
goto out;
}
switch (com->c_argtype & ~(F|P|I|M|T|W|R)) {
case MSGLIST:
/*
* A message list defaulting to nearest forward
* legal message.
*/
if (msgvec == 0) {
printf("Illegal use of \"message list\"\n");
break;
}
if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0)
break;
if (c == 0) {
*msgvec = first(com->c_msgflag,
com->c_msgmask);
msgvec[1] = NULL;
}
if (*msgvec == NULL) {
printf("No applicable messages\n");
break;
}
e = (*com->c_func)(msgvec);
break;
case NDMLIST:
/*
* A message list with no defaults, but no error
* if none exist.
*/
if (msgvec == 0) {
printf("Illegal use of \"message list\"\n");
break;
}
if (getmsglist(cp, msgvec, com->c_msgflag) < 0)
break;
e = (*com->c_func)(msgvec);
break;
case STRLIST:
/*
* Just the straight string, with
* leading blanks removed.
*/
while (isspace(*cp))
cp++;
e = (*com->c_func)(cp);
break;
case RAWLIST:
/*
* A vector of strings, in shell style.
*/
if ((c = getrawlist(cp, arglist,
sizeof arglist / sizeof *arglist)) < 0)
break;
if (c < com->c_minargs) {
printf("%s requires at least %d arg(s)\n",
com->c_name, com->c_minargs);
break;
}
if (c > com->c_maxargs) {
printf("%s takes no more than %d arg(s)\n",
com->c_name, com->c_maxargs);
break;
}
e = (*com->c_func)(arglist);
break;
case NOLIST:
/*
* Just the constant zero, for exiting,
* eg.
*/
e = (*com->c_func)(0);
break;
default:
panic("Unknown argtype");
}
out:
/*
* Exit the current source file on
* error.
*/
if (e) {
if (e < 0)
return 1;
if (loading)
return 1;
if (sourcing)
unstack();
return 0;
}
if (value("autoprint") != NOSTR && com->c_argtype & P)
if ((dot->m_flag & MDELETED) == 0) {
muvec[0] = dot - &message[0] + 1;
muvec[1] = 0;
type(muvec);
}
if (!sourcing && (com->c_argtype & T) == 0)
sawcom = 1;
return(0);
}
/*
* Set the size of the message vector used to construct argument
* lists to message list functions.
*/
setmsize(sz)
{
if (msgvec != 0)
cfree((char *) msgvec);
msgvec = (int *) calloc((unsigned) (sz + 1), sizeof *msgvec);
}
/*
* Find the correct command in the command table corresponding
* to the passed command "word"
*/
struct cmd *
lex(word)
char word[];
{
register struct cmd *cp;
extern struct cmd cmdtab[];
for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++)
if (isprefix(word, cp->c_name))
return(cp);
return(NONE);
}
/*
* Determine if as1 is a valid prefix of as2.
* Return true if yep.
*/
isprefix(as1, as2)
char *as1, *as2;
{
register char *s1, *s2;
s1 = as1;
s2 = as2;
while (*s1++ == *s2)
if (*s2++ == '\0')
return(1);
return(*--s1 == '\0');
}
/*
* The following gets called on receipt of an interrupt. This is
* to abort printout of a command, mainly.
* Dispatching here when command() is inactive crashes rcv.
* Close all open files except 0, 1, 2, and the temporary.
* Also, unstack all source files.
*/
int inithdr; /* am printing startup headers */
/*ARGSUSED*/
intr(s)
{
noreset = 0;
if (!inithdr)
sawcom++;
inithdr = 0;
while (sourcing)
unstack();
close_all_files();
if (image >= 0) {
close(image);
image = -1;
}
fprintf(stderr, "Interrupt\n");
reset(0);
}
/*
* When we wake up after ^Z, reprint the prompt.
*/
stop(s)
{
sig_t old_action = signal(s, SIG_DFL);
sigsetmask(sigblock(0) & ~sigmask(s));
kill(0, s);
sigblock(sigmask(s));
signal(s, old_action);
if (reset_on_stop) {
reset_on_stop = 0;
reset(0);
}
}
/*
* Branch here on hangup signal and simulate "exit".
*/
/*ARGSUSED*/
hangup(s)
{
/* nothing to do? */
exit(1);
}
/*
* Announce the presence of the current Mail version,
* give the message count, and print a header listing.
*/
announce()
{
int vec[2], mdot;
mdot = newfileinfo();
vec[0] = mdot;
vec[1] = 0;
dot = &message[mdot - 1];
if (msgCount > 0 && value("noheader") == NOSTR) {
inithdr++;
headers(vec);
inithdr = 0;
}
}
/*
* Announce information about the file we are editing.
* Return a likely place to set dot.
*/
newfileinfo()
{
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*/
pversion(e)
{
extern char *version;
printf("Version %s\n", version);
return(0);
}
/*
* Load a file of user definitions.
*/
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);
}