Ultrix-3.1/src/ucb/Mail/lex.c
/**********************************************************************
* Copyright (c) Digital Equipment Corporation 1984, 1985, 1986. *
* All Rights Reserved. *
* Reference "/usr/src/COPYRIGHT" for applicable restrictions. *
**********************************************************************/
#ifndef lint
static char *Sccsid = "@(#)lex.c 3.0 4/22/86";
#endif
#include "rcv.h"
/*
* Mail -- a mail program
*
* Lexical processing of commands.
*/
/*
* Based on
* static char *SccsId = "@(#)lex.c 2.13 6/15/83";
*/
char *prompt = "& ";
/*
* Set up editing on the given file name.
* If isedit is true, we are considered to be editing the file,
* otherwise we are reading our mail which has signficance for
* mbox and so forth.
*/
setfile(name, isedit)
char *name;
{
FILE *ibuf;
int i;
static int shudclob;
static char efile[128];
extern char tempMesg[];
if ((ibuf = fopen(name, "r")) == NULL)
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) {
if (edit)
edstop();
else
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;
strncpy(efile, name, 128);
editfile = efile;
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;
return(0);
}
/*
* Interpret user commands one by one. If standard input is not a tty,
* print no prompt.
*/
int *msgvec;
commands()
{
int eofloop, shudprompt, stop();
register int n;
char linebuf[LINESIZE];
int hangup(), contin();
# ifdef VMUNIX
sigset(SIGCONT, SIG_DFL);
# endif VMUNIX
if (rcvmode && !sourcing) {
if (sigset(SIGINT, SIG_IGN) != SIG_IGN)
sigset(SIGINT, stop);
if (sigset(SIGHUP, SIG_IGN) != SIG_IGN)
sigset(SIGHUP, hangup);
}
shudprompt = intty && !sourcing;
for (;;) {
setexit();
/*
* Print the prompt, if needed. Clear out
* string space, and flush the output.
*/
if (!rcvmode && !sourcing)
return;
eofloop = 0;
top:
if (shudprompt) {
printf(prompt);
flush();
# ifdef VMUNIX
sigset(SIGCONT, contin);
# endif VMUNIX
} else
flush();
sreset();
/*
* Read a line of commands from the current input
* and handle end of file specially.
*/
n = 0;
for (;;) {
if (readline(input, &linebuf[n]) <= 0) {
if (n != 0)
break;
if (loading)
return;
if (sourcing) {
unstack();
goto more;
}
if (value("ignoreeof") != NOSTR && shudprompt) {
if (++eofloop < 25) {
printf("Use \"quit\" to quit.\n");
goto top;
}
}
if (edit)
edstop();
return;
}
if ((n = strlen(linebuf)) == 0)
break;
n--;
if (linebuf[n] != '\\')
break;
linebuf[n++] = ' ';
}
# ifdef VMUNIX
sigset(SIGCONT, SIG_DFL);
# endif VMUNIX
if (execute(linebuf, 0))
return;
more: ;
}
}
/*
* Execute a single command. If the command executed
* is "quit," then return non-zero so that the caller
* will know to return back to main, if he cares.
* 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 edstop(), e;
/*
* 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.
*/
cp = linebuf;
while (any(*cp, " \t"))
cp++;
if (*cp == '!') {
if (sourcing) {
printf("Can't \"!\" while sourcing\n");
unstack();
return(0);
}
shell(cp+1);
return(0);
}
cp2 = word;
while (*cp && !any(*cp, " \t0123456789$^.:/-+*'\""))
*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 && equal(word, ""))
return(0);
com = lex(word);
if (com == NONE) {
printf("Unknown command: \"%s\"\n", word);
if (loading)
return(1);
if (sourcing)
unstack();
return(0);
}
/*
* 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);
/*
* Special case so that quit causes a return to
* main, who will call the quit code directly.
* If we are in a source file, just unstack.
*/
if (com->c_func == edstop && sourcing) {
if (loading)
return(1);
unstack();
return(0);
}
if (!edit && com->c_func == edstop) {
sigset(SIGINT, SIG_IGN);
return(1);
}
/*
* 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);
if (loading)
return(1);
if (sourcing)
unstack();
return(0);
}
if (sourcing && com->c_argtype & I) {
printf("May not execute \"%s\" while sourcing\n",
com->c_name);
if (loading)
return(1);
unstack();
return(0);
}
if (readonly && com->c_argtype & W) {
printf("May not execute \"%s\" -- message file is read only\n",
com->c_name);
if (loading)
return(1);
if (sourcing)
unstack();
return(0);
}
if (contxt && com->c_argtype & R) {
printf("Cannot recursively invoke \"%s\"\n", com->c_name);
return(0);
}
e = 1;
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");
return(-1);
}
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");
return(-1);
}
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 (any(*cp, " \t"))
cp++;
e = (*com->c_func)(cp);
break;
case RAWLIST:
/*
* A vector of strings, in shell style.
*/
if ((c = getrawlist(cp, 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");
}
/*
* Exit the current source file on
* error.
*/
if (e && loading)
return(1);
if (e && sourcing)
unstack();
if (com->c_func == edstop)
return(1);
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);
}
/*
* When we wake up after ^Z, reprint the prompt.
*/
contin(s)
{
printf(prompt);
fflush(stdout);
}
/*
* Branch here on hangup signal and simulate quit.
*/
hangup()
{
holdsigs();
if (edit) {
if (setexit())
exit(0);
edstop();
}
else
quit();
exit(0);
}
/*
* Set the size of the message vector used to construct argument
* lists to message list functions.
*/
setmsize(sz)
{
if (msgvec != (int *) 0)
cfree(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 a rubout. 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.
* The special call to getuserid() is needed so it won't get
* annoyed about losing its open file.
* Also, unstack all source files.
*/
int inithdr; /* am printing startup headers */
stop(s)
{
register FILE *fp;
# ifndef VMUNIX
s = SIGINT;
signal(s, SIG_IGN); /* ignore ^C 'til done */
# endif VMUNIX
noreset = 0;
if (!inithdr)
sawcom++;
inithdr = 0;
while (sourcing)
unstack();
getuserid((char *) -1);
for (fp = &_iob[0]; fp < &_iob[_NFILE]; fp++) {
if (fp == stdin || fp == stdout)
continue;
if (fp == itf || fp == otf)
continue;
if (fp == stderr)
continue;
if (fp == pipef) {
pclose(pipef);
pipef = NULL;
continue;
}
fclose(fp);
}
if (image >= 0) {
close(image);
image = -1;
}
clrbuf(stdout);
printf("Interrupt\n");
# ifdef VMUNIX
sigrelse(s);
# else
signal(s, stop);
# endif
reset(0);
}
/*
* Announce the presence of the current Mail version,
* give the message count, and print a header listing.
*/
char *greeting = "Mail version %s. Type ? for help.\n";
extern char *version;
announce(pr)
{
int vec[2], mdot;
if (pr && value("quiet") == NOSTR)
printf(greeting, version);
mdot = newfileinfo();
vec[0] = mdot;
vec[1] = 0;
dot = &message[mdot - 1];
if (msgCount > 0 && !noheader) {
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);
}
strace() {}
/*
* Print the current version number.
*/
pversion(e)
{
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);
}