2BSD/src/Mail/collect.c
/* Copyright (c) 1979 Regents of the University of California */
#
/*
* Mail -- a mail program
*
* Collect input from standard input, handling
* ~ escapes.
*/
#include "rcv.h"
#include <sys/stat.h>
/*
* Read a message from standard output and return a read file to it
* or NULL on error.
*/
/*
* The following hokiness with global variables is so that on
* receipt of an interrupt signal, the partial message can be salted
* away on dead.letter. The output file must be available to flush,
* and the input to read. Several open files could be saved all through
* Mail if stdio allowed simultaneous read/write access.
*/
static int (*savesig)(); /* Previous SIGINT value */
static FILE *newi; /* File for saving away */
static FILE *newo; /* Output side of same */
static int hf; /* Ignore interrups */
FILE *
collect(hp)
struct header *hp;
{
FILE *ibuf, *fbuf, *obuf;
int lc, cc, escape, collrub(), intack();
register int c, t;
char linebuf[LINESIZE], *cp;
extern char tempMail[];
if (value("ignore") != NOSTR)
hf = 1;
else
hf = 0;
if ((savesig = signal(SIGINT, SIG_IGN)) != SIG_IGN)
signal(SIGINT, hf ? intack : collrub);
newi = NULL;
newo = NULL;
if ((obuf = fopen(tempMail, "w")) == NULL) {
perror(tempMail);
goto err;
}
newo = obuf;
if ((ibuf = fopen(tempMail, "r")) == NULL) {
perror(tempMail);
newo = NULL;
fclose(obuf);
goto err;
}
newi = ibuf;
unlink(tempMail);
if (hp->h_seq != 0) {
puthead(hp, stdout);
fflush(stdout);
}
if (intty && hp->h_subj == NOSTR && value("ask"))
grabh(hp, GSUBJ);
escape = ESCAPE;
if ((cp = value("escape")) != NOSTR)
escape = *cp;
while (readline(stdin, linebuf) > 0) {
if (linebuf[0] != escape) {
if ((t = putline(obuf, linebuf)) < 0)
goto err;
continue;
}
c = linebuf[1];
switch (c) {
default:
/*
* On double escape, just send the single one.
* Otherwise, it's an error.
*/
if (c == escape) {
if (putline(obuf, &linebuf[1]) < 0)
goto err;
else
break;
}
printf("Unknown tilde escape.\n");
break;
case 'C':
/*
* Dump core.
*/
core();
break;
case '!':
/*
* Shell escape, send the balance of the
* line to sh -c.
*/
shell(&linebuf[2]);
break;
case '.':
/*
* Simulate end of file on input.
*/
goto eof;
case 'q':
case 'Q':
/*
* Force a quit of sending mail.
* Act like an interrupt happened.
*/
collrub(SIGINT);
exit(1);
case 'h':
/*
* Grab a bunch of headers.
*/
if (!intty || !outtty) {
printf("~h: no can do!?\n");
break;
}
grabh(hp, GTO|GSUBJ|GCC);
printf("(continue)\n");
break;
case 't':
/*
* Add to the To list.
*/
hp->h_to = addto(hp->h_to, &linebuf[2]);
hp->h_seq++;
break;
case 's':
/*
* Set the Subj list.
*/
cp = &linebuf[2];
while (any(*cp, " \t"))
cp++;
hp->h_subj = savestr(cp);
hp->h_seq++;
break;
case 'c':
/*
* Add to the CC list.
*/
hp->h_cc = addto(hp->h_cc, &linebuf[2]);
hp->h_seq++;
break;
case 'd':
copy(deadletter, &linebuf[2]);
/* fall into . . . */
case 'r':
/*
* Invoke a file:
* Search for the file name,
* then open it and copy the contents to obuf.
*/
cp = &linebuf[2];
while (any(*cp, " \t"))
cp++;
if (*cp == '\0') {
printf("Interpolate what file?\n");
break;
}
if (isdir(cp)) {
printf("%s: directory\n");
break;
}
if ((fbuf = fopen(cp, "r")) == NULL) {
perror(cp);
break;
}
printf("\"%s\" ", cp);
flush();
lc = 0;
cc = 0;
while (readline(fbuf, linebuf) > 0) {
lc++;
if ((t = putline(obuf, linebuf)) < 0) {
fclose(fbuf);
goto err;
}
cc += t;
}
fclose(fbuf);
printf("%d/%d\n", lc, cc);
break;
case 'w':
/*
* Write the message on a file.
*/
cp = &linebuf[2];
while (any(*cp, " \t"))
cp++;
if (*cp == '\0') {
fprintf(stderr, "Write what file!?\n");
break;
}
fflush(obuf);
rewind(ibuf);
exwrite(cp, ibuf, 1);
break;
case 'm':
/*
* Interpolate the named messages, if we
* are in receiving mail mode. Does the
* standard list processing garbage.
*/
if (!rcvmode) {
printf("No messages to send from!?!\n");
break;
}
cp = &linebuf[2];
while (any(*cp, " \t"))
cp++;
if (forward(cp, obuf) < 0)
goto err;
printf("(continue)\n");
break;
case '?':
if ((fbuf = fopen(THELPFILE, "r")) == NULL) {
printf("No help just now.\n");
break;
}
t = getc(fbuf);
while (t != -1) {
putchar(t);
t = getc(fbuf);
}
fclose(fbuf);
break;
case 'p':
/*
* Print out the current state of the
* message without altering anything.
*/
fflush(obuf);
rewind(ibuf);
printf("-------\nMessage contains:\n");
puthead(hp, stdout);
t = getc(ibuf);
while (t != EOF) {
putchar(t);
t = getc(ibuf);
}
printf("(continue)\n");
break;
case '^':
case '|':
/*
* Pipe message through command.
* Collect output as new message.
*/
obuf = mespipe(ibuf, obuf, &linebuf[2]);
newo = obuf;
ibuf = newi;
newi = ibuf;
printf("(continue)\n");
break;
case 'v':
case 'e':
/*
* Edit the current message.
* 'e' means to use EDITOR
* 'v' means to use VISUAL
*/
if ((obuf = mesedit(ibuf, obuf, c)) == NULL)
goto err;
newo = obuf;
ibuf = newi;
printf("(continue)\n");
break;
break;
}
flush();
}
eof:
fclose(obuf);
rewind(ibuf);
signal(SIGINT, savesig);
return(ibuf);
err:
fclose(ibuf);
fclose(obuf);
signal(SIGINT, savesig);
return(NULL);
}
/*
* Write a file, ex-like if f set.
*/
exwrite(name, ibuf, f)
char name[];
FILE *ibuf;
{
register FILE *of;
register int c;
long cc;
int lc;
struct stat junk;
if (stat(name, &junk) >= 0) {
fprintf(stderr, "%s: File exists\n", name);
return(-1);
}
if ((of = fopen(name, "w")) == NULL) {
perror(name);
return(-1);
}
lc = 0;
cc = 0;
if (f) {
printf("\"%s\" ", name);
fflush(stdout);
}
while ((c = getc(ibuf)) != EOF) {
cc++;
if (c == '\n')
lc++;
putc(c, of);
if (ferror(of)) {
perror(name);
fclose(of);
return(-1);
}
}
fclose(of);
printf("%d/%ld\n", lc, cc);
fflush(stdout);
return(0);
}
/*
* Edit the message being collected on ibuf and obuf.
* Write the message out onto some poorly-named temp file
* and point an editor at it.
*
* On return, make the edit file the new temp file.
*/
FILE *
mesedit(ibuf, obuf, c)
FILE *ibuf, *obuf;
{
int pid, s;
FILE *fbuf;
register int t;
int (*sig)();
struct stat sbuf;
extern char tempMail[], tempEdit[];
register char *edit;
sig = signal(SIGINT, SIG_IGN);
if (stat(tempEdit, &sbuf) >= 0) {
printf("%s: file exists\n", tempEdit);
goto out;
}
close(creat(tempEdit, 0600));
if ((fbuf = fopen(tempEdit, "w")) == NULL) {
perror(tempEdit);
goto out;
}
fflush(obuf);
rewind(ibuf);
t = getc(ibuf);
while (t != EOF) {
putc(t, fbuf);
t = getc(ibuf);
}
fflush(fbuf);
if (ferror(fbuf)) {
perror(tempEdit);
unlink(tempEdit);
goto fix;
}
fclose(fbuf);
pid = fork();
if (pid == 0) {
if (sig != SIG_IGN)
signal(SIGINT, SIG_DFL);
if ((edit = value(c == 'e' ? "EDITOR" : "VISUAL")) == NOSTR)
edit = c == 'e' ? EDITOR : VISUAL;
execl(edit, edit, tempEdit, 0);
perror(edit);
exit(1);
}
if (pid == -1) {
perror("fork");
unlink(tempEdit);
goto out;
}
while (wait(&s) != pid)
;
if (s != 0) {
printf("Fatal error in \"%s\"\n", EDITOR);
unlink(tempEdit);
goto out;
}
/*
* Now switch to new file.
*/
if ((fbuf = fopen(tempEdit, "a")) == NULL) {
perror(tempEdit);
unlink(tempEdit);
goto out;
}
if ((ibuf = fopen(tempEdit, "r")) == NULL) {
perror(tempEdit);
fclose(fbuf);
unlink(tempEdit);
goto out;
}
unlink(tempEdit);
fclose(obuf);
fclose(newi);
obuf = fbuf;
goto out;
fix:
perror(tempEdit);
out:
signal(SIGINT, sig);
newi = ibuf;
return(obuf);
}
/*
* Pipe the message through the command.
* Old message is on stdin of command;
* New message collected from stdout.
* Sh -c must return 0 to accept the new message.
*/
FILE *
mespipe(ibuf, obuf, cmd)
FILE *ibuf, *obuf;
char cmd[];
{
register FILE *ni, *no;
int pid, s;
int (*savesig)();
char *Shell;
newi = ibuf;
if ((no = fopen(tempEdit, "w")) == NULL) {
perror(tempEdit);
return(obuf);
}
if ((ni = fopen(tempEdit, "r")) == NULL) {
perror(tempEdit);
fclose(no);
unlink(tempEdit);
return(obuf);
}
unlink(tempEdit);
savesig = signal(SIGINT, SIG_IGN);
fflush(obuf);
rewind(ibuf);
if ((Shell = value("SHELL")) == NULL)
Shell = "/bin/sh";
if ((pid = fork()) == -1) {
perror("fork");
goto err;
}
if (pid == 0) {
/*
* stdin = current message.
* stdout = new message.
*/
close(0);
dup(fileno(ibuf));
close(1);
dup(fileno(no));
for (s = 4; s < 15; s++)
close(s);
execl(Shell, Shell, "-c", cmd, 0);
perror(Shell);
exit(1);
}
while (wait(&s) != pid)
;
if (s != 0) {
fprintf(stderr, "\"%s\" failed!?\n", cmd);
goto err;
}
if (fsize(ni) == 0) {
fprintf(stderr, "No bytes from \"%s\" !?\n", cmd);
goto err;
}
/*
* Take new files.
*/
newi = ni;
fclose(ibuf);
fclose(obuf);
signal(SIGINT, savesig);
return(no);
err:
fclose(no);
fclose(ni);
signal(SIGINT, savesig);
return(obuf);
}
/*
* Interpolate the named messages into the current
* message, preceding each line with a tab.
* Return a count of the number of characters now in
* the message, or -1 if an error is encountered writing
* the message temporary.
*/
forward(ms, obuf)
char ms[];
FILE *obuf;
{
register int *msgvec, *ip;
extern char tempMail[];
msgvec = (int *) salloc((msgCount+1) * sizeof *msgvec);
if (msgvec == (int *) NOSTR)
return(0);
if (getmsglist(ms, msgvec, 0) < 0)
return(0);
if (*msgvec == NULL) {
*msgvec = first(0, MMNORM);
if (*msgvec == NULL) {
printf("No appropriate messages\n");
return(0);
}
msgvec[1] = NULL;
}
printf("Interpolating:");
for (ip = msgvec; *ip != NULL; ip++) {
touch(*ip);
printf(" %d", *ip);
if (transmit(&message[*ip-1], obuf) < 0) {
perror(tempMail);
return(-1);
}
}
printf("\n");
return(0);
}
/*
* Send message described by the passed pointer to the
* passed output buffer. Insert a tab in front of each
* line. Return a count of the characters sent, or -1
* on error.
*/
transmit(mailp, obuf)
struct message *mailp;
FILE *obuf;
{
register struct message *mp;
register int c, ch;
int n, bol;
FILE *ibuf;
mp = mailp;
ibuf = setinput(mp);
c = msize(mp);
n = c;
bol = 1;
while (c-- > 0) {
if (bol) {
bol = 0;
putc('\t', obuf);
n++;
if (ferror(obuf)) {
perror("/tmp");
return(-1);
}
}
ch = getc(ibuf);
if (ch == '\n')
bol++;
putc(ch, obuf);
if (ferror(obuf)) {
perror("/tmp");
return(-1);
}
}
return(n);
}
/*
* On interrupt, go here to save the partial
* message on #/dead.letter.
* Then restore signals and execute the normal
* signal routine. We only come here if signals
* were previously set anyway.
*/
collrub(s)
{
register FILE *dbuf;
register int c;
signal(SIGINT, SIG_IGN);
fclose(newo);
rewind(newi);
if (value("save") == NOSTR)
goto done;
if ((dbuf = fopen(deadletter, "w")) == NULL)
goto done;
chmod(deadletter, 0600);
while ((c = getc(newi)) != EOF)
putc(c, dbuf);
fclose(dbuf);
done:
fclose(newi);
signal(SIGINT, savesig);
if (rcvmode)
stop();
else
exit(1);
}
/*
* Acknowledge an interrupt signal from the tty by typing an @
*/
intack(s)
{
signal(SIGINT, SIG_IGN);
putchar('@');
fflush(stdout);
clearerr(stdin);
signal(SIGINT, intack);
}
/*
* Add a string to the end of a header entry field.
*/
char *
addto(hf, news)
char hf[], news[];
{
register char *cp, *cp2, *linebuf;
if (hf == NOSTR)
hf = "";
linebuf = salloc(strlen(hf) + strlen(news) + 1);
for (cp = hf; any(*cp, " \t"); cp++)
;
for (cp2 = linebuf; *cp;)
*cp2++ = *cp++;
*cp2++ = ' ';
for (cp = news; any(*cp, " \t"); cp++)
;
while (*cp != '\0')
*cp2++ = *cp++;
*cp2 = '\0';
return(linebuf);
}