NetBSD-5.0.2/usr.bin/mail/lex.c
/* $NetBSD: lex.c,v 1.36 2007/12/17 22:06:00 christos Exp $ */
/*
* Copyright (c) 1980, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)lex.c 8.2 (Berkeley) 4/20/95";
#else
__RCSID("$NetBSD: lex.c,v 1.36 2007/12/17 22:06:00 christos Exp $");
#endif
#endif /* not lint */
#include <assert.h>
#include "rcv.h"
#include <util.h>
#include "extern.h"
#ifdef USE_EDITLINE
#include "complete.h"
#endif
#include "format.h"
#include "thread.h"
/*
* Mail -- a mail program
*
* Lexical processing of commands.
*/
static const char *prompt = DEFAULT_PROMPT;
static int *msgvec;
static int reset_on_stop; /* do a reset() if stopped */
/*
* Set the size of the message vector used to construct argument
* lists to message list functions.
*/
static void
setmsize(int sz)
{
if (msgvec != 0)
free(msgvec);
msgvec = ecalloc((size_t) (sz + 1), sizeof(*msgvec));
}
/*
* 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.
*/
PUBLIC int
setfile(const char *name)
{
FILE *ibuf;
int i, fd;
struct stat stb;
char isedit = *name != '%' || getuserid(myname) != (int)getuid();
const char *who = name[1] ? name + 1 : myname;
static int shudclob;
char tempname[PATHSIZE];
if ((name = expand(name)) == NULL)
return -1;
if ((ibuf = Fopen(name, "r")) == NULL) {
if (!isedit && errno == ENOENT)
goto nomail;
warn("%s", name);
return -1;
}
if (fstat(fileno(ibuf), &stb) < 0) {
warn("fstat");
(void)Fclose(ibuf);
return -1;
}
switch (stb.st_mode & S_IFMT) {
case S_IFDIR:
(void)Fclose(ibuf);
errno = EISDIR;
warn("%s", name);
return -1;
case S_IFREG:
break;
default:
(void)Fclose(ibuf);
errno = EINVAL;
warn("%s", 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, O_WRONLY)) < 0)
readonly++;
else
(void)close(i);
if (shudclob) {
(void)fclose(itf);
(void)fclose(otf);
}
shudclob = 1;
edit = isedit;
(void)strcpy(prevfile, mailname);
if (name != mailname)
(void)strcpy(mailname, name);
mailsize = fsize(ibuf);
(void)snprintf(tempname, sizeof(tempname),
"%s/mail.RxXXXXXXXXXX", tmpdir);
if ((fd = mkstemp(tempname)) == -1 ||
(otf = fdopen(fd, "w")) == NULL)
err(1, "%s", tempname);
(void)fcntl(fileno(otf), F_SETFD, FD_CLOEXEC);
if ((itf = fopen(tempname, "r")) == NULL)
err(1, "%s", tempname);
(void)fcntl(fileno(itf), F_SETFD, FD_CLOEXEC);
(void)rm(tempname);
setptr(ibuf, (off_t)0);
setmsize(get_abs_msgCount());
/*
* New mail may have arrived while we were reading
* the mail file, so reset mailsize to be where
* we really are in the file...
*/
mailsize = ftell(ibuf);
(void)Fclose(ibuf);
relsesigs();
sawcom = 0;
if (!edit && get_abs_msgCount() == 0) {
nomail:
(void)fprintf(stderr, "No mail for %s\n", who);
return -1;
}
return 0;
}
/*
* Incorporate any new mail that has arrived since we first
* started reading mail.
*/
PUBLIC int
incfile(void)
{
off_t newsize;
int omsgCount;
FILE *ibuf;
int rval;
omsgCount = get_abs_msgCount();
ibuf = Fopen(mailname, "r");
if (ibuf == NULL)
return -1;
holdsigs();
newsize = fsize(ibuf);
if (newsize == 0 || /* mail box is now empty??? */
newsize < mailsize) { /* mail box has shrunk??? */
rval = -1;
goto done;
}
if (newsize == mailsize) {
rval = 0; /* no new mail */
goto done;
}
setptr(ibuf, mailsize); /* read in new mail */
setmsize(get_abs_msgCount()); /* get the new message count */
mailsize = ftell(ibuf);
rval = get_abs_msgCount() - omsgCount;
done:
(void)Fclose(ibuf);
relsesigs();
return rval;
}
/*
* Return a pointer to the comment character, respecting quoting as
* done in getrawlist(). The comment character is ignored inside
* quotes.
*/
static char *
comment_char(char *line)
{
char *p;
char quotec;
quotec = '\0';
for (p = line; *p; p++) {
if (quotec != '\0') {
if (*p == quotec)
quotec = '\0';
}
else if (*p == '"' || *p == '\'')
quotec = *p;
else if (*p == COMMENT_CHAR)
return p;
}
return NULL;
}
/*
* When we wake up after ^Z, reprint the prompt.
*/
static void
stop(int s)
{
sig_t old_action = signal(s, SIG_DFL);
sigset_t nset;
(void)sigemptyset(&nset);
(void)sigaddset(&nset, s);
(void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
(void)kill(0, s);
(void)sigprocmask(SIG_BLOCK, &nset, NULL);
(void)signal(s, old_action);
if (reset_on_stop) {
reset_on_stop = 0;
reset(0);
}
}
/*
* Signal handler is hooked by setup_piping().
* Respond to a broken pipe signal --
* probably caused by quitting more.
*/
static jmp_buf pipestop;
/*ARGSUSED*/
static void
brokpipe(int signo __unused)
{
longjmp(pipestop, 1);
}
/*
* Check the command line for any requested piping or redirection,
* depending on the value of 'c'. If "enable-pipes" is set, search
* the command line (cp) for the first occurrence of the character 'c'
* that is not in a quote or (parenthese) group.
*/
PUBLIC char *
shellpr(char *cp)
{
int quotec;
int level;
if (cp == NULL || value(ENAME_ENABLE_PIPES) == NULL)
return NULL;
level = 0;
quotec = 0;
for (/*EMPTY*/; *cp != '\0'; cp++) {
if (quotec) {
if (*cp == quotec)
quotec = 0;
if (*cp == '\\' &&
(cp[1] == quotec || cp[1] == '\\'))
cp++;
}
else {
switch (*cp) {
case '|':
case '>':
if (level == 0)
return cp;
break;
case '(':
level++;
break;
case ')':
level--;
break;
case '"':
case '\'':
quotec = *cp;
break;
default:
break;
}
}
}
return NULL;
}
/*
* Setup any pipe or redirection that the command line indicates.
* If none, then setup the pager unless "pager-off" is defined.
*/
static FILE *fp_stop = NULL;
static int oldfd1 = -1;
static int
setup_piping(char *cmdline, int c_pipe)
{
FILE *fout;
FILE *last_file;
char *cp;
last_file = last_registered_file(0);
fout = NULL;
if ((cp = shellpr(cmdline)) != NULL) {
char c;
c = *cp;
*cp = '\0';
cp++;
if (c == '|') {
if ((fout = Popen(cp, "w")) == NULL) {
warn("Popen: %s", cp);
return -1;
}
}
else {
const char *mode;
assert(c == '>');
mode = *cp == '>' ? "a" : "w";
if (*cp == '>')
cp++;
cp = skip_WSP(cp);
if ((fout = Fopen(cp, mode)) == NULL) {
warn("Fopen: %s", cp);
return -1;
}
}
}
else if (value(ENAME_PAGER_OFF) == NULL && (c_pipe & C_PIPE_PAGER ||
(c_pipe & C_PIPE_CRT && value(ENAME_CRT) != NULL))) {
const char *pager;
pager = value(ENAME_PAGER);
if (pager == NULL || *pager == '\0')
pager = _PATH_MORE;
if ((fout = Popen(pager, "w")) == NULL) {
warn("Popen: %s", pager);
return -1;
}
}
if (fout) {
(void)signal(SIGPIPE, brokpipe);
(void)fflush(stdout);
if ((oldfd1 = dup(STDOUT_FILENO)) == -1)
err(EXIT_FAILURE, "dup failed");
if (dup2(fileno(fout), STDOUT_FILENO) == -1)
err(EXIT_FAILURE, "dup2 failed");
fp_stop = last_file;
}
return 0;
}
/*
* This will close any piping started by setup_piping().
*/
static void
close_piping(void)
{
if (oldfd1 != -1) {
(void)fflush(stdout);
if (fileno(stdout) != oldfd1 &&
dup2(oldfd1, STDOUT_FILENO) == -1)
err(EXIT_FAILURE, "dup2 failed");
(void)signal(SIGPIPE, SIG_IGN);
close_top_files(fp_stop);
fp_stop = NULL;
(void)close(oldfd1);
oldfd1 = -1;
(void)signal(SIGPIPE, SIG_DFL);
}
}
/*
* Determine if as1 is a valid prefix of as2.
* Return true if yep.
*/
static int
isprefix(char *as1, const char *as2)
{
char *s1;
const char *s2;
s1 = as1;
s2 = as2;
while (*s1++ == *s2)
if (*s2++ == '\0')
return 1;
return *--s1 == '\0';
}
/*
* Find the correct command in the command table corresponding
* to the passed command "word"
*/
PUBLIC const struct cmd *
lex(char word[])
{
const struct cmd *cp;
for (cp = &cmdtab[0]; cp->c_name != NULL; cp++)
if (isprefix(word, cp->c_name))
return cp;
return NULL;
}
PUBLIC char *
get_cmdname(char *buf)
{
char *cp;
char *cmd;
size_t len;
for (cp = buf; *cp; cp++)
if (strchr(" \t0123456789$^.:/-+*'\">|", *cp) != NULL)
break;
/* XXX - Don't miss the pipe command! */
if (cp == buf && *cp == '|')
cp++;
len = cp - buf + 1;
cmd = salloc(len);
(void)strlcpy(cmd, buf, len);
return cmd;
}
/*
* 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.
* execute_contxt_e is in extern.h.
*/
PUBLIC int
execute(char linebuf[], enum execute_contxt_e contxt)
{
char *word;
char *arglist[MAXARGC];
const struct cmd *com = NULL;
char *volatile cp;
int c;
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.
*/
cp = skip_space(linebuf);
if (*cp == '!') {
if (sourcing) {
(void)printf("Can't \"!\" while sourcing\n");
goto out;
}
(void)shell(cp + 1);
return 0;
}
word = get_cmdname(cp);
cp += strlen(word);
/*
* 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 == NULL) {
(void)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 && (cond & CSKIP))
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 (mailmode == mm_sending && (com->c_argtype & M) == 0) {
(void)printf("May not execute \"%s\" while sending\n",
com->c_name);
goto out;
}
if (sourcing && com->c_argtype & I) {
(void)printf("May not execute \"%s\" while sourcing\n",
com->c_name);
goto out;
}
if (readonly && com->c_argtype & W) {
(void)printf("May not execute \"%s\" -- message file is read only\n",
com->c_name);
goto out;
}
if (contxt == ec_composing && com->c_argtype & R) {
(void)printf("Cannot recursively invoke \"%s\"\n", com->c_name);
goto out;
}
if (!sourcing && com->c_pipe && value(ENAME_INTERACTIVE) != NULL) {
if (setjmp(pipestop))
goto out;
if (setup_piping(cp, com->c_pipe) == -1)
goto out;
}
switch (com->c_argtype & ARGTYPE_MASK) {
case MSGLIST:
/*
* A message list defaulting to nearest forward
* legal message.
*/
if (msgvec == 0) {
(void)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] = 0;
}
if (*msgvec == 0) {
(void)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) {
(void)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.
*/
cp = skip_space(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) {
(void)printf("%s requires at least %d arg(s)\n",
com->c_name, com->c_minargs);
break;
}
if (c > com->c_maxargs) {
(void)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:
errx(1, "Unknown argtype");
}
out:
close_piping();
/*
* Exit the current source file on
* error.
*/
if (e) {
if (e < 0)
return 1;
if (loading)
return 1;
if (sourcing)
(void)unstack();
return 0;
}
if (com == NULL)
return 0;
if (contxt != ec_autoprint && com->c_argtype & P &&
value(ENAME_AUTOPRINT) != NULL && (dot->m_flag & MDELETED) == 0)
(void)execute(__UNCONST("print ."), ec_autoprint);
if (!sourcing && (com->c_argtype & T) == 0)
sawcom = 1;
return 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.
*/
static int inithdr; /* am printing startup headers */
/*ARGSUSED*/
static void
intr(int s __unused)
{
noreset = 0;
if (!inithdr)
sawcom++;
inithdr = 0;
while (sourcing)
(void)unstack();
close_piping();
close_all_files();
if (image >= 0) {
(void)close(image);
image = -1;
}
(void)fprintf(stderr, "Interrupt\n");
reset(0);
}
/*
* Branch here on hangup signal and simulate "exit".
*/
/*ARGSUSED*/
static void
hangup(int s __unused)
{
/* nothing to do? */
exit(1);
}
/*
* Interpret user commands one by one. If standard input is not a tty,
* print no prompt.
*/
PUBLIC void
commands(void)
{
int n;
char linebuf[LINESIZE];
int eofloop;
if (!sourcing) {
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
(void)signal(SIGINT, intr);
if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
(void)signal(SIGHUP, hangup);
(void)signal(SIGTSTP, stop);
(void)signal(SIGTTOU, stop);
(void)signal(SIGTTIN, stop);
}
setexit(); /* defined as (void)setjmp(srbuf) in def.h */
eofloop = 0; /* initialize this after a possible longjmp */
for (;;) {
(void)fflush(stdout);
sreset();
/*
* Print the prompt, if needed. Clear out
* string space, and flush the output.
*/
if (!sourcing && value(ENAME_INTERACTIVE) != NULL) {
if ((prompt = value(ENAME_PROMPT)) == NULL)
prompt = DEFAULT_PROMPT;
prompt = smsgprintf(prompt, dot);
if ((value(ENAME_AUTOINC) != NULL) && (incfile() > 0))
(void)printf("New mail has arrived.\n");
reset_on_stop = 1;
#ifndef USE_EDITLINE
(void)printf("%s", prompt);
#endif
}
/*
* Read a line of commands from the current input
* and handle end of file specially.
*/
n = 0;
for (;;) {
#ifdef USE_EDITLINE
if (!sourcing) {
char *line;
if ((line = my_gets(&elm.command, prompt, NULL)) == NULL) {
if (n == 0)
n = -1;
break;
}
(void)strlcpy(linebuf, line, sizeof(linebuf));
setscreensize(); /* so we can resize a window */
}
else {
if (mail_readline(input, &linebuf[n], LINESIZE - n) < 0) {
if (n == 0)
n = -1;
break;
}
}
#else /* USE_EDITLINE */
if (mail_readline(input, &linebuf[n], LINESIZE - n) < 0) {
if (n == 0)
n = -1;
break;
}
#endif /* USE_EDITLINE */
if (sourcing) { /* allow comments in source files */
char *ptr;
if ((ptr = comment_char(linebuf)) != NULL)
*ptr = '\0';
}
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) {
(void)unstack();
continue;
}
#ifdef USE_EDITLINE
{
char *p;
if (value(ENAME_INTERACTIVE) != NULL &&
(p = value(ENAME_IGNOREEOF)) != NULL &&
++eofloop < (*p == '\0' ? 25 : atoi(p))) {
(void)printf("Use \"quit\" to quit.\n");
continue;
}
}
#else
if (value(ENAME_INTERACTIVE) != NULL &&
value(ENAME_IGNOREEOF) != NULL &&
++eofloop < 25) {
(void)printf("Use \"quit\" to quit.\n");
continue;
}
#endif
break;
}
eofloop = 0;
if (execute(linebuf, ec_normal))
break;
}
}
/*
* Announce information about the file we are editing.
* Return a likely place to set dot.
*/
PUBLIC int
newfileinfo(int omsgCount)
{
struct message *mp;
int d, n, s, t, u, mdot;
char fname[PATHSIZE];
char *ename;
/*
* Figure out where to set the 'dot'. Use the first new or
* unread message.
*/
for (mp = get_abs_message(omsgCount + 1); mp;
mp = next_abs_message(mp))
if (mp->m_flag & MNEW)
break;
if (mp == NULL)
for (mp = get_abs_message(omsgCount + 1); mp;
mp = next_abs_message(mp))
if ((mp->m_flag & MREAD) == 0)
break;
if (mp != NULL)
mdot = get_msgnum(mp);
else
mdot = omsgCount + 1;
#ifdef THREAD_SUPPORT
/*
* See if the message is in the current thread.
*/
if (mp != NULL && get_message(1) != NULL && get_message(mdot) != mp)
mdot = 0;
#endif
/*
* Scan the message array counting the new, unread, deleted,
* and saved messages.
*/
d = n = s = t = u = 0;
for (mp = get_abs_message(1); mp; mp = next_abs_message(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++;
if (mp->m_flag & MTAGGED)
t++;
}
ename = mailname;
if (getfold(fname, sizeof(fname)) >= 0) {
char zname[PATHSIZE];
size_t l;
l = strlen(fname);
if (l < sizeof(fname) - 1)
fname[l++] = '/';
if (strncmp(fname, mailname, l) == 0) {
(void)snprintf(zname, sizeof(zname), "+%s",
mailname + l);
ename = zname;
}
}
/*
* Display the statistics.
*/
(void)printf("\"%s\": ", ename);
{
int cnt = get_abs_msgCount();
(void)printf("%d message%s", cnt, cnt == 1 ? "" : "s");
}
if (n > 0)
(void)printf(" %d new", n);
if (u-n > 0)
(void)printf(" %d unread", u);
if (t > 0)
(void)printf(" %d tagged", t);
if (d > 0)
(void)printf(" %d deleted", d);
if (s > 0)
(void)printf(" %d saved", s);
if (readonly)
(void)printf(" [Read only]");
(void)printf("\n");
return mdot;
}
/*
* Announce the presence of the current Mail version,
* give the message count, and print a header listing.
*/
PUBLIC void
announce(void)
{
int vec[2], mdot;
mdot = newfileinfo(0);
vec[0] = mdot;
vec[1] = 0;
if ((dot = get_message(mdot)) == NULL)
dot = get_abs_message(1); /* make sure we get something! */
if (get_abs_msgCount() > 0 && value(ENAME_NOHEADER) == NULL) {
inithdr++;
(void)headers(vec);
inithdr = 0;
}
}
/*
* Print the current version number.
*/
/*ARGSUSED*/
PUBLIC int
pversion(void *v __unused)
{
(void)printf("Version %s\n", version);
return 0;
}
/*
* Load a file of user definitions.
*/
PUBLIC void
load(const char *name)
{
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;
(void)Fclose(in);
}