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lex.c

/*    $OpenBSD: lex.c,v 1.32 2004/05/10 15:25:51 deraadt Exp $    */
/*    $NetBSD: lex.c,v 1.10 1997/05/17 19:55:13 pk 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.
 */

#ifndef lint
#if 0
static const char sccsid[] = "@(#)lex.c   8.2 (Berkeley) 4/20/95";
#else
static const char rcsid[] = "$OpenBSD: lex.c,v 1.32 2004/05/10 15:25:51 deraadt Exp $";
#endif
#endif /* not lint */

#include "rcv.h"
#include <errno.h>
#include <fcntl.h>
#include "extern.h"

/*
 * Mail -- a mail program
 *
 * Lexical processing of commands.
 */

char  *prompt = "& ";

const struct cmd *com;  /* command we are running */

/*
 * 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.
 */
int
setfile(char *name)
{
      FILE *ibuf;
      int i, fd;
      struct stat stb;
      char isedit = *name != '%';
      char *who = name[1] ? name + 1 : myname;
      char tempname[PATHSIZE];
      static int shudclob;

      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)) < 0)
            readonly++;
      else
            (void)close(i);
      if (shudclob) {
            (void)fclose(itf);
            (void)fclose(otf);
      }
      shudclob = 1;
      edit = isedit;
      strlcpy(prevfile, mailname, PATHSIZE);
      if (name != mailname)
            strlcpy(mailname, name, sizeof(mailname));
      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, 1);
      if ((itf = fopen(tempname, "r")) == NULL)
            err(1, "%s", tempname);
      (void)fcntl(fileno(itf), F_SETFD, 1);
      (void)rm(tempname);
      setptr(ibuf, (off_t)0);
      setmsize(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 && msgCount == 0) {
nomail:
            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.
 */
int
incfile(void)
{
      int newsize;
      int omsgCount = msgCount;
      FILE *ibuf;

      ibuf = Fopen(mailname, "r");
      if (ibuf == NULL)
            return(-1);
      holdsigs();
      if (!spool_lock()) {
            (void)Fclose(ibuf);
            relsesigs();
            return(-1);
      }
      newsize = fsize(ibuf);
      /* make sure mail box has grown and is non-empty */
      if (newsize == 0 || newsize <= mailsize) {
            (void)Fclose(ibuf);
            spool_unlock();
            relsesigs();
            return(newsize == mailsize ? 0 : -1);
      }
      setptr(ibuf, mailsize);
      setmsize(msgCount);
      mailsize = ftell(ibuf);
      (void)Fclose(ibuf);
      spool_unlock();
      relsesigs();
      return(msgCount - omsgCount);
}


int   *msgvec;
int   reset_on_stop;                /* reset prompt if stopped */

/*
 * Interpret user commands one by one.  If standard input is not a tty,
 * print no prompt.
 */
void
commands(void)
{
      int n, sig, *sigp;
      int eofloop = 0;
      char linebuf[LINESIZE];

      prompt:
      for (;;) {
            /*
             * Print the prompt, if needed.  Clear out
             * string space, and flush the output.
             */
            if (!sourcing && value("interactive") != NULL) {
                  if ((value("autoinc") != NULL) && (incfile() > 0))
                        puts("New mail has arrived.");
                  reset_on_stop = 1;
                  printf("%s", prompt);
            }
            fflush(stdout);
            sreset();
            /*
             * Read a line of commands from the current input
             * and handle end of file specially.
             */
            n = 0;
            sig = 0;
            sigp = sourcing ? NULL : &sig;
            for (;;) {
                  if (readline(input, &linebuf[n], LINESIZE - n, sigp) < 0) {
                        if (sig) {
                              if (sig == SIGINT)
                                    dointr();
                              else if (sig == SIGHUP)
                                    /* nothing to do? */
                                    exit(1);
                              else {
                                    /* Stopped by job control */
                                    (void)kill(0, sig);
                                    if (reset_on_stop)
                                          reset_on_stop = 0;
                              }
                              goto prompt;
                        }
                        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") != NULL &&
                      value("ignoreeof") != NULL &&
                      ++eofloop < 25) {
                        puts("Use \"quit\" to quit.");
                        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.
 */
int
execute(char *linebuf, int contxt)
{
      char word[LINESIZE];
      char *arglist[MAXARGC];
      char *cp, *cp2;
      int c, muvec[2];
      int e = 1;

      com = NULL;

      /*
       * 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) {
                  puts("Can't \"!\" while sourcing");
                  goto out;
            }
            shell(cp+1);
            return(0);
      }
      cp2 = word;
      while (*cp && strchr(" \t0123456789$^.:/-+*'\"", *cp) == NULL)
            *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 == NULL) {
            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|STRLIST:
            /*
             * A message list defaulting to nearest forward
             * legal message.
             */
            if (msgvec == 0) {
                  puts("Illegal use of \"message list\"");
                  break;
            }
            /*
             * remove leading blanks.
             */
            while (isspace(*cp))
                  cp++;

            if (isdigit(*cp) || *cp == ':') {
                  if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0)
                        break;
                  /* position to next space - past the message list */
                  while (!isspace(*cp))
                        cp++;
                  /* position to next non-space */
                  while (isspace(*cp))
                        cp++;
            } else {
                  c = 0; /* no message list */
            }

            if (c  == 0) {
                  *msgvec = first(com->c_msgflag,
                        com->c_msgmask);
                  msgvec[1] = NULL;
            }
            if (*msgvec == 0) {
                  puts("No applicable messages");
                  break;
            }
            /*
             * Just the straight string, with
             * leading blanks removed.
             */
            while (isspace(*cp))
                  cp++;

            e = (*com->c_func2)(msgvec, cp);
            break;

      case MSGLIST:
            /*
             * A message list defaulting to nearest forward
             * legal message.
             */
            if (msgvec == NULL) {
                  puts("Illegal use of \"message list\"");
                  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 == 0) {
                  puts("No applicable messages");
                  break;
            }
            e = (*com->c_func)(msgvec);
            break;

      case NDMLIST:
            /*
             * A message list with no defaults, but no error
             * if none exist.
             */
            if (msgvec == 0) {
                  puts("Illegal use of \"message list\"");
                  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:
            errx(1, "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 (com == NULL)
            return(0);
      if (value("autoprint") != NULL && 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.
 */
void
setmsize(int n)
{
      int *msgvec2;
      size_t msize;

      msize = (n + 1) * sizeof(*msgvec);
      if ((msgvec2 = realloc(msgvec, msize)) == NULL)
            errx(1, "Out of memory");
      msgvec = msgvec2;
      memset(msgvec, 0, msize);
}

/*
 * Find the correct command in the command table corresponding
 * to the passed command "word"
 */

const struct cmd *
lex(char *word)
{
      extern const struct cmd cmdtab[];
      const struct cmd *cp;

      if (word[0] == '#')
            word = "#";
      for (cp = &cmdtab[0]; cp->c_name != NULL; cp++)
            if (isprefix(word, cp->c_name))
                  return(cp);
      return(NULL);
}

/*
 * Determine if as1 is a valid prefix of as2.
 * Return true if yep.
 */
int
isprefix(char *as1, char *as2)
{
      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 */

void
dointr(void)
{

      noreset = 0;
      if (!inithdr)
            sawcom++;
      inithdr = 0;
      while (sourcing)
            unstack();

      close_all_files();

      if (image >= 0) {
            (void)close(image);
            image = -1;
      }
      fputs("Interrupt\n", stderr);
}

/*
 * Announce the presence of the current Mail version,
 * give the message count, and print a header listing.
 */
void
announce(void)
{
      int vec[2], mdot;

      mdot = newfileinfo(0);
      vec[0] = mdot;
      vec[1] = 0;
      dot = &message[mdot - 1];
      if (msgCount > 0 && value("noheader") == NULL) {
            inithdr++;
            headers(vec);
            inithdr = 0;
      }
}

/*
 * Announce information about the file we are editing.
 * Return a likely place to set dot.
 */
int
newfileinfo(int omsgCount)
{
      struct message *mp;
      int u, n, mdot, d, s;
      char fname[PATHSIZE], zname[PATHSIZE], *ename;

      for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++)
            if (mp->m_flag & MNEW)
                  break;
      if (mp >= &message[msgCount])
            for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++)
                  if ((mp->m_flag & MREAD) == 0)
                        break;
      if (mp < &message[msgCount])
            mdot = mp - &message[0] + 1;
      else
            mdot = omsgCount + 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, sizeof(fname)) >= 0) {
            strlcat(fname, "/", sizeof(fname));
            if (strncmp(fname, mailname, strlen(fname)) == 0) {
                  (void)snprintf(zname, sizeof(zname), "+%s",
                      mailname + strlen(fname));
                  ename = zname;
            }
      }
      printf("\"%s\": ", ename);
      if (msgCount == 1)
            fputs("1 message", stdout);
      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)
            fputs(" [Read only]", stdout);
      putchar('\n');
      return(mdot);
}

/*
 * Print the current version number.
 */
/*ARGSUSED*/
int
pversion(void *v)
{
      extern const char version[];

      printf("Version %s\n", version);
      return(0);
}

/*
 * Load a file of user definitions.
 */
void
load(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);
}

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