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edit.c

/*    $OpenBSD: edit.c,v 1.18 2008/07/16 14:49:09 martynas Exp $  */
/*    $NetBSD: edit.c,v 1.5 1996/06/08 19:48:20 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.
 */

#ifndef lint
#if 0
static const char sccsid[] = "@(#)edit.c  8.1 (Berkeley) 6/6/93";
#else
static const char rcsid[] = "$OpenBSD: edit.c,v 1.18 2008/07/16 14:49:09 martynas Exp $";
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/wait.h>

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

int editit(const char *, const char *);

/*
 * Mail -- a mail program
 *
 * Perform message editing functions.
 */

/*
 * Edit a message list.
 */
int
editor(void *v)
{
      int *msgvec = v;

      return(edit1(msgvec, 'e'));
}

/*
 * Invoke the visual editor on a message list.
 */
int
visual(void *v)
{
      int *msgvec = v;

      return(edit1(msgvec, 'v'));
}

/*
 * Edit a message by writing the message into a funnily-named file
 * (which should not exist) and forking an editor on it.
 * We get the editor from the stuff above.
 */
int
edit1(int *msgvec, int type)
{
      int c, i;
      FILE *fp;
      struct sigaction oact;
      sigset_t oset;
      struct message *mp;
      off_t size;

      /*
       * Deal with each message to be edited . . .
       */
      for (i = 0; msgvec[i] && i < msgCount; i++) {
            if (i > 0) {
                  char buf[100];
                  char *p;

                  printf("Edit message %d [ynq]? ", msgvec[i]);
                  if (fgets(buf, sizeof(buf), stdin) == NULL)
                        break;
                  for (p = buf; *p == ' ' || *p == '\t'; p++)
                        ;
                  if (*p == 'q')
                        break;
                  if (*p == 'n')
                        continue;
            }
            dot = mp = &message[msgvec[i] - 1];
            touch(mp);
            (void)ignoresig(SIGINT, &oact, &oset);
            fp = run_editor(setinput(mp), (off_t)mp->m_size, type, readonly);
            if (fp != NULL) {
                  (void)fseek(otf, 0L, SEEK_END);
                  size = ftell(otf);
                  mp->m_block = blockof(size);
                  mp->m_offset = offsetof(size);
                  mp->m_size = fsize(fp);
                  mp->m_lines = 0;
                  mp->m_flag |= MODIFY;
                  rewind(fp);
                  while ((c = getc(fp)) != EOF) {
                        if (c == '\n')
                              mp->m_lines++;
                        if (putc(c, otf) == EOF)
                              break;
                  }
                  if (ferror(otf))
                        warn("%s", tmpdir);
                  (void)Fclose(fp);
            }
            (void)sigprocmask(SIG_SETMASK, &oset, NULL);
            (void)sigaction(SIGINT, &oact, NULL);
      }
      return(0);
}

/*
 * Run an editor on the file at "fpp" of "size" bytes,
 * and return a new file pointer.
 * Signals must be handled by the caller.
 * "Type" is 'e' for _PATH_EX, 'v' for _PATH_VI.
 */
FILE *
run_editor(FILE *fp, off_t size, int type, int readonly)
{
      FILE *nf = NULL;
      int t;
      time_t modtime;
      char *edit, tempname[PATHSIZE];
      struct stat statb;

      (void)snprintf(tempname, sizeof(tempname),
          "%s/mail.ReXXXXXXXXXX", tmpdir);
      if ((t = mkstemp(tempname)) == -1 ||
          (nf = Fdopen(t, "w")) == NULL) {
            warn("%s", tempname);
            goto out;
      }
      if (readonly && fchmod(t, 0400) == -1) {
            warn("%s", tempname);
            (void)rm(tempname);
            goto out;
      }
      if (size >= 0)
            while (--size >= 0 && (t = getc(fp)) != EOF)
                  (void)putc(t, nf);
      else
            while ((t = getc(fp)) != EOF)
                  (void)putc(t, nf);
      (void)fflush(nf);
      if (fstat(fileno(nf), &statb) < 0)
            modtime = 0;
      else
            modtime = statb.st_mtime;
      if (ferror(nf)) {
            (void)Fclose(nf);
            warn("%s", tempname);
            (void)rm(tempname);
            nf = NULL;
            goto out;
      }
      if (Fclose(nf) < 0) {
            warn("%s", tempname);
            (void)rm(tempname);
            nf = NULL;
            goto out;
      }
      nf = NULL;
      if (type == 'e') {
            edit = value("EDITOR");
            if (edit == NULL || edit[0] == '\0')
                  edit = _PATH_EX;
      } else {
            edit = value("VISUAL");
            if (edit == NULL || edit[0] == '\0')
                  edit = _PATH_VI;
      }
      if (editit(edit, tempname) == -1) {
            (void)rm(tempname);
            goto out;
      }
      /*
       * If in read only mode or file unchanged, just remove the editor
       * temporary and return.
       */
      if (readonly) {
            (void)rm(tempname);
            goto out;
      }
      if (stat(tempname, &statb) < 0) {
            warn("%s", tempname);
            goto out;
      }
      if (modtime == statb.st_mtime) {
            (void)rm(tempname);
            goto out;
      }
      /*
       * Now switch to new file.
       */
      if ((nf = Fopen(tempname, "a+")) == NULL) {
            warn("%s", tempname);
            (void)rm(tempname);
            goto out;
      }
      (void)rm(tempname);
out:
      return(nf);
}

/*
 * Execute an editor on the specified pathname, which is interpreted
 * from the shell.  This means flags may be included.
 *
 * Returns -1 on error, or the exit value on success.
 */
int
editit(const char *ed, const char *pathname)
{
      char *argp[] = {"sh", "-c", NULL, NULL}, *p;
      sig_t sighup, sigint, sigquit, sigchld;
      pid_t pid;
      int saved_errno, st, ret = -1;

      if (ed == NULL)
            ed = getenv("VISUAL");
      if (ed == NULL || ed[0] == '\0')
            ed = getenv("EDITOR");
      if (ed == NULL || ed[0] == '\0')
            ed = _PATH_VI;
      if (asprintf(&p, "%s %s", ed, pathname) == -1)
            return (-1);
      argp[2] = p;

      sighup = signal(SIGHUP, SIG_IGN);
      sigint = signal(SIGINT, SIG_IGN);
      sigquit = signal(SIGQUIT, SIG_IGN);
      sigchld = signal(SIGCHLD, SIG_DFL);
      if ((pid = fork()) == -1)
            goto fail;
      if (pid == 0) {
            execv(_PATH_BSHELL, argp);
            _exit(127);
      }
      while (waitpid(pid, &st, 0) == -1)
            if (errno != EINTR)
                  goto fail;
      if (!WIFEXITED(st))
            errno = EINTR;
      else
            ret = WEXITSTATUS(st);

 fail:
      saved_errno = errno;
      (void)signal(SIGHUP, sighup);
      (void)signal(SIGINT, sigint);
      (void)signal(SIGQUIT, sigquit);
      (void)signal(SIGCHLD, sigchld);
      free(p);
      errno = saved_errno;
      return (ret);
}

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