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edit.c

/*
 * Heirloom mailx - a mail user agent derived from Berkeley Mail.
 *
 * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
 */
/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. 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
#ifdef      DOSCCS
static char sccsid[] = "@(#)edit.c  2.24 (gritter) 3/4/06";
#endif
#endif /* not lint */

#include "rcv.h"
#include "extern.h"
#include <sys/stat.h>
#include <unistd.h>

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

static int edit1(int *msgvec, int type);

/*
 * 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.
 */
static int 
edit1(int *msgvec, int type)
{
      int c;
      int i;
      FILE *fp = NULL;
      struct message *mp;
      off_t size;
      char *line = NULL;
      size_t linesize;
      int   wb;

      /*
       * Deal with each message to be edited . . .
       */
      wb = value("writebackedited") != NULL;
      for (i = 0; msgvec[i] && i < msgCount; i++) {
            sighandler_type sigint;

            if (i > 0) {
                  char *p;

                  printf(catgets(catd, CATSET, 72,
                              "Edit message %d [ynq]? "), msgvec[i]);
                  fflush(stdout);
                  if (readline(stdin, &line, &linesize) < 0)
                        break;
                  for (p = line; blankchar(*p & 0377); p++);
                  if (*p == 'q')
                        break;
                  if (*p == 'n')
                        continue;
            }
            setdot(mp = &message[msgvec[i] - 1]);
            did_print_dot = 1;
            touch(mp);
            sigint = safe_signal(SIGINT, SIG_IGN);
            fp = run_editor(fp, mp->m_size, type,
                        (mb.mb_perm & MB_EDIT) == 0 || !wb,
                        NULL, mp, wb ? SEND_MBOX : SEND_TODISP_ALL,
                        sigint);
            if (fp != NULL) {
                  fseek(mb.mb_otf, 0L, SEEK_END);
                  size = ftell(mb.mb_otf);
                  mp->m_block = mailx_blockof(size);
                  mp->m_offset = mailx_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, mb.mb_otf) == EOF)
                              break;
                  }
                  if (ferror(mb.mb_otf))
                        perror("/tmp");
                  Fclose(fp);
            }
            safe_signal(SIGINT, sigint);
      }
      if (line)
            free(line);
      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 ed, 'v' for vi.
 */
FILE *
run_editor(FILE *fp, off_t size, int type, int readonly,
            struct header *hp, struct message *mp, enum sendaction action,
            sighandler_type oldint)
{
      FILE *nf = NULL;
      int t;
      time_t modtime;
      char *edit;
      struct stat statb;
      char *tempEdit;
      sigset_t    set;

      if ((nf = Ftemp(&tempEdit, "Re", "w", readonly ? 0400 : 0600, 1))
                  == NULL) {
            perror(catgets(catd, CATSET, 73, "temporary mail edit file"));
            goto out;
      }
      if (hp) {
            t = GTO|GSUBJECT|GCC|GBCC|GNL|GCOMMA;
            if (hp->h_from || hp->h_replyto || hp->h_sender ||
                        hp->h_organization)
                  t |= GIDENT;
            puthead(hp, nf, t, SEND_TODISP, CONV_NONE, NULL, NULL);
      }
      if (mp) {
            send(mp, nf, 0, NULL, action, NULL);
      } else {
            if (size >= 0)
                  while (--size >= 0 && (t = getc(fp)) != EOF)
                        putc(t, nf);
            else
                  while ((t = getc(fp)) != EOF)
                        putc(t, nf);
      }
      fflush(nf);
      if (fstat(fileno(nf), &statb) < 0)
            modtime = 0;
      else
            modtime = statb.st_mtime;
      if (ferror(nf)) {
            Fclose(nf);
            perror(tempEdit);
            unlink(tempEdit);
            Ftfree(&tempEdit);
            nf = NULL;
            goto out;
      }
      if (Fclose(nf) < 0) {
            perror(tempEdit);
            unlink(tempEdit);
            Ftfree(&tempEdit);
            nf = NULL;
            goto out;
      }
      nf = NULL;
      if ((edit = value(type == 'e' ? "EDITOR" : "VISUAL")) == NULL)
            edit = type == 'e' ? "ed" : "vi";
      sigemptyset(&set);
      if (run_command(edit, oldint != SIG_IGN ? &set : NULL, -1, -1,
                        tempEdit, NULL, NULL) < 0) {
            unlink(tempEdit);
            Ftfree(&tempEdit);
            goto out;
      }
      /*
       * If in read only mode or file unchanged, just remove the editor
       * temporary and return.
       */
      if (readonly) {
            unlink(tempEdit);
            Ftfree(&tempEdit);
            goto out;
      }
      if (stat(tempEdit, &statb) < 0) {
            perror(tempEdit);
            Ftfree(&tempEdit);
            goto out;
      }
      if (modtime == statb.st_mtime) {
            unlink(tempEdit);
            Ftfree(&tempEdit);
            goto out;
      }
      /*
       * Now switch to new file.
       */
      if ((nf = Fopen(tempEdit, "a+")) == NULL)
            perror(tempEdit);
out:
      if (tempEdit) {
            unlink(tempEdit);
            Ftfree(&tempEdit);
      }
      return nf;
}

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