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ex_write.c

/*-
 * Copyright (c) 1992, 1993, 1994
 *    The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1992, 1993, 1994, 1995, 1996
 *    Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)ex_write.c    10.30 (Berkeley) 7/12/96";
#endif /* not lint */

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/stat.h>

#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "../common/common.h"

enum which {WN, WQ, WRITE, XIT};
static int exwr __P((SCR *, EXCMD *, enum which));

/*
 * ex_wn -- :wn[!] [>>] [file]
 *    Write to a file and switch to the next one.
 *
 * PUBLIC: int ex_wn __P((SCR *, EXCMD *));
 */
int
ex_wn(sp, cmdp)
      SCR *sp;
      EXCMD *cmdp;
{
      if (exwr(sp, cmdp, WN))
            return (1);
      if (file_m3(sp, 0))
            return (1);

      /* The file name isn't a new file to edit. */
      cmdp->argc = 0;

      return (ex_next(sp, cmdp));
}

/*
 * ex_wq -- :wq[!] [>>] [file]
 *    Write to a file and quit.
 *
 * PUBLIC: int ex_wq __P((SCR *, EXCMD *));
 */
int
ex_wq(sp, cmdp)
      SCR *sp;
      EXCMD *cmdp;
{
      int force;

      if (exwr(sp, cmdp, WQ))
            return (1);
      if (file_m3(sp, 0))
            return (1);

      force = FL_ISSET(cmdp->iflags, E_C_FORCE);

      if (ex_ncheck(sp, force))
            return (1);

      F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
      return (0);
}

/*
 * ex_write --    :write[!] [>>] [file]
 *          :write [!] [cmd]
 *    Write to a file.
 *
 * PUBLIC: int ex_write __P((SCR *, EXCMD *));
 */
int
ex_write(sp, cmdp)
      SCR *sp;
      EXCMD *cmdp;
{
      return (exwr(sp, cmdp, WRITE));
}


/*
 * ex_xit -- :x[it]! [file]
 *    Write out any modifications and quit.
 *
 * PUBLIC: int ex_xit __P((SCR *, EXCMD *));
 */
int
ex_xit(sp, cmdp)
      SCR *sp;
      EXCMD *cmdp;
{
      int force;

      NEEDFILE(sp, cmdp);

      if (F_ISSET(sp->ep, F_MODIFIED) && exwr(sp, cmdp, XIT))
            return (1);
      if (file_m3(sp, 0))
            return (1);

      force = FL_ISSET(cmdp->iflags, E_C_FORCE);

      if (ex_ncheck(sp, force))
            return (1);

      F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
      return (0);
}

/*
 * exwr --
 *    The guts of the ex write commands.
 */
static int
exwr(sp, cmdp, cmd)
      SCR *sp;
      EXCMD *cmdp;
      enum which cmd;
{
      MARK rm;
      int flags;
      char *name, *p;

      NEEDFILE(sp, cmdp);

      /* All write commands can have an associated '!'. */
      LF_INIT(FS_POSSIBLE);
      if (FL_ISSET(cmdp->iflags, E_C_FORCE))
            LF_SET(FS_FORCE);

      /* Skip any leading whitespace. */
      if (cmdp->argc != 0)
            for (p = cmdp->argv[0]->bp; *p != '\0' && isblank(*p); ++p);

      /* If "write !" it's a pipe to a utility. */
      if (cmdp->argc != 0 && cmd == WRITE && *p == '!') {
            /* Secure means no shell access. */
            if (O_ISSET(sp, O_SECURE)) {
                  ex_emsg(sp, cmdp->cmd->name, EXM_SECURE_F);
                  return (1);
            }

            /* Expand the argument. */
            for (++p; *p && isblank(*p); ++p);
            if (*p == '\0') {
                  ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
                  return (1);
            }
            if (argv_exp1(sp, cmdp, p, strlen(p), 1))
                  return (1);

            /*
             * Historically, vi waited after a write filter even if there
             * wasn't any output from the command.  People complained when
             * nvi waited only if there was output, wanting the visual cue
             * that the program hadn't written anything.
             */
            F_SET(sp, SC_EX_WAIT_YES);

            /*
             * !!!
             * Ignore the return cursor position, the cursor doesn't
             * move.
             */
            if (ex_filter(sp, cmdp, &cmdp->addr1,
                &cmdp->addr2, &rm, cmdp->argv[1]->bp, FILTER_WRITE))
                  return (1);

            /* Ex terminates with a bang, even if the command fails. */
            if (!F_ISSET(sp, SC_VI) && !F_ISSET(sp, SC_EX_SILENT))
                  (void)ex_puts(sp, "!\n");

            return (0);
      }

      /* Set the FS_ALL flag if we're writing the entire file. */
      if (cmdp->addr1.lno <= 1 && !db_exist(sp, cmdp->addr2.lno + 1))
            LF_SET(FS_ALL);

      /* If "write >>" it's an append to a file. */
      if (cmdp->argc != 0 && cmd != XIT && p[0] == '>' && p[1] == '>') {
            LF_SET(FS_APPEND);

            /* Skip ">>" and whitespace. */
            for (p += 2; *p && isblank(*p); ++p);
      }

      /* If no other arguments, just write the file back. */
      if (cmdp->argc == 0 || *p == '\0')
            return (file_write(sp,
                &cmdp->addr1, &cmdp->addr2, NULL, flags));

      /* Build an argv so we get an argument count and file expansion. */
      if (argv_exp2(sp, cmdp, p, strlen(p)))
            return (1);

      /*
       *  0 args: impossible.
       *  1 args: impossible (I hope).
       *  2 args: read it.
       * >2 args: object, too many args.
       *
       * The 1 args case depends on the argv_sexp() function refusing
       * to return success without at least one non-blank character.
       */
      switch (cmdp->argc) {
      case 0:
      case 1:
            abort();
            /* NOTREACHED */
      case 2:
            name = cmdp->argv[1]->bp;

            /*
             * !!!
             * Historically, the read and write commands renamed
             * "unnamed" files, or, if the file had a name, set
             * the alternate file name.
             */
            if (F_ISSET(sp->frp, FR_TMPFILE) &&
                !F_ISSET(sp->frp, FR_EXNAMED)) {
                  if ((p = v_strdup(sp,
                      cmdp->argv[1]->bp, cmdp->argv[1]->len)) != NULL) {
                        free(sp->frp->name);
                        sp->frp->name = p;
                  }
                  /*
                   * The file has a real name, it's no longer a
                   * temporary, clear the temporary file flags.
                   *
                   * !!!
                   * If we're writing the whole file, FR_NAMECHANGE
                   * will be cleared by the write routine -- this is
                   * historic practice.
                   */
                  F_CLR(sp->frp, FR_TMPEXIT | FR_TMPFILE);
                  F_SET(sp->frp, FR_NAMECHANGE | FR_EXNAMED);

                  /* Notify the screen. */
                  (void)sp->gp->scr_rename(sp, sp->frp->name, 1);
            } else
                  set_alt_name(sp, name);
            break;
      default:
            ex_emsg(sp, p, EXM_FILECOUNT);
            return (1);
      }

      return (file_write(sp, &cmdp->addr1, &cmdp->addr2, name, flags));
}

/*
 * ex_writefp --
 *    Write a range of lines to a FILE *.
 *
 * PUBLIC: int ex_writefp __P((SCR *,
 * PUBLIC:    char *, FILE *, MARK *, MARK *, u_long *, u_long *, int));
 */
int
ex_writefp(sp, name, fp, fm, tm, nlno, nch, silent)
      SCR *sp;
      char *name;
      FILE *fp;
      MARK *fm, *tm;
      u_long *nlno, *nch;
      int silent;
{
      struct stat sb;
      GS *gp;
      u_long ccnt;                  /* XXX: can't print off_t portably. */
      recno_t fline, tline, lcnt;
      size_t len;
      int rval;
      char *msg, *p;

      gp = sp->gp;
      fline = fm->lno;
      tline = tm->lno;

      if (nlno != NULL) {
            *nch = 0;
            *nlno = 0;
      }

      /*
       * The vi filter code has multiple processes running simultaneously,
       * and one of them calls ex_writefp().  The "unsafe" function calls
       * in this code are to db_get() and msgq().  Db_get() is safe, see
       * the comment in ex_filter.c:ex_filter() for details.  We don't call
       * msgq if the multiple process bit in the EXF is set.
       *
       * !!!
       * Historic vi permitted files of 0 length to be written.  However,
       * since the way vi got around dealing with "empty" files was to
       * always have a line in the file no matter what, it wrote them as
       * files of a single, empty line.  We write empty files.
       *
       * "Alex, I'll take vi trivia for $1000."
       */
      ccnt = 0;
      lcnt = 0;
      msg = "253|Writing...";
      if (tline != 0)
            for (; fline <= tline; ++fline, ++lcnt) {
                  /* Caller has to provide any interrupt message. */
                  if ((lcnt + 1) % INTERRUPT_CHECK == 0) {
                        if (INTERRUPTED(sp))
                              break;
                        if (!silent) {
                              gp->scr_busy(sp, msg, msg == NULL ?
                                  BUSY_UPDATE : BUSY_ON);
                              msg = NULL;
                        }
                  }
                  if (db_get(sp, fline, DBG_FATAL, &p, &len))
                        goto err;
                  if (fwrite(p, 1, len, fp) != len)
                        goto err;
                  ccnt += len;
                  if (putc('\n', fp) != '\n')
                        break;
                  ++ccnt;
            }

      if (fflush(fp))
            goto err;
      /*
       * XXX
       * I don't trust NFS -- check to make sure that we're talking to
       * a regular file and sync so that NFS is forced to flush.
       */
      if (!fstat(fileno(fp), &sb) &&
          S_ISREG(sb.st_mode) && fsync(fileno(fp)))
            goto err;

      if (fclose(fp))
            goto err;

      rval = 0;
      if (0) {
err:        if (!F_ISSET(sp->ep, F_MULTILOCK))
                  msgq_str(sp, M_SYSERR, name, "%s");
            (void)fclose(fp);
            rval = 1;
      }

      if (!silent)
            gp->scr_busy(sp, NULL, BUSY_OFF);

      /* Report the possibly partial transfer. */
      if (nlno != NULL) {
            *nch = ccnt;
            *nlno = lcnt;
      }
      return (rval);
}

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