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Sourcecode: fhist version File versions

list.c

/*
 *    fhist - file history and comparison tools
 *    Copyright (C) 1991-1994, 1998-2000, 2002 Peter Miller;
 *    All rights reserved.
 *
 *    Derived from a work
 *    Copyright (C) 1990 David I. Bell.
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to  return information about edits
 */

#include <ac/libintl.h>
#include <ac/stdio.h>

#include <cmalloc.h>
#include <compare.h>
#include <error_intl.h>
#include <fcheck.h>
#include <fhist.h>
#include <fileio.h>
#include <list.h>
#include <subroutine.h>


/*
 * List information about a single edit.
 * The information is written to the usual output file.
 */

static void
listone(FILE *fp, long edit, POS *pp, FILE *of, const char *ofn)
{
      char        *cp;        /* current line */
      long        tempedit;   /* edit number */

      cp = get_a_line(fp, pp->p_pos, T_BEGINEDIT, sc.historyname);
      if (cp == NULL)
      {
            sub_context_ty    *scp;

            scp = sub_context_new();
            sub_var_set_long(scp, "Number", edit);
            fatal_intl
            (
                  scp,
                  i18n("position failed to beginning of edit $number")
            );
      }
      cp = getnumber(cp, &tempedit);
      if ((cp == NULL) || (edit != tempedit))
      {
            sub_context_ty    *scp;

            scp = sub_context_new();
            sub_var_set_long(scp, "Number", edit);
            fatal_intl
            (
                  scp,
                  i18n("bad number at beginning of edit $number")
            );
      }
      cp = get_a_line(fp, NOSEEK, T_REMARK, sc.historyname);
      if (cp == NULL)
            fatal_intl(0, i18n("cannot read identification line"));

      /*
       * If the quick flag was specified, then only list the raw
       * edit number, otherwise list the number and the names.
       */
      if (fc.quickflag)
            fprintf(of, "%ld\n", edit);
      else {
            fprintf(of, "Edit %ld:   %s", edit, cp);
            if (pp->p_names) {
                  fputs("Named: ", of);
                  fputs(pp->p_names, of);
                  fputs("\n", of);
            }
      }

      while ((cp = get_a_line(fp, NOSEEK, T_REMARK, sc.historyname)) != 0)
            writefx(of, cp, sc.linelen, ofn);
}


/*
 * List out information about the edits.
 * If no edit names are given, then all edits are displayed.
 * If one edit name is given, then just that edit is displayed.
 * If two edit names are given, then the specified range of edits is displayed.
 *
 * The history (.e) file is binary, because we need to seek in it.
 * The source (.s) file is text, because we don't need to seek in it.
 * The input files are text, by definition.
 * The output files are text, by definition.
 */

void
listhistory(char *editname1, char *editname2, char *outputname)
{
      FILE  *fp;        /* history file */
      FILE  *of;        /* output file */
      POS   *pp;        /* current edit position entry */
      POS   *postable;  /* position table */
      long  begedit;    /* beginning edit number to display */
      long  endedit;    /* ending edit number to display */
      int   step;       /* step value for loop */

      fp = openhistoryfile(OHF_READ);
      begedit = sc.lastedit;
      endedit = sc.firstedit;
      if (editname1) {
            begedit = findeditnumber(fp, editname1);
            endedit = begedit;
      }
      if (editname2)
            endedit = findeditnumber(fp, editname2);
      if (outputname)
      {
            of = fopen_and_check(outputname, "w");
      }
      else
      {
            of = stdout;
            outputname = gettext("standard output");
      }
      postable = readpostable(fp);
      if (!fc.quickflag)
            fprintf(of, "Module \"%s\":\n", sc.modulename);
      pp = postable + (sc.lastedit - begedit + 1);
      step = 1;
      if (begedit > endedit)
            step = -1;
      for (;;)
      {
            listone(fp, begedit, pp, of, outputname);
            if (begedit == endedit)
                  break;
            begedit += step;
            pp -= step;
            fputs("\n", of);
      }
      cm_free(postable);
      fclose_and_check(fp, sc.historyname);
      fflush_and_check(of, outputname);
      fclose_and_check(of, outputname);
}

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