gnu/dist/diffutils/src/normal.c

   1 /*      $NetBSD$        */
   2
   3 /* Normal-format output routines for GNU DIFF.
   4
   5    Copyright (C) 1988, 1989, 1993, 1995, 1998, 2001 Free Software
   6    Foundation, Inc.
   7
   8    This file is part of GNU DIFF.
   9
  10    GNU DIFF is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2, or (at your option)
  13    any later version.
  14
  15    GNU DIFF is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; see the file COPYING.
  22    If not, write to the Free Software Foundation,
  23    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  24
  25 #include "diff.h"
  26
  27 static void print_normal_hunk (struct change *);
  28
  29 /* Print the edit-script SCRIPT as a normal diff.
  30    INF points to an array of descriptions of the two files.  */
  31
  32 void
  33 print_normal_script (struct change *script)
  34 {
  35   print_script (script, find_change, print_normal_hunk);
  36 }
  37
  38 /* Print a hunk of a normal diff.
  39    This is a contiguous portion of a complete edit script,
  40    describing changes in consecutive lines.  */
  41
  42 static void
  43 print_normal_hunk (struct change *hunk)
  44 {
  45   lin first0, last0, first1, last1;
  46   register lin i;
  47
  48   /* Determine range of line numbers involved in each file.  */
  49   enum changes changes = analyze_hunk (hunk, &first0, &last0, &first1, &last1);
  50   if (!changes)
  51     return;
  52
  53   begin_output ();
  54
  55   /* Print out the line number header for this hunk */
  56   print_number_range (',', &files[0], first0, last0);
  57   fprintf (outfile, "%c", change_letter[changes]);
  58   print_number_range (',', &files[1], first1, last1);
  59   fprintf (outfile, "\n");
  60
  61   /* Print the lines that the first file has.  */
  62   if (changes & OLD)
  63     for (i = first0; i <= last0; i++)
  64       print_1_line ("<", &files[0].linbuf[i]);
  65
  66   if (changes == CHANGED)
  67     fprintf (outfile, "---\n");
  68
  69   /* Print the lines that the second file has.  */
  70   if (changes & NEW)
  71     for (i = first1; i <= last1; i++)
  72       print_1_line (">", &files[1].linbuf[i]);
  73 }