contrib/diffutils-2.8/src/normal.c

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