contrib/diffutils/src/normal.c

   1 /* Normal-format output routines for GNU DIFF.
   2
   3    Copyright (C) 1988-1989, 1993, 1995, 1998, 2001, 2006, 2009-2013, 2015-2018
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GNU DIFF.
   7
   8    This program 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 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program 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.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "diff.h"
  22
  23 static void print_normal_hunk (struct change *);
  24
  25 /* Print the edit-script SCRIPT as a normal diff.
  26    INF points to an array of descriptions of the two files.  */
  27
  28 void
  29 print_normal_script (struct change *script)
  30 {
  31   print_script (script, find_change, print_normal_hunk);
  32 }
  33
  34 /* Print a hunk of a normal diff.
  35    This is a contiguous portion of a complete edit script,
  36    describing changes in consecutive lines.  */
  37
  38 static void
  39 print_normal_hunk (struct change *hunk)
  40 {
  41   lin first0, last0, first1, last1;
  42   register lin i;
  43
  44   /* Determine range of line numbers involved in each file.  */
  45   enum changes changes = analyze_hunk (hunk, &first0, &last0, &first1, &last1);
  46   if (!changes)
  47     return;
  48
  49   begin_output ();
  50
  51   /* Print out the line number header for this hunk */
  52   set_color_context (LINE_NUMBER_CONTEXT);
  53   print_number_range (',', &files[0], first0, last0);
  54   fputc (change_letter[changes], outfile);
  55   print_number_range (',', &files[1], first1, last1);
  56   set_color_context (RESET_CONTEXT);
  57   fputc ('\n', outfile);
  58
  59   /* Print the lines that the first file has.  */
  60   if (changes & OLD)
  61     {
  62       for (i = first0; i <= last0; i++)
  63         {
  64           set_color_context (DELETE_CONTEXT);
  65           print_1_line_nl ("<", &files[0].linbuf[i], true);
  66           set_color_context (RESET_CONTEXT);
  67           if (files[0].linbuf[i + 1][-1] == '\n')
  68             putc ('\n', outfile);
  69         }
  70     }
  71
  72   if (changes == CHANGED)
  73     fputs ("---\n", outfile);
  74
  75   /* Print the lines that the second file has.  */
  76   if (changes & NEW)
  77     {
  78       for (i = first1; i <= last1; i++)
  79         {
  80           set_color_context (ADD_CONTEXT);
  81           print_1_line_nl (">", &files[1].linbuf[i], true);
  82           set_color_context (RESET_CONTEXT);
  83           if (files[1].linbuf[i + 1][-1] == '\n')
  84             putc ('\n', outfile);
  85         }
  86     }
  87 }