contrib/grep/lib/colorize-posix.c

   1 /* Output colorization.
   2    Copyright 2011-2015 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  17    02110-1301, USA.  */
  18
  19 /* Without this pragma, gcc 4.7.0 20120102 suggests that the
  20    init_colorize function might be candidate for attribute 'const'  */
  21 #if (__GNUC__ == 4 && 6 <= __GNUC_MINOR__) || 4 < __GNUC__
  22 # pragma GCC diagnostic ignored "-Wsuggest-attribute=const"
  23 #endif
  24
  25 #include <config.h>
  26
  27 #include "colorize.h"
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33
  34 /* Return non-zero if we should highlight matches in output to file
  35    descriptor FD.  */
  36 int
  37 should_colorize (void)
  38 {
  39   char const *t = getenv ("TERM");
  40   return t && strcmp (t, "dumb") != 0;
  41 }
  42
  43 void init_colorize (void) { }
  44
  45 /* Start a colorized text attribute on stdout using the SGR_START
  46    format; the attribute is specified by SGR_SEQ.  */
  47 void
  48 print_start_colorize (char const *sgr_start, char const *sgr_seq)
  49 {
  50   printf (sgr_start, sgr_seq);
  51 }
  52
  53 /* Restore the normal text attribute using the SGR_END string.  */
  54 void
  55 print_end_colorize (char const *sgr_end)
  56 {
  57   fputs (sgr_end, stdout);
  58 }