lib/colorize-posix.c

   1 /* Output colorization.
   2    Copyright 2011-2025 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, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Without this pragma, gcc 4.7.0 20120102 suggests that the
  18    init_colorize function might be candidate for attribute 'const'  */
  19 #if (__GNUC__ == 4 && 6 <= __GNUC_MINOR__) || 4 < __GNUC__
  20 # pragma GCC diagnostic ignored "-Wsuggest-attribute=const"
  21 #endif
  22
  23 #include <config.h>
  24
  25 #include "colorize.h"
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31
  32 /* Return non-zero if we should highlight matches in output to file
  33    descriptor FD.  */
  34 int
  35 should_colorize (void)
  36 {
  37   char const *t = getenv ("TERM");
  38   return t && strcmp (t, "dumb") != 0;
  39 }
  40
  41 void init_colorize (void) { }
  42
  43 /* Start a colorized text attribute on stdout using the SGR_START
  44    format; the attribute is specified by SGR_SEQ.  */
  45 void
  46 print_start_colorize (char const *sgr_start, char const *sgr_seq)
  47 {
  48   printf (sgr_start, sgr_seq);
  49 }
  50
  51 /* Restore the normal text attribute using the SGR_END string.  */
  52 void
  53 print_end_colorize (char const *sgr_end)
  54 {
  55   fputs (sgr_end, stdout);
  56 }