Line data    Source code

       1             : /* Copyright 2025 G. Branden Robinson
       2             : 
       3             : This file is part of groff, the GNU roff typesetting system.
       4             : 
       5             : groff is free software; you can redistribute it and/or modify it under
       6             : the terms of the GNU General Public License as published by the Free
       7             : Software Foundation, either version 3 of the License, or
       8             : (at your option) any later version.
       9             : 
      10             : groff is distributed in the hope that it will be useful, but WITHOUT ANY
      11             : WARRANTY; without even the implied warranty of MERCHANTABILITY or
      12             : FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      13             : for more details.
      14             : 
      15             : You should have received a copy of the GNU General Public License
      16             : along with this program.  If not, see <http://www.gnu.org/licenses/>. */
      17             : 
      18             : #ifdef HAVE_CONFIG_H
      19             : #include <config.h>
      20             : #endif
      21             : 
      22             : #include <stdio.h> // snprintf()
      23             : 
      24             : #include "cset.h" // csprint()
      25             : #include "json-encode.h" // json_char
      26             : 
      27             : // Return JSON representation of character `c` without bracketing `"`s.
      28           6 : json_char json_encode_char(unsigned char c)
      29             : {
      30             :   json_char jc;
      31             :   // These printable characters require escaping.
      32           6 :   if (('"' == c) || ('\\' == c) || ('/' == c)) {
      33           0 :     jc.len = 2;
      34           0 :     jc.buf[0] = '\\';
      35           0 :     jc.buf[1] = c;
      36             :   }
      37           6 :   else if (csprint(c)) {
      38           6 :     jc.len = 1;
      39           6 :     jc.buf[0] = c;
      40             :   }
      41           0 :   else if ('\b' == c) {
      42           0 :     jc.len = 2;
      43           0 :     jc.buf[0] = '\\';
      44           0 :     jc.buf[1] = 'b';
      45             :   }
      46           0 :   else if ('\t' == c) {
      47           0 :     jc.len = 2;
      48           0 :     jc.buf[0] = '\\';
      49           0 :     jc.buf[1] = 't';
      50             :   }
      51           0 :   else if ('\n' == c) {
      52           0 :     jc.len = 2;
      53           0 :     jc.buf[0] = '\\';
      54           0 :     jc.buf[1] = 'n';
      55             :   }
      56           0 :   else if ('\f' == c) {
      57           0 :     jc.len = 2;
      58           0 :     jc.buf[0] = '\\';
      59           0 :     jc.buf[1] = 'f';
      60             :   }
      61           0 :   else if ('\r' == c) {
      62           0 :     jc.len = 2;
      63           0 :     jc.buf[0] = '\\';
      64           0 :     jc.buf[1] = 'r';
      65             :   }
      66             :   else {
      67           0 :     jc.len = 6;
      68           0 :     (void) snprintf(jc.buf, sizeof jc.buf, "\\u%04X", c);
      69             :   }
      70           6 :   return jc;
      71             : }
      72             : 
      73             : // Local Variables:
      74             : // fill-column: 72
      75             : // mode: C++
      76             : // End:
      77             : // vim: set cindent noexpandtab shiftwidth=2 textwidth=72: