git.distorted.org.uk Git - u/mdw/putty/blob - charset/sbcs.c

   1 /*
   2  * sbcs.c - routines to handle single-byte character sets.
   3  */
   4
   5 #include "charset.h"
   6 #include "internal.h"
   7
   8 /*
   9  * The charset_spec for any single-byte character set should
  10  * provide read_sbcs() as its read function, and its `data' field
  11  * should be a wchar_t string constant containing the 256 entries
  12  * of the translation table.
  13  */
  14
  15 void read_sbcs(charset_spec const *charset, long int input_chr,
  16                charset_state *state,
  17                void (*emit)(void *ctx, long int output), void *emitctx)
  18 {
  19     wchar_t const *table = (wchar_t const *)charset->data;
  20
  21     UNUSEDARG(state);
  22
  23     emit(emitctx, table[input_chr]);
  24 }
  25
  26 void write_sbcs(charset_spec const *charset, long int input_chr,
  27                 charset_state *state,
  28                 void (*emit)(void *ctx, long int output), void *emitctx)
  29 {
  30     wchar_t const *table = (wchar_t const *)charset->data;
  31     int i;
  32
  33     UNUSEDARG(state);
  34
  35     /*
  36      * FIXME: this should work, but it's ludicrously inefficient.
  37      * We should be using the ucs2sbcs table.
  38      */
  39     for (i = 0; i < 256; i++)
  40         if (table[i] == input_chr) {
  41             emit(emitctx, i);
  42             return;
  43         }
  44     emit(emitctx, ERROR);
  45 }