| 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 | } |