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3deb118d4b
sbcsdat.c, it would seem a shame not to actually use them. Ahem. Thanks to Ben, without whose checkin in this area I'd have forgotten completely :-) [originally from svn r2404]
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/*
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* sbcs.c - routines to handle single-byte character sets.
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*/
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#include "charset.h"
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#include "internal.h"
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/*
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* The charset_spec for any single-byte character set should
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* provide read_sbcs() as its read function, and its `data' field
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* should be a wchar_t string constant containing the 256 entries
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* of the translation table.
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*/
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void read_sbcs(charset_spec const *charset, long int input_chr,
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charset_state *state,
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void (*emit)(void *ctx, long int output), void *emitctx)
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{
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const struct sbcs_data *sd = charset->data;
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UNUSEDARG(state);
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emit(emitctx, sd->sbcs2ucs[input_chr]);
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}
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void write_sbcs(charset_spec const *charset, long int input_chr,
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charset_state *state,
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void (*emit)(void *ctx, long int output), void *emitctx)
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{
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const struct sbcs_data *sd = charset->data;
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int i, j, k, c;
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UNUSEDARG(state);
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/*
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* Binary-search in the ucs2sbcs table.
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*/
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i = -1;
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j = sd->nvalid;
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while (i+1 < j) {
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k = (i+j)/2;
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c = sd->ucs2sbcs[k];
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if (input_chr < sd->sbcs2ucs[c])
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j = k;
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else if (input_chr > sd->sbcs2ucs[c])
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i = k;
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else {
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emit(emitctx, c);
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return;
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}
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}
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emit(emitctx, ERROR);
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}
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