93 lines
1.5 KiB
C
93 lines
1.5 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "blang.h"
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/* no-op */
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void Ops_bang(struct State *s){
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return;
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}
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void Ops_percent(struct State *s){
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*(s->chart) = s->hand;
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}
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void Ops_carat(struct State *s){
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s->hand = 0;
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}
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void Ops_ampersand(struct State *s){
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s->hand = (char)s->chart;
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}
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void Ops_splat(struct State *s){
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s->chart = (char *)s->hand;
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}
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void Ops_plus(struct State *s){
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++(s->hand);
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}
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void Ops_dash(struct State *s){
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--(s->hand);
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}
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void Ops_right(struct State *s){
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putc((char)s->hand, stdout);
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}
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void Ops_left(struct State *s){
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s->hand = getc(stdin);
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}
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void Ops_semi(struct State *s){
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int c;
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while(
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(c = getc(stdin)) != EOF
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&& strchr("!\n", c) == NULL
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);
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}
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void Ops_cross(struct State *s){
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char *i;
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i = s->chart;
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s->chart = (char *)s->hand;
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s->hand = (unsigned char)i;
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}
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const struct {
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unsigned char name;
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void (*f)(struct State *);
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} OPS[] = {
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{ '%', Ops_percent },
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{ '^', Ops_carat },
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{ '&', Ops_ampersand },
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{ '*', Ops_splat },
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{ '+', Ops_plus },
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{ '-', Ops_dash },
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{ '>', Ops_right },
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{ '<', Ops_left },
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{ 'x', Ops_cross },
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/* no-ops */
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{ '!', Ops_bang },
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{ ' ', Ops_bang },
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{ '\n', Ops_bang },
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{ '\r', Ops_bang },
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{ '\t', Ops_bang },
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{ '\v', Ops_bang }
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};
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/* Slower than a switch but you don't have to update it when you add new
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* ops! */
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void (*Ops_lookup(char op))(struct State *){
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size_t i;
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for(i = 0; i < (sizeof OPS)/(sizeof *OPS); ++i)
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if(op == OPS[i].name)
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return OPS[i].f;
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return NULL;
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}
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