70 lines
809 B
C
70 lines
809 B
C
#include <u.h>
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#include "dat.h"
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#include "fn.h"
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#define TABWIDTH 8
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static void conputc(int c);
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static int congetc(void);
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static int pos = 0;
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int
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getchar(void)
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{
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int c;
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c = congetc();
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if(c == '\r')
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c = '\n';
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if((c < ' ' && c != '\n') || c == '\177')
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return c;
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putchar(c);
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return c;
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}
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void
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putchar(int c)
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{
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switch(c){
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case '\177':
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conputc('\b');
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conputc(' ');
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case '\b':
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conputc('\b');
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if(pos > 0)
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--pos;
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break;
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case '\t':
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do{
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conputc(' ');
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}while(++pos % TABWIDTH);
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break;
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case '\n':
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case '\r':
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conputc(c);
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pos = 0;
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break;
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default:
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conputc(c);
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++pos;
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break;
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}
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}
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static void
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conputc(int c)
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{
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if(c){
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condev.putc(condev.dev, c);
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if(c == '\n')
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condev.putc(condev.dev, '\r');
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}
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}
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static int
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congetc(void)
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{
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return condev.getc(condev.dev);
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}
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