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91 lines
1.7 KiB
C
91 lines
1.7 KiB
C
/* ascii.c
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**
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** Shows the ASCII (or ATASCII, PETSCII) codes of typed characters.
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**
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** 2003-03-09, Greg King <gngking@erols.com>
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*/
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/* Define USE_STDIO, when you want to use the stdio functions.
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** Do not define it, when you want to use the conio functions.
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** NOTE: stdin on some targets is line-bufferred. You might need to type
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** a key, then tap the return(enter)-key, in order to see each code.
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*/
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/*
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#define USE_STDIO
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*/
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#include <conio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#define QUIT 'Q'
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/* r -- row. t -- table-column.
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*/
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static unsigned char height, width, r, t;
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static int c;
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#ifndef USE_STDIO
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# define PRINT cprintf
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# define PUT(c) cputc((char)(c))
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/* conio doesn't echo typed characters.
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** So, this function does it.
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*/
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static int GET(void) {
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PUT(c = (int)cgetc());
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return c;
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}
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#else
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# define PRINT printf
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# define GET getchar
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#endif
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int main(void) {
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# ifndef USE_STDIO
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/* conio doesn't scroll! Avoid trouble by starting at the top
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** of the screen, and never going "below" the bottom of the screen.
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*/
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clrscr();
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r = 7; /* allow for prompt */
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# endif
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/* This prompt fits on the VIC-20's narrow screen.
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*/
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PRINT("Type characters to see\r\ntheir hexadecimal code\r\nnumbers:\r\n\n");
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screensize(&width, &height); /* get the screen's dimensions */
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width /= 6; /* get number of codes on a line */
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cursor(true);
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t = 0;
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while ((c = GET()) != EOF) {
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# ifndef USE_STDIO
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if (r == height) {
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clrscr();
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t = 0;
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PUT(c); /* echo char. again because screen was erased */
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r = 1;
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}
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if (c == '\n')
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++r;
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# endif
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PRINT("=$%02x ", c);
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if (c == QUIT)
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break;
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if (++t == width) {
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PRINT("\r\n");
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++r;
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t = 0;
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}
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}
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PRINT("\r\n");
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return EXIT_SUCCESS;
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}
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