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单片机源程序如下:
/******************************************************************************/
/* */
/* GETLINE.C: Line Edited Character Input */
/* */
/******************************************************************************/
#include <stdio.h>
#define CNTLQ 0x11
#define CNTLS 0x13
#define DEL 0x7F
#define BACKSPACE 0x08
#define CR 0x0D
#define LF 0x0A
/***************/
/* Line Editor */
/***************/
void getline (char idata *line, unsigned char n) {
unsigned char cnt = 0;
char c;
do {
if ((c = _getkey ()) == CR) c = LF; /* read character */
if (c == BACKSPACE || c == DEL) { /* process backspace */
if (cnt != 0) {
cnt--; /* decrement count */
line--; /* and line pointer */
putchar (0x08); /* echo backspace */
putchar (' ');
putchar (0x08);
}
}
else if (c != CNTLQ && c != CNTLS) { /* ignore Control S/Q */
putchar (*line = c); /* echo and store character */
line++; /* increment line pointer */
cnt++; /* and count */
}
} while (cnt < n - 1 && c != LF); /* check limit and line feed */
*line = 0; /* mark end of string */
}
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