?? more.c
字號:
#include <stdio.h>
#include <dos.h>
void main(void)
{
char buffer[256];
long row_count = 0;
union REGS inregs, outregs;
int ctrl_key_pressed, scancode;
while (fgets (buffer, sizeof(buffer), stdin))
{
fputs (buffer, stdout);
if ((++row_count % 24) == 0)
{
printf ("-- More --");
// get the scancode of the key pressed
inregs.h.ah = 0;
int86 (0x16, &inregs, &outregs);
scancode = outregs.h.ah;
// get keyboard state in case of Ctrl-C
ctrl_key_pressed = 0;
inregs.h.ah = 2;
int86 (0x16, &inregs, &outregs);
// Ctrl key flag is bit 2
ctrl_key_pressed = (outregs.h.al & 4);
// scancode for C is 0x2E
if ((ctrl_key_pressed) && (scancode == 0x2E))
break; // Ctrl-C pressed
printf ("\r");
}
}
}
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