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mateusz.vi |
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/*
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* measure the time it takes to load an LNG file
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* Copyright (C) 2024 Mateusz Viste
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <dos.h>
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#include <conio.h> /* outp() */
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#include "../svarlang.h"
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static unsigned long nowtime = 0; /* current time counter */
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static void interrupt (*oldfunc)(void); /* interrupt function pointer */
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static void interrupt handle_clock(void) {
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static int callmod = 0;
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/* increment the time */
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nowtime += 858; /* one cycle is 858.21us to be exact */
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/* increment the callmod */
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callmod++;
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callmod &= 63; /* call the original clock INT every 64 calls */
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/* if this is the 64th call, then call handler */
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if (callmod == 0) {
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nowtime += 13; /* compensate for integer division inaccuracy */
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_chain_intr(oldfunc);
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} else { /* otherwise, clear the interrupt controller */
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outp(0x20, 0x20); /* end of interrupt */
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}
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}
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/* This routine will stop the timer. It has void return value so that it
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* can be an exit procedure. */
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static void timer_stop(void) {
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/* Disable interrupts */
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_disable();
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/* Reinstate the old interrupt handler */
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_dos_setvect(0x08, oldfunc);
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/* Reinstate the clock rate to standard 18.2 Hz */
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outp(0x43, 0x36); /* Set up for count to be sent */
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outp(0x40, 0x00); /* LSB = 00 \_together make 65536 (0) */
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outp(0x40, 0x00); /* MSB = 00 / */
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/* Enable interrupts */
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_enable();
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}
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/* This routine will start the fast clock rate by installing the handle_clock
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* routine as the interrupt service routine for the clock interrupt and then
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* setting the interrupt rate up to its higher speed by programming the 8253
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* timer chip. */
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static void timer_init(void) {
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/* Store the old interrupt handler */
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oldfunc = _dos_getvect(0x08);
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/* Set the nowtime to zero */
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nowtime = 0;
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/* Disable interrupts */
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_disable();
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/* Install the new interrupt handler */
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_dos_setvect(0x08, handle_clock);
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/* Increase the clock rate */
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outp(0x43, 0x36); /* Set up for count to be sent */
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outp(0x40, 0x00); /* LSB = 00 \_together make 2^10 = 1024 */
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outp(0x40, 0x04); /* MSB = 04 / */
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/* Enable interrupts */
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_enable();
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}
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int main(int argc, char **argv) {
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int r;
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if (argc != 2) {
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puts("loads lang from FDISK.LNG and measure how long it took");
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puts("usage: tim lang (example: tim PL)");
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return(1);
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}
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timer_init();
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r = svarlang_load("FDISK.LNG", argv[1]);
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timer_stop();
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if (r != 0) {
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printf("svarlang_load('FDISK.LNG', '%s') failed with err %d\n", argv[1], r);
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return(1);
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} else {
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int i, count = 0;
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printf("svarlang_load('FDISK.LNG', '%s') took %lu ms\nFirst 3 strings:\n", argv[1], nowtime / 1024);
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for (i = 0; i < 0xffff; i++) {
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const char *s = svarlang_strid(i);
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if (*s == 0) continue;
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puts(s);
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count++;
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if (count == 3) break;
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}
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}
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return(0);
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}
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