Configuración de red, paquetes, programación y mucho más en FreeDOS

qemu-system-i386 -net nic,model=pcnet -net user -k es -smp $(($(nproc)+1)) -m 32M -drive file=freedos.img,media=disk,format=raw -drive file=FD12CD.iso,media=cdrom -boot order=d

fdnpkg install i16butil
fdnpkg install i16gcc
fdnpkg install i16newli
fdnpkg install i16budoc
fdnpkg install i16gcdoc

set DJGPP=c:\devel\djgpp\djgpp.env

fdnpkg search edit

#include <stdio.h>
#include <stdlib.h>

int main(void) {
	printf("Hello World!\n");
	return EXIT_SUCCESS;

}

i16gcc -o hello.exe -O2 hello.c
hello.exe

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <math.h>
#include <stdbool.h>
#include "calculator.h"
 
#define MAX_NUMBERS 30
 
int main(int argc, char **argv) {
   long double *array = (long double *)malloc(sizeof(long double)*MAX_NUMBERS);
   long double *result = array;
   long double aux;
   char *endstr = NULL;
   int operator;
   int max_numbers, count;
   bool check = false;
 
   if (!array) {
	  if (errno != 0)
		 perror("malloc");
	  else
		 fprintf(stderr, "Possibly no memory\n");
		 
	  return EXIT_FAILURE;
 
   }
 
   max_numbers = MAX_NUMBERS;
   count = 0;
   while (--argc) {
	  if (count++ >= max_numbers) {
		 max_numbers *= 2;
		 array = (long double *)realloc(array, sizeof(long double)*max_numbers);
 
		 if (!array) {
			if (errno != 0)
			   perror("realloc");
			else
			   fprintf(stderr, "Possibly no memory\n");
 
			free(array);
			return EXIT_FAILURE;
 
		 }
 
	  }
 
	  if (isdigit(**++argv)) {
		 errno = 0;
		 aux = strtold(*argv, &endstr);
 
		 if (errno != 0) {
			perror("stdtold");
			free(array);
			return EXIT_FAILURE;
			
		 }
 
		 *result++ = aux;
 
		 continue;
 
	  }
 
	  if (!check)
		 check = true;
 
	  result -= 2;
	  
	  if (isnan(*result) || isnan(*(result+1))) {
		 fprintf(stderr, "Invalid syntax!\n");
		 return EXIT_FAILURE;
 
	  }
 
	  operator = *argv[0];
	  errno = 0;
	  *result = calculate(*result, *(result+1), operator);
	  result++;
 
	  if (errno != 0) {
		 free(array);
		 return EXIT_FAILURE;
 
	  }
 
   }
 
   if (check)
	  printf("%Lg\n", *--result);
   else
	  fprintf(stderr, "Invalid syntax!\n");
 
   free(array);
 
   return EXIT_SUCCESS;
 
}

#include <stdio.h>
#include <errno.h>

long double calculate(long double n1, long double n2, int operator) {
	long double result;

	result = 0.0f;
	switch (operator) {
		case '+':
			result = n1 + n2;
			break;

		case '-':
			result = n1 - n2;
			break;

		case '*':
			result = n1 * n2;
			break;

		case '/':
			if (n2 == 0.0f) {
				errno = EINVAL;
				fputs("Zero divisor!\n", stderr);
			} else
				result = n1 / n2;
			break;

		default:
			errno = EINVAL;
			fprintf(stderr, "Invalid operator: '%c'\n", operator);

	}

	return result;

}

long double calculate(long double n1, long double n2, int operator);

i16gcc -o polish.exe -O2 polish.c calculator.c
polish.exe 2 2 +
polish.exe 4 2 *
polish.exe 2.5 2.5 +