Best way to get pwd from portable C code 1

[SkiLift]

Is the code below actually the best way to get the present working directory? The code must be portable to many flavors of Unix and Windows. The code works, but is very long for a simple thing.

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

#define WIN

#ifdef UNIX
#include <strings.h>
#endif

main()
{
  FILE *fp;
  char str[100], *cmd;

#ifdef UNIX
  cmd = "pwd >pwd.out";
#else
  cmd = "cd >pwd.out";
#endif

  system(cmd);
  fp = fopen("pwd.out", "r");
  fgets(str, 100, fp);
  fclose(fp);
  str[strlen(str)-1] = '\0';	// get rid of newline.
  printf("%s\n", str);
}

 

[SkiLift]

Try getcwd()