FENIX_coreutils/pwd.c

#define _POSIX_C_SOURCE 200809L

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

int main(int argc, char * argv[]) {
  int mode = 01; /* 01: print PWD -L, 02: print physical path -P */

  if(argc > 1) {
    for(int i = 1; i < argc; i++) {
      if(argv[i][1] == 'L' && argv[i][2] == '\0') {
	mode = 01;
      }
      else if(argv[i][1] == 'P' && argv[i][2] == '\0') {
        mode = 02;
      }
      else {
	fprintf(stderr, "%s: invalid option: %s\n", argv[0], argv[i]);
	exit(1);
      }
    }
  }

  if(mode == 01) {
    printf("%s\n", getenv("PWD"));
  }
  else {
    printf("%s\n", getcwd(NULL, 0));
  }

  return 0;
}