/* pwd - print working directory	Author: Norbert Schlenker *//* * pwd - print working directory *   Syntax:	pwd *   Flags:	None. *   Author:	Norbert Schlenker *   Copyright:	None.  Released to the public domain. *   Reference:	IEEE P1003.2 Section 4.50 (draft 10) *   Bugs:	No internationalization support; all messages are in English. *//* Force visible Posix names */#ifndef _POSIX_SOURCE#define _POSIX_SOURCE 1#endif/* External interfaces */#include <sys/types.h>#include <limits.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <stdio.h>/* Magic numbers suggested or required by Posix specification */#define SUCCESS	0		/* exit code in case of success */#define FAILURE 1		/*                   or failure */_PROTOTYPE(int main, (void));static char dir[PATH_MAX + 1];static char *errmsg = "pwd: cannot search some directory on the path\n";int main(){  char *p;  size_t n;  p = getcwd(dir, PATH_MAX);  if (p == NULL) {	write(STDERR_FILENO, errmsg, strlen(errmsg));	exit(FAILURE);  }  n = strlen(p);  p[n] = '\n';  if (write(STDOUT_FILENO, p, n + 1) != n + 1) 	exit(FAILURE);  return(SUCCESS);}