/*   abspath.c
 *
 *  Use the C library to find and print the absolute path corresponding
 *  to the given argument.
 * 
 *  rev 00  12/21/02  Linux version.
 * 
 *  Returns  0    if no arguments were given
 *          'n'   if 'n' args were given and argv[1] was successfully
 *                resolved to an absolute path ('n' is limited to 126).
 *          127  argv[1] is not a valid file or directory.
 */

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

int main (int argc, char *argv[])
{

   int  exitstatus;
   char *result;
   char resolved[PATH_MAX];
   
   if ((argc == 2) && (strcmp(argv[1], "-help") == 0)) {
      fprintf(stderr,"abspath: Prints the absolute pathname of its first argument, then exits\n");
      fprintf(stderr,"abspath: with exit status set to its number of arguments or to 127 on error.\n");
      exit (127);
   }
   
   if (argc < 2) {
      strcpy(resolved,"No argument was supplied.");
      exitstatus = 0;
   }
   else {
      result = realpath(argv[1], resolved);
      if (result == NULL) {
         strcpy(resolved,"Invalid argument; try \"abspath -help\".");
         exitstatus = 127;
      }
      else {
         exitstatus = argc - 1;
         if (exitstatus > 126) exitstatus = 126;
      }
   }
   printf("%s\n",resolved);
/* printf("exit status will be %d\n",exitstatus); */
   exit (exitstatus);

}  /* end of main() */