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file.c

/*
 * @(#)file.c
 *
 * Taken from xlock, many authors...
 *
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear in
 * supporting documentation, and that the name of the author not be
 * used in advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.
 *
 * This program is distributed in the hope that it will be "useful",
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "file.h"

char dirname[256];

static FILE *
carefulOpen(char *fileName, const char *type)
{
      FILE *fp = (FILE *) NULL;
      int s;
      struct stat fileStat;

      s = stat(fileName, &fileStat);
      if ((s >= 0 && S_ISREG(fileStat.st_mode)) || (s < 0 && type[0] == 'w')) {
            if ((fp = fopen(fileName, type)) == NULL)
                  return (FILE *) NULL;
      } else {
            return (FILE *) NULL;
      }

      return fp;
}

static int
readable(char *fileName)
{
      FILE *fp;

      if ((fp = carefulOpen(fileName, "r")) == NULL)
            return 0;
      (void) fclose(fp);
      return 1;
}

static char *
baseName(char *fileName)
{
      int i;

      for (i = strlen(fileName); i >= 0; i--) {
            if (fileName[i] == CHARDELIM
#ifdef WINVER
                  || fileName[i] == '/'
#endif
                  )
            return &fileName[i + 1];
      }
      return fileName;
}

char *
findFile(char *fileName)
{
      if (readable(fileName))
            return fileName;
      else {
            char *temp = baseName(fileName);

#if 0
            (void) printf ("found file %s|%s\n", fileName, temp);
#endif
            if (readable(temp))
                  return temp;
      }
      return NULL;
}

char *
getPWD()
{
#if 0
      int rc = GetCurrentDirectory(sizeof(dirname) - 1, dirname);

      dirname[rc] = '\0';
#else
      char *rc = getcwd(dirname, sizeof(dirname));

      if (rc == NULL)
            return NULL;
      else
#endif
      return dirname;
}


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