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Sourcecode: xabacus version File versions

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>

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;
}

#ifdef WINVER
#define LASTDELIM '\\'
#else
#ifdef VMS
#define LASTDELIM ']'
#else
#define LASTDELIM '/'
#endif
#endif
static char *
baseName(char *fileName)
{
      int i;

      for (i = strlen(fileName); i >= 0; i--) {
            if (fileName[i] == LASTDELIM
#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 (readable(temp))
                  return temp;
      }
      return NULL;
}

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