glob.c

Algorithms for Image Processing and Computer Vision Source Code

	      return GLOB_NOSPACE;
	    }
	}

      flags |= GLOB_MAGCHAR;

      if (pglob->gl_pathc == oldcount)
	/* No matches.  */
	if (flags & GLOB_NOCHECK)
	  {
	    const size_t len = strlen (pattern) + 1;
	    char *patcopy = (char *) malloc (len);
	    if (patcopy == NULL)
	      return GLOB_NOSPACE;
	    memcpy (patcopy, pattern, len);

	    pglob->gl_pathv
	      = (char **) realloc (pglob->gl_pathv,
				   (pglob->gl_pathc +
				    ((flags & GLOB_DOOFFS) ?
				     pglob->gl_offs : 0) +
				    1 + 1) *
				   sizeof (char *));
	    if (pglob->gl_pathv == NULL)
	      {
		free (patcopy);
		return GLOB_NOSPACE;
	      }

	    if (flags & GLOB_DOOFFS)
	      while (pglob->gl_pathc < pglob->gl_offs)
		pglob->gl_pathv[pglob->gl_pathc++] = NULL;

	    pglob->gl_pathv[pglob->gl_pathc++] = patcopy;
	    pglob->gl_pathv[pglob->gl_pathc] = NULL;
	    pglob->gl_flags = flags;
	  }
	else
	  return GLOB_NOMATCH;
    }
  else
    {
      status = glob_in_dir (filename, dirname, flags, errfunc, pglob);
      if (status != 0)
	return status;

      if (dirlen > 0)
	{
	  /* Stick the directory on the front of each name.  */
	  if (prefix_array (dirname,
			    &pglob->gl_pathv[oldcount],
			    pglob->gl_pathc - oldcount))
	    {
	      globfree (pglob);
	      return GLOB_NOSPACE;
	    }
	}
    }

  if (!(flags & GLOB_NOSORT))
    /* Sort the vector.  */
    qsort ((__ptr_t) & pglob->gl_pathv[oldcount],
	   pglob->gl_pathc - oldcount,
	   sizeof (char *), collated_compare);

  return 0;
}


/* Free storage allocated in PGLOB by a previous `glob' call.  */
void
globfree (pglob)
     register glob_t *pglob;
{
  if (pglob->gl_pathv != NULL)
    {
      register int i;
      for (i = 0; i < pglob->gl_pathc; ++i)
	if (pglob->gl_pathv[i] != NULL)
	  free ((__ptr_t) pglob->gl_pathv[i]);
      free ((__ptr_t) pglob->gl_pathv);
    }
}


/* Do a collated comparison of A and B.  */
static int
collated_compare (a, b)
     const __ptr_t a;
     const __ptr_t b;
{
  const char *const s1 = *(const char *const * const) a;
  const char *const s2 = *(const char *const * const) b;

  if (s1 == s2)
    return 0;
  if (s1 == NULL)
    return 1;
  if (s2 == NULL)
    return -1;
  return strcoll (s1, s2);
}


/* Prepend DIRNAME to each of N members of ARRAY, replacing ARRAY's
   elements in place.  Return nonzero if out of memory, zero if successful.
   A slash is inserted between DIRNAME and each elt of ARRAY,
   unless DIRNAME is just "/".  Each old element of ARRAY is freed.  */
static int
prefix_array (dirname, array, n)
     const char *dirname;
     char **array;
     const size_t n;
{
  register size_t i;
  size_t dirlen = strlen (dirname);

  if (dirlen == 1 && dirname[0] == '/')
    /* DIRNAME is just "/", so normal prepending would get us "//foo".
       We want "/foo" instead, so don't prepend any chars from DIRNAME.  */
    dirlen = 0;

  for (i = 0; i < n; ++i)
    {
      const size_t eltlen = strlen (array[i]) + 1;
      char *new = (char *) malloc (dirlen + 1 + eltlen);
      if (new == NULL)
	{
	  while (i > 0)
	    free ((__ptr_t) array[--i]);
	  return 1;
	}

      memcpy (new, dirname, dirlen);
      new[dirlen] = '/';
      memcpy (&new[dirlen + 1], array[i], eltlen);
      free ((__ptr_t) array[i]);
      array[i] = new;
    }

  return 0;
}


/* Return nonzero if PATTERN contains any metacharacters.
   Metacharacters can be quoted with backslashes if QUOTE is nonzero.  */
static int
glob_pattern_p (pattern, quote)
     const char *pattern;
     const int quote;
{
  register const char *p;
  int open = 0;

  for (p = pattern; *p != '\0'; ++p)
    switch (*p)
      {
      case '?':
      case '*':
	return 1;

      case '\\':
	if (quote)
	  ++p;
	break;

      case '[':
	open = 1;
	break;

      case ']':
	if (open)
	  return 1;
	break;
      }

  return 0;
}


/* Like `glob', but PATTERN is a final pathname component,
   and matches are searched for in DIRECTORY.
   The GLOB_NOSORT bit in FLAGS is ignored.  No sorting is ever done.
   The GLOB_APPEND flag is assumed to be set (always appends).  */
static int
glob_in_dir (pattern, directory, flags, errfunc, pglob)
     const char *pattern;
     const char *directory;
     int flags;
     int (*errfunc) __P ((const char *, int));
     glob_t *pglob;
{
  __ptr_t stream;

  struct globlink
    {
      struct globlink *next;
      char *name;
    };
  struct globlink *names = NULL;
  size_t nfound = 0;

  if (!glob_pattern_p (pattern, !(flags & GLOB_NOESCAPE)))
    {
      stream = NULL;
      flags |= GLOB_NOCHECK;
    }
  else
    {
      flags |= GLOB_MAGCHAR;

      stream = (__glob_opendir_hook ? (*__glob_opendir_hook) (directory)
		: (__ptr_t) opendir (directory));
      if (stream == NULL)
	{
	  if ((errfunc != NULL && (*errfunc) (directory, errno)) ||
	      (flags & GLOB_ERR))
	    return GLOB_ABEND;
	}
      else
	while (1)
	  {
	    const char *name;
	    size_t len;

	    if (__glob_readdir_hook)
	      {
		name = (*__glob_readdir_hook) (stream);
		if (name == NULL)
		  break;
		len = 0;
	      }
	    else
	      {
		struct dirent *d = readdir ((DIR *) stream);
		if (d == NULL)
		  break;
		if (! REAL_DIR_ENTRY (d))
		  continue;
		name = d->d_name;
#ifdef	HAVE_D_NAMLEN
		len = d->d_namlen;
#else
		len = 0;
#endif
	      }
		
	    if (fnmatch (pattern, name,
			 (!(flags & GLOB_PERIOD) ? FNM_PERIOD : 0) |
			 ((flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0)) == 0)
	      {
		struct globlink *new
		  = (struct globlink *) __alloca (sizeof (struct globlink));
		if (len == 0)
		  len = strlen (name);
		new->name
		  = (char *) malloc (len + ((flags & GLOB_MARK) ? 1 : 0) + 1);
		if (new->name == NULL)
		  goto memory_error;
		memcpy ((__ptr_t) new->name, name, len);
		if (flags & GLOB_MARK)
		  new->name[len++] = '/';
		new->name[len] = '\0';
		new->next = names;
		names = new;
		++nfound;
	      }
	  }
    }

  if (nfound == 0 && (flags & GLOB_NOCHECK))
    {
      size_t len = strlen (pattern);
      nfound = 1;
      names = (struct globlink *) __alloca (sizeof (struct globlink));
      names->next = NULL;
      names->name = (char *) malloc (len + ((flags & GLOB_MARK) ? 1 : 0) + 1);
      if (names->name == NULL)
	goto memory_error;
      memcpy (names->name, pattern, len);
      if (flags & GLOB_MARK)
	names->name[len++] = '/';
      names->name[len] = '\0';
    }

  pglob->gl_pathv
    = (char **) realloc (pglob->gl_pathv,
			 (pglob->gl_pathc +
			  ((flags & GLOB_DOOFFS) ? pglob->gl_offs : 0) +
			  nfound + 1) *
			 sizeof (char *));
  if (pglob->gl_pathv == NULL)
    goto memory_error;

  if (flags & GLOB_DOOFFS)
    while (pglob->gl_pathc < pglob->gl_offs)
      pglob->gl_pathv[pglob->gl_pathc++] = NULL;

  for (; names != NULL; names = names->next)
    pglob->gl_pathv[pglob->gl_pathc++] = names->name;
  pglob->gl_pathv[pglob->gl_pathc] = NULL;

  pglob->gl_flags = flags;

  if (stream != NULL)
    {
      int save = errno;
      if (__glob_closedir_hook)
	(*__glob_closedir_hook) (stream);
      else
	(void) closedir ((DIR *) stream);
      errno = save;
    }
  return nfound == 0 ? GLOB_NOMATCH : 0;

 memory_error:
  {
    int save = errno;
    if (__glob_closedir_hook)
      (*__glob_closedir_hook) (stream);
    else
      (void) closedir ((DIR *) stream);
    errno = save;
  }
  while (names != NULL)
    {
      if (names->name != NULL)
	free ((__ptr_t) names->name);
      names = names->next;
    }
  return GLOB_NOSPACE;
}

#endif	/* _LIBC or not __GNU_LIBRARY__.  */