Subversion Repositories SvarDOS

/* getdelim.c --- Implementation of replacement getdelim function.

   Copyright (C) 1994, 1996, 1997, 1998, 2001, 2003, 2005 Free

   Software Foundation, Inc.

   This program is free software; you can redistribute it and/or

   modify it under the terms of the GNU General Public License as

   published by the Free Software Foundation; either version 2, or (at

   your option) any later version.

   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.  See the GNU

   General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

   02110-1301, USA.  */

/* Ported from glibc by Simon Josefsson. */

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#include "getdelim.h"

#include <limits.h>

#include <stdlib.h>

#include <errno.h>

#ifndef SIZE_MAX

# define SIZE_MAX ((size_t) -1)

#endif

#ifndef SSIZE_MAX

# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))

#endif

#if !HAVE_FLOCKFILE

# undef flockfile

# define flockfile(x) ((void) 0)

#endif

#if !HAVE_FUNLOCKFILE

# undef funlockfile

# define funlockfile(x) ((void) 0)

#endif

/* Read up to (and including) a DELIMITER from FP into *LINEPTR (and

   NUL-terminate it).  *LINEPTR is a pointer returned from malloc (or

   NULL), pointing to *N characters of space.  It is realloc'ed as

   necessary.  Returns the number of characters read (not including

   the null terminator), or -1 on error or EOF.  */

ssize_t getdelim(char **lineptr, size_t *n, int delimiter, FILE *fp) {

  ssize_t result;

  size_t cur_len = 0;

  if ((lineptr == NULL) || (n == NULL) || (fp == NULL)) {

    errno = EINVAL;

    return(-1);

  }

  flockfile (fp);

  if ((*lineptr == NULL) || (*n == 0)) {

    *n = 120;

    *lineptr = (char *)malloc(*n);

    if (*lineptr == NULL) {

      result = -1;

      goto unlock_return;

    }

  }

  for (;;) {

    int i;

    i = getc(fp);

    if (i == EOF) {

      result = -1;

      break;

    }

    /* Make enough space for len+1 (for final NUL) bytes.  */

    if (cur_len + 1 >= *n) {

      size_t needed_max = SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX;

      size_t needed = 2 * *n + 1;   /* Be generous. */

      char *new_lineptr;

      if (needed_max < needed) needed = needed_max;

      if (cur_len + 1 >= needed) {

        result = -1;

        goto unlock_return;

      }

      new_lineptr = (char *) realloc (*lineptr, needed);

      if (new_lineptr == NULL) {

        result = -1;

        goto unlock_return;

      }

      *lineptr = new_lineptr;

      *n = needed;

    }

    (*lineptr)[cur_len] = i;

    cur_len++;

    if (i == delimiter) break;

  }

  (*lineptr)[cur_len] = '\0';

  if (cur_len != 0) result = cur_len;

  /* result = cur_len ? cur_len : result; */ /* this one have been replaced by the line above for reading simplicity */

 unlock_return:

  funlockfile(fp);

  return(result);

}