kc3-lang/libbsd/src/fgetln.c

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• Hash : 0982dcd9
  Author :
  Date : 2015-09-23T07:10:18
  

  Lock the file streams in fgetln() and fparseln()
  
  The fparseln() function had the NetBSD uppercase macros stubbed out,
  so replace them with the actual stdio ones. The fgetln() function was
  missing any locking at all.
  

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• src/fgetln.c

• /*
   * Copyright © 2005 Hector Garcia Alvarez
   * Copyright © 2005, 2008-2012 Guillem Jover <guillem@hadrons.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
   * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
   * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
   * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <stdio.h>
  #include <sys/cdefs.h>
  #include <sys/types.h>
  #include <string.h>
  
  #include "local-link.h"
  
  #ifdef HAVE_GETLINE
  struct filebuf {
  	FILE *fp;
  	char *buf;
  	size_t len;
  };
  
  #define FILEBUF_POOL_ITEMS 32
  
  static struct filebuf fb_pool[FILEBUF_POOL_ITEMS];
  static int fb_pool_cur;
  
  char *
  fgetln(FILE *stream, size_t *len)
  {
  	struct filebuf *fb;
  	ssize_t nread;
  
  	flockfile(stream);
  
  	/* Try to diminish the possibility of several fgetln() calls being
  	 * used on different streams, by using a pool of buffers per file. */
  	fb = &fb_pool[fb_pool_cur];
  	if (fb->fp != stream && fb->fp != NULL) {
  		fb_pool_cur++;
  		fb_pool_cur %= FILEBUF_POOL_ITEMS;
  		fb = &fb_pool[fb_pool_cur];
  	}
  	fb->fp = stream;
  
  	nread = getline(&fb->buf, &fb->len, stream);
  
  	funlockfile(stream);
  
  	/* Note: the getdelim/getline API ensures nread != 0. */
  	if (nread == -1) {
  		*len = 0;
  		return NULL;
  	} else {
  		*len = (size_t)nread;
  		return fb->buf;
  	}
  }
  libbsd_link_warning(fgetln,
                      "This functions cannot be safely ported, use getline(3) "
                      "instead, as it is supported by GNU and POSIX.1-2008.")
  #else
  #error "Function fgetln() needs to be ported."
  #endif
  

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