kc3-lang/libbsd/src/fgetwln.c

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• Hash : be327c6e
  Author :
  Date : 2022-08-24T01:58:58
  

  fgetwln: Add comment about lack of getwline(3) for recommendation
  
  Ideally we'd recommend getwline(3), but unfortunately even though it
  was part of the ISO/IEC TR 24731-2:2010 draft, it did not make it into
  C11 and is not widely implemented.
  

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• src/fgetwln.c

• /*
   * Copyright © 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 <sys/cdefs.h>
  
  #include <stdlib.h>
  #include <stdio.h>
  #include <wchar.h>
  
  #include "local-link.h"
  
  struct filewbuf {
  	FILE *fp;
  	wchar_t *wbuf;
  	size_t len;
  };
  
  #define FILEWBUF_INIT_LEN	128
  #define FILEWBUF_POOL_ITEMS	32
  
  static struct filewbuf fb_pool[FILEWBUF_POOL_ITEMS];
  static int fb_pool_cur;
  
  wchar_t *
  fgetwln(FILE *stream, size_t *lenp)
  {
  	struct filewbuf *fb;
  	wint_t wc;
  	size_t wused = 0;
  
  	/* Try to diminish the possibility of several fgetwln() 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 %= FILEWBUF_POOL_ITEMS;
  		fb = &fb_pool[fb_pool_cur];
  	}
  	fb->fp = stream;
  
  	while ((wc = fgetwc(stream)) != WEOF) {
  		if (!fb->len || wused >= fb->len) {
  			wchar_t *wp;
  
  			if (fb->len)
  				fb->len *= 2;
  			else
  				fb->len = FILEWBUF_INIT_LEN;
  
  			wp = reallocarray(fb->wbuf, fb->len, sizeof(wchar_t));
  			if (wp == NULL) {
  				wused = 0;
  				break;
  			}
  			fb->wbuf = wp;
  		}
  
  		fb->wbuf[wused++] = wc;
  
  		if (wc == L'\n')
  			break;
  	}
  
  	*lenp = wused;
  	return wused ? fb->wbuf : NULL;
  }
  /* XXX: Ideally we'd recommend getwline(3), but unfortunately even though it
   * was part of the ISO/IEC TR 24731-2:2010 draft, it did not make it into C11
   * and is not widely implemented. */
  libbsd_link_warning(fgetwln,
                      "The fgetwln() function cannot be safely ported, use fgetwc(3) "
                      "instead, as it is supported by C99 and POSIX.1-2001.");
  

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