fgetln.c (2341B)
1 /* 2 * Copyright © 2005 Hector Garcia Alvarez 3 * Copyright © 2005, 2008-2012 Guillem Jover <guillem@hadrons.org> 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 18 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 19 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <stdio.h> 29 #include <sys/types.h> 30 #include <string.h> 31 32 struct filebuf { 33 FILE *fp; 34 char *buf; 35 size_t len; 36 }; 37 38 #define FILEBUF_POOL_ITEMS 32 39 40 static struct filebuf fb_pool[FILEBUF_POOL_ITEMS]; 41 static int fb_pool_cur; 42 43 char * 44 fgetln(FILE *stream, size_t *len) 45 { 46 struct filebuf *fb; 47 ssize_t nread; 48 49 /* Try to diminish the possibility of several fgetln() calls being 50 * used on different streams, by using a pool of buffers per file. */ 51 fb = &fb_pool[fb_pool_cur]; 52 if (fb->fp != stream && fb->fp != NULL) { 53 fb_pool_cur++; 54 fb_pool_cur %= FILEBUF_POOL_ITEMS; 55 fb = &fb_pool[fb_pool_cur]; 56 } 57 fb->fp = stream; 58 59 nread = getline(&fb->buf, &fb->len, stream); 60 /* Note: the getdelim/getline API ensures nread != 0. */ 61 if (nread == -1) { 62 *len = 0; 63 return NULL; 64 } else { 65 *len = (size_t)nread; 66 return fb->buf; 67 } 68 }