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getline.c revision 1.1 
      1 /*	$NetBSD: getline.c,v 1.1 2011/03/20 20:48:57 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifdef HAVE_NBTOOL_CONFIG_H
     33 #include "nbtool_config.h"
     34 #endif
     35 
     36 #if !HAVE_GETLINE
     37 #include <stdlib.h>
     38 
     39 #ifndef HAVE_NBTOOL_CONFIG_H
     40 /* These headers are required, but included from nbtool_config.h */
     41 #include <stdio.h>
     42 #include <unistd.h>
     43 #include <errno.h>
     44 #include <string.h>
     45 #endif
     46 
     47 ssize_t
     48 getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
     49 {
     50 	char *ptr, *eptr;
     51 
     52 
     53 	if (*buf == NULL || *bufsiz == 0) {
     54 		*bufsiz = BUFSIZ;
     55 		if ((*buf = malloc(*bufsiz)) == NULL)
     56 			return -1;
     57 	}
     58 
     59 	for (ptr = *buf, eptr = *buf + *bufsiz;;) {
     60 		int c = fgetc(fp);
     61 		if (c == -1) {
     62 			if (feof(fp))
     63 				return ptr == *buf ? -1 : ptr - *buf;
     64 			else
     65 				return -1;
     66 		}
     67 		*ptr++ = c;
     68 		if (c == delimiter) {
     69 			*ptr = '\0';
     70 			return ptr - *buf;
     71 		}
     72 		if (ptr + 2 >= eptr) {
     73 			char *nbuf;
     74 			size_t nbufsiz = *bufsiz * 2;
     75 			ssize_t d = ptr - *buf;
     76 			if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
     77 				return -1;
     78 			*buf = nbuf;
     79 			*bufsiz = nbufsiz;
     80 			eptr = nbuf + nbufsiz;
     81 			ptr = nbuf + d;
     82 		}
     83 	}
     84 }
     85 
     86 ssize_t
     87 getline(char **buf, size_t *bufsiz, FILE *fp)
     88 {
     89 	return getdelim(buf, bufsiz, '\n', fp);
     90 }
     91 
     92 #endif
     93 
     94 #ifdef TEST
     95 int
     96 main(int argc, char *argv[])
     97 {
     98 	char *p = NULL;
     99 	ssize_t len;
    100 	size_t n = 0;
    101 
    102 	while ((len = getline(&p, &n, stdin)) != -1)
    103 		(void)printf("%zd %s", len, p);
    104 	free(p);
    105 	return 0;
    106 }
    107 #endif
    108