tools/compat/getline.c

   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