tools/compat/getline.c

   1 /*      $NetBSD: getline.c,v 1.2 2014/09/16 17:23:50 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                                 ssize_t diff = (ssize_t)(ptr - *buf);
  64                                 if (diff != 0) {
  65                                         *ptr = '\0';
  66                                         return diff;
  67                                 }
  68                         }
  69                         return -1;
  70                 }
  71                 *ptr++ = c;
  72                 if (c == delimiter) {
  73                         *ptr = '\0';
  74                         return ptr - *buf;
  75                 }
  76                 if (ptr + 2 >= eptr) {
  77                         char *nbuf;
  78                         size_t nbufsiz = *bufsiz * 2;
  79                         ssize_t d = ptr - *buf;
  80                         if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
  81                                 return -1;
  82                         *buf = nbuf;
  83                         *bufsiz = nbufsiz;
  84                         eptr = nbuf + nbufsiz;
  85                         ptr = nbuf + d;
  86                 }
  87         }
  88 }
  89
  90 ssize_t
  91 getline(char **buf, size_t *bufsiz, FILE *fp)
  92 {
  93         return getdelim(buf, bufsiz, '\n', fp);
  94 }
  95
  96 #endif
  97
  98 #ifdef TEST
  99 int
 100 main(int argc, char *argv[])
 101 {
 102         char *p = NULL;
 103         ssize_t len;
 104         size_t n = 0;
 105
 106         while ((len = getline(&p, &n, stdin)) != -1)
 107                 (void)printf("%zd %s", len, p);
 108         free(p);
 109         return 0;
 110 }
 111 #endif