contrib/libedit/src/fgetln.c

   1 /*      $NetBSD: fgetln.c,v 1.9 2008/04/29 06:53:03 martin Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1998 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_FGETLN
  37 #include "config.h"
  38 #include <stdlib.h>
  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 char *
  48 fgetln(FILE *fp, size_t *len)
  49 {
  50         static char *buf = NULL;
  51         static size_t bufsiz = 0;
  52         char *ptr;
  53
  54
  55         if (buf == NULL) {
  56                 bufsiz = BUFSIZ;
  57                 if ((buf = malloc(bufsiz)) == NULL)
  58                         return NULL;
  59         }
  60
  61         if (fgets(buf, bufsiz, fp) == NULL)
  62                 return NULL;
  63
  64         *len = 0;
  65         while ((ptr = strchr(&buf[*len], '\n')) == NULL) {
  66                 size_t nbufsiz = bufsiz + BUFSIZ;
  67                 char *nbuf = realloc(buf, nbufsiz);
  68
  69                 if (nbuf == NULL) {
  70                         int oerrno = errno;
  71                         free(buf);
  72                         errno = oerrno;
  73                         buf = NULL;
  74                         return NULL;
  75                 } else
  76                         buf = nbuf;
  77
  78                 if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL) {
  79                         buf[bufsiz] = '\0';
  80                         *len = strlen(buf);
  81                         return buf;
  82                 }
  83
  84                 *len = bufsiz;
  85                 bufsiz = nbufsiz;
  86         }
  87
  88         *len = (ptr - buf) + 1;
  89         return buf;
  90 }
  91
  92 #endif
  93
  94 #ifdef TEST
  95 int
  96 main(int argc, char *argv[])
  97 {
  98         char *p;
  99         size_t len;
 100
 101         while ((p = fgetln(stdin, &len)) != NULL) {
 102                 (void)printf("%zu %s", len, p);
 103                 free(p);
 104         }
 105         return 0;
 106 }
 107 #endif