fgetln.h

   1 /*
   2  * Copyright (c) 1998 The NetBSD Foundation, Inc.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to The NetBSD Foundation
   6  * by Christos Zoulas.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  27  * POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 /* https://git.datadissipation.net */
  31 #ifndef FGETLN_H_
  32  #define FGETLN_H_      1
  33
  34  #ifdef FGETLN_INCLUDE_LIBC
  35   #include <errno.h>
  36   #include <stdio.h>
  37   #include <stdlib.h>
  38   #include <string.h>
  39   #include <unistd.h>
  40  #endif /* FGETLN_INCLUDE_LIBC */
  41
  42  #ifndef HAVE_FGETLN
  43   #define HAVE_FGETLN   1
  44   #define fgetln        i_fgetln_
  45 char *i_fgetln_(FILE *, size_t *);
  46  #endif /* !HAVE_FGETLN */
  47
  48  #ifdef FGETLN_IMPLEMENTATION
  49 char *
  50 i_fgetln_(FILE *fp, size_t *len)
  51 {
  52         static char *buf = NULL;
  53         static size_t bufsiz = 0;
  54         char *ptr;
  55
  56         if (buf == NULL) {
  57                 bufsiz = BUFSIZ;
  58                 if ((buf = malloc(bufsiz)) == NULL)
  59                         return NULL;
  60         }
  61
  62         if (fgets(buf, bufsiz, fp) == NULL)
  63                 return NULL;
  64
  65         *len = 0;
  66         while ((ptr = strchr(&buf[*len], '\n')) == NULL) {
  67                 size_t nbufsiz = bufsiz + BUFSIZ;
  68                 char *nbuf = realloc(buf, nbufsiz);
  69
  70                 if (nbuf == NULL) {
  71                         int oerrno = errno;
  72                         free(buf);
  73                         errno = oerrno;
  74                         buf = NULL;
  75                         return NULL;
  76                 } else {
  77                         buf = nbuf;
  78                 }
  79
  80                 if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL) {
  81                         buf[bufsiz] = '\0';
  82                         *len = strlen(buf);
  83                         return buf;
  84                 }
  85
  86                 *len = bufsiz;
  87                 bufsiz = nbufsiz;
  88         }
  89
  90         *len = (ptr - buf) + 1;
  91         return buf;
  92 }
  93  #endif /* FGETLN_IMPLEMENTATION */
  94 #endif /* !FGETLN_H_ */