compat_getline.c

   1 #include "config.h"
   2
   3 #if HAVE_GETLINE
   4
   5 int dummy;
   6
   7 #else
   8
   9 /*      $Id: compat_getline.c,v 1.1 2015/11/07 20:52:52 schwarze Exp $ */
  10 /*
  11  * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
  12  *
  13  * Permission to use, copy, modify, and distribute this software for any
  14  * purpose with or without fee is hereby granted, provided that the above
  15  * copyright notice and this permission notice appear in all copies.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  18  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  20  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  21  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  22  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  23  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  24  */
  25
  26 #include <sys/types.h>
  27 #include <errno.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30
  31 ssize_t
  32 getline(char **buf, size_t *bufsz, FILE *fp)
  33 {
  34         char    *nbuf;
  35         size_t   nbufsz, pos;
  36         int      c;
  37
  38         if (buf == NULL || bufsz == NULL) {
  39                 errno = EINVAL;
  40                 return -1;
  41         }
  42
  43         if (*buf == NULL)
  44                 *bufsz = 0;
  45         else
  46                 **buf = '\0';
  47
  48         pos = 0;
  49         for (;;) {
  50                 if (pos + 1 >= *bufsz) {
  51                         nbufsz = *bufsz ? *bufsz * 2 : BUFSIZ;
  52                         if ((nbuf = realloc(*buf, nbufsz)) == NULL)
  53                                 return -1;
  54                         *buf = nbuf;
  55                         *bufsz = nbufsz;
  56                 }
  57                 if ((c = fgetc(fp)) == EOF) {
  58                         (*buf)[pos] = '\0';
  59                         return pos > 0 && feof(fp) ? (ssize_t)pos : -1;
  60                 }
  61                 (*buf)[pos++] = c;
  62                 (*buf)[pos] = '\0';
  63                 if (c == '\n')
  64                         return pos;
  65         }
  66 }
  67
  68 #endif