compat/getline.c

   1 /*      $NetBSD: getline.c,v 1.1.1.6 2015/01/02 20:34:27 christos Exp $ */
   2
   3 /*      NetBSD: getline.c,v 1.2 2014/09/16 17:23:50 christos Exp        */
   4
   5 /*-
   6  * Copyright (c) 2011 The NetBSD Foundation, Inc.
   7  * All rights reserved.
   8  *
   9  * This code is derived from software contributed to The NetBSD Foundation
  10  * by Christos Zoulas.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  23  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  25  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 /* NETBSD ORIGINAL: external/bsd/file/dist/src/getline.c */
  35
  36 #include <sys/types.h>
  37
  38 #include <stdlib.h>
  39 #include <stdio.h>
  40 #include <unistd.h>
  41 #include <errno.h>
  42 #include <string.h>
  43
  44 #include "tmux.h"
  45
  46 static ssize_t
  47 getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
  48 {
  49         char *ptr, *eptr;
  50
  51
  52         if (*buf == NULL || *bufsiz == 0) {
  53                 if ((*buf = malloc(BUFSIZ)) == NULL)
  54                         return -1;
  55                 *bufsiz = BUFSIZ;
  56         }
  57
  58         for (ptr = *buf, eptr = *buf + *bufsiz;;) {
  59                 int c = fgetc(fp);
  60                 if (c == -1) {
  61                         if (feof(fp)) {
  62                                 ssize_t diff = (ssize_t)(ptr - *buf);
  63                                 if (diff != 0) {
  64                                         *ptr = '\0';
  65                                         return diff;
  66                                 }
  67                         }
  68                         return -1;
  69                 }
  70                 *ptr++ = c;
  71                 if (c == delimiter) {
  72                         *ptr = '\0';
  73                         return ptr - *buf;
  74                 }
  75                 if (ptr + 2 >= eptr) {
  76                         char *nbuf;
  77                         size_t nbufsiz = *bufsiz * 2;
  78                         ssize_t d = ptr - *buf;
  79                         if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
  80                                 return -1;
  81                         *buf = nbuf;
  82                         *bufsiz = nbufsiz;
  83                         eptr = nbuf + nbufsiz;
  84                         ptr = nbuf + d;
  85                 }
  86         }
  87 }
  88
  89 ssize_t
  90 getline(char **buf, size_t *bufsiz, FILE *fp)
  91 {
  92         return getdelim(buf, bufsiz, '\n', fp);
  93 }