diplodocus.org Git - mdfrm/blob - fgetln.c

   1 /* fgetln.c -- Portable fgetln(3) implementation from OpenBSD.
   2  *
   3  * $Id$
   4  */
   5
   6 #include <sys/types.h>
   7
   8 #include <errno.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12
  13 /* $OpenBSD: memory.c,v 1.1 2001/05/23 12:34:47 espie Exp $ */
  14
  15 /*
  16  * Copyright (c) 1988, 1989, 1990, 1993
  17  *      The Regents of the University of California.  All rights reserved.
  18  * Copyright (c) 1989 by Berkeley Softworks
  19  * All rights reserved.
  20  *
  21  * This code is derived from software contributed to Berkeley by
  22  * Adam de Boor.
  23  *
  24  * Redistribution and use in source and binary forms, with or without
  25  * modification, are permitted provided that the following conditions
  26  * are met:
  27  * 1. Redistributions of source code must retain the above copyright
  28  *    notice, this list of conditions and the following disclaimer.
  29  * 2. Redistributions in binary form must reproduce the above copyright
  30  *    notice, this list of conditions and the following disclaimer in the
  31  *    documentation and/or other materials provided with the distribution.
  32  * 3. All advertising materials mentioning features or use of this software
  33  *    must display the following acknowledgement:
  34  *      This product includes software developed by the University of
  35  *      California, Berkeley and its contributors.
  36  * 4. Neither the name of the University nor the names of its contributors
  37  *    may be used to endorse or promote products derived from this software
  38  *    without specific prior written permission.
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  */
  52
  53 /*
  54  * enomem --
  55  *      die when out of memory.
  56  */
  57 void
  58 enomem(size)
  59         size_t size;
  60 {
  61         fprintf(stderr, "make: %s (%lu)\n", strerror(errno), (u_long)size);
  62         exit(2);
  63 }
  64
  65 /*
  66  * erealloc --
  67  *      realloc, but die on error.
  68  */
  69 static void *
  70 erealloc(ptr, size)
  71         void *ptr;
  72         size_t size;
  73 {
  74         if ((ptr = realloc(ptr, size)) == NULL)
  75                 enomem(size);
  76         return ptr;
  77 }
  78
  79 /*
  80  * emalloc --
  81  *      malloc, but die on error.
  82  */
  83 static void *
  84 emalloc(len)
  85         size_t len;
  86 {
  87         void *p;
  88
  89         if ((p = malloc(len)) == NULL)
  90                 enomem(len);
  91         return p;
  92 }
  93
  94 /*      $OpenBSD: util.c,v 1.18 2002/05/29 09:23:25 deraadt Exp $       */
  95
  96 /*
  97  * Copyright (c) 2001 Marc Espie.
  98  *
  99  * Redistribution and use in source and binary forms, with or without
 100  * modification, are permitted provided that the following conditions
 101  * are met:
 102  * 1. Redistributions of source code must retain the above copyright
 103  *    notice, this list of conditions and the following disclaimer.
 104  * 2. Redistributions in binary form must reproduce the above copyright
 105  *    notice, this list of conditions and the following disclaimer in the
 106  *    documentation and/or other materials provided with the distribution.
 107  *
 108  * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
 109  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 110  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 111  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OPENBSD
 112  * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 113  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 114  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 115  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 116  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 117  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 118  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 119  */
 120
 121 char *
 122 fgetln(stream, len)
 123 FILE *stream;
 124 size_t *len;
 125 {
 126     static char *buffer = NULL;
 127     static size_t buflen = 0;
 128
 129     if (buflen == 0) {
 130         buflen = 512;
 131         buffer = emalloc(buflen+1);
 132     }
 133     if (fgets(buffer, buflen+1, stream) == NULL)
 134         return NULL;
 135     *len = strlen(buffer);
 136     while (*len == buflen && buffer[*len-1] != '\n') {
 137         buffer = erealloc(buffer, 2*buflen + 1);
 138         if (fgets(buffer + buflen, buflen + 1, stream) == NULL)
 139             return NULL;
 140         *len += strlen(buffer + buflen);
 141         buflen *= 2;
 142     }
 143     return buffer;
 144 }