unix4lyfe git - darkstat-debian/blob - bsd.c

   1 /* darkstat 3
   2  * copyright (c) 2001-2011 Emil Mikulic.
   3  *
   4  * bsd.c: *BSD compatibility.
   5  *
   6  * Permission to use, copy, modify, and distribute this file for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include "bsd.h"
  20 #include "cdefs.h"
  21 #include "config.h"
  22
  23 #include <string.h> /* for strlen */
  24
  25 /* strlcpy() and strlcat() are derived from:
  26  *
  27  * $OpenBSD: strlcpy.c,v 1.4
  28  * $FreeBSD: src/lib/libc/string/strlcpy.c,v 1.8
  29  *
  30  * $OpenBSD: strlcat.c,v 1.2
  31  * $FreeBSD: src/lib/libc/string/strlcat.c,v 1.10
  32  *
  33  * under the following license:
  34  *
  35  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
  36  * All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. The name of the author may not be used to endorse or promote products
  47  *    derived from this software without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  50  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  51  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
  52  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  53  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  54  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  55  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  56  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  57  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  58  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  59  */
  60
  61 #ifndef HAVE_STRLCPY
  62 /*
  63  * Copy src to string dst of size siz.  At most siz-1 characters
  64  * will be copied.  Always NUL terminates (unless siz == 0).
  65  * Returns strlen(src); if retval >= siz, truncation occurred.
  66  */
  67 size_t
  68 strlcpy(char * restrict dst, const char * restrict src, const size_t siz)
  69 {
  70         char *d = dst;
  71         const char *s = src;
  72         size_t n = siz;
  73
  74         /* Copy as many bytes as will fit */
  75         if (n != 0 && --n != 0) {
  76                 do {
  77                         if ((*d++ = *s++) == 0)
  78                                 break;
  79                 } while (--n != 0);
  80         }
  81
  82         /* Not enough room in dst, add NUL and traverse rest of src */
  83         if (n == 0) {
  84                 if (siz != 0)
  85                         *d = '\0';              /* NUL-terminate dst */
  86                 while (*s++)
  87                         ;
  88         }
  89
  90         return (size_t)(s - src - 1); /* count does not include NUL */
  91 }
  92 #endif
  93
  94 #ifndef HAVE_STRLCAT
  95 /*
  96  * Appends src to string dst of size siz (unlike strncat, siz is the
  97  * full size of dst, not space left).  At most siz-1 characters
  98  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
  99  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
 100  * If retval >= siz, truncation occurred.
 101  */
 102 size_t
 103 strlcat(char * restrict dst, const char * restrict src, const size_t siz)
 104 {
 105         char *d = dst;
 106         const char *s = src;
 107         size_t n = siz;
 108         size_t dlen;
 109
 110         /* Find the end of dst and adjust bytes left but don't go past end */
 111         while (n-- != 0 && *d != '\0')
 112                 d++;
 113         dlen = (size_t)(d - dst);
 114         n = siz - dlen;
 115
 116         if (n == 0)
 117                 return(dlen + strlen(s));
 118         while (*s != '\0') {
 119                 if (n != 1) {
 120                         *d++ = *s;
 121                         n--;
 122                 }
 123                 s++;
 124         }
 125         *d = '\0';
 126
 127         return (dlen + (size_t)(s - src)); /* count does not include NUL */
 128 }
 129 #endif
 130
 131 /* vim:set ts=3 sw=3 tw=78 expandtab: */