xstd.c

   1 /* $Id: xstd.c,v 1.2 2008/12/29 18:08:44 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008 Kristaps Dzonsons <kristaps@kth.se>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the
   7  * above copyright notice and this permission notice appear in all
   8  * copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
  11  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
  12  * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
  13  * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  14  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  15  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  16  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19 #include <err.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23 #include "private.h"
  24
  25 #ifdef __linux__
  26 extern  size_t           strlcat(char *, const char *, size_t);
  27 extern  size_t           strlcpy(char *, const char *, size_t);
  28 #endif
  29
  30
  31 int
  32 xstrcmp(const char *p1, const char *p2)
  33 {
  34
  35         return(0 == strcmp(p1, p2));
  36 }
  37
  38
  39 int
  40 xstrlcat(char *dst, const char *src, size_t sz)
  41 {
  42
  43         return(strlcat(dst, src, sz) < sz);
  44 }
  45
  46
  47 int
  48 xstrlcpy(char *dst, const char *src, size_t sz)
  49 {
  50
  51         return(strlcpy(dst, src, sz) < sz);
  52 }
  53
  54
  55
  56 void *
  57 xcalloc(size_t num, size_t sz)
  58 {
  59         void            *p;
  60
  61         if (NULL == (p = calloc(num, sz)))
  62                 err(EXIT_FAILURE, "calloc");
  63         return(p);
  64 }
  65
  66
  67 char *
  68 xstrdup(const char *p)
  69 {
  70         char            *pp;
  71
  72         if (NULL == (pp = strdup(p)))
  73                 err(EXIT_FAILURE, "strdup");
  74         return(pp);
  75 }
  76
  77
  78 #ifdef __linux__
  79 /*      $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $      */
  80
  81 /*
  82  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
  83  *
  84  * Permission to use, copy, modify, and distribute this software for any
  85  * purpose with or without fee is hereby granted, provided that the above
  86  * copyright notice and this permission notice appear in all copies.
  87  *
  88  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  89  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  90  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  91  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  92  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  93  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  94  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  95  */
  96
  97 #include <sys/types.h>
  98 #include <string.h>
  99
 100
 101 size_t
 102 strlcat(char *dst, const char *src, size_t siz)
 103 {
 104         char *d = dst;
 105         const char *s = src;
 106         size_t n = siz;
 107         size_t dlen;
 108
 109         /* Find the end of dst and adjust bytes left but don't go past end */
 110         while (n-- != 0 && *d != '\0')
 111                 d++;
 112         dlen = d - dst;
 113         n = siz - dlen;
 114
 115         if (n == 0)
 116                 return(dlen + strlen(s));
 117         while (*s != '\0') {
 118                 if (n != 1) {
 119                         *d++ = *s;
 120                         n--;
 121                 }
 122                 s++;
 123         }
 124         *d = '\0';
 125
 126         return(dlen + (s - src));       /* count does not include NUL */
 127 }
 128
 129
 130 size_t
 131 strlcpy(char *dst, const char *src, size_t siz)
 132 {
 133         char *d = dst;
 134         const char *s = src;
 135         size_t n = siz;
 136
 137         /* Copy as many bytes as will fit */
 138         if (n != 0) {
 139                 while (--n != 0) {
 140                         if ((*d++ = *s++) == '\0')
 141                                 break;
 142                 }
 143         }
 144
 145         /* Not enough room in dst, add NUL and traverse rest of src */
 146         if (n == 0) {
 147                 if (siz != 0)
 148                         *d = '\0';              /* NUL-terminate dst */
 149                 while (*s++)
 150                         ;
 151         }
 152
 153         return(s - src - 1);    /* count does not include NUL */
 154 }
 155 #endif