Prex Home / Browse Source - Prex Version: 0.9.0

root/bsp/drv/lib/string.c

DEFINITIONS

1. atol
2. strnlen
3. strncpy
4. strncmp
5. strlcpy
6. memcpy
7. memset

   1 /*-
   2  * Copyright (c) 2005-2007, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #include <sys/types.h>
  31 #include <ddi.h>
  33 /*
  34  * Convert string to long integer
  35  * This version does not support minus value.
  36  */
  37 long
atol(const char *str)
  39 {
  40         long val = 0;
  42         while (*str == ' ')
str++;
  44         while (*str >= '0' && *str <= '9') {
val *= 10;
val += (*str - '0');
str++;
  48         }
  49         return val;
  50 }
size_t
strnlen(const char *str, size_t count)
  54 {
  55         const char *tmp;
  57         for (tmp = str; count-- && *tmp != '\0'; ++tmp);
  58         return (size_t)(tmp - str);
  59 }
  61 char *
strncpy(char *dest, const char *src, size_t count)
  63 {
  64         char *tmp = dest;
  66         while (count-- && (*dest++ = *src++) != '\0');
  67         return tmp;
  68 }
  70 int
strncmp(const char *src, const char *tgt, size_t count)
  72 {
  73         signed char res = 0;
  75         while (count) {
  76                 if ((res = *src - *tgt++) != 0 || !*src++)
  77                         break;
count--;
  79         }
  80         return res;
  81 }
  83 /* Safer version of strncpy */
size_t
strlcpy(char *dest, const char *src, size_t count)
  86 {
  87         const char *p = src;
  89         while (count-- && (*dest++ = *src++) != '\0');
  91         if (count == 0) {
  92                 *dest = '\0';
  93                 while (*src++);
  94         }
  95         return (size_t)(src - p - 1); /* count does not include NULL */
  96 }
  98 void *
memcpy(void *dest, const void *src, size_t count)
 100 {
 101         char *tmp = (char *)dest, *s = (char *)src;
ASSERT(count != 0);
 105         while (count--)
 106                 *tmp++ = *s++;
 107         return dest;
 108 }
 110 void *
memset(void *dest, int ch, size_t count)
 112 {
 113         char *p = (char *)dest;
ASSERT(count != 0);
 117         while (count--)
 118                 *p++ = (char)ch;
 119         return dest;
 120 }