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  1. /*
  2.  * Copyright (c) 2001-2004 Jakub Jermar
  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.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup generic
  30.  * @{
  31.  */
  32.  
  33. /**
  34.  * @file
  35.  * @brief Miscellaneous functions.
  36.  */
  37.  
  38. #include <string.h>
  39. #include <print.h>
  40. #include <cpu.h>
  41. #include <arch/asm.h>
  42. #include <arch.h>
  43. #include <console/kconsole.h>
  44.  
  45. /** Return number of characters in a string.
  46.  *
  47.  * @param str NULL terminated string.
  48.  *
  49.  * @return Number of characters in str.
  50.  *
  51.  */
  52. size_t strlen(const char *str)
  53. {
  54.     int i;
  55.    
  56.     for (i = 0; str[i]; i++);
  57.    
  58.     return i;
  59. }
  60.  
  61. /** Compare two NULL terminated strings
  62.  *
  63.  * Do a char-by-char comparison of two NULL terminated strings.
  64.  * The strings are considered equal iff they consist of the same
  65.  * characters on the minimum of their lengths.
  66.  *
  67.  * @param src First string to compare.
  68.  * @param dst Second string to compare.
  69.  *
  70.  * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
  71.  *
  72.  */
  73. int strcmp(const char *src, const char *dst)
  74. {
  75.     for (; *src && *dst; src++, dst++) {
  76.         if (*src < *dst)
  77.             return -1;
  78.         if (*src > *dst)
  79.             return 1;
  80.     }
  81.     if (*src == *dst)
  82.         return 0;
  83.    
  84.     if (!*src)
  85.         return -1;
  86.    
  87.     return 1;
  88. }
  89.  
  90.  
  91. /** Compare two NULL terminated strings
  92.  *
  93.  * Do a char-by-char comparison of two NULL terminated strings.
  94.  * The strings are considered equal iff they consist of the same
  95.  * characters on the minimum of their lengths and specified maximal
  96.  * length.
  97.  *
  98.  * @param src First string to compare.
  99.  * @param dst Second string to compare.
  100.  * @param len Maximal length for comparison.
  101.  *
  102.  * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
  103.  *
  104.  */
  105. int strncmp(const char *src, const char *dst, size_t len)
  106. {
  107.     unsigned int i;
  108.    
  109.     for (i = 0; (*src) && (*dst) && (i < len); src++, dst++, i++) {
  110.         if (*src < *dst)
  111.             return -1;
  112.        
  113.         if (*src > *dst)
  114.             return 1;
  115.     }
  116.    
  117.     if (i == len || *src == *dst)
  118.         return 0;
  119.    
  120.     if (!*src)
  121.         return -1;
  122.    
  123.     return 1;
  124. }
  125.  
  126.  
  127.  
  128. /** Copy NULL terminated string.
  129.  *
  130.  * Copy at most 'len' characters from string 'src' to 'dest'.
  131.  * If 'src' is shorter than 'len', '\0' is inserted behind the
  132.  * last copied character.
  133.  *
  134.  * @param src  Source string.
  135.  * @param dest Destination buffer.
  136.  * @param len  Size of destination buffer.
  137.  *
  138.  */
  139. void strncpy(char *dest, const char *src, size_t len)
  140. {
  141.     unsigned int i;
  142.    
  143.     for (i = 0; i < len; i++) {
  144.         if (!(dest[i] = src[i]))
  145.             return;
  146.     }
  147.    
  148.     dest[i - 1] = '\0';
  149. }
  150.  
  151. /** Find first occurence of character in string.
  152.  *
  153.  * @param s String to search.
  154.  * @param i Character to look for.
  155.  *
  156.  * @return Pointer to character in @a s or NULL if not found.
  157.  */
  158. extern char *strchr(const char *s, int i)
  159. {
  160.     while (*s != '\0') {
  161.         if (*s == i)
  162.             return (char *) s;
  163.         ++s;
  164.     }
  165.    
  166.     return NULL;
  167. }
  168.  
  169. /** @}
  170.  */
  171.