Subversion Repositories HelenOS

Rev

Rev 4012 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  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. size_t strlen(const char *str)
  52. {
  53.     int i;
  54.    
  55.     for (i = 0; str[i]; i++)
  56.         ;
  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.     if (!*src)
  84.         return -1;
  85.     return 1;
  86. }
  87.  
  88.  
  89. /** Compare two NULL terminated strings
  90.  *
  91.  * Do a char-by-char comparison of two NULL terminated strings.
  92.  * The strings are considered equal iff they consist of the same
  93.  * characters on the minimum of their lengths and specified maximal
  94.  * length.
  95.  *
  96.  * @param src First string to compare.
  97.  * @param dst Second string to compare.
  98.  * @param len Maximal length for comparison.
  99.  *
  100.  * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
  101.  *
  102.  */
  103. int strncmp(const char *src, const char *dst, size_t len)
  104. {
  105.     unsigned int i;
  106.    
  107.     for (i = 0; (*src) && (*dst) && (i < len); src++, dst++, i++) {
  108.         if (*src < *dst)
  109.             return -1;
  110.         if (*src > *dst)
  111.             return 1;
  112.     }
  113.     if (i == len || *src == *dst)
  114.         return 0;
  115.     if (!*src)
  116.         return -1;
  117.     return 1;
  118. }
  119.  
  120.  
  121.  
  122. /** Copy NULL terminated string.
  123.  *
  124.  * Copy at most 'len' characters from string 'src' to 'dest'.
  125.  * If 'src' is shorter than 'len', '\0' is inserted behind the
  126.  * last copied character.
  127.  *
  128.  * @param src Source string.
  129.  * @param dest Destination buffer.
  130.  * @param len Size of destination buffer.
  131.  */
  132. void strncpy(char *dest, const char *src, size_t len)
  133. {
  134.     unsigned int i;
  135.  
  136.     for (i = 0; i < len; i++) {
  137.         if (!(dest[i] = src[i]))
  138.             return;
  139.     }
  140.  
  141.     dest[i - 1] = '\0';
  142. }
  143.  
  144. /** Copy string.
  145.  *
  146.  * Copy string from src address to dst address.  The copying is done
  147.  * char-by-char until the null character. The source and destination memory
  148.  * areas cannot overlap.
  149.  *
  150.  * @param src       Source string to copy from.
  151.  * @param dst       Destination string to copy to.
  152.  *
  153.  * @return      Address of the destination string.
  154.  */
  155. char *strcpy(char *dest, const char *src)
  156. {
  157.     char *orig = dest;
  158.    
  159.     while ((*dest++ = *src++) != '\0');
  160.  
  161.     return orig;
  162. }
  163.  
  164. /** @}
  165.  */
  166.