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4011 svoboda 1 
/*
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 * Copyright (c) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup generic
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 * @{
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 */
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/**
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 * @file
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 * @brief Miscellaneous functions.
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 */
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#include <string.h>
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#include <print.h>
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#include <cpu.h>
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#include <arch/asm.h>
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#include <arch.h>
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#include <console/kconsole.h>
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/** Return number of characters in a string.
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 *
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 * @param str NULL terminated string.
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 *
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 * @return Number of characters in str.
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 *
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 */
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size_t strlen(const char *str)
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{
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    int i;
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    for (i = 0; str[i]; i++);
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    return i;
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}
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/** Compare two NULL terminated strings
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 *
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 * Do a char-by-char comparison of two NULL terminated strings.
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 * The strings are considered equal iff they consist of the same
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 * characters on the minimum of their lengths.
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 *
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 * @param src First string to compare.
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 * @param dst Second string to compare.
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 *
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 * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
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 *
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 */
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int strcmp(const char *src, const char *dst)
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{
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    for (; *src && *dst; src++, dst++) {
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        if (*src < *dst)
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            return -1;
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        if (*src > *dst)
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            return 1;
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    }
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    if (*src == *dst)
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        return 0;
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    if (!*src)
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        return -1;
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    return 1;
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}
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/** Compare two NULL terminated strings
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 *
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 * Do a char-by-char comparison of two NULL terminated strings.
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 * The strings are considered equal iff they consist of the same
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 * characters on the minimum of their lengths and specified maximal
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 * length.
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 *
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 * @param src First string to compare.
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 * @param dst Second string to compare.
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 * @param len Maximal length for comparison.
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 *
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 * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
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 *
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 */
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int strncmp(const char *src, const char *dst, size_t len)
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{
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    unsigned int i;
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    for (i = 0; (*src) && (*dst) && (i < len); src++, dst++, i++) {
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        if (*src < *dst)
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            return -1;
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        if (*src > *dst)
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            return 1;
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    }
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    if (i == len || *src == *dst)
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        return 0;
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    if (!*src)
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        return -1;
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    return 1;
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}
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/** Copy NULL terminated string.
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 *
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 * Copy at most 'len' characters from string 'src' to 'dest'.
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 * If 'src' is shorter than 'len', '\0' is inserted behind the
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 * last copied character.
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 *
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 * @param src  Source string.
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 * @param dest Destination buffer.
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 * @param len  Size of destination buffer.
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 *
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 */
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void strncpy(char *dest, const char *src, size_t len)
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{
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    unsigned int i;
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    for (i = 0; i < len; i++) {
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        if (!(dest[i] = src[i]))
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            return;
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    }
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    dest[i - 1] = '\0';
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}
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/** Find first occurence of character in string.
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 *
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 * @param s String to search.
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 * @param i Character to look for.
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 *
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 * @return Pointer to character in @a s or NULL if not found.
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 */
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extern char *strchr(const char *s, int i)
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{
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    while (*s != '\0') {
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        if (*s == i)
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            return (char *) s;
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        ++s;
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    }
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    return NULL;
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}
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/** @}
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 */