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/*

 * Copyright (c) 2001-2004 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup generic

 * @{

 */

/**

 * @file

 * @brief   Miscellaneous functions.

 */

#include <func.h>

#include <print.h>

#include <cpu.h>

#include <arch/asm.h>

#include <arch.h>

#include <console/kconsole.h>

atomic_t haltstate = {0}; /**< Halt flag */

/** Halt wrapper

 *

 * Set halt flag and halt the cpu.

 *

 */

void halt()

{

#ifdef CONFIG_DEBUG

    bool rundebugger = false;

    if (!atomic_get(&haltstate)) {

        atomic_set(&haltstate, 1);

        rundebugger = true;

    }

#else

    atomic_set(&haltstate, 1);

#endif

    interrupts_disable();

#if (defined(CONFIG_DEBUG)) && (defined(CONFIG_KCONSOLE))

    if (rundebugger)

        kconsole("panic", "\nLast resort kernel console ready\n", false);

#endif

    if (CPU)

        printf("cpu%u: halted\n", CPU->id);

    else

        printf("cpu: halted\n");

    cpu_halt();

}

/** Return number of characters in a string.

 *

 * @param str NULL terminated string.

 *

 * @return Number of characters in str.

 */

size_t strlen(const char *str)

{

    int i;

    for (i = 0; str[i]; i++)

        ;

    return i;

}

/** Compare two NULL terminated strings

 *

 * Do a char-by-char comparison of two NULL terminated strings.

 * The strings are considered equal iff they consist of the same

 * characters on the minimum of their lengths.

 *

 * @param src First string to compare.

 * @param dst Second string to compare.

 *

 * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.

 *

 */

int strcmp(const char *src, const char *dst)

{

    for (; *src && *dst; src++, dst++) {

        if (*src < *dst)

            return -1;

        if (*src > *dst)

            return 1;

    }

    if (*src == *dst)

        return 0;

    if (!*src)

        return -1;

    return 1;

}

/** Compare two NULL terminated strings

 *

 * Do a char-by-char comparison of two NULL terminated strings.

 * The strings are considered equal iff they consist of the same

 * characters on the minimum of their lengths and specified maximal

 * length.

 *

 * @param src First string to compare.

 * @param dst Second string to compare.

 * @param len Maximal length for comparison.

 *

 * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.

 *

 */

int strncmp(const char *src, const char *dst, size_t len)

{

    unsigned int i;

    for (i = 0; (*src) && (*dst) && (i < len); src++, dst++, i++) {

        if (*src < *dst)

            return -1;

        if (*src > *dst)

            return 1;

    }

    if (i == len || *src == *dst)

        return 0;

    if (!*src)

        return -1;

    return 1;

}

/** Copy NULL terminated string.

 *

 * Copy at most 'len' characters from string 'src' to 'dest'.

 * If 'src' is shorter than 'len', '\0' is inserted behind the

 * last copied character.

 *

 * @param src Source string.

 * @param dest Destination buffer.

 * @param len Size of destination buffer.

 */

void strncpy(char *dest, const char *src, size_t len)

{

    unsigned int i;

    for (i = 0; i < len; i++) {

        if (!(dest[i] = src[i]))

            return;

    }

    dest[i-1] = '\0';

}

/** Convert ascii representation to unative_t

 *

 * Supports 0x for hexa & 0 for octal notation.

 * Does not check for overflows, does not support negative numbers

 *

 * @param text Textual representation of number

 * @return Converted number or 0 if no valid number ofund

 */

unative_t atoi(const char *text)

{

    int base = 10;

    unative_t result = 0;

    if (text[0] == '0' && text[1] == 'x') {

        base = 16;

        text += 2;

    } else if (text[0] == '0')

        base = 8;

    while (*text) {

        if (base != 16 && \

            ((*text >= 'A' && *text <= 'F' )

             || (*text >='a' && *text <='f')))

            break;

        if (base == 8 && *text >='8')

            break;

        if (*text >= '0' && *text <= '9') {

            result *= base;

            result += *text - '0';

        } else if (*text >= 'A' && *text <= 'F') {

            result *= base;

            result += *text - 'A' + 10;

        } else if (*text >= 'a' && *text <= 'f') {

            result *= base;

            result += *text - 'a' + 10;

        } else

            break;

        text++;

    }

    return result;

}

void order(const uint64_t val, uint64_t *rv, char *suffix)

{

    if (val > 10000000000000000000ULL) {

        *rv = val / 1000000000000000000ULL;

        *suffix = 'Z';

    } else if (val > 1000000000000000000ULL) {

        *rv = val / 1000000000000000ULL;

        *suffix = 'E';

    } else if (val > 1000000000000000ULL) {

        *rv = val / 1000000000000ULL;

        *suffix = 'T';

    } else if (val > 1000000000000ULL) {

        *rv = val / 1000000000ULL;

        *suffix = 'G';

    } else if (val > 1000000000ULL) {

        *rv = val / 1000000ULL;

        *suffix = 'M';

    } else if (val > 1000000ULL) {

        *rv = val / 1000ULL;

        *suffix = 'k';

    } else {

        *rv = val;

        *suffix = ' ';

    }

}

/** @}

 */