#include "fort_impl.h"
#include <wchar.h>



/*****************************************************************************
 *               LIBFORT helpers
 *****************************************************************************/

void *(*fort_malloc)(size_t size) = &malloc;
void (*fort_free)(void *ptr) = &free;
void *(*fort_calloc)(size_t nmemb, size_t size) = &calloc;
void *(*fort_realloc)(void *ptr, size_t size) = &realloc;


static void *custom_fort_calloc(size_t nmemb, size_t size)
{
    size_t total_size = nmemb * size;
    void *result = F_MALLOC(total_size);
    if (result != NULL)
        memset(result, 0, total_size);
    return result;
}

static void *custom_fort_realloc(void *ptr, size_t size)
{
    if (ptr == NULL)
        return F_MALLOC(size);
    if (size == 0) {
        F_FREE(ptr);
        return NULL;
    }

    void *new_chunk = F_MALLOC(size);
    if (new_chunk == NULL)
        return NULL;

    /*
     * In theory we should copy MIN(size, size allocated for ptr) bytes,
     * but this is rather dummy implementation so we don't care about it
     */
    memcpy(new_chunk, ptr, size);
    F_FREE(ptr);
    return new_chunk;
}

void set_memory_funcs(void *(*f_malloc)(size_t size), void (*f_free)(void *ptr))
{
    assert((f_malloc == NULL && f_free == NULL) /* Use std functions */
           || (f_malloc != NULL && f_free != NULL) /* Use custom functions */);
    fort_malloc = f_malloc;
    fort_free = f_free;

    if (fort_malloc == NULL) {
        fort_calloc = &calloc;
        fort_realloc = &realloc;
    } else {
        fort_calloc = &custom_fort_calloc;
        fort_realloc = &custom_fort_realloc;
    }

}


char *fort_strdup(const char *str)
{
    if (str == NULL)
        return NULL;

    size_t sz = strlen(str);
    char *str_copy = (char *)F_MALLOC((sz + 1) * sizeof(char));
    if (str_copy == NULL)
        return NULL;

    strcpy(str_copy, str);
    return str_copy;
}

wchar_t *fort_wcsdup(const wchar_t *str)
{
    if (str == NULL)
        return NULL;

    size_t sz = wcslen(str);
    wchar_t *str_copy = (wchar_t *)F_MALLOC((sz + 1) * sizeof(wchar_t));
    if (str_copy == NULL)
        return NULL;

    wcscpy(str_copy, str);
    return str_copy;
}

size_t number_of_columns_in_format_string(const char *fmt)
{
    int separator_counter = 0;
    const char *pos = fmt;
    while (1) {
        pos = strchr(pos, FORT_COL_SEPARATOR);
        if (pos == NULL)
            break;

        separator_counter++;
        ++pos;
    }
    return separator_counter + 1;
}

int snprint_n_chars(char *buf, size_t length, size_t n, char ch)
{
    if (length <= n)
        return -1;

    if (n == 0)
        return 0;

    int status = snprintf(buf, length, "%0*d", (int)n, 0);
    if (status < 0)
        return status;

    size_t i = 0;
    for (i = 0; i < n; ++i) {
        *buf = ch;
        buf++;
    }
    return n;
}


int wsnprint_n_chars(wchar_t *buf, size_t length, size_t n, wchar_t ch)
{
    if (length <= n)
        return -1;

    if (n == 0)
        return 0;

    int status = swprintf(buf, length, L"%0*d", (int)n, 0);
    if (status < 0)
        return status;

    size_t i = 0;
    for (i = 0; i < n; ++i) {
        *buf = ch;
        buf++;
    }
    return n;
}