#include "string.h"

#include <debug.h>

#include <global.h>

void memset(void* dst, uint8_t value, uint32_t size){

ASSERT(dst);

char* p = dst;

while(size-- > 0)*p++ = value;

}

void memcpy(void* dst, const void* src, uint32_t size){

ASSERT(dst);

ASSERT(src);

char* p_dst = dst;

char const* p_src = src;

while(size-- > 0)*p_dst++ = *p_src++;

}

int memcmp(const void* a, const void* b, uint32_t size){

ASSERT(a);ASSERT(b);

char const* pa = a;

char const* pb = b;

while(size-- > 0){

if(*pa > *pb)

return 1;

if(*pa++ < *pb++)

return -1;

}

return 0;

}

char* strcpy(char* dst, const char* src){

char* p_dst = dst;

while(*src)*p_dst++ = *src++;

return dst;

}

uint32_t strlen(const char* str){

ASSERT(str);

uint32_t count = 0;

while(*str++)++count;

return count;

}

int8_t strcmp(const char* a, const char* b){

ASSERT(a);ASSERT(b);

while(*a && *b){

if(*a > *b)return 1;

if(*a < *b)return -1;

++a;

++b;

}

if(*a)return 1;

if(*b)return -1;

return 0;

}

char* strchr(const char* str, const uint8_t ch){

ASSERT(str);

while(*str){

if(*str++ == ch)

return (char*)--str;

}

return NULL;

}

char* strrchr(const char* str, const uint8_t ch){

ASSERT(str);

const char* last_char = NULL;

while(*str){

if(*str == ch)

last_char = str;

++str;

}

return (char*)last_char;

}

char* strcat(char* dst, const char* src){

ASSERT(dst);

ASSERT(src);

char* str = dst;

while(*str++);

--str;

while((*str++ = *src++));

return dst;

}

uint32_t strchrs(const char* str, uint8_t ch){

ASSERT(str);

uint32_t ch_cnt = 0;

char const* p = str;

while(*p){

if(*p == ch)

++ch_cnt;

++p;

}

return ch_cnt;

}