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/**
* @file lv_string.c
*/
/*********************
* INCLUDES
*********************/
#include "../../lv_conf_internal.h"
#if LV_USE_STDLIB_STRING == LV_STDLIB_BUILTIN
#include "../../misc/lv_assert.h"
#include "../../misc/lv_log.h"
#include "../../misc/lv_math.h"
#include "../../stdlib/lv_string.h"
#include "../../stdlib/lv_mem.h"
/*********************
* DEFINES
*********************/
#ifdef LV_ARCH_64
#define MEM_UNIT uint64_t
#define ALIGN_MASK 0x7
#else
#define MEM_UNIT uint32_t
#define ALIGN_MASK 0x3
#endif
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
#if LV_USE_LOG && LV_LOG_TRACE_MEM
#define LV_TRACE_MEM(...) LV_LOG_TRACE(__VA_ARGS__)
#else
#define LV_TRACE_MEM(...)
#endif
#define _COPY(d, s) *d = *s; d++; s++;
#define _SET(d, v) *d = v; d++;
#define _REPEAT8(expr) expr expr expr expr expr expr expr expr
/**********************
* GLOBAL FUNCTIONS
**********************/
void * LV_ATTRIBUTE_FAST_MEM lv_memcpy(void * dst, const void * src, size_t len)
{
uint8_t * d8 = dst;
const uint8_t * s8 = src;
/*Simplify for small memories*/
if(len < 16) {
while(len) {
*d8 = *s8;
d8++;
s8++;
len--;
}
return dst;
}
lv_uintptr_t d_align = (lv_uintptr_t)d8 & ALIGN_MASK;
lv_uintptr_t s_align = (lv_uintptr_t)s8 & ALIGN_MASK;
/*Byte copy for unaligned memories*/
if(s_align != d_align) {
while(len > 32) {
_REPEAT8(_COPY(d8, s8));
_REPEAT8(_COPY(d8, s8));
_REPEAT8(_COPY(d8, s8));
_REPEAT8(_COPY(d8, s8));
len -= 32;
}
while(len) {
_COPY(d8, s8)
len--;
}
return dst;
}
/*Make the memories aligned*/
if(d_align) {
d_align = ALIGN_MASK + 1 - d_align;
while(d_align && len) {
_COPY(d8, s8);
d_align--;
len--;
}
}
uint32_t * d32 = (uint32_t *)d8;
const uint32_t * s32 = (uint32_t *)s8;
while(len > 32) {
_REPEAT8(_COPY(d32, s32))
len -= 32;
}
d8 = (uint8_t *)d32;
s8 = (const uint8_t *)s32;
while(len) {
_COPY(d8, s8)
len--;
}
return dst;
}
void LV_ATTRIBUTE_FAST_MEM lv_memset(void * dst, uint8_t v, size_t len)
{
uint8_t * d8 = (uint8_t *)dst;
uintptr_t d_align = (lv_uintptr_t) d8 & ALIGN_MASK;
/*Make the address aligned*/
if(d_align) {
d_align = ALIGN_MASK + 1 - d_align;
while(d_align && len) {
_SET(d8, v);
len--;
d_align--;
}
}
uint32_t v32 = (uint32_t)v + ((uint32_t)v << 8) + ((uint32_t)v << 16) + ((uint32_t)v << 24);
uint32_t * d32 = (uint32_t *)d8;
while(len > 32) {
_REPEAT8(_SET(d32, v32));
len -= 32;
}
d8 = (uint8_t *)d32;
while(len) {
_SET(d8, v);
len--;
}
}
void * LV_ATTRIBUTE_FAST_MEM lv_memmove(void * dst, const void * src, size_t len)
{
if(dst < src || (char *)dst > ((char *)src + len)) {
return lv_memcpy(dst, src, len);
}
if(dst > src) {
char * tmp = (char *)dst + len - 1;
char * s = (char *)src + len - 1;
while(len--) {
*tmp-- = *s--;
}
}
else {
char * tmp = (char *)dst;
char * s = (char *)src;
while(len--) {
*tmp++ = *s++;
}
}
return dst;
}
/* See https://en.cppreference.com/w/c/string/byte/strlen for reference */
size_t lv_strlen(const char * str)
{
size_t i = 0;
while(str[i]) i++;
return i;
}
char * lv_strncpy(char * dst, const char * src, size_t dst_size)
{
size_t i;
for(i = 0; i < dst_size - 1 && src[i]; i++) {
dst[i] = src[i];
}
dst[i] = '\0';
return dst;
}
char * lv_strcpy(char * dst, const char * src)
{
char * tmp = dst;
while((*dst++ = *src++) != '\0');
return tmp;
}
int32_t lv_strcmp(const char * s1, const char * s2)
{
while(*s1 && (*s1 == *s2)) {
s1++;
s2++;
}
return *(const unsigned char *)s1 - *(const unsigned char *)s2;
}
char * lv_strdup(const char * src)
{
size_t len = lv_strlen(src) + 1;
char * dst = lv_malloc(len);
if(dst == NULL) return NULL;
lv_memcpy(dst, src, len); /*do memcpy is faster than strncpy when length is known*/
return dst;
}
/**********************
* STATIC FUNCTIONS
**********************/
#endif /*LV_STDLIB_BUILTIN*/
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