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// MIT License, Copyright (c) 2021 Marvin Borner
#include <lib.h>
/**
* Common string functions
*/
u32 strlen(const char *str)
{
const char *s = str;
while (*s)
s++;
return s - str;
}
u32 strnlen(const char *str, u32 max)
{
const char *s = str;
while (max && *s) {
s++;
max--;
}
return s - str;
}
u32 strlcpy(char *dst, const char *src, u32 size)
{
const char *orig = src;
u32 left = size;
if (left)
while (--left)
if (!(*dst++ = *src++))
break;
if (!left) {
if (size)
*dst = 0;
while (*src++)
;
}
return src - orig - 1;
}
s32 strncmp(const char *s1, const char *s2, u32 n)
{
const u8 *c1 = (const u8 *)s1;
const u8 *c2 = (const u8 *)s2;
u8 ch;
int d = 0;
while (n--) {
d = (int)(ch = *c1++) - (int)*c2++;
if (d || !ch)
break;
}
return d;
}
/**
* Common memory functions
*/
void *memcpy(void *dest, const void *src, u32 n)
{
// Inspired by jgraef at osdev
u32 num_dwords = n / 4;
u32 num_bytes = n % 4;
u32 *dest32 = (u32 *)dest;
const u32 *src32 = (const u32 *)src;
u8 *dest8 = ((u8 *)dest) + num_dwords * 4;
const u8 *src8 = ((const u8 *)src) + num_dwords * 4;
__asm__ volatile("rep movsl\n"
: "=S"(src32), "=D"(dest32), "=c"(num_dwords)
: "S"(src32), "D"(dest32), "c"(num_dwords)
: "memory");
for (u32 i = 0; i < num_bytes; i++)
dest8[i] = src8[i];
return dest;
}
void *memset(void *dest, u32 val, u32 n)
{
// Inspired by jgraef at osdev
u32 uval = val;
u32 num_dwords = n / 4;
u32 num_bytes = n % 4;
u32 *dest32 = (u32 *)dest;
u8 *dest8 = ((u8 *)dest) + num_dwords * 4;
u8 val8 = (u8)val;
u32 val32 = uval | (uval << 8) | (uval << 16) | (uval << 24);
__asm__ volatile("rep stosl\n"
: "=D"(dest32), "=c"(num_dwords)
: "D"(dest32), "c"(num_dwords), "a"(val32)
: "memory");
for (u32 i = 0; i < num_bytes; i++)
dest8[i] = val8;
return dest;
}
/**
* Conversion
*/
int itoa(s32 value, char *buffer, u32 base)
{
char tmp[16];
char *tp = tmp;
int i;
unsigned v;
int sign = (base == 10 && value < 0);
if (sign)
v = -value;
else
v = (unsigned)value;
while (v || tp == tmp) {
i = v % base;
v /= base;
if (i < 10)
*tp++ = i + '0';
else
*tp++ = i + 'a' - 10;
}
int len = tp - tmp;
if (sign) {
*buffer++ = '-';
len++;
}
while (tp > tmp)
*buffer++ = *--tp;
*buffer = '\0';
return len;
}
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