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#include <string.h>
#include <stdlib.h>
int strlen(const char *str) {
int i = 0;
while (str[i++]);
return i-1;
}
char *strchr(const char *str, int c) {
while (*str) {
if (*str == c) return (char*)str;
str++;
}
return NULL;
}
char *strcpy(char *dest, const char *src) {
memcpy(dest, src, strlen(src) + 1);
return (char*)src;
}
char *strdup(const char *src) {
char* ret = (char*)malloc(strlen(src) + 1);
if (ret == NULL) return ret;
strcpy(ret, src);
return ret;
}
char *strcat(char *dest, const char *src) {
char *dest2 = dest;
dest2 += strlen(dest) - 1;
while (*src) {
*dest2 = *src;
src++;
dest2++;
}
*dest2 = 0;
return dest;
}
int strcmp(const char *s1, const char *s2) {
while ((*s1) && (*s1 == *s2)) {
s1++;
s2++;
}
return (* (unsigned char*)s1 - *(unsigned char*)s2);
}
void *memcpy(void *vd, const void *vs, int count) {
uint8_t *dest = (uint8_t*)vd, *src = (uint8_t*)vs;
int f = count % 4, n = count / 4, i;
const uint32_t* s = (uint32_t*)src;
uint32_t* d = (uint32_t*)dest;
for (i = 0; i < n; i++) {
d[i] = s[i];
}
if (f != 0) {
for (i = count - f; i < count; i++) {
dest[i] = src[i];
}
}
return vd;
}
void *memset(void *dest, int val, int count) {
uint8_t *dest_c = (uint8_t*)dest;
int i;
for (i = 0; i < count; i++) {
dest_c[i] = val;
}
return dest;
}
uint16_t *memsetw(uint16_t *dest, uint16_t val, int count) {
int i;
for (i = 0; i < count; i++) {
dest[i] = val;
}
return dest;
}
// Formatting
char* format_int(char* buf, int number) {
if (number == 0) {
*(buf++) = '0';
return buf;
}
if (number < 0) {
*(buf++) = '-';
number = 0 - number;
}
int order = 0, temp = number, i;
char numbers[] = "0123456789";
while (temp > 0) {
order++;
temp /= 10;
}
for (i = order; i > 0; i--) {
buf[i - 1] = numbers[number % 10];
number /= 10;
}
return buf + order;
}
char* format_hex(char *buf, unsigned v) {
*(buf++) = '0';
*(buf++) = 'x';
int i;
char hexdigits[] = "0123456789ABCDEF";
for (i = 0; i < 8; i++) {
*(buf++) = hexdigits[v >> 28];
v = v << 4;
}
return buf;
}
int printf_str_len(const char *format, va_list ap) {
int l = 0;
while (*format) {
if (*format == '%') {
format++;
if (*format == 'd' || *format == 'i') {
l += 15;
va_arg(ap, int);
} else if (*format == 'p') {
l += 11;
va_arg(ap, void*);
} else if (*format == 's') {
l += strlen(va_arg(ap, const char*));
}
} else {
l++;
}
format++;
}
return l;
}
int sprintf(char *buf, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
int ret = vsprintf(buf, fmt, ap);
va_end(ap);
return ret;
}
int vsprintf(char *buf, const char *format, va_list ap) {
char *end = buf;
while (*format) {
if (*format == '%') {
format++;
if (*format == 'd' || *format == 'i') {
end = format_int(end, va_arg(ap, int));
} else if (*format == 'p') {
end = format_hex(end, va_arg(ap, uint32_t));
} else if (*format == 's') {
const char *s = va_arg(ap, const char*);
strcpy(end, s);
end += strlen(s);
}
format++;
} else {
*(end++) = *(format++);
}
}
*end = 0;
return end - buf;
}
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