util.c

// Copyright lowRISC contributors.
// Licensed under the Apache License, Version 2.0, see LICENSE for details.
// SPDX-License-Identifier: Apache-2.0

#include "util.h"
#include "htif.h"

void *memset(void *s, int c, size_t n) {
    for(size_t i = 0; i < n; ++i) {
        ((char*)s)[i] = 0;
    }
    return s;
}

void *memcpy(void *dest, const void *src, size_t n) {
    for(size_t i = 0; i < n; ++i) {
        ((char*)dest)[i] = ((char*)src)[i];
    }
    return dest;
}

int strcmp(const char *s1, const char *s2) {
    for (; *s1 && *s1 == *s2; ++s1, ++s2) {
    }
    return *(const unsigned char *)s1 - *(const unsigned char *)s2;
}

static unsigned strlen(const char* str) {
    long i = 0;
    while(str[i] != 0)
        ++i;
    return i;
}

void print(const char *s) {
    syscall(SYS_write, 0, (uintptr_t)s, (uintptr_t)strlen(s), 0, 0, 0, 0);
}

void print_hex(size_t x) {
    for(int i = 7; i >= 0; i--) {
        size_t digit = x >> (4 * i);
        char buf[2] = {0, 0};
        buf[0] = "0123456789ABCDEF"[digit & 0xF];
        print(buf);
    }
}