utils.c

来自「Arm bootloader........Arm bootloader」· C语言 代码 · 共 68 行

#include "utils.h"


void memcpy(void *s1, const void *s2, int n)
{
	int i;

	for (i = 0; i < n; i++)
		((char *)(s1))[i] = ((const char *)(s2))[i];
}

void memset(void *s, const char ch, int n)
{
	int i;

	for (i = 0; i < n; i++)
		((char *)(s))[i] = ch;
}

unsigned short ntohs(unsigned short s)
{
	return (s >> 8) | (s << 8);
}

unsigned long ntohl(unsigned long l)
{
	return  ((l >> 24) & 0x000000ff) |
		((l >>  8) & 0x0000ff00) |
		((l <<  8) & 0x00ff0000) |
		((l << 24) & 0xff000000);
}

unsigned short htons(unsigned short s)
{
	return (s >> 8) | (s << 8);
}

unsigned long htonl(unsigned long l)
{
	return  ((l >> 24) & 0x000000ff) |
		((l >>  8) & 0x0000ff00) |
		((l <<  8) & 0x00ff0000) |
		((l << 24) & 0xff000000);
}

unsigned long strtoul(char *s, char **endptr, int radix)
{
	unsigned long ret;
	int i;

	ret = 0;

	while (*s != '\0') {
		if (*s >= '0' && *s <= '9')
			i = *s - '0';
		else if (*s >= 'a' && *s <= 'f')
			i = *s - 'a' + 0xa;
		else if (*s >= 'A' && *s <= 'F')
			i = *s - 'A' + 0xa;
		else
			break;
		ret = (ret << 4) + i;
		s++;
	}

	return ret;
}