#ifndef _LINUX_STRING_H_
#define _LINUX_STRING_H_

#include <sys/types.h>	/* for size_t */

#ifndef NULL
#define NULL ((void *) 0)
#endif

extern inline size_t _dl_strlen(const char * str)
{
	register char *ptr = (char *) str;

	while (*ptr)
		ptr++;
	return (ptr - str);
}

extern inline char * _dl_strcpy(char * dst,const char *src)
{
	register char *ptr = dst;

	while (*src)
		*dst++ = *src++;
	*dst = '\0';

	return ptr;
}
 
extern inline int _dl_strcmp(const char * s1,const char * s2)
{
	unsigned register char c1, c2;

	do {
		c1 = (unsigned char) *s1++;
		c2 = (unsigned char) *s2++;
		if (c1 == '\0')
			return c1 - c2;
	}
	while (c1 == c2);

	return c1 - c2;
}

extern inline int _dl_strncmp(const char * s1,const char * s2,size_t len)
{
	unsigned register char c1 = '\0';
	unsigned register char c2 = '\0';

	while (len > 0) {
		c1 = (unsigned char) *s1++;
		c2 = (unsigned char) *s2++;
		if (c1 == '\0' || c1 != c2)
			return c1 - c2;
		len--;
	}

	return c1 - c2;
}

extern inline char * _dl_strchr(const char * str,int c)
{
	register char ch;

	do {
		if ((ch = *str) == c)
			return (char *) str;
		str++;
	}
	while (ch);

	return 0;
}

static inline char *_dl_strrchr(const char *str, int c)
{
	register char *prev = 0;
	register char *ptr = (char *) str;

	/* For null it's just like strlen */
	if (c == '\0') {
		return ptr + _dl_strlen(ptr);
	}

	/* everything else just step along the string. */
	while ((ptr = _dl_strchr(ptr, c)) != 0) {
		prev = ptr;
		ptr++;
	}
	return prev;
}

extern inline void * _dl_memcpy(void * dst, const void * src, size_t len)
{
	register char *a = dst;
	register const char *b = src;

	while (len--)
		*a++ = *b++;

	return dst;
}


extern inline int _dl_memcmp(const void * s1,const void * s2,size_t len)
{
	unsigned char *c1 = (unsigned char *)s1;
	unsigned char *c2 = (unsigned char *)s2;

	while (len--) {
		if (*c1 != *c2) 
			return *c1 - *c2;
		c1++;
		c2++;
	}
	return 0;
}

extern inline void * _dl_memset(void * str,int c,size_t len)
{
	register char *a = str;

	while (len--)
		*a++ = c;

	return str;
}

/* Early on, we can't call printf, so use this to print out
 * numbers using the SEND_STDERR() macro */
static inline char *_dl_simple_ltoa(unsigned long i)
{
	/* 21 digits plus null terminator, good for 64-bit or smaller ints */
	static char local[22];
	char *p = &local[21];
	*p-- = '\0';
	do {
		*p-- = '0' + i % 10;
		i /= 10;
	} while (i > 0);
	return p + 1;
}

static inline char *_dl_simple_ltoahex(unsigned long i)
{
	/* 21 digits plus null terminator, good for 64-bit or smaller ints */
	static char local[22];
	char *p = &local[21];
	*p-- = '\0';
	do {
		char temp = i % 0x10;
		if (temp <= 0x09)
		    *p-- = '0' + temp;
		else
		    *p-- = 'a' - 0x0a + temp;
		i /= 0x10;
	} while (i > 0);
	*p-- = 'x';
	*p-- = '0';
	return p + 1;
}

#endif