common.c

关于s3c2440之bootloader的源代码

#include "common.h"
#include <stdarg.h>
#include <ctype.h>

// * char * ___strtok; */

#ifndef __HAVE_ARCH_STRCPY
/**
 * strcpy - Copy a %NUL terminated string
 * @dest: Where to copy the string to
 * @src: Where to copy the string from
 */
char * strcpy(char * dest,const char *src)
{
	char *tmp = dest;

	while ((*dest++ = *src++) != '\0')
		/* nothing */;
	return tmp;
}
#endif

#ifndef __HAVE_ARCH_STRCMP
/**
 * strcmp - Compare two strings
 * @cs: One string
 * @ct: Another string
 */
int strcmp(const char * cs,const char * ct)
{
	register signed char __res;

	while (1) {
		if ((__res = *cs - *ct++) != 0 || !*cs++)
			break;
	}

	return __res;
}
#endif

#ifndef __HAVE_ARCH_MEMSET
/**
 * memset - Fill a region of memory with the given value
 * @s: Pointer to the start of the area.
 * @c: The byte to fill the area with
 * @count: The size of the area.
 *
 * Do not use memset() to access IO space, use memset_io() instead.
 */
void * memset(void * s,int c,size_t count)
{
	char *xs = (char *) s;

	while (count--)
		*xs++ = c;

	return s;
}
#endif

#ifndef __HAVE_ARCH_MEMCPY
/**
 * memcpy - Copy one area of memory to another
 * @dest: Where to copy to
 * @src: Where to copy from
 * @count: The size of the area.
 *
 * You should not use this function to access IO space, use memcpy_toio()
 * or memcpy_fromio() instead.
 */
void * memcpy(void * dest,const void *src,size_t count)
{
	char *tmp = (char *) dest, *s = (char *) src;

	while (count--)
		*tmp++ = *s++;

	return dest;
}
#endif

#ifndef __HAVE_ARCH_MEMCMP
/**
 * memcmp - Compare two areas of memory
 * @cs: One area of memory
 * @ct: Another area of memory
 * @count: The size of the area.
 */
int memcmp(const void * cs,const void * ct,size_t count)
{
	const unsigned char *su1, *su2;
	int res = 0;

	for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
		if ((res = *su1 - *su2) != 0)
			break;
	return res;
}
#endif

#ifndef __HAVE_ARCH_STRLEN
/**
 * strlen - Find the length of a string
 * @s: The string to be sized
 */
size_t strlen(const char * s)
{
	const char *sc;

	for (sc = s; *sc != '\0'; ++sc)
		/* nothing */;
	return sc - s;
}
#endif

/*
 * print sizes as "xxx kB", "xxx.y kB", "xxx MB" or "xxx.y MB" as needed;
 * allow for optional trailing string (like "\n")
 */
void print_size (ulong size, const char *s)
{
	ulong m, n;
	ulong d = 1 << 20;		/* 1 MB */
	char  c = 'M';

	if (size < d) {			/* print in kB */
		c = 'k';
		d = 1 << 10;
	}

	n = size / d;

	m = (10 * (size - (n * d)) + (d / 2) ) / d;

	if (m >= 10) {
		m -= 10;
		n += 1;
	}

	printk ("%2ld", n);
	if (m) {
		printk (".%ld", m);
	}
	printk (" %cB%s", c, s);
}

unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
{
	unsigned long result = 0,value;

	if (*cp == '0') {
		cp++;
		if ((*cp == 'x') && isxdigit(cp[1])) {
			base = 16;
			cp++;
		}
		if (!base) {
			base = 8;
		}
	}
	if (!base) {
		base = 10;
	}
	while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
	    ? toupper(*cp) : *cp)-'A'+10) < base) {
		result = result*base + value;
		cp++;
	}
	if (endp)
		*endp = (char *)cp;
	return result;
}

long simple_strtol(const char *cp,char **endp,unsigned int base)
{
	if(*cp=='-')
		return -simple_strtoul(cp+1,endp,base);
	return simple_strtoul(cp,endp,base);
}

#ifdef CFG_64BIT_STRTOUL
unsigned long long simple_strtoull (const char *cp, char **endp, unsigned int base)
{
	unsigned long long result = 0, value;

	if (*cp == '0') {
		cp++;
		if ((*cp == 'x') && isxdigit (cp[1])) {
			base = 16;
			cp++;
		}
		if (!base) {
			base = 8;
		}
	}
	if (!base) {
		base = 10;
	}
	while (isxdigit (*cp) && (value = isdigit (*cp)
				? *cp - '0'
				: (islower (*cp) ? toupper (*cp) : *cp) - 'A' + 10) < base) {
		result = result * base + value;
		cp++;
	}
	if (endp)
		*endp = (char *) cp;
	return result;
}
#endif /* CFG_64BIT_STRTOUL */