f_system.c

来自「基于arm9的,usb设备(u盘)的读写操作实现.」· C语言 代码 · 共 98 行

/***************************************************************/
/*
 * F_system.c, 20070206, denny
 *
 * A Marconix Software Product
 * Copyright(c) Marconix Co., Ltd. 2007
 * All Rights Reserved. Reproduction, adaption, or
 * translation without prior written permission is
 * prohibited, except as allowed under the copyright laws.
 */
/***************************************************************/

#include "inc.h" 
#include "F_system.h"

u8 Intnum2Char(u8 Intnum)
{
	if(Intnum>9)
		return (0x41 + Intnum - 10);
	else
		return (0x30 + Intnum);
}

char *strupr(char *string)
{
	unsigned char i=0;

	do
	{
		if(string[i]>='a'&&string[i]<='z')
			string[i] -= 0x20;
		i++;
	}while(string[i]!='\0');

	return NULL;
}

char *strlwr(char *string)
{
	unsigned char i=0;

	do
	{
		if(string[i]>='A' && string[i]<='Z')
			string[i]+=0x20;
		i++;
	}while(string[i]!='\0');
}

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;
}


char *strcpy(char *dest, char *src)
{
	u16 i,j;

	for(i=0;; i++)
	{
		if(src[i]!=0)
			dest[i]=src[i];
		else{
			dest[i]='\0';
			break;
		}
	}
	return NULL;
}

int strcmp(const char *s1, const char *s2)
{
	u16 i;

	for(i=0; ; i++)
	{
		if(s1[i] != s2[i])
			return 1;
		if(s1[i] =='\0' )
			break;
	}
	return 0;
}