stadx.c

来自「这是一个潜入式开发的c语言代码」· C语言 代码 · 共 53 行

#include "stadx.h"

REGINT f_min(REGINT a, REGINT b)
{
	return a>b?b:a;
}

VOID f_memcpy(BYTE* to, REGINT buflen, BYTE* from, REGINT limit, REGINT size)
{
	REGINT n = f_min(size,f_min(buflen, limit));

	memset(to, 0, size<buflen?size:buflen);
	memcpy(to, from, n);
}

VOID f_cpname(BYTE* to, REGINT length, CHAR* value)
{
	memset(to, 0, length);

	if(strlen(value)+1 > length)
	{	memcpy(to, value, length);
		*(to+length-1) = 0;
	}
	else
		strcpy(to, value);
}

Boolean f_Seek(REGINT fd, UINT32 offset)
{
	if(lseek(fd, offset, SEEK_SET) < 0)
	{
		DBG_MSG("file seek error\n");
		return False;
	}

	return True;
}

REGINT f_SeekRead(REGINT fd, BYTE* buffer, UINT32 offset, UINT32 size)
{
	if( f_Seek(fd, offset) )
	{
		REGINT ret = read(fd, buffer, size);
		if(ret < 0)
		{
			DBG_MSG("reading error\n");
		}
		return ret;
	}
	else
		return -1;
}