用c语言写的读一起源代码

用c语言写的读一行源代码

因为工作需要，用c语言写了一个读一行的函数，供大家参考：

static BOOL readLine(FILE* file, char** ppBuf)
    {
	int   nMax = 128;
	char  szBuf[128];
	char* pAmountBuf = NULL ;
	char* pResult;
	int   nLen = 0;
	int   nAmountLen = 0;
	char* pTmp;
	BOOL  bLoop = TRUE;
	do
	{
		pResult=fgets(szBuf, nMax, file);
		/* handle error */
		if( pResult == NULL && !feof(file) )
		    {
			if( pAmountBuf )
				free( pAmountBuf);
			return FALSE;
		    }
		if( pResult == NULL )
		    {
			break;
		    }
		else if ( (nLen = strlen( szBuf )) < nMax-1 ||
				szBuf[nLen-1] == '\n' 
				) 
		    {
			if( nLen ==0 )
				break;
			bLoop = FALSE;
		    }
		nAmountLen += nLen;
		pTmp = (char*)malloc( sizeof(char)* (nAmountLen + 1) );
		if( pTmp == NULL )
		    {
			if( pAmountBuf )
				free ( pAmountBuf );
			return FALSE;
		    }
		if( pAmountBuf )
		    {
			strcpy(pTmp, pAmountBuf );
			strcat(pTmp, szBuf);
		    }
		else
		    {
			strcpy(pTmp, szBuf);
		    }
		pAmountBuf = pTmp;
	}
	while( bLoop );
	
	if( nAmountLen!=0 && pAmountBuf[nAmountLen-1] == '\n' )
	    {
		pAmountBuf[--nAmountLen]=0;
	    }
	if( nAmountLen!=0 && pAmountBuf[nAmountLen-1] == '\r' )
	    {
		pAmountBuf[--nAmountLen]=0;
	    }
	if( nAmountLen==0 )
	    {
		if( pAmountBuf )
			free( pAmountBuf );
	    }
	else
		*ppBuf=pAmountBuf;
	return nAmountLen!=0;
	
    }