4.25作业

#include <iohead.h>
int main(int argc, const char *argv[])
{
	umask(0);
	int p1=open("./5_rdon.c",O_RDONLY);
	int p2=open("./cp_5",O_WRONLY|O_CREAT|O_TRUNC,0777);
	if(EOF==p1||EOF==p2)
	{
		ERRLOG("open error");
	}
	char str[128]={0};
	ssize_t ret;
	while(1)
	{
		ret=read(p1,str,sizeof(str)-1);
		if(ret==0)
		{
			printf("读取到结尾\n");
			break;
		}
		else if(-1==ret)
		{
			ERRLOG("read error");
		}
		if(0==write(p2,str,sizeof(str)-1))
		{
			printf("write error\n");
			return -1;
		}
	}
	if(-1==close(p1))
	{
		ERRLOG("close error");
	}
	if(-1==close(p2))
	{
		ERRLOG("close error");
	}
	return 0;
}

 

#include <iohead.h>
int main(int argc, const char *argv[])
{
	int p1=open("./1_cp.c",O_RDONLY);
	if(p1==EOF)
	{
		ERRLOG("error open");
	}
	char str[128]={0};
	int count=0;
	ssize_t ret;
	while(1)
	{
		if(0==(ret=read(p1,str,sizeof(str)-1)))
		{
			printf("end\n");
			break;
		}
		else if(-1==ret)
		{
			ERRLOG("read error");
		}
		str[ret]='\0';
		char *p=str;
		while(*p)
		{
			if(*p=='\n')
			count++;
			p++;
		}
	
	}
	printf("%d\n",count);
	if(-1==close(p1))
	{
		ERRLOG("close");
	}
	return 0;
}