readline.c

来自「一个很好的unix网络编程框架」· C语言 代码 · 共 41 行

#include "../etcp.h"

/* readline - read a newline terminated record */
int readline( SOCKET fd, char *bufptr, size_t len )
{
	char *bufx = bufptr;
	static char *bp;
	static int cnt = 0;
	static char b[ 1500 ];
	char c;

	while ( --len > 0 )
	{
		if ( --cnt <= 0 )
		{
			cnt = recv( fd, b, sizeof( b ), 0 );
			if ( cnt < 0 )
			{
				if ( errno == EINTR )
				{
					len++;		/* the while will decrement */
					continue;
				}
				return -1;
			}
			if ( cnt == 0 )
				return 0;
			bp = b;
		}
		c = *bp++;
		*bufptr++ = c;
		if ( c == '\n' )
		{
			*bufptr = '\0';
			return bufptr - bufx;
		}
	}
	set_errno( EMSGSIZE );
	return -1;
}