问题
I am trying to read from a socket into a buffer until a certain character is reached using read(fd, buf, BUFFLEN)
.
For example, the socket will receive two lots of information separated by a blank line in one read call.
Is it possible to put the read call in a loop so it stops when it reaches this blank line, then it can read the rest of the information later if it is required?
回答1:
A simple approach would be to read a single byte at a time until the previous byte and the current byte are new-line characters, as two consecutive new-line characters is a blank line:
size_t buf_idx = 0;
char buf[BUFFLEN] = { 0 };
while (buf_idx < BUFFLEN && 1 == read(fd, &buf[buf_idx], 1)
{
if (buf_idx > 0 &&
'\n' == buf[buf_idx] &&
'\n' == buf[buf_idx - 1])
{
break;
}
buf_idx++;
}
Any unread data will have to be read at some point if newly sent data is to be read.
回答2:
You still need to read from the socket if you want to access this information later, otherwise it will be lost. I think best implementation would be to keep looping reading from the socket, while another process/thread is launched to perform any operation you want when a blank like is received.
来源:https://stackoverflow.com/questions/9398436/reading-from-a-socket-until-certain-character-is-in-buffer