how to force a buffer to behave like a string in C?

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I am receiving a buffer from the internet, I believe that to go through this buffer and find the last character, you need to find the character ' 0'. But there is no ' 0' in a buffer.

It is possible to force this buffer to behave like a string?

c string buffer

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Adds p '\0' buffer. But attention to binary data!!

length = recv(socket, buffer, sizeof buffer - 1, 0);
buffer[length] = 0; // adiciona terminador

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