C - Reading from stdin as characters are typed

Question

How do I fill an 80-character buffer with characters as they are being entered or until the carriage return key is pressed, or the buffer is full, whichever occurs first.

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Answer 1

#include 
...
char buf[80];
int i;
for (i = 0; i < sizeof(buf) - 1; i++)
{
    int c = getchar();
    if ( (c == '\n') || (c == EOF) )
    {
        buf[i] = '\0';
        break;
    }
    buf[i] = c;
}
buf[sizeof(buf] - 1] = '\0';