fputc.c

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#include <stdio.h>
#include <stdlib.h>
 
#include "user/common/file.h"
#include "user/common/syscalls.h"
 
int fputc(int c, FILE* stream)
{
    mtx_lock(&stream->mtx);
 
    if (_file_prepare_write(stream) == ERR)
    {
        mtx_unlock(&stream->mtx);
        return EOF;
    }
 
    stream->buf[stream->bufIndex++] = (char)c;
    if ((stream->bufIndex == stream->bufSize) || ((stream->flags & _FILE_LINE_BUFFERED) && ((char)c == '\n')) ||
        (stream->flags & _FILE_UNBUFFERED))
    {
        // buffer filled, unbuffered stream, or end-of-line.
        c = (_file_flush_buffer(stream) != ERR) ? c : EOF;
    }
 
    mtx_unlock(&stream->mtx);
 
    return c;
}