fxlibc/src/libc/stdio/fputc.c

#include <stdio.h>
#include <string.h>
#include "fileutil.h"

int fputc(int c_int, FILE *fp)
{
	unsigned char c = c_int;

	if(!fp->writable) {
		fp->error = 1;
		return 0;
	}
	if(fp->append && fseek(fp, 0, SEEK_END) == EOF) {
		fp->error = 1;
		return 0;
	}

	if(!fp->buf) {
		ssize_t rc = __fp_write(fp, &c, 1);
		return (rc == 1) ? c : EOF;
	}

	__fp_buffer_mode_write(fp);

	if(fp->bufpos >= fp->bufsize)
		fflush(fp);

	fp->buf[fp->bufpos++] = c;

	if(fp->bufmode == _IOLBF && c == '\n')
		fflush(fp);

	return c;
}