a C standard library for fx Casio calculators
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#include <stdio.h>
#include <unistd.h>
// internal depency
#include "internal/printf.h"
// if the writte syscall do not return the same
// number of bytes that requested, stop the function !
static void disp_fflush(struct printf_opt *opt)
if (opt->buffer_cursor != 0) {
opt->counter += write(opt->fd, opt->buffer, opt->buffer_cursor);
opt->buffer_cursor = 0;
static void disp_char(struct printf_opt *opt, char n)
// Check if we should force flush the internal buffer
if (opt->buffer_cursor >= PRINTF_INTERNAL_BUFFER_SIZE)
// Save char
opt->buffer[opt->buffer_cursor++] = n;
** The functions vdprintf() are equivalent to the dprintf() except that they
** are called with a va_list instead of a variable number of arguments. These
** functions do not call the va_end macro. Because they invoke the va_arg macro,
** the value of ap is undefined after the call.
int vdprintf(int fd, const char *restrict format, va_list ap)
extern int printf_common(struct printf_opt *opt,
const char *restrict format);
struct printf_opt opt;
opt.fd = fd;
opt.disp_char = &disp_char;
opt.disp_fflush = &disp_fflush;
va_copy(opt.ap, ap);
return (printf_common(&opt, format));