30 lines
694 B
C
30 lines
694 B
C
#include <stdio.h>
|
|
|
|
static void disp_char(struct printf_opt *opt, char n)
|
|
{
|
|
// Check write possibility
|
|
if (opt->buffer_cursor < opt->str_size - 1) {
|
|
opt->str[opt->buffer_cursor] = n;
|
|
opt->buffer_cursor = opt->buffer_cursor + 1;
|
|
}
|
|
}
|
|
|
|
static void disp_fflush(struct printf_opt *opt)
|
|
{
|
|
opt->str[opt->buffer_cursor] = '\0';
|
|
}
|
|
|
|
int vsnprintf(char *restrict str, size_t size, const char *restrict format, va_list ap)
|
|
{
|
|
extern int printf_common(struct printf_opt *opt, const char *restrict format);
|
|
struct printf_opt opt;
|
|
|
|
opt.str = str;
|
|
opt.str_size = size;
|
|
opt.disp_char = &disp_char;
|
|
opt.disp_fflush = &disp_fflush;
|
|
va_copy(opt.ap, ap);
|
|
return (printf_common(&opt, format) + 1);
|
|
}
|
|
|