25 static char *write_num(char *str, ul num, int base, int field_width, int precision, int flags);
27 static char *write_float_point_num(char *str, double num, int field_width, int precision, int flags…
66     int precision;   //精度  in __do_vsprintf()  local
154         precision = -1;  in __do_vsprintf()
160                 precision = va_arg(args, int);  in __do_vsprintf()
165                 precision = skip_and_atoi(&fmt);  in __do_vsprintf()
216             if (precision < 0)  in __do_vsprintf()
219                 precision = len;  in __do_vsprintf()
222             else if (len > precision)  in __do_vsprintf()
224                 len = precision;  in __do_vsprintf()
255                 str = write_num(str, va_arg(args, long long), 8, field_width, precision, flags);  in __do_vsprintf()
257                 str = write_num(str, va_arg(args, int), 8, field_width, precision, flags);  in __do_vsprintf()
268 …      str = write_num(str, (unsigned long)va_arg(args, void *), 16, field_width, precision, flags);  in __do_vsprintf()
278                 str = write_num(str, va_arg(args, ll), 16, field_width, precision, flags);  in __do_vsprintf()
280                 str = write_num(str, va_arg(args, int), 16, field_width, precision, flags);  in __do_vsprintf()
289                 str = write_num(str, va_arg(args, long long), 10, field_width, precision, flags);  in __do_vsprintf()
291                 str = write_num(str, va_arg(args, int), 10, field_width, precision, flags);  in __do_vsprintf()
297 …         str = write_num(str, va_arg(args, unsigned long long), 10, field_width, precision, flags);  in __do_vsprintf()
299                 str = write_num(str, va_arg(args, unsigned int), 10, field_width, precision, flags);  in __do_vsprintf()
318             if (precision < 0)  in __do_vsprintf()
319                 precision = 3;  in __do_vsprintf()
321             str = write_float_point_num(str, va_arg(args, double), field_width, precision, flags);  in __do_vsprintf()
383 static char *write_num(char *str, ul num, int base, int field_width, int precision, int flags)  in write_num()  argument
455     if (js_num > precision)  in write_num()
456         precision = js_num;  in write_num()
458     field_width -= precision;  in write_num()
478     while (js_num < precision)  in write_num()
480         --precision;  in write_num()
493 static char *write_float_point_num(char *str, double num, int field_width, int precision, int flags)  in write_float_point_num()  argument
532     uint64_t num_decimal = (uint64_t)(round(1.0 * (num - num_z) * pow(10, precision))); // 获取小数部分  in write_float_point_num()
552     field_width -= (precision + 1 + js_num_z);  in write_float_point_num()
572     for (int i = 0; i < precision && js_num_d-- > 0; ++i)  in write_float_point_num()
575     while (total_dec_count < precision)  in write_float_point_num()