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Agner |
/**************************** printf_light.as ********************************
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* Author: Agner Fog
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* date created: 2021-05-24
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* Last modified: 2021-05-25
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* Version: 1.11
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* Project: ForwardCom library libc_light.li
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* Description: printf, sprintf, snprintf: Print formatted output
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* This version is for small CPUs with limited capabilities
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* The following instructions are avoided: mul, div, push, pop, sys_call.
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* Output to stdout goes directly to output port 10. It does not wait if
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* the output buffer is full.
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*
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* C declarations:
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* int printf (const char * format, ... );
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* int sprintf (char * string, const char * format, ... );
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* int snprintf (char * string, size_t max_length, const char * format, ... );
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*
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* printf: print to stdout
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* sprintf: print to string
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* snprintf: print to string with length limit
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* fprintf: print to file. not implemented yet
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*
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* These functions are following the definitions in the C standard.
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* All standard features are supported, except the following:
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* - cannot print floating point numbers
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* - cannot print octal
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* - cannot print decimal integers with more than 32 bits
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*
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* Copyright 2021 GNU General Public License http://www.gnu.org/licenses
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*****************************************************************************/
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const section read ip
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// call table for dispatching format string specifiers
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call_table: int8 (specif_space-def)/4 // ' ': print space or minus
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int8 0 // !
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int8 0 // "
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int8 (specif_hash-def)/4 // #: prepend 0x
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int8 0 // $
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int8 (specif_percent-def)/4 // %: print percent sign
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int8 0 // &
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int8 0 // '
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int8 0 // (
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int8 0 // )
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int8 (specif_star-def)/4 // *: width specified by parameter
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int8 (specif_plus-def)/4 // +: print sign
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int8 0 // ,
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int8 (specif_minus-def)/4 // -: left justified
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int8 0 // .
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int8 0 // /
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int8 (specif_number-def)/4 // 0
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int8 (specif_number-def)/4 // 1
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int8 (specif_number-def)/4 // 2
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int8 (specif_number-def)/4 // 3
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int8 (specif_number-def)/4 // 4
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int8 (specif_number-def)/4 // 5
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int8 (specif_number-def)/4 // 6
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int8 (specif_number-def)/4 // 7
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int8 (specif_number-def)/4 // 8
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int8 (specif_number-def)/4 // 9
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int8 0 // :
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int8 0 // ;
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int8 0 // <
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int8 0 // =
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int8 0 // >
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int8 0 // ?
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int8 0 // @
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int8 (specif_hex-def)/4 // A: hexadecimal float
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int8 0 // B
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int8 0 // C
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int8 0 // D
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int8 (specif_float-def)/4 // E: float
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int8 (specif_float-def)/4 // F: float
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int8 (specif_float-def)/4 // G: float
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int8 0 // H
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int8 0 // I
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int8 0 // J
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int8 0 // K
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int8 (specif_l-def)/4 // L: long (long double)
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int8 0 // M
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int8 0 // N
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int8 0 // O
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int8 0 // P
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int8 0 // Q
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int8 0 // R
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int8 0 // S
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int8 0 // T
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int8 0 // U
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int8 0 // V
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int8 0 // W
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int8 (specif_hex-def)/4 // X: hexadecimal
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int8 0 // Y
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int8 0 // Z
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int8 0 // [
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int8 0 // \
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int8 0 // ]
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int8 0 // ^
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int8 0 // _
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int8 0 // `
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int8 (specif_hex-def)/4 // a: hexadecimal float
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int8 0 // b
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int8 (specif_char-def)/4 // c: character
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int8 (specif_dec-def)/4 // d: signed decimal
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int8 (specif_float-def)/4 // e: float
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int8 (specif_float-def)/4 // f: float
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int8 (specif_float-def)/4 // g: float
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int8 (specif_h-def)/4 // h: short
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int8 (specif_dec-def)/4 // i: signed decimal
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int8 (specif_l-def)/4 // j: intmax_t
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int8 0 // k
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int8 (specif_l-def)/4 // l: long
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int8 0 // m
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int8 (specif_num-def)/4 // n: read number of characters printed so far
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int8 0 // o
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int8 (specif_hex-def)/4 // p: pointer, print as hexadecimal
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int8 0 // q
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int8 0 // r
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int8 (specif_string-def)/4 // s: string
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int8 (specif_l-def)/4 // t: ptrdiff_t
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int8 (specif_uns-def)/4 // u: unsigned decimal
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int8 0 // v
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int8 0 // w
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int8 (specif_hex-def)/4 // x: hexadecimal
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int8 0 // y
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int8 (specif_l-def)/4 // z: size_t
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const end
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code section execute align = 4 // code section
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// _printf: print formatted string to stdout
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// parameters: r0: format string, r1: parameter list
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_printf function public reguse = 0xF, 0
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int64 r2 = r0 // format string
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int64 r3 = r1 // parameter list
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int64 sp -= 10*8 // start saving registers
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int64 [sp+0x30] = r10 // save r10. The rest are saved under printf_generic
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int64 r10 = address ([char_to_stdout])
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jump printf_generic
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// _sprintf: print formatted string to string buffer
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// parameters: r0: destination string, r1: format string, r2: parameter list
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_sprintf function public reguse = 0xF, 0
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int64 r3 = r2 // parameter list
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int64 r2 = r1 // format string
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int64 r1 = -1 // character count limit = UINT_MAX
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int64 sp -= 10*8 // start saving registers
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int64 [sp+0x30] = r10 // save r10. The rest are saved under printf_generic
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int64 r10 = address ([char_to_string])
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jump printf_generic
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// _snprintf: print formatted string to string buffer with limit
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// parameters: r0: destination string, r1: length limit, r2: format string, r3: parameter list
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_snprintf function public reguse = 0xF, 0
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int64 r1-- // character count limit. make space for terminating zero
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int64 sp -= 10*8 // start saving registers
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int64 [sp+0x30] = r10 // save r10. The rest are saved under printf_generic
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int64 r10 = address ([char_to_string])
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// continue in printf_generic
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printf_generic: // common procedure for all printf variants
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// save r4 - r13
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//int64 sp -= 10*8 // this is done above
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int64 [sp+0x00] = r4
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int64 [sp+0x08] = r5
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int64 [sp+0x10] = r6
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int64 [sp+0x18] = r7
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int64 [sp+0x20] = r8
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int64 [sp+0x28] = r9
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// int64 [sp+0x30] = r10 // r10 saved above
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int64 [sp+0x38] = r11
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int64 [sp+0x40] = r12
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int64 [sp+0x48] = r13
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if (int64 r2 == 0) {jump finish} // format string pointer is null
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int r13 = 0 // reset field width
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int r11 = 0 // reset modifiers
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int r12 = 0 // state start
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// loop through format string
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while (true) {
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int8 r8 = [r2] // read character from format string
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if (int8+ r8 == 0) {break} // end of format string
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int64 r2++ // increment format string pointer
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if (int r12 == 0) { // state start
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if (int8+ r8 == '%') {
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int r12 = 1 // state after '%'
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}
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else {
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call (r10) // print character from format string
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}
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nop
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}
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else { // after '%' or modifier
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int r6 = r8 - ' ' // table index
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int64 r4 = address ([unknown_character])
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if (uint r6 > 91) {
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call (r4) // call unknown_character
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}
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else {
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int64 r5 = address ([call_table])
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int8 call_relative (r4, [r5 + r6*1]) // dispatch format specifier or modifier
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}
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}
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}
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finish:
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// if printing to string, insert terminating zero
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int64 r4 = address ([char_to_string])
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if (uint64 r10 >= r4) {
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int r4 = 0
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int8 [r0] = r4
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}
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int64 r0 = r9 // return number of characters written
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// restore r4 - r13
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int64 r4 = [sp+0x00]
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int64 r5 = [sp+0x08]
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int64 r6 = [sp+0x10]
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int64 r7 = [sp+0x18]
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int64 r8 = [sp+0x20]
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int64 r9 = [sp+0x28]
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int64 r10 = [sp+0x30]
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int64 r11 = [sp+0x38]
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int64 r12 = [sp+0x40]
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int64 r13 = [sp+0x48]
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int64 sp += 10*8
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return // return from _printf, etc.
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/////////////////////////////////////////////////////////////
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// subfunctions for different characters in format string
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/////////////////////////////////////////////////////////////
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specif_space: // ' ': print space or minus
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if (int r12 != 1) {jump unknown_character}
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int r11 |= 8 // set modifier flag
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return
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specif_plus: // +: print sign
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if (int r12 != 1) {jump unknown_character}
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int r11 |= 4 // set modifier flag
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return
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specif_minus: // -: left justified
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if (int r12 != 1) {jump unknown_character}
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int r11 |= 1 // set modifier flag
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return
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specif_hash: // hash sign: print prefix 0x
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if (int r12 != 1) {jump unknown_character}
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int r11 |= 0x10 // set modifier flag
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return
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specif_h: // h: short
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int r4 = test_bits_or(r11, 0x40) // is there a preceding h?
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int r11 |= 0x40 // set modifier flag h
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int r11 |= 0x80, mask = r4 // set modifier flag hh
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int r12 = 3 // state after sub_specifier
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return
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specif_l: // l: long
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int r11 |= 0x20 // set modifier flag l
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int r12 = 3 // state after sub_specifier
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return
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specif_percent: // %: print percent sign
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jump unknown_character // just print % sign and reset state
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specif_star: // *: width specified by parameter
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if (int r12 != 1) {jump unknown_character}
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int r13 = [r3] // read width from paramter
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int64 r3 += 8
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int r12 = 2 // state after width
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int r11 |= 0x100 // set modifier flag
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return
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specif_number: // 0-9
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if (int r12 == 1) {
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if (int r8 == '0') { // leading '0' means print leading zeroes
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int r11 |= 2 // set modifier flag 2
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return
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}
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}
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// number specifies width
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// width = previous_width * 10 + new_digit
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int r4 = r13 << 3 // multiply width by 10
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int r13 <<= 1
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int r13 += r4
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int r8 -= '0' // convert from ASCII
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int r13 += r8 // new width
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int r12 = 2 // state after width
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int r11 |= 0x100 // set modifier flag
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return
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// subfunction for writing to stdout
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char_to_stdout:
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int8 output(r8, r8, 10) // write to stdout
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int64 r9++ // count characters written
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return
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// subfunction for writing to string
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char_to_string:
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int64 r9++ // count characters written or potentially written
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if (uint64 r9 > r1) { // compare with string length limit
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jump char_to_string9 // stop printing
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}
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int8 [r0] = r8 // write to string
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int64 r0++ // increment string pointer
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char_to_string9:
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return
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// %n: read number of characters printed so far
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specif_num: // n: read number of characters printed so far
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int64 r4 = [r3] // read pointer from parameter list
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int64 r3 += 8 // increment parameter list
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int32 [r4] = r9 // save number of characters written
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jump reset_state
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// %c: Print character
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specif_char: // c: print character
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int r13-- // number of leading or trailing spaces to pring
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if (int !(r11 & 1)) { // field is right justified. print leading spaces
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int r8 = ' ' // leading spaces
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for (int; r13 > 0; r13--) {
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call (r10) // print space
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| 334 |
|
|
}
|
| 335 |
|
|
}
|
| 336 |
|
|
int8 r8 = [r3] // read character from parameter list
|
| 337 |
|
|
int64 r3 += 8 // increment parameter list
|
| 338 |
|
|
call (r10) // print character
|
| 339 |
|
|
int r8 = ' ' // print any trailing spaces
|
| 340 |
|
|
for (int; r13 > 0; r13--) {
|
| 341 |
|
|
call (r10) // print space
|
| 342 |
|
|
}
|
| 343 |
|
|
jump reset_state
|
| 344 |
|
|
|
| 345 |
|
|
|
| 346 |
|
|
// %s: Print string
|
| 347 |
|
|
specif_string: // s: string
|
| 348 |
|
|
int64 r6 = [r3] // read string pointer from parameter list
|
| 349 |
|
|
int64 r3 += 8 // increment parameter list
|
| 350 |
|
|
if (int64 r6 == 0) {jump unknown_character} // null string
|
| 351 |
|
|
int r4 = r11 ^ 1 // check if right justified
|
| 352 |
|
|
int16+ test_bits_and(r4, 0x101), jump_false specif_string2
|
| 353 |
|
|
// string is right justified with specified width. check if leading spaces are needed
|
| 354 |
|
|
for (int r5 = 0; r5 < r13; r5++) {
|
| 355 |
|
|
int8 r8 = [r6+r5] // read string character
|
| 356 |
|
|
if (int8+ r8 == 0) {break} // string is shorter. leading spaces needed
|
| 357 |
|
|
}
|
| 358 |
|
|
// print leading spaces
|
| 359 |
|
|
int r8 = ' '
|
| 360 |
|
|
for (int ; r5 < r13; r5++) {
|
| 361 |
|
|
call (r10) // print space
|
| 362 |
|
|
}
|
| 363 |
|
|
int r13 = 0 // avoid printing trailing spaces also
|
| 364 |
|
|
specif_string2:
|
| 365 |
|
|
while (true) {
|
| 366 |
|
|
int8 r8 = [r6] // read character from string
|
| 367 |
|
|
if (int8+ r8 == 0) {break} // end of string
|
| 368 |
|
|
int64 r6++ // increment string pointer
|
| 369 |
|
|
call (r10) // print character
|
| 370 |
|
|
int r13-- // count down field width
|
| 371 |
|
|
}
|
| 372 |
|
|
// print any trailing space
|
| 373 |
|
|
int r8 = ' '
|
| 374 |
|
|
while (int r13 > 0) {
|
| 375 |
|
|
call (r10) // print character
|
| 376 |
|
|
int r13-- // count down field width
|
| 377 |
|
|
}
|
| 378 |
|
|
jump reset_state
|
| 379 |
|
|
|
| 380 |
|
|
|
| 381 |
|
|
// %e, %f, %g: Print floating point number
|
| 382 |
|
|
specif_float:
|
| 383 |
|
|
//jump specif_float1 // (intermediate jump target specif_float placed here to avoid overflow in call table)
|
| 384 |
|
|
|
| 385 |
|
|
// float not implemented. print as %#LX
|
| 386 |
|
|
int r11 |= 0x30 // print 0x prefix, 64 bits
|
| 387 |
|
|
jump specif_hex
|
| 388 |
|
|
|
| 389 |
|
|
|
| 390 |
|
|
// reference point, default in call table, print unknown character:
|
| 391 |
|
|
def: // default, reference point in call table
|
| 392 |
|
|
unknown_character: // unknown character after '%'
|
| 393 |
|
|
call r10 // print character
|
| 394 |
|
|
//jump reset_state
|
| 395 |
|
|
reset_state: // reset state after '%' command
|
| 396 |
|
|
int r11 = 0 // reset modifiers
|
| 397 |
|
|
int r12 = 0 // state start
|
| 398 |
|
|
int r13 = 0 // reset field width
|
| 399 |
|
|
return
|
| 400 |
|
|
|
| 401 |
|
|
|
| 402 |
|
|
// %x: Print hexadecimal
|
| 403 |
|
|
specif_hex: // X: hexadecimal
|
| 404 |
|
|
int r7 = r8 & 0x20 // is lower case
|
| 405 |
|
|
int64 r4 = [r3] // read integer from parameter list
|
| 406 |
|
|
int64 r3 += 8 // increment parameter list
|
| 407 |
|
|
if (int !(r11 & 0x20)) { // check if long int
|
| 408 |
|
|
int32 r4 = r4 // not long. truncate to 32 bits
|
| 409 |
|
|
}
|
| 410 |
|
|
specif_hex2: // entry from %i (decimal) if number too big
|
| 411 |
|
|
int64 r5 = bitscan(r4, 1) // find number of bits
|
| 412 |
|
|
uint32 r5 >>= 2
|
| 413 |
|
|
int32 r5++ // number of digits to print
|
| 414 |
|
|
int r13 -= r5 // number of leading or trailing spaces to print
|
| 415 |
|
|
int r6 = test_bit(r11, 4) // '#' option
|
| 416 |
|
|
int r13 -= 2, mask = r6 // make space of 0x prefix
|
| 417 |
|
|
|
| 418 |
|
|
if (int !(r11 & 1)) { // field is right justified. print leading spaces
|
| 419 |
|
|
int r8 = ' ' // leading spaces
|
| 420 |
|
|
int r6 = test_bit(r11, 1) // get bit 1: leading zeroes
|
| 421 |
|
|
int r8 = '0', mask=r6, fallback=r8 // leading zeroes instead of leading spaces
|
| 422 |
|
|
while (int r13 > 0) { // print r13 leading spaces or zeroes
|
| 423 |
|
|
call r10
|
| 424 |
|
|
int r13--
|
| 425 |
|
|
}
|
| 426 |
|
|
}
|
| 427 |
|
|
|
| 428 |
|
|
if (int r11 & 0x10) { // '#' flag. Print 0x prefix
|
| 429 |
|
|
int r8 = '0'
|
| 430 |
|
|
call r10
|
| 431 |
|
|
int r8 = 'X' | r7 // 'x' or 'X'
|
| 432 |
|
|
call r10
|
| 433 |
|
|
}
|
| 434 |
|
|
|
| 435 |
|
|
// convert to hexadecimal
|
| 436 |
|
|
if (int r5 > 8) { // must use 64 bits
|
| 437 |
|
|
int r6 = 16 - r5 // number of digits to skip
|
| 438 |
|
|
int r6 <<= 2 // number of bits to skip
|
| 439 |
|
|
uint64 r4 <<= r6 // remove leading zero bits
|
| 440 |
|
|
for (int ; r5 > 0; r5--) { // loop for r5 digits
|
| 441 |
|
|
uint64 r4 = rotate(r4, 4) // get digit into low position
|
| 442 |
|
|
int r8 = r4 & 0xF // get digit
|
| 443 |
|
|
int r8 += '0' // convert to ASCII
|
| 444 |
|
|
int r6 = r8 > '9' // digit is A - F
|
| 445 |
|
|
int r8 += 7, mask = r6 // add 7 to get letter A - F
|
| 446 |
|
|
int r8 |= r7 // lower case
|
| 447 |
|
|
call r10 // print character
|
| 448 |
|
|
}
|
| 449 |
|
|
}
|
| 450 |
|
|
else { // use 32 bits. CPU may not support 64 bits
|
| 451 |
|
|
int r6 = 8 - r5 // number of digits to skip
|
| 452 |
|
|
int r6 <<= 2 // number of bits to skip
|
| 453 |
|
|
uint32 r4 <<= r6 // remove leading zero bits
|
| 454 |
|
|
for (int ; r5 > 0; r5--) { // loop for r5 digits
|
| 455 |
|
|
uint32 r4 = rotate(r4, 4) // get digit into low position
|
| 456 |
|
|
int r8 = r4 & 0xF // get digit
|
| 457 |
|
|
int r8 += '0' // convert to ASCII
|
| 458 |
|
|
int r6 = r8 > '9' // digit is A - F
|
| 459 |
|
|
int r8 += 7, mask = r6 // add 7 to get letter A - F
|
| 460 |
|
|
int r8 |= r7 // lower case
|
| 461 |
|
|
call r10 // print character
|
| 462 |
|
|
}
|
| 463 |
|
|
}
|
| 464 |
|
|
// print any trailing spaces
|
| 465 |
|
|
int r8 = ' ' // trailing spaces
|
| 466 |
|
|
while (int r13 > 0) { // print r13 trailing spaces
|
| 467 |
|
|
call r10
|
| 468 |
|
|
int r13--
|
| 469 |
|
|
}
|
| 470 |
|
|
jump reset_state
|
| 471 |
|
|
|
| 472 |
|
|
|
| 473 |
|
|
// %i, %d: Print signed decimal integer
|
| 474 |
|
|
specif_dec: // i: signed decimal
|
| 475 |
|
|
int64 r4 = [r3] // read integer from parameter list
|
| 476 |
|
|
int64 r3 += 8 // increment parameter list
|
| 477 |
|
|
if (int r11 & 0x20) { // %li: 64-bit integer
|
| 478 |
|
|
int64 r5 = test_bit(r4, 63) // get sign bit
|
| 479 |
|
|
int64 r4 = -r4, mask = r5 // change sign if negative
|
| 480 |
|
|
int r11 |= 0x200, mask = r5 // set bit to remember negative
|
| 481 |
|
|
int64 r6 = bitscan(r4, 1) // find number of bits
|
| 482 |
|
|
if (int r6 > 31) { // cannot handle 64 bits decimal. Do hexadecimal instead
|
| 483 |
|
|
int r11 |= 0x11 // prepare for hexadecimal escape. get 0x prefix and left justify
|
| 484 |
|
|
int r7 = 0 // use upper case for hexadecimal escape
|
| 485 |
|
|
if (int8+ r5 & 1) {
|
| 486 |
|
|
int r8 = '-' // print '-'
|
| 487 |
|
|
call r10
|
| 488 |
|
|
}
|
| 489 |
|
|
jump specif_hex2 // print as hexadecimal
|
| 490 |
|
|
}
|
| 491 |
|
|
}
|
| 492 |
|
|
else {
|
| 493 |
|
|
if (int r11 & 0x80) { // %hhi: int8
|
| 494 |
|
|
int32 r5 = test_bit(r4, 7) // get sign bit
|
| 495 |
|
|
int8 r4 = -r4, mask = r5 // change sign if negative. truncate to 8 bits
|
| 496 |
|
|
int r11 |= 0x200, mask = r5 // set bit to remember negative
|
| 497 |
|
|
}
|
| 498 |
|
|
else {
|
| 499 |
|
|
if (int r11 & 0x40) { // %hhi: int16
|
| 500 |
|
|
int32 r5 = test_bit(r4, 15) // get sign bit
|
| 501 |
|
|
int16 r4 = -r4, mask = r5 // change sign if negative. truncate to 16 bits
|
| 502 |
|
|
int r11 |= 0x200, mask = r5 // set bit to remember negative
|
| 503 |
|
|
}
|
| 504 |
|
|
else {
|
| 505 |
|
|
// %i: int32
|
| 506 |
|
|
int32 r5 = test_bit(r4, 31) // get sign bit
|
| 507 |
|
|
int32 r4 = -r4, mask = r5 // change sign if negative. truncate to 16 bits
|
| 508 |
|
|
int r11 |= 0x200, mask = r5 // set bit to remember negative
|
| 509 |
|
|
}
|
| 510 |
|
|
}
|
| 511 |
|
|
}
|
| 512 |
|
|
jump specif_uns2 // sign has been stored in r11. continue in unsigned
|
| 513 |
|
|
|
| 514 |
|
|
|
| 515 |
|
|
// %u: Print unsigned decimal integer
|
| 516 |
|
|
specif_uns: // u: unsigned decimal
|
| 517 |
|
|
int64 r4 = [r3] // read integer from parameter list
|
| 518 |
|
|
int64 r3 += 8 // increment parameter list
|
| 519 |
|
|
if (int r11 & 0x20) { // %li: 64-bit integer
|
| 520 |
|
|
int64 r6 = bitscan(r4, 1) // find number of bits
|
| 521 |
|
|
int r8 |= 0x10 // prepare for hexadecimal escape. get 0x prefix
|
| 522 |
|
|
int r7 = 0 // use upper case for hexadecimal escape
|
| 523 |
|
|
if (int r6 > 31) {jump specif_hex2}// cannot handle 64 bits decimal. Do hexadecimal instead
|
| 524 |
|
|
}
|
| 525 |
|
|
|
| 526 |
|
|
specif_uns2:
|
| 527 |
|
|
int64 sp -= 8 // save r14
|
| 528 |
|
|
int64 [sp] = r14
|
| 529 |
|
|
|
| 530 |
|
|
// 32 bit decimal signed or unsigned
|
| 531 |
|
|
// First two BCD digits are made with simple subtraction to avoid the need for a larger bit field
|
| 532 |
|
|
int r5 = 0 // upper two BCD digits
|
| 533 |
|
|
|
| 534 |
|
|
while (uint32 r4 >= 1000000000) {
|
| 535 |
|
|
nop
|
| 536 |
|
|
uint32 r4 -= 1000000000
|
| 537 |
|
|
uint32 r5 += 0x10
|
| 538 |
|
|
nop
|
| 539 |
|
|
}
|
| 540 |
|
|
while (uint32 r4 >= 100000000) {
|
| 541 |
|
|
uint32 r4 -= 100000000
|
| 542 |
|
|
uint32 r5 += 0x01
|
| 543 |
|
|
}
|
| 544 |
|
|
|
| 545 |
|
|
// Generate 8 BCD digits using double dabble algorithm
|
| 546 |
|
|
int32 r14 = 0 // generate BCD in r14
|
| 547 |
|
|
for (int r6 = 0; r6 < 32; r6++) { // loop for 32 bits
|
| 548 |
|
|
int32 r7 = r14 + 0x33333333 // digit values 5-9 will set bit 3 in each 4-bit nibble
|
| 549 |
|
|
int32 r7 &= 0x88888888 // isolate bit 3 in each nibble
|
| 550 |
|
|
int32 r8 = r7 >> 3 // generate value 3 in nibbles with value 5-9
|
| 551 |
|
|
int32 r7 >>= 2
|
| 552 |
|
|
int32 r7 |= r8 // this will have 3 for each nibble with a value 5-9
|
| 553 |
|
|
int32 r14 += r7 // add 3 to nibble values 5-9 to generate 8-12
|
| 554 |
|
|
int32 r14 = funnel_shift(r4, r14, 31) // shift most significant bit of r4 into r14
|
| 555 |
|
|
int32 r4 <<= 1
|
| 556 |
|
|
}
|
| 557 |
|
|
// r5:r14 = BCD value
|
| 558 |
|
|
|
| 559 |
|
|
// determine width
|
| 560 |
|
|
int r6 = bitscan(r14, 1) // number of significant bits
|
| 561 |
|
|
uint r6 >>= 2 // number of significant digits in low part
|
| 562 |
|
|
int r6++ // number of digits in low part
|
| 563 |
|
|
if (int r5 != 0) { // high part is nonzero
|
| 564 |
|
|
int r6 = bitscan(r5, 1) // find number of digits in high part
|
| 565 |
|
|
uint r6 >>= 2
|
| 566 |
|
|
int r6 += 9 // number of digits total
|
| 567 |
|
|
}
|
| 568 |
|
|
int r7 = test_bits_or(r11, 0x20C) // leading sign needed
|
| 569 |
|
|
int r6 += r7 // number of characters needed
|
| 570 |
|
|
int r13 -= r6 // number of leading or trailing spaces needed
|
| 571 |
|
|
|
| 572 |
|
|
if (int !(r11 & 1)) { // right justified
|
| 573 |
|
|
int r6 = r13 > 0 && r7 // leading sign && leading spaces
|
| 574 |
|
|
int r4 = test_bit(r11, 1), options=1, fallback=r6 // leading zeroes and leading sign. sign must come first
|
| 575 |
|
|
int r8 = ' ' // leading sign to print
|
| 576 |
|
|
int r6 = test_bit(r11, 2) // flag for '+' prefix
|
| 577 |
|
|
int r8 = '+', mask=r6, fallback=r8 // leading + required if not negative
|
| 578 |
|
|
int r6 = test_bit(r11, 9) // flag for negative
|
| 579 |
|
|
int r8 = '-', mask=r6, fallback=r8 // leading -. value is negative
|
| 580 |
|
|
if (int r4 & 1) { // sign must come before leading zeroes
|
| 581 |
|
|
call r10 // print leading sign
|
| 582 |
|
|
int r7 = 0 // remember leading sign has been written
|
| 583 |
|
|
}
|
| 584 |
|
|
// print leading spaces or zeroes
|
| 585 |
|
|
int r8 = ' ' // space
|
| 586 |
|
|
int r6 = test_bit(r11, 1) // flag for leading zeroes
|
| 587 |
|
|
int r8 = '0', mask=r6, fallback=r8
|
| 588 |
|
|
while (int r13 > 0) { // write leading spaces or zeroes
|
| 589 |
|
|
call r10
|
| 590 |
|
|
int r13--
|
| 591 |
|
|
}
|
| 592 |
|
|
}
|
| 593 |
|
|
if (int r7 & 1) { // sign after leading spaces
|
| 594 |
|
|
int r8 = ' ' // space
|
| 595 |
|
|
int r6 = test_bit(r11, 2) // flag for '+' prefix
|
| 596 |
|
|
int r8 = '+', mask=r6, fallback=r8 // leading + required if not negative
|
| 597 |
|
|
int r6 = test_bit(r11, 9) // flag for negative
|
| 598 |
|
|
int r8 = '-', mask=r6, fallback=r8 // leading -. value is negative
|
| 599 |
|
|
call r10 // write sign
|
| 600 |
|
|
}
|
| 601 |
|
|
|
| 602 |
|
|
int r4 = 0 // remember if first digit has been printed
|
| 603 |
|
|
|
| 604 |
|
|
// print high two digits
|
| 605 |
|
|
uint32 r5 <<= 24 // left justify high part
|
| 606 |
|
|
for (int r6 = 2; r6 > 0; r6--) { // print two high digits if any
|
| 607 |
|
|
int32 r5 = rotate(r5, 4) // get most significant digit first
|
| 608 |
|
|
int8 r8 = r5 & 0x0F
|
| 609 |
|
|
int r4 = (r8 != 0) || r4 // digit has been printed
|
| 610 |
|
|
int8 r8 += '0' // convert to ASCII
|
| 611 |
|
|
if (int r4 != 0) {
|
| 612 |
|
|
call r10 // print character to stdout
|
| 613 |
|
|
}
|
| 614 |
|
|
}
|
| 615 |
|
|
|
| 616 |
|
|
// print low 8 decimal digits
|
| 617 |
|
|
for (int r6 = 8; r6 > 0; r6--) {
|
| 618 |
|
|
int32 r14 = rotate(r14, 4) // get most significant digit first
|
| 619 |
|
|
int8 r8 = r14 & 0x0F
|
| 620 |
|
|
int r4 = (r8 != 0) || r4 // digit has been printed
|
| 621 |
|
|
int r4 = (r6 == 1) || r4 // last digit must be printed
|
| 622 |
|
|
int8 r8 += '0' // convert to ASCII
|
| 623 |
|
|
if (int r4 != 0) {
|
| 624 |
|
|
call r10 // print character to stdout
|
| 625 |
|
|
}
|
| 626 |
|
|
}
|
| 627 |
|
|
|
| 628 |
|
|
// print trailing spaces
|
| 629 |
|
|
int r8 = ' ' // space
|
| 630 |
|
|
while (int r13 > 0) { // write trailing spaces
|
| 631 |
|
|
call r10
|
| 632 |
|
|
int r13--
|
| 633 |
|
|
}
|
| 634 |
|
|
|
| 635 |
|
|
int64 r14 = [sp] // restore r14
|
| 636 |
|
|
int64 sp += 8
|
| 637 |
|
|
|
| 638 |
|
|
jump reset_state // finished
|
| 639 |
|
|
|
| 640 |
|
|
|
| 641 |
|
|
// %e, %f, %g: Print floating point number. not implemented
|
| 642 |
|
|
specif_float1:
|
| 643 |
|
|
nop
|
| 644 |
|
|
jump reset_state // finished
|
| 645 |
|
|
|
| 646 |
|
|
code end
|
