linkify

# some utilities for converting numbers to/from hex
# lowercase letters only for now

== code
#   instruction                     effective address                                                   register    displacement    immediate
# . op          subop               mod             rm32          base        index         scale       r32
# . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes

is-hex-int?:  # in : (address slice) -> EAX : boolean
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # . save registers
    51/push-ECX
    52/push-EDX
    53/push-EBX
    # ECX = s
    8b/copy                         1/mod/*+disp8   5/rm32/EBP    .           .             .           1/r32/ECX   8/disp8         .                 # copy *(EBP+8) to ECX
    # EDX = s->end
    8b/copy                         1/mod/*+disp8   1/rm32/ECX    .           .             .           2/r32/EDX   4/disp8         .                 # copy *(ECX+4) to EDX
    # curr/ECX = s->start
    8b/copy                         0/mod/indirect  1/rm32/ECX    .           .             .           1/r32/ECX   .               .                 # copy *ECX to ECX
    # if s is empty return false
    b8/copy-to-EAX  0/imm32/false
    39/compare                      3/mod/direct    1/rm32/ECX    .           .             .           2/r32/EDX   .               .                 # compare ECX with EDX
    7d/jump-if-greater-or-equal  $is-hex-int?:end/disp8
    # skip past leading '-'
    # . if (*curr == '-') ++curr
    31/xor                          3/mod/direct    3/rm32/EBX    .           .             .           3/r32/EBX   .               .                 # clear EBX
    8a/copy-byte                    0/mod/indirect  1/rm32/ECX    .           .             .           3/r32/BL    .               .                 # copy byte at *ECX to BL
    81          7/subop/compare     3/mod/direct    3/rm32/EBX    .           .             .           .           .               0x2d/imm32/-      # compare EBX
    75/jump-if-not-equal  $is-hex-int?:initial-0/disp8
    # . ++curr
    41/increment-ECX
    # skip past leading '0x'
$is-hex-int?:initial-0:
    # . if (*curr != '0') jump to loop
    31/xor                          3/mod/direct    3/rm32/EBX    .           .             .           3/r32/EBX   .               .                 # clear EBX
    8a/copy-byte                    0/mod/indirect  1/rm32/ECX    .           .             .           3/r32/BL    .               .                 # copy byte at *ECX to BL
    81          7/subop/compare     3/mod/direct    3/rm32/EBX    .           .             .           .           .               0x30/imm32/0      # compare EBX
    75/jump-if-not-equal  $is-hex-int?:loop/disp8
    # . ++curr
    41/increment-ECX
$is-hex-int?:initial-0x:
    # . if (curr >= in->end) return true
    39/compare                      3/mod/direct    1/rm32/ECX    .           .             .           2/r32/EDX   .               .                 # compare ECX with EDX
    7d/jump-if-greater-or-equal  $is-hex-int?:true/disp8
    # . if (*curr != 'x') jump to loop  # the previous '0' is still valid so doesn't need to be checked again
    31/xor                          3/mod/direct    3/rm32/EBX    .           .             .           3/r32/EBX   .               .                 # clear EBX
    8a/copy-byte                    0/mod/indirect  1/rm32/ECX    .           .             .           3/r32/BL    .               .                 # copy byte at *ECX to BL
    81          7/subop/compare     3/mod/direct    3/rm32/EBX    .           .             .           .           .               0x78/imm32/x      # compare EBX
    75/jump-if-not-equal  $is-hex-int?:loop/disp8
    # . ++curr
    41/increment-ECX
$is-hex-int?:loop:
    # if (curr >= in->end) return true
    39/compare                      3/mod/direct    1/rm32/ECX    .           .             .           2/r32/EDX   .               .                 # compare ECX with EDX
    7d/jump-if-greater-or-equal  $is-hex-int?:true/disp8
    # EAX = is-hex-digit?(*curr)
    # . . push args
    8a/copy-byte                    0/mod/indirect  1/rm32/ECX    .           .             .           0/r32/AL    .               .                 # copy byte at *ECX to AL
    50/push-EAX
    # . . call
    e8/call  is-hex-digit?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # if (EAX == false) return false
    3d/compare-EAX-and  0/imm32
    74/jump-if-equal  $is-hex-int?:end/disp8
    # ++curr
    41/increment-ECX
    # loop
    eb/jump  $is-hex-int?:loop/disp8
$is-hex-int?:true:
    # return true
    b8/copy-to-EAX  1/imm32/true
$is-hex-int?:end:
    # . restore registers
    5b/pop-to-EBX
    5a/pop-to-EDX
    59/pop-to-ECX
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-is-hex-int:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "34"
    68/push  _test-slice-hex-int-end/imm32
    68/push  _test-slice-hex-int/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = is-hex-int?(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  is-hex-int?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 1, msg)
    # . . push args
    68/push  "F - test-is-hex-int"/imm32
    68/push  1/imm32/true
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-is-hex-int-handles-letters:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "34a"
    68/push  _test-slice-hex-int-letters-end/imm32
    68/push  _test-slice-hex-int-letters/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = is-hex-int?(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  is-hex-int?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 1, msg)
    # . . push args
    68/push  "F - test-is-hex-int-handles-letters"/imm32
    68/push  1/imm32/true
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-is-hex-int-with-trailing-char:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "34q"
    68/push  _test-slice-digits-and-char-end/imm32
    68/push  _test-slice-digits-and-char/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = is-hex-int?(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  is-hex-int?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0, msg)
    # . . push args
    68/push  "F - test-is-hex-int-with-trailing-char"/imm32
    68/push  0/imm32/false
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-is-hex-int-with-leading-char:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "q34"
    68/push  _test-slice-char-and-digits-end/imm32
    68/push  _test-slice-char-and-digits/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = is-hex-int?(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  is-hex-int?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0, msg)
    # . . push args
    68/push  "F - test-is-hex-int-with-leading-char"/imm32
    68/push  0/imm32/false
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-is-hex-int-empty:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = ""
    68/push  _test-slice-empty-end/imm32
    68/push  _test-slice-empty/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = is-hex-int?(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  is-hex-int?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0, msg)
    # . . push args
    68/push  "F - test-is-hex-int-empty"/imm32
    68/push  0/imm32/false
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-is-hex-int-handles-0x-prefix:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "0x3a"
    68/push  _test-slice-hex-int-with-0x-prefix-end/imm32
    68/push  _test-slice-hex-int-with-0x-prefix/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = is-hex-int?(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  is-hex-int?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 1, msg)
    # . . push args
    68/push  "F - test-is-hex-int-handles-0x-prefix"/imm32
    68/push  1/imm32/true
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-is-hex-int-handles-negative:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "-34a"
    68/push  _test-slice-hex-int-letters-end/imm32
    68/push  _test-slice-hex-int-letters-negative/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = is-hex-int?(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  is-hex-int?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 1, msg)
    # . . push args
    68/push  "F - test-is-hex-int-handles-negative"/imm32
    68/push  1/imm32/true
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-is-hex-int-handles-negative-0x-prefix:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "-0x3a"
    68/push  _test-slice-hex-int-with-0x-prefix-end/imm32
    68/push  _test-slice-hex-int-with-0x-prefix-negative/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = is-hex-int?(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  is-hex-int?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 1, msg)
    # . . push args
    68/push  "F - test-is-hex-int-handles-negative-0x-prefix"/imm32
    68/push  1/imm32/true
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

parse-hex-int:  # in : (address slice) -> result/EAX
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # . save registers
    51/push-ECX
    52/push-EDX
    53/push-EBX
    56/push-ESI
    # result/EBX = 0
    31/xor                          3/mod/direct    3/rm32/EBX    .           .             .           3/r32/EBX   .               .                 # clear EBX
    # ECX = s
    8b/copy                         1/mod/*+disp8   5/rm32/EBP    .           .             .           1/r32/ECX   8/disp8         .                 # copy *(EBP+8) to ECX
    # EDX = s->end
    8b/copy                         1/mod/*+disp8   1/rm32/ECX    .           .             .           2/r32/EDX   4/disp8         .                 # copy *(ECX+4) to EDX
    # curr/ECX = s->start
    8b/copy                         0/mod/indirect  1/rm32/ECX    .           .             .           1/r32/ECX   .               .                 # copy *ECX to ECX
    # negate?/ESI = false
    31/xor                          3/mod/direct    6/rm32/ESI    .           .             .           6/r32/ESI   .               .                 # clear ESI
$parse-hex-int:negative:
    # . if (*curr == '-') negate = true
    31/xor                          3/mod/direct    0/rm32/EAX    .           .             .           0/r32/EAX   .               .                 # clear EAX
    8a/copy-byte                    0/mod/indirect  1/rm32/ECX    .           .             .           0/r32/AL    .               .                 # copy byte at *ECX to AL
    3d/compare-EAX-and  0x2d/imm32/-
    75/jump-if-not-equal  $parse-hex-int:initial-0/disp8
    # . ++curr
    41/increment-ECX
    # . negate = true
    be/copy-to-ESI  1/imm32/true
$parse-hex-int:initial-0:
    # skip past leading '0x'
    # . if (*curr != '0') jump to loop
    8a/copy-byte                    0/mod/indirect  1/rm32/ECX    .           .             .           0/r32/AL    .               .                 # copy byte at *ECX to AL
    3d/compare-EAX-and  0x30/imm32/0
    75/jump-if-not-equal  $parse-hex-int:loop/disp8
    # . ++curr
    41/increment-ECX
$parse-hex-int:initial-0x:
    # . if (curr >= in->end) return result
    39/compare                      3/mod/direct    1/rm32/ECX    .           .             .           2/r32/EDX   .               .                 # compare ECX with EDX
    7d/jump-if-greater-or-equal  $parse-hex-int:end/disp8
    # . if (*curr != 'x') jump to loop  # the previous '0' is still valid so doesn't need to be checked again
    31/xor                          3/mod/direct    0/rm32/EAX    .           .             .           0/r32/EAX   .               .                 # clear EAX
    8a/copy-byte                    0/mod/indirect  1/rm32/ECX    .           .             .           0/r32/AL    .               .                 # copy byte at *ECX to AL
    3d/compare-EAX-and  0x78/imm32/x
    75/jump-if-not-equal  $parse-hex-int:loop/disp8
    # . ++curr
    41/increment-ECX
$parse-hex-int:loop:
    # if (curr >= in->end) break
    39/compare                      3/mod/direct    1/rm32/ECX    .           .             .           2/r32/EDX   .               .                 # compare ECX with EDX
    7d/jump-if-greater-or-equal  $parse-hex-int:negate/disp8
    # EAX = from-hex-char(*curr)
    # . . copy arg to EAX
    8a/copy-byte                    0/mod/indirect  1/rm32/ECX    .           .             .           0/r32/AL    .               .                 # copy byte at *ECX to AL
    # . . call
    e8/call  from-hex-char/disp32
    # result = result * 16 + EAX
    c1/shift    4/subop/left        3/mod/direct    3/rm32/EBX    .           .             .           .           .               4/imm8            # shift EBX left by 4 bits
    01/add                          3/mod/direct    3/rm32/EBX    .           .             .           0/r32/EAX   .               .                 # add EAX to EBX
    # ++curr
    41/increment-ECX
    # loop
    eb/jump  $parse-hex-int:loop/disp8
$parse-hex-int:negate:
    81          7/subop/compare     3/mod/direct    6/rm32/ESI    .           .             .           .           .               0/imm32           # compare ESI
    74/jump-if-equal  $parse-hex-int:end/disp8
    f7          3/subop/negate      3/mod/direct    3/rm32/EBX    .           .             .           .           .               .                 # negate EBX
$parse-hex-int:end:
    89/copy                         3/mod/direct    0/rm32/EAX    .           .             .           3/r32/EBX   .               .                 # copy EBX to EAX
    # . restore registers
    5e/pop-to-ESI
    5b/pop-to-EBX
    5a/pop-to-EDX
    59/pop-to-ECX
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-parse-hex-int-single-digit:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "a"
    68/push  _test-slice-hex-int-single-letter-end/imm32
    68/push  _test-slice-hex-int-single-letter/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = parse-hex-int(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  parse-hex-int/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0xa, msg)
    # . . push args
    68/push  "F - test-parse-hex-int-single-digit"/imm32
    68/push  0xa/imm32
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-parse-hex-int-multi-digit:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "34a"
    68/push  _test-slice-hex-int-letters-end/imm32
    68/push  _test-slice-hex-int-letters/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = parse-hex-int(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  parse-hex-int/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0x34a, msg)
    # . . push args
    68/push  "F - test-parse-hex-int-multi-digit"/imm32
    68/push  0x34a/imm32
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-parse-hex-int-0x-prefix:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "0x34"
    68/push  _test-slice-hex-int-with-0x-prefix-end/imm32
    68/push  _test-slice-hex-int-with-0x-prefix/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = parse-hex-int(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  parse-hex-int/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0x34a, msg)
    # . . push args
    68/push  "F - test-parse-hex-int-0x-prefix"/imm32
    68/push  0x34/imm32
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-parse-hex-int-zero:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "0"
    68/push  _test-slice-hex-int-zero-end/imm32
    68/push  _test-slice-hex-int-zero/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = parse-hex-int(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  parse-hex-int/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0x34a, msg)
    # . . push args
    68/push  "F - test-parse-hex-int-zero"/imm32
    68/push  0/imm32
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-parse-hex-int-0-prefix:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "03"
    68/push  _test-slice-hex-int-with-0-prefix-end/imm32
    68/push  _test-slice-hex-int-with-0-prefix/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = parse-hex-int(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  parse-hex-int/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0x3, msg)
    # . . push args
    68/push  "F - test-parse-hex-int-0-prefix"/imm32
    68/push  0x3/imm32
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-parse-hex-int-negative:
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # var slice/ECX = "-03"
    68/push  _test-slice-hex-int-negative-with-0-prefix-end/imm32
    68/push  _test-slice-hex-int-negative-with-0-prefix/imm32
    89/copy                         3/mod/direct    1/rm32/ECX    .           .             .           4/r32/ESP   .               .                 # copy ESP to ECX
    # EAX = parse-hex-int(slice)
    # . . push args
    51/push-ECX
    # . . call
    e8/call  parse-hex-int/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0xfffffffd, msg)
    # . . push args
    68/push  "F - test-parse-hex-int-negative"/imm32
    68/push  0xfffffffd/imm32
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

is-hex-digit?:  # c : byte -> EAX : boolean
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # . save registers
    51/push-ECX
    # ECX = c
    8b/copy                         1/mod/*+disp8   5/rm32/EBP    .           .             .           1/r32/ECX   8/disp8         .                 # copy *(EBP+8) to ECX
    # return false if c < '0'
    b8/copy-to-EAX  0/imm32/false
    81          7/subop/compare     3/mod/direct    1/rm32/ECX    .           .             .           .           .               0x30/imm32        # compare ECX
    7c/jump-if-lesser  $is-hex-digit?:end/disp8
    # return false if c > 'f'
    81          7/subop/compare     3/mod/direct    1/rm32/ECX    .           .             .           .           .               0x66/imm32        # compare ECX
    7f/jump-if-greater  $is-hex-digit?:end/disp8
    # return true if c <= '9'
    b8/copy-to-EAX  1/imm32/true
    81          7/subop/compare     3/mod/direct    1/rm32/ECX    .           .             .           .           .               0x39/imm32        # compare ECX
    7e/jump-if-lesser-or-equal  $is-hex-digit?:end/disp8
    # return true if c >= 'a'
    81          7/subop/compare     3/mod/direct    1/rm32/ECX    .           .             .           .           .               0x61/imm32        # compare ECX
    7d/jump-if-greater-or-equal  $is-hex-digit?:end/disp8
    # otherwise return false
    b8/copy-to-EAX  0/imm32/false
$is-hex-digit?:end:
    # . restore registers
    59/pop-to-ECX
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

test-hex-below-0:
    # EAX = is-hex-digit?(0x2f)
    # . . push args
    68/push  0x2f/imm32
    # . . call
    e8/call  is-hex-digit?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0, msg)
    # . . push args
    68/push  "F - test-hex-below-0"/imm32
    68/push  0/imm32/false
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    c3/return

test-hex-0-to-9:
    # EAX = is-hex-digit?(0x30)
    # . . push args
    68/push  0x30/imm32
    # . . call
    e8/call  is-hex-digit?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 1, msg)
    # . . push args
    68/push  "F - test-hex-at-0"/imm32
    68/push  1/imm32/true
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # EAX = is-hex-digit?(0x39)
    # . . push args
    68/push  0x39/imm32
    # . . call
    e8/call  is-hex-digit?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 1, msg)
    # . . push args
    68/push  "F - test-hex-at-9"/imm32
    68/push  1/imm32/true
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    c3/return

test-hex-above-9-to-a:
    # EAX = is-hex-digit?(0x3a)
    # . . push args
    68/push  0x3a/imm32
    # . . call
    e8/call  is-hex-digit?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0, msg)
    # . . push args
    68/push  "F - test-hex-above-9-to-a"/imm32
    68/push  0/imm32/false
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    c3/return

test-hex-a-to-f:
    # EAX = is-hex-digit?(0x61)
    # . . push args
    68/push  0x61/imm32
    # . . call
    e8/call  is-hex-digit?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 1, msg)
    # . . push args
    68/push  "F - test-hex-at-a"/imm32
    68/push  1/imm32/true
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # EAX = is-hex-digit?(0x66)
    # . . push args
    68/push  0x66/imm32
    # . . call
    e8/call  is-hex-digit?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 1, msg)
    # . . push args
    68/push  "F - test-hex-at-f"/imm32
    68/push  1/imm32/true
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    c3/return

test-hex-above-f:
    # EAX = is-hex-digit?(0x67)
    # . . push args
    68/push  0x67/imm32
    # . . call
    e8/call  is-hex-digit?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0, msg)
    # . . push args
    68/push  "F - test-hex-above-f"/imm32
    68/push  0/imm32/false
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    c3/return

from-hex-char:  # in/EAX : byte -> out/EAX : num
    # no error checking; accepts argument in EAX
    # if (EAX <= '9') return EAX - '0'
    3d/compare-EAX-with  0x39/imm32/9
    7f/jump-if-greater  $from-hex-char:else/disp8
    2d/subtract-from-EAX  0x30/imm32/0
    c3/return
$from-hex-char:else:
    # otherwise return EAX - 'a' + 10
    2d/subtract-from-EAX  0x57/imm32/a-10
    c3/return

to-hex-char:  # in/EAX : nibble -> out/EAX : byte
    # no error checking; accepts argument in EAX
    # if (EAX <= 9) return EAX + '0'
    3d/compare-EAX-with  0x9/imm32/9
    7f/jump-if-greater  $to-hex-char:else/disp8
    05/add-to-EAX  0x30/imm32/0
    c3/return
$to-hex-char:else:
    # otherwise return EAX + 'a' - 10
    05/add-to-EAX  0x57/imm32/a-10
    c3/return

== data

_test-slice-empty:
  # nothing
_test-slice-empty-end:

_test-slice-hex-int:
  33/3 34/4
_test-slice-hex-int-end:

_test-slice-hex-int-letters-negative:
  2d/-
_test-slice-hex-int-letters:
  33/3 34/4 61/a
_test-slice-hex-int-letters-end:

_test-slice-hex-int-single-letter:
  61/a
_test-slice-hex-int-single-letter-end:

_test-slice-char-and-digits:
  71/q 33/3 34/4
_test-slice-char-and-digits-end:

_test-slice-digits-and-char:
  33/3 34/4 71/q
_test-slice-digits-and-char-end:

_test-slice-hex-int-with-0x-prefix-negative:
  2d/-
_test-slice-hex-int-with-0x-prefix:
  30/0 78/x 33/3 34/4
_test-slice-hex-int-with-0x-prefix-end:

_test-slice-hex-int-zero:
  30/0
_test-slice-hex-int-zero-end:

_test-slice-hex-int-with-0-prefix:
  30/0 33/3
_test-slice-hex-int-with-0-prefix-end:

_test-slice-hex-int-negative-with-0-prefix:
  2d/- 30/0 33/3
_test-slice-hex-int-negative-with-0-prefix-end:

# . . vim:nowrap:textwidth=0
	Commit message (Collapse)	Author	Age	Files	Lines
*	4211	Kartik K. Agaram	2018-02-20	2	-0/+3
\| \| \| \| \| \| \| \|	Just ran into first issue from using the portable /bin/sh rather than a modern shell: https://stackoverflow.com/questions/15744421/read-command-doesnt-wait-for-input Turn on errexit everywhere.
*	4198	Kartik K. Agaram	2018-01-25	1	-3/+3
\|
*	4054	Kartik K. Agaram	2017-10-12	1	-2/+6
\|
*	3729	Kartik K. Agaram	2017-01-03	9	-353/+29
\|
*	3728	Kartik K. Agaram	2016-12-31	1	-1/+1
\|
*	3726	Kartik K. Agaram	2016-12-30	1	-0/+1
\|
*	3721	Kartik K. Agaram	2016-12-27	1	-17/+17
\| \| \| \| \|	Switching my comment header for commented-out-code back after dropping Kakoune.
*	3719 - cross-link Mu waypoints to their location	Kartik K. Agaram	2016-12-27	1	-1/+16
\|
*	3718	Kartik K. Agaram	2016-12-27	1	-0/+2
\|
*	3717	Kartik K. Agaram	2016-12-26	1	-2/+0
\|
*	3715	Kartik K. Agaram	2016-12-26	1	-0/+3
\| \| \| \| \| \| \| \|	Fix cross-links in html for the edit/ app. I originally thought I'd need to provide a commandline flag like --rel-path or something. But we need to support different relative paths in a single html file. So the solution instead is appropriately engineering the tags file.
*	3713 - cross-link calls with definitions in html	Kartik K. Agaram	2016-12-26	9	-0/+543