prog8/compiler/res/prog8lib/virtual/conv.p8

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; Number conversions routines.
conv {
; ----- number conversions to decimal strings ----
str string_out = "????????????????" ; result buffer for the string conversion routines
sub str_ub0(ubyte value) {
; ---- convert the ubyte in A in decimal string form, with left padding 0s (3 positions total)
ubyte hundreds = value / 100
value -= hundreds*100
ubyte tens = value / 10
value -= tens*10
string_out[0] = hundreds+'0'
string_out[1] = tens+'0'
string_out[2] = value+'0'
string_out[3] = 0
}
sub str_ub(ubyte value) {
; ---- convert the ubyte in A in decimal string form, without left padding 0s
internal_str_ub(value, string_out)
}
sub str_b(byte value) {
; ---- convert the byte in A in decimal string form, without left padding 0s
uword out_ptr = &string_out
if value<0 {
@(out_ptr) = '-'
out_ptr++
value = -value
}
internal_str_ub(value as ubyte, out_ptr)
}
sub internal_str_ub(ubyte value, uword out_ptr) {
ubyte hundreds = value / 100
value -= hundreds*100
ubyte tens = value / 10
value -= tens*10
if hundreds
goto output_hundreds
if tens
goto output_tens
goto output_ones
output_hundreds:
@(out_ptr) = hundreds+'0'
out_ptr++
output_tens:
@(out_ptr) = tens+'0'
out_ptr++
output_ones:
@(out_ptr) = value+'0'
out_ptr++
@(out_ptr) = 0
}
str hex_digits = "0123456789abcdef"
sub str_ubhex (ubyte value) {
; ---- convert the ubyte in A in hex string form
string_out[0] = hex_digits[value>>4]
string_out[1] = hex_digits[value&15]
string_out[2] = 0
}
sub str_ubbin (ubyte value) {
; ---- convert the ubyte in A in binary string form
uword out_ptr = &string_out
repeat 8 {
rol(value)
if_cc
@(out_ptr) = '0'
else
@(out_ptr) = '1'
out_ptr++
}
@(out_ptr) = 0
}
sub str_uwbin (uword value) {
; ---- convert the uword in A/Y in binary string form
uword out_ptr = &string_out
repeat 16 {
rol(value)
if_cc
@(out_ptr) = '0'
else
@(out_ptr) = '1'
out_ptr++
}
@(out_ptr) = 0
}
sub str_uwhex (uword value) {
; ---- convert the uword in A/Y in hexadecimal string form (4 digits)
ubyte bits = msb(value)
string_out[0] = hex_digits[bits>>4]
string_out[1] = hex_digits[bits&15]
bits = lsb(value)
string_out[2] = hex_digits[bits>>4]
string_out[3] = hex_digits[bits&15]
string_out[4] = 0
}
sub str_uw0 (uword value) {
; ---- convert the uword in A/Y in decimal string form, with left padding 0s (5 positions total)
ubyte tenthousands = (value / 10000) as ubyte
value -= 10000*tenthousands
ubyte thousands = (value / 1000) as ubyte
value -= 1000*thousands
ubyte hundreds = (value / 100) as ubyte
value -= 100 as uword * hundreds
ubyte tens = (value / 10) as ubyte
value -= 10*tens
string_out[0] = tenthousands+'0'
string_out[1] = thousands+'0'
string_out[2] = hundreds+'0'
string_out[3] = tens+'0'
string_out[4] = value as ubyte + '0'
string_out[5] = 0
}
sub str_uw (uword value) {
; ---- convert the uword in A/Y in decimal string form, without left padding 0s
internal_str_uw(value, string_out)
}
sub str_w (word value) {
; ---- convert the (signed) word in A/Y in decimal string form, without left padding 0's
uword out_ptr = &string_out
if value<0 {
@(out_ptr) = '-'
out_ptr++
value = -value
}
internal_str_uw(value as uword, out_ptr)
}
sub internal_str_uw(uword value, uword out_ptr) {
ubyte tenthousands = (value / 10000) as ubyte
value -= 10000*tenthousands
ubyte thousands = (value / 1000) as ubyte
value -= 1000*thousands
ubyte hundreds = (value / 100) as ubyte
value -= 100 as uword * hundreds
ubyte tens = (value / 10) as ubyte
value -= 10*tens
if tenthousands
goto output_tenthousands
if thousands
goto output_thousands
if hundreds
goto output_hundreds
if tens
goto output_tens
goto output_ones
output_tenthousands:
@(out_ptr) = tenthousands+'0'
out_ptr++
output_thousands:
@(out_ptr) = thousands+'0'
out_ptr++
output_hundreds:
@(out_ptr) = hundreds+'0'
out_ptr++
output_tens:
@(out_ptr) = tens+'0'
out_ptr++
output_ones:
@(out_ptr) = value as ubyte + '0'
out_ptr++
@(out_ptr) = 0
}
; ---- string conversion to numbers -----
sub str2ubyte(str string) -> ubyte {
; -- returns in A the unsigned byte value of the string number argument in AY
; the number may NOT be preceded by a + sign and may NOT contain spaces
; (any non-digit character will terminate the number string that is parsed)
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return str2uword(string) as ubyte
}
sub str2byte(str string) -> byte {
; -- returns in A the signed byte value of the string number argument in AY
; the number may be preceded by a + or - sign but may NOT contain spaces
; (any non-digit character will terminate the number string that is parsed)
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return str2word(string) as byte
}
sub str2uword(str string) -> uword {
; -- returns the unsigned word value of the string number argument in AY
; the number may NOT be preceded by a + sign and may NOT contain spaces
; (any non-digit character will terminate the number string that is parsed)
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%asm {{
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loadm.w r0,conv.str2uword.string
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syscall 11
return
}}
}
sub str2word(str string) -> word {
; -- returns the signed word value of the string number argument in AY
; the number may be preceded by a + or - sign but may NOT contain spaces
; (any non-digit character will terminate the number string that is parsed)
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%asm {{
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loadm.w r0,conv.str2word.string
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syscall 12
return
}}
}
sub hex2uword(str string) -> uword {
; -- hexadecimal string (with or without '$') to uword.
; stops parsing at the first character that's not a hex digit (except leading $)
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uword result
ubyte char
if @(string)=='$'
string++
repeat {
char = @(string)
if char==0
return result
result <<= 4
if char>='0' and char<='9'
result |= char-'0'
else
result |= char-'a'+10
string++
}
}
sub bin2uword(str string) -> uword {
; -- binary string (with or without '%') to uword.
; stops parsing at the first character that's not a 0 or 1. (except leading %)
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uword result
ubyte char
if @(string)=='%'
string++
repeat {
char = @(string)
if char==0
return result
result <<= 1
if char=='1'
result |= 1
string++
}
}
sub any2uword(str string) -> uword {
; -- convert any number string (any prefix allowed) to uword.
when string[0] {
'$' -> return hex2uword(string)
'%' -> return bin2uword(string)
else -> return str2uword(string)
}
}
}