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package strconv
Int_Flag :: enum {
Prefix,
Plus,
}
Int_Flags :: bit_set[Int_Flag]
MAX_BASE :: 32
digits := "0123456789abcdefghijklmnopqrstuvwxyz"
/*
Determines whether the given unsigned 64-bit integer is a negative value by interpreting it as a signed integer with the specified bit size.
**Inputs**
- x: The unsigned 64-bit integer to check for negativity
- is_signed: A boolean indicating if the input should be treated as a signed integer
- bit_size: The bit size of the signed integer representation (8, 16, 32, or 64)
**Returns**
- u: The absolute value of the input integer
- neg: A boolean indicating whether the input integer is negative
*/
is_integer_negative :: proc(x: u64, is_signed: bool, bit_size: int) -> (u: u64, neg: bool) {
u = x
if is_signed {
switch bit_size {
case 8:
i := i8(u)
neg = i < 0
u = u64(abs(i64(i)))
case 16:
i := i16(u)
neg = i < 0
u = u64(abs(i64(i)))
case 32:
i := i32(u)
neg = i < 0
u = u64(abs(i64(i)))
case 64:
i := i64(u)
neg = i < 0
u = u64(abs(i))
case:
panic("is_integer_negative: Unknown integer size")
}
}
return
}
/*
Appends the string representation of an integer to a buffer with specified base, flags, and digit set.
**Inputs**
- buf: The buffer to append the integer representation to
- x: The integer value to convert
- base: The base for the integer representation (2 <= base <= MAX_BASE)
- is_signed: A boolean indicating if the input should be treated as a signed integer
- bit_size: The bit size of the signed integer representation (8, 16, 32, or 64)
- digits: The digit set used for the integer representation
- flags: The Int_Flags bit set to control integer formatting
**Returns**
- The string containing the integer representation appended to the buffer
*/
append_bits :: proc(buf: []byte, x: u64, base: int, is_signed: bool, bit_size: int, digits: string, flags: Int_Flags) -> string {
if base < 2 || base > MAX_BASE {
panic("strconv: illegal base passed to append_bits")
}
a: [129]byte
i := len(a)
u, neg := is_integer_negative(x, is_signed, bit_size)
b := u64(base)
for u >= b {
i-=1; a[i] = digits[u % b]
u /= b
}
i-=1; a[i] = digits[u % b]
if .Prefix in flags {
ok := true
switch base {
case 2: i-=1; a[i] = 'b'
case 8: i-=1; a[i] = 'o'
// case 10: i-=1; a[i] = 'd';
case 12: i-=1; a[i] = 'z'
case 16: i-=1; a[i] = 'x'
case: ok = false
}
if ok {
i-=1; a[i] = '0'
}
}
switch {
case neg:
i-=1; a[i] = '-'
case .Plus in flags:
i-=1; a[i] = '+'
}
out := a[i:]
copy(buf, out)
return string(buf[0:len(out)])
}
/*
Determines whether the given unsigned 128-bit integer is a negative value by interpreting it as a signed integer with the specified bit size.
**Inputs**
- x: The unsigned 128-bit integer to check for negativity
- is_signed: A boolean indicating if the input should be treated as a signed integer
- bit_size: The bit size of the signed integer representation (8, 16, 32, 64, or 128)
**Returns**
- u: The absolute value of the input integer
- neg: A boolean indicating whether the input integer is negative
*/
is_integer_negative_128 :: proc(x: u128, is_signed: bool, bit_size: int) -> (u: u128, neg: bool) {
u = x
if is_signed {
switch bit_size {
case 8:
i := i8(u)
neg = i < 0
u = u128(abs(i128(i)))
case 16:
i := i16(u)
neg = i < 0
u = u128(abs(i128(i)))
case 32:
i := i32(u)
neg = i < 0
u = u128(abs(i128(i)))
case 64:
i := i64(u)
neg = i < 0
u = u128(abs(i128(i)))
case 128:
i := i128(u)
neg = i < 0
u = u128(abs(i))
case:
panic("is_integer_negative: Unknown integer size")
}
}
return
}
/*
Appends the string representation of a 128-bit integer to a buffer with specified base, flags, and digit set.
**Inputs**
- buf: The buffer to append the integer representation to
- x: The 128-bit integer value to convert
- base: The base for the integer representation (2 <= base <= MAX_BASE)
- is_signed: A boolean indicating if the input should be treated as a signed integer
- bit_size: The bit size of the signed integer representation (8, 16, 32, 64, or 128)
- digits: The digit set used for the integer representation
- flags: The Int_Flags bit set to control integer formatting
**Returns**
- The string containing the integer representation appended to the buffer
*/
append_bits_128 :: proc(buf: []byte, x: u128, base: int, is_signed: bool, bit_size: int, digits: string, flags: Int_Flags) -> string {
if base < 2 || base > MAX_BASE {
panic("strconv: illegal base passed to append_bits")
}
a: [140]byte
i := len(a)
u, neg := is_integer_negative_128(x, is_signed, bit_size)
b := u128(base)
for u >= b && i >= 0 {
i-=1
// rem: u128;
// u = runtime.udivmod128(u, b, &rem);
// u /= b;
rem := u % b
u /= b
idx := u32(rem)
a[i] = digits[idx]
}
i-=1; a[i] = digits[u64(u % b)]
if .Prefix in flags {
ok := true
switch base {
case 2: i-=1; a[i] = 'b'
case 8: i-=1; a[i] = 'o'
case 10: i-=1; a[i] = 'd'
case 12: i-=1; a[i] = 'z'
case 16: i-=1; a[i] = 'x'
case: ok = false
}
if ok {
i-=1; a[i] = '0'
}
}
switch {
case neg:
i-=1; a[i] = '-'
case .Plus in flags:
i-=1; a[i] = '+'
}
out := a[i:]
copy(buf, out)
return string(buf[0:len(out)])
}
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