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v/vlib/builtin/int.v

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// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
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module builtin
/*
// old function for reference
pub fn (nn int) str1() string {
mut n := nn
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if n == 0 {
return '0'
}
max := 16
mut buf := vcalloc(max + 1)
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mut len := 0
mut is_neg := false
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if n < 0 {
n = -n
is_neg = true
}
// Fill the string from the end
for n > 0 {
d := n % 10
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buf[max - len - 1] = d + int(`0`)
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len++
n = n / 10
}
// Prepend - if it's negative
if is_neg {
buf[max - len - 1] = `-`
len++
}
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buf[max] = `\0`
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return tos(buf + max - len, len)
}
*/
// ----- value to string functions -----
/*
// old function for reference
pub fn ptr_str(ptr voidptr) string {
buf := malloc(sizeof(double) * 5 + 1) // TODO
C.sprintf((buf), '%p', ptr)
return tos(buf, vstrlen(buf))
}
*/
pub fn ptr_str(ptr voidptr) string {
buf1 := u64(ptr).hex()
return buf1
}
const(
digit_pairs = "00102030405060708090011121314151617181910212223242526272829203132333435363738393041424344454647484940515253545556575859506162636465666768696071727374757677787970818283848586878889809192939495969798999"
)
// This implementation is the quickest with gcc -O2
[inline]
pub fn (nn int) str_l(max int) string {
mut n := nn
mut d := 0
if n == 0 {
return '0'
}
mut buf := malloc(max + 1)
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mut is_neg := false
if n < 0 {
n = -n
is_neg = true
}
mut index := max
buf[index--] = `\0`
for n > 0 {
n1 := n / 100
d = ((n - (n1 * 100)) << 1)
n = n1
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buf[index--] = digit_pairs.str[d++]
buf[index--] = digit_pairs.str[d]
}
index++
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// remove head zero
if d < 20 {
index++
}
// Prepend - if it's negative
if is_neg {
index--
buf[index] = `-`
}
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C.memmove(buf,buf+index, (max-index)+1 )
return tos(buf, (max-index))
//return tos(buf + index, (max-index))
}
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pub fn (n i8) str() string {
return int(n).str_l(5)
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}
pub fn (n i16) str() string {
return int(n).str_l(7)
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}
pub fn (n u16) str() string {
return int(n).str_l(7)
}
pub fn (n int) str() string {
return n.str_l(12)
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}
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pub fn (nn u32) str() string {
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mut n := nn
mut d := u32(0)
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if n == 0 {
return '0'
}
max := 12
mut buf := malloc(max + 1)
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mut index := max
buf[index--] = `\0`
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for n > 0 {
n1 := n / u32(100)
d = ((n - (n1 * u32(100))) << u32(1))
n = n1
buf[index--] = digit_pairs[d++]
buf[index--] = digit_pairs[d]
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}
index++
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// remove head zero
if d < u32(20) {
index++
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}
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C.memmove(buf,buf+index, (max-index)+1 )
return tos(buf, (max-index))
//return tos(buf + index, (max-index))
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}
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pub fn (nn i64) str() string {
mut n := nn
mut d := i64(0)
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if n == 0 {
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return '0'
}
max := 20
mut buf := vcalloc(max + 1)
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mut is_neg := false
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if n < 0 {
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n = -n
is_neg = true
}
mut index := max
buf[index--] = `\0`
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for n > 0 {
n1 := n / i64(100)
d = ((n - (n1 * i64(100))) << i64(1))
n = n1
buf[index--] = digit_pairs[d++]
buf[index--] = digit_pairs[d]
}
index++
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// remove head zero
if d < i64(20) {
index++
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}
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// Prepend - if it's negative
if is_neg {
index--
buf[index] = `-`
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}
C.memmove(buf,buf+index, (max-index)+1 )
return tos(buf, (max-index))
//return tos(buf + index, (max-index))
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}
pub fn (nn u64) str() string {
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mut n := nn
mut d := 0
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if n == 0 {
return '0'
}
max := 20
mut buf := vcalloc(max + 1)
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mut index := max
buf[index--] = `\0`
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for n > 0 {
n1 := n / 100
d = ((n - (n1 * 100)) << 1)
n = n1
buf[index--] = digit_pairs[d++]
buf[index--] = digit_pairs[d]
}
index++
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// remove head zero
if d < 20 {
index++
}
C.memmove(buf,buf+index, (max-index)+1 )
return tos(buf, (max-index))
//return tos(buf + index, (max-index))
}
pub fn (b bool) str() string {
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if b {
return 'true'
}
return 'false'
}
// ----- value to hex string functions -----
/*
//old function for reference
pub fn (n int) hex1() string {
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len := if n >= 0 { n.str().len + 3 } else { 11 }
hex := malloc(len) // 0x + \n
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count := C.sprintf((hex), '0x%x', n)
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return tos(hex, count)
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}
*/
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pub fn (nn int) hex() string {
mut n := u32(nn)
max := 10
mut buf := malloc(max + 1)
mut index := max
buf[index--] = `\0`
for n > 0 {
d := n & 0xF
n = n >> 4
buf[index--] = if d < 10 { d + `0` } else { d + 87 }
}
//buf[index--] = `x`
//buf[index] = `0`
index++
return tos(buf + index, (max - index))
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}
pub fn (nn u64) hex() string {
mut n := nn
max := 18
mut buf := malloc(max + 1)
mut index := max
buf[index--] = `\0`
for n > 0 {
d := n & 0xF
n = n >> 4
buf[index--] = if d < 10 { d + `0` } else { d + 87 }
}
//buf[index--] = `x`
//buf[index] = `0`
index++
C.memmove(buf,buf+index, (max-index)+1 )
return tos(buf, (max-index))
//return tos(buf + index, (max-index))
}
pub fn (nn i64) hex() string {
mut n := u64(nn)
return n.hex()
}
// ----- utilities functions -----
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pub fn (a []byte) contains(val byte) bool {
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for aa in a {
if aa == val {
return true
}
}
return false
}
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pub fn (c rune) str() string {
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fst_byte := int(c)>>8 * 3 & 0xff
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len := utf8_char_len(fst_byte)
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mut str := string{
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len: len
str: malloc(len + 1)
}
for i in 0..len {
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str.str[i] = int(c)>>8 * (3 - i) & 0xff
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}
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str.str[len] = `\0`
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return str
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}
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pub fn (c byte) str() string {
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mut str := string{
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len: 1
str: malloc(2)
}
str.str[0] = c
str.str[1] = `\0`
return str
}
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pub fn (c byte) is_capital() bool {
return c >= `A` && c <= `Z`
}
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pub fn (b []byte) clone() []byte {
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mut res := [byte(0)].repeat(b.len)
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//mut res := make([]byte, {repeat:b.len})
for i in 0..b.len {
res[i] = b[i]
}
return res
}
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