113 lines
1.7 KiB
V
113 lines
1.7 KiB
V
module builtin
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pub struct string {
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pub:
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str byteptr
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len int
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}
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pub fn strlen(s byteptr) int {
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mut i := 0
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for ; s[i] != 0; i++ {}
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return i
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}
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pub fn tos(s byteptr, len int) string {
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if s == 0 {
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panic('tos(): nil string')
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}
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return string {
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str: s
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len: len
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}
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}
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/*
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pub fn tos_clone(s byteptr) string {
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if s == 0 {
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panic('tos: nil string')
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}
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return tos2(s).clone()
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}
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*/
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// Same as `tos`, but calculates the length. Called by `string(bytes)` casts.
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// Used only internally.
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pub fn tos2(s byteptr) string {
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if s == 0 {
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panic('tos2: nil string')
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}
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return string {
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str: s
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len: strlen(s)
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}
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}
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pub fn tos3(s *C.char) string {
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if s == 0 {
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panic('tos3: nil string')
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}
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return string {
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str: byteptr(s)
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len: strlen(byteptr(s))
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}
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}
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pub fn string_eq (s1, s2 string) bool {
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if s1.len != s2.len { return false }
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for i in 0..s1.len {
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if s1[i] != s2[i] { return false }
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}
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return true
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}
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pub fn string_ne (s1, s2 string) bool {
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return !string_eq(s1,s2)
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}
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pub fn i64_tos(buf byteptr, len int, n0 i64, base int) string {
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if base < 2 { panic("base must be >= 2")}
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if base > 36 { panic("base must be <= 36")}
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mut b := tos(buf, len)
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mut i := len-1
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mut n := n0
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neg := n < 0
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if neg { n = -n }
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b[i--] = 0
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for {
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c := (n%base) + 48
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b[i--] = if c > 57 {c+7} else {c}
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if i < 0 { panic ("buffer to small") }
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n /= base
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if n < 1 {break}
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}
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if (neg) {
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if i < 0 { panic ("buffer to small") }
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b[i--] = 45
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}
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offset := i+1
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b.str = b.str + offset
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b.len -= (offset+1)
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return b
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}
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/*
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pub fn (a string) clone() string {
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mut b := string {
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len: a.len
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str: malloc(a.len + 1)
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}
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for i := 0; i < a.len; i++ {
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b[i] = a[i]
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}
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b[a.len] = `\0`
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return b
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}
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*/
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