v/vlib/strings/strings.c.v

39 lines
871 B
V

module strings
// strings.repeat - fill a string with `n` repetitions of the character `c`
pub fn repeat(c byte, n int) string {
if n <= 0 {
return ''
}
mut bytes := unsafe {malloc(n + 1)}
unsafe {
C.memset(bytes, c, n)
bytes[n] = `0`
}
return unsafe {bytes.vstring_with_len(n)}
}
// strings.repeat_string - gives you `n` repetitions of the substring `s`
// NB: strings.repeat, that repeats a single byte, is between 2x
// and 24x faster than strings.repeat_string called for a 1 char string.
pub fn repeat_string(s string, n int) string {
if n <= 0 || s.len == 0 {
return ''
}
slen := s.len
blen := slen * n
mut bytes := unsafe {malloc(blen + 1)}
for bi in 0 .. n {
bislen := bi * slen
for si in 0 .. slen {
unsafe {
bytes[bislen + si] = s[si]
}
}
}
unsafe {
bytes[blen] = `0`
}
return unsafe {bytes.vstring_with_len(blen)}
}