v/vlib/strings/strings.c.v

35 lines
824 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 := &byte(0)
unsafe { bytes = malloc(n + 1) }
C.memset( bytes, c, n )
bytes[n] = `0`
return string( bytes, 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 := &byte(0)
unsafe { bytes = malloc(blen + 1) }
for bi in 0..n {
bislen := bi*slen
for si in 0..slen {
bytes[bislen+si] = s[si]
}
}
bytes[blen] = `0`
return string( bytes, blen )
}