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) } }