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