untested string.contains(haystack, needle)
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@ -82,3 +82,40 @@ equals := fn(lhs: ^u8, rhs: ^u8): bool {
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i += 1
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}
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}
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contains := fn(haystack: ^u8, needle: ^u8): bool {
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haystack_len := @inline(length, haystack)
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needle_len := @inline(length, needle)
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if needle_len == 0 {
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return true
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}
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if haystack_len < needle_len {
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return false
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}
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max_start := haystack_len - needle_len
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pos := 0
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loop if pos > max_start break else {
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is_match := true
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offset := 0
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loop if offset >= needle_len break else {
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if *(haystack + pos + offset) != *(needle + offset) {
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is_match = false
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}
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if is_match == false {
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break
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}
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offset += 1
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}
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if is_match {
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return true
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}
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pos += 1
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}
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return false
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}
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