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19 lines
508 B
Go
19 lines
508 B
Go
package web
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import "unicode/utf8"
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// Clip trims a string to at most n bytes, backing off to a valid UTF-8 boundary
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// if the cut landed mid-rune. Use it to bound stored/searched text from form
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// input: a plain s[:n] can split a multi-byte rune, producing invalid UTF-8 that
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// Postgres rejects (surfacing to the user as an unexplained save failure).
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func Clip(s string, n int) string {
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if len(s) <= n {
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return s
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}
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s = s[:n]
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for len(s) > 0 && !utf8.ValidString(s) {
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s = s[:len(s)-1]
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}
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return s
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}
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