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Do not try to decode UTF-8 if it is too long to match the pattern.

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nicm
2026-09-28 16:55:08 +00:00
committed by tmux update bot
parent 389908d001
commit 95aaa6cc2a
1 changed files with 21 additions and 10 deletions
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31
fuzzy.c
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@@ -1,4 +1,4 @@
/* $OpenBSD: fuzzy.c,v 1.1 2026/06/26 14:40:30 nicm Exp $ */
/* $OpenBSD: fuzzy.c,v 1.2 2026/09/28 16:55:08 nicm Exp $ */
/*
* Copyright (c) 2026 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -245,16 +245,20 @@ fuzzy_column(const struct fuzzy_char *fc, const u_int *start, const u_int *src,
return (0);
}
/* Decode a UTF-8 term into an array of characters. */
static u_int
fuzzy_decode(const char *tok, size_t len, struct utf8_data *out)
/* Decode a UTF-8 term, stopping if it cannot fit in the given limit. */
static int
fuzzy_decode(const char *tok, size_t len, struct utf8_data *out, u_int limit,
u_int *n)
{
const char *cp = tok, *end = tok + len;
u_int n = 0;
while (cp != end)
cp = fuzzy_decode_one(cp, end, &out[n++]);
return (n);
*n = 0;
while (cp != end) {
if (*n == limit)
return (-1);
cp = fuzzy_decode_one(cp, end, &out[(*n)++]);
}
return (0);
}
/* Add the score for a fuzzy token matched at the given positions. */
@@ -474,7 +478,8 @@ fuzzy_match_term(const struct fuzzy_term *term, struct utf8_data *tok,
u_int toklen;
int value = 0, matched_term;
toklen = fuzzy_decode(term->text, term->len, tok);
if (fuzzy_decode(term->text, term->len, tok, ncs, &toklen) != 0)
return (term->inverse);
if (term->exact) {
matched_term = fuzzy_match_exact(tok, toklen, cs, ncs, fold,
term->prefix, term->suffix, &value,
@@ -539,6 +544,7 @@ fuzzy_match(const char *pattern, const char *text, u_int width, u_int *score)
u_int src[STYLE_ALIGN_ABSOLUTE_CENTRE + 1];
u_int vis[STYLE_ALIGN_ABSOLUTE_CENTRE + 1];
u_int wl, wc, wr, wa;
size_t toksize;
const char *cp, *sp;
int bestscore = 0, groupscore, found = 0, fold;
@@ -567,7 +573,12 @@ fuzzy_match(const char *pattern, const char *text, u_int width, u_int *score)
cs = fuzzy_scan(text, &ncs, widths);
matched = xcalloc(ncs == 0 ? 1 : ncs, sizeof *matched);
best = xcalloc(ncs == 0 ? 1 : ncs, sizeof *best);
tok = xreallocarray(NULL, strlen(pattern) + 1, sizeof *tok);
/* A term with more characters than the text cannot match. */
toksize = strlen(pattern);
if (toksize > ncs)
toksize = ncs;
tok = xreallocarray(NULL, toksize == 0 ? 1 : toksize, sizeof *tok);
/* Match each |-separated group and keep the best-scoring one. */
cp = pattern;