49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
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// SPDX-License-Identifier: LGPL-3.0-or-later
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/**
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* \file utf/utfutf.c
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*
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* Implements `utfutf()`.
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*
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* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
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* \author Lorenzo Cogotti
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*/
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/*
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* This work is derived from Plan 9 libutf, see utf/utf.h for details.
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* Original license terms follow:
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*
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* The authors of this software are Rob Pike and Ken Thompson.
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* Copyright (c) 2002 by Lucent Technologies.
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* Permission to use, copy, modify, and distribute this software for any
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* purpose without fee is hereby granted, provided that this entire notice
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* is included in all copies of any software which is or includes a copy
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* or modification of this software and in all copies of the supporting
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* documentation for such software.
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE
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* ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
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* OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
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*
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* The original libutf library is available at: https://9fans.github.io/plan9port/unix/libutf.tgz
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*/
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#include "utf/utf.h"
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#include <string.h>
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char *utfutf(const char *s1, const char *s2)
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{
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Rune f;
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size_t n1 = chartorune(&f, s2);
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if (f <= RUNE_SYNC) // represents self
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return strstr(s1, s2);
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size_t n2 = strlen(s2);
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for (char *p = (char *) s1; (p = utfrune(p, f)) != NULL; p += n1) {
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if (strncmp(p, s2, n2) == 0)
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return p;
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}
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return NULL;
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}
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