ubgpsuite/lonetix/utf/utfutf.c

49 lines
1.5 KiB
C
Executable File

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