mirror of https://gitea.it/1414codeforge/ubgpsuite
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
3 years ago
|
// SPDX-License-Identifier: LGPL-3.0-or-later
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \file utf/utfrune.c
|
||
|
|
*
|
||
|
|
* Implements `utfrune()`.
|
||
|
|
*
|
||
|
|
* \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 *utfrune(const char *s, Rune c)
|
||
|
|
{
|
||
|
|
if (c < RUNE_SYNC) // not part of utf sequence
|
||
|
|
return strchr(s, c);
|
||
|
|
|
||
|
|
while (TRUE) {
|
||
|
|
Rune uc = *(const Uint8 *) s;
|
||
|
|
if (uc < RUNE_SELF) { // one byte
|
||
|
|
if (uc == '\0')
|
||
|
|
break;
|
||
|
|
|
||
|
|
// Following if is for reference only, optimized away, see topmost `if`
|
||
|
|
if (RUNE_SYNC != RUNE_SELF && uc == c)
|
||
|
|
return (char *) s;
|
||
|
|
|
||
|
|
s++;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
Rune r;
|
||
|
|
size_t n = chartorune(&r, s);
|
||
|
|
if (r == c)
|
||
|
|
return (char *) s;
|
||
|
|
|
||
|
|
s += n;
|
||
|
|
}
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|