sbase/libutf/utf.c

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/* MIT/X Consortium Copyright (c) 2012 Connor Lane Smith <cls@lubutu.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <string.h>
#include "../utf.h"
char *
utfecpy(char *to, char *end, const char *from)
{
Rune r = Runeerror;
size_t i, n;
/* seek through to find final full rune */
for(i = 0; r != '\0' && (n = charntorune(&r, &from[i], end - &to[i])); i += n)
;
memcpy(to, from, i); /* copy over bytes up to this rune */
if(i > 0 && r != '\0')
to[i] = '\0'; /* terminate if unterminated */
return &to[i];
}
size_t
utflen(const char *s)
{
const char *p = s;
size_t i;
Rune r;
for(i = 0; *p != '\0'; i++)
p += chartorune(&r, p);
return i;
}
size_t
utfnlen(const char *s, size_t len)
{
const char *p = s;
size_t i;
Rune r;
int n;
for(i = 0; (n = charntorune(&r, p, len-(p-s))) && r != '\0'; i++)
p += n;
return i;
}
char *
utfrune(const char *s, Rune r)
{
if(r < Runeself) {
return strchr(s, r);
}
else if(r == Runeerror) {
Rune r0;
int n;
for(; *s != '\0'; s += n) {
n = chartorune(&r0, s);
if(r == r0)
return (char *)s;
}
}
else {
char buf[UTFmax+1];
int n;
if(!(n = runetochar(buf, &r)))
return NULL;
buf[n] = '\0';
return strstr(s, buf);
}
return NULL;
}
char *
utfrrune(const char *s, Rune r)
{
const char *p = NULL;
Rune r0;
int n;
if(r < Runeself)
return strrchr(s, r);
for(; *s != '\0'; s += n) {
n = chartorune(&r0, s);
if(r == r0)
p = s;
}
return (char *)p;
}
char *
utfutf(const char *s, const char *t)
{
const char *p, *q;
Rune r0, r1, r2;
int n, m;
for(chartorune(&r0, t); (s = utfrune(s, r0)); s++) {
for(p = s, q = t; *q && *p; p += n, q += m) {
n = chartorune(&r1, p);
m = chartorune(&r2, q);
if(r1 != r2)
break;
}
if(!*q)
return (char *)s;
}
return NULL;
}