Import libutf from http://git.suckless.org/libutf

libutf/utf.c

@@ -0,0 +1,129 @@
+/* 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;
+}