New 9term using rio sources more directly.

src/cmd/9term/util.c

@@ -0,0 +1,149 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <thread.h>
+#include <cursor.h>
+#include <mouse.h>
+#include <keyboard.h>
+#include <frame.h>
+#include <fcall.h>
+#include "dat.h"
+#include "fns.h"
+
+void
+cvttorunes(char *p, int n, Rune *r, int *nb, int *nr, int *nulls)
+{
+	uchar *q;
+	Rune *s;
+	int j, w;
+
+	/*
+	 * Always guaranteed that n bytes may be interpreted
+	 * without worrying about partial runes.  This may mean
+	 * reading up to UTFmax-1 more bytes than n; the caller
+	 * knows this.  If n is a firm limit, the caller should
+	 * set p[n] = 0.
+	 */
+	q = (uchar*)p;
+	s = r;
+	for(j=0; j<n; j+=w){
+		if(*q < Runeself){
+			w = 1;
+			*s = *q++;
+		}else{
+			w = chartorune(s, (char*)q);
+			q += w;
+		}
+		if(*s)
+			s++;
+		else if(nulls)
+				*nulls = TRUE;
+	}
+	*nb = (char*)q-p;
+	*nr = s-r;
+}
+
+void
+error(char *s)
+{
+	fprint(2, "rio: %s: %r\n", s);
+	if(errorshouldabort)
+		abort();
+	threadexitsall("error");
+}
+
+void*
+erealloc(void *p, uint n)
+{
+	p = realloc(p, n);
+	if(p == nil)
+		error("realloc failed");
+	return p;
+}
+
+void*
+emalloc(uint n)
+{
+	void *p;
+
+	p = malloc(n);
+	if(p == nil)
+		error("malloc failed");
+	memset(p, 0, n);
+	return p;
+}
+
+char*
+estrdup(char *s)
+{
+	char *p;
+
+	p = malloc(strlen(s)+1);
+	if(p == nil)
+		error("strdup failed");
+	strcpy(p, s);
+	return p;
+}
+
+int
+isalnum(Rune c)
+{
+	/*
+	 * Hard to get absolutely right.  Use what we know about ASCII
+	 * and assume anything above the Latin control characters is
+	 * potentially an alphanumeric.
+	 */
+	if(c <= ' ')
+		return FALSE;
+	if(0x7F<=c && c<=0xA0)
+		return FALSE;
+	if(utfrune("!\"#$%&'()*+,-./:;<=>?@[\\]^`{|}~", c))
+		return FALSE;
+	return TRUE;
+}
+
+Rune*
+strrune(Rune *s, Rune c)
+{
+	Rune c1;
+
+	if(c == 0) {
+		while(*s++)
+			;
+		return s-1;
+	}
+
+	while(c1 = *s++)
+		if(c1 == c)
+			return s-1;
+	return nil;
+}
+
+int
+min(int a, int b)
+{
+	if(a < b)
+		return a;
+	return b;
+}
+
+int
+max(int a, int b)
+{
+	if(a > b)
+		return a;
+	return b;
+}
+
+char*
+runetobyte(Rune *r, int n, int *ip)
+{
+	char *s;
+	int m;
+
+	s = emalloc(n*UTFmax+1);
+	m = snprint(s, n*UTFmax+1, "%.*S", n, r);
+	*ip = m;
+	return s;
+}
+