new utilities.

the .C files compile but are renamed to avoid building automatically.

src/cmd/unicode.c

@@ -0,0 +1,122 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+
+char	usage[] = "unicode { [-t] hex hex ... | hexmin-hexmax ... | [-n] char ... }";
+char	hex[] = "0123456789abcdefABCDEF";
+int	numout = 0;
+int	text = 0;
+char	*err;
+Biobuf	bout;
+
+char	*range(char*[]);
+char	*nums(char*[]);
+char	*chars(char*[]);
+
+void
+main(int argc, char *argv[])
+{
+	ARGBEGIN{
+	case 'n':
+		numout = 1;
+		break;
+	case 't':
+		text = 1;
+		break;
+	}ARGEND
+	Binit(&bout, 1, OWRITE);
+	if(argc == 0){
+		fprint(2, "usage: %s\n", usage);
+		exits("usage");
+	}
+	if(!numout && utfrune(argv[0], '-'))
+		exits(range(argv));
+	if(numout || strchr(hex, argv[0][0])==0)
+		exits(nums(argv));
+	exits(chars(argv));
+}
+
+char*
+range(char *argv[])
+{
+	char *q;
+	int min, max;
+	int i;
+
+	while(*argv){
+		q = *argv;
+		if(strchr(hex, q[0]) == 0){
+    err:
+			fprint(2, "unicode: bad range %s\n", *argv);
+			return "bad range";
+		}
+		min = strtoul(q, &q, 16);
+		if(min<0 || min>0xFFFF || *q!='-')
+			goto err;
+		q++;
+		if(strchr(hex, *q) == 0)
+			goto err;
+		max = strtoul(q, &q, 16);
+		if(max<0 || max>0xFFFF || max<min || *q!=0)
+			goto err;
+		i = 0;
+		do{
+			Bprint(&bout, "%.4x %C", min, min);
+			i++;
+			if(min==max || (i&7)==0)
+				Bprint(&bout, "\n");
+			else
+				Bprint(&bout, "\t");
+			min++;
+		}while(min<=max);
+		argv++;
+	}
+	return 0;
+}
+
+char*
+nums(char *argv[])
+{
+	char *q;
+	Rune r;
+	int w;
+
+	while(*argv){
+		q = *argv;
+		while(*q){
+			w = chartorune(&r, q);
+			if(r==0x80 && (q[0]&0xFF)!=0x80){
+				fprint(2, "unicode: invalid utf string %s\n", *argv);
+				return "bad utf";
+			}
+			Bprint(&bout, "%.4x\n", r);
+			q += w;
+		}
+		argv++;
+	}
+	return 0;
+}
+
+char*
+chars(char *argv[])
+{
+	char *q;
+	int m;
+
+	while(*argv){
+		q = *argv;
+		if(strchr(hex, q[0]) == 0){
+    err:
+			fprint(2, "unicode: bad unicode value %s\n", *argv);
+			return "bad char";
+		}
+		m = strtoul(q, &q, 16);
+		if(m<0 || m>0xFFFF || *q!=0)
+			goto err;
+		Bprint(&bout, "%C", m);
+		if(!text)
+			Bprint(&bout, "\n");
+		argv++;
+	}
+	return 0;
+}