new utilities.

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

src/cmd/freq.c

@@ -0,0 +1,111 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+
+long	count[1<<16];
+Biobuf	bout;
+
+void	freq(int, char*);
+long	flag;
+enum
+{
+	Fdec	= 1<<0,
+	Fhex	= 1<<1,
+	Foct	= 1<<2,
+	Fchar	= 1<<3,
+	Frune	= 1<<4,
+};
+
+void
+main(int argc, char *argv[])
+{
+	int f, i;
+
+	flag = 0;
+	Binit(&bout, 1, OWRITE);
+	ARGBEGIN{
+	default:
+		fprint(2, "freq: unknown option %c\n", ARGC());
+		exits("usage");
+	case 'd':
+		flag |= Fdec;
+		break;
+	case 'x':
+		flag |= Fhex;
+		break;
+	case 'o':
+		flag |= Foct;
+		break;
+	case 'c':
+		flag |= Fchar;
+		break;
+	case 'r':
+		flag |= Frune;
+		break;
+	}ARGEND
+	if((flag&(Fdec|Fhex|Foct|Fchar)) == 0)
+		flag |= Fdec | Fhex | Foct | Fchar;
+	if(argc < 1) {
+		freq(0, "-");
+		exits(0);
+	}
+	for(i=0; i<argc; i++) {
+		f = open(argv[i], 0);
+		if(f < 0) {
+			fprint(2, "cannot open %s\n", argv[i]);
+			continue;
+		}
+		freq(f, argv[i]);
+		close(f);
+	}
+	exits(0);
+}
+
+void
+freq(int f, char *s)
+{
+	Biobuf bin;
+	long c, i;
+
+	memset(count, 0, sizeof(count));
+	Binit(&bin, f, OREAD);
+	if(flag & Frune) {
+		for(;;) {
+			c = Bgetrune(&bin);
+			if(c < 0)
+				break;
+			count[c]++;
+		}
+	} else {
+		for(;;) {
+			c = Bgetc(&bin);
+			if(c < 0)
+				break;
+			count[c]++;
+		}
+	}
+	Bterm(&bin);
+	if(c != Beof)
+		fprint(2, "freq: read error on %s\n", s);
+
+	for(i=0; i<nelem(count); i++) {
+		if(count[i] == 0)
+			continue;
+		if(flag & Fdec)
+			Bprint(&bout, "%3ld ", i);
+		if(flag & Foct)
+			Bprint(&bout, "%.3lo ", i);
+		if(flag & Fhex)
+			Bprint(&bout, "%.2lx ", i);
+		if(flag & Fchar) {
+			if(i <= 0x20 ||
+			   i >= 0x7f && i < 0xa0 ||
+			   i > 0xff && !(flag & Frune))
+				Bprint(&bout, "- ");
+			else
+				Bprint(&bout, "%C ", (int)i);
+		}
+		Bprint(&bout, "%8ld\n", count[i]);
+	}
+	Bflush(&bout);
+}