new utilities.

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

src/cmd/strings.c

@@ -0,0 +1,88 @@
+#include	<u.h>
+#include 	<libc.h>
+#include	<bio.h>
+
+Biobuf	*fin;
+Biobuf	fout;
+
+#define	MINSPAN		6		/* Min characters in string */
+
+#define BUFSIZE		70
+
+void stringit(char *);
+int isprint(Rune);
+
+void
+main(int argc, char **argv)
+{
+	int i;
+
+	Binit(&fout, 1, OWRITE);
+	if(argc < 2) {
+		stringit("/fd/0");
+		exits(0);
+	}
+
+	for(i = 1; i < argc; i++) {
+		if(argc > 2)
+			print("%s:\n", argv[i]);
+
+		stringit(argv[i]);
+	}
+
+	exits(0);
+}
+
+void
+stringit(char *str)
+{
+	long posn, start;
+	int cnt = 0;
+	long c;
+
+	Rune buf[BUFSIZE];
+
+	if ((fin = Bopen(str, OREAD)) == 0) {
+		perror("open");
+		return;
+	}
+
+	start = 0;
+	posn = Boffset(fin);
+	while((c = Bgetrune(fin)) >= 0) {
+		if(isprint(c)) {
+			if(start == 0)
+				start = posn;
+			buf[cnt++] = c;
+			if(cnt == BUFSIZE-1) {
+				buf[cnt] = 0;
+				Bprint(&fout, "%8ld: %S ...\n", start, buf);
+				start = 0;
+				cnt = 0;
+			}
+		} else {
+			 if(cnt >= MINSPAN) {
+				buf[cnt] = 0;
+				Bprint(&fout, "%8ld: %S\n", start, buf);
+			}
+			start = 0;
+			cnt = 0;
+		}	
+		posn = Boffset(fin);
+	}
+
+	if(cnt >= MINSPAN){
+		buf[cnt] = 0;
+		Bprint(&fout, "%8ld: %S\n", start, buf);
+	}
+	Bterm(fin);
+}
+
+int
+isprint(Rune r)
+{
+	if ((r >= ' ' && r <0x7f) || r > 0xA0)
+		return 1;
+	else
+		return 0;
+}