import vis and unvis

1 files changed, 178 insertions, 0 deletions

diff --git a/src/usr.bin/vis/vis.c b/src/usr.bin/vis/vis.c
new file mode 100644
index 0000000..0ccba27
--- /dev/null
+++ b/src/usr.bin/vis/vis.c
@@ -0,0 +1,178 @@
+/*	$OpenBSD: vis.c,v 1.15 2013/11/27 13:32:02 okan Exp $	*/
+/*	$NetBSD: vis.c,v 1.4 1994/12/20 16:13:03 jtc Exp $	*/
+
+/*-
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <err.h>
+#include <vis.h>
+
+int eflags, fold, foldwidth=80, none, markeol;
+
+#ifdef DEBUG
+int debug;
+#endif
+
+int foldit(char *, int, int);
+void process(FILE *);
+__dead void usage(void);
+
+int
+main(int argc, char *argv[])
+{
+	FILE *fp;
+	int ch;
+
+	while ((ch = getopt(argc, argv, "anwctsobfF:ld")) != -1)
+		switch(ch) {
+		case 'a':
+			eflags |= VIS_ALL;
+			break;
+		case 'n':
+			none++;
+			break;
+		case 'w':
+			eflags |= VIS_WHITE;
+			break;
+		case 'c':
+			eflags |= VIS_CSTYLE;
+			break;
+		case 't':
+			eflags |= VIS_TAB;
+			break;
+		case 's':
+			eflags |= VIS_SAFE;
+			break;
+		case 'o':
+			eflags |= VIS_OCTAL;
+			break;
+		case 'b':
+			eflags |= VIS_NOSLASH;
+			break;
+		case 'F':
+			if ((foldwidth = atoi(optarg))<5) {
+				errx(1, "can't fold lines to less than 5 cols");
+				/* NOTREACHED */
+			}
+			/*FALLTHROUGH*/
+		case 'f':
+			fold++;		/* fold output lines to 80 cols */
+			break;		/* using hidden newline */
+		case 'l':
+			markeol++;	/* mark end of line with \$ */
+			break;
+#ifdef DEBUG
+		case 'd':
+			debug++;
+			break;
+#endif
+		case '?':
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (*argv)
+		while (*argv) {
+			if ((fp=fopen(*argv, "r")) != NULL)
+				process(fp);
+			else
+				warn("%s", *argv);
+			argv++;
+		}
+	else
+		process(stdin);
+	exit(0);
+}
+	
+void
+process(FILE *fp)
+{
+	static int col = 0;
+	char *cp = "\0"+1;	/* so *(cp-1) starts out != '\n' */
+	int c, rachar; 
+	char buff[5];
+	
+	c = getc(fp);
+	while (c != EOF) {
+		rachar = getc(fp);
+		if (none) {
+			cp = buff;
+			*cp++ = c;
+			if (c == '\\')
+				*cp++ = '\\';
+			*cp = '\0';
+		} else if (markeol && c == '\n') {
+			cp = buff;
+			if ((eflags & VIS_NOSLASH) == 0)
+				*cp++ = '\\';
+			*cp++ = '$';
+			*cp++ = '\n';
+			*cp = '\0';
+		} else 
+			(void) vis(buff, (char)c, eflags, (char)rachar);
+
+		cp = buff;
+		if (fold) {
+#ifdef DEBUG
+			if (debug)
+				printf("<%02d,", col);
+#endif
+			col = foldit(cp, col, foldwidth);
+#ifdef DEBUG
+			if (debug)
+				printf("%02d>", col);
+#endif
+		}
+		do {
+			putchar(*cp);
+		} while (*++cp);
+		c = rachar;
+	}
+	/*
+	 * terminate partial line with a hidden newline
+	 */
+	if (fold && *(cp-1) != '\n')
+		printf("\\\n");
+}
+
+__dead void
+usage(void)
+{
+	extern char *__progname;
+
+	fprintf(stderr, "usage: %s [-abcflnostw] [-F foldwidth] [file ...]\n",
+	    __progname);
+	exit(1);
+}