initial import of NetBSD tree

1 files changed, 226 insertions, 0 deletions

diff --git a/usr.bin/fold/fold.c b/usr.bin/fold/fold.c
new file mode 100644
index 00000000000..1310c6e5133
--- /dev/null
+++ b/usr.bin/fold/fold.c
@@ -0,0 +1,226 @@
+/*	$NetBSD: fold.c,v 1.6 1995/09/01 01:42:44 jtc Exp $	*/
+
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kevin Ruddy.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1990, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)fold.c	8.1 (Berkeley) 6/6/93";
+#endif
+static char rcsid[] = "$NetBSD: fold.c,v 1.6 1995/09/01 01:42:44 jtc Exp $";
+#endif /* not lint */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <err.h>
+
+#define	DEFLINEWIDTH	80
+
+static void fold ();
+static int new_column_position ();
+int count_bytes = 0;
+int split_words = 0;
+
+int
+main(argc, argv)
+	int argc;
+	char **argv;
+{
+	register int ch;
+	int width;
+	char *p;
+
+	width = -1;
+	while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1)
+		switch (ch) {
+		case 'b':
+			count_bytes = 1;
+			break;
+		case 's':
+			split_words = 1;
+			break;
+		case 'w':
+			if ((width = atoi(optarg)) <= 0) {
+				(void)fprintf(stderr,
+				    "fold: illegal width value.\n");
+				exit(1);
+			}
+			break;
+		case '0': case '1': case '2': case '3': case '4':
+		case '5': case '6': case '7': case '8': case '9':
+			if (width == -1) {
+				p = argv[optind - 1];
+				if (p[0] == '-' && p[1] == ch && !p[2])
+					width = atoi(++p);
+				else
+					width = atoi(argv[optind] + 1);
+			}
+			break;
+		default:
+			(void)fprintf(stderr,
+			    "usage: fold [-bs] [-w width] [file ...]\n");
+			exit(1);
+		}
+	argv += optind;
+	argc -= optind;
+
+	if (width == -1)
+		width = DEFLINEWIDTH;
+
+	if (!*argv)
+		fold(width);
+	else for (; *argv; ++argv)
+		if (!freopen(*argv, "r", stdin)) {
+			err (1, "%s", *argv);
+			/* NOTREACHED */
+		} else
+			fold(width);
+	exit(0);
+}
+
+/*
+ * Fold the contents of standard input to fit within WIDTH columns
+ * (or bytes) and write to standard output.
+ *
+ * If split_words is set, split the line at the last space character
+ * on the line.  This flag necessitates storing the line in a buffer
+ * until the current column > width, or a newline or EOF is read.
+ *
+ * The buffer can grow larger than WIDTH due to backspaces and carriage
+ * returns embedded in the input stream.
+ */
+static void
+fold(width)
+	register int width;
+{
+	static char *buf = NULL;
+	static int   buf_max = 0;
+	register int ch, col;
+	register int indx;
+
+	col = indx = 0;
+	while ((ch = getchar()) != EOF) {
+		if (ch == '\n') {
+			if (indx != 0)
+				fwrite (buf, 1, indx, stdout);
+			putchar('\n');
+			col = indx = 0;
+			continue;
+		}
+
+		col = new_column_position (col, ch);
+		if (col > width) {
+			int i, last_space;
+
+			if (split_words) {
+				for (i = 0, last_space = -1; i < indx; i++)
+					if(buf[i] == ' ') last_space = i;
+			}
+
+			if (split_words && last_space != -1) {
+				last_space++;
+
+				fwrite (buf, 1, last_space, stdout);
+				memmove (buf, buf+last_space, indx-last_space);
+
+				indx -= last_space;
+				col = 0;
+				for (i = 0; i < indx; i++) {
+					col = new_column_position (col, ch);
+				}
+			} else {
+				fwrite (buf, 1, indx, stdout);
+				col = indx = 0;
+			}
+			putchar('\n');
+
+			/* calculate the column position for the next line. */
+			col = new_column_position (col, ch);
+		}
+
+		if (indx + 1 > buf_max) {
+			/* Allocate buffer in LINE_MAX increments */
+			buf_max += 2048;
+			if((buf = realloc (buf, buf_max)) == NULL) {
+				err (1, NULL);
+				/* NOTREACHED */
+			}
+		}
+		buf[indx++] = ch;
+	}
+
+	if (indx != 0)
+		fwrite (buf, 1, indx, stdout);
+}
+
+/*
+ * calculate the column position 
+ */
+static int
+new_column_position (col, ch)
+	int col;
+	int ch;
+{
+	if (!count_bytes) {
+		switch (ch) {
+		case '\b':
+			if (col > 0)
+				--col;
+			break;
+		case '\r':
+			col = 0;
+			break;
+		case '\t':
+			col = (col + 8) & ~7;
+			break;
+		default:
+			++col;
+			break;
+		}
+	} else {
+		++col;
+	}
+
+	return col;
+}