+/*
+ * Copyright (c) 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Adam S. Moskowitz of Menlo Consulting and Marciano Pitargue.
+ *
+ * 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
+char copyright[] =
+"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)cut.c 5.4 (Berkeley) 10/30/90";
+#endif /* not lint */
+
+#include <limits.h>
+#include <stdio.h>
+#include <ctype.h>
+
+int cflag;
+char dchar;
+int dflag;
+int fflag;
+int sflag;
+
+main(argc, argv)
+ int argc;
+ char **argv;
+{
+ extern char *optarg;
+ extern int errno, optind;
+ FILE *fp;
+ int ch, (*fcn)(), c_cut(), f_cut();
+ char *strerror();
+
+ dchar = '\t'; /* default delimiter is \t */
+
+ while ((ch = getopt(argc, argv, "c:d:f:s")) != EOF)
+ switch(ch) {
+ case 'c':
+ fcn = c_cut;
+ get_list(optarg);
+ cflag = 1;
+ break;
+ case 'd':
+ dchar = *optarg;
+ dflag = 1;
+ break;
+ case 'f':
+ get_list(optarg);
+ fcn = f_cut;
+ fflag = 1;
+ break;
+ case 's':
+ sflag = 1;
+ break;
+ case '?':
+ default:
+ usage();
+ }
+ argc -= optind;
+ argv += optind;
+
+ if (fflag) {
+ if (cflag)
+ usage();
+ } else if (!cflag || dflag || sflag)
+ usage();
+
+ if (*argv)
+ for (; *argv; ++argv) {
+ if (!(fp = fopen(*argv, "r"))) {
+ (void)fprintf(stderr,
+ "cut: %s: %s\n", *argv, strerror(errno));
+ exit(1);
+ }
+ fcn(fp, *argv);
+ }
+ else
+ fcn(stdin, "stdin");
+ exit(0);
+}
+
+int autostart, autostop, maxval;
+
+char positions[_POSIX2_LINE_MAX + 1];
+
+get_list(list)
+ char *list;
+{
+ register char *pos;
+ register int setautostart, start, stop;
+ char *p, *strtok();
+
+ /*
+ * set a byte in the positions array to indicate if a field or
+ * column is to be selected; use +1, it's 1-based, not 0-based.
+ * This parser is less restrictive than the Draft 9 POSIX spec.
+ * POSIX doesn't allow lists that aren't in increasing order or
+ * overlapping lists. We also handle "-3-5" although there's no
+ * real reason too.
+ */
+ for (; p = strtok(list, ", \t"); list = NULL) {
+ setautostart = start = stop = 0;
+ if (*p == '-') {
+ ++p;
+ setautostart = 1;
+ }
+ if (isdigit(*p)) {
+ start = stop = strtol(p, &p, 10);
+ if (setautostart && start > autostart)
+ autostart = start;
+ }
+ if (*p == '-') {
+ if (isdigit(p[1]))
+ stop = strtol(p + 1, &p, 10);
+ if (*p == '-') {
+ ++p;
+ if (!autostop || autostop > stop)
+ autostop = stop;
+ }
+ }
+ if (*p)
+ badlist("illegal list value");
+ if (!stop || !start)
+ badlist("values may not include zero");
+ if (stop > _POSIX2_LINE_MAX) {
+ /* positions used rather than allocate a new buffer */
+ (void)sprintf(positions, "%d too large (max %d)",
+ stop, _POSIX2_LINE_MAX);
+ badlist(positions);
+ }
+ if (maxval < stop)
+ maxval = stop;
+ for (pos = positions + start; start++ <= stop; *pos++ = 1);
+ }
+
+ /* overlapping ranges */
+ if (autostop && maxval > autostop)
+ maxval = autostop;
+
+ /* set autostart */
+ if (autostart)
+ memset(positions + 1, '1', autostart);
+}
+
+/* ARGSUSED */
+c_cut(fp, fname)
+ FILE *fp;
+ char *fname;
+{
+ register int ch, col;
+ register char *pos;
+
+ for (;;) {
+ pos = positions + 1;
+ for (col = maxval; col; --col) {
+ if ((ch = getc(fp)) == EOF)
+ return;
+ if (ch == '\n')
+ break;
+ if (*pos++)
+ putchar(ch);
+ }
+ if (ch != '\n')
+ if (autostop)
+ while ((ch = getc(fp)) != EOF && ch != '\n')
+ putchar(ch);
+ else
+ while ((ch = getc(fp)) != EOF && ch != '\n');
+ putchar('\n');
+ }
+}
+
+f_cut(fp, fname)
+ FILE *fp;
+ char *fname;
+{
+ register int ch, field, isdelim;
+ register char *pos, *p, sep;
+ int output;
+ char lbuf[_POSIX2_LINE_MAX + 1];
+
+ for (sep = dchar, output = 0; fgets(lbuf, sizeof(lbuf), fp);) {
+ for (isdelim = 0, p = lbuf;; ++p) {
+ if (!(ch = *p)) {
+ (void)fprintf(stderr,
+ "cut: %s: line too long.\n", fname);
+ exit(1);
+ }
+ /* this should work if newline is delimiter */
+ if (ch == sep)
+ isdelim = 1;
+ if (ch == '\n') {
+ if (!isdelim && !sflag)
+ (void)printf("%s", lbuf);
+ break;
+ }
+ }
+ if (!isdelim)
+ continue;
+
+ pos = positions + 1;
+ for (field = maxval, p = lbuf; field; --field, ++pos) {
+ if (*pos) {
+ if (output++)
+ putchar(sep);
+ while ((ch = *p++) != '\n' && ch != sep)
+ putchar(ch);
+ } else
+ while ((ch = *p++) != '\n' && ch != sep);
+ if (ch == '\n')
+ break;
+ }
+ if (ch != '\n')
+ if (autostop) {
+ if (output)
+ putchar(sep);
+ for (; (ch = *p) != '\n'; ++p)
+ putchar(ch);
+ } else
+ for (; (ch = *p) != '\n'; ++p);
+ putchar('\n');
+ }
+}
+
+badlist(msg)
+ char *msg;
+{
+ (void)fprintf(stderr, "cut: [-cf] list: %s.\n", msg);
+ exit(1);
+}
+
+usage()
+{
+ (void)fprintf(stderr,
+"usage:\tcut -c list [file1 ...]\n\tcut -f list [-s] [-d delim] [file ...]\n");
+ exit(1);
+}
projects / unix-history / commitdiff