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-rw-r--r--examples/loadables/cut.c379
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diff --git a/examples/loadables/cut.c b/examples/loadables/cut.c
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+/*
+ * Copyright (c) 1989, 1993
+ * 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
+static const char copyright[] =
+"@(#) Copyright (c) 1989, 1993\n\
+ The Regents of the University of California. All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static const char sccsid[] = "@(#)cut.c 8.3 (Berkeley) 5/4/95";
+#endif /* not lint */
+
+#include <config.h>
+
+#include <ctype.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "bashansi.h"
+
+#ifdef HAVE_LIMITS_H
+# include <limits.h>
+#endif
+
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#include "builtins.h"
+#include "shell.h"
+#include "bashgetopt.h"
+#include "common.h"
+
+#if !defined (errno)
+extern int errno;
+#endif
+
+#if !defined (_POSIX2_LINE_MAX)
+# define _POSIX2_LINE_MAX 2048
+#endif
+
+static int cflag;
+static char dchar;
+static int dflag;
+static int fflag;
+static int sflag;
+
+static int autostart, autostop, maxval;
+static char positions[_POSIX2_LINE_MAX + 1];
+
+static int c_cut __P((FILE *, char *));
+static int f_cut __P((FILE *, char *));
+static int get_list __P((char *));
+static char *_cut_strsep __P((char **, const char *));
+
+int
+cut_builtin(list)
+ WORD_LIST *list;
+{
+ FILE *fp;
+ int (*fcn) __P((FILE *, char *)) = NULL;
+ int ch;
+
+ fcn = NULL;
+ dchar = '\t'; /* default delimiter is \t */
+
+ /* Since we don't support multi-byte characters, the -c and -b
+ options are equivalent, and the -n option is meaningless. */
+ reset_internal_getopt ();
+ while ((ch = internal_getopt (list, "b:c:d:f:sn")) != -1)
+ switch(ch) {
+ case 'b':
+ case 'c':
+ fcn = c_cut;
+ if (get_list(list_optarg) < 0)
+ return (EXECUTION_FAILURE);
+ cflag = 1;
+ break;
+ case 'd':
+ dchar = *list_optarg;
+ dflag = 1;
+ break;
+ case 'f':
+ fcn = f_cut;
+ if (get_list(list_optarg) < 0)
+ return (EXECUTION_FAILURE);
+ fflag = 1;
+ break;
+ case 's':
+ sflag = 1;
+ break;
+ case 'n':
+ break;
+ case '?':
+ default:
+ builtin_usage();
+ return (EX_USAGE);
+ }
+
+ list = loptend;
+
+ if (fflag) {
+ if (cflag) {
+ builtin_usage();
+ return (EX_USAGE);
+ }
+ } else if (!cflag || dflag || sflag) {
+ builtin_usage();
+ return (EX_USAGE);
+ }
+
+ if (list) {
+ while (list) {
+ fp = fopen(list->word->word, "r");
+ if (fp == 0) {
+ builtin_error("%s", list->word->word);
+ return (EXECUTION_FAILURE);
+ }
+ ch = (*fcn)(fp, list->word->word);
+ (void)fclose(fp);
+ if (ch < 0)
+ return (EXECUTION_FAILURE);
+ list = list->next;
+ }
+ } else {
+ ch = (*fcn)(stdin, "stdin");
+ if (ch < 0)
+ return (EXECUTION_FAILURE);
+ }
+
+ return (EXECUTION_SUCCESS);
+}
+
+static int
+get_list(list)
+ char *list;
+{
+ int setautostart, start, stop;
+ char *pos;
+ char *p;
+
+ /*
+ * 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 = _cut_strsep(&list, ", \t")) != NULL;) {
+ setautostart = start = stop = 0;
+ if (*p == '-') {
+ ++p;
+ setautostart = 1;
+ }
+ if (isdigit((unsigned char)*p)) {
+ start = stop = strtol(p, &p, 10);
+ if (setautostart && start > autostart)
+ autostart = start;
+ }
+ if (*p == '-') {
+ if (isdigit((unsigned char)p[1]))
+ stop = strtol(p + 1, &p, 10);
+ if (*p == '-') {
+ ++p;
+ if (!autostop || autostop > stop)
+ autostop = stop;
+ }
+ }
+ if (*p) {
+ builtin_error("[-cf] list: illegal list value");
+ return -1;
+ }
+ if (!stop || !start) {
+ builtin_error("[-cf] list: values may not include zero");
+ return -1;
+ }
+ if (stop > _POSIX2_LINE_MAX) {
+ builtin_error("[-cf] list: %d too large (max %d)",
+ stop, _POSIX2_LINE_MAX);
+ return -1;
+ }
+ 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);
+
+ return 0;
+}
+
+/* ARGSUSED */
+static int
+c_cut(fp, fname)
+ FILE *fp;
+ char *fname;
+{
+ int ch, col;
+ char *pos;
+
+ ch = 0;
+ for (;;) {
+ pos = positions + 1;
+ for (col = maxval; col; --col) {
+ if ((ch = getc(fp)) == EOF)
+ return;
+ if (ch == '\n')
+ break;
+ if (*pos++)
+ (void)putchar(ch);
+ }
+ if (ch != '\n') {
+ if (autostop)
+ while ((ch = getc(fp)) != EOF && ch != '\n')
+ (void)putchar(ch);
+ else
+ while ((ch = getc(fp)) != EOF && ch != '\n');
+ }
+ (void)putchar('\n');
+ }
+ return (0);
+}
+
+static int
+f_cut(fp, fname)
+ FILE *fp;
+ char *fname;
+{
+ int ch, field, isdelim;
+ char *pos, *p, sep;
+ int output;
+ char lbuf[_POSIX2_LINE_MAX + 1];
+
+ for (sep = dchar; fgets(lbuf, sizeof(lbuf), fp);) {
+ output = 0;
+ for (isdelim = 0, p = lbuf;; ++p) {
+ if (!(ch = *p)) {
+ builtin_error("%s: line too long.", fname);
+ return -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++)
+ (void)putchar(sep);
+ while ((ch = *p++) != '\n' && ch != sep)
+ (void)putchar(ch);
+ } else {
+ while ((ch = *p++) != '\n' && ch != sep)
+ continue;
+ }
+ if (ch == '\n')
+ break;
+ }
+ if (ch != '\n') {
+ if (autostop) {
+ if (output)
+ (void)putchar(sep);
+ for (; (ch = *p) != '\n'; ++p)
+ (void)putchar(ch);
+ } else
+ for (; (ch = *p) != '\n'; ++p);
+ }
+ (void)putchar('\n');
+ }
+ return (0);
+}
+
+/*
+ * Get next token from string *stringp, where tokens are possibly-empty
+ * strings separated by characters from delim.
+ *
+ * Writes NULs into the string at *stringp to end tokens.
+ * delim need not remain constant from call to call.
+ * On return, *stringp points past the last NUL written (if there might
+ * be further tokens), or is NULL (if there are definitely no more tokens).
+ *
+ * If *stringp is NULL, strsep returns NULL.
+ */
+static char *
+_cut_strsep(stringp, delim)
+ register char **stringp;
+ register const char *delim;
+{
+ register char *s;
+ register const char *spanp;
+ register int c, sc;
+ char *tok;
+
+ if ((s = *stringp) == NULL)
+ return (NULL);
+ for (tok = s;;) {
+ c = *s++;
+ spanp = delim;
+ do {
+ if ((sc = *spanp++) == c) {
+ if (c == 0)
+ s = NULL;
+ else
+ s[-1] = 0;
+ *stringp = s;
+ return (tok);
+ }
+ } while (sc != 0);
+ }
+ /* NOTREACHED */
+}
+
+static char *cut_doc[] = {
+ "Select portions of lines.",
+ "",
+ "Select portions of each line (as specified by LIST) from each FILE",
+ "(by default, the standard input), and write them to the standard output.",
+ "Items specified by LIST are either column positions or fields delimited",
+ "by a special character. Column numbering starts at 1.",
+ (char *)0
+};
+
+struct builtin cut_struct = {
+ "cut",
+ cut_builtin,
+ BUILTIN_ENABLED,
+ cut_doc,
+ "cut -b list [-n] [file ...] OR cut -c list [file ...] OR cut -f list [-s] [-d delim] [file ...]",
+ 0
+};
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