Import /usr/src/lib/libedit from NetBSD 8.0

1 files changed, 579 insertions, 0 deletions

diff --git a/bin/cash/libedit/filecomplete.c b/bin/cash/libedit/filecomplete.c
new file mode 100644
index 00000000..6ccc2719
--- /dev/null
+++ b/bin/cash/libedit/filecomplete.c
@@ -0,0 +1,579 @@
+/*	$NetBSD: filecomplete.c,v 1.45 2017/04/21 05:38:03 abhinav Exp $	*/
+
+/*-
+ * Copyright (c) 1997 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jaromir Dolecek.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 "config.h"
+#if !defined(lint) && !defined(SCCSID)
+__RCSID("$NetBSD: filecomplete.c,v 1.45 2017/04/21 05:38:03 abhinav Exp $");
+#endif /* not lint && not SCCSID */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "el.h"
+#include "filecomplete.h"
+
+static const wchar_t break_chars[] = L" \t\n\"\\'`@$><=;|&{(";
+
+/********************************/
+/* completion functions */
+
+/*
+ * does tilde expansion of strings of type ``~user/foo''
+ * if ``user'' isn't valid user name or ``txt'' doesn't start
+ * w/ '~', returns pointer to strdup()ed copy of ``txt''
+ *
+ * it's the caller's responsibility to free() the returned string
+ */
+char *
+fn_tilde_expand(const char *txt)
+{
+#if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
+	struct passwd pwres;
+	char pwbuf[1024];
+#endif
+	struct passwd *pass;
+	char *temp;
+	size_t len = 0;
+
+	if (txt[0] != '~')
+		return strdup(txt);
+
+	temp = strchr(txt + 1, '/');
+	if (temp == NULL) {
+		temp = strdup(txt + 1);
+		if (temp == NULL)
+			return NULL;
+	} else {
+		/* text until string after slash */
+		len = (size_t)(temp - txt + 1);
+		temp = el_malloc(len * sizeof(*temp));
+		if (temp == NULL)
+			return NULL;
+		(void)strncpy(temp, txt + 1, len - 2);
+		temp[len - 2] = '\0';
+	}
+	if (temp[0] == 0) {
+#ifdef HAVE_GETPW_R_POSIX
+		if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
+		    &pass) != 0)
+			pass = NULL;
+#elif HAVE_GETPW_R_DRAFT
+		pass = getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf));
+#else
+		pass = getpwuid(getuid());
+#endif
+	} else {
+#ifdef HAVE_GETPW_R_POSIX
+		if (getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf), &pass) != 0)
+			pass = NULL;
+#elif HAVE_GETPW_R_DRAFT
+		pass = getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf));
+#else
+		pass = getpwnam(temp);
+#endif
+	}
+	el_free(temp);		/* value no more needed */
+	if (pass == NULL)
+		return strdup(txt);
+
+	/* update pointer txt to point at string immedially following */
+	/* first slash */
+	txt += len;
+
+	len = strlen(pass->pw_dir) + 1 + strlen(txt) + 1;
+	temp = el_malloc(len * sizeof(*temp));
+	if (temp == NULL)
+		return NULL;
+	(void)snprintf(temp, len, "%s/%s", pass->pw_dir, txt);
+
+	return temp;
+}
+
+
+/*
+ * return first found file name starting by the ``text'' or NULL if no
+ * such file can be found
+ * value of ``state'' is ignored
+ *
+ * it's the caller's responsibility to free the returned string
+ */
+char *
+fn_filename_completion_function(const char *text, int state)
+{
+	static DIR *dir = NULL;
+	static char *filename = NULL, *dirname = NULL, *dirpath = NULL;
+	static size_t filename_len = 0;
+	struct dirent *entry;
+	char *temp;
+	size_t len;
+
+	if (state == 0 || dir == NULL) {
+		temp = strrchr(text, '/');
+		if (temp) {
+			char *nptr;
+			temp++;
+			nptr = el_realloc(filename, (strlen(temp) + 1) *
+			    sizeof(*nptr));
+			if (nptr == NULL) {
+				el_free(filename);
+				filename = NULL;
+				return NULL;
+			}
+			filename = nptr;
+			(void)strcpy(filename, temp);
+			len = (size_t)(temp - text);	/* including last slash */
+
+			nptr = el_realloc(dirname, (len + 1) *
+			    sizeof(*nptr));
+			if (nptr == NULL) {
+				el_free(dirname);
+				dirname = NULL;
+				return NULL;
+			}
+			dirname = nptr;
+			(void)strncpy(dirname, text, len);
+			dirname[len] = '\0';
+		} else {
+			el_free(filename);
+			if (*text == 0)
+				filename = NULL;
+			else {
+				filename = strdup(text);
+				if (filename == NULL)
+					return NULL;
+			}
+			el_free(dirname);
+			dirname = NULL;
+		}
+
+		if (dir != NULL) {
+			(void)closedir(dir);
+			dir = NULL;
+		}
+
+		/* support for ``~user'' syntax */
+
+		el_free(dirpath);
+		dirpath = NULL;
+		if (dirname == NULL) {
+			if ((dirname = strdup("")) == NULL)
+				return NULL;
+			dirpath = strdup("./");
+		} else if (*dirname == '~')
+			dirpath = fn_tilde_expand(dirname);
+		else
+			dirpath = strdup(dirname);
+
+		if (dirpath == NULL)
+			return NULL;
+
+		dir = opendir(dirpath);
+		if (!dir)
+			return NULL;	/* cannot open the directory */
+
+		/* will be used in cycle */
+		filename_len = filename ? strlen(filename) : 0;
+	}
+
+	/* find the match */
+	while ((entry = readdir(dir)) != NULL) {
+		/* skip . and .. */
+		if (entry->d_name[0] == '.' && (!entry->d_name[1]
+		    || (entry->d_name[1] == '.' && !entry->d_name[2])))
+			continue;
+		if (filename_len == 0)
+			break;
+		/* otherwise, get first entry where first */
+		/* filename_len characters are equal	  */
+		if (entry->d_name[0] == filename[0]
+#if HAVE_STRUCT_DIRENT_D_NAMLEN
+		    && entry->d_namlen >= filename_len
+#else
+		    && strlen(entry->d_name) >= filename_len
+#endif
+		    && strncmp(entry->d_name, filename,
+			filename_len) == 0)
+			break;
+	}
+
+	if (entry) {		/* match found */
+
+#if HAVE_STRUCT_DIRENT_D_NAMLEN
+		len = entry->d_namlen;
+#else
+		len = strlen(entry->d_name);
+#endif
+
+		len = strlen(dirname) + len + 1;
+		temp = el_malloc(len * sizeof(*temp));
+		if (temp == NULL)
+			return NULL;
+		(void)snprintf(temp, len, "%s%s", dirname, entry->d_name);
+	} else {
+		(void)closedir(dir);
+		dir = NULL;
+		temp = NULL;
+	}
+
+	return temp;
+}
+
+
+static const char *
+append_char_function(const char *name)
+{
+	struct stat stbuf;
+	char *expname = *name == '~' ? fn_tilde_expand(name) : NULL;
+	const char *rs = " ";
+
+	if (stat(expname ? expname : name, &stbuf) == -1)
+		goto out;
+	if (S_ISDIR(stbuf.st_mode))
+		rs = "/";
+out:
+	if (expname)
+		el_free(expname);
+	return rs;
+}
+/*
+ * returns list of completions for text given
+ * non-static for readline.
+ */
+char ** completion_matches(const char *, char *(*)(const char *, int));
+char **
+completion_matches(const char *text, char *(*genfunc)(const char *, int))
+{
+	char **match_list = NULL, *retstr, *prevstr;
+	size_t match_list_len, max_equal, which, i;
+	size_t matches;
+
+	matches = 0;
+	match_list_len = 1;
+	while ((retstr = (*genfunc) (text, (int)matches)) != NULL) {
+		/* allow for list terminator here */
+		if (matches + 3 >= match_list_len) {
+			char **nmatch_list;
+			while (matches + 3 >= match_list_len)
+				match_list_len <<= 1;
+			nmatch_list = el_realloc(match_list,
+			    match_list_len * sizeof(*nmatch_list));
+			if (nmatch_list == NULL) {
+				el_free(match_list);
+				return NULL;
+			}
+			match_list = nmatch_list;
+
+		}
+		match_list[++matches] = retstr;
+	}
+
+	if (!match_list)
+		return NULL;	/* nothing found */
+
+	/* find least denominator and insert it to match_list[0] */
+	which = 2;
+	prevstr = match_list[1];
+	max_equal = strlen(prevstr);
+	for (; which <= matches; which++) {
+		for (i = 0; i < max_equal &&
+		    prevstr[i] == match_list[which][i]; i++)
+			continue;
+		max_equal = i;
+	}
+
+	retstr = el_malloc((max_equal + 1) * sizeof(*retstr));
+	if (retstr == NULL) {
+		el_free(match_list);
+		return NULL;
+	}
+	(void)strncpy(retstr, match_list[1], max_equal);
+	retstr[max_equal] = '\0';
+	match_list[0] = retstr;
+
+	/* add NULL as last pointer to the array */
+	match_list[matches + 1] = NULL;
+
+	return match_list;
+}
+
+/*
+ * Sort function for qsort(). Just wrapper around strcasecmp().
+ */
+static int
+_fn_qsort_string_compare(const void *i1, const void *i2)
+{
+	const char *s1 = ((const char * const *)i1)[0];
+	const char *s2 = ((const char * const *)i2)[0];
+
+	return strcasecmp(s1, s2);
+}
+
+/*
+ * Display list of strings in columnar format on readline's output stream.
+ * 'matches' is list of strings, 'num' is number of strings in 'matches',
+ * 'width' is maximum length of string in 'matches'.
+ *
+ * matches[0] is not one of the match strings, but it is counted in
+ * num, so the strings are matches[1] *through* matches[num-1].
+ */
+void
+fn_display_match_list(EditLine * el, char **matches, size_t num, size_t width,
+    const char *(*app_func) (const char *))
+{
+	size_t line, lines, col, cols, thisguy;
+	int screenwidth = el->el_terminal.t_size.h;
+	if (app_func == NULL)
+		app_func = append_char_function;
+
+	/* Ignore matches[0]. Avoid 1-based array logic below. */
+	matches++;
+	num--;
+
+	/*
+	 * Find out how many entries can be put on one line; count
+	 * with one space between strings the same way it's printed.
+	 */
+	cols = (size_t)screenwidth / (width + 1);
+	if (cols == 0)
+		cols = 1;
+
+	/* how many lines of output, rounded up */
+	lines = (num + cols - 1) / cols;
+
+	/* Sort the items. */
+	qsort(matches, num, sizeof(char *), _fn_qsort_string_compare);
+
+	/*
+	 * On the ith line print elements i, i+lines, i+lines*2, etc.
+	 */
+	for (line = 0; line < lines; line++) {
+		for (col = 0; col < cols; col++) {
+			thisguy = line + col * lines;
+			if (thisguy >= num)
+				break;
+			(void)fprintf(el->el_outfile, "%s%s%s",
+			    col == 0 ? "" : " ", matches[thisguy],
+				append_char_function(matches[thisguy]));
+			(void)fprintf(el->el_outfile, "%-*s",
+				(int) (width - strlen(matches[thisguy])), "");
+		}
+		(void)fprintf(el->el_outfile, "\n");
+	}
+}
+
+/*
+ * Complete the word at or before point,
+ * 'what_to_do' says what to do with the completion.
+ * \t   means do standard completion.
+ * `?' means list the possible completions.
+ * `*' means insert all of the possible completions.
+ * `!' means to do standard completion, and list all possible completions if
+ * there is more than one.
+ *
+ * Note: '*' support is not implemented
+ *       '!' could never be invoked
+ */
+int
+fn_complete(EditLine *el,
+	char *(*complet_func)(const char *, int),
+	char **(*attempted_completion_function)(const char *, int, int),
+	const wchar_t *word_break, const wchar_t *special_prefixes,
+	const char *(*app_func)(const char *), size_t query_items,
+	int *completion_type, int *over, int *point, int *end)
+{
+	const LineInfoW *li;
+	wchar_t *temp;
+        char **matches;
+	const wchar_t *ctemp;
+	size_t len;
+	int what_to_do = '\t';
+	int retval = CC_NORM;
+
+	if (el->el_state.lastcmd == el->el_state.thiscmd)
+		what_to_do = '?';
+
+	/* readline's rl_complete() has to be told what we did... */
+	if (completion_type != NULL)
+		*completion_type = what_to_do;
+
+	if (!complet_func)
+		complet_func = fn_filename_completion_function;
+	if (!app_func)
+		app_func = append_char_function;
+
+	/* We now look backwards for the start of a filename/variable word */
+	li = el_wline(el);
+	ctemp = li->cursor;
+	while (ctemp > li->buffer
+	    && !wcschr(word_break, ctemp[-1])
+	    && (!special_prefixes || !wcschr(special_prefixes, ctemp[-1]) ) )
+		ctemp--;
+
+	len = (size_t)(li->cursor - ctemp);
+	temp = el_malloc((len + 1) * sizeof(*temp));
+	(void)wcsncpy(temp, ctemp, len);
+	temp[len] = '\0';
+
+	/* these can be used by function called in completion_matches() */
+	/* or (*attempted_completion_function)() */
+	if (point != NULL)
+		*point = (int)(li->cursor - li->buffer);
+	if (end != NULL)
+		*end = (int)(li->lastchar - li->buffer);
+
+	if (attempted_completion_function) {
+		int cur_off = (int)(li->cursor - li->buffer);
+		matches = (*attempted_completion_function)(
+		    ct_encode_string(temp, &el->el_scratch),
+		    cur_off - (int)len, cur_off);
+	} else
+		matches = NULL;
+	if (!attempted_completion_function ||
+	    (over != NULL && !*over && !matches))
+		matches = completion_matches(
+		    ct_encode_string(temp, &el->el_scratch), complet_func);
+
+	if (over != NULL)
+		*over = 0;
+
+	if (matches) {
+		int i;
+		size_t matches_num, maxlen, match_len, match_display=1;
+
+		retval = CC_REFRESH;
+		/*
+		 * Only replace the completed string with common part of
+		 * possible matches if there is possible completion.
+		 */
+		if (matches[0][0] != '\0') {
+			el_deletestr(el, (int) len);
+			el_winsertstr(el,
+			    ct_decode_string(matches[0], &el->el_scratch));
+		}
+
+
+		if (matches[2] == NULL &&
+		    (matches[1] == NULL || strcmp(matches[0], matches[1]) == 0)) {
+			/*
+			 * We found exact match. Add a space after
+			 * it, unless we do filename completion and the
+			 * object is a directory.
+			 */
+			el_winsertstr(el,
+			    ct_decode_string((*app_func)(matches[0]),
+			    &el->el_scratch));
+		} else if (what_to_do == '!' || what_to_do == '?') {
+			/*
+			 * More than one match and requested to list possible
+			 * matches.
+			 */
+
+			for(i = 1, maxlen = 0; matches[i]; i++) {
+				match_len = strlen(matches[i]);
+				if (match_len > maxlen)
+					maxlen = match_len;
+			}
+			/* matches[1] through matches[i-1] are available */
+			matches_num = (size_t)(i - 1);
+
+			/* newline to get on next line from command line */
+			(void)fprintf(el->el_outfile, "\n");
+
+			/*
+			 * If there are too many items, ask user for display
+			 * confirmation.
+			 */
+			if (matches_num > query_items) {
+				(void)fprintf(el->el_outfile,
+				    "Display all %zu possibilities? (y or n) ",
+				    matches_num);
+				(void)fflush(el->el_outfile);
+				if (getc(stdin) != 'y')
+					match_display = 0;
+				(void)fprintf(el->el_outfile, "\n");
+			}
+
+			if (match_display) {
+				/*
+				 * Interface of this function requires the
+				 * strings be matches[1..num-1] for compat.
+				 * We have matches_num strings not counting
+				 * the prefix in matches[0], so we need to
+				 * add 1 to matches_num for the call.
+				 */
+				fn_display_match_list(el, matches,
+				    matches_num+1, maxlen, app_func);
+			}
+			retval = CC_REDISPLAY;
+		} else if (matches[0][0]) {
+			/*
+			 * There was some common match, but the name was
+			 * not complete enough. Next tab will print possible
+			 * completions.
+			 */
+			el_beep(el);
+		} else {
+			/* lcd is not a valid object - further specification */
+			/* is needed */
+			el_beep(el);
+			retval = CC_NORM;
+		}
+
+		/* free elements of array and the array itself */
+		for (i = 0; matches[i]; i++)
+			el_free(matches[i]);
+		el_free(matches);
+		matches = NULL;
+	}
+	el_free(temp);
+	return retval;
+}
+
+/*
+ * el-compatible wrapper around rl_complete; needed for key binding
+ */
+/* ARGSUSED */
+unsigned char
+_el_fn_complete(EditLine *el, int ch __attribute__((__unused__)))
+{
+	return (unsigned char)fn_complete(el, NULL, NULL,
+	    break_chars, NULL, NULL, (size_t)100,
+	    NULL, NULL, NULL, NULL);
+}