usr/dash/histedit.c

/*-
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1997-2005
 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * 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 <sys/param.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/*
 * Editline and history functions (and glue).
 */
#include "shell.h"
#include "parser.h"
#include "var.h"
#include "options.h"
#include "main.h"
#include "output.h"
#include "mystring.h"
#include "error.h"
#ifndef SMALL
#include "myhistedit.h"
#include "eval.h"
#include "memalloc.h"

#define MAXHISTLOOPS	4	/* max recursions through fc */
#define DEFEDITOR	"ed"	/* default editor *should* be $EDITOR */

History *hist;	/* history cookie */
EditLine *el;	/* editline cookie */
int displayhist;
static FILE *el_in, *el_out;

STATIC const char *fc_replace(const char *, char *, char *);

#ifdef DEBUG
extern FILE *tracefile;
#endif

/*
 * Set history and editing status.  Called whenever the status may
 * have changed (figures out what to do).
 */
void
histedit(void)
{
	FILE *el_err;

#define editing (Eflag || Vflag)

	if (iflag) {
		if (!hist) {
			/*
			 * turn history on
			 */
			INTOFF;
			hist = history_init();
			INTON;

			if (hist != NULL)
				sethistsize(histsizeval());
			else
				out2str("sh: can't initialize history\n");
		}
		if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
			/*
			 * turn editing on
			 */
			INTOFF;
			if (el_in == NULL)
				el_in = fdopen(0, "r");
			if (el_out == NULL)
				el_out = fdopen(2, "w");
			if (el_in == NULL || el_out == NULL)
				goto bad;
			el_err = el_out;
#if DEBUG
			if (tracefile)
				el_err = tracefile;
#endif
			el = el_init(arg0, el_in, el_out, el_err);
			if (el != NULL) {
				if (hist)
					el_set(el, EL_HIST, history, hist);
				el_set(el, EL_PROMPT, getprompt);
			} else {
bad:
				out2str("sh: can't initialize editing\n");
			}
			INTON;
		} else if (!editing && el) {
			INTOFF;
			el_end(el);
			el = NULL;
			INTON;
		}
		if (el) {
			if (Vflag)
				el_set(el, EL_EDITOR, "vi");
			else if (Eflag)
				el_set(el, EL_EDITOR, "emacs");
			el_source(el, NULL);
		}
	} else {
		INTOFF;
		if (el) {	/* no editing if not interactive */
			el_end(el);
			el = NULL;
		}
		if (hist) {
			history_end(hist);
			hist = NULL;
		}
		INTON;
	}
}


void
sethistsize(const char *hs)
{
	int histsize;
	HistEvent he;

	if (hist != NULL) {
		if (hs == NULL || *hs == '\0' ||
		   (histsize = atoi(hs)) < 0)
			histsize = 100;
		history(hist, &he, H_SETSIZE, histsize);
	}
}

void
setterm(const char *term)
{
	if (el != NULL && term != NULL)
		if (el_set(el, EL_TERMINAL, term) != 0) {
			outfmt(out2, "sh: Can't set terminal type %s\n", term);
			outfmt(out2, "sh: Using dumb terminal settings.\n");
		}
}

/*
 *  This command is provided since POSIX decided to standardize
 *  the Korn shell fc command.  Oh well...
 */
int
histcmd(int argc, char **argv)
{
	int ch;
	const char *editor = NULL;
	HistEvent he;
	int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
	int i, retval;
	const char *firststr, *laststr;
	int first, last, direction;
	char *pat = NULL, *repl;	/* ksh "fc old=new" crap */
	static int active = 0;
	struct jmploc jmploc;
	struct jmploc *volatile savehandler;
	char editfile[MAXPATHLEN + 1];
	FILE *efp;
#ifdef __GNUC__
	/* Avoid longjmp clobbering */
	(void) &editor;
	(void) &lflg;
	(void) &nflg;
	(void) &rflg;
	(void) &sflg;
	(void) &firststr;
	(void) &laststr;
	(void) &pat;
	(void) &repl;
	(void) &efp;
	(void) &argc;
	(void) &argv;
#endif

	if (hist == NULL)
		sh_error("history not active");

	if (argc == 1)
		sh_error("missing history argument");

#ifdef __GLIBC__
	optind = 0;
#else
	optreset = 1; optind = 1; /* initialize getopt */
#endif
	while (not_fcnumber(argv[optind]) &&
	      (ch = getopt(argc, argv, ":e:lnrs")) != -1)
		switch ((char)ch) {
		case 'e':
			editor = optionarg;
			break;
		case 'l':
			lflg = 1;
			break;
		case 'n':
			nflg = 1;
			break;
		case 'r':
			rflg = 1;
			break;
		case 's':
			sflg = 1;
			break;
		case ':':
			sh_error("option -%c expects argument", optopt);
			/* NOTREACHED */
		case '?':
		default:
			sh_error("unknown option: -%c", optopt);
			/* NOTREACHED */
		}
	argc -= optind, argv += optind;

	/*
	 * If executing...
	 */
	if (lflg == 0 || editor || sflg) {
		lflg = 0;	/* ignore */
		editfile[0] = '\0';
		/*
		 * Catch interrupts to reset active counter and
		 * cleanup temp files.
		 */
		if (setjmp(jmploc.loc)) {
			active = 0;
			if (*editfile)
				unlink(editfile);
			handler = savehandler;
			longjmp(handler->loc, 1);
		}
		savehandler = handler;
		handler = &jmploc;
		if (++active > MAXHISTLOOPS) {
			active = 0;
			displayhist = 0;
			sh_error("called recursively too many times");
		}
		/*
		 * Set editor.
		 */
		if (sflg == 0) {
			if (editor == NULL &&
			    (editor = bltinlookup("FCEDIT")) == NULL &&
			    (editor = bltinlookup("EDITOR")) == NULL)
				editor = DEFEDITOR;
			if (editor[0] == '-' && editor[1] == '\0') {
				sflg = 1;	/* no edit */
				editor = NULL;
			}
		}
	}

	/*
	 * If executing, parse [old=new] now
	 */
	if (lflg == 0 && argc > 0 &&
	     ((repl = strchr(argv[0], '=')) != NULL)) {
		pat = argv[0];
		*repl++ = '\0';
		argc--, argv++;
	}
	/*
	 * determine [first] and [last]
	 */
	switch (argc) {
	case 0:
		firststr = lflg ? "-16" : "-1";
		laststr = "-1";
		break;
	case 1:
		firststr = argv[0];
		laststr = lflg ? "-1" : argv[0];
		break;
	case 2:
		firststr = argv[0];
		laststr = argv[1];
		break;
	default:
		sh_error("too many args");
		/* NOTREACHED */
	}
	/*
	 * Turn into event numbers.
	 */
	first = str_to_event(firststr, 0);
	last = str_to_event(laststr, 1);

	if (rflg) {
		i = last;
		last = first;
		first = i;
	}
	/*
	 * XXX - this should not depend on the event numbers
	 * always increasing.  Add sequence numbers or offset
	 * to the history element in next (diskbased) release.
	 */
	direction = first < last ? H_PREV : H_NEXT;

	/*
	 * If editing, grab a temp file.
	 */
	if (editor) {
		int fd;
		INTOFF;		/* easier */
		sprintf(editfile, "%s_shXXXXXX", _PATH_TMP);
		if ((fd = mkstemp(editfile)) < 0)
			sh_error("can't create temporary file %s", editfile);
		if ((efp = fdopen(fd, "w")) == NULL) {
			close(fd);
			sh_error("can't allocate stdio buffer for temp");
		}
	}

	/*
	 * Loop through selected history events.  If listing or executing,
	 * do it now.  Otherwise, put into temp file and call the editor
	 * after.
	 *
	 * The history interface needs rethinking, as the following
	 * convolutions will demonstrate.
	 */
	history(hist, &he, H_FIRST);
	retval = history(hist, &he, H_NEXT_EVENT, first);
	for (;retval != -1; retval = history(hist, &he, direction)) {
		if (lflg) {
			if (!nflg)
				out1fmt("%5d ", he.num);
			out1str(he.str);
		} else {
			const char *s = pat ?
			   fc_replace(he.str, pat, repl) : he.str;

			if (sflg) {
				if (displayhist) {
					out2str(s);
				}

				evalstring(strcpy(stalloc(strlen(s) + 1), s),
					   0);
				if (displayhist && hist) {
					/*
					 *  XXX what about recursive and
					 *  relative histnums.
					 */
					history(hist, &he, H_ENTER, s);
				}
			} else
				fputs(s, efp);
		}
		/*
		 * At end?  (if we were to lose last, we'd sure be
		 * messed up).
		 */
		if (he.num == last)
			break;
	}
	if (editor) {
		char *editcmd;

		fclose(efp);
		editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
		sprintf(editcmd, "%s %s", editor, editfile);
		/* XXX - should use no JC command */
		evalstring(editcmd, 0);
		INTON;
		readcmdfile(editfile);	/* XXX - should read back - quick tst */
		unlink(editfile);
	}

	if (lflg == 0 && active > 0)
		--active;
	if (displayhist)
		displayhist = 0;
	return 0;
}

STATIC const char *
fc_replace(const char *s, char *p, char *r)
{
	char *dest;
	int plen = strlen(p);

	STARTSTACKSTR(dest);
	while (*s) {
		if (*s == *p && strncmp(s, p, plen) == 0) {
			while (*r)
				STPUTC(*r++, dest);
			s += plen;
			*p = '\0';	/* so no more matches */
		} else
			STPUTC(*s++, dest);
	}
	STACKSTRNUL(dest);
	dest = grabstackstr(dest);

	return (dest);
}

int
not_fcnumber(char *s)
{
	if (s == NULL)
		return 0;
        if (*s == '-')
                s++;
	return (!is_number(s));
}

int
str_to_event(const char *str, int last)
{
	HistEvent he;
	const char *s = str;
	int relative = 0;
	int i, retval;

	retval = history(hist, &he, H_FIRST);
	switch (*s) {
	case '-':
		relative = 1;
		/*FALLTHROUGH*/
	case '+':
		s++;
	}
	if (is_number(s)) {
		i = atoi(s);
		if (relative) {
			while (retval != -1 && i--) {
				retval = history(hist, &he, H_NEXT);
			}
			if (retval == -1)
				retval = history(hist, &he, H_LAST);
		} else {
			retval = history(hist, &he, H_NEXT_EVENT, i);
			if (retval == -1) {
				/*
				 * the notion of first and last is
				 * backwards to that of the history package
				 */
				retval = history(hist, &he,
						last ? H_FIRST : H_LAST);
			}
		}
		if (retval == -1)
			sh_error("history number %s not found (internal error)",
				 str);
	} else {
		/*
		 * pattern
		 */
		retval = history(hist, &he, H_PREV_STR, str);
		if (retval == -1)
			sh_error("history pattern not found: %s", str);
	}
	return (he.num);
}
#endif
1	niro	532	/*-
2			* Copyright (c) 1993
3			* The Regents of the University of California. All rights reserved.
4			* Copyright (c) 1997-2005
5			* Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved.
6			*
7			* This code is derived from software contributed to Berkeley by
8			* Kenneth Almquist.
9			*
10			* Redistribution and use in source and binary forms, with or without
11			* modification, are permitted provided that the following conditions
12			* are met:
13			* 1. Redistributions of source code must retain the above copyright
14			* notice, this list of conditions and the following disclaimer.
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in the
17			* documentation and/or other materials provided with the distribution.
18			* 3. Neither the name of the University nor the names of its contributors
19			* may be used to endorse or promote products derived from this software
20			* without specific prior written permission.
21			*
22			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32			* SUCH DAMAGE.
33			*/
34
35			#include <sys/param.h>
36			#include <paths.h>
37			#include <stdio.h>
38			#include <stdlib.h>
39			#include <unistd.h>
40			/*
41			* Editline and history functions (and glue).
42			*/
43			#include "shell.h"
44			#include "parser.h"
45			#include "var.h"
46			#include "options.h"
47			#include "main.h"
48			#include "output.h"
49			#include "mystring.h"
50			#include "error.h"
51			#ifndef SMALL
52			#include "myhistedit.h"
53			#include "eval.h"
54			#include "memalloc.h"
55
56			#define MAXHISTLOOPS 4 /* max recursions through fc */
57			#define DEFEDITOR "ed" /* default editor should be $EDITOR */
58
59			History hist; / history cookie */
60			EditLine el; / editline cookie */
61			int displayhist;
62			static FILE el_in, el_out;
63
64			STATIC const char fc_replace(const char , char , char );
65
66			#ifdef DEBUG
67			extern FILE *tracefile;
68			#endif
69
70			/*
71			* Set history and editing status. Called whenever the status may
72			* have changed (figures out what to do).
73			*/
74			void
75			histedit(void)
76			{
77			FILE *el_err;
78
79			#define editing (Eflag \|\| Vflag)
80
81			if (iflag) {
82			if (!hist) {
83			/*
84			* turn history on
85			*/
86			INTOFF;
87			hist = history_init();
88			INTON;
89
90			if (hist != NULL)
91			sethistsize(histsizeval());
92			else
93			out2str("sh: can't initialize history\n");
94			}
95			if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
96			/*
97			* turn editing on
98			*/
99			INTOFF;
100			if (el_in == NULL)
101			el_in = fdopen(0, "r");
102			if (el_out == NULL)
103			el_out = fdopen(2, "w");
104			if (el_in == NULL \|\| el_out == NULL)
105			goto bad;
106			el_err = el_out;
107			#if DEBUG
108			if (tracefile)
109			el_err = tracefile;
110			#endif
111			el = el_init(arg0, el_in, el_out, el_err);
112			if (el != NULL) {
113			if (hist)
114			el_set(el, EL_HIST, history, hist);
115			el_set(el, EL_PROMPT, getprompt);
116			} else {
117			bad:
118			out2str("sh: can't initialize editing\n");
119			}
120			INTON;
121			} else if (!editing && el) {
122			INTOFF;
123			el_end(el);
124			el = NULL;
125			INTON;
126			}
127			if (el) {
128			if (Vflag)
129			el_set(el, EL_EDITOR, "vi");
130			else if (Eflag)
131			el_set(el, EL_EDITOR, "emacs");
132			el_source(el, NULL);
133			}
134			} else {
135			INTOFF;
136			if (el) { /* no editing if not interactive */
137			el_end(el);
138			el = NULL;
139			}
140			if (hist) {
141			history_end(hist);
142			hist = NULL;
143			}
144			INTON;
145			}
146			}
147
148
149			void
150			sethistsize(const char *hs)
151			{
152			int histsize;
153			HistEvent he;
154
155			if (hist != NULL) {
156			if (hs == NULL \|\| *hs == '\0' \|\|
157			(histsize = atoi(hs)) < 0)
158			histsize = 100;
159			history(hist, &he, H_SETSIZE, histsize);
160			}
161			}
162
163			void
164			setterm(const char *term)
165			{
166			if (el != NULL && term != NULL)
167			if (el_set(el, EL_TERMINAL, term) != 0) {
168			outfmt(out2, "sh: Can't set terminal type %s\n", term);
169			outfmt(out2, "sh: Using dumb terminal settings.\n");
170			}
171			}
172
173			/*
174			* This command is provided since POSIX decided to standardize
175			* the Korn shell fc command. Oh well...
176			*/
177			int
178			histcmd(int argc, char **argv)
179			{
180			int ch;
181			const char *editor = NULL;
182			HistEvent he;
183			int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
184			int i, retval;
185			const char firststr, laststr;
186			int first, last, direction;
187			char pat = NULL, repl; /* ksh "fc old=new" crap */
188			static int active = 0;
189			struct jmploc jmploc;
190			struct jmploc *volatile savehandler;
191			char editfile[MAXPATHLEN + 1];
192			FILE *efp;
193			#ifdef __GNUC__
194			/* Avoid longjmp clobbering */
195			(void) &editor;
196			(void) &lflg;
197			(void) &nflg;
198			(void) &rflg;
199			(void) &sflg;
200			(void) &firststr;
201			(void) &laststr;
202			(void) &pat;
203			(void) &repl;
204			(void) &efp;
205			(void) &argc;
206			(void) &argv;
207			#endif
208
209			if (hist == NULL)
210			sh_error("history not active");
211
212			if (argc == 1)
213			sh_error("missing history argument");
214
215			#ifdef __GLIBC__
216			optind = 0;
217			#else
218			optreset = 1; optind = 1; /* initialize getopt */
219			#endif
220			while (not_fcnumber(argv[optind]) &&
221			(ch = getopt(argc, argv, ":e:lnrs")) != -1)
222			switch ((char)ch) {
223			case 'e':
224			editor = optionarg;
225			break;
226			case 'l':
227			lflg = 1;
228			break;
229			case 'n':
230			nflg = 1;
231			break;
232			case 'r':
233			rflg = 1;
234			break;
235			case 's':
236			sflg = 1;
237			break;
238			case ':':
239			sh_error("option -%c expects argument", optopt);
240			/* NOTREACHED */
241			case '?':
242			default:
243			sh_error("unknown option: -%c", optopt);
244			/* NOTREACHED */
245			}
246			argc -= optind, argv += optind;
247
248			/*
249			* If executing...
250			*/
251			if (lflg == 0 \|\| editor \|\| sflg) {
252			lflg = 0; /* ignore */
253			editfile[0] = '\0';
254			/*
255			* Catch interrupts to reset active counter and
256			* cleanup temp files.
257			*/
258			if (setjmp(jmploc.loc)) {
259			active = 0;
260			if (*editfile)
261			unlink(editfile);
262			handler = savehandler;
263			longjmp(handler->loc, 1);
264			}
265			savehandler = handler;
266			handler = &jmploc;
267			if (++active > MAXHISTLOOPS) {
268			active = 0;
269			displayhist = 0;
270			sh_error("called recursively too many times");
271			}
272			/*
273			* Set editor.
274			*/
275			if (sflg == 0) {
276			if (editor == NULL &&
277			(editor = bltinlookup("FCEDIT")) == NULL &&
278			(editor = bltinlookup("EDITOR")) == NULL)
279			editor = DEFEDITOR;
280			if (editor[0] == '-' && editor[1] == '\0') {
281			sflg = 1; /* no edit */
282			editor = NULL;
283			}
284			}
285			}
286
287			/*
288			* If executing, parse [old=new] now
289			*/
290			if (lflg == 0 && argc > 0 &&
291			((repl = strchr(argv[0], '=')) != NULL)) {
292			pat = argv[0];
293			*repl++ = '\0';
294			argc--, argv++;
295			}
296			/*
297			* determine [first] and [last]
298			*/
299			switch (argc) {
300			case 0:
301			firststr = lflg ? "-16" : "-1";
302			laststr = "-1";
303			break;
304			case 1:
305			firststr = argv[0];
306			laststr = lflg ? "-1" : argv[0];
307			break;
308			case 2:
309			firststr = argv[0];
310			laststr = argv[1];
311			break;
312			default:
313			sh_error("too many args");
314			/* NOTREACHED */
315			}
316			/*
317			* Turn into event numbers.
318			*/
319			first = str_to_event(firststr, 0);
320			last = str_to_event(laststr, 1);
321
322			if (rflg) {
323			i = last;
324			last = first;
325			first = i;
326			}
327			/*
328			* XXX - this should not depend on the event numbers
329			* always increasing. Add sequence numbers or offset
330			* to the history element in next (diskbased) release.
331			*/
332			direction = first < last ? H_PREV : H_NEXT;
333
334			/*
335			* If editing, grab a temp file.
336			*/
337			if (editor) {
338			int fd;
339			INTOFF; /* easier */
340			sprintf(editfile, "%s_shXXXXXX", _PATH_TMP);
341			if ((fd = mkstemp(editfile)) < 0)
342			sh_error("can't create temporary file %s", editfile);
343			if ((efp = fdopen(fd, "w")) == NULL) {
344			close(fd);
345			sh_error("can't allocate stdio buffer for temp");
346			}
347			}
348
349			/*
350			* Loop through selected history events. If listing or executing,
351			* do it now. Otherwise, put into temp file and call the editor
352			* after.
353			*
354			* The history interface needs rethinking, as the following
355			* convolutions will demonstrate.
356			*/
357			history(hist, &he, H_FIRST);
358			retval = history(hist, &he, H_NEXT_EVENT, first);
359			for (;retval != -1; retval = history(hist, &he, direction)) {
360			if (lflg) {
361			if (!nflg)
362			out1fmt("%5d ", he.num);
363			out1str(he.str);
364			} else {
365			const char *s = pat ?
366			fc_replace(he.str, pat, repl) : he.str;
367
368			if (sflg) {
369			if (displayhist) {
370			out2str(s);
371			}
372
373			evalstring(strcpy(stalloc(strlen(s) + 1), s),
374	niro	1122	0);
375	niro	532	if (displayhist && hist) {
376			/*
377			* XXX what about recursive and
378			* relative histnums.
379			*/
380			history(hist, &he, H_ENTER, s);
381			}
382			} else
383			fputs(s, efp);
384			}
385			/*
386			* At end? (if we were to lose last, we'd sure be
387			* messed up).
388			*/
389			if (he.num == last)
390			break;
391			}
392			if (editor) {
393			char *editcmd;
394
395			fclose(efp);
396			editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
397			sprintf(editcmd, "%s %s", editor, editfile);
398			/* XXX - should use no JC command */
399	niro	1122	evalstring(editcmd, 0);
400	niro	532	INTON;
401			readcmdfile(editfile); /* XXX - should read back - quick tst */
402			unlink(editfile);
403			}
404
405			if (lflg == 0 && active > 0)
406			--active;
407			if (displayhist)
408			displayhist = 0;
409			return 0;
410			}
411
412			STATIC const char *
413			fc_replace(const char s, char p, char *r)
414			{
415			char *dest;
416			int plen = strlen(p);
417
418			STARTSTACKSTR(dest);
419			while (*s) {
420			if (s == p && strncmp(s, p, plen) == 0) {
421			while (*r)
422			STPUTC(*r++, dest);
423			s += plen;
424			p = '\0'; / so no more matches */
425			} else
426			STPUTC(*s++, dest);
427			}
428			STACKSTRNUL(dest);
429			dest = grabstackstr(dest);
430
431			return (dest);
432			}
433
434			int
435			not_fcnumber(char *s)
436			{
437			if (s == NULL)
438			return 0;
439			if (*s == '-')
440			s++;
441			return (!is_number(s));
442			}
443
444			int
445			str_to_event(const char *str, int last)
446			{
447			HistEvent he;
448			const char *s = str;
449			int relative = 0;
450			int i, retval;
451
452			retval = history(hist, &he, H_FIRST);
453			switch (*s) {
454			case '-':
455			relative = 1;
456			/FALLTHROUGH/
457			case '+':
458			s++;
459			}
460			if (is_number(s)) {
461			i = atoi(s);
462			if (relative) {
463			while (retval != -1 && i--) {
464			retval = history(hist, &he, H_NEXT);
465			}
466			if (retval == -1)
467			retval = history(hist, &he, H_LAST);
468			} else {
469			retval = history(hist, &he, H_NEXT_EVENT, i);
470			if (retval == -1) {
471			/*
472			* the notion of first and last is
473			* backwards to that of the history package
474			*/
475			retval = history(hist, &he,
476			last ? H_FIRST : H_LAST);
477			}
478			}
479			if (retval == -1)
480			sh_error("history number %s not found (internal error)",
481			str);
482			} else {
483			/*
484			* pattern
485			*/
486			retval = history(hist, &he, H_PREV_STR, str);
487			if (retval == -1)
488			sh_error("history pattern not found: %s", str);
489			}
490			return (he.num);
491			}
492			#endif