Home | History | Annotate | Line # | Download | only in sh
histedit.c revision 1.30 
      1 /*	$NetBSD: histedit.c,v 1.30 2003/07/13 08:31:13 itojun Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1993
      5  *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #ifndef lint
     41 #if 0
     42 static char sccsid[] = "@(#)histedit.c	8.2 (Berkeley) 5/4/95";
     43 #else
     44 __RCSID("$NetBSD: histedit.c,v 1.30 2003/07/13 08:31:13 itojun Exp $");
     45 #endif
     46 #endif /* not lint */
     47 
     48 #include <sys/param.h>
     49 #include <paths.h>
     50 #include <stdio.h>
     51 #include <stdlib.h>
     52 #include <unistd.h>
     53 /*
     54  * Editline and history functions (and glue).
     55  */
     56 #include "shell.h"
     57 #include "parser.h"
     58 #include "var.h"
     59 #include "options.h"
     60 #include "main.h"
     61 #include "output.h"
     62 #include "mystring.h"
     63 #include "myhistedit.h"
     64 #include "error.h"
     65 #ifndef SMALL
     66 #include "eval.h"
     67 #include "memalloc.h"
     68 
     69 #define MAXHISTLOOPS	4	/* max recursions through fc */
     70 #define DEFEDITOR	"ed"	/* default editor *should* be $EDITOR */
     71 
     72 History *hist;	/* history cookie */
     73 EditLine *el;	/* editline cookie */
     74 int displayhist;
     75 static FILE *el_in, *el_out;
     76 
     77 STATIC const char *fc_replace(const char *, char *, char *);
     78 
     79 #ifdef DEBUG
     80 extern FILE *tracefile;
     81 #endif
     82 
     83 /*
     84  * Set history and editing status.  Called whenever the status may
     85  * have changed (figures out what to do).
     86  */
     87 void
     88 histedit(void)
     89 {
     90 	FILE *el_err;
     91 
     92 #define editing (Eflag || Vflag)
     93 
     94 	if (iflag) {
     95 		if (!hist) {
     96 			/*
     97 			 * turn history on
     98 			 */
     99 			INTOFF;
    100 			hist = history_init();
    101 			INTON;
    102 
    103 			if (hist != NULL)
    104 				sethistsize(histsizeval());
    105 			else
    106 				out2str("sh: can't initialize history\n");
    107 		}
    108 		if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
    109 			/*
    110 			 * turn editing on
    111 			 */
    112 			INTOFF;
    113 			if (el_in == NULL)
    114 				el_in = fdopen(0, "r");
    115 			if (el_out == NULL)
    116 				el_out = fdopen(2, "w");
    117 			if (el_in == NULL || el_out == NULL)
    118 				goto bad;
    119 			el_err = el_out;
    120 #if DEBUG
    121 			if (tracefile)
    122 				el_err = tracefile;
    123 #endif
    124 			el = el_init(arg0, el_in, el_out, el_err);
    125 			if (el != NULL) {
    126 				if (hist)
    127 					el_set(el, EL_HIST, history, hist);
    128 				el_set(el, EL_PROMPT, getprompt);
    129 			} else {
    130 bad:
    131 				out2str("sh: can't initialize editing\n");
    132 			}
    133 			INTON;
    134 		} else if (!editing && el) {
    135 			INTOFF;
    136 			el_end(el);
    137 			el = NULL;
    138 			INTON;
    139 		}
    140 		if (el) {
    141 			if (Vflag)
    142 				el_set(el, EL_EDITOR, "vi");
    143 			else if (Eflag)
    144 				el_set(el, EL_EDITOR, "emacs");
    145 			el_source(el, NULL);
    146 		}
    147 	} else {
    148 		INTOFF;
    149 		if (el) {	/* no editing if not interactive */
    150 			el_end(el);
    151 			el = NULL;
    152 		}
    153 		if (hist) {
    154 			history_end(hist);
    155 			hist = NULL;
    156 		}
    157 		INTON;
    158 	}
    159 }
    160 
    161 
    162 void
    163 sethistsize(const char *hs)
    164 {
    165 	int histsize;
    166 	HistEvent he;
    167 
    168 	if (hist != NULL) {
    169 		if (hs == NULL || *hs == '\0' ||
    170 		   (histsize = atoi(hs)) < 0)
    171 			histsize = 100;
    172 		history(hist, &he, H_SETSIZE, histsize);
    173 	}
    174 }
    175 
    176 void
    177 setterm(const char *term)
    178 {
    179 	if (el != NULL && term != NULL)
    180 		if (el_set(el, EL_TERMINAL, term) != 0) {
    181 			outfmt(out2, "sh: Can't set terminal type %s\n", term);
    182 			outfmt(out2, "sh: Using dumb terminal settings.\n");
    183 		}
    184 }
    185 
    186 int
    187 inputrc(argc, argv)
    188 	int argc;
    189 	char **argv;
    190 {
    191 	if (argc != 2) {
    192 		out2str("usage: inputrc file\n");
    193 		return 1;
    194 	}
    195 	if (el != NULL) {
    196 		if (el_source(el, argv[1])) {
    197 			out2str("inputrc: failed\n");
    198 			return 1;
    199 		} else
    200 			return 0;
    201 	} else {
    202 		out2str("sh: inputrc ignored, not editing\n");
    203 		return 1;
    204 	}
    205 }
    206 
    207 /*
    208  *  This command is provided since POSIX decided to standardize
    209  *  the Korn shell fc command.  Oh well...
    210  */
    211 int
    212 histcmd(int argc, char **argv)
    213 {
    214 	int ch;
    215 	const char *editor = NULL;
    216 	HistEvent he;
    217 	int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
    218 	int i, retval;
    219 	const char *firststr, *laststr;
    220 	int first, last, direction;
    221 	char *pat = NULL, *repl;	/* ksh "fc old=new" crap */
    222 	static int active = 0;
    223 	struct jmploc jmploc;
    224 	struct jmploc *volatile savehandler;
    225 	char editfile[MAXPATHLEN + 1];
    226 	FILE *efp;
    227 #ifdef __GNUC__
    228 	/* Avoid longjmp clobbering */
    229 	(void) &editor;
    230 	(void) &lflg;
    231 	(void) &nflg;
    232 	(void) &rflg;
    233 	(void) &sflg;
    234 	(void) &firststr;
    235 	(void) &laststr;
    236 	(void) &pat;
    237 	(void) &repl;
    238 	(void) &efp;
    239 	(void) &argc;
    240 	(void) &argv;
    241 #endif
    242 
    243 	if (hist == NULL)
    244 		error("history not active");
    245 
    246 	if (argc == 1)
    247 		error("missing history argument");
    248 
    249 	optreset = 1; optind = 1; /* initialize getopt */
    250 	while (not_fcnumber(argv[optind]) &&
    251 	      (ch = getopt(argc, argv, ":e:lnrs")) != -1)
    252 		switch ((char)ch) {
    253 		case 'e':
    254 			editor = optionarg;
    255 			break;
    256 		case 'l':
    257 			lflg = 1;
    258 			break;
    259 		case 'n':
    260 			nflg = 1;
    261 			break;
    262 		case 'r':
    263 			rflg = 1;
    264 			break;
    265 		case 's':
    266 			sflg = 1;
    267 			break;
    268 		case ':':
    269 			error("option -%c expects argument", optopt);
    270 			/* NOTREACHED */
    271 		case '?':
    272 		default:
    273 			error("unknown option: -%c", optopt);
    274 			/* NOTREACHED */
    275 		}
    276 	argc -= optind, argv += optind;
    277 
    278 	/*
    279 	 * If executing...
    280 	 */
    281 	if (lflg == 0 || editor || sflg) {
    282 		lflg = 0;	/* ignore */
    283 		editfile[0] = '\0';
    284 		/*
    285 		 * Catch interrupts to reset active counter and
    286 		 * cleanup temp files.
    287 		 */
    288 		if (setjmp(jmploc.loc)) {
    289 			active = 0;
    290 			if (*editfile)
    291 				unlink(editfile);
    292 			handler = savehandler;
    293 			longjmp(handler->loc, 1);
    294 		}
    295 		savehandler = handler;
    296 		handler = &jmploc;
    297 		if (++active > MAXHISTLOOPS) {
    298 			active = 0;
    299 			displayhist = 0;
    300 			error("called recursively too many times");
    301 		}
    302 		/*
    303 		 * Set editor.
    304 		 */
    305 		if (sflg == 0) {
    306 			if (editor == NULL &&
    307 			    (editor = bltinlookup("FCEDIT", 1)) == NULL &&
    308 			    (editor = bltinlookup("EDITOR", 1)) == NULL)
    309 				editor = DEFEDITOR;
    310 			if (editor[0] == '-' && editor[1] == '\0') {
    311 				sflg = 1;	/* no edit */
    312 				editor = NULL;
    313 			}
    314 		}
    315 	}
    316 
    317 	/*
    318 	 * If executing, parse [old=new] now
    319 	 */
    320 	if (lflg == 0 && argc > 0 &&
    321 	     ((repl = strchr(argv[0], '=')) != NULL)) {
    322 		pat = argv[0];
    323 		*repl++ = '\0';
    324 		argc--, argv++;
    325 	}
    326 	/*
    327 	 * determine [first] and [last]
    328 	 */
    329 	switch (argc) {
    330 	case 0:
    331 		firststr = lflg ? "-16" : "-1";
    332 		laststr = "-1";
    333 		break;
    334 	case 1:
    335 		firststr = argv[0];
    336 		laststr = lflg ? "-1" : argv[0];
    337 		break;
    338 	case 2:
    339 		firststr = argv[0];
    340 		laststr = argv[1];
    341 		break;
    342 	default:
    343 		error("too many args");
    344 		/* NOTREACHED */
    345 	}
    346 	/*
    347 	 * Turn into event numbers.
    348 	 */
    349 	first = str_to_event(firststr, 0);
    350 	last = str_to_event(laststr, 1);
    351 
    352 	if (rflg) {
    353 		i = last;
    354 		last = first;
    355 		first = i;
    356 	}
    357 	/*
    358 	 * XXX - this should not depend on the event numbers
    359 	 * always increasing.  Add sequence numbers or offset
    360 	 * to the history element in next (diskbased) release.
    361 	 */
    362 	direction = first < last ? H_PREV : H_NEXT;
    363 
    364 	/*
    365 	 * If editing, grab a temp file.
    366 	 */
    367 	if (editor) {
    368 		int fd;
    369 		INTOFF;		/* easier */
    370 		snprintf(editfile, sizeof(editfile), "%s_shXXXXXX", _PATH_TMP);
    371 		if ((fd = mkstemp(editfile)) < 0)
    372 			error("can't create temporary file %s", editfile);
    373 		if ((efp = fdopen(fd, "w")) == NULL) {
    374 			close(fd);
    375 			error("can't allocate stdio buffer for temp");
    376 		}
    377 	}
    378 
    379 	/*
    380 	 * Loop through selected history events.  If listing or executing,
    381 	 * do it now.  Otherwise, put into temp file and call the editor
    382 	 * after.
    383 	 *
    384 	 * The history interface needs rethinking, as the following
    385 	 * convolutions will demonstrate.
    386 	 */
    387 	history(hist, &he, H_FIRST);
    388 	retval = history(hist, &he, H_NEXT_EVENT, first);
    389 	for (;retval != -1; retval = history(hist, &he, direction)) {
    390 		if (lflg) {
    391 			if (!nflg)
    392 				out1fmt("%5d ", he.num);
    393 			out1str(he.str);
    394 		} else {
    395 			const char *s = pat ?
    396 			   fc_replace(he.str, pat, repl) : he.str;
    397 
    398 			if (sflg) {
    399 				if (displayhist) {
    400 					out2str(s);
    401 				}
    402 
    403 				evalstring(strcpy(stalloc(strlen(s) + 1), s), 0);
    404 				if (displayhist && hist) {
    405 					/*
    406 					 *  XXX what about recursive and
    407 					 *  relative histnums.
    408 					 */
    409 					history(hist, &he, H_ENTER, s);
    410 				}
    411 			} else
    412 				fputs(s, efp);
    413 		}
    414 		/*
    415 		 * At end?  (if we were to lose last, we'd sure be
    416 		 * messed up).
    417 		 */
    418 		if (he.num == last)
    419 			break;
    420 	}
    421 	if (editor) {
    422 		char *editcmd;
    423 
    424 		fclose(efp);
    425 		editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
    426 		sprintf(editcmd, "%s %s", editor, editfile);
    427 		evalstring(editcmd, 0);	/* XXX - should use no JC command */
    428 		INTON;
    429 		readcmdfile(editfile);	/* XXX - should read back - quick tst */
    430 		unlink(editfile);
    431 	}
    432 
    433 	if (lflg == 0 && active > 0)
    434 		--active;
    435 	if (displayhist)
    436 		displayhist = 0;
    437 	return 0;
    438 }
    439 
    440 STATIC const char *
    441 fc_replace(const char *s, char *p, char *r)
    442 {
    443 	char *dest;
    444 	int plen = strlen(p);
    445 
    446 	STARTSTACKSTR(dest);
    447 	while (*s) {
    448 		if (*s == *p && strncmp(s, p, plen) == 0) {
    449 			while (*r)
    450 				STPUTC(*r++, dest);
    451 			s += plen;
    452 			*p = '\0';	/* so no more matches */
    453 		} else
    454 			STPUTC(*s++, dest);
    455 	}
    456 	STACKSTRNUL(dest);
    457 	dest = grabstackstr(dest);
    458 
    459 	return (dest);
    460 }
    461 
    462 int
    463 not_fcnumber(char *s)
    464 {
    465 	if (s == NULL)
    466 		return 0;
    467         if (*s == '-')
    468                 s++;
    469 	return (!is_number(s));
    470 }
    471 
    472 int
    473 str_to_event(const char *str, int last)
    474 {
    475 	HistEvent he;
    476 	const char *s = str;
    477 	int relative = 0;
    478 	int i, retval;
    479 
    480 	retval = history(hist, &he, H_FIRST);
    481 	switch (*s) {
    482 	case '-':
    483 		relative = 1;
    484 		/*FALLTHROUGH*/
    485 	case '+':
    486 		s++;
    487 	}
    488 	if (is_number(s)) {
    489 		i = atoi(s);
    490 		if (relative) {
    491 			while (retval != -1 && i--) {
    492 				retval = history(hist, &he, H_NEXT);
    493 			}
    494 			if (retval == -1)
    495 				retval = history(hist, &he, H_LAST);
    496 		} else {
    497 			retval = history(hist, &he, H_NEXT_EVENT, i);
    498 			if (retval == -1) {
    499 				/*
    500 				 * the notion of first and last is
    501 				 * backwards to that of the history package
    502 				 */
    503 				retval = history(hist, &he,
    504 						last ? H_FIRST : H_LAST);
    505 			}
    506 		}
    507 		if (retval == -1)
    508 			error("history number %s not found (internal error)",
    509 			       str);
    510 	} else {
    511 		/*
    512 		 * pattern
    513 		 */
    514 		retval = history(hist, &he, H_PREV_STR, str);
    515 		if (retval == -1)
    516 			error("history pattern not found: %s", str);
    517 	}
    518 	return (he.num);
    519 }
    520 #else
    521 int
    522 histcmd(int argc, char **argv)
    523 {
    524 	error("not compiled with history support");
    525 	/* NOTREACHED */
    526 }
    527 int
    528 inputrc(int argc, char **argv)
    529 {
    530 	error("not compiled with history support");
    531 	/* NOTREACHED */
    532 }
    533 #endif
    534