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exec.c

Last change on this file was 3568, checked in by bird, 3 years ago
kash: Corrected has_ext for when suffix is set via the suffix index in shellexec. Removed bogus assertion from tryexec.
Property svn:eol-style set to `LF` Property svn:keywords set to `Id`
File size: 31.9 KB

Rev	Line
[626]	1	/* $NetBSD: exec.c,v 1.37 2003/08/07 09:05:31 agc Exp $ */
	2
	3	/*-
	4	* Copyright (c) 1991, 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. 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
[1214]	35	#if 0
[626]	36	#ifndef lint
	37	static char sccsid[] = "@(#)exec.c 8.4 (Berkeley) 6/8/95";
	38	#else
	39	__RCSID("$NetBSD: exec.c,v 1.37 2003/08/07 09:05:31 agc Exp $");
[1214]	40	#endif /* not lint */
[626]	41	#endif
	42
	43	#include <sys/types.h>
	44	#include <errno.h>
	45	#include <stdio.h>
	46	#include <stdlib.h>
[3438]	47	#include <stddef.h>
[626]	48
	49	/*
	50	* When commands are first encountered, they are entered in a hash table.
	51	* This ensures that a full path search will not have to be done for them
	52	* on each invocation.
	53	*
	54	* We should investigate converting to a linear search, even though that
	55	* would make the command name "hash" a misnomer.
	56	*/
	57
	58	#include "shell.h"
	59	#include "main.h"
	60	#include "nodes.h"
	61	#include "parser.h"
	62	#include "redir.h"
	63	#include "eval.h"
	64	#include "exec.h"
	65	#include "builtins.h"
	66	#include "var.h"
	67	#include "options.h"
	68	#include "input.h"
	69	#include "output.h"
	70	#include "syntax.h"
	71	#include "memalloc.h"
	72	#include "error.h"
	73	#include "init.h"
	74	#include "mystring.h"
	75	#include "show.h"
	76	#include "jobs.h"
	77	#include "alias.h"
	78	#ifdef __INNOTEK_LIBC__
	79	#include <InnoTekLIBC/backend.h>
	80	#endif
[1203]	81	#include "shinstance.h"
[626]	82
[1203]	83	//#define CMDTABLESIZE 31 /* should be prime */
	84	//#define ARB 1 /* actual size determined at run time */
	85	//
	86	//
	87	//
	88	//struct tblentry {
	89	// struct tblentry next; / next entry in hash chain */
	90	// union param param; /* definition of builtin function */
	91	// short cmdtype; /* index identifying command */
	92	// char rehash; /* if set, cd done since entry created */
	93	// char cmdname[ARB]; /* name of command */
	94	//};
	95	//
	96	//
	97	//STATIC struct tblentry *cmdtable[CMDTABLESIZE];
	98	//STATIC int builtinloc = -1; /* index in path of %builtin, or -1 */
	99	//int exerrno = 0; /* Last exec error */
[3475]	100	#ifdef PC_EXE_EXTS
	101	STATIC const char * const g_exe_suffixes[] = { "", ".exe", ".cmd", ".btm", ".com" };
	102	#endif
[626]	103
	104
[3435]	105	STATIC void tryexec(shinstance , char , char , char , int);
[1203]	106	STATIC void execinterp(shinstance , char , char *);
	107	STATIC void printentry(shinstance , struct tblentry , int);
	108	STATIC void clearcmdentry(shinstance *, int);
	109	STATIC struct tblentry cmdlookup(shinstance , const char *, int);
	110	STATIC void delete_cmd_entry(shinstance *);
[626]	111	#ifdef PC_EXE_EXTS
[3475]	112	STATIC int stat_pc_exec_exts(shinstance , char fullname, int has_ext, int *suffixp);
[626]	113	#endif
	114
	115
	116	extern char *const parsekwd[];
	117
[3438]	118	#ifndef SH_FORKED_MODE
	119	void
	120	subshellinitexec(shinstance psh, shinstance inherit)
	121	{
	122	unsigned i;
	123	for (i = 0; i < K_ELEMENTS(inherit->cmdtable); i++) {
	124	struct tblentry const *csrc = inherit->cmdtable[i];
	125	if (!csrc) {
	126	} else {
	127	struct tblentry **ppdst = &psh->cmdtable[i];
	128	do
	129	{
	130	size_t const namesize = strlen(csrc->cmdname) + 1;
	131	size_t const entrysize = offsetof(struct tblentry, cmdname) + namesize;
	132	struct tblentry dst = (struct tblentry )ckmalloc(psh, entrysize);
	133	memcpy(dst->cmdname, csrc->cmdname, namesize);
	134	dst->rehash = csrc->rehash;
	135	dst->cmdtype = csrc->cmdtype;
	136
	137	dst->param.func = NULL;
	138	switch (csrc->cmdtype) {
	139	case CMDUNKNOWN:
	140	case CMDNORMAL:
[3475]	141	dst->param.n.index = csrc->param.n.index;
	142	dst->param.n.suffix = csrc->param.n.suffix;
[3438]	143	break;
	144	case CMDFUNCTION:
	145	dst->param.func = copyfunc(psh, csrc->param.func); /** @todo optimize function allocations */
	146	break;
	147	case CMDBUILTIN:
	148	case CMDSPLBLTIN:
	149	dst->param.bltin = csrc->param.bltin;
	150	break;
	151	}
	152
	153	*ppdst = dst;
	154	ppdst = &dst->next;
	155
	156	csrc = csrc->next;
	157	} while (csrc);
	158	*ppdst = NULL;
	159	}
	160	}
	161
	162	psh->builtinloc = inherit->builtinloc;
	163	}
	164	#endif /* SH_FORKED_MODE */
	165
	166
[626]	167	/*
[3475]	168	* Check if 'path' is an absolute (starts with root) path or not.
	169	*/
[3480]	170	K_INLINE int isabspath(const char *path)
[3475]	171	{
	172	#if K_OS == K_OS_WINDOWS \|\| K_OS == K_OS_OS2
	173	if (path[0] == '/' \|\| path[0] == '\\') {
	174	if ( (path[1] == '/' \|\| path[1] == '\\')
	175	&& (path[2] != '/' && path[2] != '\\' && path[2]))
	176	return 1;
	177	} else if (path[0] && path[1] == ':' && (path[2] == '\\' \|\| path[2] == '/') && isalpha(path[0])) {
	178	return 1;
	179	}
	180	return 0;
	181	#else
	182	return path[0] == '/';
	183	#endif
	184	}
	185
	186	/*
	187	* Checks if the filename include a path or not.
	188	*/
[3480]	189	K_INLINE int haspath(const char *name)
[3475]	190	{
	191	#if K_OS == K_OS_WINDOWS \|\| K_OS == K_OS_OS2
	192	return strchr(name, '/') != NULL
	193	\|\| strchr(name, '\\') != NULL
	194	\|\| (name[0] && name[1] == ':');
	195	#else
	196	return strchr(name, '/') != NULL;
	197	#endif
	198	}
	199
	200
	201	/*
[626]	202	* Exec a program. Never returns. If you change this routine, you may
	203	* have to change the find_command routine as well.
	204	*/
	205
[2298]	206	SH_NORETURN_1 void
[3475]	207	shellexec(shinstance psh, char argv, char envp, const char path, int idx, int suffix)
[626]	208	{
	209	char *cmdname;
	210	int e;
[3057]	211	const char *argv0 = argv[0];
	212	int argv0len = (int)strlen(argv0);
	213	char kmkcmd[48];
[626]	214	#ifdef PC_EXE_EXTS
[3057]	215	int has_ext = argv0len - 4;
[626]	216	has_ext = has_ext > 0
[3057]	217	&& argv0[has_ext] == '.'
[626]	218	/* use strstr and upper/lower permuated extensions to avoid multiple strcasecmp calls. */
	219	&& strstr("exe;" "Exe;" "EXe;" "EXE;" "ExE;" "eXe;" "eXE;" "exE;"
	220	"cmd;" "Cmd;" "CMd;" "CMD;" "CmD;" "cMd;" "cMD;" "cmD;"
	221	"com;" "Com;" "COm;" "COM;" "CoM;" "cOm;" "cOM;" "coM;"
	222	"bat;" "Bat;" "BAt;" "BAT;" "BaT;" "bAt;" "bAT;" "baT;"
	223	"btm;" "Btm;" "BTm;" "BTM;" "BtM;" "bTm;" "bTM;" "btM;",
[3057]	224	argv0 + has_ext + 1)
[626]	225	!= NULL;
	226	#else
	227	const int has_ext = 1;
	228	#endif
[3475]	229	TRACE((psh, "shellexec: argv[0]=%s idx=%d suffix=%d\n", argv0, idx, suffix));
	230	if (haspath(argv0)) {
	231	#ifdef PC_EXE_EXTS
	232	if (!has_ext && suffix && (unsigned)suffix < K_ELEMENTS(g_exe_suffixes)) {
	233	size_t sufflen = strlen(g_exe_suffixes[suffix]);
	234	cmdname = stalloc(psh, argv0len + sufflen + 1);
	235	memcpy(cmdname, argv0, argv0len);
	236	memcpy(cmdname + argv0len, g_exe_suffixes[suffix], sufflen + 1);
[3568]	237	tryexec(psh, cmdname, argv, envp, 1);
[3475]	238	} else
	239	#endif
	240	{
	241	cmdname = stalloc(psh, argv0len + 5);
	242	memcpy(cmdname, argv0, argv0len + 1);
[3568]	243	tryexec(psh, cmdname, argv, envp, has_ext);
[3475]	244	}
[1199]	245	TRACE((psh, "shellexec: cmdname=%s\n", cmdname));
[1198]	246	stunalloc(psh, cmdname);
[626]	247	e = errno;
	248	} else {
[3057]	249	/* Before we search the PATH, transform kmk_builtin_% to kmk_% so we don't
[3437]	250	need to be too careful mixing internal and external kmk commands. */
[3057]	251	if ( argv0len > 12
	252	&& argv0len < 42
	253	&& strncmp(argv0, "kmk_builtin_", 12) == 0
	254	&& strpbrk(argv0 + 12, "./\\-:;<>") == NULL) {
	255	memcpy(kmkcmd, "kmk_", 4);
	256	memcpy(&kmkcmd[4], argv0 + 12, argv0len + 1 - 8);
	257	TRACE((psh, "shellexec: dropped '_builtin' from %s to %s\n", argv0, kmkcmd));
	258	argv0len -= 8;
	259	argv0 = kmkcmd;
	260	}
	261
[626]	262	e = ENOENT;
[3057]	263	while ((cmdname = padvance(psh, &path, argv0)) != NULL) {
[1203]	264	if (--idx < 0 && psh->pathopt == NULL) {
[3475]	265	#ifdef PC_EXE_EXTS
[3568]	266	if (!has_ext && idx == -1 && suffix && (unsigned)suffix < K_ELEMENTS(g_exe_suffixes)) {
[3475]	267	strcat(cmdname, g_exe_suffixes[suffix]);
[3568]	268	tryexec(psh, cmdname, argv, envp, 1);
	269	} else
[3475]	270	#endif
[3568]	271	tryexec(psh, cmdname, argv, envp, has_ext);
[626]	272	if (errno != ENOENT && errno != ENOTDIR)
	273	e = errno;
	274	}
[1198]	275	stunalloc(psh, cmdname);
[626]	276	}
	277	}
	278
	279	/* Map to POSIX errors */
	280	switch (e) {
	281	case EACCES:
[1203]	282	psh->exerrno = 126;
[626]	283	break;
	284	case ENOENT:
[1203]	285	psh->exerrno = 127;
[626]	286	break;
	287	default:
[1203]	288	psh->exerrno = 2;
[626]	289	break;
	290	}
[3435]	291	TRACE((psh, "shellexec failed for '%s', errno %d, suppressint %d\n",
	292	argv[0], e, psh->suppressint ));
[1199]	293	exerror(psh, EXEXEC, "%s: %s", argv[0], errmsg(psh, e, E_EXEC));
[626]	294	/* NOTREACHED */
	295	}
	296
	297
	298	STATIC void
[3435]	299	tryexec(shinstance psh, char cmd, char argv, char envp, int has_ext)
[626]	300	{
	301	int e;
	302	#ifdef EXEC_HASH_BANG_SCRIPT
	303	char *p;
	304	#endif
	305	#ifdef PC_EXE_EXTS
	306	/* exploit the effect of stat_pc_exec_exts which adds the
[3475]	307	* correct extentions to the file. */
	308	if (!has_ext) {
	309	int suffix;
[3568]	310	stat_pc_exec_exts(psh, cmd, 0, &suffix);
[3475]	311	}
[626]	312	#endif
[1214]	313	#if defined(__INNOTEK_LIBC__) && defined(EXEC_HASH_BANG_SCRIPT)
[626]	314	__libc_Back_gfProcessHandleHashBangScripts = 0;
	315	#endif
	316
	317	#ifdef SYSV
	318	do {
[1203]	319	sh_execve(psh, cmd, argv, envp);
[626]	320	} while (errno == EINTR);
	321	#else
[1216]	322	sh_execve(psh, cmd, (const char * const)argv, (const char const*)envp);
[626]	323	#endif
	324	e = errno;
	325	if (e == ENOEXEC) {
[1201]	326	initshellproc(psh);
	327	setinputfile(psh, cmd, 0);
[3438]	328	if (psh->commandnamemalloc) {
	329	sh_free(psh, psh->commandname);
	330	psh->commandnamemalloc = 0;
	331	}
	332	if (psh->arg0malloc)
	333	sh_free(psh, psh->arg0);
[2290]	334	psh->commandname = psh->arg0 = savestr(psh, argv[0]);
[3438]	335	psh->arg0malloc = 1;
[626]	336	#ifdef EXEC_HASH_BANG_SCRIPT
[1201]	337	pgetc(psh); pungetc(psh); /* fill up input buffer */
[1203]	338	p = psh->parsenextc;
	339	if (psh->parsenleft > 2 && p[0] == '#' && p[1] == '!') {
[626]	340	argv[0] = cmd;
[1203]	341	execinterp(psh, argv, envp);
[626]	342	}
	343	#endif
[1202]	344	setparam(psh, argv + 1);
[1199]	345	exraise(psh, EXSHELLPROC);
[626]	346	}
	347	errno = e;
	348	}
	349
[2649]	350	#ifdef EXEC_HASH_BANG_SCRIPT
[626]	351
	352	/*
[2649]	353	* Checks if NAME is the (base) name of the shell executable or something
	354	* very similar.
	355	*/
	356	STATIC int
	357	is_shell_exe_name(const char *name)
	358	{
	359	return equal(name, "kmk_ash")
	360	\|\| equal(name, "kmk_sh")
	361	\|\| equal(name, "kash")
	362	\|\| equal(name, "sh");
	363	}
	364
	365	/*
[626]	366	* Execute an interpreter introduced by "#!", for systems where this
	367	* feature has not been built into the kernel. If the interpreter is
	368	* the shell, return (effectively ignoring the "#!"). If the execution
	369	* of the interpreter fails, exit.
	370	*
	371	* This code peeks inside the input buffer in order to avoid actually
	372	* reading any input. It would benefit from a rewrite.
	373	*/
	374
[2642]	375	#define NEWARGS 16
[626]	376
	377	STATIC void
[1203]	378	execinterp(shinstance psh, char argv, char *envp)
[626]	379	{
	380	int n;
	381	char *inp;
	382	char *outp;
	383	char c;
	384	char *p;
	385	char **ap;
	386	char *newargs[NEWARGS];
[2652]	387	intptr_t i;
[626]	388	char **ap2;
	389	char **new;
	390
[2652]	391	/* Split the string into arguments. */
[1203]	392	n = psh->parsenleft - 2;
	393	inp = psh->parsenextc + 2;
[626]	394	ap = newargs;
	395	for (;;) {
	396	while (--n >= 0 && (inp == ' ' \|\| inp == '\t'))
	397	inp++;
	398	if (n < 0)
	399	goto bad;
	400	if ((c = *inp++) == '\n')
	401	break;
	402	if (ap == &newargs[NEWARGS])
[1199]	403	bad: error(psh, "Bad #! line");
[1198]	404	STARTSTACKSTR(psh, outp);
[626]	405	do {
[1198]	406	STPUTC(psh, c, outp);
[626]	407	} while (--n >= 0 && (c = *inp++) != ' ' && c != '\t' && c != '\n');
[1198]	408	STPUTC(psh, '\0', outp);
[626]	409	n++, inp--;
[1198]	410	*ap++ = grabstackstr(psh, outp);
[626]	411	}
[2642]	412
[2652]	413	/* /usr/bin/env emulation, very common with kash/kmk_ash. */
[2649]	414	i = ap - newargs;
[2652]	415	if (i > 1 && equal(newargs[0], "/usr/bin/env")) {
	416	if ( !strchr(newargs[1], '=')
	417	&& newargs[1][0] != '-') {
	418	/* shellexec below searches the PATH for us, so just
	419	drop /usr/bin/env. */
	420	TRACE((psh, "hash bang /usr/bin/env utility, dropping /usr/bin/env\n"));
	421	ap--;
	422	i--;
	423	for (n = 0; n < i; n++)
	424	newargs[n] = newargs[n + 1];
	425	} /* else: complicated invocation */
	426	}
[2649]	427
[2652]	428	/* If the interpreter is the shell or a similar shell, there is
	429	no need to exec. */
	430	if (i == 1) {
[2642]	431	p = strrchr(newargs[0], '/');
	432	if (!p)
	433	p = newargs[0];
[2649]	434	if (is_shell_exe_name(p)) {
[2642]	435	TRACE((psh, "hash bang self\n"));
	436	return;
[626]	437	}
	438	}
[2642]	439
[2652]	440	/* Combine the two argument lists and exec. */
[626]	441	i = (char )ap - (char )newargs; /* size in bytes */
	442	if (i == 0)
[1199]	443	error(psh, "Bad #! line");
[626]	444	for (ap2 = argv ; *ap2++ != NULL ; );
[2290]	445	new = ckmalloc(psh, i + ((char )ap2 - (char )argv));
[626]	446	ap = newargs, ap2 = new;
	447	while ((i -= sizeof (char **)) >= 0)
	448	ap2++ = ap++;
	449	ap = argv;
[2649]	450	while ((ap2++ = ap++))
	451	/* nothing*/;
[1199]	452	TRACE((psh, "hash bang '%s'\n", new[0]));
[3475]	453	shellexec(psh, new, envp, pathval(psh), 0, -1);
[626]	454	/* NOTREACHED */
	455	}
	456
[2649]	457	#endif /* EXEC_HASH_BANG_SCRIPT */
[626]	458
	459
	460	/*
	461	* Do a path search. The variable path (passed by reference) should be
	462	* set to the start of the path before the first call; padvance will update
	463	* this value as it proceeds. Successive calls to padvance will return
	464	* the possible path expansions in sequence. If an option (indicated by
	465	* a percent sign) appears in the path entry then the global variable
[1203]	466	* psh->pathopt will be set to point to it; otherwise psh->pathopt will be set to
[626]	467	* NULL.
	468	*/
	469
[1203]	470	//const char *pathopt;
[626]	471
	472	char *
[1203]	473	padvance(shinstance psh, const char path, const char name)
[626]	474	{
	475	const char *p;
	476	char *q;
	477	const char *start;
	478	int len;
	479
	480	if (*path == NULL)
	481	return NULL;
	482	start = *path;
	483	#ifdef PC_PATH_SEP
	484	for (p = start ; p && p != ';' && *p != '%' ; p++);
	485	#else
	486	for (p = start ; p && p != ':' && *p != '%' ; p++);
	487	#endif
[1203]	488	len = (int)(p - start + strlen(name) + 2); /* "2" is for '/' and '\0' */
[626]	489	#ifdef PC_EXE_EXTS
	490	len += 4; /* "4" is for .exe/.com/.cmd/.bat/.btm */
	491	#endif
[1198]	492	while (stackblocksize(psh) < len)
	493	growstackblock(psh);
	494	q = stackblock(psh);
[626]	495	if (p != start) {
	496	memcpy(q, start, p - start);
	497	q += p - start;
	498	*q++ = '/';
	499	}
	500	strcpy(q, name);
[1203]	501	psh->pathopt = NULL;
[626]	502	if (*p == '%') {
[1203]	503	psh->pathopt = ++p;
[626]	504	#ifdef PC_PATH_SEP
	505	while (p && p != ';') p++;
	506	#else
	507	while (p && p != ':') p++;
	508	#endif
	509	}
	510	#ifdef PC_PATH_SEP
	511	if (*p == ';')
	512	#else
	513	if (*p == ':')
	514	#endif
	515	*path = p + 1;
	516	else
	517	*path = NULL;
[1198]	518	return stalloc(psh, len);
[626]	519	}
	520
	521
	522	#ifdef PC_EXE_EXTS
[3475]	523	STATIC int stat_pc_exec_exts(shinstance psh, char fullname, int has_ext, int *suffixp)
[626]	524	{
[3475]	525	int isreg;
	526
[626]	527	/* skip the SYSV crap */
[3475]	528	if ((isreg = shfile_stat_isreg(&psh->fdtab, fullname)) >= 1) {
	529	*suffixp = 0;
	530	return isreg;
	531	}
[626]	532	if (!has_ext && errno == ENOENT)
	533	{
[3475]	534	/* Ignore non-regular files here. */
[626]	535	char *psz = strchr(fullname, '\0');
[3475]	536	int i;
	537	for (i = 1 /first entry is empty/; i < K_ELEMENTS(g_exe_suffixes); i++) {
	538	strcpy(psz, g_exe_suffixes[i]);
	539	if ((isreg = shfile_stat_isreg(&psh->fdtab, fullname)) >= 1) {
	540	*suffixp = i;
	541	return isreg;
	542	}
	543	if (isreg < 0 && errno != ENOENT && errno != ENOTDIR)
	544	break;
	545	}
[626]	546	}
[3475]	547	*suffixp = -1;
	548	return isreg;
[626]	549	}
	550	#endif /* PC_EXE_EXTS */
	551
	552
	553
	554	/* Command hashing code */
	555
	556
	557	int
[1203]	558	hashcmd(shinstance psh, int argc, char *argv)
[626]	559	{
	560	struct tblentry **pp;
	561	struct tblentry *cmdp;
	562	int c;
	563	int verbose;
	564	struct cmdentry entry;
	565	char *name;
	566
	567	verbose = 0;
[1202]	568	while ((c = nextopt(psh, "rv")) != '\0') {
[626]	569	if (c == 'r') {
[1203]	570	clearcmdentry(psh, 0);
[626]	571	} else if (c == 'v') {
	572	verbose++;
	573	}
	574	}
[1203]	575	if (*psh->argptr == NULL) {
	576	for (pp = psh->cmdtable ; pp < &psh->cmdtable[CMDTABLESIZE] ; pp++) {
[626]	577	for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
	578	if (verbose \|\| cmdp->cmdtype == CMDNORMAL)
[1203]	579	printentry(psh, cmdp, verbose);
[626]	580	}
	581	}
	582	return 0;
	583	}
[1203]	584	while ((name = *psh->argptr) != NULL) {
	585	if ((cmdp = cmdlookup(psh, name, 0)) != NULL
[626]	586	&& (cmdp->cmdtype == CMDNORMAL
[1203]	587	\|\| (cmdp->cmdtype == CMDBUILTIN && psh->builtinloc >= 0)))
	588	delete_cmd_entry(psh);
	589	find_command(psh, name, &entry, DO_ERR, pathval(psh));
[626]	590	if (verbose) {
	591	if (entry.cmdtype != CMDUNKNOWN) { /* if no error msg */
[1203]	592	cmdp = cmdlookup(psh, name, 0);
	593	printentry(psh, cmdp, verbose);
[626]	594	}
[1199]	595	output_flushall(psh);
[626]	596	}
[1203]	597	psh->argptr++;
[626]	598	}
	599	return 0;
	600	}
	601
	602
	603	STATIC void
[1203]	604	printentry(shinstance psh, struct tblentry cmdp, int verbose)
[626]	605	{
	606	int idx;
	607	const char *path;
	608	char *name;
	609
	610	switch (cmdp->cmdtype) {
	611	case CMDNORMAL:
[3475]	612	idx = cmdp->param.n.index;
[1203]	613	path = pathval(psh);
[626]	614	do {
[1200]	615	name = padvance(psh, &path, cmdp->cmdname);
[1198]	616	stunalloc(psh, name);
[626]	617	} while (--idx >= 0);
[1199]	618	out1str(psh, name);
[3475]	619	#ifdef PC_EXE_EXTS
	620	if ((unsigned)cmdp->param.n.suffix < K_ELEMENTS(g_exe_suffixes))
	621	out1str(psh, g_exe_suffixes[cmdp->param.n.suffix]);
	622	#endif
[626]	623	break;
	624	case CMDSPLBLTIN:
[1199]	625	out1fmt(psh, "special builtin %s", cmdp->cmdname);
[626]	626	break;
	627	case CMDBUILTIN:
[1199]	628	out1fmt(psh, "builtin %s", cmdp->cmdname);
[626]	629	break;
	630	case CMDFUNCTION:
[1199]	631	out1fmt(psh, "function %s", cmdp->cmdname);
[626]	632	if (verbose) {
	633	struct procstat ps;
	634	INTOFF;
[1202]	635	commandtext(psh, &ps, cmdp->param.func);
[626]	636	INTON;
[1199]	637	out1str(psh, "() { ");
	638	out1str(psh, ps.cmd);
	639	out1str(psh, "; }");
[626]	640	}
	641	break;
	642	default:
[1199]	643	error(psh, "internal error: %s cmdtype %d", cmdp->cmdname, cmdp->cmdtype);
[626]	644	}
	645	if (cmdp->rehash)
[1199]	646	out1c(psh, '*');
	647	out1c(psh, '\n');
[626]	648	}
	649
	650
	651
	652	/*
	653	* Resolve a command name. If you change this routine, you may have to
	654	* change the shellexec routine as well.
	655	*/
	656
	657	void
[1203]	658	find_command(shinstance psh, char name, struct cmdentry entry, int act, const char path)
[626]	659	{
	660	struct tblentry *cmdp, loc_cmd;
	661	int idx;
	662	int prev;
	663	char *fullname;
	664	int e;
[1203]	665	int (bltin)(shinstance,int,char **);
[3057]	666	int argv0len = (int)strlen(name);
	667	char kmkcmd[48];
[626]	668	#ifdef PC_EXE_EXTS
[3057]	669	int has_ext = argv0len - 4;
[626]	670	has_ext = has_ext > 0
	671	&& name[has_ext] == '.'
	672	/* use strstr and upper/lower permuated extensions to avoid multiple strcasecmp calls. */
	673	&& strstr("exe;" "Exe;" "EXe;" "EXE;" "ExE;" "eXe;" "eXE;" "exE;"
	674	"cmd;" "Cmd;" "CMd;" "CMD;" "CmD;" "cMd;" "cMD;" "cmD;"
	675	"com;" "Com;" "COm;" "COM;" "CoM;" "cOm;" "cOM;" "coM;"
	676	"bat;" "Bat;" "BAt;" "BAT;" "BaT;" "bAt;" "bAT;" "baT;"
	677	"btm;" "Btm;" "BTm;" "BTM;" "BtM;" "bTm;" "bTM;" "btM;",
	678	name + has_ext + 1)
	679	!= NULL;
	680	#endif
	681
	682	/* If name contains a slash, don't use PATH or hash table */
[3475]	683	if (haspath(name)) {
[626]	684	if (act & DO_ABS) {
[3475]	685	while (shfile_stat_exists(&psh->fdtab, name) < 0) {
[626]	686	#ifdef SYSV
	687	if (errno == EINTR)
	688	continue;
	689	#endif
	690	if (errno != ENOENT && errno != ENOTDIR)
	691	e = errno;
	692	entry->cmdtype = CMDUNKNOWN;
[3475]	693	entry->u.n.index = -1;
	694	entry->u.n.suffix = -1;
[626]	695	return;
	696	}
	697	entry->cmdtype = CMDNORMAL;
[3475]	698	entry->u.n.index = -1;
	699	entry->u.n.suffix = -1;
[626]	700	return;
	701	}
	702	entry->cmdtype = CMDNORMAL;
[3475]	703	entry->u.n.index = 0;
	704	entry->u.n.suffix = 0;
[626]	705	return;
	706	}
	707
[1203]	708	if (path != pathval(psh))
[626]	709	act \|= DO_ALTPATH;
	710
	711	if (act & DO_ALTPATH && strstr(path, "%builtin") != NULL)
	712	act \|= DO_ALTBLTIN;
	713
	714	/* If name is in the table, check answer will be ok */
[1203]	715	if ((cmdp = cmdlookup(psh, name, 0)) != NULL) {
[626]	716	do {
	717	switch (cmdp->cmdtype) {
	718	case CMDNORMAL:
	719	if (act & DO_ALTPATH) {
	720	cmdp = NULL;
	721	continue;
	722	}
	723	break;
	724	case CMDFUNCTION:
	725	if (act & DO_NOFUNC) {
	726	cmdp = NULL;
	727	continue;
	728	}
	729	break;
	730	case CMDBUILTIN:
[1203]	731	if ((act & DO_ALTBLTIN) \|\| psh->builtinloc >= 0) {
[626]	732	cmdp = NULL;
	733	continue;
	734	}
	735	break;
	736	}
	737	/* if not invalidated by cd, we're done */
	738	if (cmdp->rehash == 0)
	739	goto success;
	740	} while (0);
	741	}
	742
	743	/* If %builtin not in path, check for builtin next */
[1203]	744	if ((act & DO_ALTPATH ? !(act & DO_ALTBLTIN) : psh->builtinloc < 0) &&
[1200]	745	(bltin = find_builtin(psh, name)) != 0)
[626]	746	goto builtin_success;
	747
	748	/* We have to search path. */
	749	prev = -1; /* where to start */
	750	if (cmdp) { /* doing a rehash */
	751	if (cmdp->cmdtype == CMDBUILTIN)
[1203]	752	prev = psh->builtinloc;
[626]	753	else
[3475]	754	prev = cmdp->param.n.index;
[626]	755	}
	756
[3057]	757	/* Before we search the PATH, transform kmk_builtin_% to kmk_% so we don't
	758	need to be too careful mixing internal and external kmk command. */
	759	if ( argv0len > 12
	760	&& argv0len < (int)sizeof(kmkcmd)
	761	&& strncmp(name, "kmk_builtin_", 12) == 0
	762	&& strpbrk(name + 12, "./\\-:;<>") == NULL) {
	763	memcpy(kmkcmd, "kmk_", 4);
	764	memcpy(&kmkcmd[4], name + 12, argv0len + 1 - 8);
	765	TRACE((psh, "find_command: dropped '_builtin' from %s to %s\n", name, kmkcmd));
	766	argv0len -= 8;
	767	name = kmkcmd;
	768	}
	769
[626]	770	e = ENOENT;
	771	idx = -1;
	772	loop:
[1200]	773	while ((fullname = padvance(psh, &path, name)) != NULL) {
[3475]	774	#ifdef PC_EXE_EXTS
	775	int suffix;
	776	#endif
	777	int isreg;
[1198]	778	stunalloc(psh, fullname);
[626]	779	idx++;
[1203]	780	if (psh->pathopt) {
	781	if (prefix("builtin", psh->pathopt)) {
[1200]	782	if ((bltin = find_builtin(psh, name)) == 0)
[626]	783	goto loop;
	784	goto builtin_success;
[1203]	785	} else if (prefix("func", psh->pathopt)) {
[626]	786	/* handled below */
	787	} else {
	788	/* ignore unimplemented options */
	789	goto loop;
	790	}
	791	}
	792	/* if rehash, don't redo absolute path names */
[3475]	793	if (idx <= prev && isabspath(fullname)) {
[626]	794	if (idx < prev)
	795	goto loop;
[1199]	796	TRACE((psh, "searchexec \"%s\": no change\n", name));
[626]	797	goto success;
	798	}
	799	#ifdef PC_EXE_EXTS
[3475]	800	while ((isreg = stat_pc_exec_exts(psh, fullname, has_ext, &suffix)) < 0) {
[626]	801	#else
[3475]	802	while ((isreg = shfile_stat_isreg(&psh->fdtab, fullname)) < 0) {
[626]	803	#endif
	804	#ifdef SYSV
	805	if (errno == EINTR)
	806	continue;
	807	#endif
	808	if (errno != ENOENT && errno != ENOTDIR)
	809	e = errno;
	810
	811	goto loop;
	812	}
	813	e = EACCES; /* if we fail, this will be the error */
[3475]	814	if (isreg < 1)
[626]	815	goto loop;
[1203]	816	if (psh->pathopt) { /* this is a %func directory */
[626]	817	if (act & DO_NOFUNC)
	818	goto loop;
[1198]	819	stalloc(psh, strlen(fullname) + 1);
[1202]	820	readcmdfile(psh, fullname);
[1203]	821	if ((cmdp = cmdlookup(psh, name, 0)) == NULL \|\|
[626]	822	cmdp->cmdtype != CMDFUNCTION)
[1199]	823	error(psh, "%s not defined in %s", name, fullname);
[1198]	824	stunalloc(psh, fullname);
[626]	825	goto success;
	826	}
	827	#ifdef notdef
	828	/* XXX this code stops root executing stuff, and is buggy
	829	if you need a group from the group list. */
[1207]	830	if (statb.st_uid == sh_geteuid(psh)) {
[626]	831	if ((statb.st_mode & 0100) == 0)
	832	goto loop;
[1207]	833	} else if (statb.st_gid == sh_getegid(psh)) {
[626]	834	if ((statb.st_mode & 010) == 0)
	835	goto loop;
	836	} else {
	837	if ((statb.st_mode & 01) == 0)
	838	goto loop;
	839	}
	840	#endif
[1199]	841	TRACE((psh, "searchexec \"%s\" returns \"%s\"\n", name, fullname));
[626]	842	INTOFF;
	843	if (act & DO_ALTPATH) {
[1198]	844	stalloc(psh, strlen(fullname) + 1);
[626]	845	cmdp = &loc_cmd;
	846	} else
[1203]	847	cmdp = cmdlookup(psh, name, 1);
[626]	848	cmdp->cmdtype = CMDNORMAL;
[3475]	849	cmdp->param.n.index = idx;
[3480]	850	#ifdef PC_EXE_EXTS
[3475]	851	cmdp->param.n.suffix = suffix;
[3480]	852	#else
	853	cmdp->param.n.suffix = 0;
	854	#endif
[626]	855	INTON;
	856	goto success;
	857	}
	858
	859	/* We failed. If there was an entry for this command, delete it */
	860	if (cmdp)
[1203]	861	delete_cmd_entry(psh);
[626]	862	if (act & DO_ERR)
[1201]	863	outfmt(psh->out2, "%s: %s\n", name, errmsg(psh, e, E_EXEC));
[626]	864	entry->cmdtype = CMDUNKNOWN;
	865	return;
	866
	867	builtin_success:
	868	INTOFF;
	869	if (act & DO_ALTPATH)
	870	cmdp = &loc_cmd;
	871	else
[1203]	872	cmdp = cmdlookup(psh, name, 1);
[626]	873	if (cmdp->cmdtype == CMDFUNCTION)
	874	/* DO_NOFUNC must have been set */
	875	cmdp = &loc_cmd;
	876	cmdp->cmdtype = CMDBUILTIN;
	877	cmdp->param.bltin = bltin;
	878	INTON;
	879	success:
	880	cmdp->rehash = 0;
	881	entry->cmdtype = cmdp->cmdtype;
	882	entry->u = cmdp->param;
	883	}
	884
	885
	886
	887	/*
	888	* Search the table of builtin commands.
	889	*/
	890
	891	int
[1203]	892	(find_builtin(shinstance psh, char name))(shinstance psh, int, char **)
[626]	893	{
	894	const struct builtincmd *bp;
	895
	896	for (bp = builtincmd ; bp->name ; bp++) {
	897	if (bp->name == name && equal(bp->name, name))
	898	return bp->builtin;
	899	}
	900	return 0;
	901	}
	902
	903	int
[1203]	904	(find_splbltin(shinstance psh, char name))(shinstance psh, int, char **)
[626]	905	{
	906	const struct builtincmd *bp;
	907
	908	for (bp = splbltincmd ; bp->name ; bp++) {
	909	if (bp->name == name && equal(bp->name, name))
	910	return bp->builtin;
	911	}
	912	return 0;
	913	}
	914
	915	/*
	916	* At shell startup put special builtins into hash table.
	917	* ensures they are executed first (see posix).
	918	* We stop functions being added with the same name
	919	* (as they are impossible to call)
	920	*/
	921
	922	void
[1203]	923	hash_special_builtins(shinstance *psh)
[626]	924	{
	925	const struct builtincmd *bp;
	926	struct tblentry *cmdp;
	927
	928	for (bp = splbltincmd ; bp->name ; bp++) {
[1203]	929	cmdp = cmdlookup(psh, bp->name, 1);
[626]	930	cmdp->cmdtype = CMDSPLBLTIN;
	931	cmdp->param.bltin = bp->builtin;
	932	}
	933	}
	934
	935
	936
	937	/*
	938	* Called when a cd is done. Marks all commands so the next time they
	939	* are executed they will be rehashed.
	940	*/
	941
	942	void
[1203]	943	hashcd(shinstance *psh)
[626]	944	{
	945	struct tblentry **pp;
	946	struct tblentry *cmdp;
	947
[1203]	948	for (pp = psh->cmdtable ; pp < &psh->cmdtable[CMDTABLESIZE] ; pp++) {
[626]	949	for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
	950	if (cmdp->cmdtype == CMDNORMAL
[1203]	951	\|\| (cmdp->cmdtype == CMDBUILTIN && psh->builtinloc >= 0))
[626]	952	cmdp->rehash = 1;
	953	}
	954	}
	955	}
	956
	957
	958
	959	/*
	960	* Fix command hash table when PATH changed.
	961	* Called before PATH is changed. The argument is the new value of PATH;
[1203]	962	* pathval(psh) still returns the old value at this point.
[626]	963	* Called with interrupts off.
	964	*/
	965
	966	void
[1203]	967	changepath(shinstance psh, const char newval)
[626]	968	{
	969	const char old, new;
	970	int idx;
	971	int firstchange;
	972	int bltin;
	973
[1203]	974	old = pathval(psh);
[626]	975	new = newval;
	976	firstchange = 9999; /* assume no change */
	977	idx = 0;
	978	bltin = -1;
	979	for (;;) {
	980	if (old != new) {
	981	firstchange = idx;
	982	#ifdef PC_PATH_SEP
	983	if ((old == '\0' && new == ';')
	984	\|\| (old == ';' && new == '\0'))
	985	#else
	986	if ((old == '\0' && new == ':')
	987	\|\| (old == ':' && new == '\0'))
	988	#endif
	989	firstchange++;
	990	old = new; /* ignore subsequent differences */
	991	}
	992	if (*new == '\0')
	993	break;
	994	if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
	995	bltin = idx;
	996	#ifdef PC_PATH_SEP
	997	if (*new == ';') {
	998	#else
	999	if (*new == ':') {
	1000	#endif
	1001	idx++;
	1002	}
	1003	new++, old++;
	1004	}
[1203]	1005	if (psh->builtinloc < 0 && bltin >= 0)
	1006	psh->builtinloc = bltin; /* zap builtins */
	1007	if (psh->builtinloc >= 0 && bltin < 0)
[626]	1008	firstchange = 0;
[1203]	1009	clearcmdentry(psh, firstchange);
	1010	psh->builtinloc = bltin;
[626]	1011	}
	1012
	1013
	1014	/*
	1015	* Clear out command entries. The argument specifies the first entry in
	1016	* PATH which has changed.
	1017	*/
	1018
	1019	STATIC void
[1203]	1020	clearcmdentry(shinstance *psh, int firstchange)
[626]	1021	{
	1022	struct tblentry **tblp;
	1023	struct tblentry **pp;
	1024	struct tblentry *cmdp;
	1025
	1026	INTOFF;
[1203]	1027	for (tblp = psh->cmdtable ; tblp < &psh->cmdtable[CMDTABLESIZE] ; tblp++) {
[626]	1028	pp = tblp;
	1029	while ((cmdp = *pp) != NULL) {
	1030	if ((cmdp->cmdtype == CMDNORMAL &&
[3475]	1031	cmdp->param.n.index >= firstchange)
[626]	1032	\|\| (cmdp->cmdtype == CMDBUILTIN &&
[1203]	1033	psh->builtinloc >= firstchange)) {
[626]	1034	*pp = cmdp->next;
[2290]	1035	ckfree(psh, cmdp);
[626]	1036	} else {
	1037	pp = &cmdp->next;
	1038	}
	1039	}
	1040	}
	1041	INTON;
	1042	}
	1043
	1044
	1045	/*
	1046	* Delete all functions.
	1047	*/
	1048
	1049	#ifdef mkinit
[1200]	1050	MKINIT void deletefuncs(struct shinstance *);
	1051	MKINIT void hash_special_builtins(struct shinstance *);
[626]	1052
	1053	INIT {
[1200]	1054	hash_special_builtins(psh);
[626]	1055	}
	1056
	1057	SHELLPROC {
[1200]	1058	deletefuncs(psh);
[626]	1059	}
	1060	#endif
	1061
	1062	void
[1203]	1063	deletefuncs(shinstance *psh)
[626]	1064	{
	1065	struct tblentry **tblp;
	1066	struct tblentry **pp;
	1067	struct tblentry *cmdp;
	1068
	1069	INTOFF;
[1203]	1070	for (tblp = psh->cmdtable ; tblp < &psh->cmdtable[CMDTABLESIZE] ; tblp++) {
[626]	1071	pp = tblp;
	1072	while ((cmdp = *pp) != NULL) {
	1073	if (cmdp->cmdtype == CMDFUNCTION) {
	1074	*pp = cmdp->next;
[2290]	1075	freefunc(psh, cmdp->param.func);
	1076	ckfree(psh, cmdp);
[626]	1077	} else {
	1078	pp = &cmdp->next;
	1079	}
	1080	}
	1081	}
	1082	INTON;
	1083	}
	1084
	1085
	1086
	1087	/*
	1088	* Locate a command in the command hash table. If "add" is nonzero,
	1089	* add the command to the table if it is not already present. The
	1090	* variable "lastcmdentry" is set to point to the address of the link
	1091	* pointing to the entry, so that delete_cmd_entry can delete the
	1092	* entry.
	1093	*/
	1094
	1095	struct tblentry **lastcmdentry;
	1096
	1097
	1098	STATIC struct tblentry *
[1203]	1099	cmdlookup(shinstance psh, const char name, int add)
[626]	1100	{
	1101	int hashval;
	1102	const char *p;
	1103	struct tblentry *cmdp;
	1104	struct tblentry **pp;
	1105
	1106	p = name;
	1107	hashval = *p << 4;
	1108	while (*p)
	1109	hashval += *p++;
	1110	hashval &= 0x7FFF;
[1203]	1111	pp = &psh->cmdtable[hashval % CMDTABLESIZE];
[626]	1112	for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
	1113	if (equal(cmdp->cmdname, name))
	1114	break;
	1115	pp = &cmdp->next;
	1116	}
	1117	if (add && cmdp == NULL) {
	1118	INTOFF;
[2290]	1119	cmdp = *pp = ckmalloc(psh, sizeof (struct tblentry) - ARB
[626]	1120	+ strlen(name) + 1);
	1121	cmdp->next = NULL;
	1122	cmdp->cmdtype = CMDUNKNOWN;
	1123	cmdp->rehash = 0;
[3475]	1124	cmdp->param.n.index = 0;
	1125	cmdp->param.n.suffix = 0;
[626]	1126	strcpy(cmdp->cmdname, name);
	1127	INTON;
	1128	}
	1129	lastcmdentry = pp;
	1130	return cmdp;
	1131	}
	1132
	1133	/*
	1134	* Delete the command entry returned on the last lookup.
	1135	*/
	1136
	1137	STATIC void
[1203]	1138	delete_cmd_entry(shinstance *psh)
[626]	1139	{
	1140	struct tblentry *cmdp;
	1141
	1142	INTOFF;
	1143	cmdp = *lastcmdentry;
	1144	*lastcmdentry = cmdp->next;
[2290]	1145	ckfree(psh, cmdp);
[626]	1146	INTON;
	1147	}
	1148
	1149
	1150
	1151	#ifdef notdef
	1152	void
[1203]	1153	getcmdentry(shinstance psh, char name, struct cmdentry *entry)
[626]	1154	{
[1203]	1155	struct tblentry *cmdp = cmdlookup(psh, name, 0);
[626]	1156
	1157	if (cmdp) {
	1158	entry->u = cmdp->param;
	1159	entry->cmdtype = cmdp->cmdtype;
	1160	} else {
	1161	entry->cmdtype = CMDUNKNOWN;
	1162	entry->u.index = 0;
	1163	}
	1164	}
	1165	#endif
	1166
	1167
	1168	/*
	1169	* Add a new command entry, replacing any existing command entry for
	1170	* the same name - except special builtins.
	1171	*/
	1172
	1173	STATIC void
[1203]	1174	addcmdentry(shinstance psh, char name, struct cmdentry *entry)
[626]	1175	{
	1176	struct tblentry *cmdp;
	1177
	1178	INTOFF;
[1203]	1179	cmdp = cmdlookup(psh, name, 1);
[626]	1180	if (cmdp->cmdtype != CMDSPLBLTIN) {
	1181	if (cmdp->cmdtype == CMDFUNCTION) {
[2290]	1182	freefunc(psh, cmdp->param.func);
[626]	1183	}
	1184	cmdp->cmdtype = entry->cmdtype;
	1185	cmdp->param = entry->u;
	1186	}
	1187	INTON;
	1188	}
	1189
	1190
	1191	/*
	1192	* Define a shell function.
	1193	*/
	1194
	1195	void
[2290]	1196	defun(shinstance psh, char name, union node *func)
[626]	1197	{
	1198	struct cmdentry entry;
	1199
	1200	INTOFF;
	1201	entry.cmdtype = CMDFUNCTION;
[2290]	1202	entry.u.func = copyfunc(psh, func);
[1200]	1203	addcmdentry(psh, name, &entry);
[626]	1204	INTON;
	1205	}
	1206
	1207
	1208	/*
	1209	* Delete a function if it exists.
	1210	*/
	1211
	1212	int
[1203]	1213	unsetfunc(shinstance psh, char name)
[626]	1214	{
	1215	struct tblentry *cmdp;
	1216
[1203]	1217	if ((cmdp = cmdlookup(psh, name, 0)) != NULL &&
[626]	1218	cmdp->cmdtype == CMDFUNCTION) {
[2290]	1219	freefunc(psh, cmdp->param.func);
[1203]	1220	delete_cmd_entry(psh);
[626]	1221	return (0);
	1222	}
	1223	return (1);
	1224	}
	1225
	1226	/*
	1227	* Locate and print what a word is...
	1228	* also used for 'command -[v\|V]'
	1229	*/
	1230
	1231	int
[1203]	1232	typecmd(shinstance psh, int argc, char *argv)
[626]	1233	{
	1234	struct cmdentry entry;
	1235	struct tblentry *cmdp;
	1236	char * const *pp;
	1237	struct alias *ap;
	1238	int err = 0;
	1239	char *arg;
	1240	int c;
	1241	int V_flag = 0;
	1242	int v_flag = 0;
	1243	int p_flag = 0;
	1244
[1202]	1245	while ((c = nextopt(psh, "vVp")) != 0) {
[626]	1246	switch (c) {
	1247	case 'v': v_flag = 1; break;
	1248	case 'V': V_flag = 1; break;
	1249	case 'p': p_flag = 1; break;
	1250	}
	1251	}
	1252
	1253	if (p_flag && (v_flag \|\| V_flag))
[1199]	1254	error(psh, "cannot specify -p with -v or -V");
[626]	1255
[1203]	1256	while ((arg = *psh->argptr++)) {
[626]	1257	if (!v_flag)
[1199]	1258	out1str(psh, arg);
[626]	1259	/* First look at the keywords */
	1260	for (pp = parsekwd; *pp; pp++)
	1261	if (*pp == arg && equal(*pp, arg))
	1262	break;
	1263
	1264	if (*pp) {
	1265	if (v_flag)
	1266	err = 1;
	1267	else
[1199]	1268	out1str(psh, " is a shell keyword\n");
[626]	1269	continue;
	1270	}
	1271
	1272	/* Then look at the aliases */
[1199]	1273	if ((ap = lookupalias(psh, arg, 1)) != NULL) {
[626]	1274	if (!v_flag)
[1199]	1275	out1fmt(psh, " is an alias for \n");
	1276	out1fmt(psh, "%s\n", ap->val);
[626]	1277	continue;
	1278	}
	1279
	1280	/* Then check if it is a tracked alias */
[1203]	1281	if ((cmdp = cmdlookup(psh, arg, 0)) != NULL) {
[626]	1282	entry.cmdtype = cmdp->cmdtype;
	1283	entry.u = cmdp->param;
	1284	} else {
	1285	/* Finally use brute force */
[1203]	1286	find_command(psh, arg, &entry, DO_ABS, pathval(psh));
[626]	1287	}
	1288
	1289	switch (entry.cmdtype) {
	1290	case CMDNORMAL: {
[3475]	1291	if (!haspath(arg)) {
[1203]	1292	const char *path = pathval(psh);
[626]	1293	char *name;
[3475]	1294	int j = entry.u.n.index;
[626]	1295	do {
[1200]	1296	name = padvance(psh, &path, arg);
[1198]	1297	stunalloc(psh, name);
[626]	1298	} while (--j >= 0);
	1299	if (!v_flag)
[1199]	1300	out1fmt(psh, " is%s ",
[626]	1301	cmdp ? " a tracked alias for" : "");
[3475]	1302	#ifdef PC_EXE_EXTS
	1303	if ((unsigned)entry.u.n.suffix < K_ELEMENTS(g_exe_suffixes))
	1304	out1fmt(psh, "%s%s\n", name, g_exe_suffixes[entry.u.n.suffix]);
	1305	else
	1306	#endif
	1307	out1fmt(psh, "%s\n", name);
[626]	1308	} else {
[1222]	1309	if (shfile_access(&psh->fdtab, arg, X_OK) == 0) {
[626]	1310	if (!v_flag)
[1199]	1311	out1fmt(psh, " is ");
	1312	out1fmt(psh, "%s\n", arg);
[626]	1313	} else {
	1314	if (!v_flag)
[1199]	1315	out1fmt(psh, ": %s\n",
[2648]	1316	sh_strerror(psh, errno));
[626]	1317	else
	1318	err = 126;
	1319	}
	1320	}
	1321	break;
	1322	}
	1323	case CMDFUNCTION:
	1324	if (!v_flag)
[1199]	1325	out1str(psh, " is a shell function\n");
[626]	1326	else
[1199]	1327	out1fmt(psh, "%s\n", arg);
[626]	1328	break;
	1329
	1330	case CMDBUILTIN:
	1331	if (!v_flag)
[1199]	1332	out1str(psh, " is a shell builtin\n");
[626]	1333	else
[1199]	1334	out1fmt(psh, "%s\n", arg);
[626]	1335	break;
	1336
	1337	case CMDSPLBLTIN:
	1338	if (!v_flag)
[1199]	1339	out1str(psh, " is a special shell builtin\n");
[626]	1340	else
[1199]	1341	out1fmt(psh, "%s\n", arg);
[626]	1342	break;
	1343
	1344	default:
	1345	if (!v_flag)
[1199]	1346	out1str(psh, ": not found\n");
[626]	1347	err = 127;
	1348	break;
	1349	}
	1350	}
	1351	return err;
	1352	}

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source: trunk/src/kash/exec.c

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