Initial import.

1 files changed, 899 insertions, 0 deletions

diff --git a/src/exec.c b/src/exec.c
new file mode 100644
index 0000000..1a4a9a3
--- /dev/null
+++ b/src/exec.c
@@ -0,0 +1,899 @@
+/*	$NetBSD: exec.c,v 1.35 2003/01/22 20:36:04 dsl Exp $	*/
+
+/*-
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)exec.c	8.4 (Berkeley) 6/8/95";
+#else
+__RCSID("$NetBSD: exec.c,v 1.35 2003/01/22 20:36:04 dsl Exp $");
+#endif
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sysexits.h>
+#include <paths.h>
+
+/*
+ * When commands are first encountered, they are entered in a hash table.
+ * This ensures that a full path search will not have to be done for them
+ * on each invocation.
+ *
+ * We should investigate converting to a linear search, even though that
+ * would make the command name "hash" a misnomer.
+ */
+
+#include "shell.h"
+#include "main.h"
+#include "nodes.h"
+#include "parser.h"
+#include "redir.h"
+#include "eval.h"
+#include "exec.h"
+#include "builtins.h"
+#include "var.h"
+#include "options.h"
+#include "input.h"
+#include "output.h"
+#include "syntax.h"
+#include "memalloc.h"
+#include "error.h"
+#include "init.h"
+#include "mystring.h"
+#include "show.h"
+#include "jobs.h"
+#include "alias.h"
+
+
+#define CMDTABLESIZE 31		/* should be prime */
+#define ARB 1			/* actual size determined at run time */
+
+
+
+struct tblentry {
+	struct tblentry *next;	/* next entry in hash chain */
+	union param param;	/* definition of builtin function */
+	short cmdtype;		/* index identifying command */
+	char rehash;		/* if set, cd done since entry created */
+	char cmdname[ARB];	/* name of command */
+};
+
+
+STATIC struct tblentry *cmdtable[CMDTABLESIZE];
+STATIC int builtinloc = -1;		/* index in path of %builtin, or -1 */
+int exerrno;				/* Last exec error */
+
+
+STATIC void tryexec(char *, char **, char **);
+STATIC void printentry(struct tblentry *);
+STATIC void clearcmdentry(int);
+STATIC struct tblentry *cmdlookup(const char *, int);
+STATIC void delete_cmd_entry(void);
+STATIC void addcmdentry(char *, struct cmdentry *);
+STATIC int describe_command(struct output *, char *, int);
+
+
+/*
+ * Exec a program.  Never returns.  If you change this routine, you may
+ * have to change the find_command routine as well.
+ */
+
+void
+shellexec(char **argv, const char *path, int idx)
+{
+	char *cmdname;
+	int e;
+	char **envp;
+
+	clearredir(1);
+	envp = environment();
+	if (strchr(argv[0], '/') != NULL) {
+		tryexec(argv[0], argv, envp);
+		e = errno;
+	} else {
+		e = ENOENT;
+		while ((cmdname = padvance(&path, argv[0])) != NULL) {
+			if (--idx < 0 && pathopt == NULL) {
+				tryexec(cmdname, argv, envp);
+				if (errno != ENOENT && errno != ENOTDIR)
+					e = errno;
+			}
+			stunalloc(cmdname);
+		}
+	}
+
+	/* Map to POSIX errors */
+	switch (e) {
+	case EACCES:
+		exerrno = 126;
+		break;
+	case ENOENT:
+		exerrno = 127;
+		break;
+	default:
+		exerrno = 2;
+		break;
+	}
+	TRACE(("shellexec failed for %s, errno %d, suppressint %d\n",
+		argv[0], e, suppressint ));
+	exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
+	/* NOTREACHED */
+}
+
+
+STATIC void
+tryexec(char *cmd, char **argv, char **envp)
+{
+	int repeated = 0;
+#if !defined(BSD) && !defined(linux)
+	char *p;
+#endif
+
+repeat:
+#ifdef SYSV
+	do {
+		execve(cmd, argv, envp);
+	} while (errno == EINTR);
+#else
+	execve(cmd, argv, envp);
+#endif
+	if (repeated++) {
+		ckfree(argv);
+	} else if (errno == ENOEXEC) {
+		char **ap;
+		char **new;
+
+		for (ap = argv; *ap; ap++)
+			;
+		ap = new = ckmalloc((ap - argv + 2) * sizeof(char *));
+		*ap++ = cmd = _PATH_BSHELL;
+		while ((*ap++ = *argv++))
+			;
+		argv = new;
+		goto repeat;
+	}
+}
+
+
+
+/*
+ * Do a path search.  The variable path (passed by reference) should be
+ * set to the start of the path before the first call; padvance will update
+ * this value as it proceeds.  Successive calls to padvance will return
+ * the possible path expansions in sequence.  If an option (indicated by
+ * a percent sign) appears in the path entry then the global variable
+ * pathopt will be set to point to it; otherwise pathopt will be set to
+ * NULL.
+ */
+
+const char *pathopt;
+
+char *
+padvance(const char **path, const char *name)
+{
+	const char *p;
+	char *q;
+	const char *start;
+	size_t len;
+
+	if (*path == NULL)
+		return NULL;
+	start = *path;
+	for (p = start ; *p && *p != ':' && *p != '%' ; p++);
+	len = p - start + strlen(name) + 2;	/* "2" is for '/' and '\0' */
+	while (stackblocksize() < len)
+		growstackblock();
+	q = stackblock();
+	if (p != start) {
+		memcpy(q, start, p - start);
+		q += p - start;
+		*q++ = '/';
+	}
+	strcpy(q, name);
+	pathopt = NULL;
+	if (*p == '%') {
+		pathopt = ++p;
+		while (*p && *p != ':')  p++;
+	}
+	if (*p == ':')
+		*path = p + 1;
+	else
+		*path = NULL;
+	return stalloc(len);
+}
+
+
+
+/*** Command hashing code ***/
+
+
+int
+hashcmd(int argc, char **argv)
+{
+	struct tblentry **pp;
+	struct tblentry *cmdp;
+	int c;
+	struct cmdentry entry;
+	char *name;
+
+	while ((c = nextopt("r")) != '\0') {
+		clearcmdentry(0);
+		return 0;
+	}
+	if (*argptr == NULL) {
+		for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
+			for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
+				if (cmdp->cmdtype == CMDNORMAL)
+					printentry(cmdp);
+			}
+		}
+		return 0;
+	}
+	c = 0;
+	while ((name = *argptr) != NULL) {
+		if ((cmdp = cmdlookup(name, 0)) != NULL
+		 && (cmdp->cmdtype == CMDNORMAL
+		     || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
+			delete_cmd_entry();
+		find_command(name, &entry, DO_ERR, pathval());
+		if (entry.cmdtype == CMDUNKNOWN)
+			c = 1;
+		argptr++;
+	}
+	return c;
+}
+
+
+STATIC void
+printentry(struct tblentry *cmdp)
+{
+	int idx;
+	const char *path;
+	char *name;
+
+	idx = cmdp->param.index;
+	path = pathval();
+	do {
+		name = padvance(&path, cmdp->cmdname);
+		stunalloc(name);
+	} while (--idx >= 0);
+	out1str(name);
+	out1fmt(snlfmt, cmdp->rehash ? "*" : nullstr);
+}
+
+
+
+/*
+ * Resolve a command name.  If you change this routine, you may have to
+ * change the shellexec routine as well.
+ */
+
+void
+find_command(char *name, struct cmdentry *entry, int act, const char *path)
+{
+	struct tblentry *cmdp;
+	int idx;
+	int prev;
+	char *fullname;
+	struct stat64 statb;
+	int e;
+	int updatetbl;
+	struct builtincmd *bcmd;
+
+	/* If name contains a slash, don't use PATH or hash table */
+	if (strchr(name, '/') != NULL) {
+		entry->u.index = -1;
+		if (act & DO_ABS) {
+			while (stat64(name, &statb) < 0) {
+#ifdef SYSV
+				if (errno == EINTR)
+					continue;
+#endif
+				entry->cmdtype = CMDUNKNOWN;
+				return;
+			}
+		}
+		entry->cmdtype = CMDNORMAL;
+		return;
+	}
+
+	updatetbl = (path == pathval());
+	if (!updatetbl) {
+		act |= DO_ALTPATH;
+		if (strstr(path, "%builtin") != NULL)
+			act |= DO_ALTBLTIN;
+	}
+
+	/* If name is in the table, check answer will be ok */
+	if ((cmdp = cmdlookup(name, 0)) != NULL) {
+		int bit;
+
+		switch (cmdp->cmdtype) {
+		default:
+#if DEBUG
+			abort();
+#endif
+		case CMDNORMAL:
+			bit = DO_ALTPATH;
+			break;
+		case CMDFUNCTION:
+			bit = DO_NOFUNC;
+			break;
+		case CMDBUILTIN:
+			bit = DO_ALTBLTIN;
+			break;
+		}
+		if (act & bit) {
+			updatetbl = 0;
+			cmdp = NULL;
+		} else if (cmdp->rehash == 0)
+			/* if not invalidated by cd, we're done */
+			goto success;
+	}
+
+	/* If %builtin not in path, check for builtin next */
+	bcmd = find_builtin(name);
+	if (bcmd && (bcmd->flags & BUILTIN_REGULAR || (
+		act & DO_ALTPATH ? !(act & DO_ALTBLTIN) : builtinloc <= 0
+	)))
+		goto builtin_success;
+
+	/* We have to search path. */
+	prev = -1;		/* where to start */
+	if (cmdp && cmdp->rehash) {	/* doing a rehash */
+		if (cmdp->cmdtype == CMDBUILTIN)
+			prev = builtinloc;
+		else
+			prev = cmdp->param.index;
+	}
+
+	e = ENOENT;
+	idx = -1;
+loop:
+	while ((fullname = padvance(&path, name)) != NULL) {
+		stunalloc(fullname);
+		idx++;
+		if (pathopt) {
+			if (prefix(pathopt, "builtin")) {
+				if (bcmd)
+					goto builtin_success;
+				continue;
+			} else if (!(act & DO_NOFUNC) &&
+				   prefix(pathopt, "func")) {
+				/* handled below */
+			} else {
+				/* ignore unimplemented options */
+				continue;
+			}
+		}
+		/* if rehash, don't redo absolute path names */
+		if (fullname[0] == '/' && idx <= prev) {
+			if (idx < prev)
+				continue;
+			TRACE(("searchexec \"%s\": no change\n", name));
+			goto success;
+		}
+		while (stat64(fullname, &statb) < 0) {
+#ifdef SYSV
+			if (errno == EINTR)
+				continue;
+#endif
+			if (errno != ENOENT && errno != ENOTDIR)
+				e = errno;
+			goto loop;
+		}
+		e = EACCES;	/* if we fail, this will be the error */
+		if (!S_ISREG(statb.st_mode))
+			continue;
+		if (pathopt) {		/* this is a %func directory */
+			stalloc(strlen(fullname) + 1);
+			readcmdfile(fullname);
+			if ((cmdp = cmdlookup(name, 0)) == NULL ||
+			    cmdp->cmdtype != CMDFUNCTION)
+				error("%s not defined in %s", name, fullname);
+			stunalloc(fullname);
+			goto success;
+		}
+#ifdef notdef
+		/* XXX this code stops root executing stuff, and is buggy
+		   if you need a group from the group list. */
+		if (statb.st_uid == geteuid()) {
+			if ((statb.st_mode & 0100) == 0)
+				goto loop;
+		} else if (statb.st_gid == getegid()) {
+			if ((statb.st_mode & 010) == 0)
+				goto loop;
+		} else {
+			if ((statb.st_mode & 01) == 0)
+				goto loop;
+		}
+#endif
+		TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
+		if (!updatetbl) {
+			entry->cmdtype = CMDNORMAL;
+			entry->u.index = idx;
+			return;
+		}
+		INTOFF;
+		cmdp = cmdlookup(name, 1);
+		cmdp->cmdtype = CMDNORMAL;
+		cmdp->param.index = idx;
+		INTON;
+		goto success;
+	}
+
+	/* We failed.  If there was an entry for this command, delete it */
+	if (cmdp && updatetbl)
+		delete_cmd_entry();
+	if (act & DO_ERR)
+		sh_warnx("%s: %s", name, errmsg(e, E_EXEC));
+	entry->cmdtype = CMDUNKNOWN;
+	return;
+
+builtin_success:
+	if (!updatetbl) {
+		entry->cmdtype = CMDBUILTIN;
+		entry->u.cmd = bcmd;
+		return;
+	}
+	INTOFF;
+	cmdp = cmdlookup(name, 1);
+	cmdp->cmdtype = CMDBUILTIN;
+	cmdp->param.cmd = bcmd;
+	INTON;
+success:
+	cmdp->rehash = 0;
+	entry->cmdtype = cmdp->cmdtype;
+	entry->u = cmdp->param;
+}
+
+
+
+/*
+ * Search the table of builtin commands.
+ */
+
+struct builtincmd *
+find_builtin(const char *name)
+{
+	struct builtincmd *bp;
+
+	bp = bsearch(
+		&name, builtincmd, NUMBUILTINS, sizeof(struct builtincmd),
+		pstrcmp
+	);
+	return bp;
+}
+
+
+
+/*
+ * Called when a cd is done.  Marks all commands so the next time they
+ * are executed they will be rehashed.
+ */
+
+void
+hashcd(void)
+{
+	struct tblentry **pp;
+	struct tblentry *cmdp;
+
+	for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
+		for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
+			if (cmdp->cmdtype == CMDNORMAL || (
+				cmdp->cmdtype == CMDBUILTIN &&
+				!(cmdp->param.cmd->flags & BUILTIN_REGULAR) &&
+				builtinloc > 0
+			))
+				cmdp->rehash = 1;
+		}
+	}
+}
+
+
+
+/*
+ * Fix command hash table when PATH changed.
+ * Called before PATH is changed.  The argument is the new value of PATH;
+ * pathval() still returns the old value at this point.
+ * Called with interrupts off.
+ */
+
+void
+changepath(const char *newval)
+{
+	const char *old, *new;
+	int idx;
+	int firstchange;
+	int bltin;
+
+	old = pathval();
+	new = newval;
+	firstchange = 9999;	/* assume no change */
+	idx = 0;
+	bltin = -1;
+	for (;;) {
+		if (*old != *new) {
+			firstchange = idx;
+			if ((*old == '\0' && *new == ':')
+			 || (*old == ':' && *new == '\0'))
+				firstchange++;
+			old = new;	/* ignore subsequent differences */
+		}
+		if (*new == '\0')
+			break;
+		if (*new == '%' && bltin < 0 && prefix(new + 1, "builtin"))
+			bltin = idx;
+		if (*new == ':') {
+			idx++;
+		}
+		new++, old++;
+	}
+	if (builtinloc < 0 && bltin >= 0)
+		builtinloc = bltin;		/* zap builtins */
+	if (builtinloc >= 0 && bltin < 0)
+		firstchange = 0;
+	clearcmdentry(firstchange);
+	builtinloc = bltin;
+}
+
+
+/*
+ * Clear out command entries.  The argument specifies the first entry in
+ * PATH which has changed.
+ */
+
+STATIC void
+clearcmdentry(int firstchange)
+{
+	struct tblentry **tblp;
+	struct tblentry **pp;
+	struct tblentry *cmdp;
+
+	INTOFF;
+	for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
+		pp = tblp;
+		while ((cmdp = *pp) != NULL) {
+			if ((cmdp->cmdtype == CMDNORMAL &&
+			     cmdp->param.index >= firstchange)
+			 || (cmdp->cmdtype == CMDBUILTIN &&
+			     builtinloc >= firstchange)) {
+				*pp = cmdp->next;
+				ckfree(cmdp);
+			} else {
+				pp = &cmdp->next;
+			}
+		}
+	}
+	INTON;
+}
+
+
+
+/*
+ * Locate a command in the command hash table.  If "add" is nonzero,
+ * add the command to the table if it is not already present.  The
+ * variable "lastcmdentry" is set to point to the address of the link
+ * pointing to the entry, so that delete_cmd_entry can delete the
+ * entry.
+ *
+ * Interrupts must be off if called with add != 0.
+ */
+
+struct tblentry **lastcmdentry;
+
+
+STATIC struct tblentry *
+cmdlookup(const char *name, int add)
+{
+	unsigned int hashval;
+	const char *p;
+	struct tblentry *cmdp;
+	struct tblentry **pp;
+
+	p = name;
+	hashval = (unsigned char)*p << 4;
+	while (*p)
+		hashval += (unsigned char)*p++;
+	hashval &= 0x7FFF;
+	pp = &cmdtable[hashval % CMDTABLESIZE];
+	for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
+		if (equal(cmdp->cmdname, name))
+			break;
+		pp = &cmdp->next;
+	}
+	if (add && cmdp == NULL) {
+		cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
+					+ strlen(name) + 1);
+		cmdp->next = NULL;
+		cmdp->cmdtype = CMDUNKNOWN;
+		strcpy(cmdp->cmdname, name);
+	}
+	lastcmdentry = pp;
+	return cmdp;
+}
+
+/*
+ * Delete the command entry returned on the last lookup.
+ */
+
+STATIC void
+delete_cmd_entry(void)
+{
+	struct tblentry *cmdp;
+
+	INTOFF;
+	cmdp = *lastcmdentry;
+	*lastcmdentry = cmdp->next;
+	if (cmdp->cmdtype == CMDFUNCTION)
+		freefunc(cmdp->param.func);
+	ckfree(cmdp);
+	INTON;
+}
+
+
+
+#ifdef notdef
+void
+getcmdentry(char *name, struct cmdentry *entry)
+{
+	struct tblentry *cmdp = cmdlookup(name, 0);
+
+	if (cmdp) {
+		entry->u = cmdp->param;
+		entry->cmdtype = cmdp->cmdtype;
+	} else {
+		entry->cmdtype = CMDUNKNOWN;
+		entry->u.index = 0;
+	}
+}
+#endif
+
+
+/*
+ * Add a new command entry, replacing any existing command entry for
+ * the same name - except special builtins.
+ */
+
+STATIC void
+addcmdentry(char *name, struct cmdentry *entry)
+{
+	struct tblentry *cmdp;
+
+	cmdp = cmdlookup(name, 1);
+	if (cmdp->cmdtype == CMDFUNCTION) {
+		freefunc(cmdp->param.func);
+	}
+	cmdp->cmdtype = entry->cmdtype;
+	cmdp->param = entry->u;
+	cmdp->rehash = 0;
+}
+
+
+/*
+ * Define a shell function.
+ */
+
+void
+defun(char *name, union node *func)
+{
+	struct cmdentry entry;
+
+	INTOFF;
+	entry.cmdtype = CMDFUNCTION;
+	entry.u.func = copyfunc(func);
+	addcmdentry(name, &entry);
+	INTON;
+}
+
+
+/*
+ * Delete a function if it exists.
+ */
+
+void
+unsetfunc(const char *name)
+{
+	struct tblentry *cmdp;
+
+	if ((cmdp = cmdlookup(name, 0)) != NULL &&
+	    cmdp->cmdtype == CMDFUNCTION)
+		delete_cmd_entry();
+}
+
+/*
+ * Locate and print what a word is...
+ */
+
+int
+typecmd(int argc, char **argv)
+{
+	int i;
+	int err = 0;
+
+	for (i = 1; i < argc; i++) {
+		err |= describe_command(out1, argv[i], 1);
+	}
+	return err;
+}
+
+STATIC int
+describe_command(out, command, verbose)
+	struct output *out;
+	char *command;
+	int verbose;
+{
+	struct cmdentry entry;
+	struct tblentry *cmdp;
+	const struct alias *ap;
+	const char *path = pathval();
+
+	if (verbose) {
+		outstr(command, out);
+	}
+
+	/* First look at the keywords */
+	if (findkwd(command)) {
+		outstr(verbose ? " is a shell keyword" : command, out);
+		goto out;
+	}
+
+	/* Then look at the aliases */
+	if ((ap = lookupalias(command, 0)) != NULL) {
+		if (verbose) {
+			outfmt(out, " is an alias for %s", ap->val);
+		} else {
+			outstr("alias ", out);
+			printalias(ap);
+			return 0;
+		}
+		goto out;
+	}
+
+	/* Then check if it is a tracked alias */
+	if ((cmdp = cmdlookup(command, 0)) != NULL) {
+		entry.cmdtype = cmdp->cmdtype;
+		entry.u = cmdp->param;
+	} else {
+		/* Finally use brute force */
+		find_command(command, &entry, DO_ABS, path);
+	}
+
+	switch (entry.cmdtype) {
+	case CMDNORMAL: {
+		int j = entry.u.index;
+		char *p;
+		if (j == -1) {
+			p = command;
+		} else {
+			do {
+				p = padvance(&path, command);
+				stunalloc(p);
+			} while (--j >= 0);
+		}
+		if (verbose) {
+			outfmt(
+				out, " is%s %s",
+				cmdp ? " a tracked alias for" : nullstr, p
+			);
+		} else {
+			outstr(p, out);
+		}
+		break;
+	}
+
+	case CMDFUNCTION:
+		if (verbose) {
+			outstr(" is a shell function", out);
+		} else {
+			outstr(command, out);
+		}
+		break;
+
+	case CMDBUILTIN:
+		if (verbose) {
+			outfmt(
+				out, " is a %sshell builtin",
+				entry.u.cmd->flags & BUILTIN_SPECIAL ?
+					"special " : nullstr
+			);
+		} else {
+			outstr(command, out);
+		}
+		break;
+
+	default:
+		if (verbose) {
+			outstr(": not found\n", out);
+		}
+		return 127;
+	}
+
+out:
+	outc('\n', out);
+	return 0;
+}
+
+int
+commandcmd(argc, argv)
+	int argc;
+	char **argv;
+{
+	int c;
+	int default_path = 0;
+	int verify_only = 0;
+	int verbose_verify_only = 0;
+
+	while ((c = nextopt("pvV")) != '\0')
+		switch (c) {
+		default:
+#ifdef DEBUG
+			outfmt(out2,
+"command: nextopt returned character code 0%o\n", c);
+			return EX_SOFTWARE;
+#endif
+		case 'p':
+			default_path = 1;
+			break;
+		case 'v':
+			verify_only = 1;
+			break;
+		case 'V':
+			verbose_verify_only = 1;
+			break;
+		}
+
+	if (default_path + verify_only + verbose_verify_only > 1 ||
+	    !*argptr) {
+			outfmt(out2,
+"command [-p] command [arg ...]\n");
+			outfmt(out2,
+"command {-v|-V} command\n");
+			return EX_USAGE;
+	}
+
+	if (verify_only || verbose_verify_only) {
+		return describe_command(out1, *argptr, verbose_verify_only);
+	}
+
+	return 0;
+}