1209 lines
29 KiB
C
1209 lines
29 KiB
C
/* $Header: /src/pub/tcsh/sh.exec.c,v 3.58 2003/03/12 19:14:51 christos Exp $ */
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/*
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* sh.exec.c: Search, find, and execute a command!
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*/
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/*-
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* Copyright (c) 1980, 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "sh.h"
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RCSID("$Id: sh.exec.c,v 3.58 2003/03/12 19:14:51 christos Exp $")
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#include "tc.h"
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#include "tw.h"
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#ifdef WINNT_NATIVE
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#include <nt.const.h>
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#endif /*WINNT_NATIVE*/
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/*
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* C shell
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*/
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#ifndef OLDHASH
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# define FASTHASH /* Fast hashing is the default */
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#endif /* OLDHASH */
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/*
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* System level search and execute of a command.
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* We look in each directory for the specified command name.
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* If the name contains a '/' then we execute only the full path name.
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* If there is no search path then we execute only full path names.
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*/
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/*
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* As we search for the command we note the first non-trivial error
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* message for presentation to the user. This allows us often
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* to show that a file has the wrong mode/no access when the file
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* is not in the last component of the search path, so we must
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* go on after first detecting the error.
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*/
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static char *exerr; /* Execution error message */
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static Char *expath; /* Path for exerr */
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/*
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* The two part hash function is designed to let texec() call the
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* more expensive hashname() only once and the simple hash() several
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* times (once for each path component checked).
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* Byte size is assumed to be 8.
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*/
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#define BITS_PER_BYTE 8
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#ifdef FASTHASH
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/*
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* xhash is an array of hash buckets which are used to hash execs. If
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* it is allocated (havhash true), then to tell if ``name'' is
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* (possibly) presend in the i'th component of the variable path, look
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* at the [hashname(name)] bucket of size [hashwidth] bytes, in the [i
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* mod size*8]'th bit. The cache size is defaults to a length of 1024
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* buckets, each 1 byte wide. This implementation guarantees that
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* objects n bytes wide will be aligned on n byte boundaries.
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*/
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# define HSHMUL 241
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static unsigned long *xhash = NULL;
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static unsigned int hashlength = 0, uhashlength = 0;
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static unsigned int hashwidth = 0, uhashwidth = 0;
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static int hashdebug = 0;
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# define hash(a, b) (((a) * HSHMUL + (b)) % (hashlength))
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# define widthof(t) (sizeof(t) * BITS_PER_BYTE)
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# define tbit(f, i, t) (((t *) xhash)[(f)] & \
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(1L << (i & (widthof(t) - 1))))
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# define tbis(f, i, t) (((t *) xhash)[(f)] |= \
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(1L << (i & (widthof(t) - 1))))
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# define cbit(f, i) tbit(f, i, unsigned char)
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# define cbis(f, i) tbis(f, i, unsigned char)
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# define sbit(f, i) tbit(f, i, unsigned short)
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# define sbis(f, i) tbis(f, i, unsigned short)
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# define ibit(f, i) tbit(f, i, unsigned int)
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# define ibis(f, i) tbis(f, i, unsigned int)
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# define lbit(f, i) tbit(f, i, unsigned long)
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# define lbis(f, i) tbis(f, i, unsigned long)
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# define bit(f, i) (hashwidth==sizeof(unsigned char) ? cbit(f,i) : \
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((hashwidth==sizeof(unsigned short) ? sbit(f,i) : \
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((hashwidth==sizeof(unsigned int) ? ibit(f,i) : \
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lbit(f,i))))))
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# define bis(f, i) (hashwidth==sizeof(unsigned char) ? cbis(f,i) : \
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((hashwidth==sizeof(unsigned short) ? sbis(f,i) : \
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((hashwidth==sizeof(unsigned int) ? ibis(f,i) : \
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lbis(f,i))))))
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#else /* OLDHASH */
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/*
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* Xhash is an array of HSHSIZ bits (HSHSIZ / 8 chars), which are used
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* to hash execs. If it is allocated (havhash true), then to tell
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* whether ``name'' is (possibly) present in the i'th component
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* of the variable path, you look at the bit in xhash indexed by
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* hash(hashname("name"), i). This is setup automatically
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* after .login is executed, and recomputed whenever ``path'' is
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* changed.
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*/
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# define HSHSIZ 8192 /* 1k bytes */
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# define HSHMASK (HSHSIZ - 1)
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# define HSHMUL 243
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static char xhash[HSHSIZ / BITS_PER_BYTE];
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# define hash(a, b) (((a) * HSHMUL + (b)) & HSHMASK)
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# define bit(h, b) ((h)[(b) >> 3] & 1 << ((b) & 7)) /* bit test */
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# define bis(h, b) ((h)[(b) >> 3] |= 1 << ((b) & 7)) /* bit set */
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#endif /* FASTHASH */
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#ifdef VFORK
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static int hits, misses;
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#endif /* VFORK */
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/* Dummy search path for just absolute search when no path */
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static Char *justabs[] = {STRNULL, 0};
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static void pexerr __P((void));
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static void texec __P((Char *, Char **));
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int hashname __P((Char *));
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static int iscommand __P((Char *));
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void
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doexec(t, do_glob)
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register struct command *t;
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bool do_glob;
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{
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Char *dp, **pv, **av, *sav;
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struct varent *v;
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bool slash;
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int hashval, i;
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Char *blk[2];
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/*
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* Glob the command name. We will search $path even if this does something,
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* as in sh but not in csh. One special case: if there is no PATH, then we
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* execute only commands which start with '/'.
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*/
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blk[0] = t->t_dcom[0];
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blk[1] = 0;
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gflag = 0;
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if (do_glob)
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tglob(blk);
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if (gflag) {
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pv = globall(blk);
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if (pv == 0) {
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setname(short2str(blk[0]));
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stderror(ERR_NAME | ERR_NOMATCH);
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}
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gargv = 0;
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}
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else
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pv = saveblk(blk);
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trim(pv);
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exerr = 0;
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expath = Strsave(pv[0]);
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#ifdef VFORK
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Vexpath = expath;
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#endif /* VFORK */
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v = adrof(STRpath);
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if (v == 0 && expath[0] != '/' && expath[0] != '.') {
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blkfree(pv);
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pexerr();
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}
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slash = any(short2str(expath), '/');
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/*
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* Glob the argument list, if necessary. Otherwise trim off the quote bits.
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*/
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gflag = 0;
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av = &t->t_dcom[1];
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if (do_glob)
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tglob(av);
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if (gflag) {
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av = globall(av);
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if (av == 0) {
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blkfree(pv);
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setname(short2str(expath));
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stderror(ERR_NAME | ERR_NOMATCH);
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}
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gargv = 0;
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}
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else
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av = saveblk(av);
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blkfree(t->t_dcom);
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t->t_dcom = blkspl(pv, av);
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xfree((ptr_t) pv);
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xfree((ptr_t) av);
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av = t->t_dcom;
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trim(av);
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if (*av == NULL || **av == '\0')
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pexerr();
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xechoit(av); /* Echo command if -x */
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#ifdef CLOSE_ON_EXEC
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/*
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* Since all internal file descriptors are set to close on exec, we don't
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* need to close them explicitly here. Just reorient ourselves for error
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* messages.
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*/
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SHIN = 0;
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SHOUT = 1;
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SHDIAG = 2;
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OLDSTD = 0;
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isoutatty = isatty(SHOUT);
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isdiagatty = isatty(SHDIAG);
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#else
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closech(); /* Close random fd's */
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#endif
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/*
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* We must do this AFTER any possible forking (like `foo` in glob) so that
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* this shell can still do subprocesses.
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*/
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#ifdef BSDSIGS
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(void) sigsetmask((sigmask_t) 0);
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#else /* BSDSIGS */
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(void) sigrelse(SIGINT);
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(void) sigrelse(SIGCHLD);
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#endif /* BSDSIGS */
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/*
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* If no path, no words in path, or a / in the filename then restrict the
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* command search.
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*/
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if (v == NULL || v->vec == NULL || v->vec[0] == NULL || slash)
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pv = justabs;
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else
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pv = v->vec;
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sav = Strspl(STRslash, *av);/* / command name for postpending */
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#ifdef VFORK
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Vsav = sav;
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#endif /* VFORK */
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hashval = havhash ? hashname(*av) : 0;
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i = 0;
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#ifdef VFORK
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hits++;
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#endif /* VFORK */
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do {
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/*
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* Try to save time by looking at the hash table for where this command
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* could be. If we are doing delayed hashing, then we put the names in
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* one at a time, as the user enters them. This is kinda like Korn
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* Shell's "tracked aliases".
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*/
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if (!slash && ABSOLUTEP(pv[0]) && havhash) {
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#ifdef FASTHASH
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if (!bit(hashval, i))
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goto cont;
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#else /* OLDHASH */
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int hashval1 = hash(hashval, i);
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if (!bit(xhash, hashval1))
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goto cont;
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#endif /* FASTHASH */
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}
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if (pv[0][0] == 0 || eq(pv[0], STRdot)) /* don't make ./xxx */
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{
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#ifdef COHERENT
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if (t->t_dflg & F_AMPERSAND) {
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# ifdef JOBDEBUG
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xprintf("set SIGINT to SIG_IGN\n");
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xprintf("set SIGQUIT to SIG_DFL\n");
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# endif /* JOBDEBUG */
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(void) signal(SIGINT,SIG_IGN); /* may not be necessary */
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(void) signal(SIGQUIT,SIG_DFL);
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}
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if (gointr && eq(gointr, STRminus)) {
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# ifdef JOBDEBUG
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xprintf("set SIGINT to SIG_IGN\n");
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xprintf("set SIGQUIT to SIG_IGN\n");
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# endif /* JOBDEBUG */
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(void) signal(SIGINT,SIG_IGN); /* may not be necessary */
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(void) signal(SIGQUIT,SIG_IGN);
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}
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#endif /* COHERENT */
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texec(*av, av);
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}
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else {
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dp = Strspl(*pv, sav);
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#ifdef VFORK
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Vdp = dp;
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#endif /* VFORK */
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#ifdef COHERENT
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if ((t->t_dflg & F_AMPERSAND)) {
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# ifdef JOBDEBUG
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xprintf("set SIGINT to SIG_IGN\n");
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# endif /* JOBDEBUG */
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/*
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* this is necessary on Coherent or all background
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* jobs are killed by CTRL-C
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* (there must be a better fix for this)
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*/
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(void) signal(SIGINT,SIG_IGN);
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}
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if (gointr && eq(gointr,STRminus)) {
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# ifdef JOBDEBUG
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xprintf("set SIGINT to SIG_IGN\n");
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xprintf("set SIGQUIT to SIG_IGN\n");
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# endif /* JOBDEBUG */
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(void) signal(SIGINT,SIG_IGN); /* may not be necessary */
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(void) signal(SIGQUIT,SIG_IGN);
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}
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#endif /* COHERENT */
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texec(dp, av);
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#ifdef VFORK
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Vdp = 0;
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#endif /* VFORK */
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xfree((ptr_t) dp);
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}
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#ifdef VFORK
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misses++;
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#endif /* VFORK */
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cont:
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pv++;
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i++;
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} while (*pv);
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#ifdef VFORK
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hits--;
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Vsav = 0;
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#endif /* VFORK */
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xfree((ptr_t) sav);
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pexerr();
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}
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static void
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pexerr()
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{
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/* Couldn't find the damn thing */
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if (expath) {
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setname(short2str(expath));
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#ifdef VFORK
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Vexpath = 0;
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#endif /* VFORK */
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xfree((ptr_t) expath);
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expath = 0;
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}
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else
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setname("");
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if (exerr)
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stderror(ERR_NAME | ERR_STRING, exerr);
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stderror(ERR_NAME | ERR_COMMAND);
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}
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|
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/*
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* Execute command f, arg list t.
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* Record error message if not found.
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* Also do shell scripts here.
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*/
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static void
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texec(sf, st)
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Char *sf;
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register Char **st;
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{
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register char **t;
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register char *f;
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register struct varent *v;
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Char **vp;
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Char *lastsh[2];
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char pref[2];
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int fd;
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Char *st0, **ost;
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/* The order for the conversions is significant */
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t = short2blk(st);
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f = short2str(sf);
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#ifdef VFORK
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Vt = t;
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#endif /* VFORK */
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errno = 0; /* don't use a previous error */
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#ifdef apollo
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/*
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* If we try to execute an nfs mounted directory on the apollo, we
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* hang forever. So until apollo fixes that..
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*/
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{
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struct stat stb;
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if (stat(f, &stb) == 0 && S_ISDIR(stb.st_mode))
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errno = EISDIR;
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}
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if (errno == 0)
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#endif /* apollo */
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{
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|
#ifdef ISC_POSIX_EXEC_BUG
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__setostype(0); /* "0" is "__OS_SYSV" in <sys/user.h> */
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|
#endif /* ISC_POSIX_EXEC_BUG */
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(void) execv(f, t);
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|
#ifdef ISC_POSIX_EXEC_BUG
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__setostype(1); /* "1" is "__OS_POSIX" in <sys/user.h> */
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#endif /* ISC_POSIX_EXEC_BUG */
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}
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#ifdef VFORK
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Vt = 0;
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|
#endif /* VFORK */
|
|
blkfree((Char **) t);
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|
switch (errno) {
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|
|
|
case ENOEXEC:
|
|
#ifdef WINNT_NATIVE
|
|
nt_feed_to_cmd(f,t);
|
|
#endif /* WINNT_NATIVE */
|
|
/*
|
|
* From: casper@fwi.uva.nl (Casper H.S. Dik) If we could not execute
|
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* it, don't feed it to the shell if it looks like a binary!
|
|
*/
|
|
if ((fd = open(f, O_RDONLY|O_LARGEFILE)) != -1) {
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|
int nread;
|
|
#ifdef O_TEXT
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|
setmode(fd, O_TEXT);
|
|
#endif
|
|
if ((nread = read(fd, (char *) pref, 2)) == 2) {
|
|
if (!Isprint(pref[0]) && (pref[0] != '\n' && pref[0] != '\t')) {
|
|
(void) close(fd);
|
|
/*
|
|
* We *know* what ENOEXEC means.
|
|
*/
|
|
stderror(ERR_ARCH, f, strerror(errno));
|
|
}
|
|
}
|
|
else if (nread < 0 && errno != EINTR) {
|
|
#ifdef convex
|
|
/* need to print error incase the file is migrated */
|
|
stderror(ERR_SYSTEM, f, strerror(errno));
|
|
#endif
|
|
}
|
|
#ifdef _PATH_BSHELL
|
|
else {
|
|
pref[0] = '#';
|
|
pref[1] = '\0';
|
|
}
|
|
#endif
|
|
}
|
|
#ifdef HASHBANG
|
|
if (fd == -1 ||
|
|
pref[0] != '#' || pref[1] != '!' || hashbang(fd, &vp) == -1) {
|
|
#endif /* HASHBANG */
|
|
/*
|
|
* If there is an alias for shell, then put the words of the alias in
|
|
* front of the argument list replacing the command name. Note no
|
|
* interpretation of the words at this point.
|
|
*/
|
|
v = adrof1(STRshell, &aliases);
|
|
if (v == NULL || v->vec == NULL) {
|
|
vp = lastsh;
|
|
vp[0] = adrof(STRshell) ? varval(STRshell) : STR_SHELLPATH;
|
|
vp[1] = NULL;
|
|
#ifdef _PATH_BSHELL
|
|
if (fd != -1
|
|
# ifndef ISC /* Compatible with ISC's /bin/csh */
|
|
&& pref[0] != '#'
|
|
# endif /* ISC */
|
|
)
|
|
vp[0] = STR_BSHELL;
|
|
#endif
|
|
vp = saveblk(vp);
|
|
}
|
|
else
|
|
vp = saveblk(v->vec);
|
|
#ifdef HASHBANG
|
|
}
|
|
#endif /* HASHBANG */
|
|
if (fd != -1)
|
|
(void) close(fd);
|
|
|
|
st0 = st[0];
|
|
st[0] = sf;
|
|
ost = st;
|
|
st = blkspl(vp, st); /* Splice up the new arglst */
|
|
ost[0] = st0;
|
|
sf = *st;
|
|
/* The order for the conversions is significant */
|
|
t = short2blk(st);
|
|
f = short2str(sf);
|
|
xfree((ptr_t) st);
|
|
blkfree((Char **) vp);
|
|
#ifdef VFORK
|
|
Vt = t;
|
|
#endif /* VFORK */
|
|
#ifdef ISC_POSIX_EXEC_BUG
|
|
__setostype(0); /* "0" is "__OS_SYSV" in <sys/user.h> */
|
|
#endif /* ISC_POSIX_EXEC_BUG */
|
|
(void) execv(f, t);
|
|
#ifdef ISC_POSIX_EXEC_BUG
|
|
__setostype(1); /* "1" is "__OS_POSIX" in <sys/user.h> */
|
|
#endif /* ISC_POSIX_EXEC_BUG */
|
|
#ifdef VFORK
|
|
Vt = 0;
|
|
#endif /* VFORK */
|
|
blkfree((Char **) t);
|
|
/* The sky is falling, the sky is falling! */
|
|
stderror(ERR_SYSTEM, f, strerror(errno));
|
|
break;
|
|
|
|
case ENOMEM:
|
|
stderror(ERR_SYSTEM, f, strerror(errno));
|
|
break;
|
|
|
|
#ifdef _IBMR2
|
|
case 0: /* execv fails and returns 0! */
|
|
#endif /* _IBMR2 */
|
|
case ENOENT:
|
|
break;
|
|
|
|
default:
|
|
if (exerr == 0) {
|
|
exerr = strerror(errno);
|
|
if (expath)
|
|
xfree((ptr_t) expath);
|
|
expath = Strsave(sf);
|
|
#ifdef VFORK
|
|
Vexpath = expath;
|
|
#endif /* VFORK */
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
void
|
|
execash(t, kp)
|
|
Char **t;
|
|
register struct command *kp;
|
|
{
|
|
int saveIN, saveOUT, saveDIAG, saveSTD;
|
|
int oSHIN;
|
|
int oSHOUT;
|
|
int oSHDIAG;
|
|
int oOLDSTD;
|
|
jmp_buf_t osetexit;
|
|
int my_reenter;
|
|
int odidfds;
|
|
#ifndef CLOSE_ON_EXEC
|
|
int odidcch;
|
|
#endif /* CLOSE_ON_EXEC */
|
|
signalfun_t osigint, osigquit, osigterm;
|
|
|
|
USE(t);
|
|
if (chkstop == 0 && setintr)
|
|
panystop(0);
|
|
/*
|
|
* Hmm, we don't really want to do that now because we might
|
|
* fail, but what is the choice
|
|
*/
|
|
rechist(NULL, adrof(STRsavehist) != NULL);
|
|
|
|
|
|
osigint = signal(SIGINT, parintr);
|
|
osigquit = signal(SIGQUIT, parintr);
|
|
osigterm = signal(SIGTERM, parterm);
|
|
|
|
odidfds = didfds;
|
|
#ifndef CLOSE_ON_EXEC
|
|
odidcch = didcch;
|
|
#endif /* CLOSE_ON_EXEC */
|
|
oSHIN = SHIN;
|
|
oSHOUT = SHOUT;
|
|
oSHDIAG = SHDIAG;
|
|
oOLDSTD = OLDSTD;
|
|
|
|
saveIN = dcopy(SHIN, -1);
|
|
saveOUT = dcopy(SHOUT, -1);
|
|
saveDIAG = dcopy(SHDIAG, -1);
|
|
saveSTD = dcopy(OLDSTD, -1);
|
|
|
|
lshift(kp->t_dcom, 1);
|
|
|
|
getexit(osetexit);
|
|
|
|
/* PWP: setjmp/longjmp bugfix for optimizing compilers */
|
|
#ifdef cray
|
|
my_reenter = 1; /* assume non-zero return val */
|
|
if (setexit() == 0) {
|
|
my_reenter = 0; /* Oh well, we were wrong */
|
|
#else /* !cray */
|
|
if ((my_reenter = setexit()) == 0) {
|
|
#endif /* cray */
|
|
SHIN = dcopy(0, -1);
|
|
SHOUT = dcopy(1, -1);
|
|
SHDIAG = dcopy(2, -1);
|
|
#ifndef CLOSE_ON_EXEC
|
|
didcch = 0;
|
|
#endif /* CLOSE_ON_EXEC */
|
|
didfds = 0;
|
|
/*
|
|
* Decrement the shell level
|
|
*/
|
|
shlvl(-1);
|
|
#ifdef WINNT_NATIVE
|
|
__nt_really_exec=1;
|
|
#endif /* WINNT_NATIVE */
|
|
doexec(kp, 1);
|
|
}
|
|
|
|
(void) sigset(SIGINT, osigint);
|
|
(void) sigset(SIGQUIT, osigquit);
|
|
(void) sigset(SIGTERM, osigterm);
|
|
|
|
doneinp = 0;
|
|
#ifndef CLOSE_ON_EXEC
|
|
didcch = odidcch;
|
|
#endif /* CLOSE_ON_EXEC */
|
|
didfds = odidfds;
|
|
(void) close(SHIN);
|
|
(void) close(SHOUT);
|
|
(void) close(SHDIAG);
|
|
(void) close(OLDSTD);
|
|
SHIN = dmove(saveIN, oSHIN);
|
|
SHOUT = dmove(saveOUT, oSHOUT);
|
|
SHDIAG = dmove(saveDIAG, oSHDIAG);
|
|
OLDSTD = dmove(saveSTD, oOLDSTD);
|
|
|
|
resexit(osetexit);
|
|
if (my_reenter)
|
|
stderror(ERR_SILENT);
|
|
}
|
|
|
|
void
|
|
xechoit(t)
|
|
Char **t;
|
|
{
|
|
if (adrof(STRecho)) {
|
|
int odidfds = didfds;
|
|
flush();
|
|
haderr = 1;
|
|
didfds = 0;
|
|
blkpr(t), xputchar('\n');
|
|
flush();
|
|
didfds = odidfds;
|
|
haderr = 0;
|
|
}
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
void
|
|
dohash(vv, c)
|
|
Char **vv;
|
|
struct command *c;
|
|
{
|
|
#ifdef COMMENT
|
|
struct stat stb;
|
|
#endif
|
|
DIR *dirp;
|
|
register struct dirent *dp;
|
|
int i = 0;
|
|
struct varent *v = adrof(STRpath);
|
|
Char **pv;
|
|
int hashval;
|
|
#ifdef WINNT_NATIVE
|
|
int is_windir; /* check if it is the windows directory */
|
|
USE(hashval);
|
|
#endif /* WINNT_NATIVE */
|
|
|
|
USE(c);
|
|
#ifdef FASTHASH
|
|
if (vv && vv[1]) {
|
|
uhashlength = atoi(short2str(vv[1]));
|
|
if (vv[2]) {
|
|
uhashwidth = atoi(short2str(vv[2]));
|
|
if ((uhashwidth != sizeof(unsigned char)) &&
|
|
(uhashwidth != sizeof(unsigned short)) &&
|
|
(uhashwidth != sizeof(unsigned long)))
|
|
uhashwidth = 0;
|
|
if (vv[3])
|
|
hashdebug = atoi(short2str(vv[3]));
|
|
}
|
|
}
|
|
|
|
if (uhashwidth)
|
|
hashwidth = uhashwidth;
|
|
else {
|
|
hashwidth = 0;
|
|
if (v == NULL)
|
|
return;
|
|
for (pv = v->vec; pv && *pv; pv++, hashwidth++)
|
|
continue;
|
|
if (hashwidth <= widthof(unsigned char))
|
|
hashwidth = sizeof(unsigned char);
|
|
else if (hashwidth <= widthof(unsigned short))
|
|
hashwidth = sizeof(unsigned short);
|
|
else if (hashwidth <= widthof(unsigned int))
|
|
hashwidth = sizeof(unsigned int);
|
|
else
|
|
hashwidth = sizeof(unsigned long);
|
|
}
|
|
|
|
if (uhashlength)
|
|
hashlength = uhashlength;
|
|
else
|
|
hashlength = hashwidth * (8*64);/* "average" files per dir in path */
|
|
|
|
if (xhash)
|
|
xfree((ptr_t) xhash);
|
|
xhash = (unsigned long *) xcalloc((size_t) (hashlength * hashwidth),
|
|
(size_t) 1);
|
|
#endif /* FASTHASH */
|
|
|
|
(void) getusername(NULL); /* flush the tilde cashe */
|
|
tw_cmd_free();
|
|
havhash = 1;
|
|
if (v == NULL)
|
|
return;
|
|
for (pv = v->vec; pv && *pv; pv++, i++) {
|
|
if (!ABSOLUTEP(pv[0]))
|
|
continue;
|
|
dirp = opendir(short2str(*pv));
|
|
if (dirp == NULL)
|
|
continue;
|
|
#ifdef COMMENT /* this isn't needed. opendir won't open
|
|
* non-dirs */
|
|
if (fstat(dirp->dd_fd, &stb) < 0 || !S_ISDIR(stb.st_mode)) {
|
|
(void) closedir(dirp);
|
|
continue;
|
|
}
|
|
#endif
|
|
#ifdef WINNT_NATIVE
|
|
is_windir = nt_check_if_windir(short2str(*pv));
|
|
#endif /* WINNT_NATIVE */
|
|
while ((dp = readdir(dirp)) != NULL) {
|
|
if (dp->d_ino == 0)
|
|
continue;
|
|
if (dp->d_name[0] == '.' &&
|
|
(dp->d_name[1] == '\0' ||
|
|
(dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
|
|
continue;
|
|
#ifdef WINNT_NATIVE
|
|
nt_check_name_and_hash(is_windir, dp->d_name, i);
|
|
#else /* !WINNT_NATIVE*/
|
|
#if defined(_UWIN) || defined(__CYGWIN__)
|
|
/* Turn foo.{exe,com,bat} into foo since UWIN's readdir returns
|
|
* the file with the .exe, .com, .bat extension
|
|
*/
|
|
{
|
|
size_t ext = strlen(dp->d_name) - 4;
|
|
if ((ext > 0) && (strcasecmp(&dp->d_name[ext], ".exe") == 0 ||
|
|
strcasecmp(&dp->d_name[ext], ".bat") == 0 ||
|
|
strcasecmp(&dp->d_name[ext], ".com") == 0))
|
|
{
|
|
dp->d_name[ext] = '\0';
|
|
#if defined(__CYGWIN__)
|
|
strlwr(dp->d_name);
|
|
#endif /* __CYGWIN__ */
|
|
}
|
|
}
|
|
#endif /* _UWIN || __CYGWIN__ */
|
|
# ifdef FASTHASH
|
|
hashval = hashname(str2short(dp->d_name));
|
|
bis(hashval, i);
|
|
if (hashdebug & 1)
|
|
xprintf(CGETS(13, 1, "hash=%-4d dir=%-2d prog=%s\n"),
|
|
hashname(str2short(dp->d_name)), i, dp->d_name);
|
|
# else /* OLD HASH */
|
|
hashval = hash(hashname(str2short(dp->d_name)), i);
|
|
bis(xhash, hashval);
|
|
# endif /* FASTHASH */
|
|
/* tw_add_comm_name (dp->d_name); */
|
|
#endif /* WINNT_NATIVE */
|
|
}
|
|
(void) closedir(dirp);
|
|
}
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
void
|
|
dounhash(v, c)
|
|
Char **v;
|
|
struct command *c;
|
|
{
|
|
USE(c);
|
|
USE(v);
|
|
havhash = 0;
|
|
#ifdef FASTHASH
|
|
if (xhash) {
|
|
xfree((ptr_t) xhash);
|
|
xhash = NULL;
|
|
}
|
|
#endif /* FASTHASH */
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
void
|
|
hashstat(v, c)
|
|
Char **v;
|
|
struct command *c;
|
|
{
|
|
USE(c);
|
|
USE(v);
|
|
#ifdef FASTHASH
|
|
if (havhash && hashlength && hashwidth)
|
|
xprintf(CGETS(13, 2, "%d hash buckets of %d bits each\n"),
|
|
hashlength, hashwidth*8);
|
|
if (hashdebug)
|
|
xprintf(CGETS(13, 3, "debug mask = 0x%08x\n"), hashdebug);
|
|
#endif /* FASTHASH */
|
|
#ifdef VFORK
|
|
if (hits + misses)
|
|
xprintf(CGETS(13, 4, "%d hits, %d misses, %d%%\n"),
|
|
hits, misses, 100 * hits / (hits + misses));
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* Hash a command name.
|
|
*/
|
|
int
|
|
hashname(cp)
|
|
register Char *cp;
|
|
{
|
|
register unsigned long h;
|
|
|
|
for (h = 0; *cp; cp++)
|
|
h = hash(h, *cp);
|
|
return ((int) h);
|
|
}
|
|
|
|
static int
|
|
iscommand(name)
|
|
Char *name;
|
|
{
|
|
register Char **pv;
|
|
register Char *sav;
|
|
register struct varent *v;
|
|
register bool slash = any(short2str(name), '/');
|
|
register int hashval, i;
|
|
|
|
v = adrof(STRpath);
|
|
if (v == NULL || v->vec == NULL || v->vec[0] == NULL || slash)
|
|
pv = justabs;
|
|
else
|
|
pv = v->vec;
|
|
sav = Strspl(STRslash, name); /* / command name for postpending */
|
|
hashval = havhash ? hashname(name) : 0;
|
|
i = 0;
|
|
do {
|
|
if (!slash && ABSOLUTEP(pv[0]) && havhash) {
|
|
#ifdef FASTHASH
|
|
if (!bit(hashval, i))
|
|
goto cont;
|
|
#else /* OLDHASH */
|
|
int hashval1 = hash(hashval, i);
|
|
if (!bit(xhash, hashval1))
|
|
goto cont;
|
|
#endif /* FASTHASH */
|
|
}
|
|
if (pv[0][0] == 0 || eq(pv[0], STRdot)) { /* don't make ./xxx */
|
|
if (executable(NULL, name, 0)) {
|
|
xfree((ptr_t) sav);
|
|
return i + 1;
|
|
}
|
|
}
|
|
else {
|
|
if (executable(*pv, sav, 0)) {
|
|
xfree((ptr_t) sav);
|
|
return i + 1;
|
|
}
|
|
}
|
|
cont:
|
|
pv++;
|
|
i++;
|
|
} while (*pv);
|
|
xfree((ptr_t) sav);
|
|
return 0;
|
|
}
|
|
|
|
/* Also by:
|
|
* Andreas Luik <luik@isaak.isa.de>
|
|
* I S A GmbH - Informationssysteme fuer computerintegrierte Automatisierung
|
|
* Azenberstr. 35
|
|
* D-7000 Stuttgart 1
|
|
* West-Germany
|
|
* is the executable() routine below and changes to iscommand().
|
|
* Thanks again!!
|
|
*/
|
|
|
|
#ifndef WINNT_NATIVE
|
|
/*
|
|
* executable() examines the pathname obtained by concatenating dir and name
|
|
* (dir may be NULL), and returns 1 either if it is executable by us, or
|
|
* if dir_ok is set and the pathname refers to a directory.
|
|
* This is a bit kludgy, but in the name of optimization...
|
|
*/
|
|
int
|
|
executable(dir, name, dir_ok)
|
|
Char *dir, *name;
|
|
bool dir_ok;
|
|
{
|
|
struct stat stbuf;
|
|
Char path[MAXPATHLEN + 1];
|
|
char *strname;
|
|
(void) memset(path, 0, sizeof(path));
|
|
|
|
if (dir && *dir) {
|
|
copyn(path, dir, MAXPATHLEN);
|
|
catn(path, name, MAXPATHLEN);
|
|
strname = short2str(path);
|
|
}
|
|
else
|
|
strname = short2str(name);
|
|
|
|
return (stat(strname, &stbuf) != -1 &&
|
|
((dir_ok && S_ISDIR(stbuf.st_mode)) ||
|
|
(S_ISREG(stbuf.st_mode) &&
|
|
/* save time by not calling access() in the hopeless case */
|
|
(stbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) &&
|
|
access(strname, X_OK) == 0
|
|
)));
|
|
}
|
|
#endif /*!WINNT_NATIVE*/
|
|
|
|
int
|
|
tellmewhat(lexp, str)
|
|
struct wordent *lexp;
|
|
Char *str;
|
|
{
|
|
register int i;
|
|
register struct biltins *bptr;
|
|
register struct wordent *sp = lexp->next;
|
|
bool aliased = 0, found;
|
|
Char *s0, *s1, *s2, *cmd;
|
|
Char qc;
|
|
|
|
if (adrof1(sp->word, &aliases)) {
|
|
alias(lexp);
|
|
sp = lexp->next;
|
|
aliased = 1;
|
|
}
|
|
|
|
s0 = sp->word; /* to get the memory freeing right... */
|
|
|
|
/* handle quoted alias hack */
|
|
if ((*(sp->word) & (QUOTE | TRIM)) == QUOTE)
|
|
(sp->word)++;
|
|
|
|
/* do quoting, if it hasn't been done */
|
|
s1 = s2 = sp->word;
|
|
while (*s2)
|
|
switch (*s2) {
|
|
case '\'':
|
|
case '"':
|
|
qc = *s2++;
|
|
while (*s2 && *s2 != qc)
|
|
*s1++ = *s2++ | QUOTE;
|
|
if (*s2)
|
|
s2++;
|
|
break;
|
|
case '\\':
|
|
if (*++s2)
|
|
*s1++ = *s2++ | QUOTE;
|
|
break;
|
|
default:
|
|
*s1++ = *s2++;
|
|
}
|
|
*s1 = '\0';
|
|
|
|
for (bptr = bfunc; bptr < &bfunc[nbfunc]; bptr++) {
|
|
if (eq(sp->word, str2short(bptr->bname))) {
|
|
if (str == NULL) {
|
|
if (aliased)
|
|
prlex(lexp);
|
|
xprintf(CGETS(13, 5, "%S: shell built-in command.\n"),
|
|
sp->word);
|
|
flush();
|
|
}
|
|
else
|
|
(void) Strcpy(str, sp->word);
|
|
sp->word = s0; /* we save and then restore this */
|
|
return TRUE;
|
|
}
|
|
}
|
|
#ifdef WINNT_NATIVE
|
|
for (bptr = nt_bfunc; bptr < &nt_bfunc[nt_nbfunc]; bptr++) {
|
|
if (eq(sp->word, str2short(bptr->bname))) {
|
|
if (str == NULL) {
|
|
if (aliased)
|
|
prlex(lexp);
|
|
xprintf(CGETS(13, 5, "%S: shell built-in command.\n"),
|
|
sp->word);
|
|
flush();
|
|
}
|
|
else
|
|
(void) Strcpy(str, sp->word);
|
|
sp->word = s0; /* we save and then restore this */
|
|
return TRUE;
|
|
}
|
|
}
|
|
#endif /* WINNT_NATIVE*/
|
|
|
|
sp->word = cmd = globone(sp->word, G_IGNORE);
|
|
|
|
if ((i = iscommand(sp->word)) != 0) {
|
|
register Char **pv;
|
|
register struct varent *v;
|
|
bool slash = any(short2str(sp->word), '/');
|
|
|
|
v = adrof(STRpath);
|
|
if (v == NULL || v->vec == NULL || v->vec[0] == NULL || slash)
|
|
pv = justabs;
|
|
else
|
|
pv = v->vec;
|
|
|
|
while (--i)
|
|
pv++;
|
|
if (pv[0][0] == 0 || eq(pv[0], STRdot)) {
|
|
if (!slash) {
|
|
sp->word = Strspl(STRdotsl, sp->word);
|
|
prlex(lexp);
|
|
xfree((ptr_t) sp->word);
|
|
}
|
|
else
|
|
prlex(lexp);
|
|
}
|
|
else {
|
|
s1 = Strspl(*pv, STRslash);
|
|
sp->word = Strspl(s1, sp->word);
|
|
xfree((ptr_t) s1);
|
|
if (str == NULL)
|
|
prlex(lexp);
|
|
else
|
|
(void) Strcpy(str, sp->word);
|
|
xfree((ptr_t) sp->word);
|
|
}
|
|
found = 1;
|
|
}
|
|
else {
|
|
if (str == NULL) {
|
|
if (aliased)
|
|
prlex(lexp);
|
|
xprintf(CGETS(13, 6, "%S: Command not found.\n"), sp->word);
|
|
flush();
|
|
}
|
|
else
|
|
(void) Strcpy(str, sp->word);
|
|
found = 0;
|
|
}
|
|
sp->word = s0; /* we save and then restore this */
|
|
xfree((ptr_t) cmd);
|
|
return found;
|
|
}
|
|
|
|
/*
|
|
* Builtin to look at and list all places a command may be defined:
|
|
* aliases, shell builtins, and the path.
|
|
*
|
|
* Marc Horowitz <marc@mit.edu>
|
|
* MIT Student Information Processing Board
|
|
*/
|
|
|
|
/*ARGSUSED*/
|
|
void
|
|
dowhere(v, c)
|
|
register Char **v;
|
|
struct command *c;
|
|
{
|
|
int found = 1;
|
|
USE(c);
|
|
for (v++; *v; v++)
|
|
found &= find_cmd(*v, 1);
|
|
/* Make status nonzero if any command is not found. */
|
|
if (!found)
|
|
set(STRstatus, Strsave(STR1), VAR_READWRITE);
|
|
}
|
|
|
|
int
|
|
find_cmd(cmd, prt)
|
|
Char *cmd;
|
|
int prt;
|
|
{
|
|
struct varent *var;
|
|
struct biltins *bptr;
|
|
Char **pv;
|
|
Char *sv;
|
|
int hashval, i, ex, rval = 0;
|
|
|
|
if (prt && any(short2str(cmd), '/')) {
|
|
xprintf(CGETS(13, 7, "where: / in command makes no sense\n"));
|
|
return rval;
|
|
}
|
|
|
|
/* first, look for an alias */
|
|
|
|
if (prt && adrof1(cmd, &aliases)) {
|
|
if ((var = adrof1(cmd, &aliases)) != NULL) {
|
|
xprintf(CGETS(13, 8, "%S is aliased to "), cmd);
|
|
if (var->vec != NULL)
|
|
blkpr(var->vec);
|
|
xputchar('\n');
|
|
rval = 1;
|
|
}
|
|
}
|
|
|
|
/* next, look for a shell builtin */
|
|
|
|
for (bptr = bfunc; bptr < &bfunc[nbfunc]; bptr++) {
|
|
if (eq(cmd, str2short(bptr->bname))) {
|
|
rval = 1;
|
|
if (prt)
|
|
xprintf(CGETS(13, 9, "%S is a shell built-in\n"), cmd);
|
|
else
|
|
return rval;
|
|
}
|
|
}
|
|
#ifdef WINNT_NATIVE
|
|
for (bptr = nt_bfunc; bptr < &nt_bfunc[nt_nbfunc]; bptr++) {
|
|
if (eq(cmd, str2short(bptr->bname))) {
|
|
rval = 1;
|
|
if (prt)
|
|
xprintf(CGETS(13, 9, "%S is a shell built-in\n"), cmd);
|
|
else
|
|
return rval;
|
|
}
|
|
}
|
|
#endif /* WINNT_NATIVE*/
|
|
|
|
/* last, look through the path for the command */
|
|
|
|
if ((var = adrof(STRpath)) == NULL)
|
|
return rval;
|
|
|
|
hashval = havhash ? hashname(cmd) : 0;
|
|
|
|
sv = Strspl(STRslash, cmd);
|
|
|
|
for (pv = var->vec, i = 0; pv && *pv; pv++, i++) {
|
|
if (havhash && !eq(*pv, STRdot)) {
|
|
#ifdef FASTHASH
|
|
if (!bit(hashval, i))
|
|
continue;
|
|
#else /* OLDHASH */
|
|
int hashval1 = hash(hashval, i);
|
|
if (!bit(xhash, hashval1))
|
|
continue;
|
|
#endif /* FASTHASH */
|
|
}
|
|
ex = executable(*pv, sv, 0);
|
|
#ifdef FASTHASH
|
|
if (!ex && (hashdebug & 2)) {
|
|
xprintf(CGETS(13, 10, "hash miss: "));
|
|
ex = 1; /* Force printing */
|
|
}
|
|
#endif /* FASTHASH */
|
|
if (ex) {
|
|
rval = 1;
|
|
if (prt) {
|
|
xprintf("%S/", *pv);
|
|
xprintf("%S\n", cmd);
|
|
}
|
|
else
|
|
return rval;
|
|
}
|
|
}
|
|
xfree((ptr_t) sv);
|
|
return rval;
|
|
}
|
|
#ifdef WINNT_NATIVE
|
|
int hashval_extern(cp)
|
|
Char *cp;
|
|
{
|
|
return havhash?hashname(cp):0;
|
|
}
|
|
int bit_extern(val,i)
|
|
int val;
|
|
int i;
|
|
{
|
|
return bit(val,i);
|
|
}
|
|
void bis_extern(val,i)
|
|
int val;
|
|
int i;
|
|
{
|
|
bis(val,i);
|
|
}
|
|
#endif /* WINNT_NATIVE */
|
|
|