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-rw-r--r--contrib/tcsh/sh.exec.c1262
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diff --git a/contrib/tcsh/sh.exec.c b/contrib/tcsh/sh.exec.c
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-/* $Header: /src/pub/tcsh/sh.exec.c,v 3.48 2000/01/14 22:57:27 christos Exp $ */
-/*
- * sh.exec.c: Search, find, and execute a command!
- */
-/*-
- * Copyright (c) 1980, 1991 The Regents of the University of California.
- * All rights reserved.
- *
- * 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 "sh.h"
-
-RCSID("$Id: sh.exec.c,v 3.48 2000/01/14 22:57:27 christos Exp $")
-
-#include "tc.h"
-#include "tw.h"
-#ifdef WINNT
-#include <nt.const.h>
-#endif /*WINNT*/
-
-/*
- * C shell
- */
-
-#ifndef OLDHASH
-# define FASTHASH /* Fast hashing is the default */
-#endif /* OLDHASH */
-
-/*
- * System level search and execute of a command.
- * We look in each directory for the specified command name.
- * If the name contains a '/' then we execute only the full path name.
- * If there is no search path then we execute only full path names.
- */
-
-/*
- * As we search for the command we note the first non-trivial error
- * message for presentation to the user. This allows us often
- * to show that a file has the wrong mode/no access when the file
- * is not in the last component of the search path, so we must
- * go on after first detecting the error.
- */
-static char *exerr; /* Execution error message */
-static Char *expath; /* Path for exerr */
-
-/*
- * The two part hash function is designed to let texec() call the
- * more expensive hashname() only once and the simple hash() several
- * times (once for each path component checked).
- * Byte size is assumed to be 8.
- */
-#define BITS_PER_BYTE 8
-
-#ifdef FASTHASH
-/*
- * xhash is an array of hash buckets which are used to hash execs. If
- * it is allocated (havhash true), then to tell if ``name'' is
- * (possibly) presend in the i'th component of the variable path, look
- * at the [hashname(name)] bucket of size [hashwidth] bytes, in the [i
- * mod size*8]'th bit. The cache size is defaults to a length of 1024
- * buckets, each 1 byte wide. This implementation guarantees that
- * objects n bytes wide will be aligned on n byte boundaries.
- */
-# define HSHMUL 241
-
-static unsigned long *xhash = NULL;
-static unsigned int hashlength = 0, uhashlength = 0;
-static unsigned int hashwidth = 0, uhashwidth = 0;
-static int hashdebug = 0;
-
-# define hash(a, b) (((a) * HSHMUL + (b)) % (hashlength))
-# define widthof(t) (sizeof(t) * BITS_PER_BYTE)
-# define tbit(f, i, t) (((t *) xhash)[(f)] & \
- (1L << (i & (widthof(t) - 1))))
-# define tbis(f, i, t) (((t *) xhash)[(f)] |= \
- (1L << (i & (widthof(t) - 1))))
-# define cbit(f, i) tbit(f, i, unsigned char)
-# define cbis(f, i) tbis(f, i, unsigned char)
-# define sbit(f, i) tbit(f, i, unsigned short)
-# define sbis(f, i) tbis(f, i, unsigned short)
-# define ibit(f, i) tbit(f, i, unsigned int)
-# define ibis(f, i) tbis(f, i, unsigned int)
-# define lbit(f, i) tbit(f, i, unsigned long)
-# define lbis(f, i) tbis(f, i, unsigned long)
-
-# define bit(f, i) (hashwidth==sizeof(unsigned char) ? cbit(f,i) : \
- ((hashwidth==sizeof(unsigned short) ? sbit(f,i) : \
- ((hashwidth==sizeof(unsigned int) ? ibit(f,i) : \
- lbit(f,i))))))
-# define bis(f, i) (hashwidth==sizeof(unsigned char) ? cbis(f,i) : \
- ((hashwidth==sizeof(unsigned short) ? sbis(f,i) : \
- ((hashwidth==sizeof(unsigned int) ? ibis(f,i) : \
- lbis(f,i))))))
-#else /* OLDHASH */
-/*
- * Xhash is an array of HSHSIZ bits (HSHSIZ / 8 chars), which are used
- * to hash execs. If it is allocated (havhash true), then to tell
- * whether ``name'' is (possibly) present in the i'th component
- * of the variable path, you look at the bit in xhash indexed by
- * hash(hashname("name"), i). This is setup automatically
- * after .login is executed, and recomputed whenever ``path'' is
- * changed.
- */
-# define HSHSIZ 8192 /* 1k bytes */
-# define HSHMASK (HSHSIZ - 1)
-# define HSHMUL 243
-static char xhash[HSHSIZ / BITS_PER_BYTE];
-
-# define hash(a, b) (((a) * HSHMUL + (b)) & HSHMASK)
-# define bit(h, b) ((h)[(b) >> 3] & 1 << ((b) & 7)) /* bit test */
-# define bis(h, b) ((h)[(b) >> 3] |= 1 << ((b) & 7)) /* bit set */
-
-#endif /* FASTHASH */
-
-#ifdef VFORK
-static int hits, misses;
-#endif /* VFORK */
-
-/* Dummy search path for just absolute search when no path */
-static Char *justabs[] = {STRNULL, 0};
-
-static void pexerr __P((void));
-static void texec __P((Char *, Char **));
-static int hashname __P((Char *));
-static int iscommand __P((Char *));
-
-void
-doexec(t)
- register struct command *t;
-{
- register Char *dp, **pv, **av, *sav;
- register struct varent *v;
- register bool slash;
- register int hashval, i;
- Char *blk[2];
-
- /*
- * Glob the command name. We will search $path even if this does something,
- * as in sh but not in csh. One special case: if there is no PATH, then we
- * execute only commands which start with '/'.
- */
- blk[0] = t->t_dcom[0];
- blk[1] = 0;
- gflag = 0, tglob(blk);
- if (gflag) {
- pv = globall(blk);
- if (pv == 0) {
- setname(short2str(blk[0]));
- stderror(ERR_NAME | ERR_NOMATCH);
- }
- gargv = 0;
- }
- else
- pv = saveblk(blk);
-
- trim(pv);
-
- exerr = 0;
- expath = Strsave(pv[0]);
-#ifdef VFORK
- Vexpath = expath;
-#endif /* VFORK */
-
- v = adrof(STRpath);
- if (v == 0 && expath[0] != '/' && expath[0] != '.') {
- blkfree(pv);
- pexerr();
- }
- slash = any(short2str(expath), '/');
-
- /*
- * Glob the argument list, if necessary. Otherwise trim off the quote bits.
- */
- gflag = 0;
- av = &t->t_dcom[1];
- tglob(av);
- if (gflag) {
- av = globall(av);
- if (av == 0) {
- blkfree(pv);
- setname(short2str(expath));
- stderror(ERR_NAME | ERR_NOMATCH);
- }
- gargv = 0;
- }
- else
- av = saveblk(av);
-
- blkfree(t->t_dcom);
- t->t_dcom = blkspl(pv, av);
- xfree((ptr_t) pv);
- xfree((ptr_t) av);
- av = t->t_dcom;
- trim(av);
-
- if (*av == NULL || **av == '\0')
- pexerr();
-
- xechoit(av); /* Echo command if -x */
-#ifdef CLOSE_ON_EXEC
- /*
- * Since all internal file descriptors are set to close on exec, we don't
- * need to close them explicitly here. Just reorient ourselves for error
- * messages.
- */
- SHIN = 0;
- SHOUT = 1;
- SHDIAG = 2;
- OLDSTD = 0;
- isoutatty = isatty(SHOUT);
- isdiagatty = isatty(SHDIAG);
-#else
- closech(); /* Close random fd's */
-#endif
- /*
- * We must do this AFTER any possible forking (like `foo` in glob) so that
- * this shell can still do subprocesses.
- */
-#ifdef BSDSIGS
- (void) sigsetmask((sigmask_t) 0);
-#else /* BSDSIGS */
- (void) sigrelse(SIGINT);
- (void) sigrelse(SIGCHLD);
-#endif /* BSDSIGS */
-
- /*
- * If no path, no words in path, or a / in the filename then restrict the
- * command search.
- */
- if (v == 0 || v->vec[0] == 0 || slash)
- pv = justabs;
- else
- pv = v->vec;
- sav = Strspl(STRslash, *av);/* / command name for postpending */
-#ifdef VFORK
- Vsav = sav;
-#endif /* VFORK */
- hashval = havhash ? hashname(*av) : 0;
-
- i = 0;
-#ifdef VFORK
- hits++;
-#endif /* VFORK */
- do {
- /*
- * Try to save time by looking at the hash table for where this command
- * could be. If we are doing delayed hashing, then we put the names in
- * one at a time, as the user enters them. This is kinda like Korn
- * Shell's "tracked aliases".
- */
- 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 */
- {
-
-#ifdef COHERENT
- if (t->t_dflg & F_AMPERSAND) {
-# ifdef JOBDEBUG
- xprintf("set SIGINT to SIG_IGN\n");
- xprintf("set SIGQUIT to SIG_DFL\n");
-# endif /* JOBDEBUG */
- (void) signal(SIGINT,SIG_IGN); /* may not be necessary */
- (void) signal(SIGQUIT,SIG_DFL);
- }
-
- if (gointr && eq(gointr, STRminus)) {
-# ifdef JOBDEBUG
- xprintf("set SIGINT to SIG_IGN\n");
- xprintf("set SIGQUIT to SIG_IGN\n");
-# endif /* JOBDEBUG */
- (void) signal(SIGINT,SIG_IGN); /* may not be necessary */
- (void) signal(SIGQUIT,SIG_IGN);
- }
-#endif /* COHERENT */
-
- texec(*av, av);
-}
- else {
- dp = Strspl(*pv, sav);
-#ifdef VFORK
- Vdp = dp;
-#endif /* VFORK */
-
-#ifdef COHERENT
- if ((t->t_dflg & F_AMPERSAND)) {
-# ifdef JOBDEBUG
- xprintf("set SIGINT to SIG_IGN\n");
-# endif /* JOBDEBUG */
- /*
- * this is necessary on Coherent or all background
- * jobs are killed by CTRL-C
- * (there must be a better fix for this)
- */
- (void) signal(SIGINT,SIG_IGN);
- }
- if (gointr && eq(gointr,STRminus)) {
-# ifdef JOBDEBUG
- xprintf("set SIGINT to SIG_IGN\n");
- xprintf("set SIGQUIT to SIG_IGN\n");
-# endif /* JOBDEBUG */
- (void) signal(SIGINT,SIG_IGN); /* may not be necessary */
- (void) signal(SIGQUIT,SIG_IGN);
- }
-#endif /* COHERENT */
-
- texec(dp, av);
-#ifdef VFORK
- Vdp = 0;
-#endif /* VFORK */
- xfree((ptr_t) dp);
- }
-#ifdef VFORK
- misses++;
-#endif /* VFORK */
-cont:
- pv++;
- i++;
- } while (*pv);
-#ifdef VFORK
- hits--;
- Vsav = 0;
-#endif /* VFORK */
- xfree((ptr_t) sav);
- pexerr();
-}
-
-static void
-pexerr()
-{
- /* Couldn't find the damn thing */
- if (expath) {
- setname(short2str(expath));
-#ifdef VFORK
- Vexpath = 0;
-#endif /* VFORK */
- xfree((ptr_t) expath);
- expath = 0;
- }
- else
- setname("");
- if (exerr)
- stderror(ERR_NAME | ERR_STRING, exerr);
- stderror(ERR_NAME | ERR_COMMAND);
-}
-
-/*
- * Execute command f, arg list t.
- * Record error message if not found.
- * Also do shell scripts here.
- */
-static void
-texec(sf, st)
- Char *sf;
- register Char **st;
-{
- register char **t;
- register char *f;
- register struct varent *v;
- Char **vp;
- Char *lastsh[2];
- char pref[2];
- int fd;
- Char *st0, **ost;
-
- /* The order for the conversions is significant */
- t = short2blk(st);
- f = short2str(sf);
-#ifdef VFORK
- Vt = t;
-#endif /* VFORK */
- errno = 0; /* don't use a previous error */
-#ifdef apollo
- /*
- * If we try to execute an nfs mounted directory on the apollo, we
- * hang forever. So until apollo fixes that..
- */
- {
- struct stat stb;
- if (stat(f, &stb) == 0 && S_ISDIR(stb.st_mode))
- errno = EISDIR;
- }
- if (errno == 0)
-#endif /* apollo */
- {
-#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);
- switch (errno) {
-
- case ENOEXEC:
-#ifdef WINNT
- nt_feed_to_cmd(f,t);
-#endif /* WINNT */
- /*
- * From: casper@fwi.uva.nl (Casper H.S. Dik) If we could not execute
- * it, don't feed it to the shell if it looks like a binary!
- */
- if ((fd = open(f, O_RDONLY)) != -1) {
- int nread;
- 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 == 0) {
- 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
- __nt_really_exec=1;
-#endif /* WINNT */
- doexec(kp);
- }
-
- (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)) {
- flush();
- haderr = 1;
- blkpr(t), xputchar('\n');
- 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
- int is_windir; /* check if it is the windows directory */
- USE(hashval);
-#endif /* WINNT */
-
- 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;
- for (pv = v->vec; *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++, 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
- is_windir = nt_check_if_windir(short2str(*pv));
-#endif /* WINNT */
- 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
- nt_check_name_and_hash(is_windir, dp->d_name, i);
-#else /* !WINNT */
-#if defined(_UWIN) /* XXX: Add cygwin too */
- /* 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) && (strcmp(&dp->d_name[ext], ".exe") == 0 ||
- strcmp(&dp->d_name[ext], ".bat") == 0 ||
- strcmp(&dp->d_name[ext], ".com") == 0))
- dp->d_name[ext] = '\0';
- }
-#endif /* _UWIN */
-# 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 */
- }
- (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.
- */
-static 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 == 0 || v->vec[0] == 0 || 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!!
- */
-
-/*
- * 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;
-#ifdef WINNT
- int nt_exetype;
-#endif /* WINNT */
- (void) memset(path, 0, sizeof(path));
-
- if (dir && *dir) {
- copyn(path, dir, MAXPATHLEN);
- catn(path, name, MAXPATHLEN);
-#ifdef WINNT
- {
- char *ptr = short2str(path);
- char *p2 = ptr;
- int has_ext = 0;
-
- while (*ptr++)
- continue;
- --ptr;
-
- while(ptr > p2) {
- if (*ptr == '/')
- break;
- if (*ptr == '.') {
- has_ext = 1;
- break;
- }
- ptr--;
- }
- if (!has_ext && (stat(p2, &stbuf) == -1))
- catn(path, STRdotEXE, MAXPATHLEN);
- }
-#endif /* WINNT */
- 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 */
-#ifdef WINNT
- (GetBinaryType(strname,&nt_exetype) ||
- (stbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)))
-#else /* !WINNT */
- (stbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) &&
- access(strname, X_OK) == 0
-#endif /* WINNT */
- )));
-}
-
-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
- 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*/
-
- 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 == 0 || v->vec[0] == 0 || 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);
- 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
- 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*/
-
- /* 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++, 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
-int
-nt_check_if_windir(path)
- char *path;
-{
- char windir[MAX_PATH];
-
- (void)GetWindowsDirectory(windir, sizeof(windir));
- windir[2] = '/';
-
- return (strstr(path, windir) != NULL);
-}
-
-void
-nt_check_name_and_hash(is_windir, file, i)
- int is_windir;
- char *file;
- int i;
-{
- char name_only[MAX_PATH];
- char *tmp = (char *)strrchr(file, '.');
- char uptmp[5], *nameptr, *np2;
- int icount, hashval;
-
- if(!tmp || tmp[4])
- goto nodot;
-
- for (icount = 0; icount < 4; icount++)
- uptmp[icount] = toupper(tmp[icount]);
- uptmp[4]=0;
-
- if (is_windir)
- if((uptmp[1] != 'E') || (uptmp[2] != 'X') || (uptmp[3] != 'E'))
- return;
- (void) memset(name_only, 0, MAX_PATH);
- nameptr = file;
- np2 = name_only;
- while(nameptr != tmp) {
- *np2++= tolower(*nameptr);
- nameptr++;
- }
- hashval = hashname(str2short(name_only));
- bis(hashval, i);
-nodot:
- hashval = hashname(str2short(file));
- bis(hashval, i);
-}
-int hashval_extern(cp)
- Char *cp;
-{
- return havhash?hashname(cp):0;
-}
-int bit_extern(val,i)
- int val;
- int i;
-{
- return bit(val,i);
-}
-#endif /* WINNT */
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-03 02:51:03 +0000