/contrib/tcsh/sh.exec.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 1196 lines · 950 code · 80 blank · 166 comment · 172 complexity · 346f5a20ecad41329829684c5bc97ae3 MD5 · raw file
- /* $Header: /p/tcsh/cvsroot/tcsh/sh.exec.c,v 3.79 2011/02/25 23:58:34 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. 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("$tcsh: sh.exec.c,v 3.79 2011/02/25 23:58:34 christos Exp $")
- #include "tc.h"
- #include "tw.h"
- #ifdef WINNT_NATIVE
- #include <nt.const.h>
- #endif /*WINNT_NATIVE*/
- /*
- * 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) present 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)] & \
- (1UL << (i & (widthof(t) - 1))))
- # define tbis(f, i, t) (((t *) xhash)[(f)] |= \
- (1UL << (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 (void) __attribute__((__noreturn__));
- static void texec (Char *, Char **);
- int hashname (Char *);
- static int iscommand (Char *);
- void
- doexec(struct command *t, int do_glob)
- {
- Char *dp, **pv, **opv, **av, *sav;
- struct varent *v;
- int slash, gflag, rehashed;
- 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;
- if (do_glob)
- gflag = tglob(blk);
- if (gflag) {
- pv = globall(blk, gflag);
- if (pv == 0) {
- setname(short2str(blk[0]));
- stderror(ERR_NAME | ERR_NOMATCH);
- }
- }
- else
- pv = saveblk(blk);
- cleanup_push(pv, blk_cleanup);
- trim(pv);
- exerr = 0;
- expath = Strsave(pv[0]);
- #ifdef VFORK
- Vexpath = expath;
- #endif /* VFORK */
- v = adrof(STRpath);
- if (v == 0 && expath[0] != '/' && expath[0] != '.')
- pexerr();
- slash = any(short2str(expath), '/');
- /*
- * Glob the argument list, if necessary. Otherwise trim off the quote bits.
- */
- gflag = 0;
- av = &t->t_dcom[1];
- if (do_glob)
- gflag = tglob(av);
- if (gflag) {
- av = globall(av, gflag);
- if (av == 0) {
- setname(short2str(expath));
- stderror(ERR_NAME | ERR_NOMATCH);
- }
- }
- else
- av = saveblk(av);
- blkfree(t->t_dcom);
- cleanup_ignore(pv);
- cleanup_until(pv);
- t->t_dcom = blkspl(pv, av);
- xfree(pv);
- xfree(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.
- */
- {
- sigset_t set;
- sigemptyset(&set);
- sigaddset(&set, SIGINT);
- sigaddset(&set, SIGCHLD);
- sigprocmask(SIG_UNBLOCK, &set, NULL);
- }
- pintr_disabled = 0;
- pchild_disabled = 0;
- /*
- * If no path, no words in path, or a / in the filename then restrict the
- * command search.
- */
- if (v == NULL || v->vec == NULL || v->vec[0] == NULL || slash)
- opv = justabs;
- else
- opv = v->vec;
- sav = Strspl(STRslash, *av);/* / command name for postpending */
- #ifndef VFORK
- cleanup_push(sav, xfree);
- #else /* VFORK */
- Vsav = sav;
- #endif /* VFORK */
- hashval = havhash ? hashname(*av) : 0;
- rehashed = 0;
- retry:
- pv = opv;
- 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 */
- texec(*av, av);
- else {
- dp = Strspl(*pv, sav);
- #ifndef VFORK
- cleanup_push(dp, xfree);
- #else /* VFORK */
- Vdp = dp;
- #endif /* VFORK */
- texec(dp, av);
- #ifndef VFORK
- cleanup_until(dp);
- #else /* VFORK */
- Vdp = 0;
- xfree(dp);
- #endif /* VFORK */
- }
- #ifdef VFORK
- misses++;
- #endif /* VFORK */
- cont:
- pv++;
- i++;
- } while (*pv);
- #ifdef VFORK
- hits--;
- #endif /* VFORK */
- if (adrof(STRautorehash) && !rehashed && havhash && opv != justabs) {
- dohash(NULL, NULL);
- rehashed = 1;
- goto retry;
- }
- #ifndef VFORK
- cleanup_until(sav);
- #else /* VFORK */
- Vsav = 0;
- xfree(sav);
- #endif /* VFORK */
- pexerr();
- }
- static void
- pexerr(void)
- {
- /* Couldn't find the damn thing */
- if (expath) {
- setname(short2str(expath));
- #ifdef VFORK
- Vexpath = 0;
- #endif /* VFORK */
- xfree(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(Char *sf, Char **st)
- {
- char **t;
- char *f;
- 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_NATIVE
- nt_feed_to_cmd(f,t);
- #endif /* WINNT_NATIVE */
- /*
- * 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 = xopen(f, O_RDONLY|O_LARGEFILE)) != -1) {
- int nread;
- if ((nread = xread(fd, pref, 2)) == 2) {
- if (!isprint((unsigned char)pref[0]) &&
- (pref[0] != '\n' && pref[0] != '\t')) {
- int err;
- err = errno;
- xclose(fd);
- /*
- * We *know* what ENOEXEC means.
- */
- stderror(ERR_ARCH, f, strerror(err));
- }
- }
- else if (nread < 0) {
- #ifdef convex
- int err;
- err = errno;
- xclose(fd);
- /* need to print error incase the file is migrated */
- stderror(ERR_SYSTEM, f, strerror(err));
- #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)
- xclose(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(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);
- xfree(expath);
- expath = Strsave(sf);
- #ifdef VFORK
- Vexpath = expath;
- #endif /* VFORK */
- }
- break;
- }
- }
- struct execash_state
- {
- int saveIN, saveOUT, saveDIAG, saveSTD;
- int SHIN, SHOUT, SHDIAG, OLDSTD;
- int didfds;
- #ifndef CLOSE_ON_EXEC
- int didcch;
- #endif
- struct sigaction sigint, sigquit, sigterm;
- };
- static void
- execash_cleanup(void *xstate)
- {
- struct execash_state *state;
- state = xstate;
- sigaction(SIGINT, &state->sigint, NULL);
- sigaction(SIGQUIT, &state->sigquit, NULL);
- sigaction(SIGTERM, &state->sigterm, NULL);
- doneinp = 0;
- #ifndef CLOSE_ON_EXEC
- didcch = state->didcch;
- #endif /* CLOSE_ON_EXEC */
- didfds = state->didfds;
- xclose(SHIN);
- xclose(SHOUT);
- xclose(SHDIAG);
- xclose(OLDSTD);
- close_on_exec(SHIN = dmove(state->saveIN, state->SHIN), 1);
- close_on_exec(SHOUT = dmove(state->saveOUT, state->SHOUT), 1);
- close_on_exec(SHDIAG = dmove(state->saveDIAG, state->SHDIAG), 1);
- close_on_exec(OLDSTD = dmove(state->saveSTD, state->OLDSTD), 1);
- }
- /*ARGSUSED*/
- void
- execash(Char **t, struct command *kp)
- {
- struct execash_state state;
- 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);
- sigaction(SIGINT, &parintr, &state.sigint);
- sigaction(SIGQUIT, &parintr, &state.sigquit);
- sigaction(SIGTERM, &parterm, &state.sigterm);
- state.didfds = didfds;
- #ifndef CLOSE_ON_EXEC
- state.didcch = didcch;
- #endif /* CLOSE_ON_EXEC */
- state.SHIN = SHIN;
- state.SHOUT = SHOUT;
- state.SHDIAG = SHDIAG;
- state.OLDSTD = OLDSTD;
- (void)close_on_exec (state.saveIN = dcopy(SHIN, -1), 1);
- (void)close_on_exec (state.saveOUT = dcopy(SHOUT, -1), 1);
- (void)close_on_exec (state.saveDIAG = dcopy(SHDIAG, -1), 1);
- (void)close_on_exec (state.saveSTD = dcopy(OLDSTD, -1), 1);
- lshift(kp->t_dcom, 1);
- (void)close_on_exec (SHIN = dcopy(0, -1), 1);
- (void)close_on_exec (SHOUT = dcopy(1, -1), 1);
- (void)close_on_exec (SHDIAG = dcopy(2, -1), 1);
- #ifndef CLOSE_ON_EXEC
- didcch = 0;
- #endif /* CLOSE_ON_EXEC */
- didfds = 0;
- cleanup_push(&state, execash_cleanup);
- /*
- * Decrement the shell level
- */
- shlvl(-1);
- #ifdef WINNT_NATIVE
- __nt_really_exec=1;
- #endif /* WINNT_NATIVE */
- doexec(kp, 1);
- cleanup_until(&state);
- }
- void
- xechoit(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(Char **vv, struct command *c)
- {
- #ifdef COMMENT
- struct stat stb;
- #endif
- DIR *dirp;
- 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 */
- xfree(xhash);
- xhash = xcalloc(hashlength * hashwidth, 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;
- cleanup_push(dirp, opendir_cleanup);
- #ifdef COMMENT /* this isn't needed. opendir won't open
- * non-dirs */
- if (fstat(dirp->dd_fd, &stb) < 0 || !S_ISDIR(stb.st_mode)) {
- cleanup_until(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
- *
- * Same for Cygwin, but only for .exe and .com extension.
- */
- {
- ssize_t ext = strlen(dp->d_name) - 4;
- if ((ext > 0) && (strcasecmp(&dp->d_name[ext], ".exe") == 0 ||
- #ifndef __CYGWIN__
- strcasecmp(&dp->d_name[ext], ".bat") == 0 ||
- #endif
- strcasecmp(&dp->d_name[ext], ".com") == 0)) {
- #ifdef __CYGWIN__
- /* Also store the variation with extension. */
- hashval = hashname(str2short(dp->d_name));
- bis(hashval, i);
- #endif /* __CYGWIN__ */
- dp->d_name[ext] = '\0';
- }
- }
- #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 */
- }
- cleanup_until(dirp);
- }
- }
- /*ARGSUSED*/
- void
- dounhash(Char **v, struct command *c)
- {
- USE(c);
- USE(v);
- havhash = 0;
- #ifdef FASTHASH
- xfree(xhash);
- xhash = NULL;
- #endif /* FASTHASH */
- }
- /*ARGSUSED*/
- void
- hashstat(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(Char *cp)
- {
- unsigned long h;
- for (h = 0; *cp; cp++)
- h = hash(h, *cp);
- return ((int) h);
- }
- static int
- iscommand(Char *name)
- {
- Char **opv, **pv;
- Char *sav;
- struct varent *v;
- int slash = any(short2str(name), '/');
- int hashval, rehashed, i;
- v = adrof(STRpath);
- if (v == NULL || v->vec == NULL || v->vec[0] == NULL || slash)
- opv = justabs;
- else
- opv = v->vec;
- sav = Strspl(STRslash, name); /* / command name for postpending */
- hashval = havhash ? hashname(name) : 0;
- rehashed = 0;
- retry:
- pv = opv;
- 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(sav);
- return i + 1;
- }
- }
- else {
- if (executable(*pv, sav, 0)) {
- xfree(sav);
- return i + 1;
- }
- }
- cont:
- pv++;
- i++;
- } while (*pv);
- if (adrof(STRautorehash) && !rehashed && havhash && opv != justabs) {
- dohash(NULL, NULL);
- rehashed = 1;
- goto retry;
- }
- xfree(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(const Char *dir, const Char *name, int dir_ok)
- {
- struct stat stbuf;
- char *strname;
- if (dir && *dir) {
- Char *path;
- path = Strspl(dir, name);
- strname = short2str(path);
- xfree(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*/
- struct tellmewhat_s0_cleanup
- {
- Char **dest, *val;
- };
- static void
- tellmewhat_s0_cleanup(void *xstate)
- {
- struct tellmewhat_s0_cleanup *state;
- state = xstate;
- *state->dest = state->val;
- }
- int
- tellmewhat(struct wordent *lexp, Char **str)
- {
- struct tellmewhat_s0_cleanup s0;
- int i;
- const struct biltins *bptr;
- struct wordent *sp = lexp->next;
- int aliased = 0, found;
- Char *s1, *s2, *cmd;
- Char qc;
- if (adrof1(sp->word, &aliases)) {
- alias(lexp);
- sp = lexp->next;
- aliased = 1;
- }
- s0.dest = &sp->word; /* to get the memory freeing right... */
- s0.val = sp->word;
- cleanup_push(&s0, tellmewhat_s0_cleanup);
- /* 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
- *str = Strsave(sp->word);
- cleanup_until(&s0);
- 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
- *str = Strsave(sp->word);
- cleanup_until(&s0);
- return TRUE;
- }
- }
- #endif /* WINNT_NATIVE*/
- sp->word = cmd = globone(sp->word, G_IGNORE);
- cleanup_push(cmd, xfree);
- if ((i = iscommand(sp->word)) != 0) {
- Char **pv;
- struct varent *v;
- int 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;
- pv += i - 1;
- if (pv[0][0] == 0 || eq(pv[0], STRdot)) {
- if (!slash) {
- sp->word = Strspl(STRdotsl, sp->word);
- cleanup_push(sp->word, xfree);
- prlex(lexp);
- cleanup_until(sp->word);
- }
- else
- prlex(lexp);
- }
- else {
- s1 = Strspl(*pv, STRslash);
- sp->word = Strspl(s1, sp->word);
- xfree(s1);
- cleanup_push(sp->word, xfree);
- if (str == NULL)
- prlex(lexp);
- else
- *str = Strsave(sp->word);
- cleanup_until(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
- *str = Strsave(sp->word);
- found = 0;
- }
- cleanup_until(&s0);
- 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(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)
- setcopy(STRstatus, STR1, VAR_READWRITE);
- }
- int
- find_cmd(Char *cmd, int prt)
- {
- struct varent *var;
- const struct biltins *bptr;
- Char **pv;
- Char *sv;
- int hashval, rehashed, i, ex, rval = 0;
- if (prt && any(short2str(cmd), '/')) {
- xprintf("%s", 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);
- cleanup_push(sv, xfree);
- rehashed = 0;
- retry:
- 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("%s", 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;
- }
- }
- if (adrof(STRautorehash) && !rehashed && havhash) {
- dohash(NULL, NULL);
- rehashed = 1;
- goto retry;
- }
- cleanup_until(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 */