/* * 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" #include "tc.h" #include "tw.h" #ifdef WINNT_NATIVE #include #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 */ #endif /* ISC_POSIX_EXEC_BUG */ (void) execv(f, t); #ifdef ISC_POSIX_EXEC_BUG __setostype(1); /* "1" is "__OS_POSIX" in */ #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 */ #endif /* ISC_POSIX_EXEC_BUG */ (void) execv(f, t); #ifdef ISC_POSIX_EXEC_BUG __setostype(1); /* "1" is "__OS_POSIX" in */ #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, if not in a subshell */ if (mainpid == getpid()) 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 * 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, "%" TCSH_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, "%" TCSH_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, "%" TCSH_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 * MIT Student Information Processing Board */ /*ARGSUSED*/ void dowhere(Char **v, struct command *c) { int found = 1; USE(c); if (adrof(STRautorehash)) dohash(NULL, NULL); for (v++; *v; v++) found &= find_cmd(*v, 1); /* Make status nonzero if any command is not found. */ if (!found) setstatus(1); } 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, "%" TCSH_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, "%" TCSH_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, "%" TCSH_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("%" TCSH_S "/", *pv); xprintf("%" TCSH_S "\n", cmd); } else return rval; } } /* * If we are printing, we are being called from dowhere() which it * has rehashed already */ if (!prt && 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 */