1 /* $Header: /src/pub/tcsh/sh.exp.c,v 3.40 2002/03/08 17:36:46 christos Exp $ */
3 * sh.exp.c: Expression evaluations
6 * Copyright (c) 1980, 1991 The Regents of the University of California.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 RCSID("$Id: sh.exp.c,v 3.40 2002/03/08 17:36:46 christos Exp $")
43 #define TEXP_IGNORE 1 /* in ignore, it means to ignore value, just parse */
44 #define TEXP_NOGLOB 2 /* in ignore, it means not to globone */
60 static int sh_access __P((Char *, int));
61 static int exp1 __P((Char ***, bool));
62 static int exp2 __P((Char ***, bool));
63 static int exp2a __P((Char ***, bool));
64 static int exp2b __P((Char ***, bool));
65 static int exp2c __P((Char ***, bool));
66 static Char *exp3 __P((Char ***, bool));
67 static Char *exp3a __P((Char ***, bool));
68 static Char *exp4 __P((Char ***, bool));
69 static Char *exp5 __P((Char ***, bool));
70 static Char *exp6 __P((Char ***, bool));
71 static void evalav __P((Char **));
72 static int isa __P((Char *, int));
73 static int egetn __P((Char *));
77 static void etracc __P((char *, Char *, Char ***));
78 static void etraci __P((char *, int, Char ***));
83 * shell access function according to POSIX and non POSIX
84 * From Beto Appleton (beto@aixwiz.aix.ibm.com)
87 sh_access(fname, mode)
91 #if defined(POSIX) && !defined(USE_ACCESS)
94 char *name = short2str(fname);
99 #if !defined(POSIX) || defined(USE_ACCESS)
100 return access(name, mode);
105 * -r file True if file exists and is readable.
106 * -w file True if file exists and is writable.
107 * True shall indicate only that the write flag is on.
108 * The file shall not be writable on a read-only file
109 * system even if this test indicates true.
110 * -x file True if file exists and is executable.
111 * True shall indicate only that the execute flag is on.
112 * If file is a directory, true indicates that the file
115 if (mode != W_OK && mode != X_OK)
116 return access(name, mode);
118 if (stat(name, &statb) == -1)
121 if (access(name, mode) == 0) {
123 if (S_ISDIR(statb.st_mode) && mode == X_OK)
127 /* root needs permission for someone */
130 mode = S_IWUSR | S_IWGRP | S_IWOTH;
133 mode = S_IXUSR | S_IXGRP | S_IXOTH;
142 else if (euid == statb.st_uid)
145 else if (egid == statb.st_gid)
150 # if defined(__386BSD__) || defined(BSD4_4)
152 * These two decided that setgroup() should take an array of int's
153 * and they define _SC_NGROUPS_MAX without having sysconf
155 # undef _SC_NGROUPS_MAX
156 # if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__bsdi__)
163 # endif /* __386BSD__ || BSD4_4 */
164 /* you can be in several groups */
169 * Try these things to find a positive maximum groups value:
170 * 1) sysconf(_SC_NGROUPS_MAX)
172 * 3) getgroups(0, unused)
173 * Then allocate and scan the groups array if one of these worked.
175 # ifdef _SC_NGROUPS_MAX
176 if ((n = sysconf(_SC_NGROUPS_MAX)) == -1)
177 # endif /* _SC_NGROUPS_MAX */
180 n = getgroups(0, (GID_T *) NULL);
183 groups = (GID_T *) xmalloc((size_t) (n * sizeof(GID_T)));
184 n = getgroups((int) n, groups);
186 if (groups[n] == statb.st_gid) {
192 # endif /* NGROUPS_MAX */
194 if (statb.st_mode & mode)
205 return (exp0(vp, 0));
213 register int p1 = exp1(vp, ignore);
216 etraci("exp0 p1", p1, vp);
218 if (**vp && eq(**vp, STRor2)) {
222 p2 = exp0(vp, (ignore & TEXP_IGNORE) || p1);
224 etraci("exp0 p2", p2, vp);
236 register int p1 = exp2(vp, ignore);
239 etraci("exp1 p1", p1, vp);
241 if (**vp && eq(**vp, STRand2)) {
245 p2 = exp1(vp, (ignore & TEXP_IGNORE) || !p1);
247 etraci("exp1 p2", p2, vp);
259 register int p1 = exp2a(vp, ignore);
262 etraci("exp3 p1", p1, vp);
264 if (**vp && eq(**vp, STRor)) {
268 p2 = exp2(vp, ignore);
270 etraci("exp3 p2", p2, vp);
282 register int p1 = exp2b(vp, ignore);
285 etraci("exp2a p1", p1, vp);
287 if (**vp && eq(**vp, STRcaret)) {
291 p2 = exp2a(vp, ignore);
293 etraci("exp2a p2", p2, vp);
305 register int p1 = exp2c(vp, ignore);
308 etraci("exp2b p1", p1, vp);
310 if (**vp && eq(**vp, STRand)) {
314 p2 = exp2b(vp, ignore);
316 etraci("exp2b p2", p2, vp);
328 register Char *p1 = exp3(vp, ignore);
333 etracc("exp2c p1", p1, vp);
335 if ((i = isa(**vp, EQOP)) != 0) {
337 if (i == EQMATCH || i == NOTEQMATCH)
338 ignore |= TEXP_NOGLOB;
339 p2 = exp3(vp, ignore);
341 etracc("exp2c p2", p2, vp);
343 if (!(ignore & TEXP_IGNORE))
376 register Char *p1, *p2;
379 p1 = exp3a(vp, ignore);
381 etracc("exp3 p1", p1, vp);
383 if ((i = isa(**vp, RELOP)) != 0) {
385 if (**vp && eq(**vp, STRequal))
387 p2 = exp3(vp, ignore);
389 etracc("exp3 p2", p2, vp);
391 if (!(ignore & TEXP_IGNORE))
395 i = egetn(p1) > egetn(p2);
399 i = egetn(p1) >= egetn(p2);
403 i = egetn(p1) < egetn(p2);
407 i = egetn(p1) <= egetn(p2);
422 register Char *p1, *p2, *op;
425 p1 = exp4(vp, ignore);
427 etracc("exp3a p1", p1, vp);
430 if (op && any("<>", op[0]) && op[0] == op[1]) {
432 p2 = exp3a(vp, ignore);
434 etracc("exp3a p2", p2, vp);
437 i = egetn(p1) << egetn(p2);
439 i = egetn(p1) >> egetn(p2);
452 register Char *p1, *p2;
455 p1 = exp5(vp, ignore);
457 etracc("exp4 p1", p1, vp);
459 if (isa(**vp, ADDOP)) {
460 register Char *op = *(*vp)++;
462 p2 = exp4(vp, ignore);
464 etracc("exp4 p2", p2, vp);
466 if (!(ignore & TEXP_IGNORE))
470 i = egetn(p1) + egetn(p2);
474 i = egetn(p1) - egetn(p2);
489 register Char *p1, *p2;
492 p1 = exp6(vp, ignore);
494 etracc("exp5 p1", p1, vp);
497 if (isa(**vp, MULOP)) {
498 register Char *op = *(*vp)++;
499 if ((ignore & TEXP_NOGLOB) != 0)
501 * We are just trying to get the right side of
502 * a =~ or !~ operator
506 p2 = exp5(vp, ignore);
508 etracc("exp5 p2", p2, vp);
510 if (!(ignore & TEXP_IGNORE))
514 i = egetn(p1) * egetn(p2);
547 stderror(ERR_NAME | ERR_EXPRESSION);
548 if (eq(**vp, STRbang)) {
550 cp = exp6(vp, ignore);
552 etracc("exp6 ! cp", cp, vp);
558 if (eq(**vp, STRtilde)) {
560 cp = exp6(vp, ignore);
562 etracc("exp6 ~ cp", cp, vp);
568 if (eq(**vp, STRLparen)) {
570 ccode = exp0(vp, ignore);
572 etraci("exp6 () ccode", ccode, vp);
574 if (*vp == 0 || **vp == 0 || ***vp != ')')
575 stderror(ERR_NAME | ERR_EXPRESSION);
577 return (putn(ccode));
579 if (eq(**vp, STRLbrace)) {
581 struct command faket;
584 faket.t_dtyp = NODE_COMMAND;
585 faket.t_dflg = F_BACKQ;
586 faket.t_dcar = faket.t_dcdr = faket.t_dspr = NULL;
587 faket.t_dcom = fakecom;
588 fakecom[0] = STRfakecom;
594 stderror(ERR_NAME | ERR_MISSING, '}');
595 if (eq(*(*vp)++, STRRbrace))
598 if (ignore & TEXP_IGNORE)
599 return (Strsave(STRNULL));
601 if (pfork(&faket, -1) == 0) {
609 etraci("exp6 {} status", egetn(varval(STRstatus)), vp);
611 return (putn(egetn(varval(STRstatus)) == 0));
613 if (isa(**vp, ANYOP))
614 return (Strsave(STRNULL));
617 # define FILETESTS "erwxfdzoplstSXLbcugkmKR"
619 # define FILETESTS "erwxfdzoplstSXLbcugkmK"
621 #define FILEVALS "ZAMCDIUGNFPL"
622 if (*cp == '-' && (any(FILETESTS, cp[1]) || any(FILEVALS, cp[1])))
623 return(filetest(cp, vp, ignore));
625 etracc("exp6 default", cp, vp);
627 return (ignore & TEXP_NOGLOB ? Strsave(cp) : globone(cp, G_APPEND));
632 * Extended file tests
633 * From: John Rowe <rowe@excc.exeter.ac.uk>
636 filetest(cp, vp, ignore)
641 struct cvxstat stb, *st = NULL;
642 # define TCSH_STAT stat64
644 # define TCSH_STAT stat
645 struct stat stb, *st = NULL;
650 struct cvxstat lstb, *lst = NULL;
651 # define TCSH_LSTAT lstat64
653 # define TCSH_LSTAT lstat
654 struct stat lstb, *lst = NULL;
660 unsigned pmask = 0xffff;
662 Char *ft = cp, *dp, *ep, *strdev, *strino, *strF, *str, valtest = '\0',
664 char *string, string0[8];
669 while(any(FILETESTS, *++ft))
672 if (!*ft && *(ft - 1) == 'L')
675 if (any(FILEVALS, *ft)) {
678 * Value tests return '-1' on failure as 0 is
679 * a legitimate value for many of them.
680 * 'F' returns ':' for compatibility.
682 errval = valtest == 'F' ? STRcolon : STRminus1;
684 if (valtest == 'P' && *ft >= '0' && *ft <= '7') {
685 pmask = (char) *ft - '0';
686 while ( *++ft >= '0' && *ft <= '7' )
687 pmask = 8 * pmask + ((char) *ft - '0');
689 if (Strcmp(ft, STRcolon) == 0 && any("AMCUGP", valtest)) {
695 if (*ft || ft == cp + 1)
696 stderror(ERR_NAME | ERR_FILEINQ);
699 * Detect missing file names by checking for operator in the file name
700 * position. However, if an operator name appears there, we must make
701 * sure that there's no file by that name (e.g., "/") before announcing
702 * an error. Even this check isn't quite right, since it doesn't take
703 * globbing into account.
706 if (isa(**vp, ANYOP) && TCSH_STAT(short2str(**vp), &stb))
707 stderror(ERR_NAME | ERR_FILENAME);
710 if (ignore & TEXP_IGNORE)
711 return (Strsave(STRNULL));
712 ep = globone(dp, G_APPEND);
718 i = !sh_access(ep, R_OK);
722 i = !sh_access(ep, W_OK);
726 i = !sh_access(ep, X_OK);
729 case 'X': /* tcsh extension, name is an executable in the path
730 * or a tcsh builtin command
735 case 't': /* SGI extension, true when file is a tty */
736 i = isatty(atoi(short2str(ep)));
742 if (tolower(*ft) == 'l') {
744 * avoid convex compiler bug.
748 if (TCSH_LSTAT(short2str(ep), lst) == -1) {
750 return (Strsave(errval));
759 * avoid convex compiler bug.
763 if (TCSH_STAT(short2str(ep), st) == -1) {
765 return (Strsave(errval));
773 i = S_ISREG(st->st_mode);
781 i = S_ISDIR(st->st_mode);
789 i = S_ISFIFO(st->st_mode);
790 #else /* !S_ISFIFO */
792 #endif /* S_ISFIFO */
797 i = S_ISOFL(st->st_dm_mode);
814 i = S_ISLNK(lst->st_mode);
822 i = S_ISSOCK(st->st_mode);
823 # else /* !S_ISSOCK */
825 # endif /* S_ISSOCK */
830 i = S_ISBLK(st->st_mode);
838 i = S_ISCHR(st->st_mode);
845 i = (S_ISUID & st->st_mode) != 0;
849 i = (S_ISGID & st->st_mode) != 0;
853 i = (S_ISVTX & st->st_mode) != 0;
857 i = st->st_size == 0;
862 i = (stb.st_dmonflags & IMIGRATED) == IMIGRATED;
867 i = stb.st_size != 0;
875 i = st->st_uid == uid;
879 * Value operators are a tcsh extension.
883 i = (int) st->st_dev;
887 i = (int) st->st_ino;
891 strdev = putn( (int) st->st_dev);
892 strino = putn( (int) st->st_ino);
893 strF = (Char *) xmalloc((size_t) (2 + Strlen(strdev) +
894 Strlen(strino)) * sizeof(Char));
895 (void) Strcat(Strcat(Strcpy(strF, strdev), STRcolon), strino);
896 xfree((ptr_t) strdev);
897 xfree((ptr_t) strino);
907 filnam = short2str(ep);
909 # define MY_PATH_MAX PATH_MAX
910 #else /* !PATH_MAX */
912 * I can't think of any more sensible alterative; readlink doesn't give
913 * us an errno if the buffer isn't large enough :-(
915 # define MY_PATH_MAX 2048
916 #endif /* PATH_MAX */
917 i = readlink(filnam, string = (char *)
918 xmalloc((size_t) (1 + MY_PATH_MAX) * sizeof(char)),
920 if (i >= 0 && i <= MY_PATH_MAX)
921 string[i] = '\0'; /* readlink does not null terminate */
922 strF = (i < 0) ? errval : str2short(string);
923 xfree((ptr_t) string);
925 return(Strsave(strF));
934 i = (int) st->st_nlink;
938 string = string0 + 1;
939 (void) xsnprintf(string, sizeof(string0) - 1, "%o",
940 pmask & (unsigned int)
941 ((S_IRWXU|S_IRWXG|S_IRWXO|S_ISUID|S_ISGID) & st->st_mode));
942 if (altout && *string != '0')
945 return(Strsave(str2short(string)));
948 if (altout && (pw = getpwuid(st->st_uid))) {
950 return(Strsave(str2short(pw->pw_name)));
952 i = (int) st->st_uid;
956 if ( altout && (gr = getgrgid(st->st_gid))) {
958 return(Strsave(str2short(gr->gr_name)));
960 i = (int) st->st_gid;
964 i = (int) st->st_size;
967 case 'A': case 'M': case 'C':
968 footime = *ft == 'A' ? st->st_atime :
969 *ft == 'M' ? st->st_mtime : st->st_ctime;
971 strF = str2short(ctime(&footime));
972 if ((str = Strchr(strF, '\n')) != NULL)
975 return(Strsave(strF));
984 etraci("exp6 -? i", i, vp);
995 struct wordent paraml1;
996 register struct wordent *hp = ¶ml1;
998 register struct wordent *wdp = hp;
1000 set(STRstatus, Strsave(STR0), VAR_READWRITE);
1001 hp->prev = hp->next = hp;
1004 register struct wordent *new =
1005 (struct wordent *) xcalloc(1, sizeof *wdp);
1011 wdp->word = Strsave(*v++);
1015 t = syntax(paraml1.next, ¶ml1, 0);
1018 execute(t, -1, NULL, NULL, TRUE);
1019 freelex(¶ml1), freesyn(t);
1028 return ((what & RESTOP) != 0);
1032 if (what & ADDOP && (*cp == '+' || *cp == '-'))
1034 if (what & MULOP && (*cp == '*' || *cp == '/' || *cp == '%'))
1036 if (what & RESTOP && (*cp == '(' || *cp == ')' || *cp == '!' ||
1037 *cp == '~' || *cp == '^' || *cp == '"'))
1040 else if (cp[2] == 0) {
1041 if (what & RESTOP) {
1042 if (cp[0] == '|' && cp[1] == '&')
1044 if (cp[0] == '<' && cp[1] == '<')
1046 if (cp[0] == '>' && cp[1] == '>')
1056 else if (cp[0] == '!') {
1060 return (NOTEQMATCH);
1077 if (*cp && *cp != '-' && !Isdigit(*cp))
1078 stderror(ERR_NAME | ERR_EXPRESSION);
1091 xprintf("%s=%d\t", str, i);
1101 xprintf("%s=%s\t", str, cp);