diff options
author | obrien <obrien@FreeBSD.org> | 2000-04-15 04:41:27 +0000 |
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committer | obrien <obrien@FreeBSD.org> | 2000-04-15 04:41:27 +0000 |
commit | 4ad28cefef28ce6bdb44a0532cfe20a2076bc694 (patch) | |
tree | 7679c440a91912ee9586cee3ebab24596c0fe1c4 /contrib/tcsh/sh.exp.c | |
download | FreeBSD-src-4ad28cefef28ce6bdb44a0532cfe20a2076bc694.zip FreeBSD-src-4ad28cefef28ce6bdb44a0532cfe20a2076bc694.tar.gz |
Import the latest version of the 44BSD C-shell -- tcsh-6.09.
Diffstat (limited to 'contrib/tcsh/sh.exp.c')
-rw-r--r-- | contrib/tcsh/sh.exp.c | 1107 |
1 files changed, 1107 insertions, 0 deletions
diff --git a/contrib/tcsh/sh.exp.c b/contrib/tcsh/sh.exp.c new file mode 100644 index 0000000..6a26775 --- /dev/null +++ b/contrib/tcsh/sh.exp.c @@ -0,0 +1,1107 @@ +/* $Header: /src/pub/tcsh/sh.exp.c,v 3.38 1998/11/24 18:17:32 christos Exp $ */ +/* + * sh.exp.c: Expression evaluations + */ +/*- + * 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.exp.c,v 3.38 1998/11/24 18:17:32 christos Exp $") + +/* + * C shell + */ + +#define TEXP_IGNORE 1 /* in ignore, it means to ignore value, just parse */ +#define TEXP_NOGLOB 2 /* in ignore, it means not to globone */ + +#define ADDOP 1 +#define MULOP 2 +#define EQOP 4 +#define RELOP 8 +#define RESTOP 16 +#define ANYOP 31 + +#define EQEQ 1 +#define GTR 2 +#define LSS 4 +#define NOTEQ 6 +#define EQMATCH 7 +#define NOTEQMATCH 8 + +static int sh_access __P((Char *, int)); +static int exp1 __P((Char ***, bool)); +static int exp2 __P((Char ***, bool)); +static int exp2a __P((Char ***, bool)); +static int exp2b __P((Char ***, bool)); +static int exp2c __P((Char ***, bool)); +static Char *exp3 __P((Char ***, bool)); +static Char *exp3a __P((Char ***, bool)); +static Char *exp4 __P((Char ***, bool)); +static Char *exp5 __P((Char ***, bool)); +static Char *exp6 __P((Char ***, bool)); +static void evalav __P((Char **)); +static int isa __P((Char *, int)); +static int egetn __P((Char *)); + + +#ifdef EDEBUG +static void etracc __P((char *, Char *, Char ***)); +static void etraci __P((char *, int, Char ***)); +#endif /* EDEBUG */ + + +/* + * shell access function according to POSIX and non POSIX + * From Beto Appleton (beto@aixwiz.aix.ibm.com) + */ +static int +sh_access(fname, mode) + Char *fname; + int mode; +{ +#if defined(POSIX) && !defined(USE_ACCESS) + struct stat statb; +#endif /* POSIX */ + char *name = short2str(fname); + + if (*name == '\0') + return 1; + +#if !defined(POSIX) || defined(USE_ACCESS) + return access(name, mode); +#else /* POSIX */ + + /* + * POSIX 1003.2-d11.2 + * -r file True if file exists and is readable. + * -w file True if file exists and is writable. + * True shall indicate only that the write flag is on. + * The file shall not be writable on a read-only file + * system even if this test indicates true. + * -x file True if file exists and is executable. + * True shall indicate only that the execute flag is on. + * If file is a directory, true indicates that the file + * can be searched. + */ + if (mode != W_OK && mode != X_OK) + return access(name, mode); + + if (stat(name, &statb) == -1) + return 1; + + if (access(name, mode) == 0) { +#ifdef S_ISDIR + if (S_ISDIR(statb.st_mode) && mode == X_OK) + return 0; +#endif /* S_ISDIR */ + + /* root needs permission for someone */ + switch (mode) { + case W_OK: + mode = S_IWUSR | S_IWGRP | S_IWOTH; + break; + case X_OK: + mode = S_IXUSR | S_IXGRP | S_IXOTH; + break; + default: + abort(); + break; + } + + } + + else if (euid == statb.st_uid) + mode <<= 6; + + else if (egid == statb.st_gid) + mode <<= 3; + +# ifdef NGROUPS_MAX + else { +# if defined(__386BSD__) || defined(BSD4_4) + /* + * These two decided that setgroup() should take an array of int's + * and they define _SC_NGROUPS_MAX without having sysconf + */ +# undef _SC_NGROUPS_MAX +# if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__bsdi__) +# define GID_T gid_t +# else +# define GID_T int +# endif +# else +# define GID_T gid_t +# endif /* __386BSD__ || BSD4_4 */ + /* you can be in several groups */ + long n; + GID_T *groups; + + /* + * Try these things to find a positive maximum groups value: + * 1) sysconf(_SC_NGROUPS_MAX) + * 2) NGROUPS_MAX + * 3) getgroups(0, unused) + * Then allocate and scan the groups array if one of these worked. + */ +# ifdef _SC_NGROUPS_MAX + if ((n = sysconf(_SC_NGROUPS_MAX)) == -1) +# endif /* _SC_NGROUPS_MAX */ + n = NGROUPS_MAX; + if (n <= 0) + n = getgroups(0, (GID_T *) NULL); + + if (n > 0) { + groups = (GID_T *) xmalloc((size_t) (n * sizeof(GID_T))); + n = getgroups((int) n, groups); + while (--n >= 0) + if (groups[n] == statb.st_gid) { + mode <<= 3; + break; + } + } + } +# endif /* NGROUPS_MAX */ + + if (statb.st_mode & mode) + return 0; + else + return 1; +#endif /* !POSIX */ +} + +int +expr(vp) + register Char ***vp; +{ + return (exp0(vp, 0)); +} + +int +exp0(vp, ignore) + register Char ***vp; + bool ignore; +{ + register int p1 = exp1(vp, ignore); + +#ifdef EDEBUG + etraci("exp0 p1", p1, vp); +#endif /* EDEBUG */ + if (**vp && eq(**vp, STRor2)) { + register int p2; + + (*vp)++; + p2 = exp0(vp, (ignore & TEXP_IGNORE) || p1); +#ifdef EDEBUG + etraci("exp0 p2", p2, vp); +#endif /* EDEBUG */ + return (p1 || p2); + } + return (p1); +} + +static int +exp1(vp, ignore) + register Char ***vp; + bool ignore; +{ + register int p1 = exp2(vp, ignore); + +#ifdef EDEBUG + etraci("exp1 p1", p1, vp); +#endif /* EDEBUG */ + if (**vp && eq(**vp, STRand2)) { + register int p2; + + (*vp)++; + p2 = exp1(vp, (ignore & TEXP_IGNORE) || !p1); +#ifdef EDEBUG + etraci("exp1 p2", p2, vp); +#endif /* EDEBUG */ + return (p1 && p2); + } + return (p1); +} + +static int +exp2(vp, ignore) + register Char ***vp; + bool ignore; +{ + register int p1 = exp2a(vp, ignore); + +#ifdef EDEBUG + etraci("exp3 p1", p1, vp); +#endif /* EDEBUG */ + if (**vp && eq(**vp, STRor)) { + register int p2; + + (*vp)++; + p2 = exp2(vp, ignore); +#ifdef EDEBUG + etraci("exp3 p2", p2, vp); +#endif /* EDEBUG */ + return (p1 | p2); + } + return (p1); +} + +static int +exp2a(vp, ignore) + register Char ***vp; + bool ignore; +{ + register int p1 = exp2b(vp, ignore); + +#ifdef EDEBUG + etraci("exp2a p1", p1, vp); +#endif /* EDEBUG */ + if (**vp && eq(**vp, STRcaret)) { + register int p2; + + (*vp)++; + p2 = exp2a(vp, ignore); +#ifdef EDEBUG + etraci("exp2a p2", p2, vp); +#endif /* EDEBUG */ + return (p1 ^ p2); + } + return (p1); +} + +static int +exp2b(vp, ignore) + register Char ***vp; + bool ignore; +{ + register int p1 = exp2c(vp, ignore); + +#ifdef EDEBUG + etraci("exp2b p1", p1, vp); +#endif /* EDEBUG */ + if (**vp && eq(**vp, STRand)) { + register int p2; + + (*vp)++; + p2 = exp2b(vp, ignore); +#ifdef EDEBUG + etraci("exp2b p2", p2, vp); +#endif /* EDEBUG */ + return (p1 & p2); + } + return (p1); +} + +static int +exp2c(vp, ignore) + register Char ***vp; + bool ignore; +{ + register Char *p1 = exp3(vp, ignore); + register Char *p2; + register int i; + +#ifdef EDEBUG + etracc("exp2c p1", p1, vp); +#endif /* EDEBUG */ + if ((i = isa(**vp, EQOP)) != 0) { + (*vp)++; + if (i == EQMATCH || i == NOTEQMATCH) + ignore |= TEXP_NOGLOB; + p2 = exp3(vp, ignore); +#ifdef EDEBUG + etracc("exp2c p2", p2, vp); +#endif /* EDEBUG */ + if (!(ignore & TEXP_IGNORE)) + switch (i) { + + case EQEQ: + i = eq(p1, p2); + break; + + case NOTEQ: + i = !eq(p1, p2); + break; + + case EQMATCH: + i = Gmatch(p1, p2); + break; + + case NOTEQMATCH: + i = !Gmatch(p1, p2); + break; + } + xfree((ptr_t) p1); + xfree((ptr_t) p2); + return (i); + } + i = egetn(p1); + xfree((ptr_t) p1); + return (i); +} + +static Char * +exp3(vp, ignore) + register Char ***vp; + bool ignore; +{ + register Char *p1, *p2; + register int i; + + p1 = exp3a(vp, ignore); +#ifdef EDEBUG + etracc("exp3 p1", p1, vp); +#endif /* EDEBUG */ + if ((i = isa(**vp, RELOP)) != 0) { + (*vp)++; + if (**vp && eq(**vp, STRequal)) + i |= 1, (*vp)++; + p2 = exp3(vp, ignore); +#ifdef EDEBUG + etracc("exp3 p2", p2, vp); +#endif /* EDEBUG */ + if (!(ignore & TEXP_IGNORE)) + switch (i) { + + case GTR: + i = egetn(p1) > egetn(p2); + break; + + case GTR | 1: + i = egetn(p1) >= egetn(p2); + break; + + case LSS: + i = egetn(p1) < egetn(p2); + break; + + case LSS | 1: + i = egetn(p1) <= egetn(p2); + break; + } + xfree((ptr_t) p1); + xfree((ptr_t) p2); + return (putn(i)); + } + return (p1); +} + +static Char * +exp3a(vp, ignore) + register Char ***vp; + bool ignore; +{ + register Char *p1, *p2, *op; + register int i; + + p1 = exp4(vp, ignore); +#ifdef EDEBUG + etracc("exp3a p1", p1, vp); +#endif /* EDEBUG */ + op = **vp; + if (op && any("<>", op[0]) && op[0] == op[1]) { + (*vp)++; + p2 = exp3a(vp, ignore); +#ifdef EDEBUG + etracc("exp3a p2", p2, vp); +#endif /* EDEBUG */ + if (op[0] == '<') + i = egetn(p1) << egetn(p2); + else + i = egetn(p1) >> egetn(p2); + xfree((ptr_t) p1); + xfree((ptr_t) p2); + return (putn(i)); + } + return (p1); +} + +static Char * +exp4(vp, ignore) + register Char ***vp; + bool ignore; +{ + register Char *p1, *p2; + register int i = 0; + + p1 = exp5(vp, ignore); +#ifdef EDEBUG + etracc("exp4 p1", p1, vp); +#endif /* EDEBUG */ + if (isa(**vp, ADDOP)) { + register Char *op = *(*vp)++; + + p2 = exp4(vp, ignore); +#ifdef EDEBUG + etracc("exp4 p2", p2, vp); +#endif /* EDEBUG */ + if (!(ignore & TEXP_IGNORE)) + switch (op[0]) { + + case '+': + i = egetn(p1) + egetn(p2); + break; + + case '-': + i = egetn(p1) - egetn(p2); + break; + } + xfree((ptr_t) p1); + xfree((ptr_t) p2); + return (putn(i)); + } + return (p1); +} + +static Char * +exp5(vp, ignore) + register Char ***vp; + bool ignore; +{ + register Char *p1, *p2; + register int i = 0; + + p1 = exp6(vp, ignore); +#ifdef EDEBUG + etracc("exp5 p1", p1, vp); +#endif /* EDEBUG */ + + if (isa(**vp, MULOP)) { + register Char *op = *(*vp)++; + if ((ignore & TEXP_NOGLOB) != 0) + /* + * We are just trying to get the right side of + * a =~ or !~ operator + */ + return Strsave(op); + + p2 = exp5(vp, ignore); +#ifdef EDEBUG + etracc("exp5 p2", p2, vp); +#endif /* EDEBUG */ + if (!(ignore & TEXP_IGNORE)) + switch (op[0]) { + + case '*': + i = egetn(p1) * egetn(p2); + break; + + case '/': + i = egetn(p2); + if (i == 0) + stderror(ERR_DIV0); + i = egetn(p1) / i; + break; + + case '%': + i = egetn(p2); + if (i == 0) + stderror(ERR_MOD0); + i = egetn(p1) % i; + break; + } + xfree((ptr_t) p1); + xfree((ptr_t) p2); + return (putn(i)); + } + return (p1); +} + +static Char * +exp6(vp, ignore) + register Char ***vp; + bool ignore; +{ + int ccode, i = 0; + register Char *cp; + + if (**vp == 0) + stderror(ERR_NAME | ERR_EXPRESSION); + if (eq(**vp, STRbang)) { + (*vp)++; + cp = exp6(vp, ignore); +#ifdef EDEBUG + etracc("exp6 ! cp", cp, vp); +#endif /* EDEBUG */ + i = egetn(cp); + xfree((ptr_t) cp); + return (putn(!i)); + } + if (eq(**vp, STRtilde)) { + (*vp)++; + cp = exp6(vp, ignore); +#ifdef EDEBUG + etracc("exp6 ~ cp", cp, vp); +#endif /* EDEBUG */ + i = egetn(cp); + xfree((ptr_t) cp); + return (putn(~i)); + } + if (eq(**vp, STRLparen)) { + (*vp)++; + ccode = exp0(vp, ignore); +#ifdef EDEBUG + etraci("exp6 () ccode", ccode, vp); +#endif /* EDEBUG */ + if (*vp == 0 || **vp == 0 || ***vp != ')') + stderror(ERR_NAME | ERR_EXPRESSION); + (*vp)++; + return (putn(ccode)); + } + if (eq(**vp, STRLbrace)) { + register Char **v; + struct command faket; + Char *fakecom[2]; + + faket.t_dtyp = NODE_COMMAND; + faket.t_dflg = F_BACKQ; + faket.t_dcar = faket.t_dcdr = faket.t_dspr = NULL; + faket.t_dcom = fakecom; + fakecom[0] = STRfakecom; + fakecom[1] = NULL; + (*vp)++; + v = *vp; + for (;;) { + if (!**vp) + stderror(ERR_NAME | ERR_MISSING, '}'); + if (eq(*(*vp)++, STRRbrace)) + break; + } + if (ignore & TEXP_IGNORE) + return (Strsave(STRNULL)); + psavejob(); + if (pfork(&faket, -1) == 0) { + *--(*vp) = 0; + evalav(v); + exitstat(); + } + pwait(); + prestjob(); +#ifdef EDEBUG + etraci("exp6 {} status", egetn(varval(STRstatus)), vp); +#endif /* EDEBUG */ + return (putn(egetn(varval(STRstatus)) == 0)); + } + if (isa(**vp, ANYOP)) + return (Strsave(STRNULL)); + cp = *(*vp)++; +#ifdef convex +# define FILETESTS "erwxfdzoplstSXLbcugkmKR" +#else +# define FILETESTS "erwxfdzoplstSXLbcugkmK" +#endif /* convex */ +#define FILEVALS "ZAMCDIUGNFPL" + if (*cp == '-' && (any(FILETESTS, cp[1]) || any(FILEVALS, cp[1]))) + return(filetest(cp, vp, ignore)); +#ifdef EDEBUG + etracc("exp6 default", cp, vp); +#endif /* EDEBUG */ + return (ignore & TEXP_NOGLOB ? Strsave(cp) : globone(cp, G_APPEND)); +} + + +/* + * Extended file tests + * From: John Rowe <rowe@excc.exeter.ac.uk> + */ +Char * +filetest(cp, vp, ignore) + Char *cp, ***vp; + bool ignore; +{ +#ifdef convex + struct cvxstat stb, *st = NULL; +# define TCSH_STAT stat64 +#else +# define TCSH_STAT stat + struct stat stb, *st = NULL; +#endif /* convex */ + +#ifdef S_IFLNK +# ifdef convex + struct cvxstat lstb, *lst = NULL; +# define TCSH_LSTAT lstat64 +# else +# define TCSH_LSTAT lstat + struct stat lstb, *lst = NULL; +# endif /* convex */ + char *filnam; +#endif /* S_IFLNK */ + + int i = 0; + unsigned pmask = 0xffff; + bool altout = 0; + Char *ft = cp, *dp, *ep, *strdev, *strino, *strF, *str, valtest = '\0', + *errval = STR0; + char *string, string0[8]; + time_t footime; + struct passwd *pw; + struct group *gr; + + while(any(FILETESTS, *++ft)) + continue; + + if (!*ft && *(ft - 1) == 'L') + --ft; + + if (any(FILEVALS, *ft)) { + valtest = *ft++; + /* + * Value tests return '-1' on failure as 0 is + * a legitimate value for many of them. + * 'F' returns ':' for compatibility. + */ + errval = valtest == 'F' ? STRcolon : STRminus1; + + if (valtest == 'P' && *ft >= '0' && *ft <= '7') { + pmask = (char) *ft - '0'; + while ( *++ft >= '0' && *ft <= '7' ) + pmask = 8 * pmask + ((char) *ft - '0'); + } + if (Strcmp(ft, STRcolon) == 0 && any("AMCUGP", valtest)) { + altout = 1; + ++ft; + } + } + + if (*ft || ft == cp + 1) + stderror(ERR_NAME | ERR_FILEINQ); + + /* + * Detect missing file names by checking for operator in the file name + * position. However, if an operator name appears there, we must make + * sure that there's no file by that name (e.g., "/") before announcing + * an error. Even this check isn't quite right, since it doesn't take + * globbing into account. + */ + + if (isa(**vp, ANYOP) && TCSH_STAT(short2str(**vp), &stb)) + stderror(ERR_NAME | ERR_FILENAME); + + dp = *(*vp)++; + if (ignore & TEXP_IGNORE) + return (Strsave(STRNULL)); + ep = globone(dp, G_APPEND); + ft = &cp[1]; + do + switch (*ft) { + + case 'r': + i = !sh_access(ep, R_OK); + break; + + case 'w': + i = !sh_access(ep, W_OK); + break; + + case 'x': + i = !sh_access(ep, X_OK); + break; + + case 'X': /* tcsh extension, name is an executable in the path + * or a tcsh builtin command + */ + i = find_cmd(ep, 0); + break; + + case 't': /* SGI extension, true when file is a tty */ + i = isatty(atoi(short2str(ep))); + break; + + default: + +#ifdef S_IFLNK + if (tolower(*ft) == 'l') { + /* + * avoid convex compiler bug. + */ + if (!lst) { + lst = &lstb; + if (TCSH_LSTAT(short2str(ep), lst) == -1) { + xfree((ptr_t) ep); + return (Strsave(errval)); + } + } + if (*ft == 'L') + st = lst; + } + else +#endif /* S_IFLNK */ + /* + * avoid convex compiler bug. + */ + if (!st) { + st = &stb; + if (TCSH_STAT(short2str(ep), st) == -1) { + xfree((ptr_t) ep); + return (Strsave(errval)); + } + } + + switch (*ft) { + + case 'f': +#ifdef S_ISREG + i = S_ISREG(st->st_mode); +#else /* !S_ISREG */ + i = 0; +#endif /* S_ISREG */ + break; + + case 'd': +#ifdef S_ISDIR + i = S_ISDIR(st->st_mode); +#else /* !S_ISDIR */ + i = 0; +#endif /* S_ISDIR */ + break; + + case 'p': +#ifdef S_ISFIFO + i = S_ISFIFO(st->st_mode); +#else /* !S_ISFIFO */ + i = 0; +#endif /* S_ISFIFO */ + break; + + case 'm' : +#ifdef S_ISOFL + i = S_ISOFL(st->st_dm_mode); +#else /* !S_ISOFL */ + i = 0; +#endif /* S_ISOFL */ + break ; + + case 'K' : +#ifdef S_ISOFL + i = stb.st_dm_key; +#else /* !S_ISOFL */ + i = 0; +#endif /* S_ISOFL */ + break ; + + + case 'l': +#ifdef S_ISLNK + i = S_ISLNK(lst->st_mode); +#else /* !S_ISLNK */ + i = 0; +#endif /* S_ISLNK */ + break; + + case 'S': +# ifdef S_ISSOCK + i = S_ISSOCK(st->st_mode); +# else /* !S_ISSOCK */ + i = 0; +# endif /* S_ISSOCK */ + break; + + case 'b': +#ifdef S_ISBLK + i = S_ISBLK(st->st_mode); +#else /* !S_ISBLK */ + i = 0; +#endif /* S_ISBLK */ + break; + + case 'c': +#ifdef S_ISCHR + i = S_ISCHR(st->st_mode); +#else /* !S_ISCHR */ + i = 0; +#endif /* S_ISCHR */ + break; + + case 'u': + i = (S_ISUID & st->st_mode) != 0; + break; + + case 'g': + i = (S_ISGID & st->st_mode) != 0; + break; + + case 'k': + i = (S_ISVTX & st->st_mode) != 0; + break; + + case 'z': + i = st->st_size == 0; + break; + +#ifdef convex + case 'R': + i = (stb.st_dmonflags & IMIGRATED) == IMIGRATED; + break; +#endif /* convex */ + + case 's': + i = stb.st_size != 0; + break; + + case 'e': + i = 1; + break; + + case 'o': + i = st->st_uid == uid; + break; + + /* + * Value operators are a tcsh extension. + */ + + case 'D': + i = (int) st->st_dev; + break; + + case 'I': + i = (int) st->st_ino; + break; + + case 'F': + strdev = putn( (int) st->st_dev); + strino = putn( (int) st->st_ino); + strF = (Char *) xmalloc((size_t) (2 + Strlen(strdev) + + Strlen(strino)) * sizeof(Char)); + (void) Strcat(Strcat(Strcpy(strF, strdev), STRcolon), strino); + xfree((ptr_t) strdev); + xfree((ptr_t) strino); + xfree((ptr_t) ep); + return(strF); + + case 'L': + if ( *(ft + 1) ) { + i = 1; + break; + } +#ifdef S_ISLNK + filnam = short2str(ep); +#ifdef PATH_MAX +# define MY_PATH_MAX PATH_MAX +#else /* !PATH_MAX */ +/* + * I can't think of any more sensible alterative; readlink doesn't give + * us an errno if the buffer isn't large enough :-( + */ +# define MY_PATH_MAX 2048 +#endif /* PATH_MAX */ + i = readlink(filnam, string = (char *) + xmalloc((size_t) (1 + MY_PATH_MAX) * sizeof(char)), + MY_PATH_MAX); + if (i >= 0 && i <= MY_PATH_MAX) + string[i] = '\0'; /* readlink does not null terminate */ + strF = (i < 0) ? errval : str2short(string); + xfree((ptr_t) string); + xfree((ptr_t) ep); + return(Strsave(strF)); + +#else /* !S_ISLNK */ + i = 0; + break; +#endif /* S_ISLNK */ + + + case 'N': + i = (int) st->st_nlink; + break; + + case 'P': + string = string0 + 1; + (void) xsnprintf(string, sizeof(string0) - 1, "%o", + pmask & (unsigned int) + ((S_IRWXU|S_IRWXG|S_IRWXO|S_ISUID|S_ISGID) & st->st_mode)); + if (altout && *string != '0') + *--string = '0'; + xfree((ptr_t) ep); + return(Strsave(str2short(string))); + + case 'U': + if (altout && (pw = getpwuid(st->st_uid))) { + xfree((ptr_t) ep); + return(Strsave(str2short(pw->pw_name))); + } + i = (int) st->st_uid; + break; + + case 'G': + if ( altout && (gr = getgrgid(st->st_gid))) { + xfree((ptr_t) ep); + return(Strsave(str2short(gr->gr_name))); + } + i = (int) st->st_gid; + break; + + case 'Z': + i = (int) st->st_size; + break; + + case 'A': case 'M': case 'C': + footime = *ft == 'A' ? st->st_atime : + *ft == 'M' ? st->st_mtime : st->st_ctime; + if (altout) { + strF = str2short(ctime(&footime)); + if ((str = Strchr(strF, '\n')) != NULL) + *str = (Char) '\0'; + xfree((ptr_t) ep); + return(Strsave(strF)); + } + i = (int) footime; + break; + + } + } + while (*++ft && i); +#ifdef EDEBUG + etraci("exp6 -? i", i, vp); +#endif /* EDEBUG */ + xfree((ptr_t) ep); + return (putn(i)); +} + + +static void +evalav(v) + register Char **v; +{ + struct wordent paraml1; + register struct wordent *hp = ¶ml1; + struct command *t; + register struct wordent *wdp = hp; + + set(STRstatus, Strsave(STR0), VAR_READWRITE); + hp->prev = hp->next = hp; + hp->word = STRNULL; + while (*v) { + register struct wordent *new = + (struct wordent *) xcalloc(1, sizeof *wdp); + + new->prev = wdp; + new->next = hp; + wdp->next = new; + wdp = new; + wdp->word = Strsave(*v++); + } + hp->prev = wdp; + alias(¶ml1); + t = syntax(paraml1.next, ¶ml1, 0); + if (seterr) + stderror(ERR_OLD); + execute(t, -1, NULL, NULL); + freelex(¶ml1), freesyn(t); +} + +static int +isa(cp, what) + register Char *cp; + register int what; +{ + if (cp == 0) + return ((what & RESTOP) != 0); + if (*cp == '\0') + return 0; + if (cp[1] == 0) { + if (what & ADDOP && (*cp == '+' || *cp == '-')) + return (1); + if (what & MULOP && (*cp == '*' || *cp == '/' || *cp == '%')) + return (1); + if (what & RESTOP && (*cp == '(' || *cp == ')' || *cp == '!' || + *cp == '~' || *cp == '^' || *cp == '"')) + return (1); + } + else if (cp[2] == 0) { + if (what & RESTOP) { + if (cp[0] == '|' && cp[1] == '&') + return (1); + if (cp[0] == '<' && cp[1] == '<') + return (1); + if (cp[0] == '>' && cp[1] == '>') + return (1); + } + if (what & EQOP) { + if (cp[0] == '=') { + if (cp[1] == '=') + return (EQEQ); + if (cp[1] == '~') + return (EQMATCH); + } + else if (cp[0] == '!') { + if (cp[1] == '=') + return (NOTEQ); + if (cp[1] == '~') + return (NOTEQMATCH); + } + } + } + if (what & RELOP) { + if (*cp == '<') + return (LSS); + if (*cp == '>') + return (GTR); + } + return (0); +} + +static int +egetn(cp) + register Char *cp; +{ + if (*cp && *cp != '-' && !Isdigit(*cp)) + stderror(ERR_NAME | ERR_EXPRESSION); + return (getn(cp)); +} + +/* Phew! */ + +#ifdef EDEBUG +static void +etraci(str, i, vp) + char *str; + int i; + Char ***vp; +{ + xprintf("%s=%d\t", str, i); + blkpr(*vp); + xputchar('\n'); +} +static void +etracc(str, cp, vp) + char *str; + Char *cp; + Char ***vp; +{ + xprintf("%s=%s\t", str, cp); + blkpr(*vp); + xputchar('\n'); +} +#endif /* EDEBUG */ |