[unix-history] / usr / src / bin / csh / exp.c

/*-
 * Copyright (c) 1980, 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)exp.c	8.1 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef SHORT_STRINGS
#include <string.h>
#endif /* SHORT_STRINGS */
#if __STDC__
# include <stdarg.h>
#else
# include <varargs.h>
#endif

#include "csh.h"
#include "extern.h"

#define IGNORE	1	/* in ignore, it means to ignore value, just parse */
#define 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	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

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
    if (**vp && eq(**vp, STRor2)) {
	register int p2;

	(*vp)++;
	p2 = exp0(vp, (ignore & IGNORE) || p1);
#ifdef EDEBUG
	etraci("exp0 p2", p2, vp);
#endif
	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
    if (**vp && eq(**vp, STRand2)) {
	register int p2;

	(*vp)++;
	p2 = exp1(vp, (ignore & IGNORE) || !p1);
#ifdef EDEBUG
	etraci("exp1 p2", p2, vp);
#endif
	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
    if (**vp && eq(**vp, STRor)) {
	register int p2;

	(*vp)++;
	p2 = exp2(vp, ignore);
#ifdef EDEBUG
	etraci("exp3 p2", p2, vp);
#endif
	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
    if (**vp && eq(**vp, STRcaret)) {
	register int p2;

	(*vp)++;
	p2 = exp2a(vp, ignore);
#ifdef EDEBUG
	etraci("exp2a p2", p2, vp);
#endif
	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
    if (**vp && eq(**vp, STRand)) {
	register int p2;

	(*vp)++;
	p2 = exp2b(vp, ignore);
#ifdef EDEBUG
	etraci("exp2b p2", p2, vp);
#endif
	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
    if ((i = isa(**vp, EQOP)) != 0) {
	(*vp)++;
	if (i == EQMATCH || i == NOTEQMATCH)
	    ignore |= NOGLOB;
	p2 = exp3(vp, ignore);
#ifdef EDEBUG
	etracc("exp2c p2", p2, vp);
#endif
	if (!(ignore & 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
    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
	if (!(ignore & 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
    op = **vp;
    if (op && any("<>", op[0]) && op[0] == op[1]) {
	(*vp)++;
	p2 = exp3a(vp, ignore);
#ifdef EDEBUG
	etracc("exp3a p2", p2, vp);
#endif
	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
    if (isa(**vp, ADDOP)) {
	register Char *op = *(*vp)++;

	p2 = exp4(vp, ignore);
#ifdef EDEBUG
	etracc("exp4 p2", p2, vp);
#endif
	if (!(ignore & 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
    if (isa(**vp, MULOP)) {
	register Char *op = *(*vp)++;

	p2 = exp5(vp, ignore);
#ifdef EDEBUG
	etracc("exp5 p2", p2, vp);
#endif
	if (!(ignore & 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, *dp, *ep;

    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
	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
	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
	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 = 0;
	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 & IGNORE)
	    return (Strsave(STRNULL));
	psavejob();
	if (pfork(&faket, -1) == 0) {
	    *--(*vp) = 0;
	    evalav(v);
	    exitstat();
	}
	pwait();
	prestjob();
#ifdef EDEBUG
	etraci("exp6 {} status", egetn(value(STRstatus)), vp);
#endif
	return (putn(egetn(value(STRstatus)) == 0));
    }
    if (isa(**vp, ANYOP))
	return (Strsave(STRNULL));
    cp = *(*vp)++;
    if (*cp == '-' && any("erwxfdzopls", cp[1])) {
	struct stat stb;

	if (cp[2] != '\0')
	    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) && stat(short2str(**vp), &stb))
	    stderror(ERR_NAME | ERR_FILENAME);

	dp = *(*vp)++;
	if (ignore & IGNORE)
	    return (Strsave(STRNULL));
	ep = globone(dp, G_ERROR);
	switch (cp[1]) {

	case 'r':
	    i = !access(short2str(ep), R_OK);
	    break;

	case 'w':
	    i = !access(short2str(ep), W_OK);
	    break;

	case 'x':
	    i = !access(short2str(ep), X_OK);
	    break;

	default:
	    if (
#ifdef S_IFLNK
		cp[1] == 'l' ? lstat(short2str(ep), &stb) :
#endif
		stat(short2str(ep), &stb)) {
		xfree((ptr_t) ep);
		return (Strsave(STR0));
	    }
	    switch (cp[1]) {

	    case 'f':
		i = S_ISREG(stb.st_mode);
		break;

	    case 'd':
		i = S_ISDIR(stb.st_mode);
		break;

	    case 'p':
#ifdef S_ISFIFO
		i = S_ISFIFO(stb.st_mode);
#else
		i = 0;
#endif
		break;

	    case 'l':
#ifdef S_ISLNK
		i = S_ISLNK(stb.st_mode);
#else
		i = 0;
#endif
		break;

	    case 's':
#ifdef S_ISSOCK
		i = S_ISSOCK(stb.st_mode);
#else
		i = 0;
#endif
		break;

	    case 'z':
		i = stb.st_size == 0;
		break;

	    case 'e':
		i = 1;
		break;

	    case 'o':
		i = stb.st_uid == uid;
		break;
	    }
	}
#ifdef EDEBUG
	etraci("exp6 -? i", i, vp);
#endif
	xfree((ptr_t) ep);
	return (putn(i));
    }
#ifdef EDEBUG
    etracc("exp6 default", cp, vp);
#endif
    return (ignore & NOGLOB ? Strsave(cp) : globone(cp, G_ERROR));
}

static void
evalav(v)
    register Char **v;
{
    struct wordent paraml1;
    register struct wordent *hp = &paraml1;
    struct command *t;
    register struct wordent *wdp = hp;

    set(STRstatus, Strsave(STR0));
    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(&paraml1);
    t = syntax(paraml1.next, &paraml1, 0);
    if (seterr)
	stderror(ERR_OLD);
    execute(t, -1, NULL, NULL);
    freelex(&paraml1), freesyn(t);
}

static int
isa(cp, what)
    register Char *cp;
    register int what;
{
    if (cp == 0)
	return ((what & RESTOP) != 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;
{
    (void) fprintf(csherr, "%s=%d\t", str, i);
    blkpr(csherr, *vp);
    (void) fprintf(csherr, "\n");
}
static void
etracc(str, cp, vp)
    char   *str;
    Char   *cp;
    Char ***vp;
{
    (void) fprintf(csherr, "%s=%s\t", str, vis_str(cp));
    blkpr(csherr, *vp);
    (void) fprintf(csherr, "\n");
}
#endif
Commit	Line	Data
ecc449eb	1	/*-
ed72f0a0 KB	2	* Copyright (c) 1980, 1991, 1993
ed72f0a0 KB	3	* The Regents of the University of California. All rights reserved.
ecc449eb KB	4	*
ecc449eb KB	5	* %sccs.include.redist.c%
b79f4fa9 DF	6	*/
b79f4fa9 DF	7
35371dec	8	#ifndef lint
ed72f0a0	9	static char sccsid[] = "@(#)exp.c 8.1 (Berkeley) %G%";
ecc449eb	10	#endif /* not lint */
843d5d49	11
b9c4f741 KB	12	#include <sys/types.h>
	13	#include <sys/stat.h>
	14	#include <stdlib.h>
	15	#include <unistd.h>
8e3354ca CZ	16	#ifndef SHORT_STRINGS
	17	#include <string.h>
	18	#endif /* SHORT_STRINGS */
4df6491c CZ	19	#if __STDC__
	20	# include <stdarg.h>
	21	#else
	22	# include <varargs.h>
	23	#endif
	24
4d7b2685	25	#include "csh.h"
4d7b2685	26	#include "extern.h"
843d5d49	27
843d5d49 BJ	28	#define IGNORE 1 /* in ignore, it means to ignore value, just parse */
	29	#define NOGLOB 2 /* in ignore, it means not to globone */
	30
	31	#define ADDOP 1
	32	#define MULOP 2
	33	#define EQOP 4
	34	#define RELOP 8
	35	#define RESTOP 16
	36	#define ANYOP 31
	37
	38	#define EQEQ 1
	39	#define GTR 2
	40	#define LSS 4
	41	#define NOTEQ 6
	42	#define EQMATCH 7
	43	#define NOTEQMATCH 8
	44
0aec749d CZ	45	static int exp1 __P((Char ***, bool));
	46	static int exp2 __P((Char ***, bool));
	47	static int exp2a __P((Char ***, bool));
	48	static int exp2b __P((Char ***, bool));
	49	static int exp2c __P((Char ***, bool));
	50	static Char * exp3 __P((Char ***, bool));
	51	static Char * exp3a __P((Char ***, bool));
	52	static Char * exp4 __P((Char ***, bool));
	53	static Char * exp5 __P((Char ***, bool));
	54	static Char * exp6 __P((Char ***, bool));
	55	static void evalav __P((Char **));
	56	static int isa __P((Char *, int));
	57	static int egetn __P((Char *));
6e37afca KB	58
6e37afca KB	59	#ifdef EDEBUG
0aec749d CZ	60	static void etracc __P((char , Char , Char ***));
0aec749d CZ	61	static void etraci __P((char , int, Char **));
6e37afca KB	62	#endif
	63
	64	int
c96f7f99	65	expr(vp)
6e37afca	66	register Char ***vp;
843d5d49	67	{
6e37afca	68	return (exp0(vp, 0));
843d5d49 BJ	69	}
843d5d49 BJ	70
6e37afca	71	int
843d5d49	72	exp0(vp, ignore)
6e37afca KB	73	register Char ***vp;
6e37afca KB	74	bool ignore;
843d5d49	75	{
6e37afca KB	76	register int p1 = exp1(vp, ignore);
6e37afca KB	77
843d5d49	78	#ifdef EDEBUG
6e37afca	79	etraci("exp0 p1", p1, vp);
843d5d49	80	#endif
6e37afca KB	81	if (vp && eq(vp, STRor2)) {
6e37afca KB	82	register int p2;
843d5d49	83
6e37afca KB	84	(*vp)++;
6e37afca KB	85	p2 = exp0(vp, (ignore & IGNORE) \|\| p1);
843d5d49	86	#ifdef EDEBUG
6e37afca	87	etraci("exp0 p2", p2, vp);
843d5d49	88	#endif
6e37afca KB	89	return (p1 \|\| p2);
	90	}
	91	return (p1);
843d5d49 BJ	92	}
843d5d49 BJ	93
6e37afca	94	static int
843d5d49	95	exp1(vp, ignore)
6e37afca KB	96	register Char ***vp;
6e37afca KB	97	bool ignore;
843d5d49	98	{
6e37afca	99	register int p1 = exp2(vp, ignore);
843d5d49 BJ	100
843d5d49 BJ	101	#ifdef EDEBUG
6e37afca	102	etraci("exp1 p1", p1, vp);
843d5d49	103	#endif
6e37afca KB	104	if (vp && eq(vp, STRand2)) {
6e37afca KB	105	register int p2;
843d5d49	106
6e37afca KB	107	(*vp)++;
6e37afca KB	108	p2 = exp1(vp, (ignore & IGNORE) \|\| !p1);
843d5d49	109	#ifdef EDEBUG
6e37afca	110	etraci("exp1 p2", p2, vp);
843d5d49	111	#endif
6e37afca KB	112	return (p1 && p2);
	113	}
	114	return (p1);
843d5d49 BJ	115	}
843d5d49 BJ	116
6e37afca	117	static int
843d5d49	118	exp2(vp, ignore)
6e37afca KB	119	register Char ***vp;
6e37afca KB	120	bool ignore;
843d5d49	121	{
6e37afca	122	register int p1 = exp2a(vp, ignore);
843d5d49 BJ	123
843d5d49 BJ	124	#ifdef EDEBUG
6e37afca	125	etraci("exp3 p1", p1, vp);
843d5d49	126	#endif
6e37afca KB	127	if (vp && eq(vp, STRor)) {
6e37afca KB	128	register int p2;
843d5d49	129
6e37afca KB	130	(*vp)++;
6e37afca KB	131	p2 = exp2(vp, ignore);
843d5d49	132	#ifdef EDEBUG
6e37afca	133	etraci("exp3 p2", p2, vp);
843d5d49	134	#endif
6e37afca KB	135	return (p1 \| p2);
	136	}
	137	return (p1);
843d5d49 BJ	138	}
843d5d49 BJ	139
6e37afca	140	static int
843d5d49	141	exp2a(vp, ignore)
6e37afca KB	142	register Char ***vp;
6e37afca KB	143	bool ignore;
843d5d49	144	{
6e37afca	145	register int p1 = exp2b(vp, ignore);
843d5d49 BJ	146
843d5d49 BJ	147	#ifdef EDEBUG
6e37afca	148	etraci("exp2a p1", p1, vp);
843d5d49	149	#endif
6e37afca KB	150	if (vp && eq(vp, STRcaret)) {
6e37afca KB	151	register int p2;
843d5d49	152
6e37afca KB	153	(*vp)++;
6e37afca KB	154	p2 = exp2a(vp, ignore);
843d5d49	155	#ifdef EDEBUG
6e37afca	156	etraci("exp2a p2", p2, vp);
843d5d49	157	#endif
6e37afca KB	158	return (p1 ^ p2);
	159	}
	160	return (p1);
843d5d49 BJ	161	}
843d5d49 BJ	162
6e37afca	163	static int
843d5d49	164	exp2b(vp, ignore)
6e37afca KB	165	register Char ***vp;
6e37afca KB	166	bool ignore;
843d5d49	167	{
6e37afca	168	register int p1 = exp2c(vp, ignore);
843d5d49 BJ	169
843d5d49 BJ	170	#ifdef EDEBUG
6e37afca	171	etraci("exp2b p1", p1, vp);
843d5d49	172	#endif
6e37afca KB	173	if (vp && eq(vp, STRand)) {
6e37afca KB	174	register int p2;
843d5d49	175
6e37afca KB	176	(*vp)++;
6e37afca KB	177	p2 = exp2b(vp, ignore);
843d5d49	178	#ifdef EDEBUG
6e37afca	179	etraci("exp2b p2", p2, vp);
843d5d49	180	#endif
6e37afca KB	181	return (p1 & p2);
	182	}
	183	return (p1);
843d5d49 BJ	184	}
843d5d49 BJ	185
6e37afca	186	static int
843d5d49	187	exp2c(vp, ignore)
6e37afca KB	188	register Char ***vp;
6e37afca KB	189	bool ignore;
843d5d49	190	{
6e37afca KB	191	register Char *p1 = exp3(vp, ignore);
	192	register Char *p2;
	193	register int i;
843d5d49 BJ	194
843d5d49 BJ	195	#ifdef EDEBUG
6e37afca	196	etracc("exp2c p1", p1, vp);
843d5d49	197	#endif
37999c01	198	if ((i = isa(**vp, EQOP)) != 0) {
6e37afca KB	199	(*vp)++;
	200	if (i == EQMATCH \|\| i == NOTEQMATCH)
	201	ignore \|= NOGLOB;
	202	p2 = exp3(vp, ignore);
843d5d49	203	#ifdef EDEBUG
6e37afca	204	etracc("exp2c p2", p2, vp);
843d5d49	205	#endif
6e37afca KB	206	if (!(ignore & IGNORE))
	207	switch (i) {
	208
	209	case EQEQ:
	210	i = eq(p1, p2);
	211	break;
	212
	213	case NOTEQ:
	214	i = !eq(p1, p2);
	215	break;
	216
	217	case EQMATCH:
	218	i = Gmatch(p1, p2);
	219	break;
	220
	221	case NOTEQMATCH:
	222	i = !Gmatch(p1, p2);
	223	break;
	224	}
	225	xfree((ptr_t) p1);
	226	xfree((ptr_t) p2);
843d5d49	227	return (i);
6e37afca KB	228	}
	229	i = egetn(p1);
	230	xfree((ptr_t) p1);
	231	return (i);
843d5d49 BJ	232	}
843d5d49 BJ	233
6e37afca	234	static Char *
843d5d49	235	exp3(vp, ignore)
6e37afca KB	236	register Char ***vp;
6e37afca KB	237	bool ignore;
843d5d49	238	{
6e37afca KB	239	register Char p1, p2;
6e37afca KB	240	register int i;
843d5d49	241
6e37afca	242	p1 = exp3a(vp, ignore);
843d5d49	243	#ifdef EDEBUG
6e37afca	244	etracc("exp3 p1", p1, vp);
843d5d49	245	#endif
37999c01	246	if ((i = isa(**vp, RELOP)) != 0) {
6e37afca KB	247	(*vp)++;
	248	if (vp && eq(vp, STRequal))
	249	i \|= 1, (*vp)++;
	250	p2 = exp3(vp, ignore);
843d5d49	251	#ifdef EDEBUG
6e37afca	252	etracc("exp3 p2", p2, vp);
843d5d49	253	#endif
6e37afca KB	254	if (!(ignore & IGNORE))
	255	switch (i) {
	256
	257	case GTR:
	258	i = egetn(p1) > egetn(p2);
	259	break;
	260
	261	case GTR \| 1:
	262	i = egetn(p1) >= egetn(p2);
	263	break;
	264
	265	case LSS:
	266	i = egetn(p1) < egetn(p2);
	267	break;
	268
	269	case LSS \| 1:
	270	i = egetn(p1) <= egetn(p2);
	271	break;
	272	}
	273	xfree((ptr_t) p1);
	274	xfree((ptr_t) p2);
	275	return (putn(i));
	276	}
	277	return (p1);
843d5d49 BJ	278	}
843d5d49 BJ	279
6e37afca	280	static Char *
843d5d49	281	exp3a(vp, ignore)
6e37afca KB	282	register Char ***vp;
6e37afca KB	283	bool ignore;
843d5d49	284	{
6e37afca KB	285	register Char p1, p2, *op;
6e37afca KB	286	register int i;
843d5d49	287
6e37afca	288	p1 = exp4(vp, ignore);
843d5d49	289	#ifdef EDEBUG
6e37afca	290	etracc("exp3a p1", p1, vp);
843d5d49	291	#endif
6e37afca KB	292	op = **vp;
	293	if (op && any("<>", op[0]) && op[0] == op[1]) {
	294	(*vp)++;
	295	p2 = exp3a(vp, ignore);
843d5d49	296	#ifdef EDEBUG
6e37afca KB	297	etracc("exp3a p2", p2, vp);
	298	#endif
	299	if (op[0] == '<')
	300	i = egetn(p1) << egetn(p2);
	301	else
	302	i = egetn(p1) >> egetn(p2);
	303	xfree((ptr_t) p1);
	304	xfree((ptr_t) p2);
	305	return (putn(i));
	306	}
	307	return (p1);
843d5d49 BJ	308	}
843d5d49 BJ	309
6e37afca	310	static Char *
843d5d49	311	exp4(vp, ignore)
6e37afca KB	312	register Char ***vp;
6e37afca KB	313	bool ignore;
843d5d49	314	{
6e37afca KB	315	register Char p1, p2;
6e37afca KB	316	register int i = 0;
843d5d49	317
6e37afca	318	p1 = exp5(vp, ignore);
843d5d49	319	#ifdef EDEBUG
6e37afca	320	etracc("exp4 p1", p1, vp);
843d5d49	321	#endif
6e37afca KB	322	if (isa(**vp, ADDOP)) {
6e37afca KB	323	register Char op = (*vp)++;
843d5d49	324
6e37afca	325	p2 = exp4(vp, ignore);
843d5d49	326	#ifdef EDEBUG
6e37afca	327	etracc("exp4 p2", p2, vp);
843d5d49	328	#endif
6e37afca KB	329	if (!(ignore & IGNORE))
	330	switch (op[0]) {
	331
	332	case '+':
	333	i = egetn(p1) + egetn(p2);
	334	break;
	335
	336	case '-':
	337	i = egetn(p1) - egetn(p2);
	338	break;
	339	}
	340	xfree((ptr_t) p1);
	341	xfree((ptr_t) p2);
	342	return (putn(i));
	343	}
	344	return (p1);
843d5d49 BJ	345	}
843d5d49 BJ	346
6e37afca	347	static Char *
843d5d49	348	exp5(vp, ignore)
6e37afca KB	349	register Char ***vp;
6e37afca KB	350	bool ignore;
843d5d49	351	{
6e37afca KB	352	register Char p1, p2;
6e37afca KB	353	register int i = 0;
843d5d49	354
6e37afca	355	p1 = exp6(vp, ignore);
843d5d49	356	#ifdef EDEBUG
6e37afca	357	etracc("exp5 p1", p1, vp);
843d5d49	358	#endif
6e37afca KB	359	if (isa(**vp, MULOP)) {
6e37afca KB	360	register Char op = (*vp)++;
843d5d49	361
6e37afca	362	p2 = exp5(vp, ignore);
843d5d49	363	#ifdef EDEBUG
6e37afca KB	364	etracc("exp5 p2", p2, vp);
	365	#endif
	366	if (!(ignore & IGNORE))
	367	switch (op[0]) {
	368
	369	case '*':
	370	i = egetn(p1) * egetn(p2);
	371	break;
	372
	373	case '/':
	374	i = egetn(p2);
	375	if (i == 0)
	376	stderror(ERR_DIV0);
	377	i = egetn(p1) / i;
	378	break;
	379
	380	case '%':
	381	i = egetn(p2);
	382	if (i == 0)
	383	stderror(ERR_MOD0);
	384	i = egetn(p1) % i;
	385	break;
	386	}
	387	xfree((ptr_t) p1);
	388	xfree((ptr_t) p2);
	389	return (putn(i));
	390	}
	391	return (p1);
843d5d49 BJ	392	}
843d5d49 BJ	393
6e37afca	394	static Char *
843d5d49	395	exp6(vp, ignore)
6e37afca KB	396	register Char ***vp;
6e37afca KB	397	bool ignore;
843d5d49	398	{
6e37afca KB	399	int ccode, i = 0;
	400	register Char cp, dp, *ep;
	401
	402	if (**vp == 0)
	403	stderror(ERR_NAME \| ERR_EXPRESSION);
	404	if (eq(**vp, STRbang)) {
	405	(*vp)++;
	406	cp = exp6(vp, ignore);
843d5d49	407	#ifdef EDEBUG
6e37afca	408	etracc("exp6 ! cp", cp, vp);
843d5d49	409	#endif
6e37afca KB	410	i = egetn(cp);
	411	xfree((ptr_t) cp);
	412	return (putn(!i));
	413	}
	414	if (eq(**vp, STRtilde)) {
	415	(*vp)++;
	416	cp = exp6(vp, ignore);
843d5d49	417	#ifdef EDEBUG
6e37afca	418	etracc("exp6 ~ cp", cp, vp);
843d5d49	419	#endif
6e37afca KB	420	i = egetn(cp);
	421	xfree((ptr_t) cp);
	422	return (putn(~i));
	423	}
	424	if (eq(**vp, STRLparen)) {
	425	(*vp)++;
	426	ccode = exp0(vp, ignore);
843d5d49	427	#ifdef EDEBUG
6e37afca	428	etraci("exp6 () ccode", ccode, vp);
843d5d49	429	#endif
6e37afca KB	430	if (vp == 0 \|\| vp == 0 \|\| **vp != ')')
	431	stderror(ERR_NAME \| ERR_EXPRESSION);
	432	(*vp)++;
	433	return (putn(ccode));
	434	}
	435	if (eq(**vp, STRLbrace)) {
	436	register Char **v;
	437	struct command faket;
	438	Char *fakecom[2];
	439
	440	faket.t_dtyp = NODE_COMMAND;
	441	faket.t_dflg = 0;
0aec749d	442	faket.t_dcar = faket.t_dcdr = faket.t_dspr = NULL;
6e37afca KB	443	faket.t_dcom = fakecom;
	444	fakecom[0] = STRfakecom;
	445	fakecom[1] = NULL;
	446	(*vp)++;
	447	v = *vp;
	448	for (;;) {
	449	if (!**vp)
	450	stderror(ERR_NAME \| ERR_MISSING, '}');
	451	if (eq((vp)++, STRRbrace))
	452	break;
	453	}
	454	if (ignore & IGNORE)
	455	return (Strsave(STRNULL));
	456	psavejob();
	457	if (pfork(&faket, -1) == 0) {
	458	--(vp) = 0;
	459	evalav(v);
	460	exitstat();
843d5d49	461	}
6e37afca KB	462	pwait();
6e37afca KB	463	prestjob();
843d5d49	464	#ifdef EDEBUG
6e37afca KB	465	etraci("exp6 {} status", egetn(value(STRstatus)), vp);
	466	#endif
	467	return (putn(egetn(value(STRstatus)) == 0));
	468	}
	469	if (isa(**vp, ANYOP))
	470	return (Strsave(STRNULL));
	471	cp = (vp)++;
	472	if (*cp == '-' && any("erwxfdzopls", cp[1])) {
	473	struct stat stb;
	474
	475	if (cp[2] != '\0')
	476	stderror(ERR_NAME \| ERR_FILEINQ);
	477	/*
	478	* Detect missing file names by checking for operator in the file name
	479	* position. However, if an operator name appears there, we must make
	480	* sure that there's no file by that name (e.g., "/") before announcing
	481	* an error. Even this check isn't quite right, since it doesn't take
	482	* globbing into account.
	483	*/
	484	if (isa(vp, ANYOP) && stat(short2str(vp), &stb))
	485	stderror(ERR_NAME \| ERR_FILENAME);
	486
	487	dp = (vp)++;
	488	if (ignore & IGNORE)
	489	return (Strsave(STRNULL));
	490	ep = globone(dp, G_ERROR);
	491	switch (cp[1]) {
	492
	493	case 'r':
	494	i = !access(short2str(ep), R_OK);
	495	break;
	496
	497	case 'w':
	498	i = !access(short2str(ep), W_OK);
	499	break;
	500
	501	case 'x':
	502	i = !access(short2str(ep), X_OK);
	503	break;
	504
	505	default:
	506	if (
	507	#ifdef S_IFLNK
	508	cp[1] == 'l' ? lstat(short2str(ep), &stb) :
	509	#endif
	510	stat(short2str(ep), &stb)) {
	511	xfree((ptr_t) ep);
	512	return (Strsave(STR0));
	513	}
	514	switch (cp[1]) {
	515
	516	case 'f':
	517	i = S_ISREG(stb.st_mode);
	518	break;
	519
	520	case 'd':
	521	i = S_ISDIR(stb.st_mode);
	522	break;
	523
	524	case 'p':
	525	#ifdef S_ISFIFO
	526	i = S_ISFIFO(stb.st_mode);
	527	#else
	528	i = 0;
529	#endif
530	break;
531
532	case 'l':
533	#ifdef S_ISLNK
534	i = S_ISLNK(stb.st_mode);
535	#else
536	i = 0;
843d5d49	537	#endif
6e37afca KB	538	break;
	539
	540	case 's':
	541	#ifdef S_ISSOCK
	542	i = S_ISSOCK(stb.st_mode);
	543	#else
	544	i = 0;
	545	#endif
	546	break;
	547
	548	case 'z':
	549	i = stb.st_size == 0;
	550	break;
	551
	552	case 'e':
	553	i = 1;
	554	break;
	555
	556	case 'o':
	557	i = stb.st_uid == uid;
	558	break;
	559	}
843d5d49	560	}
843d5d49	561	#ifdef EDEBUG
6e37afca	562	etraci("exp6 -? i", i, vp);
843d5d49	563	#endif
6e37afca KB	564	xfree((ptr_t) ep);
	565	return (putn(i));
	566	}
843d5d49	567	#ifdef EDEBUG
6e37afca	568	etracc("exp6 default", cp, vp);
843d5d49	569	#endif
6e37afca	570	return (ignore & NOGLOB ? Strsave(cp) : globone(cp, G_ERROR));
843d5d49 BJ	571	}
843d5d49 BJ	572
6e37afca	573	static void
843d5d49	574	evalav(v)
6e37afca	575	register Char **v;
843d5d49	576	{
6e37afca KB	577	struct wordent paraml1;
	578	register struct wordent *hp = &paraml1;
	579	struct command *t;
	580	register struct wordent *wdp = hp;
	581
	582	set(STRstatus, Strsave(STR0));
	583	hp->prev = hp->next = hp;
	584	hp->word = STRNULL;
	585	while (*v) {
	586	register struct wordent *new =
	587	(struct wordent ) xcalloc(1, sizeof wdp);
	588
	589	new->prev = wdp;
	590	new->next = hp;
	591	wdp->next = new;
	592	wdp = new;
	593	wdp->word = Strsave(*v++);
	594	}
	595	hp->prev = wdp;
	596	alias(&paraml1);
	597	t = syntax(paraml1.next, &paraml1, 0);
	598	if (seterr)
	599	stderror(ERR_OLD);
4d7b2685	600	execute(t, -1, NULL, NULL);
6e37afca	601	freelex(&paraml1), freesyn(t);
843d5d49 BJ	602	}
843d5d49 BJ	603
6e37afca	604	static int
843d5d49	605	isa(cp, what)
6e37afca KB	606	register Char *cp;
6e37afca KB	607	register int what;
843d5d49	608	{
6e37afca KB	609	if (cp == 0)
	610	return ((what & RESTOP) != 0);
	611	if (cp[1] == 0) {
	612	if (what & ADDOP && (cp == '+' \|\| cp == '-'))
	613	return (1);
	614	if (what & MULOP && (cp == '' \|\| cp == '/' \|\| cp == '%'))
	615	return (1);
	616	if (what & RESTOP && (cp == '(' \|\| cp == ')' \|\| *cp == '!' \|\|
	617	cp == '~' \|\| cp == '^' \|\| *cp == '"'))
	618	return (1);
	619	}
	620	else if (cp[2] == 0) {
	621	if (what & RESTOP) {
	622	if (cp[0] == '\|' && cp[1] == '&')
	623	return (1);
	624	if (cp[0] == '<' && cp[1] == '<')
	625	return (1);
	626	if (cp[0] == '>' && cp[1] == '>')
	627	return (1);
843d5d49	628	}
6e37afca KB	629	if (what & EQOP) {
	630	if (cp[0] == '=') {
	631	if (cp[1] == '=')
	632	return (EQEQ);
	633	if (cp[1] == '~')
	634	return (EQMATCH);
	635	}
	636	else if (cp[0] == '!') {
	637	if (cp[1] == '=')
	638	return (NOTEQ);
	639	if (cp[1] == '~')
	640	return (NOTEQMATCH);
	641	}
843d5d49	642	}
6e37afca KB	643	}
	644	if (what & RELOP) {
	645	if (*cp == '<')
	646	return (LSS);
	647	if (*cp == '>')
	648	return (GTR);
	649	}
	650	return (0);
843d5d49 BJ	651	}
843d5d49 BJ	652
6e37afca	653	static int
843d5d49	654	egetn(cp)
6e37afca	655	register Char *cp;
843d5d49	656	{
6e37afca KB	657	if (cp && cp != '-' && !Isdigit(*cp))
	658	stderror(ERR_NAME \| ERR_EXPRESSION);
	659	return (getn(cp));
843d5d49 BJ	660	}
	661
	662	/* Phew! */
	663
	664	#ifdef EDEBUG
6e37afca	665	static void
843d5d49	666	etraci(str, i, vp)
6e37afca KB	667	char *str;
	668	int i;
	669	Char ***vp;
843d5d49	670	{
454c2aa3 CZ	671	(void) fprintf(csherr, "%s=%d\t", str, i);
	672	blkpr(csherr, *vp);
	673	(void) fprintf(csherr, "\n");
843d5d49	674	}
6e37afca	675	static void
843d5d49	676	etracc(str, cp, vp)
6e37afca KB	677	char *str;
	678	Char *cp;
	679	Char ***vp;
843d5d49	680	{
abf583a4	681	(void) fprintf(csherr, "%s=%s\t", str, vis_str(cp));
454c2aa3 CZ	682	blkpr(csherr, *vp);
454c2aa3 CZ	683	(void) fprintf(csherr, "\n");
843d5d49 BJ	684	}
843d5d49 BJ	685	#endif