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

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

#ifndef lint
static char sccsid[] = "@(#)exp.c	5.7 (Berkeley) %G%";
#endif /* not lint */

#include "sh.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();
static int exp2();
static int exp2a();
static int exp2b();
static int exp2c();
static Char *exp3();
static Char *exp3a();
static Char *exp4();
static Char *exp5();
static Char *exp6();
static void evalav();
static int isa();
static int egetn();

#ifdef EDEBUG
static void etracc();
static void etraci();
#endif

int
exp(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)) {
	(*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)) {
	(*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 =
	    (struct command *) 0;
	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);
    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;
{
    xprintf("%s=%d\t", str, i);
    blkpr(*vp);
    xprintf("\n");
}
static void
etracc(str, cp, vp)
    char   *str;
    Char   *cp;
    Char ***vp;
{
    xprintf("%s=%s\t", str, cp);
    blkpr(*vp);
    xprintf("\n");
}
#endif
Commit	Line	Data
ecc449eb KB	1	/*-
	2	* Copyright (c) 1980, 1991 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* %sccs.include.redist.c%
b79f4fa9 DF	6	*/
b79f4fa9 DF	7
35371dec	8	#ifndef lint
6e37afca	9	static char sccsid[] = "@(#)exp.c 5.7 (Berkeley) %G%";
ecc449eb	10	#endif /* not lint */
843d5d49 BJ	11
	12	#include "sh.h"
	13
843d5d49 BJ	14	#define IGNORE 1 /* in ignore, it means to ignore value, just parse */
	15	#define NOGLOB 2 /* in ignore, it means not to globone */
	16
	17	#define ADDOP 1
	18	#define MULOP 2
	19	#define EQOP 4
	20	#define RELOP 8
	21	#define RESTOP 16
	22	#define ANYOP 31
	23
	24	#define EQEQ 1
	25	#define GTR 2
	26	#define LSS 4
	27	#define NOTEQ 6
	28	#define EQMATCH 7
	29	#define NOTEQMATCH 8
	30
6e37afca KB	31	static int exp1();
	32	static int exp2();
	33	static int exp2a();
	34	static int exp2b();
	35	static int exp2c();
	36	static Char *exp3();
	37	static Char *exp3a();
	38	static Char *exp4();
	39	static Char *exp5();
	40	static Char *exp6();
	41	static void evalav();
	42	static int isa();
	43	static int egetn();
	44
	45	#ifdef EDEBUG
	46	static void etracc();
	47	static void etraci();
	48	#endif
	49
	50	int
843d5d49	51	exp(vp)
6e37afca	52	register Char ***vp;
843d5d49	53	{
6e37afca	54	return (exp0(vp, 0));
843d5d49 BJ	55	}
843d5d49 BJ	56
6e37afca	57	int
843d5d49	58	exp0(vp, ignore)
6e37afca KB	59	register Char ***vp;
6e37afca KB	60	bool ignore;
843d5d49	61	{
6e37afca KB	62	register int p1 = exp1(vp, ignore);
6e37afca KB	63
843d5d49	64	#ifdef EDEBUG
6e37afca	65	etraci("exp0 p1", p1, vp);
843d5d49	66	#endif
6e37afca KB	67	if (vp && eq(vp, STRor2)) {
6e37afca KB	68	register int p2;
843d5d49	69
6e37afca KB	70	(*vp)++;
6e37afca KB	71	p2 = exp0(vp, (ignore & IGNORE) \|\| p1);
843d5d49	72	#ifdef EDEBUG
6e37afca	73	etraci("exp0 p2", p2, vp);
843d5d49	74	#endif
6e37afca KB	75	return (p1 \|\| p2);
	76	}
	77	return (p1);
843d5d49 BJ	78	}
843d5d49 BJ	79
6e37afca	80	static int
843d5d49	81	exp1(vp, ignore)
6e37afca KB	82	register Char ***vp;
6e37afca KB	83	bool ignore;
843d5d49	84	{
6e37afca	85	register int p1 = exp2(vp, ignore);
843d5d49 BJ	86
843d5d49 BJ	87	#ifdef EDEBUG
6e37afca	88	etraci("exp1 p1", p1, vp);
843d5d49	89	#endif
6e37afca KB	90	if (vp && eq(vp, STRand2)) {
6e37afca KB	91	register int p2;
843d5d49	92
6e37afca KB	93	(*vp)++;
6e37afca KB	94	p2 = exp1(vp, (ignore & IGNORE) \|\| !p1);
843d5d49	95	#ifdef EDEBUG
6e37afca	96	etraci("exp1 p2", p2, vp);
843d5d49	97	#endif
6e37afca KB	98	return (p1 && p2);
	99	}
	100	return (p1);
843d5d49 BJ	101	}
843d5d49 BJ	102
6e37afca	103	static int
843d5d49	104	exp2(vp, ignore)
6e37afca KB	105	register Char ***vp;
6e37afca KB	106	bool ignore;
843d5d49	107	{
6e37afca	108	register int p1 = exp2a(vp, ignore);
843d5d49 BJ	109
843d5d49 BJ	110	#ifdef EDEBUG
6e37afca	111	etraci("exp3 p1", p1, vp);
843d5d49	112	#endif
6e37afca KB	113	if (vp && eq(vp, STRor)) {
6e37afca KB	114	register int p2;
843d5d49	115
6e37afca KB	116	(*vp)++;
6e37afca KB	117	p2 = exp2(vp, ignore);
843d5d49	118	#ifdef EDEBUG
6e37afca	119	etraci("exp3 p2", p2, vp);
843d5d49	120	#endif
6e37afca KB	121	return (p1 \| p2);
	122	}
	123	return (p1);
843d5d49 BJ	124	}
843d5d49 BJ	125
6e37afca	126	static int
843d5d49	127	exp2a(vp, ignore)
6e37afca KB	128	register Char ***vp;
6e37afca KB	129	bool ignore;
843d5d49	130	{
6e37afca	131	register int p1 = exp2b(vp, ignore);
843d5d49 BJ	132
843d5d49 BJ	133	#ifdef EDEBUG
6e37afca	134	etraci("exp2a p1", p1, vp);
843d5d49	135	#endif
6e37afca KB	136	if (vp && eq(vp, STRcaret)) {
6e37afca KB	137	register int p2;
843d5d49	138
6e37afca KB	139	(*vp)++;
6e37afca KB	140	p2 = exp2a(vp, ignore);
843d5d49	141	#ifdef EDEBUG
6e37afca	142	etraci("exp2a p2", p2, vp);
843d5d49	143	#endif
6e37afca KB	144	return (p1 ^ p2);
	145	}
	146	return (p1);
843d5d49 BJ	147	}
843d5d49 BJ	148
6e37afca	149	static int
843d5d49	150	exp2b(vp, ignore)
6e37afca KB	151	register Char ***vp;
6e37afca KB	152	bool ignore;
843d5d49	153	{
6e37afca	154	register int p1 = exp2c(vp, ignore);
843d5d49 BJ	155
843d5d49 BJ	156	#ifdef EDEBUG
6e37afca	157	etraci("exp2b p1", p1, vp);
843d5d49	158	#endif
6e37afca KB	159	if (vp && eq(vp, STRand)) {
6e37afca KB	160	register int p2;
843d5d49	161
6e37afca KB	162	(*vp)++;
6e37afca KB	163	p2 = exp2b(vp, ignore);
843d5d49	164	#ifdef EDEBUG
6e37afca	165	etraci("exp2b p2", p2, vp);
843d5d49	166	#endif
6e37afca KB	167	return (p1 & p2);
	168	}
	169	return (p1);
843d5d49 BJ	170	}
843d5d49 BJ	171
6e37afca	172	static int
843d5d49	173	exp2c(vp, ignore)
6e37afca KB	174	register Char ***vp;
6e37afca KB	175	bool ignore;
843d5d49	176	{
6e37afca KB	177	register Char *p1 = exp3(vp, ignore);
	178	register Char *p2;
	179	register int i;
843d5d49 BJ	180
843d5d49 BJ	181	#ifdef EDEBUG
6e37afca	182	etracc("exp2c p1", p1, vp);
843d5d49	183	#endif
6e37afca KB	184	if (i = isa(**vp, EQOP)) {
	185	(*vp)++;
	186	if (i == EQMATCH \|\| i == NOTEQMATCH)
	187	ignore \|= NOGLOB;
	188	p2 = exp3(vp, ignore);
843d5d49	189	#ifdef EDEBUG
6e37afca	190	etracc("exp2c p2", p2, vp);
843d5d49	191	#endif
6e37afca KB	192	if (!(ignore & IGNORE))
	193	switch (i) {
	194
	195	case EQEQ:
	196	i = eq(p1, p2);
	197	break;
	198
	199	case NOTEQ:
	200	i = !eq(p1, p2);
	201	break;
	202
	203	case EQMATCH:
	204	i = Gmatch(p1, p2);
	205	break;
	206
	207	case NOTEQMATCH:
	208	i = !Gmatch(p1, p2);
	209	break;
	210	}
	211	xfree((ptr_t) p1);
	212	xfree((ptr_t) p2);
843d5d49	213	return (i);
6e37afca KB	214	}
	215	i = egetn(p1);
	216	xfree((ptr_t) p1);
	217	return (i);
843d5d49 BJ	218	}
843d5d49 BJ	219
6e37afca	220	static Char *
843d5d49	221	exp3(vp, ignore)
6e37afca KB	222	register Char ***vp;
6e37afca KB	223	bool ignore;
843d5d49	224	{
6e37afca KB	225	register Char p1, p2;
6e37afca KB	226	register int i;
843d5d49	227
6e37afca	228	p1 = exp3a(vp, ignore);
843d5d49	229	#ifdef EDEBUG
6e37afca	230	etracc("exp3 p1", p1, vp);
843d5d49	231	#endif
6e37afca KB	232	if (i = isa(**vp, RELOP)) {
	233	(*vp)++;
	234	if (vp && eq(vp, STRequal))
	235	i \|= 1, (*vp)++;
	236	p2 = exp3(vp, ignore);
843d5d49	237	#ifdef EDEBUG
6e37afca	238	etracc("exp3 p2", p2, vp);
843d5d49	239	#endif
6e37afca KB	240	if (!(ignore & IGNORE))
	241	switch (i) {
	242
	243	case GTR:
	244	i = egetn(p1) > egetn(p2);
	245	break;
	246
	247	case GTR \| 1:
	248	i = egetn(p1) >= egetn(p2);
	249	break;
	250
	251	case LSS:
	252	i = egetn(p1) < egetn(p2);
	253	break;
	254
	255	case LSS \| 1:
	256	i = egetn(p1) <= egetn(p2);
	257	break;
	258	}
	259	xfree((ptr_t) p1);
	260	xfree((ptr_t) p2);
	261	return (putn(i));
	262	}
	263	return (p1);
843d5d49 BJ	264	}
843d5d49 BJ	265
6e37afca	266	static Char *
843d5d49	267	exp3a(vp, ignore)
6e37afca KB	268	register Char ***vp;
6e37afca KB	269	bool ignore;
843d5d49	270	{
6e37afca KB	271	register Char p1, p2, *op;
6e37afca KB	272	register int i;
843d5d49	273
6e37afca	274	p1 = exp4(vp, ignore);
843d5d49	275	#ifdef EDEBUG
6e37afca	276	etracc("exp3a p1", p1, vp);
843d5d49	277	#endif
6e37afca KB	278	op = **vp;
	279	if (op && any("<>", op[0]) && op[0] == op[1]) {
	280	(*vp)++;
	281	p2 = exp3a(vp, ignore);
843d5d49	282	#ifdef EDEBUG
6e37afca KB	283	etracc("exp3a p2", p2, vp);
	284	#endif
	285	if (op[0] == '<')
	286	i = egetn(p1) << egetn(p2);
	287	else
	288	i = egetn(p1) >> egetn(p2);
	289	xfree((ptr_t) p1);
	290	xfree((ptr_t) p2);
	291	return (putn(i));
	292	}
	293	return (p1);
843d5d49 BJ	294	}
843d5d49 BJ	295
6e37afca	296	static Char *
843d5d49	297	exp4(vp, ignore)
6e37afca KB	298	register Char ***vp;
6e37afca KB	299	bool ignore;
843d5d49	300	{
6e37afca KB	301	register Char p1, p2;
6e37afca KB	302	register int i = 0;
843d5d49	303
6e37afca	304	p1 = exp5(vp, ignore);
843d5d49	305	#ifdef EDEBUG
6e37afca	306	etracc("exp4 p1", p1, vp);
843d5d49	307	#endif
6e37afca KB	308	if (isa(**vp, ADDOP)) {
6e37afca KB	309	register Char op = (*vp)++;
843d5d49	310
6e37afca	311	p2 = exp4(vp, ignore);
843d5d49	312	#ifdef EDEBUG
6e37afca	313	etracc("exp4 p2", p2, vp);
843d5d49	314	#endif
6e37afca KB	315	if (!(ignore & IGNORE))
	316	switch (op[0]) {
	317
	318	case '+':
	319	i = egetn(p1) + egetn(p2);
	320	break;
	321
	322	case '-':
	323	i = egetn(p1) - egetn(p2);
	324	break;
	325	}
	326	xfree((ptr_t) p1);
	327	xfree((ptr_t) p2);
	328	return (putn(i));
	329	}
	330	return (p1);
843d5d49 BJ	331	}
843d5d49 BJ	332
6e37afca	333	static Char *
843d5d49	334	exp5(vp, ignore)
6e37afca KB	335	register Char ***vp;
6e37afca KB	336	bool ignore;
843d5d49	337	{
6e37afca KB	338	register Char p1, p2;
6e37afca KB	339	register int i = 0;
843d5d49	340
6e37afca	341	p1 = exp6(vp, ignore);
843d5d49	342	#ifdef EDEBUG
6e37afca	343	etracc("exp5 p1", p1, vp);
843d5d49	344	#endif
6e37afca KB	345	if (isa(**vp, MULOP)) {
6e37afca KB	346	register Char op = (*vp)++;
843d5d49	347
6e37afca	348	p2 = exp5(vp, ignore);
843d5d49	349	#ifdef EDEBUG
6e37afca KB	350	etracc("exp5 p2", p2, vp);
	351	#endif
	352	if (!(ignore & IGNORE))
	353	switch (op[0]) {
	354
	355	case '*':
	356	i = egetn(p1) * egetn(p2);
	357	break;
	358
	359	case '/':
	360	i = egetn(p2);
	361	if (i == 0)
	362	stderror(ERR_DIV0);
	363	i = egetn(p1) / i;
	364	break;
	365
	366	case '%':
	367	i = egetn(p2);
	368	if (i == 0)
	369	stderror(ERR_MOD0);
	370	i = egetn(p1) % i;
	371	break;
	372	}
	373	xfree((ptr_t) p1);
	374	xfree((ptr_t) p2);
	375	return (putn(i));
	376	}
	377	return (p1);
843d5d49 BJ	378	}
843d5d49 BJ	379
6e37afca	380	static Char *
843d5d49	381	exp6(vp, ignore)
6e37afca KB	382	register Char ***vp;
6e37afca KB	383	bool ignore;
843d5d49	384	{
6e37afca KB	385	int ccode, i = 0;
	386	register Char cp, dp, *ep;
	387
	388	if (**vp == 0)
	389	stderror(ERR_NAME \| ERR_EXPRESSION);
	390	if (eq(**vp, STRbang)) {
	391	(*vp)++;
	392	cp = exp6(vp, ignore);
843d5d49	393	#ifdef EDEBUG
6e37afca	394	etracc("exp6 ! cp", cp, vp);
843d5d49	395	#endif
6e37afca KB	396	i = egetn(cp);
	397	xfree((ptr_t) cp);
	398	return (putn(!i));
	399	}
	400	if (eq(**vp, STRtilde)) {
	401	(*vp)++;
	402	cp = exp6(vp, ignore);
843d5d49	403	#ifdef EDEBUG
6e37afca	404	etracc("exp6 ~ cp", cp, vp);
843d5d49	405	#endif
6e37afca KB	406	i = egetn(cp);
	407	xfree((ptr_t) cp);
	408	return (putn(~i));
	409	}
	410	if (eq(**vp, STRLparen)) {
	411	(*vp)++;
	412	ccode = exp0(vp, ignore);
843d5d49	413	#ifdef EDEBUG
6e37afca	414	etraci("exp6 () ccode", ccode, vp);
843d5d49	415	#endif
6e37afca KB	416	if (vp == 0 \|\| vp == 0 \|\| **vp != ')')
	417	stderror(ERR_NAME \| ERR_EXPRESSION);
	418	(*vp)++;
	419	return (putn(ccode));
	420	}
	421	if (eq(**vp, STRLbrace)) {
	422	register Char **v;
	423	struct command faket;
	424	Char *fakecom[2];
	425
	426	faket.t_dtyp = NODE_COMMAND;
	427	faket.t_dflg = 0;
	428	faket.t_dcar = faket.t_dcdr = faket.t_dspr =
	429	(struct command *) 0;
	430	faket.t_dcom = fakecom;
	431	fakecom[0] = STRfakecom;
	432	fakecom[1] = NULL;
	433	(*vp)++;
	434	v = *vp;
	435	for (;;) {
	436	if (!**vp)
	437	stderror(ERR_NAME \| ERR_MISSING, '}');
	438	if (eq((vp)++, STRRbrace))
	439	break;
	440	}
	441	if (ignore & IGNORE)
	442	return (Strsave(STRNULL));
	443	psavejob();
	444	if (pfork(&faket, -1) == 0) {
	445	--(vp) = 0;
	446	evalav(v);
	447	exitstat();
843d5d49	448	}
6e37afca KB	449	pwait();
6e37afca KB	450	prestjob();
843d5d49	451	#ifdef EDEBUG
6e37afca KB	452	etraci("exp6 {} status", egetn(value(STRstatus)), vp);
	453	#endif
	454	return (putn(egetn(value(STRstatus)) == 0));
	455	}
	456	if (isa(**vp, ANYOP))
	457	return (Strsave(STRNULL));
	458	cp = (vp)++;
	459	if (*cp == '-' && any("erwxfdzopls", cp[1])) {
	460	struct stat stb;
	461
	462	if (cp[2] != '\0')
	463	stderror(ERR_NAME \| ERR_FILEINQ);
	464	/*
	465	* Detect missing file names by checking for operator in the file name
	466	* position. However, if an operator name appears there, we must make
	467	* sure that there's no file by that name (e.g., "/") before announcing
	468	* an error. Even this check isn't quite right, since it doesn't take
	469	* globbing into account.
	470	*/
	471	if (isa(vp, ANYOP) && stat(short2str(vp), &stb))
	472	stderror(ERR_NAME \| ERR_FILENAME);
	473
	474	dp = (vp)++;
	475	if (ignore & IGNORE)
	476	return (Strsave(STRNULL));
	477	ep = globone(dp, G_ERROR);
	478	switch (cp[1]) {
	479
	480	case 'r':
	481	i = !access(short2str(ep), R_OK);
	482	break;
	483
	484	case 'w':
	485	i = !access(short2str(ep), W_OK);
	486	break;
	487
	488	case 'x':
	489	i = !access(short2str(ep), X_OK);
	490	break;
	491
	492	default:
	493	if (
	494	#ifdef S_IFLNK
	495	cp[1] == 'l' ? lstat(short2str(ep), &stb) :
	496	#endif
	497	stat(short2str(ep), &stb)) {
	498	xfree((ptr_t) ep);
	499	return (Strsave(STR0));
	500	}
	501	switch (cp[1]) {
	502
	503	case 'f':
	504	i = S_ISREG(stb.st_mode);
	505	break;
	506
	507	case 'd':
	508	i = S_ISDIR(stb.st_mode);
	509	break;
	510
	511	case 'p':
	512	#ifdef S_ISFIFO
	513	i = S_ISFIFO(stb.st_mode);
	514	#else
	515	i = 0;
516	#endif
517	break;
518
519	case 'l':
520	#ifdef S_ISLNK
521	i = S_ISLNK(stb.st_mode);
522	#else
523	i = 0;
843d5d49	524	#endif
6e37afca KB	525	break;
	526
	527	case 's':
	528	#ifdef S_ISSOCK
	529	i = S_ISSOCK(stb.st_mode);
	530	#else
	531	i = 0;
	532	#endif
	533	break;
	534
	535	case 'z':
	536	i = stb.st_size == 0;
	537	break;
	538
	539	case 'e':
	540	i = 1;
	541	break;
	542
	543	case 'o':
	544	i = stb.st_uid == uid;
	545	break;
	546	}
843d5d49	547	}
843d5d49	548	#ifdef EDEBUG
6e37afca	549	etraci("exp6 -? i", i, vp);
843d5d49	550	#endif
6e37afca KB	551	xfree((ptr_t) ep);
	552	return (putn(i));
	553	}
843d5d49	554	#ifdef EDEBUG
6e37afca	555	etracc("exp6 default", cp, vp);
843d5d49	556	#endif
6e37afca	557	return (ignore & NOGLOB ? Strsave(cp) : globone(cp, G_ERROR));
843d5d49 BJ	558	}
843d5d49 BJ	559
6e37afca	560	static void
843d5d49	561	evalav(v)
6e37afca	562	register Char **v;
843d5d49	563	{
6e37afca KB	564	struct wordent paraml1;
	565	register struct wordent *hp = &paraml1;
	566	struct command *t;
	567	register struct wordent *wdp = hp;
	568
	569	set(STRstatus, Strsave(STR0));
	570	hp->prev = hp->next = hp;
	571	hp->word = STRNULL;
	572	while (*v) {
	573	register struct wordent *new =
	574	(struct wordent ) xcalloc(1, sizeof wdp);
	575
	576	new->prev = wdp;
	577	new->next = hp;
	578	wdp->next = new;
	579	wdp = new;
	580	wdp->word = Strsave(*v++);
	581	}
	582	hp->prev = wdp;
	583	alias(&paraml1);
	584	t = syntax(paraml1.next, &paraml1, 0);
	585	if (seterr)
	586	stderror(ERR_OLD);
	587	execute(t, -1);
	588	freelex(&paraml1), freesyn(t);
843d5d49 BJ	589	}
843d5d49 BJ	590
6e37afca	591	static int
843d5d49	592	isa(cp, what)
6e37afca KB	593	register Char *cp;
6e37afca KB	594	register int what;
843d5d49	595	{
6e37afca KB	596	if (cp == 0)
	597	return ((what & RESTOP) != 0);
	598	if (cp[1] == 0) {
	599	if (what & ADDOP && (cp == '+' \|\| cp == '-'))
	600	return (1);
	601	if (what & MULOP && (cp == '' \|\| cp == '/' \|\| cp == '%'))
	602	return (1);
	603	if (what & RESTOP && (cp == '(' \|\| cp == ')' \|\| *cp == '!' \|\|
	604	cp == '~' \|\| cp == '^' \|\| *cp == '"'))
	605	return (1);
	606	}
	607	else if (cp[2] == 0) {
	608	if (what & RESTOP) {
	609	if (cp[0] == '\|' && cp[1] == '&')
	610	return (1);
	611	if (cp[0] == '<' && cp[1] == '<')
	612	return (1);
	613	if (cp[0] == '>' && cp[1] == '>')
	614	return (1);
843d5d49	615	}
6e37afca KB	616	if (what & EQOP) {
	617	if (cp[0] == '=') {
	618	if (cp[1] == '=')
	619	return (EQEQ);
	620	if (cp[1] == '~')
	621	return (EQMATCH);
	622	}
	623	else if (cp[0] == '!') {
	624	if (cp[1] == '=')
	625	return (NOTEQ);
	626	if (cp[1] == '~')
	627	return (NOTEQMATCH);
	628	}
843d5d49	629	}
6e37afca KB	630	}
	631	if (what & RELOP) {
	632	if (*cp == '<')
	633	return (LSS);
	634	if (*cp == '>')
	635	return (GTR);
	636	}
	637	return (0);
843d5d49 BJ	638	}
843d5d49 BJ	639
6e37afca	640	static int
843d5d49	641	egetn(cp)
6e37afca	642	register Char *cp;
843d5d49	643	{
6e37afca KB	644	if (cp && cp != '-' && !Isdigit(*cp))
	645	stderror(ERR_NAME \| ERR_EXPRESSION);
	646	return (getn(cp));
843d5d49 BJ	647	}
	648
	649	/* Phew! */
	650
	651	#ifdef EDEBUG
6e37afca	652	static void
843d5d49	653	etraci(str, i, vp)
6e37afca KB	654	char *str;
	655	int i;
	656	Char ***vp;
843d5d49	657	{
6e37afca KB	658	xprintf("%s=%d\t", str, i);
	659	blkpr(*vp);
	660	xprintf("\n");
843d5d49	661	}
6e37afca	662	static void
843d5d49	663	etracc(str, cp, vp)
6e37afca KB	664	char *str;
	665	Char *cp;
	666	Char ***vp;
843d5d49	667	{
6e37afca KB	668	xprintf("%s=%s\t", str, cp);
	669	blkpr(*vp);
	670	xprintf("\n");
843d5d49 BJ	671	}
843d5d49 BJ	672	#endif