[unix-history] / usr / src / lib / libc / gen / setmode.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Dave Borman at Cray Research, Inc.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)setmode.c	5.11 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#include <errno.h>
#include <stddef.h>
#ifdef SETMODE_DEBUG
#include <stdio.h>
#endif
#include <stdlib.h>
#include <ctype.h>

#define	SET_LEN	6		/* initial # of bitcmd struct to malloc */
#define	SET_LEN_INCR 4		/* # of bitcmd structs to add as needed */

typedef struct bitcmd {
	char	cmd;
	char	cmd2;
	mode_t	bits;
} BITCMD;

#define	CMD2_CLR	0x01
#define	CMD2_SET	0x02
#define	CMD2_GBITS	0x04
#define	CMD2_OBITS	0x08
#define	CMD2_UBITS	0x10

static BITCMD	*addcmd __P((BITCMD *, int, int, int, u_int));
static int	 compress_mode __P((BITCMD *));
#ifdef SETMODE_DEBUG
static void	 dumpmode __P((BITCMD *));
#endif

/*
 * Given the old mode and an array of bitcmd structures, apply the operations
 * described in the bitcmd structures to the old mode, and return the new mode.
 * Note that there is no '=' command; a strict assignment is just a '-' (clear
 * bits) followed by a '+' (set bits).
 */
mode_t
getmode(bbox, omode)
	void *bbox;
	mode_t omode;
{
	register BITCMD *set;
	register mode_t newmode, value;

	set = (BITCMD *)bbox;
	newmode = omode;
	for (value = 0;; set++)
		switch(set->cmd) {
		/*
		 * When copying the user, group or other bits around, we "know"
		 * where the bits are in the mode so that we can do shifts to
		 * copy them around.  If we don't use shifts, it gets real
		 * grundgy with lots of single bit checks and bit sets.
		 */
		case 'u':
			value = (newmode & S_IRWXU) >> 6;
			goto common;

		case 'g':
			value = (newmode & S_IRWXG) >> 3;
			goto common;

		case 'o':
			value = newmode & S_IRWXO;
common:			if (set->cmd2 & CMD2_CLR) {
				if (set->cmd2 & CMD2_UBITS)
					newmode &= ~(S_IRWXU & set->bits);
				if (set->cmd2 & CMD2_GBITS)
					newmode &= ~(S_IRWXG & set->bits);
				if (set->cmd2 & CMD2_OBITS)
					newmode &= ~(S_IRWXO & set->bits);
			}
			if (set->cmd2 & CMD2_SET) {
				if (set->cmd2 & CMD2_UBITS)
					newmode |= (value<<6) & set->bits;
				if (set->cmd2 & CMD2_GBITS)
					newmode |= (value<<3) & set->bits;
				if (set->cmd2 & CMD2_OBITS)
					newmode |= value & set->bits;
			}
			break;

		case '+':
			newmode |= set->bits;
			break;

		case '-':
			newmode &= ~set->bits;
			break;

		case 'X':
			if (omode & (S_IFDIR|S_IXUSR|S_IXGRP|S_IXOTH))
				newmode |= set->bits;
			break;

		case '\0':
		default:
#ifdef SETMODE_DEBUG
			(void)printf("getmode:%04o -> %04o\n", omode, newmode);
#endif
			return (newmode);
		}
}

#define	ADDCMD(a, b, c, d) \
	if (set >= endset) { \
		register BITCMD *newset; \
		setlen += SET_LEN_INCR; \
		newset = realloc(saveset, sizeof(BITCMD) * setlen); \
		if (!saveset) \
			return (NULL); \
		set = newset + (set - saveset); \
		saveset = newset; \
		endset = newset + (setlen - 2); \
	} \
	set = addcmd(set, (a), (b), (c), (d))

#define	STANDARD_BITS	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)

void *
setmode(p)
	register char *p;
{
	register int perm, who;
	register char op;
	BITCMD *set, *saveset, *endset;
	sigset_t sigset, sigoset;
	mode_t mask;
	int permXbits, setlen;

	if (!*p)
		return (NULL);

	/*
	 * Get a copy of the mask for the permissions that are mask relative.
	 * Flip the bits, we want what's not set.  Since it's possible that
	 * the caller is opening files inside a signal handler, protect them
	 * as best we can.
	 */
	sigfillset(&sigset);
        (void)sigprocmask(SIG_BLOCK, &sigset, &sigoset);
	(void)umask(mask = umask(0));
	mask = ~mask;
        (void)sigprocmask(SIG_SETMASK, &sigoset, NULL);

	setlen = SET_LEN + 2;
	
	if ((set = malloc((u_int)(sizeof(BITCMD) * setlen))) == NULL)
		return (NULL);
	saveset = set;
	endset = set + (setlen - 2);

	/*
	 * If an absolute number, get it and return; disallow non-octal digits
	 * or illegal bits.
	 */
	if (isdigit(*p)) {
		perm = (mode_t)strtol(p, (char **)0, 8);
		if (perm & ~(STANDARD_BITS|S_ISTXT)) {
			free(saveset);
			return (NULL);
		}
		while (*++p)
			if (*p < '0' || *p > '7') {
				free(saveset);
				return (NULL);
			}
		ADDCMD('=', (STANDARD_BITS|S_ISTXT), perm, mask);
		return (saveset);
	}

	/*
	 * Build list of structures to set/clear/copy bits as described by
	 * each clause of the symbolic mode.
	 */
	for (;;) {
		/* First, find out which bits might be modified. */
		for (who = 0;; ++p) {
			switch (*p) {
			case 'a':
				who |= STANDARD_BITS;
				break;
			case 'u':
				who |= S_ISUID|S_IRWXU;
				break;
			case 'g':
				who |= S_ISGID|S_IRWXG;
				break;
			case 'o':
				who |= S_IRWXO;
				break;
			default:
				goto getop;
			}
		}

getop:		if ((op = *p++) != '+' && op != '-' && op != '=') {
			free(saveset);
			return (NULL);
		}

		who &= ~S_ISTXT;
		for (perm = 0, permXbits = 0;; ++p) {
			switch (*p) {
			case 'r':
				perm |= S_IRUSR|S_IRGRP|S_IROTH;
				break;
			case 's':
				/* If only "other" bits ignore set-id. */
				if (who & ~S_IRWXO)
					perm |= S_ISUID|S_ISGID;
				break;
			case 't':
				/* If only "other" bits ignore sticky. */
				if (who & ~S_IRWXO) {
					who |= S_ISTXT;
					perm |= S_ISTXT;
				}
				break;
			case 'w':
				perm |= S_IWUSR|S_IWGRP|S_IWOTH;
				break;
			case 'X':
				permXbits = S_IXUSR|S_IXGRP|S_IXOTH;
				break;
			case 'x':
				perm |= S_IXUSR|S_IXGRP|S_IXOTH;
				break;
			case 'u':
			case 'g':
			case 'o':
				/*
				 * When ever we hit 'u', 'g', or 'o', we have
				 * to flush out any partial mode that we have,
				 * and then do the copying of the mode bits.
				 */
				if (perm || op == '=') {
					ADDCMD(op, who, perm, mask);
					perm = 0;
				}
				if (op == '+' && permXbits) {
					ADDCMD('X', who, permXbits, mask);
					permXbits = 0;
				}
				ADDCMD(*p, who, op, mask);
				break;

			default:
				/*
				 * Add any permissions that we haven't already
				 * done.
				 */
				if (perm || op == '=') {
					ADDCMD(op, who, perm, mask);
					perm = 0;
				}
				if (permXbits) {
					ADDCMD('X', who, permXbits, mask);
					permXbits = 0;
				}
				goto apply;
			}
		}

apply:		if (!*p)
			break;
		if (*p != ',')
			goto getop;
		++p;
	}
	set->cmd = 0;
#ifdef SETMODE_DEBUG
	(void)printf("Before compress_mode()\n");
	dumpmode(saveset);
#endif
	compress_mode(saveset);
#ifdef SETMODE_DEBUG
	(void)printf("After compress_mode()\n");
	dumpmode(saveset);
#endif
	return (saveset);
}

static BITCMD *
addcmd(set, op, who, oparg, mask)
	BITCMD *set;
	register int oparg, who;
	register int op;
	u_int mask;
{
	switch (op) {
	case '+':
	case 'X':
		set->cmd = op;
		set->bits = (who ? who : mask) & oparg;
		break;

	case '-':
		set->cmd = '-';
		set->bits = (who ? who : (S_IRWXU|S_IRWXG|S_IRWXO)) & oparg;
		break;

	case '=':
		set->cmd = '-';
		if (!who) {
			set->bits = STANDARD_BITS;
			who = mask;
		} else
			set->bits = who;
		set++;

		set->cmd = '+';
		set->bits = who & oparg;
		break;
	case 'u':
	case 'g':
	case 'o':
		set->cmd = op;
		if (who) {
			set->cmd2 = ((who & S_IRUSR) ? CMD2_UBITS : 0) |
				    ((who & S_IRGRP) ? CMD2_GBITS : 0) |
				    ((who & S_IROTH) ? CMD2_OBITS : 0);
			set->bits = ~0;
		} else {
			set->cmd2 = CMD2_UBITS | CMD2_GBITS | CMD2_OBITS;
			set->bits = mask;
		}
	
		if (oparg == '+')
			set->cmd2 |= CMD2_SET;
		else if (oparg == '-')
			set->cmd2 |= CMD2_CLR;
		else if (oparg == '=')
			set->cmd2 |= CMD2_SET|CMD2_CLR;
		break;
	}
	return (set + 1);
}

#ifdef SETMODE_DEBUG
static void
dumpmode(set)
	register BITCMD *set;
{
	for (; set->cmd; ++set)
		(void)printf("cmd: '%c' bits %04o%s%s%s%s%s%s\n",
		    set->cmd, set->bits, set->cmd2 ? " cmd2:" : "",
		    set->cmd2 & CMD2_CLR ? " CLR" : "",
		    set->cmd2 & CMD2_SET ? " SET" : "",
		    set->cmd2 & CMD2_UBITS ? " UBITS" : "",
		    set->cmd2 & CMD2_GBITS ? " GBITS" : "",
		    set->cmd2 & CMD2_OBITS ? " OBITS" : "");
}
#endif

/*
 * Given an array of bitcmd structures, compress by compacting consecutive
 * '+', '-' and 'X' commands into at most 3 commands, one of each.  The 'u',
 * 'g' and 'o' commands continue to be separate.  They could probably be 
 * compacted, but it's not worth the effort.
 */
static int
compress_mode(set)
	register BITCMD *set;
{
	register BITCMD *nset;
	register int setbits, clrbits, Xbits, op;

	for (nset = set;;) {
		/* Copy over any 'u', 'g' and 'o' commands. */
		while ((op = nset->cmd) != '+' && op != '-' && op != 'X') {
			*set++ = *nset++;
			if (!op)
				return;
		}

		for (setbits = clrbits = Xbits = 0;; nset++) {
			if ((op = nset->cmd) == '-') {
				clrbits |= nset->bits;
				setbits &= ~nset->bits;
				Xbits &= ~nset->bits;
			} else if (op == '+') {
				setbits |= nset->bits;
				clrbits &= ~nset->bits;
				Xbits &= ~nset->bits;
			} else if (op == 'X')
				Xbits |= nset->bits & ~setbits;
			else
				break;
		}
		if (clrbits) {
			set->cmd = '-';
			set->cmd2 = 0;
			set->bits = clrbits;
			set++;
		}
		if (setbits) {
			set->cmd = '+';
			set->cmd2 = 0;
			set->bits = setbits;
			set++;
		}
		if (Xbits) {
			set->cmd = 'X';
			set->cmd2 = 0;
			set->bits = Xbits;
			set++;
		}
	}
}
Commit	Line	Data
0dfc069b KB	1	/*
	2	* Copyright (c) 1989 The Regents of the University of California.
	3	* All rights reserved.
	4	*
e82877a5 KB	5	* This code is derived from software contributed to Berkeley by
	6	* Dave Borman at Cray Research, Inc.
	7	*
269a7923	8	* %sccs.include.redist.c%
0dfc069b KB	9	*/
	10
	11	#if defined(LIBC_SCCS) && !defined(lint)
1ca55b48	12	static char sccsid[] = "@(#)setmode.c 5.11 (Berkeley) %G%";
0dfc069b KB	13	#endif /* LIBC_SCCS and not lint */
0dfc069b KB	14
d4a274f1	15	#include <sys/types.h>
0dfc069b	16	#include <sys/stat.h>
1ca55b48	17	#include <signal.h>
d4a274f1	18	#include <errno.h>
c05a16d0	19	#include <stddef.h>
5d85d279	20	#ifdef SETMODE_DEBUG
840c650e	21	#include <stdio.h>
5d85d279 KB	22	#endif
5d85d279 KB	23	#include <stdlib.h>
252513eb	24	#include <ctype.h>
0dfc069b	25
5d85d279 KB	26	#define SET_LEN 6 /* initial # of bitcmd struct to malloc */
5d85d279 KB	27	#define SET_LEN_INCR 4 /* # of bitcmd structs to add as needed */
0dfc069b	28
d4a274f1	29	typedef struct bitcmd {
5d85d279 KB	30	char cmd;
	31	char cmd2;
	32	mode_t bits;
d4a274f1	33	} BITCMD;
5d85d279 KB	34
	35	#define CMD2_CLR 0x01
	36	#define CMD2_SET 0x02
	37	#define CMD2_GBITS 0x04
	38	#define CMD2_OBITS 0x08
	39	#define CMD2_UBITS 0x10
	40
d4a274f1 KB	41	static BITCMD addcmd __P((BITCMD , int, int, int, u_int));
	42	static int compress_mode __P((BITCMD *));
	43	#ifdef SETMODE_DEBUG
	44	static void dumpmode __P((BITCMD *));
	45	#endif
	46
5d85d279 KB	47	/*
	48	* Given the old mode and an array of bitcmd structures, apply the operations
	49	* described in the bitcmd structures to the old mode, and return the new mode.
	50	* Note that there is no '=' command; a strict assignment is just a '-' (clear
	51	* bits) followed by a '+' (set bits).
	52	*/
0dfc069b	53	mode_t
dde0c2b4 KB	54	getmode(bbox, omode)
dde0c2b4 KB	55	void *bbox;
5d85d279	56	mode_t omode;
0dfc069b	57	{
d4a274f1	58	register BITCMD *set;
5d85d279 KB	59	register mode_t newmode, value;
5d85d279 KB	60
d4a274f1	61	set = (BITCMD *)bbox;
5d85d279 KB	62	newmode = omode;
	63	for (value = 0;; set++)
	64	switch(set->cmd) {
	65	/*
	66	* When copying the user, group or other bits around, we "know"
d4a274f1	67	* where the bits are in the mode so that we can do shifts to
5d85d279 KB	68	* copy them around. If we don't use shifts, it gets real
	69	* grundgy with lots of single bit checks and bit sets.
	70	*/
	71	case 'u':
	72	value = (newmode & S_IRWXU) >> 6;
	73	goto common;
	74
	75	case 'g':
	76	value = (newmode & S_IRWXG) >> 3;
	77	goto common;
	78
	79	case 'o':
	80	value = newmode & S_IRWXO;
d4a274f1	81	common: if (set->cmd2 & CMD2_CLR) {
5d85d279 KB	82	if (set->cmd2 & CMD2_UBITS)
	83	newmode &= ~(S_IRWXU & set->bits);
	84	if (set->cmd2 & CMD2_GBITS)
	85	newmode &= ~(S_IRWXG & set->bits);
	86	if (set->cmd2 & CMD2_OBITS)
	87	newmode &= ~(S_IRWXO & set->bits);
	88	}
	89	if (set->cmd2 & CMD2_SET) {
	90	if (set->cmd2 & CMD2_UBITS)
	91	newmode \|= (value<<6) & set->bits;
	92	if (set->cmd2 & CMD2_GBITS)
	93	newmode \|= (value<<3) & set->bits;
	94	if (set->cmd2 & CMD2_OBITS)
	95	newmode \|= value & set->bits;
	96	}
	97	break;
	98
	99	case '+':
	100	newmode \|= set->bits;
	101	break;
	102
	103	case '-':
	104	newmode &= ~set->bits;
	105	break;
	106
	107	case 'X':
	108	if (omode & (S_IFDIR\|S_IXUSR\|S_IXGRP\|S_IXOTH))
	109	newmode \|= set->bits;
	110	break;
0dfc069b	111
5d85d279 KB	112	case '\0':
	113	default:
	114	#ifdef SETMODE_DEBUG
d4a274f1	115	(void)printf("getmode:%04o -> %04o\n", omode, newmode);
5d85d279	116	#endif
d4a274f1	117	return (newmode);
5d85d279	118	}
0dfc069b KB	119	}
0dfc069b KB	120
5d85d279 KB	121	#define ADDCMD(a, b, c, d) \
5d85d279 KB	122	if (set >= endset) { \
d4a274f1	123	register BITCMD *newset; \
5d85d279	124	setlen += SET_LEN_INCR; \
d4a274f1	125	newset = realloc(saveset, sizeof(BITCMD) * setlen); \
5d85d279	126	if (!saveset) \
d4a274f1	127	return (NULL); \
5d85d279 KB	128	set = newset + (set - saveset); \
	129	saveset = newset; \
	130	endset = newset + (setlen - 2); \
	131	} \
	132	set = addcmd(set, (a), (b), (c), (d))
	133
d4a274f1 KB	134	#define STANDARD_BITS (S_ISUID\|S_ISGID\|S_IRWXU\|S_IRWXG\|S_IRWXO)
d4a274f1 KB	135
dde0c2b4	136	void *
0dfc069b KB	137	setmode(p)
	138	register char *p;
	139	{
	140	register int perm, who;
	141	register char op;
d4a274f1	142	BITCMD set, saveset, *endset;
1ca55b48	143	sigset_t sigset, sigoset;
5d85d279	144	mode_t mask;
5d85d279	145	int permXbits, setlen;
d4a274f1 KB	146
	147	if (!*p)
	148	return (NULL);
0dfc069b KB	149
0dfc069b KB	150	/*
5d85d279	151	* Get a copy of the mask for the permissions that are mask relative.
1ca55b48 KB	152	* Flip the bits, we want what's not set. Since it's possible that
	153	* the caller is opening files inside a signal handler, protect them
	154	* as best we can.
0dfc069b	155	*/
1ca55b48 KB	156	sigfillset(&sigset);
1ca55b48 KB	157	(void)sigprocmask(SIG_BLOCK, &sigset, &sigoset);
0dfc069b KB	158	(void)umask(mask = umask(0));
0dfc069b KB	159	mask = ~mask;
1ca55b48	160	(void)sigprocmask(SIG_SETMASK, &sigoset, NULL);
0dfc069b	161
5d85d279 KB	162	setlen = SET_LEN + 2;
5d85d279 KB	163
d4a274f1 KB	164	if ((set = malloc((u_int)(sizeof(BITCMD) * setlen))) == NULL)
d4a274f1 KB	165	return (NULL);
5d85d279 KB	166	saveset = set;
5d85d279 KB	167	endset = set + (setlen - 2);
0dfc069b KB	168
0dfc069b KB	169	/*
5d85d279 KB	170	* If an absolute number, get it and return; disallow non-octal digits
5d85d279 KB	171	* or illegal bits.
0dfc069b KB	172	*/
0dfc069b KB	173	if (isdigit(*p)) {
5d85d279 KB	174	perm = (mode_t)strtol(p, (char **)0, 8);
	175	if (perm & ~(STANDARD_BITS\|S_ISTXT)) {
	176	free(saveset);
d4a274f1	177	return (NULL);
5d85d279	178	}
0dfc069b	179	while (*++p)
5d85d279 KB	180	if (p < '0' \|\| p > '7') {
5d85d279 KB	181	free(saveset);
d4a274f1	182	return (NULL);
5d85d279 KB	183	}
5d85d279 KB	184	ADDCMD('=', (STANDARD_BITS\|S_ISTXT), perm, mask);
d4a274f1	185	return (saveset);
0dfc069b KB	186	}
0dfc069b KB	187
0dfc069b	188	/*
5d85d279 KB	189	* Build list of structures to set/clear/copy bits as described by
5d85d279 KB	190	* each clause of the symbolic mode.
0dfc069b KB	191	*/
0dfc069b KB	192	for (;;) {
5d85d279 KB	193	/* First, find out which bits might be modified. */
5d85d279 KB	194	for (who = 0;; ++p) {
0dfc069b KB	195	switch (*p) {
	196	case 'a':
	197	who \|= STANDARD_BITS;
	198	break;
	199	case 'u':
	200	who \|= S_ISUID\|S_IRWXU;
	201	break;
	202	case 'g':
	203	who \|= S_ISGID\|S_IRWXG;
	204	break;
	205	case 'o':
	206	who \|= S_IRWXO;
	207	break;
	208	default:
	209	goto getop;
	210	}
5d85d279	211	}
0dfc069b	212
d4a274f1	213	getop: if ((op = *p++) != '+' && op != '-' && op != '=') {
5d85d279	214	free(saveset);
d4a274f1	215	return (NULL);
5d85d279	216	}
0dfc069b KB	217
0dfc069b KB	218	who &= ~S_ISTXT;
5d85d279	219	for (perm = 0, permXbits = 0;; ++p) {
0dfc069b KB	220	switch (*p) {
	221	case 'r':
	222	perm \|= S_IRUSR\|S_IRGRP\|S_IROTH;
	223	break;
	224	case 's':
5d85d279	225	/* If only "other" bits ignore set-id. */
0dfc069b KB	226	if (who & ~S_IRWXO)
	227	perm \|= S_ISUID\|S_ISGID;
	228	break;
	229	case 't':
5d85d279	230	/* If only "other" bits ignore sticky. */
0dfc069b KB	231	if (who & ~S_IRWXO) {
	232	who \|= S_ISTXT;
	233	perm \|= S_ISTXT;
	234	}
	235	break;
	236	case 'w':
	237	perm \|= S_IWUSR\|S_IWGRP\|S_IWOTH;
	238	break;
	239	case 'X':
	240	permXbits = S_IXUSR\|S_IXGRP\|S_IXOTH;
	241	break;
	242	case 'x':
	243	perm \|= S_IXUSR\|S_IXGRP\|S_IXOTH;
	244	break;
5d85d279 KB	245	case 'u':
	246	case 'g':
	247	case 'o':
	248	/*
	249	* When ever we hit 'u', 'g', or 'o', we have
	250	* to flush out any partial mode that we have,
	251	* and then do the copying of the mode bits.
	252	*/
e82877a5	253	if (perm \|\| op == '=') {
5d85d279 KB	254	ADDCMD(op, who, perm, mask);
	255	perm = 0;
	256	}
	257	if (op == '+' && permXbits) {
	258	ADDCMD('X', who, permXbits, mask);
	259	permXbits = 0;
	260	}
	261	ADDCMD(*p, who, op, mask);
	262	break;
	263
0dfc069b	264	default:
5d85d279 KB	265	/*
	266	* Add any permissions that we haven't already
	267	* done.
	268	*/
e82877a5	269	if (perm \|\| op == '=') {
5d85d279 KB	270	ADDCMD(op, who, perm, mask);
	271	perm = 0;
	272	}
	273	if (permXbits) {
	274	ADDCMD('X', who, permXbits, mask);
	275	permXbits = 0;
	276	}
0dfc069b KB	277	goto apply;
0dfc069b KB	278	}
0dfc069b KB	279	}
0dfc069b KB	280
5d85d279	281	apply: if (!*p)
0dfc069b KB	282	break;
	283	if (*p != ',')
	284	goto getop;
	285	++p;
	286	}
5d85d279 KB	287	set->cmd = 0;
	288	#ifdef SETMODE_DEBUG
	289	(void)printf("Before compress_mode()\n");
	290	dumpmode(saveset);
	291	#endif
	292	compress_mode(saveset);
	293	#ifdef SETMODE_DEBUG
	294	(void)printf("After compress_mode()\n");
	295	dumpmode(saveset);
	296	#endif
d4a274f1 KB	297	return (saveset);
	298	}
	299
	300	static BITCMD *
	301	addcmd(set, op, who, oparg, mask)
	302	BITCMD *set;
	303	register int oparg, who;
	304	register int op;
	305	u_int mask;
	306	{
	307	switch (op) {
	308	case '+':
	309	case 'X':
	310	set->cmd = op;
	311	set->bits = (who ? who : mask) & oparg;
	312	break;
	313
	314	case '-':
	315	set->cmd = '-';
	316	set->bits = (who ? who : (S_IRWXU\|S_IRWXG\|S_IRWXO)) & oparg;
	317	break;
	318
	319	case '=':
	320	set->cmd = '-';
	321	if (!who) {
	322	set->bits = STANDARD_BITS;
	323	who = mask;
	324	} else
	325	set->bits = who;
	326	set++;
	327
	328	set->cmd = '+';
	329	set->bits = who & oparg;
	330	break;
	331	case 'u':
	332	case 'g':
	333	case 'o':
	334	set->cmd = op;
	335	if (who) {
	336	set->cmd2 = ((who & S_IRUSR) ? CMD2_UBITS : 0) \|
	337	((who & S_IRGRP) ? CMD2_GBITS : 0) \|
	338	((who & S_IROTH) ? CMD2_OBITS : 0);
	339	set->bits = ~0;
	340	} else {
	341	set->cmd2 = CMD2_UBITS \| CMD2_GBITS \| CMD2_OBITS;
	342	set->bits = mask;
	343	}
	344
	345	if (oparg == '+')
	346	set->cmd2 \|= CMD2_SET;
	347	else if (oparg == '-')
	348	set->cmd2 \|= CMD2_CLR;
	349	else if (oparg == '=')
	350	set->cmd2 \|= CMD2_SET\|CMD2_CLR;
	351	break;
	352	}
	353	return (set + 1);
5d85d279 KB	354	}
	355
	356	#ifdef SETMODE_DEBUG
d4a274f1	357	static void
5d85d279	358	dumpmode(set)
d4a274f1	359	register BITCMD *set;
5d85d279 KB	360	{
	361	for (; set->cmd; ++set)
	362	(void)printf("cmd: '%c' bits %04o%s%s%s%s%s%s\n",
	363	set->cmd, set->bits, set->cmd2 ? " cmd2:" : "",
	364	set->cmd2 & CMD2_CLR ? " CLR" : "",
	365	set->cmd2 & CMD2_SET ? " SET" : "",
	366	set->cmd2 & CMD2_UBITS ? " UBITS" : "",
	367	set->cmd2 & CMD2_GBITS ? " GBITS" : "",
	368	set->cmd2 & CMD2_OBITS ? " OBITS" : "");
	369	}
	370	#endif
	371
	372	/*
	373	* Given an array of bitcmd structures, compress by compacting consecutive
	374	* '+', '-' and 'X' commands into at most 3 commands, one of each. The 'u',
	375	* 'g' and 'o' commands continue to be separate. They could probably be
	376	* compacted, but it's not worth the effort.
	377	*/
d4a274f1	378	static int
5d85d279	379	compress_mode(set)
d4a274f1	380	register BITCMD *set;
5d85d279	381	{
d4a274f1	382	register BITCMD *nset;
5d85d279 KB	383	register int setbits, clrbits, Xbits, op;
	384
	385	for (nset = set;;) {
	386	/* Copy over any 'u', 'g' and 'o' commands. */
	387	while ((op = nset->cmd) != '+' && op != '-' && op != 'X') {
	388	set++ = nset++;
	389	if (!op)
	390	return;
	391	}
	392
	393	for (setbits = clrbits = Xbits = 0;; nset++) {
	394	if ((op = nset->cmd) == '-') {
	395	clrbits \|= nset->bits;
	396	setbits &= ~nset->bits;
	397	Xbits &= ~nset->bits;
	398	} else if (op == '+') {
	399	setbits \|= nset->bits;
	400	clrbits &= ~nset->bits;
	401	Xbits &= ~nset->bits;
	402	} else if (op == 'X')
	403	Xbits \|= nset->bits & ~setbits;
	404	else
	405	break;
	406	}
	407	if (clrbits) {
	408	set->cmd = '-';
	409	set->cmd2 = 0;
	410	set->bits = clrbits;
	411	set++;
	412	}
	413	if (setbits) {
	414	set->cmd = '+';
	415	set->cmd2 = 0;
	416	set->bits = setbits;
	417	set++;
	418	}
	419	if (Xbits) {
	420	set->cmd = 'X';
	421	set->cmd2 = 0;
	422	set->bits = Xbits;
	423	set++;
	424	}
	425	}
0dfc069b	426	}