[unix-history] / usr / src / cmd / find.c

static char *sccsid = "@(#)find.c	4.1 (Berkeley) 10/1/80";
/*	find	COMPILE:	cc -o find -s -O -i find.c -lS	*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/dir.h>
#include <sys/stat.h>
#define A_DAY	86400L /* a day full of seconds */
#define EQ(x, y)	(strcmp(x, y)==0)

int	Randlast;
char	Pathname[200];

struct anode {
	int (*F)();
	struct anode *L, *R;
} Node[100];
int Nn;  /* number of nodes */
char	*Fname;
long	Now;
int	Argc,
	Ai,
	Pi;
char	**Argv;
/* cpio stuff */
int	Cpio;
short	*Buf, *Dbuf, *Wp;
int	Bufsize = 5120;
int	Wct = 2560;

long	Newer;

struct stat Statb;

struct	anode	*exp(),
		*e1(),
		*e2(),
		*e3(),
		*mk();
char	*nxtarg();
char	Home[128];
long	Blocks;
char *rindex();
char *sbrk();
main(argc, argv) char *argv[];
{
	struct anode *exlist;
	int paths;
	register char *cp, *sp = 0;
	FILE *pwd, *popen();

	time(&Now);
	pwd = popen("pwd", "r");
	fgets(Home, 128, pwd);
	pclose(pwd);
	Home[strlen(Home) - 1] = '\0';
	Argc = argc; Argv = argv;
	if(argc<3) {
usage:		fprintf(stderr, "Usage: find path-list predicate-list\n");
		exit(1);
	}
	for(Ai = paths = 1; Ai < (argc-1); ++Ai, ++paths)
		if(*Argv[Ai] == '-' || EQ(Argv[Ai], "(") || EQ(Argv[Ai], "!"))
			break;
	if(paths == 1) /* no path-list */
		goto usage;
	if(!(exlist = exp())) { /* parse and compile the arguments */
		fprintf(stderr, "find: parsing error\n");
		exit(1);
	}
	if(Ai<argc) {
		fprintf(stderr, "find: missing conjunction\n");
		exit(1);
	}
	for(Pi = 1; Pi < paths; ++Pi) {
		sp = 0;
		chdir(Home);
		strcpy(Pathname, Argv[Pi]);
		if(cp = rindex(Pathname, '/')) {
			sp = cp + 1;
			*cp = '\0';
			if(chdir(*Pathname? Pathname: "/") == -1) {
				fprintf(stderr, "find: bad starting directory\n");
				exit(2);
			}
			*cp = '/';
		}
		Fname = sp? sp: Pathname;
		descend(Pathname, Fname, exlist); /* to find files that match  */
	}
	if(Cpio) {
		strcpy(Pathname, "TRAILER!!!");
		Statb.st_size = 0;
		cpio();
		printf("%D blocks\n", Blocks*10);
	}
	exit(0);
}

/* compile time functions:  priority is  exp()<e1()<e2()<e3()  */

struct anode *exp() { /* parse ALTERNATION (-o)  */
	int or();
	register struct anode * p1;

	p1 = e1() /* get left operand */ ;
	if(EQ(nxtarg(), "-o")) {
		Randlast--;
		return(mk(or, p1, exp()));
	}
	else if(Ai <= Argc) --Ai;
	return(p1);
}
struct anode *e1() { /* parse CONCATENATION (formerly -a) */
	int and();
	register struct anode * p1;
	register char *a;

	p1 = e2();
	a = nxtarg();
	if(EQ(a, "-a")) {
And:
		Randlast--;
		return(mk(and, p1, e1()));
	} else if(EQ(a, "(") || EQ(a, "!") || (*a=='-' && !EQ(a, "-o"))) {
		--Ai;
		goto And;
	} else if(Ai <= Argc) --Ai;
	return(p1);
}
struct anode *e2() { /* parse NOT (!) */
	int not();

	if(Randlast) {
		fprintf(stderr, "find: operand follows operand\n");
		exit(1);
	}
	Randlast++;
	if(EQ(nxtarg(), "!"))
		return(mk(not, e3(), (struct anode *)0));
	else if(Ai <= Argc) --Ai;
	return(e3());
}
struct anode *e3() { /* parse parens and predicates */
	int exeq(), ok(), glob(),  mtime(), atime(), user(),
		group(), size(), perm(), links(), print(),
		type(), ino(), cpio(), newer();
	struct anode *p1;
	int i;
	register char *a, *b, s;

	a = nxtarg();
	if(EQ(a, "(")) {
		Randlast--;
		p1 = exp();
		a = nxtarg();
		if(!EQ(a, ")")) goto err;
		return(p1);
	}
	else if(EQ(a, "-print")) {
		return(mk(print, (struct anode *)0, (struct anode *)0));
	}
	b = nxtarg();
	s = *b;
	if(s=='+') b++;
	if(EQ(a, "-name"))
		return(mk(glob, (struct anode *)b, (struct anode *)0));
	else if(EQ(a, "-mtime"))
		return(mk(mtime, (struct anode *)atoi(b), (struct anode *)s));
	else if(EQ(a, "-atime"))
		return(mk(atime, (struct anode *)atoi(b), (struct anode *)s));
	else if(EQ(a, "-user")) {
		if((i=getunum("/etc/passwd", b)) == -1) {
			if(gmatch(b, "[0-9][0-9]*"))
				return mk(user, (struct anode *)atoi(b), (struct anode *)s);
			fprintf(stderr, "find: cannot find -user name\n");
			exit(1);
		}
		return(mk(user, (struct anode *)i, (struct anode *)s));
	}
	else if(EQ(a, "-inum"))
		return(mk(ino, (struct anode *)atoi(b), (struct anode *)s));
	else if(EQ(a, "-group")) {
		if((i=getunum("/etc/group", b)) == -1) {
			if(gmatch(b, "[0-9][0-9]*"))
				return mk(group, (struct anode *)atoi(b), (struct anode *)s);
			fprintf(stderr, "find: cannot find -group name\n");
			exit(1);
		}
		return(mk(group, (struct anode *)i, (struct anode *)s));
	} else if(EQ(a, "-size"))
		return(mk(size, (struct anode *)atoi(b), (struct anode *)s));
	else if(EQ(a, "-links"))
		return(mk(links, (struct anode *)atoi(b), (struct anode *)s));
	else if(EQ(a, "-perm")) {
		for(i=0; *b ; ++b) {
			if(*b=='-') continue;
			i <<= 3;
			i = i + (*b - '0');
		}
		return(mk(perm, (struct anode *)i, (struct anode *)s));
	}
	else if(EQ(a, "-type")) {
		i = s=='d' ? S_IFDIR :
		    s=='b' ? S_IFBLK :
		    s=='c' ? S_IFCHR :
		    s=='f' ? 0100000 :
		    0;
		return(mk(type, (struct anode *)i, (struct anode *)0));
	}
	else if (EQ(a, "-exec")) {
		i = Ai - 1;
		while(!EQ(nxtarg(), ";"));
		return(mk(exeq, (struct anode *)i, (struct anode *)0));
	}
	else if (EQ(a, "-ok")) {
		i = Ai - 1;
		while(!EQ(nxtarg(), ";"));
		return(mk(ok, (struct anode *)i, (struct anode *)0));
	}
	else if(EQ(a, "-cpio")) {
		if((Cpio = creat(b, 0666)) < 0) {
			fprintf(stderr, "find: cannot create < %s >\n", s);
			exit(1);
		}
		Buf = (short *)sbrk(512);
		Wp = Dbuf = (short *)sbrk(5120);
		return(mk(cpio, (struct anode *)0, (struct anode *)0));
	}
	else if(EQ(a, "-newer")) {
		if(stat(b, &Statb) < 0) {
			fprintf(stderr, "find: cannot access < %s >\n", b);
			exit(1);
		}
		Newer = Statb.st_mtime;
		return mk(newer, (struct anode *)0, (struct anode *)0);
	}
err:	fprintf(stderr, "find: bad option < %s >\n", a);
	exit(1);
}
struct anode *mk(f, l, r)
int (*f)();
struct anode *l, *r;
{
	Node[Nn].F = f;
	Node[Nn].L = l;
	Node[Nn].R = r;
	return(&(Node[Nn++]));
}

char *nxtarg() { /* get next arg from command line */
	static strikes = 0;

	if(strikes==3) {
		fprintf(stderr, "find: incomplete statement\n");
		exit(1);
	}
	if(Ai>=Argc) {
		strikes++;
		Ai = Argc + 1;
		return("");
	}
	return(Argv[Ai++]);
}

/* execution time functions */
and(p)
register struct anode *p;
{
	return(((*p->L->F)(p->L)) && ((*p->R->F)(p->R))?1:0);
}
or(p)
register struct anode *p;
{
	 return(((*p->L->F)(p->L)) || ((*p->R->F)(p->R))?1:0);
}
not(p)
register struct anode *p;
{
	return( !((*p->L->F)(p->L)));
}
glob(p)
register struct { int f; char *pat; } *p; 
{
	return(gmatch(Fname, p->pat));
}
print()
{
	puts(Pathname);
	return(1);
}
mtime(p)
register struct { int f, t, s; } *p; 
{
	return(scomp((int)((Now - Statb.st_mtime) / A_DAY), p->t, p->s));
}
atime(p)
register struct { int f, t, s; } *p; 
{
	return(scomp((int)((Now - Statb.st_atime) / A_DAY), p->t, p->s));
}
user(p)
register struct { int f, u, s; } *p; 
{
	return(scomp(Statb.st_uid, p->u, p->s));
}
ino(p)
register struct { int f, u, s; } *p;
{
	return(scomp((int)Statb.st_ino, p->u, p->s));
}
group(p)
register struct { int f, u; } *p; 
{
	return(p->u == Statb.st_gid);
}
links(p)
register struct { int f, link, s; } *p; 
{
	return(scomp(Statb.st_nlink, p->link, p->s));
}
size(p)
register struct { int f, sz, s; } *p; 
{
	return(scomp((int)((Statb.st_size+511)>>9), p->sz, p->s));
}
perm(p)
register struct { int f, per, s; } *p; 
{
	register i;
	i = (p->s=='-') ? p->per : 07777; /* '-' means only arg bits */
	return((Statb.st_mode & i & 07777) == p->per);
}
type(p)
register struct { int f, per, s; } *p;
{
	return((Statb.st_mode&S_IFMT)==p->per);
}
exeq(p)
register struct { int f, com; } *p;
{
	fflush(stdout); /* to flush possible `-print' */
	return(doex(p->com));
}
ok(p)
struct { int f, com; } *p;
{
	char c;  int yes;
	yes = 0;
	fflush(stdout); /* to flush possible `-print' */
	fprintf(stderr, "< %s ... %s > ?   ", Argv[p->com], Pathname);
	fflush(stderr);
	if((c=getchar())=='y') yes = 1;
	while(c!='\n') c = getchar();
	if(yes) return(doex(p->com));
	return(0);
}

#define MKSHORT(v, lv) {U.l=1L;if(U.c[0]) U.l=lv, v[0]=U.s[1], v[1]=U.s[0]; else U.l=lv, v[0]=U.s[0], v[1]=U.s[1];}
union { long l; short s[2]; char c[4]; } U;
long mklong(v)
short v[];
{
	U.l = 1;
	if(U.c[0] /* VAX */)
		U.s[0] = v[1], U.s[1] = v[0];
	else
		U.s[0] = v[0], U.s[1] = v[1];
	return U.l;
}
cpio()
{
#define MAGIC 070707
	struct header {
		short	h_magic,
			h_dev,
			h_ino,
			h_mode,
			h_uid,
			h_gid,
			h_nlink,
			h_rdev;
		short	h_mtime[2];
		short	h_namesize;
		short	h_filesize[2];
		char	h_name[256];
	} hdr;
	register ifile, ct;
	static long fsz;
	register i;

	hdr.h_magic = MAGIC;
	strcpy(hdr.h_name, !strncmp(Pathname, "./", 2)? Pathname+2: Pathname);
	hdr.h_namesize = strlen(hdr.h_name) + 1;
	hdr.h_uid = Statb.st_uid;
	hdr.h_gid = Statb.st_gid;
	hdr.h_dev = Statb.st_dev;
	hdr.h_ino = Statb.st_ino;
	hdr.h_mode = Statb.st_mode;
	MKSHORT(hdr.h_mtime, Statb.st_mtime);
	hdr.h_nlink = Statb.st_nlink;
	fsz = hdr.h_mode & S_IFREG? Statb.st_size: 0L;
	MKSHORT(hdr.h_filesize, fsz);
	hdr.h_rdev = Statb.st_rdev;
	if(EQ(hdr.h_name, "TRAILER!!!")) {
		bwrite((short *)&hdr, (sizeof hdr-256)+hdr.h_namesize);
		for(i = 0; i < 10; ++i)
			bwrite(Buf, 512);
		return;
	}
	if(!mklong(hdr.h_filesize))
		return;
	if((ifile = open(Fname, 0)) < 0) {
cerror:
		fprintf(stderr, "find: cannot copy < %s >\n", hdr.h_name);
		return;
	}
	bwrite((short *)&hdr, (sizeof hdr-256)+hdr.h_namesize);
	for(fsz = mklong(hdr.h_filesize); fsz > 0; fsz -= 512) {
		ct = fsz>512? 512: fsz;
		if(read(ifile, (char *)Buf, ct) < 0)
			goto cerror;
		bwrite(Buf, ct);
	}
	close(ifile);
	return;
}
newer()
{
	return Statb.st_mtime > Newer;
}

/* support functions */
scomp(a, b, s) /* funny signed compare */
register a, b;
register char s;
{
	if(s == '+')
		return(a > b);
	if(s == '-')
		return(a < (b * -1));
	return(a == b);
}

doex(com)
{
	register np;
	register char *na;
	static char *nargv[50];
	static ccode;

	ccode = np = 0;
	while (na=Argv[com++]) {
		if(strcmp(na, ";")==0) break;
		if(strcmp(na, "{}")==0) nargv[np++] = Pathname;
		else nargv[np++] = na;
	}
	nargv[np] = 0;
	if (np==0) return(9);
	if(fork()) /*parent*/ wait(&ccode);
	else { /*child*/
		chdir(Home);
		execvp(nargv[0], nargv, np);
		exit(1);
	}
	return(ccode ? 0:1);
}

getunum(f, s) char *f, *s; { /* find user/group name and return number */
	register i;
	register char *sp;
	register c;
	char str[20];
	FILE *pin;

	i = -1;
	pin = fopen(f, "r");
	c = '\n'; /* prime with a CR */
	do {
		if(c=='\n') {
			sp = str;
			while((c = *sp++ = getc(pin)) != ':')
				if(c == EOF) goto RET;
			*--sp = '\0';
			if(EQ(str, s)) {
				while((c=getc(pin)) != ':')
					if(c == EOF) goto RET;
				sp = str;
				while((*sp = getc(pin)) != ':') sp++;
				*sp = '\0';
				i = atoi(str);
				goto RET;
			}
		}
	} while((c = getc(pin)) != EOF);
 RET:
	fclose(pin);
	return(i);
}

descend(name, fname, exlist)
struct anode *exlist;
char *name, *fname;
{
	int	dir = 0, /* open directory */
		offset,
		dsize,
		entries,
		dirsize;
	struct direct dentry[BUFSIZ / sizeof (struct direct)];
	register struct direct	*dp;
	register char *c1, *c2;
	int i;
	int rv = 0;
	char *endofname;

	if(stat(fname, &Statb)<0) {
		fprintf(stderr, "find: bad status < %s >\n", name);
		return(0);
	}
	(*exlist->F)(exlist);
	if((Statb.st_mode&S_IFMT)!=S_IFDIR)
		return(1);

	for(c1 = name; *c1; ++c1);
	if(*(c1-1) == '/')
		--c1;
	endofname = c1;
	dirsize = Statb.st_size;

	if(chdir(fname) == -1)
		return(0);
	for(offset=0 ; offset < dirsize ; offset += BUFSIZ) { /* each block */
		dsize = BUFSIZ<(dirsize-offset)? BUFSIZ: (dirsize-offset);
		if(!dir) {
			if((dir=open(".", 0))<0) {
				fprintf(stderr, "find: cannot open < %s >\n",
					name);
				rv = 0;
				goto ret;
			}
			if(offset) lseek(dir, (long)offset, 0);
			if(read(dir, (char *)dentry, dsize)<0) {
				fprintf(stderr, "find: cannot read < %s >\n",
					name);
				rv = 0;
				goto ret;
			}
			if(dir > 10) {
				close(dir);
				dir = 0;
			}
		} else 
			if(read(dir, (char *)dentry, dsize)<0) {
				fprintf(stderr, "find: cannot read < %s >\n",
					name);
				rv = 0;
				goto ret;
			}
		for(dp=dentry, entries=dsize>>4; entries; --entries, ++dp) { /* each directory entry */
			if(dp->d_ino==0
			|| (dp->d_name[0]=='.' && dp->d_name[1]=='\0')
			|| (dp->d_name[0]=='.' && dp->d_name[1]=='.' && dp->d_name[2]=='\0'))
				continue;
			c1 = endofname;
			*c1++ = '/';
			c2 = dp->d_name;
			for(i=0; i<14; ++i)
				if(*c2)
					*c1++ = *c2++;
				else
					break;
			*c1 = '\0';
			if(c1 == endofname) { /* ?? */
				rv = 0;
				goto ret;
			}
			Fname = endofname+1;
			if(!descend(name, Fname, exlist)) {
				*endofname = '\0';
				chdir(Home);
				if(chdir(Pathname) == -1) {
					fprintf(stderr, "find: bad directory tree\n");
					exit(1);
				}
			}
		}
	}
	rv = 1;
ret:
	if(dir)
		close(dir);
	if(chdir("..") == -1) {
		*endofname = '\0';
		fprintf(stderr, "find: bad directory <%s>\n", name);
		rv = 1;
	}
	return(rv);
}

gmatch(s, p) /* string match as in glob */
register char *s, *p;
{
	if (*s=='.' && *p!='.') return(0);
	return amatch(s, p);
}

amatch(s, p)
register char *s, *p;
{
	register cc;
	int scc, k;
	int c, lc;

	scc = *s;
	lc = 077777;
	switch (c = *p) {

	case '[':
		k = 0;
		while (cc = *++p) {
			switch (cc) {

			case ']':
				if (k)
					return(amatch(++s, ++p));
				else
					return(0);

			case '-':
				k |= lc <= scc & scc <= (cc=p[1]);
			}
			if (scc==(lc=cc)) k++;
		}
		return(0);

	case '?':
	caseq:
		if(scc) return(amatch(++s, ++p));
		return(0);
	case '*':
		return(umatch(s, ++p));
	case 0:
		return(!scc);
	}
	if (c==scc) goto caseq;
	return(0);
}

umatch(s, p)
register char *s, *p;
{
	if(*p==0) return(1);
	while(*s)
		if (amatch(s++, p)) return(1);
	return(0);
}

bwrite(rp, c)
register short *rp;
register c;
{
	register short *wp = Wp;

	c = (c+1) >> 1;
	while(c--) {
		if(!Wct) {
again:
			if(write(Cpio, (char *)Dbuf, Bufsize)<0) {
				Cpio = chgreel(1, Cpio);
				goto again;
			}
			Wct = Bufsize >> 1;
			wp = Dbuf;
			++Blocks;
		}
		*wp++ = *rp++;
		--Wct;
	}
	Wp = wp;
}
chgreel(x, fl)
{
	register f;
	char str[22];
	FILE *devtty;
	struct stat statb;
	extern errno;

	fprintf(stderr, "find: errno: %d, ", errno);
	fprintf(stderr, "find: can't %s\n", x? "write output": "read input");
	fstat(fl, &statb);
	if((statb.st_mode&S_IFMT) != S_IFCHR)
		exit(1);
again:
	fprintf(stderr, "If you want to go on, type device/file name %s\n",
		"when ready");
	devtty = fopen("/dev/tty", "r");
	fgets(str, 20, devtty);
	str[strlen(str) - 1] = '\0';
	if(!*str)
		exit(1);
	close(fl);
	if((f = open(str, x? 1: 0)) < 0) {
		fprintf(stderr, "That didn't work");
		fclose(devtty);
		goto again;
	}
	return f;
}
Commit	Line	Data
31cef89c	1	static char *sccsid = "@(#)find.c 4.1 (Berkeley) 10/1/80";
9b2057ae BJ	2	/* find COMPILE: cc -o find -s -O -i find.c -lS */
	3	#include <stdio.h>
	4	#include <sys/types.h>
	5	#include <sys/dir.h>
	6	#include <sys/stat.h>
	7	#define A_DAY 86400L /* a day full of seconds */
	8	#define EQ(x, y) (strcmp(x, y)==0)
	9
	10	int Randlast;
	11	char Pathname[200];
	12
	13	struct anode {
	14	int (*F)();
	15	struct anode L, R;
	16	} Node[100];
	17	int Nn; /* number of nodes */
	18	char *Fname;
	19	long Now;
	20	int Argc,
	21	Ai,
	22	Pi;
	23	char **Argv;
	24	/* cpio stuff */
	25	int Cpio;
	26	short Buf, Dbuf, *Wp;
	27	int Bufsize = 5120;
	28	int Wct = 2560;
	29
	30	long Newer;
	31
	32	struct stat Statb;
	33
	34	struct anode *exp(),
	35	*e1(),
	36	*e2(),
	37	*e3(),
	38	*mk();
	39	char *nxtarg();
	40	char Home[128];
	41	long Blocks;
	42	char *rindex();
	43	char *sbrk();
	44	main(argc, argv) char *argv[];
	45	{
	46	struct anode *exlist;
	47	int paths;
	48	register char cp, sp = 0;
	49	FILE pwd, popen();
	50
	51	time(&Now);
	52	pwd = popen("pwd", "r");
	53	fgets(Home, 128, pwd);
	54	pclose(pwd);
	55	Home[strlen(Home) - 1] = '\0';
	56	Argc = argc; Argv = argv;
	57	if(argc<3) {
	58	usage: fprintf(stderr, "Usage: find path-list predicate-list\n");
	59	exit(1);
	60	}
	61	for(Ai = paths = 1; Ai < (argc-1); ++Ai, ++paths)
	62	if(*Argv[Ai] == '-' \|\| EQ(Argv[Ai], "(") \|\| EQ(Argv[Ai], "!"))
	63	break;
	64	if(paths == 1) /* no path-list */
	65	goto usage;
66	if(!(exlist = exp())) { /* parse and compile the arguments */
67	fprintf(stderr, "find: parsing error\n");
68	exit(1);
69	}
70	if(Ai<argc) {
71	fprintf(stderr, "find: missing conjunction\n");
72	exit(1);
73	}
74	for(Pi = 1; Pi < paths; ++Pi) {
75	sp = 0;
76	chdir(Home);
77	strcpy(Pathname, Argv[Pi]);
78	if(cp = rindex(Pathname, '/')) {
79	sp = cp + 1;
80	*cp = '\0';
81	if(chdir(*Pathname? Pathname: "/") == -1) {
82	fprintf(stderr, "find: bad starting directory\n");
83	exit(2);
84	}
85	*cp = '/';
86	}
87	Fname = sp? sp: Pathname;
88	descend(Pathname, Fname, exlist); /* to find files that match */
89	}
90	if(Cpio) {
91	strcpy(Pathname, "TRAILER!!!");
92	Statb.st_size = 0;
93	cpio();
94	printf("%D blocks\n", Blocks*10);
95	}
96	exit(0);
97	}
98
99	/* compile time functions: priority is exp()<e1()<e2()<e3() */
100
101	struct anode exp() { / parse ALTERNATION (-o) */
102	int or();
103	register struct anode * p1;
104
105	p1 = e1() /* get left operand */ ;
106	if(EQ(nxtarg(), "-o")) {
107	Randlast--;
108	return(mk(or, p1, exp()));
109	}
110	else if(Ai <= Argc) --Ai;
111	return(p1);
112	}
113	struct anode e1() { / parse CONCATENATION (formerly -a) */
114	int and();
115	register struct anode * p1;
116	register char *a;
117
118	p1 = e2();
119	a = nxtarg();
120	if(EQ(a, "-a")) {
121	And:
122	Randlast--;
123	return(mk(and, p1, e1()));
124	} else if(EQ(a, "(") \|\| EQ(a, "!") \|\| (*a=='-' && !EQ(a, "-o"))) {
125	--Ai;
126	goto And;
127	} else if(Ai <= Argc) --Ai;
128	return(p1);
129	}
130	struct anode e2() { / parse NOT (!) */
131	int not();
132
133	if(Randlast) {
134	fprintf(stderr, "find: operand follows operand\n");
135	exit(1);
136	}
137	Randlast++;
138	if(EQ(nxtarg(), "!"))
139	return(mk(not, e3(), (struct anode *)0));
140	else if(Ai <= Argc) --Ai;
141	return(e3());
142	}
143	struct anode e3() { / parse parens and predicates */
144	int exeq(), ok(), glob(), mtime(), atime(), user(),
145	group(), size(), perm(), links(), print(),
146	type(), ino(), cpio(), newer();
147	struct anode *p1;
148	int i;
149	register char a, b, s;
150
151	a = nxtarg();
152	if(EQ(a, "(")) {
153	Randlast--;
154	p1 = exp();
155	a = nxtarg();
156	if(!EQ(a, ")")) goto err;
157	return(p1);
158	}
159	else if(EQ(a, "-print")) {
160	return(mk(print, (struct anode )0, (struct anode )0));
161	}
162	b = nxtarg();
163	s = *b;
164	if(s=='+') b++;
165	if(EQ(a, "-name"))
166	return(mk(glob, (struct anode )b, (struct anode )0));
167	else if(EQ(a, "-mtime"))
168	return(mk(mtime, (struct anode )atoi(b), (struct anode )s));
169	else if(EQ(a, "-atime"))
170	return(mk(atime, (struct anode )atoi(b), (struct anode )s));
171	else if(EQ(a, "-user")) {
172	if((i=getunum("/etc/passwd", b)) == -1) {
173	if(gmatch(b, "[0-9][0-9]*"))
174	return mk(user, (struct anode )atoi(b), (struct anode )s);
175	fprintf(stderr, "find: cannot find -user name\n");
176	exit(1);
177	}
178	return(mk(user, (struct anode )i, (struct anode )s));
179	}
180	else if(EQ(a, "-inum"))
181	return(mk(ino, (struct anode )atoi(b), (struct anode )s));
182	else if(EQ(a, "-group")) {
183	if((i=getunum("/etc/group", b)) == -1) {
184	if(gmatch(b, "[0-9][0-9]*"))
185	return mk(group, (struct anode )atoi(b), (struct anode )s);
186	fprintf(stderr, "find: cannot find -group name\n");
187	exit(1);
188	}
189	return(mk(group, (struct anode )i, (struct anode )s));
190	} else if(EQ(a, "-size"))
191	return(mk(size, (struct anode )atoi(b), (struct anode )s));
192	else if(EQ(a, "-links"))
193	return(mk(links, (struct anode )atoi(b), (struct anode )s));
194	else if(EQ(a, "-perm")) {
195	for(i=0; *b ; ++b) {
196	if(*b=='-') continue;
197	i <<= 3;
198	i = i + (*b - '0');
199	}
200	return(mk(perm, (struct anode )i, (struct anode )s));
201	}
202	else if(EQ(a, "-type")) {
203	i = s=='d' ? S_IFDIR :
204	s=='b' ? S_IFBLK :
205	s=='c' ? S_IFCHR :
206	s=='f' ? 0100000 :
207	0;
208	return(mk(type, (struct anode )i, (struct anode )0));
209	}
210	else if (EQ(a, "-exec")) {
211	i = Ai - 1;
212	while(!EQ(nxtarg(), ";"));
213	return(mk(exeq, (struct anode )i, (struct anode )0));
214	}
215	else if (EQ(a, "-ok")) {
216	i = Ai - 1;
217	while(!EQ(nxtarg(), ";"));
218	return(mk(ok, (struct anode )i, (struct anode )0));
219	}
220	else if(EQ(a, "-cpio")) {
221	if((Cpio = creat(b, 0666)) < 0) {
222	fprintf(stderr, "find: cannot create < %s >\n", s);
223	exit(1);
224	}
225	Buf = (short *)sbrk(512);
226	Wp = Dbuf = (short *)sbrk(5120);
227	return(mk(cpio, (struct anode )0, (struct anode )0));
228	}
229	else if(EQ(a, "-newer")) {
230	if(stat(b, &Statb) < 0) {
231	fprintf(stderr, "find: cannot access < %s >\n", b);
232	exit(1);
233	}
234	Newer = Statb.st_mtime;
235	return mk(newer, (struct anode )0, (struct anode )0);
236	}
237	err: fprintf(stderr, "find: bad option < %s >\n", a);
238	exit(1);
239	}
240	struct anode *mk(f, l, r)
241	int (*f)();
242	struct anode l, r;
243	{
244	Node[Nn].F = f;
245	Node[Nn].L = l;
246	Node[Nn].R = r;
247	return(&(Node[Nn++]));
248	}
249
250	char nxtarg() { / get next arg from command line */
251	static strikes = 0;
252
253	if(strikes==3) {
254	fprintf(stderr, "find: incomplete statement\n");
255	exit(1);
256	}
257	if(Ai>=Argc) {
258	strikes++;
259	Ai = Argc + 1;
260	return("");
261	}
262	return(Argv[Ai++]);
263	}
264
265	/* execution time functions */
266	and(p)
267	register struct anode *p;
268	{
269	return(((p->L->F)(p->L)) && ((p->R->F)(p->R))?1:0);
270	}
271	or(p)
272	register struct anode *p;
273	{
274	return(((p->L->F)(p->L)) \|\| ((p->R->F)(p->R))?1:0);
275	}
276	not(p)
277	register struct anode *p;
278	{
279	return( !((*p->L->F)(p->L)));
280	}
281	glob(p)
282	register struct { int f; char pat; } p;
283	{
284	return(gmatch(Fname, p->pat));
285	}
286	print()
287	{
288	puts(Pathname);
289	return(1);
290	}
291	mtime(p)
292	register struct { int f, t, s; } *p;
293	{
294	return(scomp((int)((Now - Statb.st_mtime) / A_DAY), p->t, p->s));
295	}
296	atime(p)
297	register struct { int f, t, s; } *p;
298	{
299	return(scomp((int)((Now - Statb.st_atime) / A_DAY), p->t, p->s));
300	}
301	user(p)
302	register struct { int f, u, s; } *p;
303	{
304	return(scomp(Statb.st_uid, p->u, p->s));
305	}
306	ino(p)
307	register struct { int f, u, s; } *p;
308	{
309	return(scomp((int)Statb.st_ino, p->u, p->s));
310	}
311	group(p)
312	register struct { int f, u; } *p;
313	{
314	return(p->u == Statb.st_gid);
315	}
316	links(p)
317	register struct { int f, link, s; } *p;
318	{
319	return(scomp(Statb.st_nlink, p->link, p->s));
320	}
321	size(p)
322	register struct { int f, sz, s; } *p;
323	{
324	return(scomp((int)((Statb.st_size+511)>>9), p->sz, p->s));
325	}
326	perm(p)
327	register struct { int f, per, s; } *p;
328	{
329	register i;
330	i = (p->s=='-') ? p->per : 07777; /* '-' means only arg bits */
331	return((Statb.st_mode & i & 07777) == p->per);
332	}
333	type(p)
334	register struct { int f, per, s; } *p;
335	{
336	return((Statb.st_mode&S_IFMT)==p->per);
337	}
338	exeq(p)
339	register struct { int f, com; } *p;
340	{
341	fflush(stdout); /* to flush possible `-print' */
342	return(doex(p->com));
343	}
344	ok(p)
345	struct { int f, com; } *p;
346	{
347	char c; int yes;
348	yes = 0;
349	fflush(stdout); /* to flush possible `-print' */
350	fprintf(stderr, "< %s ... %s > ? ", Argv[p->com], Pathname);
351	fflush(stderr);
352	if((c=getchar())=='y') yes = 1;
353	while(c!='\n') c = getchar();
354	if(yes) return(doex(p->com));
355	return(0);
356	}
357
358	#define MKSHORT(v, lv) {U.l=1L;if(U.c[0]) U.l=lv, v[0]=U.s[1], v[1]=U.s[0]; else U.l=lv, v[0]=U.s[0], v[1]=U.s[1];}
359	union { long l; short s[2]; char c[4]; } U;
360	long mklong(v)
361	short v[];
362	{
363	U.l = 1;
364	if(U.c[0] /* VAX */)
365	U.s[0] = v[1], U.s[1] = v[0];
366	else
367	U.s[0] = v[0], U.s[1] = v[1];
368	return U.l;
369	}
370	cpio()
371	{
372	#define MAGIC 070707
373	struct header {
374	short h_magic,
375	h_dev,
376	h_ino,
377	h_mode,
378	h_uid,
379	h_gid,
380	h_nlink,
381	h_rdev;
382	short h_mtime[2];
383	short h_namesize;
384	short h_filesize[2];
385	char h_name[256];
386	} hdr;
387	register ifile, ct;
388	static long fsz;
389	register i;
390
391	hdr.h_magic = MAGIC;
392	strcpy(hdr.h_name, !strncmp(Pathname, "./", 2)? Pathname+2: Pathname);
393	hdr.h_namesize = strlen(hdr.h_name) + 1;
394	hdr.h_uid = Statb.st_uid;
395	hdr.h_gid = Statb.st_gid;
396	hdr.h_dev = Statb.st_dev;
397	hdr.h_ino = Statb.st_ino;
398	hdr.h_mode = Statb.st_mode;
399	MKSHORT(hdr.h_mtime, Statb.st_mtime);
400	hdr.h_nlink = Statb.st_nlink;
401	fsz = hdr.h_mode & S_IFREG? Statb.st_size: 0L;
402	MKSHORT(hdr.h_filesize, fsz);
403	hdr.h_rdev = Statb.st_rdev;
404	if(EQ(hdr.h_name, "TRAILER!!!")) {
405	bwrite((short *)&hdr, (sizeof hdr-256)+hdr.h_namesize);
406	for(i = 0; i < 10; ++i)
407	bwrite(Buf, 512);
408	return;
409	}
410	if(!mklong(hdr.h_filesize))
411	return;
412	if((ifile = open(Fname, 0)) < 0) {
413	cerror:
414	fprintf(stderr, "find: cannot copy < %s >\n", hdr.h_name);
415	return;
416	}
417	bwrite((short *)&hdr, (sizeof hdr-256)+hdr.h_namesize);
418	for(fsz = mklong(hdr.h_filesize); fsz > 0; fsz -= 512) {
419	ct = fsz>512? 512: fsz;
420	if(read(ifile, (char *)Buf, ct) < 0)
421	goto cerror;
422	bwrite(Buf, ct);
423	}
424	close(ifile);
425	return;
426	}
427	newer()
428	{
429	return Statb.st_mtime > Newer;
430	}
431
432	/* support functions */
433	scomp(a, b, s) /* funny signed compare */
434	register a, b;
435	register char s;
436	{
437	if(s == '+')
438	return(a > b);
439	if(s == '-')
440	return(a < (b * -1));
441	return(a == b);
442	}
443
444	doex(com)
445	{
446	register np;
447	register char *na;
448	static char *nargv[50];
449	static ccode;
450
451	ccode = np = 0;
452	while (na=Argv[com++]) {
453	if(strcmp(na, ";")==0) break;
454	if(strcmp(na, "{}")==0) nargv[np++] = Pathname;
455	else nargv[np++] = na;
456	}
457	nargv[np] = 0;
458	if (np==0) return(9);
459	if(fork()) /parent/ wait(&ccode);
460	else { /child/
461	chdir(Home);
462	execvp(nargv[0], nargv, np);
463	exit(1);
464	}
465	return(ccode ? 0:1);
466	}
467
468	getunum(f, s) char f, s; { /* find user/group name and return number */
469	register i;
470	register char *sp;
471	register c;
472	char str[20];
473	FILE *pin;
474
475	i = -1;
476	pin = fopen(f, "r");
477	c = '\n'; /* prime with a CR */
478	do {
479	if(c=='\n') {
480	sp = str;
481	while((c = *sp++ = getc(pin)) != ':')
482	if(c == EOF) goto RET;
483	*--sp = '\0';
484	if(EQ(str, s)) {
485	while((c=getc(pin)) != ':')
486	if(c == EOF) goto RET;
487	sp = str;
488	while((*sp = getc(pin)) != ':') sp++;
489	*sp = '\0';
490	i = atoi(str);
491	goto RET;
492	}
493	}
494	} while((c = getc(pin)) != EOF);
495	RET:
496	fclose(pin);
497	return(i);
498	}
499
500	descend(name, fname, exlist)
501	struct anode *exlist;
502	char name, fname;
503	{
504	int dir = 0, /* open directory */
505	offset,
506	dsize,
507	entries,
508	dirsize;
509	struct direct dentry[BUFSIZ / sizeof (struct direct)];
510	register struct direct *dp;
511	register char c1, c2;
512	int i;
513	int rv = 0;
514	char *endofname;
515
516	if(stat(fname, &Statb)<0) {
517	fprintf(stderr, "find: bad status < %s >\n", name);
518	return(0);
519	}
520	(*exlist->F)(exlist);
521	if((Statb.st_mode&S_IFMT)!=S_IFDIR)
522	return(1);
523
524	for(c1 = name; *c1; ++c1);
525	if(*(c1-1) == '/')
526	--c1;
527	endofname = c1;
528	dirsize = Statb.st_size;
529
530	if(chdir(fname) == -1)
531	return(0);
532	for(offset=0 ; offset < dirsize ; offset += BUFSIZ) { /* each block */
533	dsize = BUFSIZ<(dirsize-offset)? BUFSIZ: (dirsize-offset);
534	if(!dir) {
535	if((dir=open(".", 0))<0) {
536	fprintf(stderr, "find: cannot open < %s >\n",
537	name);
538	rv = 0;
539	goto ret;
540	}
541	if(offset) lseek(dir, (long)offset, 0);
542	if(read(dir, (char *)dentry, dsize)<0) {
543	fprintf(stderr, "find: cannot read < %s >\n",
544	name);
545	rv = 0;
546	goto ret;
547	}
548	if(dir > 10) {
549	close(dir);
550	dir = 0;
551	}
552	} else
553	if(read(dir, (char *)dentry, dsize)<0) {
554	fprintf(stderr, "find: cannot read < %s >\n",
555	name);
556	rv = 0;
557	goto ret;
558	}
559	for(dp=dentry, entries=dsize>>4; entries; --entries, ++dp) { /* each directory entry */
560	if(dp->d_ino==0
561	\|\| (dp->d_name[0]=='.' && dp->d_name[1]=='\0')
562	\|\| (dp->d_name[0]=='.' && dp->d_name[1]=='.' && dp->d_name[2]=='\0'))
563	continue;
564	c1 = endofname;
565	*c1++ = '/';
566	c2 = dp->d_name;
567	for(i=0; i<14; ++i)
568	if(*c2)
569	c1++ = c2++;
570	else
571	break;
572	*c1 = '\0';
573	if(c1 == endofname) { /* ?? */
574	rv = 0;
575	goto ret;
576	}
577	Fname = endofname+1;
578	if(!descend(name, Fname, exlist)) {
579	*endofname = '\0';
580	chdir(Home);
581	if(chdir(Pathname) == -1) {
582	fprintf(stderr, "find: bad directory tree\n");
583	exit(1);
584	}
585	}
586	}
587	}
588	rv = 1;
589	ret:
590	if(dir)
591	close(dir);
592	if(chdir("..") == -1) {
593	*endofname = '\0';
594	fprintf(stderr, "find: bad directory <%s>\n", name);
595	rv = 1;
596	}
597	return(rv);
598	}
599
600	gmatch(s, p) /* string match as in glob */
601	register char s, p;
602	{
603	if (s=='.' && p!='.') return(0);
604	return amatch(s, p);
605	}
606
607	amatch(s, p)
608	register char s, p;
609	{
610	register cc;
611	int scc, k;
612	int c, lc;
613
614	scc = *s;
615	lc = 077777;
616	switch (c = *p) {
617
618	case '[':
619	k = 0;
620	while (cc = *++p) {
621	switch (cc) {
622
623	case ']':
624	if (k)
625	return(amatch(++s, ++p));
626	else
627	return(0);
628
629	case '-':
630	k \|= lc <= scc & scc <= (cc=p[1]);
631	}
632	if (scc==(lc=cc)) k++;
633	}
634	return(0);
635
636	case '?':
637	caseq:
638	if(scc) return(amatch(++s, ++p));
639	return(0);
640	case '*':
641	return(umatch(s, ++p));
642	case 0:
643	return(!scc);
644	}
645	if (c==scc) goto caseq;
646	return(0);
647	}
648
649	umatch(s, p)
650	register char s, p;
651	{
652	if(*p==0) return(1);
653	while(*s)
654	if (amatch(s++, p)) return(1);
655	return(0);
656	}
657
658	bwrite(rp, c)
659	register short *rp;
660	register c;
661	{
662	register short *wp = Wp;
663
664	c = (c+1) >> 1;
665	while(c--) {
666	if(!Wct) {
667	again:
668	if(write(Cpio, (char *)Dbuf, Bufsize)<0) {
669	Cpio = chgreel(1, Cpio);
670	goto again;
671	}
672	Wct = Bufsize >> 1;
673	wp = Dbuf;
674	++Blocks;
675	}
676	wp++ = rp++;
677	--Wct;
678	}
679	Wp = wp;
680	}
681	chgreel(x, fl)
682	{
683	register f;
684	char str[22];
685	FILE *devtty;
686	struct stat statb;
687	extern errno;
688
689	fprintf(stderr, "find: errno: %d, ", errno);
690	fprintf(stderr, "find: can't %s\n", x? "write output": "read input");
691	fstat(fl, &statb);
692	if((statb.st_mode&S_IFMT) != S_IFCHR)
693	exit(1);
694	again:
695	fprintf(stderr, "If you want to go on, type device/file name %s\n",
696	"when ready");
697	devtty = fopen("/dev/tty", "r");
698	fgets(str, 20, devtty);
699	str[strlen(str) - 1] = '\0';
700	if(!*str)
701	exit(1);
702	close(fl);
703	if((f = open(str, x? 1: 0)) < 0) {
704	fprintf(stderr, "That didn't work");
705	fclose(devtty);
706	goto again;
707	}
708	return f;
709	}