add directory study

study/linux-travel/MINIX-1.5/1.5/Source/commands/sh/Makefile

@@ -0,0 +1,10 @@
+CFLAGS=-F -D_POSIX_SOURCE
+l=/lib
+
+shobj = sh1.s sh2.s sh3.s sh4.s sh5.s sh6.s
+sh:	$(shobj) sh.h
+	cc -i -o sh -T.  $(shobj)
+	@chmem =18000 sh
+
+clean:	
+	@rm -f *.bak *.s sh

study/linux-travel/MINIX-1.5/1.5/Source/commands/sh/Makefile.68K

@@ -0,0 +1,18 @@
+
+CFLAGS	= -O -DATARI_ST
+
+CMD	= sh
+OBJ	= sh1.o sh2.o sh3.o sh4.o sh5.o sh6.o
+
+all:	$(CMD)
+
+clean:
+	rm -f $(CMD) *.o
+
+
+
+$(CMD):	$(OBJ)
+	$(CC) -o $@ $(OBJ)
+	chmem =15000 $@
+
+$(OBJ):	sh.h

study/linux-travel/MINIX-1.5/1.5/Source/commands/sh/sh.h

@@ -0,0 +1,350 @@
+/* -------- sh.h -------- */
+/*
+ * shell
+ */
+
+#define NULL    0
+#define	LINELIM	1000
+#define	NPUSH	8	/* limit to input nesting */
+
+#define	NOFILE	20	/* Number of open files */
+#define	NUFILE	10	/* Number of user-accessible files */
+#define	FDBASE	10	/* First file usable by Shell */
+
+/*
+ * values returned by wait
+ */
+#define	WAITSIG(s) ((s)&0177)
+#define	WAITVAL(s) (((s)>>8)&0377)
+#define	WAITCORE(s) (((s)&0200)!=0)
+
+/*
+ * library and system defintions
+ */
+typedef char * xint;	/* base type of jmp_buf, for broken compilers */
+
+/*
+ * shell components
+ */
+/* #include "area.h" */
+/* #include "word.h" */
+/* #include "io.h" */
+/* #include "var.h" */
+
+#define	QUOTE	0200
+
+#define	NOBLOCK	((struct op *)NULL)
+#define	NOWORD	((char *)NULL)
+#define	NOWORDS	((char **)NULL)
+#define	NOPIPE	((int *)NULL)
+
+/*
+ * Description of a command or an operation on commands.
+ * Might eventually use a union.
+ */
+struct op {
+	int	type;	/* operation type, see below */
+	char	**words;	/* arguments to a command */
+	struct	ioword	**ioact;	/* IO actions (eg, < > >>) */
+	struct op *left;
+	struct op *right;
+	char	*str;	/* identifier for case and for */
+};
+
+#define	TCOM	1	/* command */
+#define	TPAREN	2	/* (c-list) */
+#define	TPIPE	3	/* a | b */
+#define	TLIST	4	/* a [&;] b */
+#define	TOR	5	/* || */
+#define	TAND	6	/* && */
+#define	TFOR	7
+#define	TDO	8
+#define	TCASE	9
+#define	TIF	10
+#define	TWHILE	11
+#define	TUNTIL	12
+#define	TELIF	13
+#define	TPAT	14	/* pattern in case */
+#define	TBRACE	15	/* {c-list} */
+#define	TASYNC	16	/* c & */
+
+/*
+ * actions determining the environment of a process
+ */
+#define	BIT(i)	(1<<(i))
+#define	FEXEC	BIT(0)	/* execute without forking */
+
+/*
+ * flags to control evaluation of words
+ */
+#define	DOSUB	1	/* interpret $, `, and quotes */
+#define	DOBLANK	2	/* perform blank interpretation */
+#define	DOGLOB	4	/* interpret [?* */
+#define	DOKEY	8	/* move words with `=' to 2nd arg. list */
+#define	DOTRIM	16	/* trim resulting string */
+
+#define	DOALL	(DOSUB|DOBLANK|DOGLOB|DOKEY|DOTRIM)
+
+Extern	char	**dolv;
+Extern	int	dolc;
+Extern	int	exstat;
+Extern  char	gflg;
+Extern  int	talking;	/* interactive (talking-type wireless) */
+Extern  int	execflg;
+Extern  int	multiline;	/* \n changed to ; */
+Extern  struct	op	*outtree;	/* result from parser */
+
+Extern	xint	*failpt;
+Extern	xint	*errpt;
+
+struct	brkcon {
+	jmp_buf	brkpt;
+	struct	brkcon	*nextlev;
+} ;
+Extern	struct brkcon	*brklist;
+Extern	int	isbreak;
+
+/*
+ * redirection
+ */
+struct ioword {
+	short	io_unit;	/* unit affected */
+	short	io_flag;	/* action (below) */
+	char	*io_name;	/* file name */
+};
+#define	IOREAD	1	/* < */
+#define	IOHERE	2	/* << (here file) */
+#define	IOWRITE	4	/* > */
+#define	IOCAT	8	/* >> */
+#define	IOXHERE	16	/* ${}, ` in << */
+#define	IODUP	32	/* >&digit */
+#define	IOCLOSE	64	/* >&- */
+
+#define	IODEFAULT (-1)	/* token for default IO unit */
+
+Extern	struct	wdblock	*wdlist;
+Extern	struct	wdblock	*iolist;
+
+/*
+ * parsing & execution environment
+ */
+extern struct	env {
+	char	*linep;
+	struct	io	*iobase;
+	struct	io	*iop;
+	xint	*errpt;
+	int	iofd;
+	struct	env	*oenv;
+} e;
+
+/*
+ * flags:
+ * -e: quit on error
+ * -k: look for name=value everywhere on command line
+ * -n: no execution
+ * -t: exit after reading and executing one command
+ * -v: echo as read
+ * -x: trace
+ * -u: unset variables net diagnostic
+ */
+extern	char	*flag;
+
+extern	char	*null;	/* null value for variable */
+extern	int	intr;	/* interrupt pending */
+
+Extern	char	*trap[_NSIG+1];
+Extern	char	ourtrap[_NSIG+1];
+Extern	int	trapset;	/* trap pending */
+
+extern	int	heedint;	/* heed interrupt signals */
+
+Extern	int	yynerrs;	/* yacc */
+
+Extern	char	line[LINELIM];
+extern	char	*elinep;
+
+/*
+ * other functions
+ */
+int	(*inbuilt())();	/* find builtin command */
+char	*rexecve();
+char	*space();
+char	*getwd();
+char	*strsave();
+char	*evalstr();
+char	*putn();
+char	*itoa();
+char	*unquote();
+struct	var	*lookup();
+struct	wdblock	*add2args();
+struct	wdblock	*glob();
+char	**makenv();
+struct	ioword	*addio();
+char	**eval();
+int	setstatus();
+int	waitfor();
+
+void	onintr();	/* SIGINT handler */
+
+/*
+ * error handling
+ */
+void	leave();	/* abort shell (or fail in subshell) */
+void	fail();		/* fail but return to process next command */
+void	sig();		/* default signal handler */
+
+/*
+ * library functions and system calls
+ */
+long	lseek();
+char	*strncpy();
+int	strlen();
+extern int errno;
+
+/* -------- var.h -------- */
+
+struct	var {
+	char	*value;
+	char	*name;
+	struct	var	*next;
+	char	status;
+};
+#define	COPYV	1	/* flag to setval, suggesting copy */
+#define	RONLY	01	/* variable is read-only */
+#define	EXPORT	02	/* variable is to be exported */
+#define	GETCELL	04	/* name & value space was got with getcell */
+
+Extern	struct	var	*vlist;		/* dictionary */
+
+Extern	struct	var	*homedir;	/* home directory */
+Extern	struct	var	*prompt;	/* main prompt */
+Extern	struct	var	*cprompt;	/* continuation prompt */
+Extern	struct	var	*path;		/* search path for commands */
+Extern	struct	var	*shell;		/* shell to interpret command files */
+Extern	struct	var	*ifs;		/* field separators */
+
+struct	var	*lookup(/* char *s */);
+void	setval(/* struct var *, char * */);
+void	nameval(/* struct var *, char *val, *name */);
+void	export(/* struct var * */);
+void	ronly(/* struct var * */);
+int	isassign(/* char *s */);
+int	checkname(/* char *name */);
+int	assign(/* char *s, int copyflag */);
+void	putvlist(/* int key, int fd */);
+int	eqname(/* char *n1, char *n2 */);
+
+/* -------- io.h -------- */
+/* io buffer */
+struct iobuf {
+  unsigned id;				/* buffer id */
+  char buf[512];			/* buffer */
+  char *bufp;				/* pointer into buffer */
+  char *ebufp;				/* pointer to end of buffer */
+};
+
+/* possible arguments to an IO function */
+struct ioarg {
+	char	*aword;
+	char	**awordlist;
+	int	afile;		/* file descriptor */
+	unsigned afid;		/* buffer id */
+	long	afpos;		/* file position */
+	struct iobuf *afbuf;	/* buffer for this file */
+};
+Extern struct ioarg ioargstack[NPUSH];
+#define AFID_NOBUF	(~0)
+#define AFID_ID		0
+
+/* an input generator's state */
+struct	io {
+	int	(*iofn)();
+	struct	ioarg	*argp;
+	int	peekc;
+	char	prev;		/* previous character read by readc() */
+	char	nlcount;	/* for `'s */
+	char	xchar;		/* for `'s */
+	char	task;		/* reason for pushed IO */
+};
+Extern	struct	io	iostack[NPUSH];
+#define	XOTHER	0	/* none of the below */
+#define	XDOLL	1	/* expanding ${} */
+#define	XGRAVE	2	/* expanding `'s */
+#define	XIO	3	/* file IO */
+
+/* in substitution */
+#define	INSUB()	(e.iop->task == XGRAVE || e.iop->task == XDOLL)
+
+/*
+ * input generators for IO structure
+ */
+int	nlchar();
+int	strchar();
+int	qstrchar();
+int	filechar();
+int	herechar();
+int	linechar();
+int	gravechar();
+int	qgravechar();
+int	dolchar();
+int	wdchar();
+
+/*
+ * IO functions
+ */
+int	eofc();
+int	getc();
+int	readc();
+void	unget();
+void	ioecho();
+void	prs();
+void	putc();
+void	prn();
+void	closef();
+void	closeall();
+
+/*
+ * IO control
+ */
+void	pushio(/* struct ioarg arg, int (*gen)() */);
+int	remap();
+int	openpipe();
+void	closepipe();
+struct io *setbase(/* struct io * */);
+
+extern	struct	ioarg	temparg;	/* temporary for PUSHIO */
+#define	PUSHIO(what,arg,gen) ((temparg.what = (arg)),pushio(&temparg,(gen)))
+#define	RUN(what,arg,gen) ((temparg.what = (arg)), run(&temparg,(gen)))
+
+/* -------- word.h -------- */
+#ifndef WORD_H
+#define	WORD_H	1
+struct	wdblock {
+	short	w_bsize;
+	short	w_nword;
+	/* bounds are arbitrary */
+	char	*w_words[1];
+};
+
+struct	wdblock	*addword();
+struct	wdblock	*newword();
+char	**getwords();
+#endif
+
+/* -------- area.h -------- */
+
+/*
+ * storage allocation
+ */
+char	*getcell(/* unsigned size */);
+void	garbage();
+void	setarea(/* char *obj, int to */);
+int	getarea(/* char *obj */);
+void	freearea(/* int area */);
+void	freecell(/* char *obj */);
+
+Extern	int	areanum;	/* current allocation area */
+
+#define	NEW(type) (type *)getcell(sizeof(type))
+#define	DELETE(obj)	freecell((char *)obj)
+

study/linux-travel/MINIX-1.5/1.5/Source/commands/sh/sh1.c

@@ -0,0 +1,932 @@
+#define Extern extern
+#include <sys/types.h>
+#include <signal.h>
+#include <errno.h>
+#include <setjmp.h>
+#include "sh.h"
+/* -------- sh.c -------- */
+/*
+ * shell
+ */
+
+/* #include "sh.h" */
+
+int	intr;
+int	inparse;
+char	flags['z'-'a'+1];
+char	*flag = flags-'a';
+char	*elinep = line+sizeof(line)-5;
+char	*null	= "";
+int	heedint =1;
+struct	env	e ={line, iostack, iostack-1,
+		    (xint *)NULL, FDBASE, (struct env *)NULL};
+
+extern	char	**environ;	/* environment pointer */
+
+/*
+ * default shell, search rules
+ */
+char	shellname[] = "/bin/sh";
+char	search[] = ":/bin:/usr/bin";
+
+void	(*qflag)() = SIG_IGN;
+
+main(argc, argv)
+int argc;
+register char **argv;
+{
+	register int f;
+	register char *s;
+	int cflag;
+	char *name, **ap;
+	int (*iof)();
+
+	initarea();
+	if ((ap = environ) != NULL) {
+		while (*ap)
+			assign(*ap++, !COPYV);
+		for (ap = environ; *ap;)
+			export(lookup(*ap++));
+	}
+	closeall();
+	areanum = 1;
+
+	shell = lookup("SHELL");
+	if (shell->value == null)
+		setval(shell, shellname);
+	export(shell);
+
+	homedir = lookup("HOME");
+	if (homedir->value == null)
+		setval(homedir, "/");
+	export(homedir);
+
+	setval(lookup("$"), itoa(getpid(), 5));
+
+	path = lookup("PATH");
+	if (path->value == null)
+		setval(path, search);
+	export(path);
+
+	ifs = lookup("IFS");
+	if (ifs->value == null)
+		setval(ifs, " \t\n");
+
+	prompt = lookup("PS1");
+	if (prompt->value == null)
+#ifndef UNIXSHELL
+		setval(prompt, "$ ");
+#else
+		setval(prompt, "% ");
+#endif
+	if (geteuid() == 0) {
+		setval(prompt, "# ");
+		prompt->status &= ~EXPORT;
+	}
+	cprompt = lookup("PS2");
+	if (cprompt->value == null)
+		setval(cprompt, "> ");
+
+	iof = filechar;
+	cflag = 0;
+	name = *argv++;
+	if (--argc >= 1) {
+		if(argv[0][0] == '-' && argv[0][1] != '\0') {
+			for (s = argv[0]+1; *s; s++)
+				switch (*s) {
+				case 'c':
+					prompt->status &= ~EXPORT;
+					cprompt->status &= ~EXPORT;
+					setval(prompt, "");
+					setval(cprompt, "");
+					cflag = 1;
+					if (--argc > 0)
+						PUSHIO(aword, *++argv, iof = nlchar);
+					break;
+	
+				case 'q':
+					qflag = SIG_DFL;
+					break;
+
+				case 's':
+					/* standard input */
+					break;
+
+				case 't':
+					prompt->status &= ~EXPORT;
+					setval(prompt, "");
+					iof = linechar;
+					break;
+	
+				case 'i':
+					talking++;
+				default:
+					if (*s>='a' && *s<='z')
+						flag[*s]++;
+				}
+		} else {
+			argv--;
+			argc++;
+		}
+		if (iof == filechar && --argc > 0) {
+			setval(prompt, "");
+			setval(cprompt, "");
+			prompt->status &= ~EXPORT;
+			cprompt->status &= ~EXPORT;
+			if (newfile(name = *++argv))
+				exit(1);
+		}
+	}
+	setdash();
+	if (e.iop < iostack) {
+		PUSHIO(afile, 0, iof);
+		if (isatty(0) && isatty(1) && !cflag)
+			talking++;
+	}
+	signal(SIGQUIT, qflag);
+	if (name && name[0] == '-') {
+		talking++;
+		if ((f = open(".profile", 0)) >= 0)
+			next(remap(f));
+		if ((f = open("/etc/profile", 0)) >= 0)
+			next(remap(f));
+	}
+	if (talking)
+		signal(SIGTERM, sig);
+	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
+		signal(SIGINT, onintr);
+	dolv = argv;
+	dolc = argc;
+	dolv[0] = name;
+	if (dolc > 1)
+		for (ap = ++argv; --argc > 0;)
+			if (assign(*ap = *argv++, !COPYV))
+				dolc--;	/* keyword */
+			else
+				ap++;
+	setval(lookup("#"), putn((--dolc < 0) ? (dolc = 0) : dolc));
+
+	for (;;) {
+		if (talking && e.iop <= iostack)
+			prs(prompt->value);
+		onecommand();
+	}
+}
+
+setdash()
+{
+	register char *cp, c;
+	char m['z'-'a'+1];
+
+	cp = m;
+	for (c='a'; c<='z'; c++)
+		if (flag[c])
+			*cp++ = c;
+	*cp = 0;
+	setval(lookup("-"), m);
+}
+
+newfile(s)
+register char *s;
+{
+	register f;
+
+	if (strcmp(s, "-") != 0) {
+		f = open(s, 0);
+		if (f < 0) {
+			prs(s);
+			err(": cannot open");
+			return(1);
+		}
+	} else
+		f = 0;
+	next(remap(f));
+	return(0);
+}
+
+onecommand()
+{
+	register i;
+	jmp_buf m1;
+
+	while (e.oenv)
+		quitenv();
+	areanum = 1;
+	freehere(areanum);
+	freearea(areanum);
+	garbage();
+	wdlist = 0;
+	iolist = 0;
+	e.errpt = 0;
+	e.linep = line;
+	yynerrs = 0;
+	multiline = 0;
+	inparse = 1;
+	intr = 0;
+	execflg = 0;
+	setjmp(failpt = m1);	/* Bruce Evans' fix */
+	if (setjmp(failpt = m1) || yyparse() || intr) {
+		while (e.oenv)
+			quitenv();
+		scraphere();
+		if (!talking && intr)
+			leave();
+		inparse = 0;
+		intr = 0;
+		return;
+	}
+	inparse = 0;
+	brklist = 0;
+	intr = 0;
+	execflg = 0;
+	if (!flag['n'])
+		execute(outtree, NOPIPE, NOPIPE, 0);
+	if (!talking && intr) {
+		execflg = 0;
+		leave();
+	}
+	if ((i = trapset) != 0) {
+		trapset = 0;
+		runtrap(i);
+	}
+}
+
+void
+fail()
+{
+	longjmp(failpt, 1);
+	/* NOTREACHED */
+}
+
+void
+leave()
+{
+	if (execflg)
+		fail();
+	scraphere();
+	freehere(1);
+	runtrap(0);
+	exit(exstat);
+	/* NOTREACHED */
+}
+
+warn(s)
+register char *s;
+{
+	if(*s) {
+		prs(s);
+		exstat = -1;
+	}
+	prs("\n");
+	if (flag['e'])
+		leave();
+}
+
+err(s)
+char *s;
+{
+	warn(s);
+	if (flag['n'])
+		return;
+	if (!talking)
+		leave();
+	if (e.errpt)
+		longjmp(e.errpt, 1);
+	closeall();
+	e.iop = e.iobase = iostack;
+}
+
+newenv(f)
+{
+	register struct env *ep;
+
+	if (f) {
+		quitenv();
+		return(1);
+	}
+	ep = (struct env *) space(sizeof(*ep));
+	if (ep == NULL) {
+		while (e.oenv)
+			quitenv();
+		fail();
+	}
+	*ep = e;
+	e.oenv = ep;
+	e.errpt = errpt;
+	return(0);
+}
+
+quitenv()
+{
+	register struct env *ep;
+	register fd;
+
+	if ((ep = e.oenv) != NULL) {
+		fd = e.iofd;
+		e = *ep;
+		/* should close `'d files */
+		DELETE(ep);
+		while (--fd >= e.iofd)
+			close(fd);
+	}
+}
+
+/*
+ * Is any character from s1 in s2?
+ */
+int
+anys(s1, s2)
+register char *s1, *s2;
+{
+	while (*s1)
+		if (any(*s1++, s2))
+			return(1);
+	return(0);
+}
+
+/*
+ * Is character c in s?
+ */
+int
+any(c, s)
+register int c;
+register char *s;
+{
+	while (*s)
+		if (*s++ == c)
+			return(1);
+	return(0);
+}
+
+char *
+putn(n)
+register n;
+{
+	return(itoa(n, -1));
+}
+
+char *
+itoa(u, n)
+register unsigned u;
+{
+	register char *cp;
+	static char s[20];
+	int m;
+
+	m = 0;
+	if (n < 0 && (int) u < 0) {
+		m++;
+		u = -u;
+	}
+	cp = s+sizeof(s);
+	*--cp = 0;
+	do {
+		*--cp = u%10 + '0';
+		u /= 10;
+	} while (--n > 0 || u);
+	if (m)
+		*--cp = '-';
+	return(cp);
+}
+
+next(f)
+{
+	PUSHIO(afile, f, filechar);
+}
+
+void onintr()
+{
+	signal(SIGINT, onintr);
+	intr = 1;
+	if (talking) {
+		if (inparse) {
+			prs("\n");
+			fail();
+		}
+	}
+	else if (heedint) {
+		execflg = 0;
+		leave();
+	}
+}
+
+letter(c)
+register c;
+{
+	return(c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c == '_');
+}
+
+digit(c)
+register c;
+{
+	return(c >= '0' && c <= '9');
+}
+
+letnum(c)
+register c;
+{
+	return(letter(c) || digit(c));
+}
+
+char *
+space(n)
+int n;
+{
+	register char *cp;
+
+	if ((cp = getcell(n)) == 0)
+		err("out of string space");
+	return(cp);
+}
+
+char *
+strsave(s, a)
+register char *s;
+{
+	register char *cp, *xp;
+
+	if ((cp = space(strlen(s)+1)) != NULL) {
+		setarea((char *)cp, a);
+		for (xp = cp; (*xp++ = *s++) != '\0';)
+			;
+		return(cp);
+	}
+	return("");
+}
+
+xfree(s)
+register char *s;
+{
+	DELETE(s);
+}
+
+/*
+ * trap handling
+ */
+void sig(i)
+register i;
+{
+	trapset = i;
+	signal(i, sig);
+}
+
+runtrap(i)
+{
+	char *trapstr;
+
+	if ((trapstr = trap[i]) == NULL)
+		return;
+	if (i == 0)
+		trap[i] = 0;
+	RUN(aword, trapstr, nlchar);
+}
+
+/* -------- var.c -------- */
+/* #include "sh.h" */
+
+static	char	*findeq();
+
+/*
+ * Find the given name in the dictionary
+ * and return its value.  If the name was
+ * not previously there, enter it now and
+ * return a null value.
+ */
+struct var *
+lookup(n)
+register char *n;
+{
+	register struct var *vp;
+	register char *cp;
+	register int c;
+	static struct var dummy;
+
+	if (digit(*n)) {
+		dummy.name = n;
+		for (c = 0; digit(*n) && c < 1000; n++)
+			c = c*10 + *n-'0';
+		dummy.status = RONLY;
+		dummy.value = c <= dolc? dolv[c]: null;
+		return(&dummy);
+	}
+	for (vp = vlist; vp; vp = vp->next)
+		if (eqname(vp->name, n))
+			return(vp);
+	cp = findeq(n);
+	vp = (struct var *)space(sizeof(*vp));
+	if (vp == 0 || (vp->name = space((int)(cp-n)+2)) == 0) {
+		dummy.name = dummy.value = "";
+		return(&dummy);
+	}
+	for (cp = vp->name; (*cp = *n++) && *cp != '='; cp++)
+		;
+	if (*cp == 0)
+		*cp = '=';
+	*++cp = 0;
+	setarea((char *)vp, 0);
+	setarea((char *)vp->name, 0);
+	vp->value = null;
+	vp->next = vlist;
+	vp->status = GETCELL;
+	vlist = vp;
+	return(vp);
+}
+
+/*
+ * give variable at `vp' the value `val'.
+ */
+void
+setval(vp, val)
+struct var *vp;
+char *val;
+{
+	nameval(vp, val, (char *)NULL);
+}
+
+/*
+ * if name is not NULL, it must be
+ * a prefix of the space `val',
+ * and end with `='.
+ * this is all so that exporting
+ * values is reasonably painless.
+ */
+void
+nameval(vp, val, name)
+register struct var *vp;
+char *val, *name;
+{
+	register char *cp, *xp;
+	char *nv;
+	int fl;
+
+	if (vp->status & RONLY) {
+		for (xp = vp->name; *xp && *xp != '=';)
+			putc(*xp++);
+		err(" is read-only");
+		return;
+	}
+	fl = 0;
+	if (name == NULL) {
+		xp = space(strlen(vp->name)+strlen(val)+2);
+		if (xp == 0)
+			return;
+		/* make string:  name=value */
+		setarea((char *)xp, 0);
+		name = xp;
+		for (cp = vp->name; (*xp = *cp++) && *xp!='='; xp++)
+			;
+		if (*xp++ == 0)
+			xp[-1] = '=';
+		nv = xp;
+		for (cp = val; (*xp++ = *cp++) != '\0';)
+			;
+		val = nv;
+		fl = GETCELL;
+	}
+	if (vp->status & GETCELL)
+		xfree(vp->name);	/* form new string `name=value' */
+	vp->name = name;
+	vp->value = val;
+	vp->status |= fl;
+}
+
+void
+export(vp)
+struct var *vp;
+{
+	vp->status |= EXPORT;
+}
+
+void
+ronly(vp)
+struct var *vp;
+{
+	if (letter(vp->name[0]))	/* not an internal symbol ($# etc) */
+		vp->status |= RONLY;
+}
+
+int
+isassign(s)
+register char *s;
+{
+	if (!letter(*s))
+		return(0);
+	for (; *s != '='; s++)
+		if (*s == 0 || !letnum(*s))
+			return(0);
+	return(1);
+}
+
+int
+assign(s, cf)
+register char *s;
+int cf;
+{
+	register char *cp;
+	struct var *vp;
+
+	if (!letter(*s))
+		return(0);
+	for (cp = s; *cp != '='; cp++)
+		if (*cp == 0 || !letnum(*cp))
+			return(0);
+	vp = lookup(s);
+	nameval(vp, ++cp, cf == COPYV? (char *)NULL: s);
+	if (cf != COPYV)
+		vp->status &= ~GETCELL;
+	return(1);
+}
+
+int
+checkname(cp)
+register char *cp;
+{
+	if (!letter(*cp++))
+		return(0);
+	while (*cp)
+		if (!letnum(*cp++))
+			return(0);
+	return(1);
+}
+
+void
+putvlist(f, out)
+register int f, out;
+{
+	register struct var *vp;
+
+	for (vp = vlist; vp; vp = vp->next)
+		if (vp->status & f && letter(*vp->name)) {
+			if (vp->status & EXPORT)
+				write(out, "export ", 7);
+			if (vp->status & RONLY)
+				write(out, "readonly ", 9);
+			write(out, vp->name, (int)(findeq(vp->name) - vp->name));
+			write(out, "\n", 1);
+		}
+}
+
+int
+eqname(n1, n2)
+register char *n1, *n2;
+{
+	for (; *n1 != '=' && *n1 != 0; n1++)
+		if (*n2++ != *n1)
+			return(0);
+	return(*n2 == 0 || *n2 == '=');
+}
+
+static char *
+findeq(cp)
+register char *cp;
+{
+	while (*cp != '\0' && *cp != '=')
+		cp++;
+	return(cp);
+}
+
+/* -------- gmatch.c -------- */
+/*
+ * int gmatch(string, pattern)
+ * char *string, *pattern;
+ *
+ * Match a pattern as in sh(1).
+ */
+
+#define	NULL	0
+#define	CMASK	0377
+#define	QUOTE	0200
+#define	QMASK	(CMASK&~QUOTE)
+#define	NOT	'!'	/* might use ^ */
+
+static	char	*cclass();
+
+int
+gmatch(s, p)
+register char *s, *p;
+{
+	register int sc, pc;
+
+	if (s == NULL || p == NULL)
+		return(0);
+	while ((pc = *p++ & CMASK) != '\0') {
+		sc = *s++ & QMASK;
+		switch (pc) {
+		case '[':
+			if ((p = cclass(p, sc)) == NULL)
+				return(0);
+			break;
+
+		case '?':
+			if (sc == 0)
+				return(0);
+			break;
+
+		case '*':
+			s--;
+			do {
+				if (*p == '\0' || gmatch(s, p))
+					return(1);
+			} while (*s++ != '\0');
+			return(0);
+
+		default:
+			if (sc != (pc&~QUOTE))
+				return(0);
+		}
+	}
+	return(*s == 0);
+}
+
+static char *
+cclass(p, sub)
+register char *p;
+register int sub;
+{
+	register int c, d, not, found;
+
+	if ((not = *p == NOT) != 0)
+		p++;
+	found = not;
+	do {
+		if (*p == '\0')
+			return((char *)NULL);
+		c = *p & CMASK;
+		if (p[1] == '-' && p[2] != ']') {
+			d = p[2] & CMASK;
+			p++;
+		} else
+			d = c;
+		if (c == sub || c <= sub && sub <= d)
+			found = !not;
+	} while (*++p != ']');
+	return(found? p+1: (char *)NULL);
+}
+
+/* -------- area.c -------- */
+#define	REGSIZE		sizeof(struct region)
+#define GROWBY		256
+#undef	SHRINKBY	64
+#define FREE 32767
+#define BUSY 0
+#define	ALIGN (sizeof(int)-1)
+
+/* #include "area.h" */
+#define	NULL	0
+
+struct region {
+	struct	region *next;
+	int	area;
+};
+
+/*
+ * All memory between (char *)areabot and (char *)(areatop+1) is
+ * exclusively administered by the area management routines.
+ * It is assumed that sbrk() and brk() manipulate the high end.
+ */
+static	struct region *areabot;		/* bottom of area */
+static	struct region *areatop;		/* top of area */
+static	struct region *areanxt;		/* starting point of scan */
+char	*sbrk();
+char	*brk();
+
+initarea()
+{
+	while ((int)sbrk(0) & ALIGN)
+		sbrk(1);
+	areabot = (struct region *)sbrk(REGSIZE);
+	areabot->next = areabot;
+	areabot->area = BUSY;
+	areatop = areabot;
+	areanxt = areabot;
+}
+
+char *
+getcell(nbytes)
+unsigned nbytes;
+{
+	register int nregio;
+	register struct region *p, *q;
+	register i;
+
+	if (nbytes == 0)
+		abort();	/* silly and defeats the algorithm */
+	/*
+	 * round upwards and add administration area
+	 */
+	nregio = (nbytes+(REGSIZE-1))/REGSIZE + 1;
+	for (p = areanxt;;) {
+		if (p->area > areanum) {
+			/*
+			 * merge free cells
+			 */
+			while ((q = p->next)->area > areanum && q != areanxt)
+				p->next = q->next;
+			/*
+			 * exit loop if cell big enough
+			 */
+			if (q >= p + nregio)
+				goto found;
+		}
+		p = p->next;
+		if (p == areanxt)
+			break;
+	}
+	i = nregio >= GROWBY ? nregio : GROWBY;
+	p = (struct region *)sbrk(i * REGSIZE);
+	if (p == (struct region *)-1)
+		return((char *)NULL);
+	p--;
+	if (p != areatop)
+		abort();	/* allocated areas are contiguous */
+	q = p + i;
+	p->next = q;
+	p->area = FREE;
+	q->next = areabot;
+	q->area = BUSY;
+	areatop = q;
+found:
+	/*
+	 * we found a FREE area big enough, pointed to by 'p', and up to 'q'
+	 */
+	areanxt = p + nregio;
+	if (areanxt < q) {
+		/*
+		 * split into requested area and rest
+		 */
+		if (areanxt+1 > q)
+			abort();	/* insufficient space left for admin */
+		areanxt->next = q;
+		areanxt->area = FREE;
+		p->next = areanxt;
+	}
+	p->area = areanum;
+	return((char *)(p+1));
+}
+
+void
+freecell(cp)
+char *cp;
+{
+	register struct region *p;
+
+	if ((p = (struct region *)cp) != NULL) {
+		p--;
+		if (p < areanxt)
+			areanxt = p;
+		p->area = FREE;
+	}
+}
+
+void
+freearea(a)
+register int a;
+{
+	register struct region *p, *top;
+
+	top = areatop;
+	for (p = areabot; p != top; p = p->next)
+		if (p->area >= a)
+			p->area = FREE;
+}
+
+void
+setarea(cp,a)
+char *cp;
+int a;
+{
+	register struct region *p;
+
+	if ((p = (struct region *)cp) != NULL)
+		(p-1)->area = a;
+}
+
+int
+getarea(cp)
+char *cp;
+{
+	return ((struct region*)cp-1)->area;
+}
+
+void
+garbage()
+{
+	register struct region *p, *q, *top;
+
+	top = areatop;
+	for (p = areabot; p != top; p = p->next) {
+		if (p->area > areanum) {
+			while ((q = p->next)->area > areanum)
+				p->next = q->next;
+			areanxt = p;
+		}
+	}
+#ifdef SHRINKBY
+	if (areatop >= q + SHRINKBY && q->area > areanum) {
+		brk((char *)(q+1));
+		q->next = areabot;
+		q->area = BUSY;
+		areatop = q;
+	}
+#endif
+}

study/linux-travel/MINIX-1.5/1.5/Source/commands/sh/sh2.c

@@ -0,0 +1,782 @@
+#define Extern extern
+#include <sys/types.h>
+#include <signal.h>
+#include <errno.h>
+#include <setjmp.h>
+#include "sh.h"
+
+/* -------- csyn.c -------- */
+/*
+ * shell: syntax (C version)
+ */
+
+typedef union {
+	char	*cp;
+	char	**wp;
+	int	i;
+	struct	op *o;
+} YYSTYPE;
+#define	WORD	256
+#define	LOGAND	257
+#define	LOGOR	258
+#define	BREAK	259
+#define	IF	260
+#define	THEN	261
+#define	ELSE	262
+#define	ELIF	263
+#define	FI	264
+#define	CASE	265
+#define	ESAC	266
+#define	FOR	267
+#define	WHILE	268
+#define	UNTIL	269
+#define	DO	270
+#define	DONE	271
+#define	IN	272
+#define	YYERRCODE 300
+
+/* flags to yylex */
+#define	CONTIN	01	/* skip new lines to complete command */
+
+/* #include "sh.h" */
+#define	SYNTAXERR	zzerr()
+static	int	startl;
+static	int	peeksym;
+static	void	zzerr();
+static	void	word();
+static	char	**copyw();
+static	struct	op *block(), *namelist(), *list(), *newtp();
+static	struct	op *pipeline(), *andor(), *command();
+static	struct	op *nested(), *simple(), *c_list();
+static	struct	op *dogroup(), *thenpart(), *casepart(), *caselist();
+static	struct	op *elsepart();
+static	char	**wordlist(), **pattern();
+static	void	musthave();
+static	int	yylex();
+static	struct ioword *io();
+static	struct ioword **copyio();
+static	char	*tree();
+static	void	diag();
+static	int	nlseen;
+static	int	iounit = IODEFAULT;
+static	struct	op	*tp;
+struct	op	*newtp();
+
+static	YYSTYPE	yylval;
+
+int
+yyparse()
+{
+	startl  = 1;
+	peeksym = 0;
+	yynerrs = 0;
+	outtree = c_list();
+	musthave('\n', 0);
+	return(yynerrs!=0);
+}
+
+static struct op *
+pipeline(cf)
+int cf;
+{
+	register struct op *t, *p;
+	register int c;
+
+	t = command(cf);
+	if (t != NULL) {
+		while ((c = yylex(0)) == '|') {
+			if ((p = command(CONTIN)) == NULL)
+				SYNTAXERR;
+			if (t->type != TPAREN && t->type != TCOM) {
+				/* shell statement */
+				t = block(TPAREN, t, NOBLOCK, NOWORDS);
+			}
+			t = block(TPIPE, t, p, NOWORDS);
+		}
+		peeksym = c;
+	}
+	return(t);
+}
+
+static struct op *
+andor()
+{
+	register struct op *t, *p;
+	register int c;
+
+	t = pipeline(0);
+	if (t != NULL) {
+		while ((c = yylex(0)) == LOGAND || c == LOGOR) {
+			if ((p = pipeline(CONTIN)) == NULL)
+				SYNTAXERR;
+			t = block(c == LOGAND? TAND: TOR, t, p, NOWORDS);
+		}
+		peeksym = c;
+	}
+	return(t);
+}
+
+static struct op *
+c_list()
+{
+	register struct op *t, *p;
+	register int c;
+
+	t = andor();
+	if (t != NULL) {
+		if((peeksym = yylex(0)) == '&')
+			t = block(TASYNC, t, NOBLOCK, NOWORDS);
+		while ((c = yylex(0)) == ';' || c == '&' || multiline && c == '\n') {
+			if ((p = andor()) == NULL)
+				return(t);
+			if((peeksym = yylex(0)) == '&')
+				p = block(TASYNC, p, NOBLOCK, NOWORDS);
+			t = list(t, p);
+		}
+		peeksym = c;
+	}
+	return(t);
+}
+
+
+static int
+synio(cf)
+int cf;
+{
+	register struct ioword *iop;
+	register int i;
+	register int c;
+
+	if ((c = yylex(cf)) != '<' && c != '>') {
+		peeksym = c;
+		return(0);
+	}
+	i = yylval.i;
+	musthave(WORD, 0);
+	iop = io(iounit, i, yylval.cp);
+	iounit = IODEFAULT;
+	if (i & IOHERE)
+		markhere(yylval.cp, iop);
+	return(1);
+}
+
+static void
+musthave(c, cf)
+int c, cf;
+{
+	if ((peeksym = yylex(cf)) != c)
+		SYNTAXERR;
+	peeksym = 0;
+}
+
+static struct op *
+simple()
+{
+	register struct op *t;
+
+	t = NULL;
+	for (;;) {
+		switch (peeksym = yylex(0)) {
+		case '<':
+		case '>':
+			(void) synio(0);
+			break;
+
+		case WORD:
+			if (t == NULL) {
+				t = newtp();
+				t->type = TCOM;
+			}
+			peeksym = 0;
+			word(yylval.cp);
+			break;
+
+		default:
+			return(t);
+		}
+	}
+}
+
+static struct op *
+nested(type, mark)
+int type, mark;
+{
+	register struct op *t;
+
+	multiline++;
+	t = c_list();
+	musthave(mark, 0);
+	multiline--;
+	return(block(type, t, NOBLOCK, NOWORDS));
+}
+
+static struct op *
+command(cf)
+int cf;
+{
+	register struct ioword *io;
+	register struct op *t;
+	struct wdblock *iosave;
+	register int c;
+
+	iosave = iolist;
+	iolist = NULL;
+	if (multiline)
+		cf |= CONTIN;
+	while (synio(cf))
+		cf = 0;
+	switch (c = yylex(cf)) {
+	default:
+		peeksym = c;
+		if ((t = simple()) == NULL) {
+			if (iolist == NULL)
+				return((struct op *)NULL);
+			t = newtp();
+			t->type = TCOM;
+		}
+		break;
+
+	case '(':
+		t = nested(TPAREN, ')');
+		break;
+
+	case '{':
+		t = nested(TBRACE, '}');
+		break;
+
+	case FOR:
+		t = newtp();
+		t->type = TFOR;
+		musthave(WORD, 0);
+		startl = 1;
+		t->str = yylval.cp;
+		multiline++;
+		t->words = wordlist();
+		if ((c = yylex(0)) != '\n' && c != ';')
+			SYNTAXERR;
+		t->left = dogroup(0);
+		multiline--;
+		break;
+
+	case WHILE:
+	case UNTIL:
+		multiline++;
+		t = newtp();
+		t->type = c == WHILE? TWHILE: TUNTIL;
+		t->left = c_list();
+		t->right = dogroup(1);
+		t->words = NULL;
+		multiline--;
+		break;
+
+	case CASE:
+		t = newtp();
+		t->type = TCASE;
+		musthave(WORD, 0);
+		t->str = yylval.cp;
+		startl++;
+		multiline++;
+		musthave(IN, CONTIN);
+		startl++;
+		t->left = caselist();
+		musthave(ESAC, 0);
+		multiline--;
+		break;
+
+	case IF:
+		multiline++;
+		t = newtp();
+		t->type = TIF;
+		t->left = c_list();
+		t->right = thenpart();
+		musthave(FI, 0);
+		multiline--;
+		break;
+	}
+	while (synio(0))
+		;
+	t = namelist(t);
+	iolist = iosave;
+	return(t);
+}
+
+static struct op *
+dogroup(onlydone)
+int onlydone;
+{
+	register int c;
+	register struct op *list;
+
+	c = yylex(CONTIN);
+	if (c == DONE && onlydone)
+		return((struct op *)NULL);
+	if (c != DO)
+		SYNTAXERR;
+	list = c_list();
+	musthave(DONE, 0);
+	return(list);
+}
+
+static struct op *
+thenpart()
+{
+	register int c;
+	register struct op *t;
+
+	if ((c = yylex(0)) != THEN) {
+		peeksym = c;
+		return((struct op *)NULL);
+	}
+	t = newtp();
+	t->type = 0;
+	t->left = c_list();
+	if (t->left == NULL)
+		SYNTAXERR;
+	t->right = elsepart();
+	return(t);
+}
+
+static struct op *
+elsepart()
+{
+	register int c;
+	register struct op *t;
+
+	switch (c = yylex(0)) {
+	case ELSE:
+		if ((t = c_list()) == NULL)
+			SYNTAXERR;
+		return(t);
+
+	case ELIF:
+		t = newtp();
+		t->type = TELIF;
+		t->left = c_list();
+		t->right = thenpart();
+		return(t);
+
+	default:
+		peeksym = c;
+		return((struct op *)NULL);
+	}
+}
+
+static struct op *
+caselist()
+{
+	register struct op *t;
+	register int c;
+
+	t = NULL;
+	while ((peeksym = yylex(CONTIN)) != ESAC)
+		t = list(t, casepart());
+	return(t);
+}
+
+static struct op *
+casepart()
+{
+	register struct op *t;
+	register int c;
+
+	t = newtp();
+	t->type = TPAT;
+	t->words = pattern();
+	musthave(')', 0);
+	t->left = c_list();
+	if ((peeksym = yylex(CONTIN)) != ESAC)
+		musthave(BREAK, CONTIN);
+	return(t);
+}
+
+static char **
+pattern()
+{
+	register int c, cf;
+
+	cf = CONTIN;
+	do {
+		musthave(WORD, cf);
+		word(yylval.cp);
+		cf = 0;
+	} while ((c = yylex(0)) == '|');
+	peeksym = c;
+	word(NOWORD);
+	return(copyw());
+}
+
+static char **
+wordlist()
+{
+	register int c;
+
+	if ((c = yylex(0)) != IN) {
+		peeksym = c;
+		return((char **)NULL);
+	}
+	startl = 0;
+	while ((c = yylex(0)) == WORD)
+		word(yylval.cp);
+	word(NOWORD);
+	peeksym = c;
+	return(copyw());
+}
+
+/*
+ * supporting functions
+ */
+static struct op *
+list(t1, t2)
+register struct op *t1, *t2;
+{
+	if (t1 == NULL)
+		return(t2);
+	if (t2 == NULL)
+		return(t1);
+	return(block(TLIST, t1, t2, NOWORDS));
+}
+
+static struct op *
+block(type, t1, t2, wp)
+struct op *t1, *t2;
+char **wp;
+{
+	register struct op *t;
+
+	t = newtp();
+	t->type = type;
+	t->left = t1;
+	t->right = t2;
+	t->words = wp;
+	return(t);
+}
+
+struct res {
+	char	*r_name;
+	int	r_val;
+} restab[] = {
+	"for",		FOR,
+	"case",		CASE,
+	"esac",		ESAC,
+	"while",	WHILE,
+	"do",		DO,
+	"done",		DONE,
+	"if",		IF,
+	"in",		IN,
+	"then",		THEN,
+	"else",		ELSE,
+	"elif",		ELIF,
+	"until",	UNTIL,
+	"fi",		FI,
+
+	";;",		BREAK,
+	"||",		LOGOR,
+	"&&",		LOGAND,
+	"{",		'{',
+	"}",		'}',
+
+	0,
+};
+
+rlookup(n)
+register char *n;
+{
+	register struct res *rp;
+
+	for (rp = restab; rp->r_name; rp++)
+		if (strcmp(rp->r_name, n) == 0)
+			return(rp->r_val);
+	return(0);
+}
+
+static struct op *
+newtp()
+{
+	register struct op *t;
+
+	t = (struct op *)tree(sizeof(*t));
+	t->type = 0;
+	t->words = NULL;
+	t->ioact = NULL;
+	t->left = NULL;
+	t->right = NULL;
+	t->str = NULL;
+	return(t);
+}
+
+static struct op *
+namelist(t)
+register struct op *t;
+{
+	if (iolist) {
+		iolist = addword((char *)NULL, iolist);
+		t->ioact = copyio();
+	} else
+		t->ioact = NULL;
+	if (t->type != TCOM) {
+		if (t->type != TPAREN && t->ioact != NULL) {
+			t = block(TPAREN, t, NOBLOCK, NOWORDS);
+			t->ioact = t->left->ioact;
+			t->left->ioact = NULL;
+		}
+		return(t);
+	}
+	word(NOWORD);
+	t->words = copyw();
+	return(t);
+}
+
+static char **
+copyw()
+{
+	register char **wd;
+
+	wd = getwords(wdlist);
+	wdlist = 0;
+	return(wd);
+}
+
+static void
+word(cp)
+char *cp;
+{
+	wdlist = addword(cp, wdlist);
+}
+
+static struct ioword **
+copyio()
+{
+	register struct ioword **iop;
+
+	iop = (struct ioword **) getwords(iolist);
+	iolist = 0;
+	return(iop);
+}
+
+static struct ioword *
+io(u, f, cp)
+char *cp;
+{
+	register struct ioword *iop;
+
+	iop = (struct ioword *) tree(sizeof(*iop));
+	iop->io_unit = u;
+	iop->io_flag = f;
+	iop->io_name = cp;
+	iolist = addword((char *)iop, iolist);
+	return(iop);
+}
+
+static void
+zzerr()
+{
+	yyerror("syntax error");
+}
+
+yyerror(s)
+char *s;
+{
+	yynerrs++;
+	if (talking && e.iop <= iostack) {
+		multiline = 0;
+		while (eofc() == 0 && yylex(0) != '\n')
+			;
+	}
+	err(s);
+	fail();
+}
+
+static int
+yylex(cf)
+int cf;
+{
+	register int c, c1;
+	int atstart;
+
+	if ((c = peeksym) > 0) {
+		peeksym = 0;
+		if (c == '\n')
+			startl = 1;
+		return(c);
+	}
+	nlseen = 0;
+	e.linep = line;
+	atstart = startl;
+	startl = 0;
+	yylval.i = 0;
+
+loop:
+	while ((c = getc(0)) == ' ' || c == '\t')
+		;
+	switch (c) {
+	default:
+		if (any(c, "0123456789")) {
+			unget(c1 = getc(0));
+			if (c1 == '<' || c1 == '>') {
+				iounit = c - '0';
+				goto loop;
+			}
+			*e.linep++ = c;
+			c = c1;
+		}
+		break;
+
+	case '#':
+		while ((c = getc(0)) != 0 && c != '\n')
+			;
+		unget(c);
+		goto loop;
+
+	case 0:
+		return(c);
+
+	case '$':
+		*e.linep++ = c;
+		if ((c = getc(0)) == '{') {
+			if ((c = collect(c, '}')) != '\0')
+				return(c);
+			goto pack;
+		}
+		break;
+
+	case '`':
+	case '\'':
+	case '"':
+		if ((c = collect(c, c)) != '\0')
+			return(c);
+		goto pack;
+
+	case '|':
+	case '&':
+	case ';':
+		if ((c1 = dual(c)) != '\0') {
+			startl = 1;
+			return(c1);
+		}
+		startl = 1;
+		return(c);
+	case '^':
+		startl = 1;
+		return('|');
+	case '>':
+	case '<':
+		diag(c);
+		return(c);
+
+	case '\n':
+		nlseen++;
+		gethere();
+		startl = 1;
+		if (multiline || cf & CONTIN) {
+			if (talking && e.iop <= iostack)
+				prs(cprompt->value);
+			if (cf & CONTIN)
+				goto loop;
+		}
+		return(c);
+
+	case '(':
+	case ')':
+		startl = 1;
+		return(c);
+	}
+
+	unget(c);
+
+pack:
+	while ((c = getc(0)) != 0 && !any(c, "`$ '\"\t;&<>()|^\n"))
+		if (e.linep >= elinep)
+			err("word too long");
+		else
+			*e.linep++ = c;
+	unget(c);
+	if(any(c, "\"'`$"))
+		goto loop;
+	*e.linep++ = '\0';
+	if (atstart && (c = rlookup(line))!=0) {
+		startl = 1;
+		return(c);
+	}
+	yylval.cp = strsave(line, areanum);
+	return(WORD);
+}
+
+int
+collect(c, c1)
+register c, c1;
+{
+	char s[2];
+
+	*e.linep++ = c;
+	while ((c = getc(c1)) != c1) {
+		if (c == 0) {
+			unget(c);
+			s[0] = c1;
+			s[1] = 0;
+			prs("no closing "); yyerror(s);
+			return(YYERRCODE);
+		}
+		if (talking && c == '\n' && e.iop <= iostack)
+			prs(cprompt->value);
+		*e.linep++ = c;
+	}
+	*e.linep++ = c;
+	return(0);
+}
+
+int
+dual(c)
+register c;
+{
+	char s[3];
+	register char *cp = s;
+
+	*cp++ = c;
+	*cp++ = getc(0);
+	*cp = 0;
+	if ((c = rlookup(s)) == 0)
+		unget(*--cp);
+	return(c);
+}
+
+static void
+diag(ec)
+register int ec;
+{
+	register int c;
+
+	c = getc(0);
+	if (c == '>' || c == '<') {
+		if (c != ec)
+			zzerr();
+		yylval.i = ec == '>'? IOWRITE|IOCAT: IOHERE;
+		c = getc(0);
+	} else
+		yylval.i = ec == '>'? IOWRITE: IOREAD;
+	if (c != '&' || yylval.i == IOHERE)
+		unget(c);
+	else
+		yylval.i |= IODUP;
+}
+
+static char *
+tree(size)
+unsigned size;
+{
+	register char *t;
+
+	if ((t = getcell(size)) == NULL) {
+		prs("command line too complicated\n");
+		fail();
+		/* NOTREACHED */
+	}
+	return(t);
+}
+
+/* VARARGS1 */
+/* ARGSUSED */
+printf(s)	/* yyparse calls it */
+char *s;
+{
+}
+

study/linux-travel/MINIX-1.5/1.5/Source/commands/sh/sh4.c

@@ -0,0 +1,753 @@
+#define Extern extern
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/dir.h>
+#include <limits.h>
+#include <signal.h>
+#include <errno.h>
+#include <setjmp.h>
+#include "sh.h"
+
+/* -------- eval.c -------- */
+/* #include "sh.h" */
+/* #include "word.h" */
+
+/*
+ * ${}
+ * `command`
+ * blank interpretation
+ * quoting
+ * glob
+ */
+
+static	char	*blank();
+static	int	grave();
+static	int	expand();
+static	int	dollar();
+
+char **
+eval(ap, f)
+register char **ap;
+{
+	struct wdblock *wb;
+	char **wp;
+	char **wf;
+	jmp_buf ev;
+
+	wp = NULL;
+	wb = NULL;
+	wf = NULL;
+	if (newenv(setjmp(errpt = ev)) == 0) {
+		while (*ap && isassign(*ap))
+			expand(*ap++, &wb, f & ~DOGLOB);
+		if (flag['k']) {
+			for (wf = ap; *wf; wf++) {
+				if (isassign(*wf))
+					expand(*wf, &wb, f & ~DOGLOB);
+			}
+		}
+		for (wb = addword((char *)0, wb); *ap; ap++) {
+			if (!flag['k'] || !isassign(*ap))
+				expand(*ap, &wb, f & ~DOKEY);
+		}
+		wb = addword((char *)0, wb);
+		wp = getwords(wb);
+		quitenv();
+	} else
+		gflg = 1;
+	return(gflg? (char **)NULL: wp);
+}
+
+/*
+ * Make the exported environment from the exported
+ * names in the dictionary. Keyword assignments
+ * will already have been done.
+ */
+char **
+makenv()
+
+{
+	register struct wdblock *wb;
+	register struct var *vp;
+
+	wb = NULL;
+	for (vp = vlist; vp; vp = vp->next)
+		if (vp->status & EXPORT)
+			wb = addword(vp->name, wb);
+	wb = addword((char *)0, wb);
+	return(getwords(wb));
+}
+
+char *
+evalstr(cp, f)
+register char *cp;
+int f;
+{
+	struct wdblock *wb;
+
+	wb = NULL;
+	if (expand(cp, &wb, f)) {
+		if (wb == NULL || wb->w_nword == 0 || (cp = wb->w_words[0]) == NULL)
+			cp = "";
+		DELETE(wb);
+	} else
+		cp = NULL;
+	return(cp);
+}
+
+static int
+expand(cp, wbp, f)
+register char *cp;
+register struct wdblock **wbp;
+{
+	jmp_buf ev;
+
+	gflg = 0;
+	if (cp == NULL)
+		return(0);
+	if (!anys("$`'\"", cp) &&
+	    !anys(ifs->value, cp) &&
+	    ((f&DOGLOB)==0 || !anys("[*?", cp))) {
+		cp = strsave(cp, areanum);
+		if (f & DOTRIM)
+			unquote(cp);
+		*wbp = addword(cp, *wbp);
+		return(1);
+	}
+	if (newenv(setjmp(errpt = ev)) == 0) {
+		PUSHIO(aword, cp, strchar);
+		e.iobase = e.iop;
+		while ((cp = blank(f)) && gflg == 0) {
+			e.linep = cp;
+			cp = strsave(cp, areanum);
+			if ((f&DOGLOB) == 0) {
+				if (f & DOTRIM)
+					unquote(cp);
+				*wbp = addword(cp, *wbp);
+			} else
+				*wbp = glob(cp, *wbp);
+		}
+		quitenv();
+	} else
+		gflg = 1;
+	return(gflg == 0);
+}
+
+/*
+ * Blank interpretation and quoting
+ */
+static char *
+blank(f)
+{
+	register c, c1;
+	register char *sp;
+	int scanequals, foundequals;
+
+	sp = e.linep;
+	scanequals = f & DOKEY;
+	foundequals = 0;
+
+loop:
+	switch (c = subgetc('"', foundequals)) {
+	case 0:
+		if (sp == e.linep)
+			return(0);
+		*e.linep++ = 0;
+		return(sp);
+
+	default:
+		if (f & DOBLANK && any(c, ifs->value))
+			goto loop;
+		break;
+
+	case '"':
+	case '\'':
+		scanequals = 0;
+		if (INSUB())
+			break;
+		for (c1 = c; (c = subgetc(c1, 1)) != c1;) {
+			if (c == 0)
+				break;
+			if (c == '\'' || !any(c, "$`\""))
+				c |= QUOTE;
+			*e.linep++ = c;
+		}
+		c = 0;
+	}
+	unget(c);
+	if (!letter(c))
+		scanequals = 0;
+	for (;;) {
+		c = subgetc('"', foundequals);
+		if (c == 0 ||
+		    f & DOBLANK && any(c, ifs->value) ||
+		    !INSUB() && any(c, "\"'")) {
+		        scanequals = 0;
+			unget(c);
+			if (any(c, "\"'"))
+				goto loop;
+			break;
+		}
+		if (scanequals)
+			if (c == '=') {
+				foundequals = 1;
+				scanequals  = 0;
+			}
+			else if (!letnum(c))
+				scanequals = 0;
+		*e.linep++ = c;
+	}
+	*e.linep++ = 0;
+	return(sp);
+}
+
+/*
+ * Get characters, substituting for ` and $
+ */
+int
+subgetc(ec, quoted)
+register char ec;
+int quoted;
+{
+	register char c;
+
+again:
+	c = getc(ec);
+	if (!INSUB() && ec != '\'') {
+		if (c == '`') {
+			if (grave(quoted) == 0)
+				return(0);
+			e.iop->task = XGRAVE;
+			goto again;
+		}
+		if (c == '$' && (c = dollar(quoted)) == 0) {
+			e.iop->task = XDOLL;
+			goto again;
+		}
+	}
+	return(c);
+}
+
+/*
+ * Prepare to generate the string returned by ${} substitution.
+ */
+static int
+dollar(quoted)
+int quoted;
+{
+	int otask;
+	struct io *oiop;
+	char *dolp;
+	register char *s, c, *cp;
+	struct var *vp;
+
+	c = readc();
+	s = e.linep;
+	if (c != '{') {
+		*e.linep++ = c;
+		if (letter(c)) {
+			while ((c = readc())!=0 && letnum(c))
+				if (e.linep < elinep)
+					*e.linep++ = c;
+			unget(c);
+		}
+		c = 0;
+	} else {
+		oiop = e.iop;
+		otask = e.iop->task;
+		e.iop->task = XOTHER;
+		while ((c = subgetc('"', 0))!=0 && c!='}' && c!='\n')
+			if (e.linep < elinep)
+				*e.linep++ = c;
+		if (oiop == e.iop)
+			e.iop->task = otask;
+		if (c != '}') {
+			err("unclosed ${");
+			gflg++;
+			return(c);
+		}
+	}
+	if (e.linep >= elinep) {
+		err("string in ${} too long");
+		gflg++;
+		e.linep -= 10;
+	}
+	*e.linep = 0;
+	if (*s)
+		for (cp = s+1; *cp; cp++)
+			if (any(*cp, "=-+?")) {
+				c = *cp;
+				*cp++ = 0;
+				break;
+			}
+	if (s[1] == 0 && (*s == '*' || *s == '@')) {
+		if (dolc > 1) {
+			/* currently this does not distinguish $* and $@ */
+			/* should check dollar */
+			e.linep = s;
+			PUSHIO(awordlist, dolv+1, dolchar);
+			return(0);
+		} else {	/* trap the nasty ${=} */
+			s[0] = '1';
+			s[1] = 0;
+		}
+	}
+	vp = lookup(s);
+	if ((dolp = vp->value) == null) {
+		switch (c) {
+		case '=':
+			if (digit(*s)) {
+				err("cannot use ${...=...} with $n");
+				gflg++;
+				break;
+			}
+			setval(vp, cp);
+			dolp = vp->value;
+			break;
+
+		case '-':
+			dolp = strsave(cp, areanum);
+			break;
+
+		case '?':
+			if (*cp == 0) {
+				prs("missing value for ");
+				err(s);
+			} else
+				err(cp);
+			gflg++;
+			break;
+		}
+	} else if (c == '+')
+		dolp = strsave(cp, areanum);
+	if (flag['u'] && dolp == null) {
+		prs("unset variable: ");
+		err(s);
+		gflg++;
+	}
+	e.linep = s;
+	PUSHIO(aword, dolp, quoted ? qstrchar : strchar);
+	return(0);
+}
+
+/*
+ * Run the command in `...` and read its output.
+ */
+static int
+grave(quoted)
+int quoted;
+{
+	register char *cp;
+	register int i;
+	int pf[2];
+
+	for (cp = e.iop->argp->aword; *cp != '`'; cp++)
+		if (*cp == 0) {
+			err("no closing `");
+			return(0);
+		}
+	if (openpipe(pf) < 0)
+		return(0);
+	if ((i = fork()) == -1) {
+		closepipe(pf);
+		err("try again");
+		return(0);
+	}
+	if (i != 0) {
+		e.iop->argp->aword = ++cp;
+		close(pf[1]);
+		PUSHIO(afile, remap(pf[0]), quoted? qgravechar: gravechar);
+		return(1);
+	}
+	*cp = 0;
+	/* allow trapped signals */
+	for (i=0; i<=_NSIG; i++)
+		if (ourtrap[i] && signal(i, SIG_IGN) != SIG_IGN)
+			signal(i, SIG_DFL);
+	dup2(pf[1], 1);
+	closepipe(pf);
+	flag['e'] = 0;
+	flag['v'] = 0;
+	flag['n'] = 0;
+	cp = strsave(e.iop->argp->aword, 0);
+	areanum = 1;
+	freehere(areanum);
+	freearea(areanum);	/* free old space */
+	e.oenv = NULL;
+	e.iop = (e.iobase = iostack) - 1;
+	unquote(cp);
+	talking = 0;
+	PUSHIO(aword, cp, nlchar);
+	onecommand();
+	exit(1);
+}
+
+char *
+unquote(as)
+register char *as;
+{
+	register char *s;
+
+	if ((s = as) != NULL)
+		while (*s)
+			*s++ &= ~QUOTE;
+	return(as);
+}
+
+/* -------- glob.c -------- */
+/* #include "sh.h" */
+
+/*
+ * glob
+ */
+
+#define	scopy(x) strsave((x), areanum)
+#define	BLKSIZ	512
+#define	NDENT	((BLKSIZ+sizeof(struct direct)-1)/sizeof(struct direct))
+
+static	struct wdblock	*cl, *nl;
+static	char	spcl[] = "[?*";
+static	int	xstrcmp();
+static	char	*generate();
+static	int	anyspcl();
+
+struct wdblock *
+glob(cp, wb)
+char *cp;
+struct wdblock *wb;
+{
+	register i;
+	register char *pp;
+
+	if (cp == 0)
+		return(wb);
+	i = 0;
+	for (pp = cp; *pp; pp++)
+		if (any(*pp, spcl))
+			i++;
+		else if (!any(*pp & ~QUOTE, spcl))
+			*pp &= ~QUOTE;
+	if (i != 0) {
+		for (cl = addword(scopy(cp), (struct wdblock *)0); anyspcl(cl); cl = nl) {
+			nl = newword(cl->w_nword*2);
+			for(i=0; i<cl->w_nword; i++) { /* for each argument */
+				for (pp = cl->w_words[i]; *pp; pp++)
+					if (any(*pp, spcl)) {
+						globname(cl->w_words[i], pp);
+						break;
+					}
+				if (*pp == '\0')
+					nl = addword(scopy(cl->w_words[i]), nl);
+			}
+			for(i=0; i<cl->w_nword; i++)
+				DELETE(cl->w_words[i]);
+			DELETE(cl);
+		}
+		for(i=0; i<cl->w_nword; i++)
+			unquote(cl->w_words[i]);
+		glob0((char *)cl->w_words, cl->w_nword, sizeof(char *), xstrcmp);
+		if (cl->w_nword) {
+			for (i=0; i<cl->w_nword; i++)
+				wb = addword(cl->w_words[i], wb);
+			DELETE(cl);
+			return(wb);
+		}
+	}
+	wb = addword(unquote(cp), wb);
+	return(wb);
+}
+
+globname(we, pp)
+char *we;
+register char *pp;
+{
+	register char *np, *cp;
+	char *name, *gp, *dp;
+	int dn, j, n, k;
+	struct direct ent[NDENT];
+	char dname[NAME_MAX+1];
+	struct stat dbuf;
+
+	for (np = we; np != pp; pp--)
+		if (pp[-1] == '/')
+			break;
+	for (dp = cp = space((int)(pp-np)+3); np < pp;)
+		*cp++ = *np++;
+	*cp++ = '.';
+	*cp = '\0';
+	for (gp = cp = space(strlen(pp)+1); *np && *np != '/';)
+		*cp++ = *np++;
+	*cp = '\0';
+	dn = open(dp, 0);
+	if (dn < 0) {
+		DELETE(dp);
+		DELETE(gp);
+		return;
+	}
+	dname[NAME_MAX] = '\0';
+	while ((n = read(dn, (char *)ent, sizeof(ent))) >= sizeof(*ent)) {
+		n /= sizeof(*ent);
+		for (j=0; j<n; j++) {
+			if (ent[j].d_ino == 0)
+				continue;
+			strncpy(dname, ent[j].d_name, NAME_MAX);
+			if (dname[0] == '.')
+				if (*gp != '.')
+					continue;
+			for(k=0; k<NAME_MAX; k++)
+				if (any(dname[k], spcl))
+					dname[k] |= QUOTE;
+			if (gmatch(dname, gp)) {
+				name = generate(we, pp, dname, np);
+				if (*np && !anys(np, spcl)) {
+					if (stat(name,&dbuf)) {
+						DELETE(name);
+						continue;
+					}
+				}
+				nl = addword(name, nl);
+			}
+		}
+	}
+	close(dn);
+	DELETE(dp);
+	DELETE(gp);
+}
+
+/*
+ * generate a pathname as below.
+ * start..end1 / middle end
+ * the slashes come for free
+ */
+static char *
+generate(start1, end1, middle, end)
+char *start1;
+register char *end1;
+char *middle, *end;
+{
+	char *p;
+	register char *op, *xp;
+
+	p = op = space((int)(end1-start1)+strlen(middle)+strlen(end)+2);
+	for (xp = start1; xp != end1;)
+		*op++ = *xp++;
+	for (xp = middle; (*op++ = *xp++) != '\0';)
+		;
+	op--;
+	for (xp = end; (*op++ = *xp++) != '\0';)
+		;
+	return(p);
+}
+
+static int
+anyspcl(wb)
+register struct wdblock *wb;
+{
+	register i;
+	register char **wd;
+
+	wd = wb->w_words;
+	for (i=0; i<wb->w_nword; i++)
+		if (anys(spcl, *wd++))
+			return(1);
+	return(0);
+}
+
+static int
+xstrcmp(p1, p2)
+char *p1, *p2;
+{
+	return(strcmp(*(char **)p1, *(char **)p2));
+}
+
+/* -------- word.c -------- */
+/* #include "sh.h" */
+/* #include "word.h" */
+char *memcpy();
+
+#define	NSTART	16	/* default number of words to allow for initially */
+
+struct wdblock *
+newword(nw)
+register nw;
+{
+	register struct wdblock *wb;
+
+	wb = (struct wdblock *) space(sizeof(*wb) + nw*sizeof(char *));
+	wb->w_bsize = nw;
+	wb->w_nword = 0;
+	return(wb);
+}
+
+struct wdblock *
+addword(wd, wb)
+char *wd;
+register struct wdblock *wb;
+{
+	register struct wdblock *wb2;
+	register nw;
+
+	if (wb == NULL)
+		wb = newword(NSTART);
+	if ((nw = wb->w_nword) >= wb->w_bsize) {
+		wb2 = newword(nw * 2);
+		memcpy((char *)wb2->w_words, (char *)wb->w_words, nw*sizeof(char *));
+		wb2->w_nword = nw;
+		DELETE(wb);
+		wb = wb2;
+	}
+	wb->w_words[wb->w_nword++] = wd;
+	return(wb);
+}
+
+char **
+getwords(wb)
+register struct wdblock *wb;
+{
+	register char **wd;
+	register nb;
+
+	if (wb == NULL)
+		return((char **)NULL);
+	if (wb->w_nword == 0) {
+		DELETE(wb);
+		return((char **)NULL);
+	}
+	wd = (char **) space(nb = sizeof(*wd) * wb->w_nword);
+	memcpy((char *)wd, (char *)wb->w_words, nb);
+	DELETE(wb);	/* perhaps should done by caller */
+	return(wd);
+}
+
+int	(*func)();
+int	globv;
+
+glob0(a0, a1, a2, a3)
+char *a0;
+unsigned a1;
+int a2;
+int (*a3)();
+{
+	func = a3;
+	globv = a2;
+	glob1(a0, a0 + a1 * a2);
+}
+
+glob1(base, lim)
+char *base, *lim;
+{
+	register char *i, *j;
+	int v2;
+	char **k;
+	char *lptr, *hptr;
+	int c;
+	unsigned n;
+
+
+	v2 = globv;
+
+top:
+	if ((n=(int)(lim-base)) <= v2)
+		return;
+	n = v2 * (n / (2*v2));
+	hptr = lptr = base+n;
+	i = base;
+	j = lim-v2;
+	for(;;) {
+		if (i < lptr) {
+			if ((c = (*func)(i, lptr)) == 0) {
+				glob2(i, lptr -= v2);
+				continue;
+			}
+			if (c < 0) {
+				i += v2;
+				continue;
+			}
+		}
+
+begin:
+		if (j > hptr) {
+			if ((c = (*func)(hptr, j)) == 0) {
+				glob2(hptr += v2, j);
+				goto begin;
+			}
+			if (c > 0) {
+				if (i == lptr) {
+					glob3(i, hptr += v2, j);
+					i = lptr += v2;
+					goto begin;
+				}
+				glob2(i, j);
+				j -= v2;
+				i += v2;
+				continue;
+			}
+			j -= v2;
+			goto begin;
+		}
+
+
+		if (i == lptr) {
+			if (lptr-base >= lim-hptr) {
+				glob1(hptr+v2, lim);
+				lim = lptr;
+			} else {
+				glob1(base, lptr);
+				base = hptr+v2;
+			}
+			goto top;
+		}
+
+
+		glob3(j, lptr -= v2, i);
+		j = hptr -= v2;
+	}
+}
+
+glob2(i, j)
+char *i, *j;
+{
+	register char *index1, *index2, c;
+	int m;
+
+	m = globv;
+	index1 = i;
+	index2 = j;
+	do {
+		c = *index1;
+		*index1++ = *index2;
+		*index2++ = c;
+	} while(--m);
+}
+
+glob3(i, j, k)
+char *i, *j, *k;
+{
+	register char *index1, *index2, *index3;
+	int c;
+	int m;
+
+	m = globv;
+	index1 = i;
+	index2 = j;
+	index3 = k;
+	do {
+		c = *index1;
+		*index1++ = *index3;
+		*index3++ = *index2;
+		*index2++ = c;
+	} while(--m);
+}
+
+char *
+memcpy(ato, from, nb)
+register char *ato, *from;
+register int nb;
+{
+	register char *to;
+
+	to = ato;
+	while (--nb >= 0)
+		*to++ = *from++;
+	return(ato);
+}

study/linux-travel/MINIX-1.5/1.5/Source/commands/sh/sh5.c

@@ -0,0 +1,665 @@
+#define Extern extern
+#include <sys/types.h>
+#include <signal.h>
+#include <errno.h>
+#include <setjmp.h>
+#include "sh.h"
+
+/* -------- io.c -------- */
+/* #include "sh.h" */
+
+/*
+ * shell IO
+ */
+
+static struct iobuf sharedbuf = {AFID_NOBUF};
+static struct iobuf mainbuf = {AFID_NOBUF};
+static unsigned bufid = AFID_ID;	/* buffer id counter */
+
+struct ioarg temparg = {0, 0, 0, AFID_NOBUF, 0};
+
+int
+getc(ec)
+register int ec;
+{
+	register int c;
+
+	if(e.linep > elinep) {
+		while((c=readc()) != '\n' && c)
+			;
+		err("input line too long");
+		gflg++;
+		return(c);
+	}
+	c = readc();
+ 	if (ec != '\'' && ec != '`' && e.iop->task != XGRAVE) {
+		if(c == '\\') {
+			c = readc();
+			if (c == '\n' && ec != '\"')
+				return(getc(ec));
+			c |= QUOTE;
+		}
+	}
+	return(c);
+}
+
+void
+unget(c)
+{
+	if (e.iop >= e.iobase)
+		e.iop->peekc = c;
+}
+
+int
+eofc()
+
+{
+  return e.iop < e.iobase || (e.iop->peekc == 0 && e.iop->prev == 0);
+}
+
+int
+readc()
+{
+	register c;
+
+	for (; e.iop >= e.iobase; e.iop--)
+		if ((c = e.iop->peekc) != '\0') {
+			e.iop->peekc = 0;
+			return(c);
+		}
+		else {
+		    if (e.iop->prev != 0) {
+		        if ((c = (*e.iop->iofn)(e.iop->argp, e.iop)) != '\0') {
+			        if (c == -1) {
+				        e.iop++;
+				        continue;
+			        }
+			        if (e.iop == iostack)
+				        ioecho(c);
+			        return(e.iop->prev = c);
+		        }
+		        else if (e.iop->task == XIO && e.iop->prev != '\n') {
+			        e.iop->prev = 0;
+				if (e.iop == iostack)
+					ioecho('\n');
+			        return '\n';
+		        }
+		    }
+		    if (e.iop->task == XIO) {
+			if (multiline)
+			    return e.iop->prev = 0;
+			if (talking && e.iop == iostack+1)
+			    prs(prompt->value);
+		    }
+		}
+	if (e.iop >= iostack)
+		return(0);
+	leave();
+	/* NOTREACHED */
+}
+
+void
+ioecho(c)
+char c;
+{
+	if (flag['v'])
+		write(2, &c, sizeof c);
+}
+
+void
+pushio(argp, fn)
+struct ioarg *argp;
+int (*fn)();
+{
+	if (++e.iop >= &iostack[NPUSH]) {
+		e.iop--;
+		err("Shell input nested too deeply");
+		gflg++;
+		return;
+	}
+	e.iop->iofn = fn;
+
+	if (argp->afid != AFID_NOBUF)
+	  e.iop->argp = argp;
+	else {
+	  e.iop->argp  = ioargstack + (e.iop - iostack);
+	  *e.iop->argp = *argp;
+	  e.iop->argp->afbuf = e.iop == &iostack[0] ? &mainbuf : &sharedbuf;
+	  if (isatty(e.iop->argp->afile) == 0 &&
+	      (e.iop == &iostack[0] ||
+	       lseek(e.iop->argp->afile, 0L, 1) != -1)) {
+	    if (++bufid == AFID_NOBUF)
+	      bufid = AFID_ID;
+	    e.iop->argp->afid  = bufid;
+	  }
+	}
+
+	e.iop->prev  = ~'\n';
+	e.iop->peekc = 0;
+	e.iop->xchar = 0;
+	e.iop->nlcount = 0;
+	if (fn == filechar || fn == linechar)
+		e.iop->task = XIO;
+	else if (fn == gravechar || fn == qgravechar)
+		e.iop->task = XGRAVE;
+	else
+		e.iop->task = XOTHER;
+}
+
+struct io *
+setbase(ip)
+struct io *ip;
+{
+	register struct io *xp;
+
+	xp = e.iobase;
+	e.iobase = ip;
+	return(xp);
+}
+
+/*
+ * Input generating functions
+ */
+
+/*
+ * Produce the characters of a string, then a newline, then EOF.
+ */
+int
+nlchar(ap)
+register struct ioarg *ap;
+{
+	register int c;
+
+	if (ap->aword == NULL)
+		return(0);
+	if ((c = *ap->aword++) == 0) {
+		ap->aword = NULL;
+		return('\n');
+	}
+	return(c);
+}
+
+/*
+ * Given a list of words, produce the characters
+ * in them, with a space after each word.
+ */
+int
+wdchar(ap)
+register struct ioarg *ap;
+{
+	register char c;
+	register char **wl;
+
+	if ((wl = ap->awordlist) == NULL)
+		return(0);
+	if (*wl != NULL) {
+		if ((c = *(*wl)++) != 0)
+			return(c & 0177);
+		ap->awordlist++;
+		return(' ');
+	}
+	ap->awordlist = NULL;
+	return('\n');
+}
+
+/*
+ * Return the characters of a list of words,
+ * producing a space between them.
+ */
+static	int	xxchar();
+
+int
+dolchar(ap)
+register struct ioarg *ap;
+{
+	register char *wp;
+
+	if ((wp = *ap->awordlist++) != NULL) {
+		PUSHIO(aword, wp, *ap->awordlist == NULL? strchar: xxchar);
+		return(-1);
+	}
+	return(0);
+}
+
+static int
+xxchar(ap)
+register struct ioarg *ap;
+{
+	register int c;
+
+	if (ap->aword == NULL)
+		return(0);
+	if ((c = *ap->aword++) == '\0') {
+		ap->aword = NULL;
+		return(' ');
+	}
+	return(c);
+}
+
+/*
+ * Produce the characters from a single word (string).
+ */
+int
+strchar(ap)
+register struct ioarg *ap;
+{
+	register int c;
+
+	if (ap->aword == NULL || (c = *ap->aword++) == 0)
+		return(0);
+	return(c);
+}
+
+/*
+ * Produce quoted characters from a single word (string).
+ */
+int
+qstrchar(ap)
+register struct ioarg *ap;
+{
+	register int c;
+
+	if (ap->aword == NULL || (c = *ap->aword++) == 0)
+		return(0);
+	return(c|QUOTE);
+}
+
+/*
+ * Return the characters from a file.
+ */
+int
+filechar(ap)
+register struct ioarg *ap;
+{
+	register int i;
+	char c;
+	struct iobuf *bp = ap->afbuf;
+	extern int errno;
+
+	if (ap->afid != AFID_NOBUF) {
+	  if ((i = ap->afid != bp->id) || bp->bufp == bp->ebufp) {
+	    if (i)
+	      lseek(ap->afile, ap->afpos, 0);
+	    do {
+	      i = read(ap->afile, bp->buf, sizeof(bp->buf));
+	    } while (i < 0 && errno == EINTR);
+	    if (i <= 0) {
+	      closef(ap->afile);
+	      return 0;
+	    }
+	    bp->id = ap->afid;
+	    bp->ebufp = (bp->bufp  = bp->buf) + i;
+	  }
+	  ap->afpos++;
+	  return *bp->bufp++ & 0177;
+	}
+
+	do {
+		i = read(ap->afile, &c, sizeof(c));
+	} while (i < 0 && errno == EINTR);
+	return(i == sizeof(c)? c&0177: (closef(ap->afile), 0));
+}
+
+/*
+ * Return the characters from a here temp file.
+ */
+int
+herechar(ap)
+register struct ioarg *ap;
+{
+	char c;
+
+
+	if (read(ap->afile, &c, sizeof(c)) != sizeof(c)) {
+		close(ap->afile);
+		c = 0;
+	}
+	return (c);
+
+}
+
+/*
+ * Return the characters produced by a process (`...`).
+ * Quote them if required, and remove any trailing newline characters.
+ */
+int
+gravechar(ap, iop)
+struct ioarg *ap;
+struct io *iop;
+{
+	register int c;
+
+	if ((c = qgravechar(ap, iop)&~QUOTE) == '\n')
+		c = ' ';
+	return(c);
+}
+
+int
+qgravechar(ap, iop)
+register struct ioarg *ap;
+struct io *iop;
+{
+	register int c;
+
+	if (iop->xchar) {
+		if (iop->nlcount) {
+			iop->nlcount--;
+			return('\n'|QUOTE);
+		}
+		c = iop->xchar;
+		iop->xchar = 0;
+	} else if ((c = filechar(ap)) == '\n') {
+		iop->nlcount = 1;
+		while ((c = filechar(ap)) == '\n')
+			iop->nlcount++;
+		iop->xchar = c;
+		if (c == 0)
+			return(c);
+		iop->nlcount--;
+		c = '\n';
+	}
+	return(c!=0? c|QUOTE: 0);
+}
+
+/*
+ * Return a single command (usually the first line) from a file.
+ */
+int
+linechar(ap)
+register struct ioarg *ap;
+{
+	register int c;
+
+	if ((c = filechar(ap)) == '\n') {
+		if (!multiline) {
+			closef(ap->afile);
+			ap->afile = -1;	/* illegal value */
+		}
+	}
+	return(c);
+}
+
+void
+prs(s)
+register char *s;
+{
+	if (*s)
+		write(2, s, strlen(s));
+}
+
+void
+putc(c)
+char c;
+{
+	write(2, &c, sizeof c);
+}
+
+void
+prn(u)
+unsigned u;
+{
+	prs(itoa(u, 0));
+}
+
+void
+closef(i)
+register i;
+{
+	if (i > 2)
+		close(i);
+}
+
+void
+closeall()
+{
+	register u;
+
+	for (u=NUFILE; u<NOFILE;)
+		close(u++);
+}
+
+/*
+ * remap fd into Shell's fd space
+ */
+int
+remap(fd)
+register int fd;
+{
+	register int i;
+	int map[NOFILE];
+
+	if (fd < e.iofd) {
+		for (i=0; i<NOFILE; i++)
+			map[i] = 0;
+		do {
+			map[fd] = 1;
+			fd = dup(fd);
+		} while (fd >= 0 && fd < e.iofd);
+		for (i=0; i<NOFILE; i++)
+			if (map[i])
+				close(i);
+		if (fd < 0)
+			err("too many files open in shell");
+	}
+	return(fd);
+}
+
+int
+openpipe(pv)
+register int *pv;
+{
+	register int i;
+
+	if ((i = pipe(pv)) < 0)
+		err("can't create pipe - try again");
+	return(i);
+}
+
+void
+closepipe(pv)
+register int *pv;
+{
+	if (pv != NULL) {
+		close(*pv++);
+		close(*pv);
+	}
+}
+
+/* -------- here.c -------- */
+/* #include "sh.h" */
+
+/*
+ * here documents
+ */
+
+struct	here {
+	char	*h_tag;
+	int	h_dosub;
+	struct	ioword *h_iop;
+	struct	here	*h_next;
+};
+
+static	struct here *inhere;		/* list of hear docs while parsing */
+static	struct here *acthere;		/* list of active here documents */
+
+static	void readhere();
+
+markhere(s, iop)
+register char *s;
+struct ioword *iop;
+{
+	register struct here *h, *lh;
+
+	h = (struct here *) space(sizeof(struct here));
+	if (h == 0)
+		return;
+	h->h_tag = evalstr(s, DOSUB);
+	if (h->h_tag == 0)
+		return;
+	h->h_iop = iop;
+	iop->io_name = 0;
+	h->h_next = NULL;
+	if (inhere == 0)
+		inhere = h;
+	else
+		for (lh = inhere; lh!=NULL; lh = lh->h_next)
+			if (lh->h_next == 0) {
+				lh->h_next = h;
+				break;
+			}
+	iop->io_flag |= IOHERE|IOXHERE;
+	for (s = h->h_tag; *s; s++)
+		if (*s & QUOTE) {
+			iop->io_flag &= ~ IOXHERE;
+			*s &= ~ QUOTE;
+		}
+	h->h_dosub = iop->io_flag & IOXHERE;
+}
+
+gethere()
+{
+	register struct here *h, *hp;
+
+	/* Scan here files first leaving inhere list in place */
+	for (hp = h = inhere; h != NULL; hp = h, h = h->h_next)
+	  readhere(&h->h_iop->io_name, h->h_tag, h->h_dosub? 0: '\'');
+
+	/* Make inhere list active - keep list intact for scraphere */
+	if (hp != NULL) {
+	  hp->h_next = acthere;
+	  acthere    = inhere;
+	  inhere     = NULL;
+	}
+}
+
+static void
+readhere(name, s, ec)
+char **name;
+register char *s;
+{
+	int tf;
+	char tname[30];
+	register c;
+	jmp_buf ev;
+	char line [LINELIM+1];
+	char *next;
+
+	tempname(tname);
+	*name = strsave(tname, areanum);
+	tf = creat(tname, 0600);
+	if (tf < 0)
+		return;
+	if (newenv(setjmp(errpt = ev)) != 0)
+		unlink(tname);
+	else {
+		pushio(e.iop->argp, e.iop->iofn);
+		e.iobase = e.iop;
+		for (;;) {
+			if (talking && e.iop <= iostack)
+				prs(cprompt->value);
+			next = line;
+			while ((c = getc(ec)) != '\n' && c) {
+				if (ec == '\'')
+					c &= ~ QUOTE;
+				if (next >= &line[LINELIM]) {
+					c = 0;
+					break;
+				}
+				*next++ = c;
+			}
+			*next = 0;
+			if (strcmp(s, line) == 0 || c == 0)
+				break;
+			*next++ = '\n';
+			write (tf, line, (int)(next-line));
+		}
+		if (c == 0) {
+			prs("here document `"); prs(s); err("' unclosed");
+		}
+		quitenv();
+	}
+	close(tf);
+}
+
+/*
+ * open here temp file.
+ * if unquoted here, expand here temp file into second temp file.
+ */
+herein(hname, xdoll)
+char *hname;
+{
+	register hf, tf;
+
+	if (hname == 0)
+		return(-1);
+	hf = open(hname, 0);
+	if (hf < 0)
+		return (-1);
+	if (xdoll) {
+		char c;
+		char tname[30];
+		jmp_buf ev;
+
+		tempname(tname);
+		if ((tf = creat(tname, 0600)) < 0)
+			return (-1);
+		if (newenv(setjmp(errpt = ev)) == 0) {
+			PUSHIO(afile, hf, herechar);
+			setbase(e.iop);
+			while ((c = subgetc(0, 0)) != 0) {
+				c &= ~ QUOTE;
+				write(tf, &c, sizeof c);
+			}
+			quitenv();
+		} else
+			unlink(tname);
+		close(tf);
+		tf = open(tname, 0);
+		unlink(tname);
+		return (tf);
+	} else
+		return (hf);
+}
+
+scraphere()
+{
+	register struct here *h;
+
+	for (h = inhere; h != NULL; h = h->h_next) {
+		if (h->h_iop && h->h_iop->io_name)
+		  unlink(h->h_iop->io_name);
+	}
+	inhere = NULL;
+}
+
+/* unlink here temp files before a freearea(area) */
+freehere(area)
+int area;
+{
+	register struct here *h, *hl;
+
+	hl = NULL;
+	for (h = acthere; h != NULL; h = h->h_next)
+		if (getarea(h) >= area) {
+			if (h->h_iop->io_name != NULL)
+				unlink(h->h_iop->io_name);
+			if (hl == NULL)
+				acthere = h->h_next;
+			else
+				hl->h_next = h->h_next;
+		} else
+			hl = h;
+}
+
+tempname(tname)
+char *tname;
+{
+	static int inc;
+	register char *cp, *lp;
+
+	for (cp = tname, lp = "/tmp/shtm"; (*cp = *lp++) != '\0'; cp++)
+		;
+	lp = putn(getpid()*1000 + inc++);
+	for (; (*cp = *lp++) != '\0'; cp++)
+		;
+}

study/linux-travel/MINIX-1.5/1.5/Source/commands/sh/sh6.c

@@ -0,0 +1,8 @@
+#define Extern
+
+#include <sys/types.h>
+#include <signal.h>
+#include <errno.h>
+#include <setjmp.h>
+#include "sh.h"
+