From 12de6cf0d791bff627a6071519b71c19240aa1ce Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Wed, 4 Aug 2004 19:19:10 +0000
Subject: [PATCH] Michael Leibow, MichaelLe at belkin.com writes:

A question was posted a month ago by Mark Alamo to see if others had
problems with sourcing subscripts within msh.  We asked his firm to fix the
msh.c bug he described because we didn't have enough time to do it
ourselves.

When msh.c is executing a compound statement and there is a . command to
source another script file, msh.c will not execute the subscript until it's
completed executing the rest of the compound statement.

His example was this:

Echo "Start" ; . ./subA; echo "mid" ; . ./subB ; echo "end"

subA and subB execute AFTER end is printed in reverse order.  The same is
true if the sourced files are inside an if else fi, case esac, or any
compound statement.

Attached is a patch to msh.c.  It fixes the problem.  Cd to the root of your
busybox tree and execute "patch -p1 < msh.c.patch"

Unfortunately, I won't have more time to work on this so I hope that there
aren't any problems!

Michael Leibow
Senior Software Engineer

Belkin Corporation
---
 shell/msh.c | 1431 +++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 1056 insertions(+), 375 deletions(-)

diff --git a/shell/msh.c b/shell/msh.c
index 722d90d57..22a617095 100644
--- a/shell/msh.c
+++ b/shell/msh.c
@@ -49,24 +49,68 @@
 #include "busybox.h"
 
 
+/* Conditional use of "register" keyword */
+#define REGISTER register
+
+
+/*#define MSHDEBUG 1*/
+
+#ifdef MSHDEBUG
+int mshdbg = 0;
+
+#define DBGPRINTF(x)	if(mshdbg>0)printf x
+#define DBGPRINTF0(x)	if(mshdbg>0)printf x
+#define DBGPRINTF1(x)	if(mshdbg>1)printf x
+#define DBGPRINTF2(x)	if(mshdbg>2)printf x
+#define DBGPRINTF3(x)	if(mshdbg>3)printf x
+#define DBGPRINTF4(x)	if(mshdbg>4)printf x
+#define DBGPRINTF5(x)	if(mshdbg>5)printf x
+#define DBGPRINTF6(x)	if(mshdbg>6)printf x
+#define DBGPRINTF7(x)	if(mshdbg>7)printf x
+#define DBGPRINTF8(x)	if(mshdbg>8)printf x
+#define DBGPRINTF9(x)	if(mshdbg>9)printf x
+
+int mshdbg_rc = 0;
+
+#define RCPRINTF(x)		if(mshdbg_rc)printf x
+
+#else
+
+#define DBGPRINTF(x)
+#define DBGPRINTF0(x)
+#define DBGPRINTF1(x)
+#define DBGPRINTF2(x)
+#define DBGPRINTF3(x)
+#define DBGPRINTF4(x)
+#define DBGPRINTF5(x)
+#define DBGPRINTF6(x)
+#define DBGPRINTF7(x)
+#define DBGPRINTF8(x)
+#define DBGPRINTF9(x)
+
+#define RCPRINTF(x)
+
+#endif							/* MSHDEBUG */
+
+
 /* -------- sh.h -------- */
 /*
  * shell
  */
 
-#define	LINELIM	2100
-#define	NPUSH	8				/* limit to input nesting */
+#define	LINELIM	  2100
+#define	NPUSH	  8				/* limit to input nesting */
 
 #undef NOFILE
-#define	NOFILE	20				/* Number of open files */
-#define	NUFILE	10				/* Number of user-accessible files */
-#define	FDBASE	10				/* First file usable by Shell */
+#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	WAITSIG(s)  ((s)&0177)
+#define	WAITVAL(s)  (((s)>>8)&0377)
 #define	WAITCORE(s) (((s)&0200)!=0)
 
 /*
@@ -102,18 +146,43 @@ struct op {
 #define	TPAREN	2				/* (c-list) */
 #define	TPIPE	3				/* a | b */
 #define	TLIST	4				/* a [&;] b */
-#define	TOR	5					/* || */
+#define	TOR		5				/* || */
 #define	TAND	6				/* && */
 #define	TFOR	7
-#define	TDO	8
+#define	TDO		8
 #define	TCASE	9
-#define	TIF	10
+#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 & */
+/* Added to support "." file expansion */
+#define	TDOT	17
+
+/* Strings for names to make debug easier */
+char *T_CMD_NAMES[] = {
+	"PLACEHOLDER",
+	"TCOM",
+	"TPAREN",
+	"TPIPE",
+	"TLIST",
+	"TOR",
+	"TAND",
+	"TFOR",
+	"TDO",
+	"TCASE",
+	"TIF",
+	"TWHILE",
+	"TUNTIL",
+	"TELIF",
+	"TPAT",
+	"TBRACE",
+	"TASYNC",
+	"TDOT",
+};
+
 
 /*
  * actions determining the environment of a process
@@ -121,30 +190,25 @@ struct op {
 #define	BIT(i)	(1<<(i))
 #define	FEXEC	BIT(0)			/* execute without forking */
 
+#if 0							/* Original value */
+#define AREASIZE	(65000)
+#else
+#define AREASIZE	(90000)
+#endif
+
 /*
  * 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	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)
 
-static char **dolv;
-static int dolc;
-static int exstat;
-static char gflg;
-static int interactive;			/* Is this an interactive shell */
-static int execflg;
-static int multiline;			/* \n changed to ; */
-static struct op *outtree;		/* result from parser */
 
-static xint *failpt;
-static xint *errpt;
-static struct brkcon *brklist;
-static int isbreak;
+/* PROTOTYPES */
 static int newfile(char *s);
 static char *findeq(char *cp);
 static char *cclass(char *p, int sub);
@@ -157,6 +221,7 @@ struct brkcon {
 	struct brkcon *nextlev;
 };
 
+
 /*
  * redirection
  */
@@ -166,18 +231,17 @@ struct ioword {
 	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	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 */
 
-static struct wdblock *wdlist;
-static struct wdblock *iolist;
+
 
 /*
  * parsing & execution environment
@@ -186,7 +250,7 @@ static struct env {
 	char *linep;
 	struct io *iobase;
 	struct io *iop;
-	xint *errpt;
+	xint *errpt;				/* void * */
 	int iofd;
 	struct env *oenv;
 } e;
@@ -217,12 +281,12 @@ static int yynerrs;				/* yacc */
 static char line[LINELIM];
 static char *elinep;
 
+
 /*
  * other functions
  */
 static int (*inbuilt(char *s)) (struct op *);
 
-
 static char *rexecve(char *c, char **v, char **envp);
 static char *space(int n);
 static char *strsave(char *s, int a);
@@ -235,7 +299,7 @@ static int rlookup(char *n);
 static struct wdblock *glob(char *cp, struct wdblock *wb);
 static int my_getc(int ec);
 static int subgetc(int ec, int quoted);
-static char **makenv(void);
+static char **makenv(int all);
 static char **eval(char **ap, int f);
 static int setstatus(int s);
 static int waitfor(int lastpid, int canintr);
@@ -253,6 +317,7 @@ static void onecommand(void);
 static void runtrap(int i);
 static int gmatch(char *s, char *p);
 
+
 /*
  * error handling
  */
@@ -265,13 +330,13 @@ static void sig(int i);			/* default signal handler */
 
 /* -------- area stuff -------- */
 
-#define	REGSIZE		sizeof(struct region)
-#define GROWBY		256
-//#define   SHRINKBY   64
+#define	REGSIZE	  sizeof(struct region)
+#define GROWBY	  (256)
+/* #define	SHRINKBY   (64) */
 #undef	SHRINKBY
-#define FREE 32767
-#define BUSY 0
-#define	ALIGN (sizeof(int)-1)
+#define FREE 	  (32767)
+#define BUSY 	  (0)
+#define	ALIGN 	  (sizeof(int)-1)
 
 
 struct region {
@@ -293,25 +358,29 @@ typedef union {
 #define	LOGAND	257
 #define	LOGOR	258
 #define	BREAK	259
-#define	IF	260
+#define	IF		260
 #define	THEN	261
 #define	ELSE	262
 #define	ELIF	263
-#define	FI	264
+#define	FI		264
 #define	CASE	265
 #define	ESAC	266
-#define	FOR	267
+#define	FOR		267
 #define	WHILE	268
 #define	UNTIL	269
-#define	DO	270
+#define	DO		270
 #define	DONE	271
-#define	IN	272
+#define	IN		272
+/* Added for "." file expansion */
+#define	DOT		273
+
 #define	YYERRCODE 300
 
 /* flags to yylex */
 #define	CONTIN	01				/* skip new lines to complete command */
 
 #define	SYNTAXERR	zzerr()
+
 static struct op *pipeline(int cf);
 static struct op *andor(void);
 static struct op *c_list(void);
@@ -357,15 +426,6 @@ struct var {
 #define	EXPORT	02				/* variable is to be exported */
 #define	GETCELL	04				/* name & value space was got with getcell */
 
-static struct var *vlist;		/* dictionary */
-
-static struct var *homedir;		/* home directory */
-static struct var *prompt;		/* main prompt */
-static struct var *cprompt;		/* continuation prompt */
-static struct var *path;		/* search path for commands */
-static struct var *shell;		/* shell to interpret command files */
-static struct var *ifs;			/* field separators */
-
 static int yyparse(void);
 static struct var *lookup(char *n);
 static void setval(struct var *vp, char *val);
@@ -380,6 +440,7 @@ static int eqname(char *n1, char *n2);
 
 static int execute(struct op *t, int *pin, int *pout, int act);
 
+
 /* -------- io.h -------- */
 /* io buffer */
 struct iobuf {
@@ -423,6 +484,7 @@ struct io {
 /* in substitution */
 #define	INSUB()	(e.iop->task == XGRAVE || e.iop->task == XDOLL)
 
+
 /*
  * input generators for IO structure
  */
@@ -443,6 +505,7 @@ static void markhere(char *s, struct ioword *iop);
 static int herein(char *hname, int xdoll);
 static int run(struct ioarg *argp, int (*f) (struct ioarg *));
 
+
 /*
  * IO functions
  */
@@ -455,6 +518,7 @@ static void prn(unsigned u);
 static void closef(int i);
 static void closeall(void);
 
+
 /*
  * IO control
  */
@@ -464,8 +528,6 @@ static int openpipe(int *pv);
 static void closepipe(int *pv);
 static struct io *setbase(struct io *ip);
 
-static 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)))
 
@@ -497,14 +559,13 @@ static void freearea(int a);
 static void freecell(char *cp);
 static int areanum;				/* current allocation area */
 
-#define	NEW(type) (type *)getcell(sizeof(type))
+#define	NEW(type)   (type *)getcell(sizeof(type))
 #define	DELETE(obj)	freecell((char *)obj)
 
 
 /* -------- misc stuff -------- */
 
-static int forkexec(struct op *t, int *pin, int *pout, int act, char **wp,
-					int *pforked);
+static int forkexec(struct op *t, int *pin, int *pout, int act, char **wp);
 static int iosetup(struct ioword *iop, int pipein, int pipeout);
 static void echo(char **wp);
 static struct op **find1case(struct op *t, char *w);
@@ -599,12 +660,12 @@ static struct res restab[] = {
 	{"elif", ELIF},
 	{"until", UNTIL},
 	{"fi", FI},
-
 	{";;", BREAK},
 	{"||", LOGOR},
 	{"&&", LOGAND},
 	{"{", '{'},
 	{"}", '}'},
+	{".", DOT},
 	{0, 0},
 };
 
@@ -637,13 +698,18 @@ static const struct builtincmd builtincmds[] = {
 	{0, 0}
 };
 
+static int expand_dotnode(struct op *);
+struct op *scantree(struct op *);
+static struct op *dowholefile(int, int);
+
 /* Globals */
 extern char **environ;			/* environment pointer */
+
 static char **dolv;
 static int dolc;
 static int exstat;
 static char gflg;
-static int interactive;			/* Is this an interactive shell */
+static int interactive = 0;		/* Is this an interactive shell */
 static int execflg;
 static int multiline;			/* \n changed to ; */
 static struct op *outtree;		/* result from parser */
@@ -658,6 +724,10 @@ static char ourtrap[_NSIG + 1];
 static int trapset;				/* trap pending */
 static int yynerrs;				/* yacc */
 static char line[LINELIM];
+
+#ifdef MSHDEBUG
+static struct var *mshdbg_var;
+#endif
 static struct var *vlist;		/* dictionary */
 static struct var *homedir;		/* home directory */
 static struct var *prompt;		/* main prompt */
@@ -665,29 +735,29 @@ static struct var *cprompt;		/* continuation prompt */
 static struct var *path;		/* search path for commands */
 static struct var *shell;		/* shell to interpret command files */
 static struct var *ifs;			/* field separators */
-static struct ioarg ioargstack[NPUSH];
-static struct io iostack[NPUSH];
+
 static int areanum;				/* current allocation area */
 static int intr;
 static int inparse;
 static char flags['z' - 'a' + 1];
 static char *flag = flags - 'a';
-static char *elinep = line + sizeof(line) - 5;
 static char *null = "";
 static int heedint = 1;
-static struct env e =
-	{ line, iostack, iostack - 1, (xint *) NULL, FDBASE,
-(struct env *) NULL };
 static void (*qflag) (int) = SIG_IGN;
 static int startl;
 static int peeksym;
 static int nlseen;
 static int iounit = IODEFAULT;
 static YYSTYPE yylval;
+static char *elinep = line + sizeof(line) - 5;
+
+static struct ioarg temparg = { 0, 0, 0, AFID_NOBUF, 0 };	/* temporary for PUSHIO */
+static struct ioarg ioargstack[NPUSH];
+static struct io iostack[NPUSH];
 static struct iobuf sharedbuf = { AFID_NOBUF };
 static struct iobuf mainbuf = { AFID_NOBUF };
 static unsigned bufid = AFID_ID;	/* buffer id counter */
-static struct ioarg temparg = { 0, 0, 0, AFID_NOBUF, 0 };
+
 static struct here *inhere;		/* list of hear docs while parsing */
 static struct here *acthere;	/* list of active here documents */
 static struct region *areabot;	/* bottom of area */
@@ -696,6 +766,48 @@ static struct region *areanxt;	/* starting point of scan */
 static void *brktop;
 static void *brkaddr;
 
+static struct env e = {
+	line,						/* linep:  char ptr */
+	iostack,					/* iobase:  struct io ptr */
+	iostack - 1,				/* iop:  struct io ptr */
+	(xint *) NULL,				/* errpt:  void ptr for errors? */
+	FDBASE,						/* iofd:  file desc  */
+	(struct env *) NULL			/* oenv:  struct env ptr */
+};
+
+#ifdef MSHDEBUG
+void print_t(struct op *t)
+{
+	DBGPRINTF(("T: t=0x%x, type %s, words=0x%x, IOword=0x%x\n", t,
+			   T_CMD_NAMES[t->type], t->words, t->ioact));
+
+	if (t->words) {
+		DBGPRINTF(("T: W1: %s", t->words[0]));
+	}
+
+	return;
+}
+
+void print_tree(struct op *head)
+{
+	if (head == NULL) {
+		DBGPRINTF(("PRINT_TREE: no tree\n"));
+		return;
+	}
+
+	DBGPRINTF(("NODE: 0x%x,  left 0x%x, right 0x%x\n", head, head->left,
+			   head->right));
+
+	if (head->left)
+		print_tree(head->left);
+
+	if (head->right)
+		print_tree(head->right);
+
+	return;
+}
+#endif							/* MSHDEBUG */
+
 
 #ifdef CONFIG_FEATURE_COMMAND_EDITING
 static char *current_prompt;
@@ -709,12 +821,14 @@ static char *current_prompt;
 
 extern int msh_main(int argc, char **argv)
 {
-	register int f;
-	register char *s;
+	REGISTER int f;
+	REGISTER char *s;
 	int cflag;
 	char *name, **ap;
 	int (*iof) (struct ioarg *);
 
+	DBGPRINTF(("MSH_MAIN: argc %d, environ 0x%x\n", argc, environ));
+
 	initarea();
 	if ((ap = environ) != NULL) {
 		while (*ap)
@@ -750,6 +864,13 @@ extern int msh_main(int argc, char **argv)
 	if (ifs->value == null)
 		setval(ifs, " \t\n");
 
+#ifdef MSHDEBUG
+	mshdbg_var = lookup("MSHDEBUG");
+	if (mshdbg_var->value == null)
+		setval(mshdbg_var, "0");
+#endif
+
+
 	prompt = lookup("PS1");
 #ifdef CONFIG_FEATURE_SH_FANCY_PROMPT
 	if (prompt->value == null)
@@ -806,26 +927,44 @@ extern int msh_main(int argc, char **argv)
 			argv--;
 			argc++;
 		}
+
 		if (iof == filechar && --argc > 0) {
 			setval(prompt, "");
 			setval(cprompt, "");
 			prompt->status &= ~EXPORT;
 			cprompt->status &= ~EXPORT;
+
+/* Shell is non-interactive, activate printf-based debug */
+#ifdef MSHDEBUG
+			mshdbg = (int) (((char) (mshdbg_var->value[0])) - '0');
+			if (mshdbg < 0)
+				mshdbg = 0;
+#endif
+			DBGPRINTF(("MSH_MAIN: calling newfile()\n"));
+
 			if (newfile(name = *++argv))
-				exit(1);
+				exit(1);		/* Exit on error */
 		}
 	}
+
 	setdash();
+
+	/* This won't be true if PUSHIO has been called, say from newfile() above */
 	if (e.iop < iostack) {
 		PUSHIO(afile, 0, iof);
 		if (isatty(0) && isatty(1) && !cflag) {
 			interactive++;
 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
+#ifdef MSHDEBUG
+			printf("\n\n" BB_BANNER " Built-in shell (msh with debug)\n");
+#else
 			printf("\n\n" BB_BANNER " Built-in shell (msh)\n");
+#endif
 			printf("Enter 'help' for a list of built-in commands.\n\n");
 #endif
 		}
 	}
+
 	signal(SIGQUIT, qflag);
 	if (name && name[0] == '-') {
 		interactive++;
@@ -836,6 +975,7 @@ extern int msh_main(int argc, char **argv)
 	}
 	if (interactive)
 		signal(SIGTERM, sig);
+
 	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
 		signal(SIGINT, onintr);
 	dolv = argv;
@@ -852,6 +992,8 @@ extern int msh_main(int argc, char **argv)
 	}
 	setval(lookup("#"), putn((--dolc < 0) ? (dolc = 0) : dolc));
 
+	DBGPRINTF(("MSH_MAIN: begin FOR loop, interactive %d, e.iop 0x%x, iostack 0x%x\n", interactive, e.iop, iostack));
+
 	for (;;) {
 		if (interactive && e.iop <= iostack) {
 #ifdef CONFIG_FEATURE_COMMAND_EDITING
@@ -864,12 +1006,14 @@ extern int msh_main(int argc, char **argv)
 		/* Ensure that getenv("PATH") stays current */
 		setenv("PATH", path->value, 1);
 	}
+
+	DBGPRINTF(("MSH_MAIN: returning.\n"));
 }
 
 static void setdash()
 {
-	register char *cp;
-	register int c;
+	REGISTER char *cp;
+	REGISTER int c;
 	char m['z' - 'a' + 1];
 
 	cp = m;
@@ -881,11 +1025,14 @@ static void setdash()
 }
 
 static int newfile(s)
-register char *s;
+REGISTER char *s;
 {
-	register int f;
+	REGISTER int f;
+
+	DBGPRINTF7(("NEWFILE: opening %s\n", s));
 
 	if (strcmp(s, "-") != 0) {
+		DBGPRINTF(("NEWFILE: s is %s\n", s));
 		f = open(s, 0);
 		if (f < 0) {
 			prs(s);
@@ -894,17 +1041,73 @@ register char *s;
 		}
 	} else
 		f = 0;
+
 	next(remap(f));
 	return (0);
 }
 
+
+static int expand_dotnode(node)
+struct op *node;
+{
+	struct op *outtree_save = outtree;
+
+	node->type = TDOT;
+	newfile(node->words[1]);
+
+	node->left = dowholefile(TDOT, 0);
+
+	node->right = NULL;
+
+	outtree = outtree_save;
+
+	return (1);
+}
+
+struct op *scantree(head)
+struct op *head;
+{
+	struct op *dotnode;
+
+	if (head == NULL)
+		return (NULL);
+
+	if (head->left != NULL) {
+		dotnode = scantree(head->left);
+		if (dotnode)
+			return (dotnode);
+	}
+
+	if (head->right != NULL) {
+		dotnode = scantree(head->right);
+		if (dotnode)
+			return (dotnode);
+	}
+
+	if (head->words == NULL)
+		return (NULL);
+
+	DBGPRINTF5(("SCANTREE: checking node 0x%x\n", head));
+
+	if ((head->type != TDOT) && (strcmp(".", head->words[0]) == 0)) {
+		DBGPRINTF5(("SCANTREE: dot found in node 0x%x\n", head));
+		return (head);
+	}
+
+	return (NULL);
+}
+
+
 static void onecommand()
 {
-	register int i;
+	REGISTER int i;
 	jmp_buf m1;
 
+	DBGPRINTF(("ONECOMMAND: enter, outtree=0x%x\n", outtree));
+
 	while (e.oenv)
 		quitenv();
+
 	areanum = 1;
 	freehere(areanum);
 	freearea(areanum);
@@ -918,8 +1121,12 @@ static void onecommand()
 	inparse = 1;
 	intr = 0;
 	execflg = 0;
+
 	setjmp(failpt = m1);		/* Bruce Evans' fix */
 	if (setjmp(failpt = m1) || yyparse() || intr) {
+
+		DBGPRINTF(("ONECOMMAND: this is not good.\n"));
+
 		while (e.oenv)
 			quitenv();
 		scraphere();
@@ -929,16 +1136,23 @@ static void onecommand()
 		intr = 0;
 		return;
 	}
+
 	inparse = 0;
 	brklist = 0;
 	intr = 0;
 	execflg = 0;
-	if (!flag['n'])
+
+	if (!flag['n']) {
+		DBGPRINTF(("ONECOMMAND: calling execute, t=outtree=0x%x\n",
+				   outtree));
 		execute(outtree, NOPIPE, NOPIPE, 0);
+	}
+
 	if (!interactive && intr) {
 		execflg = 0;
 		leave();
 	}
+
 	if ((i = trapset) != 0) {
 		trapset = 0;
 		runtrap(i);
@@ -953,17 +1167,19 @@ static void fail()
 
 static void leave()
 {
+	DBGPRINTF(("LEAVE: leave called!\n"));
+
 	if (execflg)
 		fail();
 	scraphere();
 	freehere(1);
 	runtrap(0);
-	exit(exstat);
+	_exit(exstat);
 	/* NOTREACHED */
 }
 
 static void warn(s)
-register char *s;
+REGISTER char *s;
 {
 	if (*s) {
 		prs(s);
@@ -991,12 +1207,15 @@ char *s;
 static int newenv(f)
 int f;
 {
-	register struct env *ep;
+	REGISTER struct env *ep;
+
+	DBGPRINTF(("NEWENV: f=%d (indicates quitenv and return)\n", f));
 
 	if (f) {
 		quitenv();
 		return (1);
 	}
+
 	ep = (struct env *) space(sizeof(*ep));
 	if (ep == NULL) {
 		while (e.oenv)
@@ -1006,13 +1225,16 @@ int f;
 	*ep = e;
 	e.oenv = ep;
 	e.errpt = errpt;
+
 	return (0);
 }
 
 static void quitenv()
 {
-	register struct env *ep;
-	register int fd;
+	REGISTER struct env *ep;
+	REGISTER int fd;
+
+	DBGPRINTF(("QUITENV: e.oenv=0x%x\n", e.oenv));
 
 	if ((ep = e.oenv) != NULL) {
 		fd = e.iofd;
@@ -1028,7 +1250,7 @@ static void quitenv()
  * Is any character from s1 in s2?
  */
 static int anys(s1, s2)
-register char *s1, *s2;
+REGISTER char *s1, *s2;
 {
 	while (*s1)
 		if (any(*s1++, s2))
@@ -1040,8 +1262,8 @@ register char *s1, *s2;
  * Is character c in s?
  */
 static int any(c, s)
-register int c;
-register char *s;
+REGISTER int c;
+REGISTER char *s;
 {
 	while (*s)
 		if (*s++ == c)
@@ -1050,13 +1272,13 @@ register char *s;
 }
 
 static char *putn(n)
-register int n;
+REGISTER int n;
 {
 	return (itoa(n));
 }
 
 static char *itoa(n)
-register int n;
+REGISTER int n;
 {
 	static char s[20];
 
@@ -1064,6 +1286,7 @@ register int n;
 	return (s);
 }
 
+
 static void next(int f)
 {
 	PUSHIO(afile, f, filechar);
@@ -1088,7 +1311,7 @@ int s;							/* ANSI C requires a parameter */
 static char *space(n)
 int n;
 {
-	register char *cp;
+	REGISTER char *cp;
 
 	if ((cp = getcell(n)) == 0)
 		err("out of string space");
@@ -1096,10 +1319,10 @@ int n;
 }
 
 static char *strsave(s, a)
-register char *s;
+REGISTER char *s;
 int a;
 {
-	register char *cp, *xp;
+	REGISTER char *cp, *xp;
 
 	if ((cp = space(strlen(s) + 1)) != NULL) {
 		setarea((char *) cp, a);
@@ -1113,7 +1336,7 @@ int a;
  * trap handling
  */
 static void sig(i)
-register int i;
+REGISTER int i;
 {
 	trapset = i;
 	signal(i, sig);
@@ -1126,8 +1349,10 @@ int i;
 
 	if ((trapstr = trap[i]) == NULL)
 		return;
+
 	if (i == 0)
 		trap[i] = 0;
+
 	RUN(aword, trapstr, nlchar);
 }
 
@@ -1140,11 +1365,11 @@ int i;
  * return a null value.
  */
 static struct var *lookup(n)
-register char *n;
+REGISTER char *n;
 {
-	register struct var *vp;
-	register char *cp;
-	register int c;
+	REGISTER struct var *vp;
+	REGISTER char *cp;
+	REGISTER int c;
 	static struct var dummy;
 
 	if (isdigit(*n)) {
@@ -1195,10 +1420,10 @@ char *val;
  * values is reasonably painless.
  */
 static void nameval(vp, val, name)
-register struct var *vp;
+REGISTER struct var *vp;
 char *val, *name;
 {
-	register char *cp, *xp;
+	REGISTER char *cp, *xp;
 	char *nv;
 	int fl;
 
@@ -1245,23 +1470,28 @@ struct var *vp;
 }
 
 static int isassign(s)
-register char *s;
+REGISTER char *s;
 {
+	DBGPRINTF7(("ISASSIGN: enter, s=%s\n", s));
+
 	if (!isalpha((int) *s) && *s != '_')
 		return (0);
 	for (; *s != '='; s++)
 		if (*s == 0 || (!isalnum(*s) && *s != '_'))
 			return (0);
+
 	return (1);
 }
 
 static int assign(s, cf)
-register char *s;
+REGISTER char *s;
 int cf;
 {
-	register char *cp;
+	REGISTER char *cp;
 	struct var *vp;
 
+	DBGPRINTF7(("ASSIGN: enter, s=%s, cf=%d\n", s, cf));
+
 	if (!isalpha(*s) && *s != '_')
 		return (0);
 	for (cp = s; *cp != '='; cp++)
@@ -1275,8 +1505,10 @@ int cf;
 }
 
 static int checkname(cp)
-register char *cp;
+REGISTER char *cp;
 {
+	DBGPRINTF7(("CHECKNAME: enter, cp=%s\n", cp));
+
 	if (!isalpha(*cp++) && *(cp - 1) != '_')
 		return (0);
 	while (*cp)
@@ -1286,9 +1518,9 @@ register char *cp;
 }
 
 static void putvlist(f, out)
-register int f, out;
+REGISTER int f, out;
 {
-	register struct var *vp;
+	REGISTER struct var *vp;
 
 	for (vp = vlist; vp; vp = vp->next)
 		if (vp->status & f && (isalpha(*vp->name) || *vp->name == '_')) {
@@ -1302,7 +1534,7 @@ register int f, out;
 }
 
 static int eqname(n1, n2)
-register char *n1, *n2;
+REGISTER char *n1, *n2;
 {
 	for (; *n1 != '=' && *n1 != 0; n1++)
 		if (*n2++ != *n1)
@@ -1311,7 +1543,7 @@ register char *n1, *n2;
 }
 
 static char *findeq(cp)
-register char *cp;
+REGISTER char *cp;
 {
 	while (*cp != '\0' && *cp != '=')
 		cp++;
@@ -1332,9 +1564,9 @@ register char *cp;
 #define	NOT	'!'					/* might use ^ */
 
 static int gmatch(s, p)
-register char *s, *p;
+REGISTER char *s, *p;
 {
-	register int sc, pc;
+	REGISTER int sc, pc;
 
 	if (s == NULL || p == NULL)
 		return (0);
@@ -1368,10 +1600,10 @@ register char *s, *p;
 }
 
 static char *cclass(p, sub)
-register char *p;
-register int sub;
+REGISTER char *p;
+REGISTER int sub;
 {
-	register int c, d, not, found;
+	REGISTER int c, d, not, found;
 
 	if ((not = *p == NOT) != 0)
 		p++;
@@ -1404,8 +1636,8 @@ register int sub;
 
 static void initarea()
 {
-	brkaddr = malloc(65000);
-	brktop = brkaddr + 65000;
+	brkaddr = malloc(AREASIZE);
+	brktop = brkaddr + AREASIZE;
 
 	while ((int) sbrk(0) & ALIGN)
 		sbrk(1);
@@ -1420,9 +1652,9 @@ static void initarea()
 char *getcell(nbytes)
 unsigned nbytes;
 {
-	register int nregio;
-	register struct region *p, *q;
-	register int i;
+	REGISTER int nregio;
+	REGISTER struct region *p, *q;
+	REGISTER int i;
 
 	if (nbytes == 0) {
 		puts("getcell(0)");
@@ -1489,7 +1721,7 @@ unsigned nbytes;
 static void freecell(cp)
 char *cp;
 {
-	register struct region *p;
+	REGISTER struct region *p;
 
 	if ((p = (struct region *) cp) != NULL) {
 		p--;
@@ -1500,9 +1732,9 @@ char *cp;
 }
 
 static void freearea(a)
-register int a;
+REGISTER int a;
 {
-	register struct region *p, *top;
+	REGISTER struct region *p, *top;
 
 	top = areatop;
 	for (p = areabot; p != top; p = p->next)
@@ -1514,7 +1746,7 @@ static void setarea(cp, a)
 char *cp;
 int a;
 {
-	register struct region *p;
+	REGISTER struct region *p;
 
 	if ((p = (struct region *) cp) != NULL)
 		(p - 1)->area = a;
@@ -1528,7 +1760,7 @@ char *cp;
 
 static void garbage()
 {
-	register struct region *p, *q, *top;
+	REGISTER struct region *p, *q, *top;
 
 	top = areatop;
 	for (p = areabot; p != top; p = p->next) {
@@ -1553,9 +1785,10 @@ static void garbage()
  * shell: syntax (C version)
  */
 
-
 int yyparse()
 {
+	DBGPRINTF7(("YYPARSE: enter...\n"));
+
 	startl = 1;
 	peeksym = 0;
 	yynerrs = 0;
@@ -1567,96 +1800,136 @@ int yyparse()
 static struct op *pipeline(cf)
 int cf;
 {
-	register struct op *t, *p;
-	register int c;
+	REGISTER struct op *t, *p;
+	REGISTER int c;
+
+	DBGPRINTF7(("PIPELINE: enter, cf=%d\n", cf));
 
 	t = command(cf);
+
+	DBGPRINTF9(("PIPELINE: t=0x%x\n", t));
+
 	if (t != NULL) {
 		while ((c = yylex(0)) == '|') {
-			if ((p = command(CONTIN)) == NULL)
+			if ((p = command(CONTIN)) == NULL) {
+				DBGPRINTF8(("PIPELINE: error!\n"));
 				SYNTAXERR;
+			}
+
 			if (t->type != TPAREN && t->type != TCOM) {
 				/* shell statement */
 				t = block(TPAREN, t, NOBLOCK, NOWORDS);
 			}
+
 			t = block(TPIPE, t, p, NOWORDS);
 		}
 		peeksym = c;
 	}
+
+	DBGPRINTF7(("PIPELINE: returning t=0x%x\n", t));
 	return (t);
 }
 
 static struct op *andor()
 {
-	register struct op *t, *p;
-	register int c;
+	REGISTER struct op *t, *p;
+	REGISTER int c;
+
+	DBGPRINTF7(("ANDOR: enter...\n"));
 
 	t = pipeline(0);
+
+	DBGPRINTF9(("ANDOR: t=0x%x\n", t));
+
 	if (t != NULL) {
 		while ((c = yylex(0)) == LOGAND || c == LOGOR) {
-			if ((p = pipeline(CONTIN)) == NULL)
+			if ((p = pipeline(CONTIN)) == NULL) {
+				DBGPRINTF8(("ANDOR: error!\n"));
 				SYNTAXERR;
+			}
+
 			t = block(c == LOGAND ? TAND : TOR, t, p, NOWORDS);
-		}
+		}						/* WHILE */
+
 		peeksym = c;
 	}
+
+	DBGPRINTF7(("ANDOR: returning t=0x%x\n", t));
 	return (t);
 }
 
 static struct op *c_list()
 {
-	register struct op *t, *p;
-	register int c;
+	REGISTER struct op *t, *p;
+	REGISTER int c;
+
+	DBGPRINTF7(("C_LIST: enter...\n"));
 
 	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);
-		}
+		}						/* WHILE */
+
 		peeksym = c;
 	}
+	/* IF */
+	DBGPRINTF7(("C_LIST: returning t=0x%x\n", t));
 	return (t);
 }
 
-
 static int synio(cf)
 int cf;
 {
-	register struct ioword *iop;
-	register int i;
-	register int c;
+	REGISTER struct ioword *iop;
+	REGISTER int i;
+	REGISTER int c;
+
+	DBGPRINTF7(("SYNIO: enter, cf=%d\n", cf));
 
 	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);
+
+	DBGPRINTF7(("SYNIO: returning 1\n"));
 	return (1);
 }
 
 static void musthave(c, cf)
 int c, cf;
 {
-	if ((peeksym = yylex(cf)) != c)
+	if ((peeksym = yylex(cf)) != c) {
+		DBGPRINTF7(("MUSTHAVE: error!\n"));
 		SYNTAXERR;
+	}
+
 	peeksym = 0;
 }
 
 static struct op *simple()
 {
-	register struct op *t;
+	REGISTER struct op *t;
 
 	t = NULL;
 	for (;;) {
@@ -1684,7 +1957,9 @@ static struct op *simple()
 static struct op *nested(type, mark)
 int type, mark;
 {
-	register struct op *t;
+	REGISTER struct op *t;
+
+	DBGPRINTF3(("NESTED: enter, type=%d, mark=%d\n", type, mark));
 
 	multiline++;
 	t = c_list();
@@ -1696,17 +1971,24 @@ int type, mark;
 static struct op *command(cf)
 int cf;
 {
-	register struct op *t;
+	REGISTER struct op *t;
 	struct wdblock *iosave;
-	register int c;
+	REGISTER int c;
+
+	DBGPRINTF(("COMMAND: enter, cf=%d\n", cf));
 
 	iosave = iolist;
 	iolist = NULL;
+
 	if (multiline)
 		cf |= CONTIN;
+
 	while (synio(cf))
 		cf = 0;
-	switch (c = yylex(cf)) {
+
+	c = yylex(cf);
+
+	switch (c) {
 	default:
 		peeksym = c;
 		if ((t = simple()) == NULL) {
@@ -1759,7 +2041,9 @@ int cf;
 		multiline++;
 		musthave(IN, CONTIN);
 		startl++;
+
 		t->left = caselist();
+
 		musthave(ESAC, 0);
 		multiline--;
 		break;
@@ -1773,18 +2057,52 @@ int cf;
 		musthave(FI, 0);
 		multiline--;
 		break;
+
+	case DOT:
+		t = newtp();
+		t->type = TDOT;
+
+		musthave(WORD, 0);		/* gets name of file */
+		DBGPRINTF7(("COMMAND: DOT clause, yylval.cp is %s\n", yylval.cp));
+
+		word(yylval.cp);		/* add word to wdlist */
+		word(NOWORD);			/* terminate  wdlist */
+		t->words = copyw();		/* dup wdlist */
+		break;
+
 	}
+
 	while (synio(0));
+
 	t = namelist(t);
 	iolist = iosave;
+
+	DBGPRINTF(("COMMAND: returning 0x%x\n", t));
+
+	return (t);
+}
+
+static struct op *dowholefile(type, mark)
+int type;
+int mark;
+{
+	REGISTER struct op *t;
+
+	DBGPRINTF(("DOWHOLEFILE: enter, type=%d, mark=%d\n", type, mark));
+
+	multiline++;
+	t = c_list();
+	multiline--;
+	t = block(type, t, NOBLOCK, NOWORDS);
+	DBGPRINTF(("DOWHOLEFILE: return t=0x%x\n", t));
 	return (t);
 }
 
 static struct op *dogroup(onlydone)
 int onlydone;
 {
-	register int c;
-	register struct op *mylist;
+	REGISTER int c;
+	REGISTER struct op *mylist;
 
 	c = yylex(CONTIN);
 	if (c == DONE && onlydone)
@@ -1798,8 +2116,8 @@ int onlydone;
 
 static struct op *thenpart()
 {
-	register int c;
-	register struct op *t;
+	REGISTER int c;
+	REGISTER struct op *t;
 
 	if ((c = yylex(0)) != THEN) {
 		peeksym = c;
@@ -1816,8 +2134,8 @@ static struct op *thenpart()
 
 static struct op *elsepart()
 {
-	register int c;
-	register struct op *t;
+	REGISTER int c;
+	REGISTER struct op *t;
 
 	switch (c = yylex(0)) {
 	case ELSE:
@@ -1840,17 +2158,23 @@ static struct op *elsepart()
 
 static struct op *caselist()
 {
-	register struct op *t;
+	REGISTER struct op *t;
 
 	t = NULL;
-	while ((peeksym = yylex(CONTIN)) != ESAC)
+	while ((peeksym = yylex(CONTIN)) != ESAC) {
+		DBGPRINTF(("CASELIST, doing yylex, peeksym=%d\n", peeksym));
 		t = list(t, casepart());
+	}
+
+	DBGPRINTF(("CASELIST, returning t=0x%x\n", t));
 	return (t);
 }
 
 static struct op *casepart()
 {
-	register struct op *t;
+	REGISTER struct op *t;
+
+	DBGPRINTF7(("CASEPART: enter...\n"));
 
 	t = newtp();
 	t->type = TPAT;
@@ -1859,12 +2183,15 @@ static struct op *casepart()
 	t->left = c_list();
 	if ((peeksym = yylex(CONTIN)) != ESAC)
 		musthave(BREAK, CONTIN);
+
+	DBGPRINTF7(("CASEPART: made newtp(TPAT, t=0x%x)\n", t));
+
 	return (t);
 }
 
 static char **pattern()
 {
-	register int c, cf;
+	REGISTER int c, cf;
 
 	cf = CONTIN;
 	do {
@@ -1874,12 +2201,13 @@ static char **pattern()
 	} while ((c = yylex(0)) == '|');
 	peeksym = c;
 	word(NOWORD);
+
 	return (copyw());
 }
 
 static char **wordlist()
 {
-	register int c;
+	REGISTER int c;
 
 	if ((c = yylex(0)) != IN) {
 		peeksym = c;
@@ -1897,12 +2225,15 @@ static char **wordlist()
  * supporting functions
  */
 static struct op *list(t1, t2)
-register struct op *t1, *t2;
+REGISTER struct op *t1, *t2;
 {
+	DBGPRINTF7(("LIST: enter, t1=0x%x, t2=0x%x\n", t1, t2));
+
 	if (t1 == NULL)
 		return (t2);
 	if (t2 == NULL)
 		return (t1);
+
 	return (block(TLIST, t1, t2, NOWORDS));
 }
 
@@ -1911,30 +2242,43 @@ int type;
 struct op *t1, *t2;
 char **wp;
 {
-	register struct op *t;
+	REGISTER struct op *t;
+
+	DBGPRINTF7(("BLOCK: enter, type=%d (%s)\n", type, T_CMD_NAMES[type]));
 
 	t = newtp();
 	t->type = type;
 	t->left = t1;
 	t->right = t2;
 	t->words = wp;
+
+	DBGPRINTF7(("BLOCK: inserted 0x%x between 0x%x and 0x%x\n", t, t1,
+				t2));
+
 	return (t);
 }
 
+/* See if given string is a shell multiline (FOR, IF, etc) */
 static int rlookup(n)
-register char *n;
+REGISTER char *n;
 {
-	register struct res *rp;
+	REGISTER struct res *rp;
+
+	DBGPRINTF7(("RLOOKUP: enter, n is %s\n", n));
 
 	for (rp = restab; rp->r_name; rp++)
-		if (strcmp(rp->r_name, n) == 0)
-			return (rp->r_val);
-	return (0);
+		if (strcmp(rp->r_name, n) == 0) {
+			DBGPRINTF7(("RLOOKUP: match, returning %d\n", rp->r_val));
+			return (rp->r_val);	/* Return numeric code for shell multiline */
+		}
+
+	DBGPRINTF7(("RLOOKUP: NO match, returning 0\n"));
+	return (0);					/* Not a shell multiline */
 }
 
 static struct op *newtp()
 {
-	register struct op *t;
+	REGISTER struct op *t;
 
 	t = (struct op *) tree(sizeof(*t));
 	t->type = 0;
@@ -1943,17 +2287,25 @@ static struct op *newtp()
 	t->left = NULL;
 	t->right = NULL;
 	t->str = NULL;
+
+	DBGPRINTF3(("NEWTP: allocated 0x%x\n", t));
+
 	return (t);
 }
 
 static struct op *namelist(t)
-register struct op *t;
+REGISTER struct op *t;
 {
+
+	DBGPRINTF7(("NAMELIST: enter, t=0x%x, type %s, iolist=0x%x\n", t,
+				T_CMD_NAMES[t->type], iolist));
+
 	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);
@@ -1962,14 +2314,17 @@ register struct op *t;
 		}
 		return (t);
 	}
+
 	word(NOWORD);
 	t->words = copyw();
+
+
 	return (t);
 }
 
 static char **copyw()
 {
-	register char **wd;
+	REGISTER char **wd;
 
 	wd = getwords(wdlist);
 	wdlist = 0;
@@ -1984,7 +2339,7 @@ char *cp;
 
 static struct ioword **copyio()
 {
-	register struct ioword **iop;
+	REGISTER struct ioword **iop;
 
 	iop = (struct ioword **) getwords(iolist);
 	iolist = 0;
@@ -1996,7 +2351,7 @@ int u;
 int f;
 char *cp;
 {
-	register struct ioword *iop;
+	REGISTER struct ioword *iop;
 
 	iop = (struct ioword *) tree(sizeof(*iop));
 	iop->io_unit = u;
@@ -2026,7 +2381,7 @@ char *s;
 static int yylex(cf)
 int cf;
 {
-	register int c, c1;
+	REGISTER int c, c1;
 	int atstart;
 
 	if ((c = peeksym) > 0) {
@@ -2035,14 +2390,21 @@ int cf;
 			startl = 1;
 		return (c);
 	}
+
+
 	nlseen = 0;
-	e.linep = line;
 	atstart = startl;
 	startl = 0;
 	yylval.i = 0;
+	e.linep = line;
+
+/* MALAMO */
+	line[LINELIM - 1] = '\0';
 
   loop:
-	while ((c = my_getc(0)) == ' ' || c == '\t');
+	while ((c = my_getc(0)) == ' ' || c == '\t')	/* Skip whitespace */
+		;
+
 	switch (c) {
 	default:
 		if (any(c, "0123456789")) {
@@ -2056,15 +2418,17 @@ int cf;
 		}
 		break;
 
-	case '#':
+	case '#':					/* Comment, skip to next newline or End-of-string */
 		while ((c = my_getc(0)) != 0 && c != '\n');
 		unget(c);
 		goto loop;
 
 	case 0:
+		DBGPRINTF5(("YYLEX: return 0, c=%d\n", c));
 		return (c);
 
 	case '$':
+		DBGPRINTF9(("YYLEX: found $\n"));
 		*e.linep++ = c;
 		if ((c = my_getc(0)) == '{') {
 			if ((c = collect(c, '}')) != '\0')
@@ -2083,12 +2447,13 @@ int cf;
 	case '|':
 	case '&':
 	case ';':
-		if ((c1 = dual(c)) != '\0') {
-			startl = 1;
-			return (c1);
-		}
 		startl = 1;
-		return (c);
+		/* If more chars process them, else return NULL char */
+		if ((c1 = dual(c)) != '\0')
+			return (c1);
+		else
+			return (c);
+
 	case '^':
 		startl = 1;
 		return ('|');
@@ -2123,28 +2488,37 @@ int cf;
 	unget(c);
 
   pack:
-	while ((c = my_getc(0)) != 0 && !any(c, "`$ '\"\t;&<>()|^\n"))
+	while ((c = my_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);
 }
 
+
 static int collect(c, c1)
-register int c, c1;
+REGISTER int c, c1;
 {
 	char s[2];
 
+	DBGPRINTF8(("COLLECT: enter, c=%d, c1=%d\n", c, c1));
+
 	*e.linep++ = c;
 	while ((c = my_getc(c1)) != c1) {
 		if (c == 0) {
@@ -2164,28 +2538,41 @@ register int c, c1;
 		}
 		*e.linep++ = c;
 	}
+
 	*e.linep++ = c;
+
+	DBGPRINTF8(("COLLECT: return 0, line is %s\n", line));
+
 	return (0);
 }
 
+/* "multiline commands" helper func */
+/* see if next 2 chars form a shell multiline */
 static int dual(c)
-register int c;
+REGISTER int c;
 {
 	char s[3];
-	register char *cp = s;
+	REGISTER char *cp = s;
 
-	*cp++ = c;
-	*cp++ = my_getc(0);
-	*cp = 0;
-	if ((c = rlookup(s)) == 0)
-		unget(*--cp);
-	return (c);
+	DBGPRINTF8(("DUAL: enter, c=%d\n", c));
+
+	*cp++ = c;					/* c is the given "peek" char */
+	*cp++ = my_getc(0);			/* get next char of input */
+	*cp = 0;					/* add EOS marker */
+
+	c = rlookup(s);				/* see if 2 chars form a shell multiline */
+	if (c == 0)
+		unget(*--cp);			/* String is not a shell multiline, put peek char back */
+
+	return (c);					/* String is multiline, return numeric multiline (restab) code */
 }
 
 static void diag(ec)
-register int ec;
+REGISTER int ec;
 {
-	register int c;
+	REGISTER int c;
+
+	DBGPRINTF8(("DIAG: enter, ec=%d\n", ec));
 
 	c = my_getc(0);
 	if (c == '>' || c == '<') {
@@ -2204,9 +2591,10 @@ register int ec;
 static char *tree(size)
 unsigned size;
 {
-	register char *t;
+	REGISTER char *t;
 
 	if ((t = getcell(size)) == NULL) {
+		DBGPRINTF2(("TREE: getcell(%d) failed!\n", size));
 		prs("command line too complicated\n");
 		fail();
 		/* NOTREACHED */
@@ -2225,14 +2613,15 @@ unsigned size;
 
 
 static int execute(t, pin, pout, act)
-register struct op *t;
+REGISTER struct op *t;
 int *pin, *pout;
 int act;
 {
-	register struct op *t1;
+	REGISTER struct op *t1;
 	volatile int i, rv, a;
 	char *cp, **wp, **wp2;
 	struct var *vp;
+	struct op *outtree_save;
 	struct brkcon bc;
 
 #if __GNUC__
@@ -2240,29 +2629,59 @@ int act;
 	(void) &wp;
 #endif
 
-
-	if (t == NULL)
+	if (t == NULL) {
+		DBGPRINTF4(("EXECUTE: enter, t==null, returning.\n"));
 		return (0);
+	}
+
+	DBGPRINTF(("EXECUTE: t=0x%x, t->type=%d (%s), t->words is %s\n", t,
+			   t->type, T_CMD_NAMES[t->type],
+			   ((t->words == NULL) ? "NULL" : t->words[0])));
+
 	rv = 0;
 	a = areanum++;
 	wp = (wp2 = t->words) != NULL
 		? eval(wp2, t->type == TCOM ? DOALL : DOALL & ~DOKEY)
 		: NULL;
 
+/* Hard to know how many words there are, be careful of garbage pointer values */
+/* They are likely to cause "PCI bus fault" errors */
+#if 0
+	DBGPRINTF(("EXECUTE: t->left=0x%x, t->right=0x%x, t->words[1] is %s\n",
+			   t->left, t->right,
+			   ((t->words[1] == NULL) ? "NULL" : t->words[1])));
+	DBGPRINTF7(("EXECUTE: t->words[2] is %s, t->words[3] is %s\n",
+				((t->words[2] == NULL) ? "NULL" : t->words[2]),
+				((t->words[3] == NULL) ? "NULL" : t->words[3])));
+#endif
+
+
 	switch (t->type) {
+	case TDOT:
+		DBGPRINTF3(("EXECUTE: TDOT\n"));
+
+		outtree_save = outtree;
+
+		newfile(evalstr(t->words[0], DOALL));
+
+		t->left = dowholefile(TLIST, 0);
+		t->right = NULL;
+
+		outtree = outtree_save;
+
+		if (t->left)
+			rv = execute(t->left, pin, pout, 0);
+		if (t->right)
+			rv = execute(t->right, pin, pout, 0);
+		break;
+
 	case TPAREN:
 		rv = execute(t->left, pin, pout, 0);
 		break;
 
 	case TCOM:
 		{
-			int child;
-
-			rv = forkexec(t, pin, pout, act, wp, &child);
-			if (child) {
-				exstat = rv;
-				leave();
-			}
+			rv = forkexec(t, pin, pout, act, wp);
 		}
 		break;
 
@@ -2288,6 +2707,8 @@ int act;
 		{
 			int hinteractive = interactive;
 
+			DBGPRINTF7(("EXECUTE: TASYNC clause, calling vfork()...\n"));
+
 			i = vfork();
 			if (i != 0) {
 				interactive = hinteractive;
@@ -2312,7 +2733,7 @@ int act;
 					close(0);
 					open("/dev/null", 0);
 				}
-				exit(execute(t->left, pin, pout, FEXEC));
+				_exit(execute(t->left, pin, pout, FEXEC));
 			}
 		}
 		break;
@@ -2369,8 +2790,16 @@ int act;
 	case TCASE:
 		if ((cp = evalstr(t->str, DOSUB | DOTRIM)) == 0)
 			cp = "";
-		if ((t1 = findcase(t->left, cp)) != NULL)
+
+		DBGPRINTF7(("EXECUTE: TCASE, t->str is %s, cp is %s\n",
+					((t->str == NULL) ? "NULL" : t->str),
+					((cp == NULL) ? "NULL" : cp)));
+
+		if ((t1 = findcase(t->left, cp)) != NULL) {
+			DBGPRINTF7(("EXECUTE: TCASE, calling execute(t=0x%x, t1=0x%x)...\n", t, t1));
 			rv = execute(t1, pin, pout, 0);
+			DBGPRINTF7(("EXECUTE: TCASE, back from execute(t=0x%x, t1=0x%x)...\n", t, t1));
+		}
 		break;
 
 	case TBRACE:
@@ -2385,7 +2814,8 @@ int act;
 		if (rv >= 0 && (t1 = t->left))
 			rv = execute(t1, pin, pout, 0);
 		break;
-	}
+
+	};
 
   broken:
 	t->words = wp2;
@@ -2397,28 +2827,31 @@ int act;
 		closeall();
 		fail();
 	}
+
 	if ((i = trapset) != 0) {
 		trapset = 0;
 		runtrap(i);
 	}
+
+	DBGPRINTF(("EXECUTE: returning from t=0x%x, rv=%d\n", t, rv));
 	return (rv);
 }
 
 static int
-forkexec(register struct op *t, int *pin, int *pout, int act, char **wp,
-		 int *pforked)
+forkexec(REGISTER struct op *t, int *pin, int *pout, int act, char **wp)
 {
+	pid_t newpid;
 	int i, rv;
 	int (*shcom) (struct op *) = NULL;
-	register int f;
+	REGISTER int f;
 	char *cp = NULL;
 	struct ioword **iopp;
 	int resetsig;
 	char **owp;
+	int forked = 0;
 
 	int *hpin = pin;
 	int *hpout = pout;
-	int hforked;
 	char *hwp;
 	int hinteractive;
 	int hintr;
@@ -2436,9 +2869,28 @@ forkexec(register struct op *t, int *pin, int *pout, int act, char **wp,
 	(void) &owp;
 #endif
 
+	DBGPRINTF(("FORKEXEC: t=0x%x, pin 0x%x, pout 0x%x, act %d\n", t, pin,
+			   pout, act));
+	DBGPRINTF7(("FORKEXEC: t->words is %s\n",
+				((t->words == NULL) ? "NULL" : t->words[0])));
+
+/* Hard to know how many words there are, be careful of garbage pointer values */
+/* They are likely to cause "PCI bus fault" errors */
+#if 0
+	DBGPRINTF7(("FORKEXEC: t->words is %s, t->words[1] is %s\n",
+				((t->words == NULL) ? "NULL" : t->words[0]),
+				((t->words == NULL) ? "NULL" : t->words[1])));
+	DBGPRINTF7(("FORKEXEC: wp is %s, wp[1] is %s\n",
+				((wp == NULL) ? "NULL" : wp[0]),
+				((wp[1] == NULL) ? "NULL" : wp[1])));
+	DBGPRINTF7(("FORKEXEC: wp2 is %s, wp[3] is %s\n",
+				((wp[2] == NULL) ? "NULL" : wp[2]),
+				((wp[3] == NULL) ? "NULL" : wp[3])));
+#endif
+
+
 	owp = wp;
 	resetsig = 0;
-	*pforked = 0;
 	rv = -1;					/* system-detected error */
 	if (t->type == TCOM) {
 		while ((cp = *wp++) != NULL);
@@ -2446,47 +2898,85 @@ forkexec(register struct op *t, int *pin, int *pout, int act, char **wp,
 
 		/* strip all initial assignments */
 		/* not correct wrt PATH=yyy command  etc */
-		if (flag['x'])
+		if (flag['x']) {
+			DBGPRINTF9(("FORKEXEC: echo'ing, cp=0x%x, wp=0x%x, owp=0x%x\n",
+						cp, wp, owp));
 			echo(cp ? wp : owp);
+		}
+#if 0
+		DBGPRINTF9(("FORKEXEC: t->words is %s, t->words[1] is %s\n",
+					((t->words == NULL) ? "NULL" : t->words[0]),
+					((t->words == NULL) ? "NULL" : t->words[1])));
+		DBGPRINTF9(("FORKEXEC: wp is %s, wp[1] is %s\n",
+					((wp == NULL) ? "NULL" : wp[0]),
+					((wp == NULL) ? "NULL" : wp[1])));
+#endif
+
 		if (cp == NULL && t->ioact == NULL) {
 			while ((cp = *owp++) != NULL && assign(cp, COPYV));
+			DBGPRINTF(("FORKEXEC: returning setstatus()\n"));
 			return (setstatus(0));
-		} else if (cp != NULL)
+		} else if (cp != NULL) {
 			shcom = inbuilt(cp);
+		}
 	}
+
 	t->words = wp;
 	f = act;
-	if (shcom == NULL && (f & FEXEC) == 0) {
 
+#if 0
+	DBGPRINTF3(("FORKEXEC: t->words is %s, t->words[1] is %s\n",
+				((t->words == NULL) ? "NULL" : t->words[0]),
+				((t->words == NULL) ? "NULL" : t->words[1])));
+#endif
+	DBGPRINTF(("FORKEXEC: shcom 0x%x, f&FEXEC 0x%x, owp 0x%x\n", shcom,
+			   f & FEXEC, owp));
+
+	if (shcom == NULL && (f & FEXEC) == 0) {
+		/* Save values in case the child process alters them */
 		hpin = pin;
 		hpout = pout;
-		hforked = *pforked;
 		hwp = *wp;
 		hinteractive = interactive;
 		hintr = intr;
 		hbrklist = brklist;
 		hexecflg = execflg;
 
-		i = vfork();
-		if (i != 0) {
-			/* who wrote this crappy non vfork safe shit? */
+		DBGPRINTF3(("FORKEXEC: calling vfork()...\n"));
+
+		newpid = vfork();
+
+		if (newpid == -1) {
+			DBGPRINTF(("FORKEXEC: ERROR, unable to vfork()!\n"));
+			return (-1);
+		}
+
+
+		if (newpid > 0) {		/* Parent */
+
+			/* Restore values */
 			pin = hpin;
 			pout = hpout;
-			*pforked = hforked;
 			*wp = hwp;
 			interactive = hinteractive;
 			intr = hintr;
 			brklist = hbrklist;
 			execflg = hexecflg;
 
-			*pforked = 0;
+/* moved up
 			if (i == -1)
-				return (rv);
+				return(rv);
+*/
+
 			if (pin != NULL)
 				closepipe(pin);
-			return (pout == NULL ? setstatus(waitfor(i, 0)) : 0);
+
+			return (pout == NULL ? setstatus(waitfor(newpid, 0)) : 0);
 		}
 
+		/* Must be the child process, pid should be 0 */
+		DBGPRINTF(("FORKEXEC: child process, shcom=0x%x\n", shcom));
+
 		if (interactive) {
 			signal(SIGINT, SIG_IGN);
 			signal(SIGQUIT, SIG_IGN);
@@ -2494,20 +2984,26 @@ forkexec(register struct op *t, int *pin, int *pout, int act, char **wp,
 		}
 		interactive = 0;
 		intr = 0;
-		(*pforked)++;
+		forked = 1;
 		brklist = 0;
 		execflg = 0;
 	}
+
+
 	if (owp != NULL)
 		while ((cp = *owp++) != NULL && assign(cp, COPYV))
 			if (shcom == NULL)
 				export(lookup(cp));
+
 #ifdef COMPIPE
 	if ((pin != NULL || pout != NULL) && shcom != NULL && shcom != doexec) {
 		err("piping to/from shell builtins not yet done");
+		if (forked)
+			_exit(-1);
 		return (-1);
 	}
 #endif
+
 	if (pin != NULL) {
 		dup2(pin[0], 0);
 		closepipe(pin);
@@ -2516,18 +3012,31 @@ forkexec(register struct op *t, int *pin, int *pout, int act, char **wp,
 		dup2(pout[1], 1);
 		closepipe(pout);
 	}
+
 	if ((iopp = t->ioact) != NULL) {
 		if (shcom != NULL && shcom != doexec) {
 			prs(cp);
 			err(": cannot redirect shell command");
+			if (forked)
+				_exit(-1);
 			return (-1);
 		}
 		while (*iopp)
-			if (iosetup(*iopp++, pin != NULL, pout != NULL))
+			if (iosetup(*iopp++, pin != NULL, pout != NULL)) {
+				if (forked)
+					_exit(rv);
 				return (rv);
+			}
+	}
+
+	if (shcom) {
+		i = setstatus((*shcom) (t));
+		if (forked)
+			_exit(i);
+		DBGPRINTF(("FORKEXEC: returning i=%d\n", i));
+		return (i);
 	}
-	if (shcom)
-		return (setstatus((*shcom) (t)));
+
 	/* should use FIOCEXCL */
 	for (i = FDBASE; i < NOFILE; i++)
 		close(i);
@@ -2535,20 +3044,24 @@ forkexec(register struct op *t, int *pin, int *pout, int act, char **wp,
 		signal(SIGINT, SIG_DFL);
 		signal(SIGQUIT, SIG_DFL);
 	}
+
 	if (t->type == TPAREN)
-		exit(execute(t->left, NOPIPE, NOPIPE, FEXEC));
+		_exit(execute(t->left, NOPIPE, NOPIPE, FEXEC));
 	if (wp[0] == NULL)
-		exit(0);
+		_exit(0);
 
-	cp = rexecve(wp[0], wp, makenv());
+	cp = rexecve(wp[0], wp, makenv(0));
 	prs(wp[0]);
 	prs(": ");
-	warn(cp);
+	err(cp);
 	if (!execflg)
 		trap[0] = NULL;
+
+	DBGPRINTF(("FORKEXEC: calling leave(), pid=%d\n", newpid));
+
 	leave();
 	/* NOTREACHED */
-	exit(1);
+	_exit(1);
 }
 
 /*
@@ -2556,24 +3069,31 @@ forkexec(register struct op *t, int *pin, int *pout, int act, char **wp,
  * within pipelines.
  */
 static int iosetup(iop, pipein, pipeout)
-register struct ioword *iop;
+REGISTER struct ioword *iop;
 int pipein, pipeout;
 {
-	register int u = -1;
+	REGISTER int u = -1;
 	char *cp = NULL, *msg;
 
+	DBGPRINTF(("IOSETUP: iop 0x%x, pipein 0x%x, pipeout 0x%x\n", iop,
+			   pipein, pipeout));
+
 	if (iop->io_unit == IODEFAULT)	/* take default */
 		iop->io_unit = iop->io_flag & (IOREAD | IOHERE) ? 0 : 1;
+
 	if (pipein && iop->io_unit == 0)
 		return (0);
+
 	if (pipeout && iop->io_unit == 1)
 		return (0);
+
 	msg = iop->io_flag & (IOREAD | IOHERE) ? "open" : "create";
 	if ((iop->io_flag & IOHERE) == 0) {
 		cp = iop->io_name;
 		if ((cp = evalstr(cp, DOSUB | DOTRIM)) == NULL)
 			return (1);
 	}
+
 	if (iop->io_flag & IODUP) {
 		if (cp[1] || (!isdigit(*cp) && *cp != '-')) {
 			prs(cp);
@@ -2627,9 +3147,9 @@ int pipein, pipeout;
 }
 
 static void echo(wp)
-register char **wp;
+REGISTER char **wp;
 {
-	register int i;
+	REGISTER int i;
 
 	prs("+");
 	for (i = 0; wp[i]; i++) {
@@ -2644,21 +3164,36 @@ static struct op **find1case(t, w)
 struct op *t;
 char *w;
 {
-	register struct op *t1;
+	REGISTER struct op *t1;
 	struct op **tp;
-	register char **wp, *cp;
+	REGISTER char **wp, *cp;
+
 
-	if (t == NULL)
+	if (t == NULL) {
+		DBGPRINTF3(("FIND1CASE: enter, t==NULL, returning.\n"));
 		return ((struct op **) NULL);
+	}
+
+	DBGPRINTF3(("FIND1CASE: enter, t->type=%d (%s)\n", t->type,
+				T_CMD_NAMES[t->type]));
+
 	if (t->type == TLIST) {
-		if ((tp = find1case(t->left, w)) != NULL)
+		if ((tp = find1case(t->left, w)) != NULL) {
+			DBGPRINTF3(("FIND1CASE: found one to the left, returning tp=0x%x\n", tp));
 			return (tp);
+		}
 		t1 = t->right;			/* TPAT */
 	} else
 		t1 = t;
+
 	for (wp = t1->words; *wp;)
-		if ((cp = evalstr(*wp++, DOSUB)) && gmatch(w, cp))
+		if ((cp = evalstr(*wp++, DOSUB)) && gmatch(w, cp)) {
+			DBGPRINTF3(("FIND1CASE: returning &t1->left= 0x%x.\n",
+						&t1->left));
 			return (&t1->left);
+		}
+
+	DBGPRINTF(("FIND1CASE: returning NULL\n"));
 	return ((struct op **) NULL);
 }
 
@@ -2666,7 +3201,7 @@ static struct op *findcase(t, w)
 struct op *t;
 char *w;
 {
-	register struct op **tp;
+	REGISTER struct op **tp;
 
 	return ((tp = find1case(t, w)) != NULL ? *tp : (struct op *) NULL);
 }
@@ -2689,10 +3224,10 @@ struct brkcon *bc;
  * unless `canintr' is true.
  */
 static int waitfor(lastpid, canintr)
-register int lastpid;
+REGISTER int lastpid;
 int canintr;
 {
-	register int pid, rv;
+	REGISTER int pid, rv;
 	int s;
 	int oheedint = heedint;
 
@@ -2746,7 +3281,7 @@ int canintr;
 }
 
 static int setstatus(s)
-register int s;
+REGISTER int s;
 {
 	exstat = s;
 	setval(lookup("?"), putn(s));
@@ -2761,8 +3296,8 @@ register int s;
 static char *rexecve(c, v, envp)
 char *c, **v, **envp;
 {
-	register int i;
-	register char *sp, *tp;
+	REGISTER int i;
+	REGISTER char *sp, *tp;
 	int eacces = 0, asis = 0;
 
 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
@@ -2778,6 +3313,8 @@ char *c, **v, **envp;
 	}
 #endif
 
+	DBGPRINTF(("REXECVE: c=0x%x, v=0x%x, envp=0x%x\n", c, v, envp));
+
 	sp = any('/', c) ? "" : path->value;
 	asis = *sp == '\0';
 	while (asis || *sp != '\0') {
@@ -2792,7 +3329,10 @@ char *c, **v, **envp;
 			*tp++ = '/';
 		for (i = 0; (*tp++ = c[i++]) != '\0';);
 
+		DBGPRINTF3(("REXECVE: e.linep is %s\n", e.linep));
+
 		execve(e.linep, v, envp);
+
 		switch (errno) {
 		case ENOEXEC:
 			*v = e.linep;
@@ -2834,12 +3374,16 @@ static int run(struct ioarg *argp, int (*f) (struct ioarg *))
 	(void) &rv;
 #endif
 
+	DBGPRINTF(("RUN: enter, areanum %d, outtree 0x%x, failpt 0x%x\n",
+			   areanum, outtree, failpt));
+
 	areanum++;
 	swdlist = wdlist;
 	siolist = iolist;
 	otree = outtree;
 	ofail = failpt;
 	rv = -1;
+
 	if (newenv(setjmp(errpt = ev)) == 0) {
 		wdlist = 0;
 		iolist = 0;
@@ -2849,12 +3393,16 @@ static int run(struct ioarg *argp, int (*f) (struct ioarg *))
 		if (setjmp(failpt = rt) == 0 && yyparse() == 0)
 			rv = execute(outtree, NOPIPE, NOPIPE, 0);
 		quitenv();
+	} else {
+		DBGPRINTF(("RUN: error from newenv()!\n"));
 	}
+
 	wdlist = swdlist;
 	iolist = siolist;
 	failpt = ofail;
 	outtree = otree;
 	freearea(areanum--);
+
 	return (rv);
 }
 
@@ -2912,9 +3460,9 @@ static int dolabel(struct op *t)
 }
 
 static int dochdir(t)
-register struct op *t;
+REGISTER struct op *t;
 {
-	register char *cp, *er;
+	REGISTER char *cp, *er;
 
 	if ((cp = t->words[1]) == NULL && (cp = homedir->value) == NULL)
 		er = ": no home directory";
@@ -2928,9 +3476,9 @@ register struct op *t;
 }
 
 static int doshift(t)
-register struct op *t;
+REGISTER struct op *t;
 {
-	register int n;
+	REGISTER int n;
 
 	n = t->words[1] ? getn(t->words[1]) : 1;
 	if (dolc < n) {
@@ -2950,13 +3498,13 @@ register struct op *t;
 static int dologin(t)
 struct op *t;
 {
-	register char *cp;
+	REGISTER char *cp;
 
 	if (interactive) {
 		signal(SIGINT, SIG_DFL);
 		signal(SIGQUIT, SIG_DFL);
 	}
-	cp = rexecve(t->words[0], t->words, makenv());
+	cp = rexecve(t->words[0], t->words, makenv(0));
 	prs(t->words[0]);
 	prs(": ");
 	err(cp);
@@ -2964,10 +3512,10 @@ struct op *t;
 }
 
 static int doumask(t)
-register struct op *t;
+REGISTER struct op *t;
 {
-	register int i, n;
-	register char *cp;
+	REGISTER int i, n;
+	REGISTER char *cp;
 
 	if ((cp = t->words[1]) == NULL) {
 		i = umask(0);
@@ -2984,9 +3532,9 @@ register struct op *t;
 }
 
 static int doexec(t)
-register struct op *t;
+REGISTER struct op *t;
 {
-	register int i;
+	REGISTER int i;
 	jmp_buf ex;
 	xint *ofail;
 
@@ -3006,36 +3554,61 @@ register struct op *t;
 static int dodot(t)
 struct op *t;
 {
-	register int i;
-	register char *sp, *tp;
+	REGISTER int i;
+	REGISTER char *sp, *tp;
 	char *cp;
+	int maltmp;
 
-	if ((cp = t->words[1]) == NULL)
+	DBGPRINTF(("DODOT: enter, t=0x%x, tleft 0x%x, tright 0x%x, e.linep is %s\n", t, t->left, t->right, ((e.linep == NULL) ? "NULL" : e.linep)));
+
+	if ((cp = t->words[1]) == NULL) {
+		DBGPRINTF(("DODOT: bad args, ret 0\n"));
 		return (0);
+	} else {
+		DBGPRINTF(("DODOT: cp is %s\n", cp));
+	}
+
 	sp = any('/', cp) ? ":" : path->value;
+
+	DBGPRINTF(("DODOT: sp is %s,  e.linep is %s\n",
+			   ((sp == NULL) ? "NULL" : sp),
+			   ((e.linep == NULL) ? "NULL" : e.linep)));
+
 	while (*sp) {
 		tp = e.linep;
 		while (*sp && (*tp = *sp++) != ':')
 			tp++;
 		if (tp != e.linep)
 			*tp++ = '/';
+
 		for (i = 0; (*tp++ = cp[i++]) != '\0';);
+
+		/* Original code */
 		if ((i = open(e.linep, 0)) >= 0) {
 			exstat = 0;
-			next(remap(i));
+			maltmp = remap(i);
+			DBGPRINTF(("DODOT: remap=%d, exstat=%d, e.iofd %d, i %d, e.linep is %s\n", maltmp, exstat, e.iofd, i, e.linep));
+
+			next(maltmp);		/* Basically a PUSHIO */
+
+			DBGPRINTF(("DODOT: returning exstat=%d\n", exstat));
+
 			return (exstat);
 		}
-	}
+
+	}							/* While */
+
 	prs(cp);
 	err(": not found");
+
 	return (-1);
 }
 
 static int dowait(t)
 struct op *t;
 {
-	register int i;
-	register char *cp;
+	REGISTER int i;
+	REGISTER char *cp;
 
 	if ((cp = t->words[1]) != NULL) {
 		i = getn(cp);
@@ -3050,9 +3623,9 @@ struct op *t;
 static int doread(t)
 struct op *t;
 {
-	register char *cp, **wp;
-	register int nb = 0;
-	register int nl = 0;
+	REGISTER char *cp, **wp;
+	REGISTER int nb = 0;
+	REGISTER int nl = 0;
 
 	if (t->words[1] == NULL) {
 		err("Usage: read name ...");
@@ -3072,16 +3645,16 @@ struct op *t;
 }
 
 static int doeval(t)
-register struct op *t;
+REGISTER struct op *t;
 {
 	return (RUN(awordlist, t->words + 1, wdchar));
 }
 
 static int dotrap(t)
-register struct op *t;
+REGISTER struct op *t;
 {
-	register int n, i;
-	register int resetsig;
+	REGISTER int n, i;
+	REGISTER int resetsig;
 
 	if (t->words[1] == NULL) {
 		for (i = 0; i <= _NSIG; i++)
@@ -3120,7 +3693,7 @@ register struct op *t;
 static int getsig(s)
 char *s;
 {
-	register int n;
+	REGISTER int n;
 
 	if ((n = getn(s)) < 0 || n > _NSIG) {
 		err("trap: bad signal number");
@@ -3129,7 +3702,7 @@ char *s;
 	return (n);
 }
 
-static void setsig(register int n, sighandler_t f)
+static void setsig(REGISTER int n, sighandler_t f)
 {
 	if (n == 0)
 		return;
@@ -3142,8 +3715,8 @@ static void setsig(register int n, sighandler_t f)
 static int getn(as)
 char *as;
 {
-	register char *s;
-	register int n, m;
+	REGISTER char *s;
+	REGISTER int n, m;
 
 	s = as;
 	m = 1;
@@ -3173,11 +3746,11 @@ struct op *t;
 }
 
 static int brkcontin(cp, val)
-register char *cp;
+REGISTER char *cp;
 int val;
 {
-	register struct brkcon *bc;
-	register int nl;
+	REGISTER struct brkcon *bc;
+	REGISTER int nl;
 
 	nl = cp == NULL ? 1 : getn(cp);
 	if (nl <= 0)
@@ -3199,11 +3772,14 @@ int val;
 static int doexit(t)
 struct op *t;
 {
-	register char *cp;
+	REGISTER char *cp;
 
 	execflg = 0;
 	if ((cp = t->words[1]) != NULL)
 		setstatus(getn(cp));
+
+	DBGPRINTF(("DOEXIT: calling leave(), t=0x%x\n", t));
+
 	leave();
 	/* NOTREACHED */
 	return (0);
@@ -3225,6 +3801,9 @@ struct op *t;
 
 static void rdexp(char **wp, void (*f) (struct var *), int key)
 {
+	DBGPRINTF6(("RDEXP: enter, wp=0x%x, func=0x%x, key=%d\n", wp, f, key));
+	DBGPRINTF6(("RDEXP: *wp=%s\n", *wp));
+
 	if (*wp != NULL) {
 		for (; *wp != NULL; wp++) {
 			if (isassign(*wp)) {
@@ -3244,18 +3823,18 @@ static void rdexp(char **wp, void (*f) (struct var *), int key)
 }
 
 static void badid(s)
-register char *s;
+REGISTER char *s;
 {
 	prs(s);
 	err(": bad identifier");
 }
 
 static int doset(t)
-register struct op *t;
+REGISTER struct op *t;
 {
-	register struct var *vp;
-	register char *cp;
-	register int n;
+	REGISTER struct var *vp;
+	REGISTER char *cp;
+	REGISTER int n;
 
 	if ((cp = t->words[1]) == NULL) {
 		for (vp = vlist; vp; vp = vp->next)
@@ -3295,7 +3874,7 @@ register struct op *t;
 }
 
 static void varput(s, out)
-register char *s;
+REGISTER char *s;
 int out;
 {
 	if (isalnum(*s) || *s == '_') {
@@ -3360,6 +3939,9 @@ static char **eval(char **ap, int f)
 	(void) &wp;
 	(void) &ap;
 #endif
+
+	DBGPRINTF4(("EVAL: enter, f=%d\n", f));
+
 	wp = NULL;
 	wb = NULL;
 	wf = NULL;
@@ -3381,6 +3963,7 @@ static char **eval(char **ap, int f)
 		quitenv();
 	} else
 		gflg = 1;
+
 	return (gflg ? (char **) NULL : wp);
 }
 
@@ -3389,25 +3972,29 @@ static char **eval(char **ap, int f)
  * names in the dictionary. Keyword assignments
  * will already have been done.
  */
-static char **makenv()
+static char **makenv(int all)
 {
-	register struct wdblock *wb;
-	register struct var *vp;
+	REGISTER struct wdblock *wb;
+	REGISTER struct var *vp;
+
+	DBGPRINTF5(("MAKENV: enter, all=%d\n", all));
 
 	wb = NULL;
 	for (vp = vlist; vp; vp = vp->next)
-		if (vp->status & EXPORT)
+		if (all || vp->status & EXPORT)
 			wb = addword(vp->name, wb);
 	wb = addword((char *) 0, wb);
 	return (getwords(wb));
 }
 
 static char *evalstr(cp, f)
-register char *cp;
+REGISTER char *cp;
 int f;
 {
 	struct wdblock *wb;
 
+	DBGPRINTF6(("EVALSTR: enter, cp=0x%x, f=%d\n", cp, f));
+
 	wb = NULL;
 	if (expand(cp, &wb, f)) {
 		if (wb == NULL || wb->w_nword == 0
@@ -3419,7 +4006,7 @@ int f;
 	return (cp);
 }
 
-static int expand(char *cp, register struct wdblock **wbp, int f)
+static int expand(char *cp, REGISTER struct wdblock **wbp, int f)
 {
 	jmp_buf ev;
 
@@ -3427,9 +4014,14 @@ static int expand(char *cp, register struct wdblock **wbp, int f)
 	/* Avoid longjmp clobbering */
 	(void) &cp;
 #endif
+
+	DBGPRINTF3(("EXPAND: enter, f=%d\n", f));
+
 	gflg = 0;
+
 	if (cp == NULL)
 		return (0);
+
 	if (!anys("$`'\"", cp) &&
 		!anys(ifs->value, cp) && ((f & DOGLOB) == 0 || !anys("[*?", cp))) {
 		cp = strsave(cp, areanum);
@@ -3463,10 +4055,12 @@ static int expand(char *cp, register struct wdblock **wbp, int f)
 static char *blank(f)
 int f;
 {
-	register int c, c1;
-	register char *sp;
+	REGISTER int c, c1;
+	REGISTER char *sp;
 	int scanequals, foundequals;
 
+	DBGPRINTF3(("BLANK: enter, f=%d\n", f));
+
 	sp = e.linep;
 	scanequals = f & DOKEY;
 	foundequals = 0;
@@ -3529,10 +4123,12 @@ int f;
  * Get characters, substituting for ` and $
  */
 static int subgetc(ec, quoted)
-register char ec;
+REGISTER char ec;
 int quoted;
 {
-	register char c;
+	REGISTER char c;
+
+	DBGPRINTF3(("SUBGETC: enter, quoted=%d\n", quoted));
 
   again:
 	c = my_getc(ec);
@@ -3560,9 +4156,11 @@ int quoted;
 	int otask;
 	struct io *oiop;
 	char *dolp;
-	register char *s, c, *cp = NULL;
+	REGISTER char *s, c, *cp = NULL;
 	struct var *vp;
 
+	DBGPRINTF3(("DOLLAR: enter, quoted=%d\n", quoted));
+
 	c = readc();
 	s = e.linep;
 	if (c != '{') {
@@ -3577,6 +4175,7 @@ int quoted;
 	} else {
 		oiop = e.iop;
 		otask = e.iop->task;
+
 		e.iop->task = XOTHER;
 		while ((c = subgetc('"', 0)) != 0 && c != '}' && c != '\n')
 			if (e.linep < elinep)
@@ -3660,7 +4259,7 @@ static int grave(quoted)
 int quoted;
 {
 	char *cp;
-	register int i;
+	REGISTER int i;
 	int j;
 	int pf[2];
 	static char child_cmd[LINELIM];
@@ -3769,7 +4368,11 @@ int quoted;
 
 	if (openpipe(pf) < 0)
 		return (0);
+
 	while ((i = vfork()) == -1 && errno == EAGAIN);
+
+	DBGPRINTF3(("GRAVE: i is %d\n", io));
+
 	if (i < 0) {
 		closepipe(pf);
 		err((char *) bb_msg_memory_exhausted);
@@ -3798,15 +4401,18 @@ int quoted;
 	argument_list[2] = child_cmd;
 	argument_list[3] = 0;
 
-	prs(rexecve(argument_list[0], argument_list, makenv()));
+	cp = rexecve(argument_list[0], argument_list, makenv(1));
+	prs(argument_list[0]);
+	prs(": ");
+	err(cp);
 	_exit(1);
 }
 
 
 static char *unquote(as)
-register char *as;
+REGISTER char *as;
 {
-	register char *s;
+	REGISTER char *s;
 
 	if ((s = as) != NULL)
 		while (*s)
@@ -3831,8 +4437,8 @@ static struct wdblock *glob(cp, wb)
 char *cp;
 struct wdblock *wb;
 {
-	register int i;
-	register char *pp;
+	REGISTER int i;
+	REGISTER char *pp;
 
 	if (cp == 0)
 		return (wb);
@@ -3875,9 +4481,9 @@ struct wdblock *wb;
 
 static void globname(we, pp)
 char *we;
-register char *pp;
+REGISTER char *pp;
 {
-	register char *np, *cp;
+	REGISTER char *np, *cp;
 	char *name, *gp, *dp;
 	int k;
 	DIR *dirp;
@@ -3938,11 +4544,11 @@ register char *pp;
  */
 static char *generate(start1, end1, middle, end)
 char *start1;
-register char *end1;
+REGISTER char *end1;
 char *middle, *end;
 {
 	char *p;
-	register char *op, *xp;
+	REGISTER char *op, *xp;
 
 	p = op =
 		space((int) (end1 - start1) + strlen(middle) + strlen(end) + 2);
@@ -3955,10 +4561,10 @@ char *middle, *end;
 }
 
 static int anyspcl(wb)
-register struct wdblock *wb;
+REGISTER struct wdblock *wb;
 {
-	register int i;
-	register char **wd;
+	REGISTER int i;
+	REGISTER char **wd;
 
 	wd = wb->w_words;
 	for (i = 0; i < wb->w_nword; i++)
@@ -3976,9 +4582,9 @@ char *p1, *p2;
 /* -------- word.c -------- */
 
 static struct wdblock *newword(nw)
-register int nw;
+REGISTER int nw;
 {
-	register struct wdblock *wb;
+	REGISTER struct wdblock *wb;
 
 	wb = (struct wdblock *) space(sizeof(*wb) + nw * sizeof(char *));
 	wb->w_bsize = nw;
@@ -3988,10 +4594,10 @@ register int nw;
 
 static struct wdblock *addword(wd, wb)
 char *wd;
-register struct wdblock *wb;
+REGISTER struct wdblock *wb;
 {
-	register struct wdblock *wb2;
-	register int nw;
+	REGISTER struct wdblock *wb2;
+	REGISTER int nw;
 
 	if (wb == NULL)
 		wb = newword(NSTART);
@@ -4009,10 +4615,10 @@ register struct wdblock *wb;
 
 static
 char **getwords(wb)
-register struct wdblock *wb;
+REGISTER struct wdblock *wb;
 {
-	register char **wd;
-	register int nb;
+	REGISTER char **wd;
+	REGISTER int nb;
 
 	if (wb == NULL)
 		return ((char **) NULL);
@@ -4043,7 +4649,7 @@ int (*a3) (char *, char *);
 static void glob1(base, lim)
 char *base, *lim;
 {
-	register char *i, *j;
+	REGISTER char *i, *j;
 	int v2;
 	char *lptr, *hptr;
 	int c;
@@ -4113,7 +4719,7 @@ char *base, *lim;
 static void glob2(i, j)
 char *i, *j;
 {
-	register char *index1, *index2, c;
+	REGISTER char *index1, *index2, c;
 	int m;
 
 	m = globv;
@@ -4129,7 +4735,7 @@ char *i, *j;
 static void glob3(i, j, k)
 char *i, *j, *k;
 {
-	register char *index1, *index2, *index3;
+	REGISTER char *index1, *index2, *index3;
 	int c;
 	int m;
 
@@ -4153,7 +4759,7 @@ char *i, *j, *k;
 
 static int my_getc(int ec)
 {
-	register int c;
+	REGISTER int c;
 
 	if (e.linep > elinep) {
 		while ((c = readc()) != '\n' && c);
@@ -4187,9 +4793,12 @@ static int eofc()
 
 static int readc()
 {
-	register int c;
+	REGISTER int c;
 
-	for (; e.iop >= e.iobase; e.iop--)
+	RCPRINTF(("READC: e.iop 0x%x, e.iobase 0x%x\n", e.iop, e.iobase));
+
+	for (; e.iop >= e.iobase; e.iop--) {
+		RCPRINTF(("READC: e.iop 0x%x, peekc 0x%x\n", e.iop, e.iop->peekc));
 		if ((c = e.iop->peekc) != '\0') {
 			e.iop->peekc = 0;
 			return (c);
@@ -4211,8 +4820,9 @@ static int readc()
 				}
 			}
 			if (e.iop->task == XIO) {
-				if (multiline)
+				if (multiline) {
 					return e.iop->prev = 0;
+				}
 				if (interactive && e.iop == iostack + 1) {
 #ifdef CONFIG_FEATURE_COMMAND_EDITING
 					current_prompt = prompt->value;
@@ -4222,9 +4832,17 @@ static int readc()
 				}
 			}
 		}
-	if (e.iop >= iostack)
+
+	}							/* FOR */
+
+	if (e.iop >= iostack) {
+		RCPRINTF(("READC: return 0, e.iop 0x%x\n", e.iop));
 		return (0);
+	}
+
+	DBGPRINTF(("READC: leave()...\n"));
 	leave();
+
 	/* NOTREACHED */
 	return (0);
 }
@@ -4236,35 +4854,61 @@ char c;
 		write(2, &c, sizeof c);
 }
 
+
 static void pushio(struct ioarg *argp, int (*fn) (struct ioarg *))
 {
+	DBGPRINTF(("PUSHIO: argp 0x%x, argp->afid 0x%x, e.iop 0x%x\n", argp,
+			   argp->afid, e.iop));
+
+	/* Set env ptr for io source to next array spot and check for array overflow */
 	if (++e.iop >= &iostack[NPUSH]) {
 		e.iop--;
 		err("Shell input nested too deeply");
 		gflg++;
 		return;
 	}
-	e.iop->iofn = (int (*)(struct ioarg *, struct io *)) fn;
+
+	/* We did not overflow the NPUSH array spots so setup data structs */
+
+	e.iop->iofn = (int (*)(struct ioarg *, struct io *)) fn;	/* Store data source func ptr */
 
 	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->argp = ioargstack + (e.iop - iostack);	/* MAL - index into stack */
+		*e.iop->argp = *argp;	/* copy data from temp area into stack spot */
+
+		/* MAL - mainbuf is for 1st data source (command line?) and all nested use a single shared buffer? */
+
+		if (e.iop == &iostack[0])
+			e.iop->argp->afbuf = &mainbuf;
+		else
+			e.iop->argp->afbuf = &sharedbuf;
+
+		/* MAL - if not a termimal AND (commandline OR readable file) then give it a buffer id? */
+		/* This line appears to be active when running scripts from command line */
+		if ((isatty(e.iop->argp->afile) == 0)
+			&& (e.iop == &iostack[0]
+				|| lseek(e.iop->argp->afile, 0L, 1) != -1)) {
+			if (++bufid == AFID_NOBUF)	/* counter rollover check, AFID_NOBUF = 11111111  */
+				bufid = AFID_ID;	/* AFID_ID = 0 */
+
+			e.iop->argp->afid = bufid;	/* assign buffer id */
 		}
+
+		DBGPRINTF(("PUSHIO: iostack 0x%x,  e.iop 0x%x, afbuf 0x%x\n",
+				   iostack, e.iop, e.iop->argp->afbuf));
+		DBGPRINTF(("PUSHIO: mbuf 0x%x, sbuf 0x%x, bid %d, e.iop 0x%x\n",
+				   &mainbuf, &sharedbuf, bufid, e.iop));
+
 	}
 
 	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 == (int (*)(struct ioarg *)) gravechar
@@ -4272,12 +4916,14 @@ static void pushio(struct ioarg *argp, int (*fn) (struct ioarg *))
 		e.iop->task = XGRAVE;
 	else
 		e.iop->task = XOTHER;
+
+	return;
 }
 
 static struct io *setbase(ip)
 struct io *ip;
 {
-	register struct io *xp;
+	REGISTER struct io *xp;
 
 	xp = e.iobase;
 	e.iobase = ip;
@@ -4292,9 +4938,9 @@ struct io *ip;
  * Produce the characters of a string, then a newline, then EOF.
  */
 static int nlchar(ap)
-register struct ioarg *ap;
+REGISTER struct ioarg *ap;
 {
-	register int c;
+	REGISTER int c;
 
 	if (ap->aword == NULL)
 		return (0);
@@ -4310,10 +4956,10 @@ register struct ioarg *ap;
  * in them, with a space after each word.
  */
 static int wdchar(ap)
-register struct ioarg *ap;
+REGISTER struct ioarg *ap;
 {
-	register char c;
-	register char **wl;
+	REGISTER char c;
+	REGISTER char **wl;
 
 	if ((wl = ap->awordlist) == NULL)
 		return (0);
@@ -4332,9 +4978,9 @@ register struct ioarg *ap;
  * producing a space between them.
  */
 static int dolchar(ap)
-register struct ioarg *ap;
+REGISTER struct ioarg *ap;
 {
-	register char *wp;
+	REGISTER char *wp;
 
 	if ((wp = *ap->awordlist++) != NULL) {
 		PUSHIO(aword, wp, *ap->awordlist == NULL ? strchar : xxchar);
@@ -4344,9 +4990,9 @@ register struct ioarg *ap;
 }
 
 static int xxchar(ap)
-register struct ioarg *ap;
+REGISTER struct ioarg *ap;
 {
-	register int c;
+	REGISTER int c;
 
 	if (ap->aword == NULL)
 		return (0);
@@ -4361,9 +5007,9 @@ register struct ioarg *ap;
  * Produce the characters from a single word (string).
  */
 static int strchar(ap)
-register struct ioarg *ap;
+REGISTER struct ioarg *ap;
 {
-	register int c;
+	REGISTER int c;
 
 	if (ap->aword == NULL || (c = *ap->aword++) == 0)
 		return (0);
@@ -4374,9 +5020,9 @@ register struct ioarg *ap;
  * Produce quoted characters from a single word (string).
  */
 static int qstrchar(ap)
-register struct ioarg *ap;
+REGISTER struct ioarg *ap;
 {
-	register int c;
+	REGISTER int c;
 
 	if (ap->aword == NULL || (c = *ap->aword++) == 0)
 		return (0);
@@ -4387,24 +5033,29 @@ register struct ioarg *ap;
  * Return the characters from a file.
  */
 static int filechar(ap)
-register struct ioarg *ap;
+REGISTER struct ioarg *ap;
 {
-	register int i;
+	REGISTER int i;
 	char c;
 	struct iobuf *bp = ap->afbuf;
 
 	if (ap->afid != AFID_NOBUF) {
 		if ((i = ap->afid != bp->id) || bp->bufp == bp->ebufp) {
+
 			if (i)
 				lseek(ap->afile, ap->afpos, 0);
+
 			i = safe_read(ap->afile, bp->buf, sizeof(bp->buf));
+
 			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;
 	}
@@ -4423,9 +5074,10 @@ register struct ioarg *ap;
 		return (c);
 	} else
 #endif
+
 	{
 		i = safe_read(ap->afile, &c, sizeof(c));
-		return (i == sizeof(c) ? c & 0177 : (closef(ap->afile), 0));
+		return (i == sizeof(c) ? (c & 0x7f) : (closef(ap->afile), 0));
 	}
 }
 
@@ -4433,7 +5085,7 @@ register struct ioarg *ap;
  * Return the characters from a here temp file.
  */
 static int herechar(ap)
-register struct ioarg *ap;
+REGISTER struct ioarg *ap;
 {
 	char c;
 
@@ -4454,7 +5106,7 @@ static int gravechar(ap, iop)
 struct ioarg *ap;
 struct io *iop;
 {
-	register int c;
+	REGISTER int c;
 
 	if ((c = qgravechar(ap, iop) & ~QUOTE) == '\n')
 		c = ' ';
@@ -4462,10 +5114,12 @@ struct io *iop;
 }
 
 static int qgravechar(ap, iop)
-register struct ioarg *ap;
+REGISTER struct ioarg *ap;
 struct io *iop;
 {
-	register int c;
+	REGISTER int c;
+
+	DBGPRINTF3(("QGRAVECHAR: enter, ap=0x%x, iop=0x%x\n", ap, iop));
 
 	if (iop->xchar) {
 		if (iop->nlcount) {
@@ -4491,9 +5145,9 @@ struct io *iop;
  * Return a single command (usually the first line) from a file.
  */
 static int linechar(ap)
-register struct ioarg *ap;
+REGISTER struct ioarg *ap;
 {
-	register int c;
+	REGISTER int c;
 
 	if ((c = filechar(ap)) == '\n') {
 		if (!multiline) {
@@ -4505,7 +5159,7 @@ register struct ioarg *ap;
 }
 
 static void prs(s)
-register char *s;
+REGISTER char *s;
 {
 	if (*s)
 		write(2, s, strlen(s));
@@ -4518,7 +5172,7 @@ unsigned u;
 }
 
 static void closef(i)
-register int i;
+REGISTER int i;
 {
 	if (i > 2)
 		close(i);
@@ -4526,41 +5180,51 @@ register int i;
 
 static void closeall()
 {
-	register int u;
+	REGISTER int u;
 
 	for (u = NUFILE; u < NOFILE;)
 		close(u++);
 }
 
+
 /*
  * remap fd into Shell's fd space
  */
 static int remap(fd)
-register int fd;
+REGISTER int fd;
 {
-	register int i;
+	REGISTER int i;
 	int map[NOFILE];
+	int newfd;
+
+
+	DBGPRINTF(("REMAP: fd=%d, e.iofd=%d\n", fd, e.iofd));
 
 	if (fd < e.iofd) {
 		for (i = 0; i < NOFILE; i++)
 			map[i] = 0;
+
 		do {
 			map[fd] = 1;
-			fd = dup(fd);
+			newfd = dup(fd);
+			fd = newfd;
 		} 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);
 }
 
 static int openpipe(pv)
-register int *pv;
+REGISTER int *pv;
 {
-	register int i;
+	REGISTER int i;
 
 	if ((i = pipe(pv)) < 0)
 		err("can't create pipe - try again");
@@ -4568,7 +5232,7 @@ register int *pv;
 }
 
 static void closepipe(pv)
-register int *pv;
+REGISTER int *pv;
 {
 	if (pv != NULL) {
 		close(*pv++);
@@ -4583,17 +5247,21 @@ register int *pv;
  */
 
 static void markhere(s, iop)
-register char *s;
+REGISTER char *s;
 struct ioword *iop;
 {
-	register struct here *h, *lh;
+	REGISTER struct here *h, *lh;
+
+	DBGPRINTF7(("MARKHERE: enter, s=0x%x\n", s));
 
 	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;
@@ -4616,7 +5284,9 @@ struct ioword *iop;
 
 static void gethere()
 {
-	register struct here *h, *hp;
+	REGISTER struct here *h, *hp;
+
+	DBGPRINTF7(("GETHERE: enter...\n"));
 
 	/* Scan here files first leaving inhere list in place */
 	for (hp = h = inhere; h != NULL; hp = h, h = h->h_next)
@@ -4632,19 +5302,22 @@ static void gethere()
 
 static void readhere(name, s, ec)
 char **name;
-register char *s;
+REGISTER char *s;
 int ec;
 {
 	int tf;
 	char tname[30] = ".msh_XXXXXX";
-	register int c;
+	REGISTER int c;
 	jmp_buf ev;
 	char myline[LINELIM + 1];
 	char *thenext;
 
+	DBGPRINTF7(("READHERE: enter, name=0x%x, s=0x%x\n", name, s));
+
 	tf = mkstemp(tname);
 	if (tf < 0)
 		return;
+
 	*name = strsave(tname, areanum);
 	if (newenv(setjmp(errpt = ev)) != 0)
 		unlink(tname);
@@ -4693,18 +5366,22 @@ static int herein(hname, xdoll)
 char *hname;
 int xdoll;
 {
-	register int hf;
+	REGISTER int hf;
 	int tf;
 
 #if __GNUC__
 	/* Avoid longjmp clobbering */
 	(void) &tf;
 #endif
-	if (hname == 0)
+	if (hname == NULL)
 		return (-1);
+
+	DBGPRINTF7(("HEREIN: hname is %s, xdoll=%d\n", hname, xdoll));
+
 	hf = open(hname, 0);
 	if (hf < 0)
 		return (-1);
+
 	if (xdoll) {
 		char c;
 		char tname[30] = ".msh_XXXXXX";
@@ -4733,7 +5410,9 @@ int xdoll;
 
 static void scraphere()
 {
-	register struct here *h;
+	REGISTER struct here *h;
+
+	DBGPRINTF7(("SCRAPHERE: enter...\n"));
 
 	for (h = inhere; h != NULL; h = h->h_next) {
 		if (h->h_iop && h->h_iop->io_name)
@@ -4746,7 +5425,9 @@ static void scraphere()
 static void freehere(area)
 int area;
 {
-	register struct here *h, *hl;
+	REGISTER struct here *h, *hl;
+
+	DBGPRINTF6(("FREEHERE: enter, area=%d\n", area));
 
 	hl = NULL;
 	for (h = acthere; h != NULL; h = h->h_next)
-- 
2.25.1