Add -Wshadow to Makefile and fix the resulting warnings. Many of

the warnings are due to the use of globals with generic names,
specifically "options" and "path".  I've renamed "options" to
"sh_options" since it holds the shell options and "path" to
"search_path".  OK jca@ tb@

12 files changed, 66 insertions, 70 deletions

diff --git a/bin/ksh/Makefile b/bin/ksh/Makefile
index 0e356cf1337..64a36668b7c 100644
--- a/bin/ksh/Makefile
+++ b/bin/ksh/Makefile
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.34 2017/08/01 14:30:05 deraadt Exp $
+#	$OpenBSD: Makefile,v 1.35 2017/12/27 13:02:57 millert Exp $
 
 PROG=	ksh
 SRCS=	alloc.c c_ksh.c c_sh.c c_test.c c_ulimit.c edit.c emacs.c eval.c \
@@ -6,7 +6,7 @@ SRCS=	alloc.c c_ksh.c c_sh.c c_test.c c_ulimit.c edit.c emacs.c eval.c \
 	misc.c path.c shf.c syn.c table.c trap.c tree.c tty.c var.c \
 	version.c vi.c
 
-DEFS=	-Wall -DEMACS -DVI
+DEFS=	-Wall -Wshadow -DEMACS -DVI
 CFLAGS+=${DEFS} -I. -I${.CURDIR} -I${.CURDIR}/../../lib/libc/gen
 MAN=	ksh.1 sh.1
 
diff --git a/bin/ksh/c_ksh.c b/bin/ksh/c_ksh.c
index ac10540be21..c762b22272e 100644
--- a/bin/ksh/c_ksh.c
+++ b/bin/ksh/c_ksh.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: c_ksh.c,v 1.51 2017/09/03 11:52:01 jca Exp $	*/
+/*	$OpenBSD: c_ksh.c,v 1.52 2017/12/27 13:02:57 millert Exp $	*/
 
 /*
  * built-in Korn commands: c_*
@@ -941,8 +941,8 @@ c_alias(char **wp)
 				afree(ap->val.s, APERM);
 			}
 			/* ignore values for -t (at&t ksh does this) */
-			newval = tflag ? search(alias, path, X_OK, NULL) :
-			    val;
+			newval = tflag ? search(alias, search_path, X_OK, NULL)
+			    : val;
 			if (newval) {
 				ap->val.s = str_save(newval, APERM);
 				ap->flag |= ALLOC|ISSET;
@@ -1184,7 +1184,7 @@ c_kill(char **wp)
 					shprintf("%s%s", p, sigtraps[i].name);
 			shprintf("\n");
 		} else {
-			int mess_width = 0, w, i;
+			int mess_width = 0, w;
 			struct kill_info ki = {
 				.num_width = 1,
 				.name_width = 0,
diff --git a/bin/ksh/c_sh.c b/bin/ksh/c_sh.c
index 155b1c5ff33..6adacef4010 100644
--- a/bin/ksh/c_sh.c
+++ b/bin/ksh/c_sh.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: c_sh.c,v 1.61 2017/12/07 01:54:33 tb Exp $	*/
+/*	$OpenBSD: c_sh.c,v 1.62 2017/12/27 13:02:57 millert Exp $	*/
 
 /*
  * built-in Bourne commands
@@ -200,7 +200,7 @@ c_dot(char **wp)
 
 	if ((cp = wp[builtin_opt.optind]) == NULL)
 		return 0;
-	file = search(cp, path, R_OK, &err);
+	file = search(cp, search_path, R_OK, &err);
 	if (file == NULL) {
 		bi_errorf("%s: %s", cp, err ? strerror(err) : "not found");
 		return 1;
@@ -250,7 +250,7 @@ int
 c_read(char **wp)
 {
 	int c = 0;
-	int expand = 1, history = 0;
+	int expand = 1, savehist = 0;
 	int expanding;
 	int ecode = 0;
 	char *cp;
@@ -274,7 +274,7 @@ c_read(char **wp)
 			expand = 0;
 			break;
 		case 's':
-			history = 1;
+			savehist = 1;
 			break;
 		case 'u':
 			if (!*(cp = builtin_opt.optarg))
@@ -320,7 +320,7 @@ c_read(char **wp)
 	 * coproc_readw_close(fd);
 	 */
 
-	if (history)
+	if (savehist)
 		Xinit(xs, xp, 128, ATEMP);
 	expanding = 0;
 	Xinit(cs, cp, 128, ATEMP);
@@ -348,7 +348,7 @@ c_read(char **wp)
 				}
 				break;
 			}
-			if (history) {
+			if (savehist) {
 				Xcheck(xs, xp);
 				Xput(xs, xp, c);
 			}
@@ -404,7 +404,7 @@ c_read(char **wp)
 	}
 
 	shf_flush(shf);
-	if (history) {
+	if (savehist) {
 		Xput(xs, xp, '\0');
 		source->line++;
 		histsave(source->line, Xstring(xs, xp), 1);
diff --git a/bin/ksh/edit.c b/bin/ksh/edit.c
index fb85f9ff7f0..115091b179f 100644
--- a/bin/ksh/edit.c
+++ b/bin/ksh/edit.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: edit.c,v 1.57 2016/09/08 12:12:40 nicm Exp $	*/
+/*	$OpenBSD: edit.c,v 1.58 2017/12/27 13:02:57 millert Exp $	*/
 
 /*
  * Command line editing - common code
@@ -229,7 +229,7 @@ set_editmode(const char *ed)
 	if ((rcp = strrchr(ed, '/')))
 		ed = ++rcp;
 	for (i = 0; i < NELEM(edit_flags); i++)
-		if (strstr(ed, options[(int) edit_flags[i]].name)) {
+		if (strstr(ed, sh_options[(int) edit_flags[i]].name)) {
 			change_flag(edit_flags[i], OF_SPECIAL, 1);
 			return;
 		}
@@ -459,7 +459,7 @@ x_command_glob(int flags, const char *str, int slen, char ***wordsp)
 	for (l = genv->loc; l; l = l->next)
 		glob_table(pat, &w, &l->funs);
 
-	glob_path(flags, pat, &w, path);
+	glob_path(flags, pat, &w, search_path);
 	if ((fpath = str_val(global("FPATH"))) != null)
 		glob_path(flags, pat, &w, fpath);
 
diff --git a/bin/ksh/emacs.c b/bin/ksh/emacs.c
index a990e12ddf9..a3afaa7c09a 100644
--- a/bin/ksh/emacs.c
+++ b/bin/ksh/emacs.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: emacs.c,v 1.76 2017/12/18 19:04:53 anton Exp $	*/
+/*	$OpenBSD: emacs.c,v 1.77 2017/12/27 13:02:57 millert Exp $	*/
 
 /*
  *  Emacs-like command line editing and history
@@ -1995,8 +1995,6 @@ x_prev_histword(int c)
 			rcp++;
 		x_ins(rcp);
 	} else {
-		int c;
-
 		rcp = cp;
 		/*
 		 * ignore white-space at start of line
diff --git a/bin/ksh/exec.c b/bin/ksh/exec.c
index 054f8f3e7cc..09484b8cf75 100644
--- a/bin/ksh/exec.c
+++ b/bin/ksh/exec.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: exec.c,v 1.69 2017/12/18 20:30:14 anton Exp $	*/
+/*	$OpenBSD: exec.c,v 1.70 2017/12/27 13:02:57 millert Exp $	*/
 
 /*
  * execute command tree
@@ -707,7 +707,7 @@ scriptexec(struct op *tp, char **ap)
 
 	shell = str_val(global("EXECSHELL"));
 	if (shell && *shell)
-		shell = search(shell, path, X_OK, NULL);
+		shell = search(shell, search_path, X_OK, NULL);
 	if (!shell || !*shell)
 		shell = _PATH_BSHELL;
 
@@ -900,8 +900,8 @@ findcom(const char *name, int flags)
 			}
 			tp->flag = DEFINED;	/* make ~ISSET */
 		}
-		npath = search(name, flags & FC_DEFPATH ? def_path : path,
-		    X_OK, &tp->u2.errno_);
+		npath = search(name, flags & FC_DEFPATH ? def_path :
+		    search_path, X_OK, &tp->u2.errno_);
 		if (npath) {
 			if (tp == &temp) {
 				tp->val.s = npath;
diff --git a/bin/ksh/lex.c b/bin/ksh/lex.c
index 858eb898cbf..25799420068 100644
--- a/bin/ksh/lex.c
+++ b/bin/ksh/lex.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: lex.c,v 1.73 2017/12/12 00:18:58 tb Exp $	*/
+/*	$OpenBSD: lex.c,v 1.74 2017/12/27 13:02:57 millert Exp $	*/
 
 /*
  * lexical analysis and source input
@@ -1446,8 +1446,6 @@ dopprompt(const char *sp, int ntruncate, const char **spp, int doprint)
 		else if (*++cp == '!')
 			c = *cp++;
 		else {
-			char *p;
-
 			shf_snprintf(p = nbuf, sizeof(nbuf), "%d",
 			    source->line + 1);
 			len = strlen(nbuf);
diff --git a/bin/ksh/misc.c b/bin/ksh/misc.c
index c1a6006b8d0..e0fdd4a1ca9 100644
--- a/bin/ksh/misc.c
+++ b/bin/ksh/misc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: misc.c,v 1.60 2017/10/19 07:54:05 jca Exp $	*/
+/*	$OpenBSD: misc.c,v 1.61 2017/12/27 13:02:57 millert Exp $	*/
 
 /*
  * Miscellaneous functions
@@ -115,7 +115,7 @@ Xcheck_grow_(XString *xsp, char *xp, int more)
 	return xsp->beg + (xp - old_beg);
 }
 
-const struct option options[] = {
+const struct option sh_options[] = {
 	/* Special cases (see parse_args()): -A, -o, -s.
 	 * Options are sorted by their longnames - the order of these
 	 * entries MUST match the order of sh_flag F* enumerations in sh.h.
@@ -183,8 +183,8 @@ option(const char *n)
 {
 	int i;
 
-	for (i = 0; i < NELEM(options); i++)
-		if (options[i].name && strcmp(options[i].name, n) == 0)
+	for (i = 0; i < NELEM(sh_options); i++)
+		if (sh_options[i].name && strcmp(sh_options[i].name, n) == 0)
 			return i;
 
 	return -1;
@@ -195,7 +195,7 @@ struct options_info {
 	struct {
 		const char *name;
 		int	flag;
-	} opts[NELEM(options)];
+	} opts[NELEM(sh_options)];
 };
 
 static char *options_fmt_entry(void *arg, int i, char *buf, int buflen);
@@ -225,10 +225,10 @@ printoptions(int verbose)
 		/* verbose version */
 		shprintf("Current option settings\n");
 
-		for (i = n = oi.opt_width = 0; i < NELEM(options); i++) {
-			if (options[i].name) {
-				len = strlen(options[i].name);
-				oi.opts[n].name = options[i].name;
+		for (i = n = oi.opt_width = 0; i < NELEM(sh_options); i++) {
+			if (sh_options[i].name) {
+				len = strlen(sh_options[i].name);
+				oi.opts[n].name = sh_options[i].name;
 				oi.opts[n++].flag = i;
 				if (len > oi.opt_width)
 					oi.opt_width = len;
@@ -239,11 +239,11 @@ printoptions(int verbose)
 	} else {
 		/* short version ala ksh93 */
 		shprintf("set");
-		for (i = 0; i < NELEM(options); i++) {
-			if (options[i].name)
+		for (i = 0; i < NELEM(sh_options); i++) {
+			if (sh_options[i].name)
 				shprintf(" %co %s",
 					 Flag(i) ? '-' : '+',
-					 options[i].name);
+					 sh_options[i].name);
 		}
 		shprintf("\n");
 	}
@@ -256,9 +256,9 @@ getoptions(void)
 	char m[(int) FNFLAGS + 1];
 	char *cp = m;
 
-	for (i = 0; i < NELEM(options); i++)
-		if (options[i].c && Flag(i))
-			*cp++ = options[i].c;
+	for (i = 0; i < NELEM(sh_options); i++)
+		if (sh_options[i].c && Flag(i))
+			*cp++ = sh_options[i].c;
 	*cp = 0;
 	return str_save(m, ATEMP);
 }
@@ -328,8 +328,8 @@ parse_args(char **argv,
     int what,			/* OF_CMDLINE or OF_SET */
     int *setargsp)
 {
-	static char cmd_opts[NELEM(options) + 3]; /* o:\0 */
-	static char set_opts[NELEM(options) + 5]; /* Ao;s\0 */
+	static char cmd_opts[NELEM(sh_options) + 3]; /* o:\0 */
+	static char set_opts[NELEM(sh_options) + 5]; /* Ao;s\0 */
 	char *opts;
 	char *array = NULL;
 	Getopt go;
@@ -345,12 +345,12 @@ parse_args(char **argv,
 		/* see set_opts[] declaration */
 		strlcpy(set_opts, "A:o;s", sizeof set_opts);
 		q = set_opts + strlen(set_opts);
-		for (i = 0; i < NELEM(options); i++) {
-			if (options[i].c) {
-				if (options[i].flags & OF_CMDLINE)
-					*p++ = options[i].c;
-				if (options[i].flags & OF_SET)
-					*q++ = options[i].c;
+		for (i = 0; i < NELEM(sh_options); i++) {
+			if (sh_options[i].c) {
+				if (sh_options[i].flags & OF_CMDLINE)
+					*p++ = sh_options[i].c;
+				if (sh_options[i].flags & OF_SET)
+					*q++ = sh_options[i].c;
 			}
 		}
 		*p = '\0';
@@ -395,7 +395,7 @@ parse_args(char **argv,
 				 * if the output of "set +o" is to be used.
 				 */
 				;
-			else if (i >= 0 && (options[i].flags & what))
+			else if (i >= 0 && (sh_options[i].flags & what))
 				change_flag((enum sh_flag) i, what, set);
 			else {
 				bi_errorf("%s: bad option", go.optarg);
@@ -412,14 +412,14 @@ parse_args(char **argv,
 				sortargs = 1;
 				break;
 			}
-			for (i = 0; i < NELEM(options); i++)
-				if (optc == options[i].c &&
-				    (what & options[i].flags)) {
+			for (i = 0; i < NELEM(sh_options); i++)
+				if (optc == sh_options[i].c &&
+				    (what & sh_options[i].flags)) {
 					change_flag((enum sh_flag) i, what,
 					    set);
 					break;
 				}
-			if (i == NELEM(options)) {
+			if (i == NELEM(sh_options)) {
 				internal_errorf(1, "parse_args: `%c'", optc);
 				return -1; /* not reached */
 			}
diff --git a/bin/ksh/sh.h b/bin/ksh/sh.h
index 06e7b0ec938..53d7ed6ef24 100644
--- a/bin/ksh/sh.h
+++ b/bin/ksh/sh.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sh.h,v 1.65 2017/10/19 07:54:05 jca Exp $	*/
+/*	$OpenBSD: sh.h,v 1.66 2017/12/27 13:02:57 millert Exp $	*/
 
 /*
  * Public Domain Bourne/Korn shell
@@ -124,7 +124,7 @@ struct option {
     char	c;	/* character flag (if any) */
     short	flags;	/* OF_* */
 };
-extern const struct option options[];
+extern const struct option sh_options[];
 
 /*
  * flags (the order of these enums MUST match the order in misc.c(options[]))
diff --git a/bin/ksh/table.c b/bin/ksh/table.c
index 074fc13ddea..d93ecddb9f2 100644
--- a/bin/ksh/table.c
+++ b/bin/ksh/table.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: table.c,v 1.23 2015/11/01 15:38:53 mmcc Exp $	*/
+/*	$OpenBSD: table.c,v 1.24 2017/12/27 13:02:57 millert Exp $	*/
 
 /*
  * dynamic hashed associative table for commands and variables
@@ -18,7 +18,7 @@ struct table aliases;	/* aliases */
 struct table keywords;	/* keywords */
 struct table homedirs;	/* homedir() cache */
 
-char *path;		/* copy of either PATH or def_path */
+char *search_path;	/* copy of either PATH or def_path */
 const char *def_path;	/* path to use if PATH not set */
 char *tmpdir;		/* TMPDIR value */
 const char *prompt;
diff --git a/bin/ksh/table.h b/bin/ksh/table.h
index 107790d3ce2..063ae8f9534 100644
--- a/bin/ksh/table.h
+++ b/bin/ksh/table.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: table.h,v 1.12 2017/08/30 17:08:45 jca Exp $	*/
+/*	$OpenBSD: table.h,v 1.13 2017/12/27 13:02:57 millert Exp $	*/
 
 /* $From: table.h,v 1.3 1994/05/31 13:34:34 michael Exp $ */
 
@@ -175,7 +175,7 @@ extern const struct builtin shbuiltins [], kshbuiltins [];
 #define PS1	0		/* command */
 #define PS2	1		/* command continuation */
 
-extern char *path;		/* copy of either PATH or def_path */
+extern char *search_path;	/* copy of either PATH or def_path */
 extern const char *def_path;	/* path to use if PATH not set */
 extern char *tmpdir;		/* TMPDIR value */
 extern const char *prompt;
diff --git a/bin/ksh/var.c b/bin/ksh/var.c
index 16805460d87..73d894897ff 100644
--- a/bin/ksh/var.c
+++ b/bin/ksh/var.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: var.c,v 1.59 2017/08/30 17:08:45 jca Exp $	*/
+/*	$OpenBSD: var.c,v 1.60 2017/12/27 13:02:57 millert Exp $	*/
 
 #include <sys/stat.h>
 
@@ -525,11 +525,11 @@ formatstr(struct tbl *vp, const char *s)
 		int slen;
 
 		if (vp->flag & RJUST) {
-			const char *q = s + olen;
-			/* strip trailing spaces (at&t ksh uses q[-1] == ' ') */
-			while (q > s && isspace((unsigned char)q[-1]))
-				--q;
-			slen = q - s;
+			const char *r = s + olen;
+			/* strip trailing spaces (at&t ksh uses r[-1] == ' ') */
+			while (r > s && isspace((unsigned char)r[-1]))
+				--r;
+			slen = r - s;
 			if (slen > vp->u2.field) {
 				s += slen - vp->u2.field;
 				slen = vp->u2.field;
@@ -960,8 +960,8 @@ setspec(struct tbl *vp)
 
 	switch (special(vp->name)) {
 	case V_PATH:
-		afree(path, APERM);
-		path = str_save(str_val(vp), APERM);
+		afree(search_path, APERM);
+		search_path = str_save(str_val(vp), APERM);
 		flushcom(1);	/* clear tracked aliases */
 		break;
 	case V_IFS:
@@ -1067,8 +1067,8 @@ unsetspec(struct tbl *vp)
 {
 	switch (special(vp->name)) {
 	case V_PATH:
-		afree(path, APERM);
-		path = str_save(def_path, APERM);
+		afree(search_path, APERM);
+		search_path = str_save(def_path, APERM);
 		flushcom(1);	/* clear tracked aliases */
 		break;
 	case V_IFS: