Possible fix for Coverity CID#7:

convert options() prototype to unsigned (size_t, in fact), and make an
explicitly casted (size_t)-1 the error return code, modelled after what
is often used in Unix libraries

funcs.c

@@ -5,7 +5,7 @@
 
 #include "sh.h"
 
-__RCSID("$MirOS: src/bin/mksh/funcs.c,v 1.51 2007/05/13 18:15:25 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/funcs.c,v 1.52 2007/05/13 18:33:28 tg Exp $");
 
 int
 c_cd(const char **wp)
@@ -2517,14 +2517,14 @@ int
 test_eval(Test_env *te, Test_op op, const char *opnd1, const char *opnd2,
     int do_eval)
 {
-	int res;
-	int not;
+	int i;
+	size_t k;
 	struct stat b1, b2;
 
 	if (!do_eval)
 		return 0;
 
-	switch ((int) op) {
+	switch ((int)op) {
 	/*
 	 * Unary Operators
 	 */
@@ -2533,16 +2533,16 @@ test_eval(Test_env *te, Test_op op, const char *opnd1, const char *opnd2,
 	case TO_STZER: /* -z */
 		return *opnd1 == '\0';
 	case TO_OPTION: /* -o */
-		if ((not = *opnd1 == '!'))
+		if ((i = *opnd1 == '!'))
 			opnd1++;
-		if ((res = option(opnd1)) < 0)
-			res = 0;
+		if ((k = option(opnd1)) == (size_t)-1)
+			k = 0;
 		else {
-			res = Flag(res);
-			if (not)
-				res = !res;
+			k = Flag(k);
+			if (i)
+				k = !k;
 		}
-		return res;
+		return k;
 	case TO_FILRD: /* -r */
 		return test_eaccess(opnd1, R_OK) == 0;
 	case TO_FILWR: /* -w */
@@ -2584,12 +2584,12 @@ test_eval(Test_env *te, Test_op op, const char *opnd1, const char *opnd2,
 	case TO_FILGZ: /* -s */
 		return stat(opnd1, &b1) == 0 && b1.st_size > 0L;
 	case TO_FILTT: /* -t */
-		if (opnd1 && !bi_getn(opnd1, &res)) {
+		if (opnd1 && !bi_getn(opnd1, &i)) {
 			te->flags |= TEF_ERROR;
-			res = 0;
+			i = 0;
 		} else
-			res = isatty(opnd1 ? res : 0);
-		return res;
+			i = isatty(opnd1 ? i : 0);
+		return (i);
 	case TO_FILUID: /* -O */
 		return stat(opnd1, &b1) == 0 && b1.st_uid == ksheuid;
 	case TO_FILGID: /* -G */

misc.c

@@ -6,7 +6,7 @@
 #include <grp.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.53 2007/05/13 17:51:23 tg Exp $\t"
+__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.54 2007/05/13 18:33:29 tg Exp $\t"
 	MKSH_SH_H_ID);
 
 #undef USE_CHVT
@@ -145,16 +145,16 @@ const struct option options[] = {
 /*
  * translate -o option into F* constant (also used for test -o option)
  */
-int
+size_t
 option(const char *n)
 {
-	unsigned i;
+	size_t i;
 
 	for (i = 0; i < NELEM(options); i++)
 		if (options[i].name && strcmp(options[i].name, n) == 0)
-			return i;
+			return (i);
 
-	return -1;
+	return ((size_t)-1);
 }
 
 struct options_info {
@@ -277,8 +277,8 @@ parse_args(const char **argv,
 	char *opts;
 	const char *array = NULL;
 	Getopt go;
+	size_t i;
 	int optc, set, sortargs = 0, arrayset = 0;
-	unsigned i;
 
 	/* First call?  Build option strings... */
 	if (cmd_opts[0] == '\0') {
@@ -350,18 +350,18 @@ parse_args(const char **argv,
 				break;
 			}
 			i = option(go.optarg);
-			if (i != (unsigned)-1 && set == Flag(i))
+			if ((i != (size_t)-1) && set == Flag(i))
 				/* Don't check the context if the flag
 				 * isn't changing - makes "set -o interactive"
 				 * work if you're already interactive.  Needed
 				 * if the output of "set +o" is to be used.
 				 */
 				;
-			else if (i != (unsigned)-1 && (options[i].flags & what))
-				change_flag((enum sh_flag) i, what, set);
+			else if ((i != (size_t)-1) && (options[i].flags & what))
+				change_flag((enum sh_flag)i, what, set);
 			else {
 				bi_errorf("%s: bad option", go.optarg);
-				return -1;
+				return (-1);
 			}
 			break;
 

sh.h

@@ -8,7 +8,7 @@
 /*	$OpenBSD: c_test.h,v 1.4 2004/12/20 11:34:26 otto Exp $	*/
 /*	$OpenBSD: tty.h,v 1.5 2004/12/20 11:34:26 otto Exp $	*/
 
-#define MKSH_SH_H_ID "$MirOS: src/bin/mksh/sh.h,v 1.129 2007/05/13 17:51:23 tg Exp $"
+#define MKSH_SH_H_ID "$MirOS: src/bin/mksh/sh.h,v 1.130 2007/05/13 18:33:29 tg Exp $"
 #define MKSH_VERSION "R29 2007/05/10"
 
 #if HAVE_SYS_PARAM_H
@@ -1386,7 +1386,7 @@ char *str_save(const char *, Area *);
 #define str_save(s,ap) (str_nsave((s), (s) ? strlen(s) : 0, (ap)))
 #endif
 char *str_nsave(const char *, int, Area *);
-int option(const char *);
+size_t option(const char *);
 char *getoptions(void);
 void change_flag(enum sh_flag, int, int);
 int parse_args(const char **, int, int *);