libbb: GETOPT_RESET macro

Signed-off-by: Kaarle Ritvanen <kaarle.ritvanen@datakunkku.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

include/libbb.h

@@ -1178,6 +1178,28 @@ extern uint32_t option_mask32;
 extern uint32_t getopt32(char **argv, const char *applet_opts, ...) FAST_FUNC;
 
 
+/* BSD-derived getopt() functions require that optind be set to 1 in
+ * order to reset getopt() state.  This used to be generally accepted
+ * way of resetting getopt().  However, glibc's getopt()
+ * has additional getopt() state beyond optind (specifically, glibc
+ * extensions ('+' and '-' at the start of the string), and requires
+ * that optind be set to zero to reset its state.  BSD-derived versions
+ * of getopt() misbehaved if optind is set to 0 in order to reset getopt(),
+ * and glibc's getopt() used to coredump if optind is set 1 in order
+ * to reset getopt().
+ * Then BSD introduced additional variable "optreset" which
+ * be set to 1 in order to reset getopt().  Sigh.  Standards, anyone?
+ *
+ * By ~2008, OpenBSD 3.4 was changed to survive glibc-like optind = 0
+ * (to interpret it as if optreset was set).
+ */
+#ifdef __GLIBC__
+#define GETOPT_RESET() (optind = 0)
+#else /* BSD style */
+#define GETOPT_RESET() (optind = 1)
+#endif
+
+
 /* Having next pointer as a first member allows easy creation
  * of "llist-compatible" structs, and using llist_FOO functions
  * on them.

libbb/getopt32.c

@@ -576,13 +576,7 @@ getopt32(char **argv, const char *applet_opts, ...)
 	 * run_nofork_applet() does this, but we might end up here
 	 * also via gunzip_main() -> gzip_main(). Play safe.
 	 */
-#ifdef __GLIBC__
+	GETOPT_RESET();
-	optind = 0;
-#else /* BSD style */
-	optind = 1;
-	/* optreset = 1; */
-#endif
-	/* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */
 
 	/* Note: just "getopt() <= 0" will not work well for
 	 * "fake" short options, like this one:

libbb/vfork_daemon_rexec.c

@@ -121,28 +121,8 @@ int FAST_FUNC run_nofork_applet(int applet_no, char **argv)
 
 	/* In case getopt() or getopt32() was already called:
 	 * reset the libc getopt() function, which keeps internal state.
-	 *
-	 * BSD-derived getopt() functions require that optind be set to 1 in
-	 * order to reset getopt() state.  This used to be generally accepted
-	 * way of resetting getopt().  However, glibc's getopt()
-	 * has additional getopt() state beyond optind, and requires that
-	 * optind be set to zero to reset its state.  So the unfortunate state of
-	 * affairs is that BSD-derived versions of getopt() misbehave if
-	 * optind is set to 0 in order to reset getopt(), and glibc's getopt()
-	 * will core dump if optind is set 1 in order to reset getopt().
-	 *
-	 * More modern versions of BSD require that optreset be set to 1 in
-	 * order to reset getopt().  Sigh.  Standards, anyone?
 	 */
-#ifdef __GLIBC__
+	GETOPT_RESET();
-	optind = 0;
-#else /* BSD style */
-	optind = 1;
-	/* optreset = 1; */
-#endif
-	/* optarg = NULL; opterr = 1; optopt = 63; - do we need this too? */
-	/* (values above are what they initialized to in glibc and uclibc) */
-	/* option_mask32 = 0; - not needed, no applet depends on it being 0 */
 
 	argc = 1;
 	while (argv[argc])
@@ -167,11 +147,7 @@ int FAST_FUNC run_nofork_applet(int applet_no, char **argv)
 	restore_nofork_data(&old);
 
 	/* Other globals can be simply reset to defaults */
-#ifdef __GLIBC__
+	GETOPT_RESET();
-	optind = 0;
-#else /* BSD style */
-	optind = 1;
-#endif
 
 	return rc & 0xff; /* don't confuse people with "exitcodes" >255 */
 }

runit/sv.c

@@ -688,12 +688,7 @@ int svc_main(int argc UNUSED_PARAM, char **argv)
 	/* getopt32() was already called:
 	 * reset the libc getopt() function, which keeps internal state.
 	 */
-#ifdef __GLIBC__
+	GETOPT_RESET();
-	optind = 0;
-#else /* BSD style */
-	optind = 1;
-	/* optreset = 1; */
-#endif
 
 	do {
 		if (opts & 1) {

shell/shell_common.c

@@ -401,13 +401,7 @@ shell_builtin_ulimit(char **argv)
 	/* In case getopt was already called:
 	 * reset the libc getopt() function, which keeps internal state.
 	 */
-#ifdef __GLIBC__
+	GETOPT_RESET();
-	optind = 0;
-#else /* BSD style */
-	optind = 1;
-	/* optreset = 1; */
-#endif
-	/* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */
 
 	argc = 1;
 	while (argv[argc])

util-linux/getopt.c

@@ -246,12 +246,7 @@ static int generate_output(char **argv, int argc, const char *optstr, const stru
 
 	/* We used it already in main() in getopt32(),
 	 * we *must* reset getopt(3): */
-#ifdef __GLIBC__
+	GETOPT_RESET();
-	optind = 0;
-#else /* BSD style */
-	optind = 1;
-	/* optreset = 1; */
-#endif
 
 	while (1) {
 #if ENABLE_FEATURE_GETOPT_LONG