[PATCH 1/3] libbb: GETOPT_RESET macro

[Kaarle Ritvanen]

Signed-off-by: Kaarle Ritvanen <kaarle.ritvanen at datakunkku.fi>
---
 include/libbb.h            | 19 +++++++++++++++++++
 libbb/getopt32.c           |  8 +-------
 libbb/vfork_daemon_rexec.c | 28 ++--------------------------
 runit/sv.c                 |  7 +------
 shell/shell_common.c       |  8 +-------
 util-linux/getopt.c        |  7 +------
 6 files changed, 25 insertions(+), 52 deletions(-)

diff --git a/include/libbb.h b/include/libbb.h
index 0407163..eb78619 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1178,6 +1178,25 @@ 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, 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__
+#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.
diff --git a/libbb/getopt32.c b/libbb/getopt32.c
index 497fc01..38fac14 100644
--- a/libbb/getopt32.c
+++ b/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__
-	optind = 0;
-#else /* BSD style */
-	optind = 1;
-	/* optreset = 1; */
-#endif
-	/* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */
+	GETOPT_RESET
 
 	/* Note: just "getopt() <= 0" will not work well for
 	 * "fake" short options, like this one:
diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c
index 2e7dc2d..e2a6b39 100644
--- a/libbb/vfork_daemon_rexec.c
+++ b/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__
-	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 */
+	GETOPT_RESET
 
 	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__
-	optind = 0;
-#else /* BSD style */
-	optind = 1;
-#endif
+	GETOPT_RESET
 
 	return rc & 0xff; /* don't confuse people with "exitcodes" >255 */
 }
diff --git a/runit/sv.c b/runit/sv.c
index 9e21322..4ba5df7 100644
--- a/runit/sv.c
+++ b/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__
-	optind = 0;
-#else /* BSD style */
-	optind = 1;
-	/* optreset = 1; */
-#endif
+	GETOPT_RESET
 
 	do {
 		if (opts & 1) {
diff --git a/shell/shell_common.c b/shell/shell_common.c
index 549b17c..cc9ac15 100644
--- a/shell/shell_common.c
+++ b/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__
-	optind = 0;
-#else /* BSD style */
-	optind = 1;
-	/* optreset = 1; */
-#endif
-	/* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */
+	GETOPT_RESET
 
 	argc = 1;
 	while (argv[argc])
diff --git a/util-linux/getopt.c b/util-linux/getopt.c
index 63294c5..9621582 100644
--- a/util-linux/getopt.c
+++ b/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__
-	optind = 0;
-#else /* BSD style */
-	optind = 1;
-	/* optreset = 1; */
-#endif
+	GETOPT_RESET
 
 	while (1) {
 #if ENABLE_FEATURE_GETOPT_LONG
-- 
2.9.3