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authorKaarle Ritvanen2017-04-12 00:58:46 +0300
committerDenys Vlasenko2017-04-12 20:11:34 +0200
commit835ad3a984c5590ae4f6c94f2f0781ea049d1ae8 (patch)
treecb86c5441c258f66358faa93ef899e09a7788de8 /include/libbb.h
parentc5496d3585bcab3c39f9b10f638ba0c94f5cda3f (diff)
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libbb: GETOPT_RESET macro
Signed-off-by: Kaarle Ritvanen <kaarle.ritvanen@datakunkku.fi> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'include/libbb.h')
-rw-r--r--include/libbb.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/include/libbb.h b/include/libbb.h
index 2c30bde..11d022f 100644
--- a/include/libbb.h
+++ b/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.