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Diffstat (limited to 'libbb/getopt32.c')
-rw-r--r--libbb/getopt32.c27
1 files changed, 23 insertions, 4 deletions
diff --git a/libbb/getopt32.c b/libbb/getopt32.c
index 2452eb0..80d5d28 100644
--- a/libbb/getopt32.c
+++ b/libbb/getopt32.c
@@ -473,11 +473,30 @@ getopt32(char **argv, const char *applet_opts, ...)
}
}
- /* In case getopt32 was already called, reinit some state */
+ /* In case 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;
- /* optarg = NULL; opterr = 0; optopt = 0; ?? */
+ /* optreset = 1; */
+#endif
+ /* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */
- /* Note: just "getopt() <= 0" will not work good for
+ /* Note: just "getopt() <= 0" will not work well for
* "fake" short options, like this one:
* wget $'-\203' "Test: test" http://kernel.org/
* (supposed to act as --header, but doesn't) */
@@ -487,7 +506,7 @@ getopt32(char **argv, const char *applet_opts, ...)
#else
while ((c = getopt(argc, argv, applet_opts)) != -1) {
#endif
- c &= 0xff; /* fight libc's sign extends */
+ c &= 0xff; /* fight libc's sign extension */
loop_arg_is_opt:
for (on_off = complementary; on_off->opt != c; on_off++) {
/* c==0 if long opt have non NULL flag */