add getopt reset support

based on proposed patches by Daniel Cegiełka, with minor changes:
- use a weak symbol for optreset so it doesn't clash with namespace
- also reset optpos (position in multi-option arg like -lR)
- also make getopt_long support reset

1 files changed, 11 insertions, 2 deletions

diff --git a/src/misc/getopt.c b/src/misc/getopt.c
index abf0e847..35880a09 100644
--- a/src/misc/getopt.c
+++ b/src/misc/getopt.c
@@ -3,10 +3,13 @@
 #include <string.h>
 #include <limits.h>
 #include <stdlib.h>
+#include "libc.h"
 
 char *optarg;
-int optind=1, opterr=1, optopt;
-static int optpos;
+int optind=1, opterr=1, optopt, __optpos, __optreset=0;
+
+#define optpos __optpos
+weak_alias(__optreset, optreset);
 
 int getopt(int argc, char * const argv[], const char *optstring)
 {
@@ -15,6 +18,12 @@ int getopt(int argc, char * const argv[], const char *optstring)
 	int k, l;
 	char *optchar;
 
+	if (!optind || __optreset) {
+		__optreset = 0;
+		__optpos = 0;
+		optind = 1;
+	}
+
 	if (optind >= argc || !argv[optind] || argv[optind][0] != '-' || !argv[optind][1])
 		return -1;
 	if (argv[optind][1] == '-' && !argv[optind][2])