Explicitly specify -? as an option in mm2gv

diff --git a/cmd/tools/mm2gv.c b/cmd/tools/mm2gv.c
index 0bf67c189b26f12b37999546e0b417e049c06981..73a1f6a9750ea5b0da04f6792decece8efce9f6e 100644 (file)
--- a/cmd/tools/mm2gv.c
+++ b/cmd/tools/mm2gv.c
@@ -391,7 +391,7 @@ static void init(int argc, char **argv, parms_t * p)
 
     cmd = argv[0];
     opterr = 0;
-    while ((c = getopt(argc, argv, ":o:uvclU:")) != -1) {
+    while ((c = getopt(argc, argv, ":o:uvclU:?")) != -1) {
        switch (c) {
        case 'o':
            p->outf = openF(optarg, "w");
@@ -421,7 +421,7 @@ static void init(int argc, char **argv, parms_t * p)
            fprintf(stderr, "%s: option -%c missing argument - ignored\n", cmd, optopt);
            break;
        case '?':
-           if (optopt == '?')
+           if (optopt == '\0')
                usage(0);
            else {
                fprintf(stderr,