rexel: support -B for backtrack testing.

Add -B option and improve usage() message.

Signed-off-by: NeilBrown <neil@brown.name>

diff --git a/rexel.c b/rexel.c
index 204309eaed1e68b0703aafb4c91e5c1ec1ae17ff..90134c10082f48393852fb4d92b651991cf52550 100644 (file)
--- a/rexel.c
+++ b/rexel.c
@@ -2641,6 +2641,14 @@ static void run_tests(bool trace)
        }
 }
 
+static void usage(void)
+{
+       fprintf(stderr, "Usage: rexel -itvB pattern target\n");
+       fprintf(stderr, "     : rexel -itvB -f pattern file\n");
+       fprintf(stderr, "     : rexel -T  # run tests\n");
+       fprintf(stderr, "     : -i=ignore case, -t=trace -v=verbatim pattern, -B=backtrack\n");
+}
+
 int main(int argc, char *argv[])
 {
        unsigned short *rxl;
@@ -2655,13 +2663,14 @@ int main(int argc, char *argv[])
        int ccnt = 0;
        int ignore_case = 0;
        int verbatim = 0;
+       int backtrack = 0;
        int opt;
        int trace = False;
        const char *patn, *target, *t;
        char prefix[100];
        int plen;
 
-       while ((opt = getopt(argc, argv, "itvlTf")) > 0)
+       while ((opt = getopt(argc, argv, "itvTfB")) > 0)
                switch (opt) {
                case 'f':
                        use_file = 1; break;
@@ -2671,21 +2680,19 @@ int main(int argc, char *argv[])
                        verbatim = 1; break;
                case 't':
                        trace = True; break;
+               case 'B':
+                       backtrack = RXLF_BACKTRACK; break;
                case 'T':
                        run_tests(trace);
                        printf("All tests passed successfully\n");
                        exit(0);
                default:
-                       fprintf(stderr, "Usage: rexel -itvl pattern target\n");
-                       fprintf(stderr, "     : rexel -itvl -f pattern file\n");
-                       fprintf(stderr, "     : rexel -T\n");
+                       usage();
                        exit(1);
                }
 
        if (optind + 2 != argc) {
-               fprintf(stderr,
-                       "Usage: rexel -ivl pattern target\n"
-                       "   or: rexel -T\n");
+               usage();
                exit(1);
        }
        patn = argv[optind];
@@ -2722,7 +2729,7 @@ int main(int argc, char *argv[])
        else
                printf("No static prefix\n");
 
-       st = rxl_prepare(rxl, 0);
+       st = rxl_prepare(rxl, backtrack);
        st->trace = trace;
        t = target;
        flags = RXL_SOL|RXL_SOD;