Support --version in utility programs.

[adns.git] / client / adnslogres.c

diff --git a/client/adnslogres.c b/client/adnslogres.c
index 3aa7e0eea867e619a4e9c577760e1eb1323c9240..2f13fb02fbca246ff6143f2c003c13f6a2d7aa9d 100644 (file)
--- a/client/adnslogres.c
+++ b/client/adnslogres.c
@@ -46,6 +46,7 @@ static const char * const cvsid =
 
 #include "config.h"
 #include "adns.h"
+#include "client.h"
 
 #ifdef ADNS_REGRESS_TEST
 # include "hredirect.h"
@@ -218,9 +219,18 @@ static void proclog(FILE *inf, FILE *outf, int maxpending, int opts) {
   adns_finish(adns);
 }
 
+static void printhelp(FILE *file) {
+  fputs("usage: adnslogres [<options>] [<logfile>]\n"
+       "       adnslogres --version|--help\n"
+       "options: -c <concurrency>  set max number of outstanding queries\n"
+       "         -p                use poll(2) instead of select(2)\n"
+       "         -d                turn on debugging\n"
+       "         -C <config>       use instead of contents of resolv.conf\n",
+       stdout);
+}
+
 static void usage(void) {
-  fprintf(stderr, "usage: %s [-d] [-p] [-c concurrency] [-C config] [logfile]\n",
-         progname);
+  printhelp(stderr);
   exit(1);
 }
 
@@ -229,6 +239,18 @@ int main(int argc, char *argv[]) {
   extern char *optarg;
   FILE *inf;
 
+  if (argv[1] && !strncmp(argv[1],"--",2)) {
+    if (!strcmp(argv[1],"--help")) {
+      printhelp(stdout);
+    } else if (!strcmp(argv[1],"--version")) {
+      fputs(VERSION_MESSAGE("adnslogres"),stdout);
+    } else {
+      usage();
+    }
+    if (ferror(stdout) || fclose(stdout)) { perror("stdout"); exit(1); }
+    exit(0);
+  }
+
   maxpending= DEFMAXPENDING;
   opts= 0;
   while ((c= getopt(argc, argv, "c:C:dp")) != -1)