Ensure the right number of tests are performed against the given log.

src/options.c

@@ -563,7 +563,7 @@ parse_long_opt (const char *name, const char *oarg)
     int tests = strtol (oarg, &sEnd, 10);
     if (oarg == sEnd || *sEnd != '\0' || errno == ERANGE)
       return;
-    conf.num_tests = tests;
+    conf.num_tests = tests >= 0 ? tests : 0;
   }
 
   /* process and exit */

src/parser.c

@@ -2560,16 +2560,23 @@ static int
 read_line (GLog * glog, char *line, int *test, int *cnt, int dry_run)
 {
   int ret = 0;
+  int tests = conf.num_tests;
+
   /* start processing log line */
   if ((ret = pre_process_log (glog, line, dry_run)) == 0 && *test)
     *test = 0;
 
   /* soft ignores */
   if (ret == -1)
     return 0;
+
+  /* glog->processed can actually be less than conf.num_tests, so we make sure
+   * (cnt) compares to the right number */
+  tests = MIN (conf.num_tests, glog->processed);
+
   /* reached num of lines to test and no valid records were found, log
    * format is likely not matching */
-  if (conf.num_tests >= 0 && ++(*cnt) == conf.num_tests && *test) {
+  if (conf.num_tests && ++(*cnt) == tests && *test) {
     uncount_processed (glog);
     uncount_invalid (glog);
     return 1;

src/settings.h

@@ -163,12 +163,12 @@ typedef struct GConf_
   int no_parsing_spinner;           /* disable parsing spinner */
   int no_progress;                  /* disable progress metrics */
   int no_tab_scroll;                /* don't scroll dashboard on tab */
-  int num_tests;                    /* number of lines to test */
   int output_stdout;                /* outputting to stdout */
   int process_and_exit;             /* parse and exit without outputting */
   int real_os;                      /* show real OSs */
   int real_time_html;               /* enable real-time HTML output */
   int skip_term_resolver;           /* no terminal resolver */
+  uint32_t num_tests;               /* number of lines to test */
   uint64_t log_size;                /* log size override */
 
   /* Internal flags */