Add command line option handling

1 files changed, 72 insertions, 20 deletions

diff --git a/src/caskbench.cpp b/src/caskbench.cpp
index 34556b6..a72acb1 100644
--- a/src/caskbench.cpp
+++ b/src/caskbench.cpp
@@ -3,25 +3,31 @@
 #include <assert.h>
 #include <sys/time.h>
 #include <cairo.h>
+#include <popt.h>
 
 #include "caskbench.h"
 
-typedef struct _caskbench_perf_case {
+typedef struct _caskbench_options {
+  int dry_run;
+  int iterations;
+} caskbench_options_t;
+
+typedef struct _caskbench_perf_test {
   const char *name;
   int (*setup)(cairo_t*);
   void (*teardown)(void);
-  int (*test)(cairo_t*);
-} caskbench_perf_case_t;
+  int (*test_case)(cairo_t*);
+} caskbench_perf_test_t;
 
 typedef struct _caskbench_result {
-  const char *test_name;
+  const char *test_case_name;
   int iterations;
   double min_run_time;
   double avg_run_time;
   int status;
 } caskbench_result_t;
 
-caskbench_perf_case_t perf_cases[] = {
+caskbench_perf_test_t perf_tests[] = {
   {"fill", setup_fill,   teardown_fill,   test_fill},
   {"image", setup_image,  teardown_image,  test_image},
   {"mask", setup_mask,   teardown_mask,   test_mask},
@@ -55,7 +61,7 @@ void
 display_results_json(const caskbench_result_t *result)
 {
   printf("   {\n");
-  printf("       \"test\": \"%s\",\n", result->test_name);
+  printf("       \"test case\": \"%s\",\n", result->test_case_name);
   printf("       \"iterations\": %d,\n", result->iterations);
   printf("       \"minimum run time (s)\": %f,\n", result->min_run_time);
   printf("       \"average run time (s)\": %f,\n", result->avg_run_time);
@@ -63,15 +69,56 @@ display_results_json(const caskbench_result_t *result)
   printf("   }");
 }
 
-// TODO: parse_options
-
 int
 main (int argc, char *argv[])
 {
   int c, i;
-  int iterations_requested = 16*1024;
+  caskbench_options_t opt;
   double start_time, stop_time, run_time, run_total;
 
+  poptContext pc;
+  struct poptOption po[] = {
+    {"iterations", 'i', POPT_ARG_INT, &opt.iterations, 0,
+     "The number of times each test case should be run",
+     NULL},
+    {"dry-run", 'n', POPT_ARG_NONE, &opt.dry_run, 0,
+     "Just list the selected test case names without executing",
+     "num"},
+    POPT_AUTOHELP
+    {NULL}
+  };
+  pc = poptGetContext(NULL, argc, (const char **)argv, po, 0);
+  poptSetOtherOptionHelp(pc, "[ARG...]");
+  poptReadDefaultConfig(pc, 0);
+
+  opt.dry_run = 0;
+  opt.iterations = 1024;
+
+  int rc = poptGetNextOpt(pc);
+  while ((rc = poptGetNextOpt(pc)) >= 0) {
+  }
+  if (rc != -1) {
+    // handle error
+    switch(rc) {
+    case POPT_ERROR_NOARG:
+      printf("Argument missing for an option\n");
+      exit(1);
+    case POPT_ERROR_BADOPT:
+      printf("Option's argument could not be parsed\n");
+      exit(1);
+    case POPT_ERROR_BADNUMBER:
+    case POPT_ERROR_OVERFLOW:
+      printf("Option could not be converted to number\n");
+      exit(1);
+    default:
+      printf("Unknown error in option processing\n");
+      exit(1);
+    }
+  }
+
+  // Remaining args are the tests to be run, or all if this list is empty
+  const char **tests = poptGetArgs(pc);
+
   // TODO: Open output file
   // start json
   printf("[\n");
@@ -80,27 +127,33 @@ main (int argc, char *argv[])
     caskbench_result_t result;
     cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 800, 80);
     cairo_t *cr = cairo_create(surface);
-    // If dry run, just list the test
+
+    // If dry run, just list the test cases
+    if (opt.dry_run) {
+      printf("%s\n", perf_tests[c].name);
+      continue;
+    }
+
     srand(0xdeadbeef);
 
-    result.test_name = perf_cases[c].name;
+    result.test_case_name = perf_tests[c].name;
     result.min_run_time = -1.0;
     result.avg_run_time = -1.0;
 
-    if (perf_cases[c].setup != NULL)
-      if (!perf_cases[c].setup(cr)) {
+    if (perf_tests[c].setup != NULL)
+      if (!perf_tests[c].setup(cr)) {
 	result.status = -1;
 	goto FINAL;
       }
 
     // TODO: Perhaps run once just to warm caches and calibrate
-    for (i=iterations_requested; i>=0; --i) {
+    for (i=opt.iterations; i>=0; --i) {
       try {
-	assert(perf_cases[c].test);
+	assert(perf_tests[c].test_case);
 	start_time = get_tick();
 
 	// Execute test_case
-	result.status = perf_cases[c].test(cr);
+	result.status = perf_tests[c].test_case(cr);
 
 	stop_time = get_tick();
 	run_time = stop_time - start_time;
@@ -109,7 +162,6 @@ main (int argc, char *argv[])
 	else
 	  result.min_run_time = MIN(run_time, result.min_run_time);
 	run_total += run_time;
-	printf("%f\n", run_time);
       } catch (...) {
 	printf("Unknown exception encountered\n");
 	// Mark as crashed
@@ -117,7 +169,7 @@ main (int argc, char *argv[])
 	goto FINAL;
       }
     }
-    result.iterations = iterations_requested - i;
+    result.iterations = opt.iterations - i;
     result.avg_run_time = run_total / (double)result.iterations;
 
     cairo_surface_write_to_png (surface, "fill.png");
@@ -129,8 +181,8 @@ main (int argc, char *argv[])
       printf(",");
     printf("\n");
 
-    if (perf_cases[c].teardown != NULL)
-      perf_cases[c].teardown();
+    if (perf_tests[c].teardown != NULL)
+      perf_tests[c].teardown();
     cairo_destroy(cr);
     cairo_surface_destroy(surface);
   }