[api] Implement saneopt_get_all

include/saneopt.h

@@ -30,6 +30,21 @@ int saneopt_alias(saneopt_t* opt, char* option, char* alias);
  */
 char* saneopt_get(saneopt_t* opt, char* option);
 
+/*
+ * Get all values for option called `option`.
+ * Return value is a NULL-terminated array.
+ *
+ * For example, getting all values for "option", with the following args:
+ *
+ *   ./app --option first --option second
+ *
+ * Will return ["first", "second"].
+ *
+ * If a occurrence is lacking a value (e.g. `--option --next-option`), it'll be
+ * set to "".
+ */
+char** saneopt_get_all(saneopt_t* opt, char* option);
+
 /*
  * Get command line arguments, that is: any arguments not being an argument
  * value and all arguments after "--".

src/saneopt.c

@@ -91,6 +91,34 @@ char* saneopt_get(saneopt_t* opt, char* option) {
   return NULL;
 }
 
+char** saneopt_get_all(saneopt_t* opt, char* option) {
+  int i, count;
+  char* arg;
+  char** result = malloc(sizeof(char*));
+  result[0] = NULL;
+
+  for (i = 0; i < opt->argc; i++) {
+    arg = opt->argv[i];
+
+    if (strcmp(arg, "--") == 0)
+      return result;
+
+    if (saneopt__matches(opt, option, arg)) {
+      result = realloc(result, sizeof(char*) * (++count + 1));
+
+      if (result == NULL)
+        return NULL;
+
+      result[count - 1] = ((i + 1) < opt->argc && opt->argv[i + 1][0] != '-')
+        ? opt->argv[i + 1]
+        : "";
+      result[count] = NULL;
+    }
+  }
+
+  return result;
+}
+
 char** saneopt_arguments(saneopt_t* opt) {
   int i, count = 0, saw_marker = 0, saw_option = 0, saw_value = 0;;
   char* arg;

test/test-saneopt.c

@@ -129,6 +129,28 @@ void test_arguments() {
   free(opt);
 }
 
+void test_all() {
+  printf("test_all()\n");
+
+  char** argv = malloc(4 * sizeof(char*));
+  char** args;
+
+  argv[0] = "--option";
+  argv[1] = "first";
+  argv[2] = "--option";
+  argv[3] = "second";
+
+  saneopt_t* opt = saneopt_init(4, argv);
+  args = saneopt_get_all(opt, "option");
+  assert(strcmp(args[0], "first") == 0);
+  assert(strcmp(args[1], "second") == 0);
+  assert(args[2] == NULL);
+
+  free(argv);
+  free(opt);
+  free(args);
+}
+
 int main(int argc, char** argv) {
   test_no_arg();
   test_no_value();
@@ -137,6 +159,7 @@ int main(int argc, char** argv) {
   test_short_alias();
   test_stop_after_arguments();
   test_arguments();
+  test_all();
 
   return 0;
 }