Add JSON_REAL_PRECISION

Fixes #178.

test/bin/json_process.c

@@ -39,6 +39,7 @@ struct config {
     int use_env;
     int have_hashseed;
     int hashseed;
+    int precision;
 } conf;
 
 #define l_isspace(c) ((c) == ' ' || (c) == '\n' || (c) == '\r' || (c) == '\t')
@@ -108,6 +109,8 @@ static void read_conf(FILE *conffile)
             conf.preserve_order = atoi(val);
         if (!strcmp(line, "JSON_SORT_KEYS"))
             conf.sort_keys = atoi(val);
+        if (!strcmp(line, "JSON_REAL_PRECISION"))
+            conf.precision = atoi(val);
         if (!strcmp(line, "STRIP"))
             conf.strip = atoi(val);
         if (!strcmp(line, "HASHSEED")) {
@@ -176,11 +179,10 @@ int use_conf(char *test_path)
         fclose(conffile);
     }
 
-    if (conf.indent < 0 || conf.indent > 255) {
+    if (conf.indent < 0 || conf.indent > 31) {
         fprintf(stderr, "invalid value for JSON_INDENT: %d\n", conf.indent);
         return 2;
     }
-
     if (conf.indent)
         flags |= JSON_INDENT(conf.indent);
 
@@ -196,6 +198,14 @@ int use_conf(char *test_path)
     if (conf.sort_keys)
         flags |= JSON_SORT_KEYS;
 
+    if (conf.precision < 0 || conf.precision > 31) {
+        fprintf(stderr, "invalid value for JSON_REAL_PRECISION: %d\n",
+                conf.precision);
+        return 2;
+    }
+    if (conf.precision)
+        flags |= JSON_REAL_PRECISION(conf.precision);
+
     if (conf.have_hashseed)
         json_object_seed(conf.hashseed);
 
@@ -245,7 +255,7 @@ static int getenv_int(const char *name)
 
 int use_env()
 {
-    int indent;
+    int indent, precision;
     size_t flags = 0;
     json_t *json;
     json_error_t error;
@@ -258,11 +268,10 @@ int use_env()
     #endif
 
     indent = getenv_int("JSON_INDENT");
-    if(indent < 0 || indent > 255) {
+    if(indent < 0 || indent > 31) {
         fprintf(stderr, "invalid value for JSON_INDENT: %d\n", indent);
         return 2;
     }
-
     if(indent > 0)
         flags |= JSON_INDENT(indent);
 
@@ -278,9 +287,19 @@ int use_env()
     if(getenv_int("JSON_SORT_KEYS"))
         flags |= JSON_SORT_KEYS;
 
+    precision = getenv_int("JSON_REAL_PRECISION");
+    if(precision < 0 || precision > 31) {
+        fprintf(stderr, "invalid value for JSON_REAL_PRECISION: %d\n",
+                precision);
+        return 2;
+    }
+
     if(getenv("HASHSEED"))
         json_object_seed(getenv_int("HASHSEED"));
 
+    if(precision > 0)
+        flags |= JSON_REAL_PRECISION(precision);
+
     if(getenv_int("STRIP")) {
         /* Load to memory, strip leading and trailing whitespace */
         size_t size = 0, used = 0;