+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
#include <jansson.h>
-char *json_dumps(const json_t *json, uint32_t flags)
+typedef int (*dump_func)(const char *buffer, int size, void *data);
+
+static int dump_to_file(const char *buffer, int size, void *data)
+{
+ FILE *dest = (FILE *)data;
+ if(fwrite(buffer, size, 1, dest) != 1)
+ return -1;
+ return 0;
+}
+
+static int dump_indent(uint32_t flags, int depth, dump_func dump, void *data)
+{
+ if(JSON_INDENT(flags) > 0)
+ {
+ char *ws_buffer;
+ int ws_count = JSON_INDENT(flags) * depth;
+
+ if(dump("\n", 1, data))
+ return -1;
+
+ if(ws_count == 0)
+ return 0;
+
+ ws_buffer = alloca(ws_count);
+ memset(ws_buffer, ' ', ws_count);
+ return dump(ws_buffer, ws_count, data);
+ }
+ else
+ return dump(" ", 1, data);
+}
+
+static int dump_string(const char *str, dump_func dump, void *data)
{
- (void)flags;
+ const char *end;
+
+ if(dump("\"", 1, data))
+ return -1;
+
+ end = str;
+ while(*end)
+ {
+ while(*end && *end != '\\' && *end != '"')
+ end++;
+
+ if(end != str)
+ if(dump(str, end - str, data))
+ return -1;
+ if(*end == '\\')
+ {
+ if(dump("\\\\", 2, data))
+ return -1;
+ end++;
+ }
+ else if(*end == '"')
+ {
+ if(dump("\\\"", 2, data))
+ return -1;
+ end++;
+ }
+ str = end;
+ }
+
+ return dump("\"", 1, data);
+}
+
+static int do_dump(const json_t *json, uint32_t flags, int depth,
+ dump_func dump, void *data)
+{
switch(json_typeof(json)) {
case JSON_NULL:
- printf("null");
- break;
+ return dump("null", 4, data);
case JSON_TRUE:
- printf("true");
- break;
+ return dump("true", 4, data);
case JSON_FALSE:
- printf("false");
- break;
+ return dump("false", 5, data);
case JSON_NUMBER:
- printf("%f", json_number_value(json));
- break;
+ {
+ char *buffer;
+ int size, ret;
+
+ size = asprintf(&buffer, "%.17f", json_number_value(json));
+ if(size == -1)
+ return -1;
+
+ ret = dump(buffer, size, data);
+ free(buffer);
+ return ret;
+ }
case JSON_STRING:
- printf("%s", json_string_value(json));
- break;
+ return dump_string(json_string_value(json), dump, data);
+
+ case JSON_ARRAY:
+ {
+ int i;
+ int n = json_array_size(json);
+
+ if(dump("[", 1, data))
+ return -1;
+ if(n == 0)
+ dump("]", 1, data);
+ if(dump_indent(flags, depth + 1, dump, data))
+ return -1;
- case JSON_ARRAY: {
- int i, n = json_array_size(json);
- printf("[");
for(i = 0; i < n; ++i) {
- json_dumps(json_array_get(json, i), 0);
+ if(do_dump(json_array_get(json, i), flags, depth + 1,
+ dump, data))
+ return -1;
+
if(i < n - 1)
- printf(", ");
+ {
+ if(dump(",", 1, data) ||
+ dump_indent(flags, depth + 1, dump, data))
+ return -1;
+ }
+ else
+ {
+ if(dump_indent(flags, depth, dump, data))
+ return -1;
+ }
}
- printf("]");
- break;
+ return dump("]", 1, data);
+ }
+
+ case JSON_OBJECT:
+ {
+ void *iter = json_object_iter((json_t *)json);
+
+ if(dump("{", 1, data))
+ return -1;
+ if(!iter)
+ return dump("}", 1, data);
+ if(dump_indent(flags, depth + 1, dump, data))
+ return -1;
+
+ while(iter)
+ {
+ void *next = json_object_iter_next((json_t *)json, iter);
+
+ dump_string(json_object_iter_key(iter), dump, data);
+ if(dump(": ", 2, data) ||
+ do_dump(json_object_iter_value(iter), flags, depth + 1,
+ dump, data))
+ return -1;
+
+ if(next)
+ {
+ if(dump(",", 1, data) ||
+ dump_indent(flags, depth + 1, dump, data))
+ return -1;
+ }
+ else
+ {
+ if(dump_indent(flags, depth, dump, data))
+ return -1;
+ }
+
+ iter = next;
+ }
+ return dump("}", 1, data);
}
default:
- printf("<object>");
- break;
+ /* not reached */
+ return -1;
}
- return NULL;
}
+
+int json_dumpf(const json_t *json, FILE *output, uint32_t flags)
+{
+ if(do_dump(json, flags, 0, dump_to_file, (void *)output))
+ return -1;
+ return dump_to_file("\n", 1, (void *)output);
+}