store_json: Escape special characters in strings.

diff --git a/src/core/store_json.c b/src/core/store_json.c
index 493ac9f377c9072d54fdf76488ab242e76cc6ec6..8ec717515b69c7e480f0f46c289af689004c4a03 100644 (file)
--- a/src/core/store_json.c
+++ b/src/core/store_json.c
@@ -39,7 +39,9 @@
 
 #include <assert.h>
 
+#include <ctype.h>
 #include <stdlib.h>
+#include <string.h>
 
 /*
  * private data types
@@ -64,11 +66,39 @@ struct sdb_store_json_formatter {
  * private helper functions
  */
 
+static void
+escape_string(const char *src, char *dest)
+{
+       size_t i = 1;
+       dest[0] = '"';
+       for ( ; *src; ++src) {
+               char c = *src;
+               if ((c == '"') || (c == '\\') || iscntrl((int)c)) {
+                       dest[i] = '\\';
+                       ++i;
+               }
+               switch (c) {
+                       case '\a': dest[i] = 'a'; break;
+                       case '\b': dest[i] = 'b'; break;
+                       case '\t': dest[i] = 't'; break;
+                       case '\n': dest[i] = 'n'; break;
+                       case '\v': dest[i] = 'v'; break;
+                       case '\f': dest[i] = 'f'; break;
+                       case '\r': dest[i] = 'r'; break;
+                       default: dest[i] = c; break;
+               }
+               ++i;
+       }
+       dest[i] = '"';
+       dest[i + 1] = '\0';
+} /* escape_string */
+
 static int
 json_emit(sdb_store_json_formatter_t *f, sdb_store_obj_t *obj)
 {
        char time_str[64];
        char interval_str[64];
+       char name[2 * strlen(SDB_OBJ(obj)->name) + 3];
        size_t i;
 
        assert(f && obj);
@@ -84,13 +114,23 @@ json_emit(sdb_store_json_formatter_t *f, sdb_store_obj_t *obj)
                }
        }
 
-       sdb_strbuf_append(f->buf, "{\"name\": \"%s\", ", SDB_OBJ(obj)->name);
+       escape_string(SDB_OBJ(obj)->name, name);
+       sdb_strbuf_append(f->buf, "{\"name\": %s, ", name);
        if (obj->type == SDB_ATTRIBUTE) {
                char tmp[sdb_data_strlen(&ATTR(obj)->value) + 1];
+               char val[2 * sizeof(tmp) + 3];
                if (sdb_data_format(&ATTR(obj)->value, tmp, sizeof(tmp),
                                        SDB_DOUBLE_QUOTED) < 0)
                        snprintf(tmp, sizeof(tmp), "<error>");
-               sdb_strbuf_append(f->buf, "\"value\": %s, ", tmp);
+
+               if (tmp[0] == '"') {
+                       /* a string; escape_string handles quoting */
+                       tmp[strlen(tmp) - 1] = '\0';
+                       escape_string(tmp + 1, val);
+                       sdb_strbuf_append(f->buf, "\"value\": %s, ", val);
+               }
+               else
+                       sdb_strbuf_append(f->buf, "\"value\": %s, ", tmp);
        }
 
        /* TODO: make time and interval formats configurable */