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authorJosé Bollo <jose.bollo@iot.bzh>2017-05-19 12:07:44 +0200
committerJosé Bollo <jose.bollo@iot.bzh>2017-05-19 23:04:44 +0200
commite9040472b72ff699964d89dda03ef07ce72b487b (patch)
treeb4377da5a4ea8e00c457a7fa40096458eaecf593
parent66451a0d658eabab18f37995659d81d429e0138e (diff)
Add json2c for including json in C files
Change-Id: I08d8f1c249d5612831fcbc66fe5d0caee4e3a73d Signed-off-by: José Bollo <jose.bollo@iot.bzh>
-rw-r--r--src/genskel/CMakeLists.txt8
-rw-r--r--src/genskel/json2c.c174
2 files changed, 182 insertions, 0 deletions
diff --git a/src/genskel/CMakeLists.txt b/src/genskel/CMakeLists.txt
index ac1d1210..b1d63825 100644
--- a/src/genskel/CMakeLists.txt
+++ b/src/genskel/CMakeLists.txt
@@ -17,6 +17,14 @@
###########################################################################
ADD_EXECUTABLE(afb-genskel genskel.c)
+ADD_EXECUTABLE(afb-exprefs exprefs.c)
+ADD_EXECUTABLE(afb-json2c json2c.c)
+
TARGET_LINK_LIBRARIES(afb-genskel ${link_libraries})
+TARGET_LINK_LIBRARIES(afb-exprefs ${link_libraries})
+TARGET_LINK_LIBRARIES(afb-json2c ${link_libraries})
+
INSTALL(TARGETS afb-genskel RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+INSTALL(TARGETS afb-exprefs RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+INSTALL(TARGETS afb-json2c RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
diff --git a/src/genskel/json2c.c b/src/genskel/json2c.c
new file mode 100644
index 00000000..cb541bfd
--- /dev/null
+++ b/src/genskel/json2c.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 2016, 2017 "IoT.bzh"
+ * Author José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ * This simple program expands the object { "$ref": "#/path/to/a/target" }
+ *
+ * For example:
+ *
+ * {
+ * "type":{
+ * "a": "int",
+ * "b": { "$ref": "#/type/a" }
+ * }
+ * }
+ *
+ * will be exapanded to
+ *
+ * {
+ * "type":{
+ * "a": "int",
+ * "b": "int"
+ * }
+ * }
+ *
+ * Invocation: program [file|-]...
+ *
+ * without arguments, it reads the input.
+ */
+
+#define _GNU_SOURCE
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <json-c/json.h>
+
+#define oom(x) do{if(!(x)){fprintf(stderr,"out of memory\n");exit(1);}}while(0)
+
+/**
+ * root of the JSON being parsed
+ */
+struct json_object *root = NULL;
+
+char *make_desc(struct json_object *o)
+{
+ const char *a, *b;
+ char *desc, c, buf[3];
+ size_t len;
+ int i, pos, e;
+
+ a = b = json_object_to_json_string_ext(root, 0);
+ len = 1;
+ while((c = *b++)) {
+ len += 1 + ('"' == c);
+ }
+
+ len += 7 * (1 + len / 72);
+ desc = malloc(len);
+ oom(desc);
+
+ len = pos = 0;
+ b = a;
+ while((c = *b++)) {
+ if (c == '"') {
+ buf[0] = '\\';
+ buf[1] = '"';
+ buf[2] = 0;
+ }
+ else if (c == '\\') {
+ switch ((c = *b++)) {
+ case 0:
+ b--;
+ break;
+ case '/':
+ buf[0] = '/';
+ buf[1] = 0;
+ break;
+ default:
+ buf[0] = '\\';
+ buf[1] = c;
+ buf[2] = 0;
+ break;
+ }
+ }
+ else {
+ buf[0] = c;
+ buf[1] = 0;
+ }
+ i = e = 0;
+ while (buf[i]) {
+ if (pos >= 77 && !e) {
+ desc[len++] = '"';
+ desc[len++] = '\n';
+ pos = 0;
+ }
+ if (pos == 0) {
+ desc[len++] = ' ';
+ desc[len++] = ' ';
+ desc[len++] = ' ';
+ desc[len++] = ' ';
+ desc[len++] = '"';
+ pos = 5;
+ }
+ c = buf[i++];
+ desc[len++] = c;
+ e = !e && c == '\\';
+ pos++;
+ }
+ }
+ desc[len++] = '"';
+ desc[len++] = '\n';
+ desc[len] = 0;
+ return desc;
+}
+
+/**
+ * process a file and prints its expansion on stdout
+ */
+void process(char *filename)
+{
+ char *desc;
+
+ /* translate - */
+ if (!strcmp(filename, "-"))
+ filename = "/dev/stdin";
+
+ /* check access */
+ if (access(filename, R_OK)) {
+ fprintf(stderr, "can't access file %s\n", filename);
+ exit(1);
+ }
+
+ /* read the file */
+ root = json_object_from_file(filename);
+ if (!root) {
+ fprintf(stderr, "reading file %s produced null\n", filename);
+ exit(1);
+ }
+
+ /* create the description */
+ desc = make_desc(root);
+
+ printf("%s", desc);
+
+ /* clean up */
+ json_object_put(root);
+ free(desc);
+}
+
+/** process the list of files or stdin if none */
+int main(int ac, char **av)
+{
+ if (!*++av)
+ process("-");
+ else {
+ do { process(*av); } while(*++av);
+ }
+ return 0;
+}
+
+