Renamed misleading "contrib" subfolder to "dependencies".

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/dependencies/jsmn/example/simple.c b/dependencies/jsmn/example/simple.c
new file mode 100644
index 000000000..1254575a1
--- /dev/null
+++ b/dependencies/jsmn/example/simple.c
@@ -0,0 +1,77 @@
+#include "../jsmn.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * A small example of jsmn parsing when JSON structure is known and number of
+ * tokens is predictable.
+ */
+
+static const char *JSON_STRING =
+    "{\"user\": \"johndoe\", \"admin\": false, \"uid\": 1000,\n  "
+    "\"groups\": [\"users\", \"wheel\", \"audio\", \"video\"]}";
+
+static int jsoneq(const char *json, jsmntok_t *tok, const char *s) {
+  if (tok->type == JSMN_STRING && (int)strlen(s) == tok->end - tok->start &&
+      strncmp(json + tok->start, s, tok->end - tok->start) == 0) {
+    return 0;
+  }
+  return -1;
+}
+
+int main() {
+  int i;
+  int r;
+  jsmn_parser p;
+  jsmntok_t t[128]; /* We expect no more than 128 tokens */
+
+  jsmn_init(&p);
+  r = jsmn_parse(&p, JSON_STRING, strlen(JSON_STRING), t,
+                 sizeof(t) / sizeof(t[0]));
+  if (r < 0) {
+    printf("Failed to parse JSON: %d\n", r);
+    return 1;
+  }
+
+  /* Assume the top-level element is an object */
+  if (r < 1 || t[0].type != JSMN_OBJECT) {
+    printf("Object expected\n");
+    return 1;
+  }
+
+  /* Loop over all keys of the root object */
+  for (i = 1; i < r; i++) {
+    if (jsoneq(JSON_STRING, &t[i], "user") == 0) {
+      /* We may use strndup() to fetch string value */
+      printf("- User: %.*s\n", t[i + 1].end - t[i + 1].start,
+             JSON_STRING + t[i + 1].start);
+      i++;
+    } else if (jsoneq(JSON_STRING, &t[i], "admin") == 0) {
+      /* We may additionally check if the value is either "true" or "false" */
+      printf("- Admin: %.*s\n", t[i + 1].end - t[i + 1].start,
+             JSON_STRING + t[i + 1].start);
+      i++;
+    } else if (jsoneq(JSON_STRING, &t[i], "uid") == 0) {
+      /* We may want to do strtol() here to get numeric value */
+      printf("- UID: %.*s\n", t[i + 1].end - t[i + 1].start,
+             JSON_STRING + t[i + 1].start);
+      i++;
+    } else if (jsoneq(JSON_STRING, &t[i], "groups") == 0) {
+      int j;
+      printf("- Groups:\n");
+      if (t[i + 1].type != JSMN_ARRAY) {
+        continue; /* We expect groups to be an array of strings */
+      }
+      for (j = 0; j < t[i + 1].size; j++) {
+        jsmntok_t *g = &t[i + j + 2];
+        printf("  * %.*s\n", g->end - g->start, JSON_STRING + g->start);
+      }
+      i += t[i + 1].size + 1;
+    } else {
+      printf("Unexpected key: %.*s\n", t[i].end - t[i].start,
+             JSON_STRING + t[i].start);
+    }
+  }
+  return EXIT_SUCCESS;
+}