From b1fc2852e06c6e179dd57f830ed871f1cb27d991 Mon Sep 17 00:00:00 2001
From: Omer Kilic <omerkilic@gmail.com>
Date: Tue, 19 Jun 2018 16:44:52 +0100
Subject: [PATCH] add json output mode: "--json".

---
 .../enumerate_devices/enumerate_devices.c     | 74 ++++++++++++++++++-
 1 file changed, 72 insertions(+), 2 deletions(-)

diff --git a/src/libhs/examples/enumerate_devices/enumerate_devices.c b/src/libhs/examples/enumerate_devices/enumerate_devices.c
index 408296f0..c025eaba 100644
--- a/src/libhs/examples/enumerate_devices/enumerate_devices.c
+++ b/src/libhs/examples/enumerate_devices/enumerate_devices.c
@@ -10,11 +10,15 @@
 
 #include <inttypes.h>
 #include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
 
 /* For single-file use you need a tiny bit more than that, see libhs.h for
    more information. */
 #include "../../libhs.h"
 
+bool json_first_object = true;
+
 static int device_callback(hs_device *dev, void *udata)
 {
     (void)(udata);
@@ -23,27 +27,93 @@ static int device_callback(hs_device *dev, void *udata)
            dev->location, dev->iface_number, dev->vid, dev->pid,
            hs_device_type_strings[dev->type]);
     printf("  - device node:   %s\n", dev->path);
+
     if (dev->manufacturer_string)
+    {
         printf("  - manufacturer:  %s\n", dev->manufacturer_string);
+    }
+
     if (dev->product_string)
+    {
         printf("  - product:       %s\n", dev->product_string);
+    }
+
     if (dev->serial_number_string)
+    {
         printf("  - serial number: %s\n", dev->serial_number_string);
+    }
 
     /* If you return a non-zero value, the enumeration is aborted and this value is returned
        from the calling function. */
     return 0;
 }
 
-int main(void)
+static int device_callback_json(hs_device *dev, void *udata)
+{
+    (void)(udata);
+
+    if (json_first_object)
+    {
+        json_first_object = false;  /* not the first object any more */
+        printf("{\n");
+    }
+    else
+    {
+        printf(",\n{\n");
+    }
+
+    printf("  \"location\": \"%s@%" PRIu8
+           "\",\n  \"vid\": \"%04" PRIx16
+           "\",\n  \"pid\": \"%04" PRIx16
+           "\",\n  \"type\": \"%s\"",
+           dev->location, dev->iface_number, dev->vid, dev->pid,
+           hs_device_type_strings[dev->type]);
+
+    printf(",\n  \"node\": \"%s\"", dev->path);
+
+    if (dev->manufacturer_string)
+    {
+        printf(",\n  \"manufacturer\": \"%s\"", dev->manufacturer_string);
+    }
+
+    if (dev->product_string)
+    {
+       printf(",\n  \"product\": \"%s\"", dev->product_string);
+    }
+
+    if (dev->serial_number_string)
+    {
+        printf(",\n  \"serial\": \"%s\"", dev->serial_number_string);
+    }
+
+	printf("\n}");
+
+    /* If you return a non-zero value, the enumeration is aborted and this value is returned
+       from the calling function. */
+    return 0;
+}
+
+int main(int argc, char *argv[])
 {
     int r;
 
     /* Go through the device tree and call our callback for each device. The callback can abort
        the enumeration by returning a non-zero value. */
-    r = hs_enumerate(NULL, 0, device_callback, NULL);
+    if (argc > 1 && (strcmp(argv[1], "--json") == 0))
+    {
+		printf("[\n");
+        r = hs_enumerate(NULL, 0, device_callback_json, NULL);
+		printf("\n]\n");
+    }
+    else
+    {
+        r = hs_enumerate(NULL, 0, device_callback, NULL);
+    }
+
     if (r < 0)
+    {
         return -r;
+    }
 
     return 0;
 }