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add json output mode to enumerate_devices #31

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add json output mode to enumerate_devices #31

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74 changes: 72 additions & 2 deletions src/libhs/examples/enumerate_devices/enumerate_devices.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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);
Expand All @@ -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;
}