First prototype of argument parsing for device description (issue #87).

examples/nfc-list.c

@@ -53,11 +53,11 @@ int main(int argc, const char* argv[])
   size_t szFound;
   size_t i;
   nfc_target_info_t nti;
-  nfc_device_desc_t *pnddDevices;
+  nfc_device_desc_t *pnddDevices = nfc_parse_device_desc(argc, argv, &szFound);
   const char* acLibnfcVersion;
 
-  if (argc > 1) {
+  if (argc > 1 && szFound == 0) {
-    errx (1, "usage: %s", argv[0]);
+    errx (1, "usage: %s [--device driver:port:speed]", argv[0]);
   }
 
   // Display libnfc version
@@ -85,6 +85,8 @@ int main(int argc, const char* argv[])
   pnd = nfc_connect(&ndd);
 #endif
 
+  if (szFound == 0)
+  {
     if (!(pnddDevices = malloc (MAX_DEVICE_COUNT * sizeof (*pnddDevices))))
     {
       fprintf (stderr, "malloc() failed\n");
@@ -92,6 +94,7 @@ int main(int argc, const char* argv[])
     }
 
     nfc_list_devices (pnddDevices, MAX_DEVICE_COUNT, &szFound);
+  }
 
   if (szFound == 0)
   {

include/nfc/nfc.h

@@ -85,6 +85,7 @@ NFC_EXPORT const char* nfc_device_name(nfc_device_t* pnd);
 NFC_EXPORT void iso14443a_crc(byte_t* pbtData, size_t szLen, byte_t* pbtCrc);
 NFC_EXPORT void append_iso14443a_crc(byte_t* pbtData, size_t szLen);
 NFC_EXPORT const char* nfc_version(void);
+NFC_EXPORT nfc_device_desc_t* nfc_parse_device_desc(int argc, const char *argv[], size_t* szFound);
 
 #ifdef __cplusplus 
 }

libnfc/nfc.c

@@ -1033,3 +1033,44 @@ const char* nfc_version(void)
   #endif // SVN_REVISION
 }
 
+/**
+ * @brief Tries to parse arguments to find device descriptions.
+ * @return Returns the list of found device descriptions.
+ */
+nfc_device_desc_t* nfc_parse_device_desc(int argc, const char *argv[], size_t* szFound)
+{
+  nfc_device_desc_t* pndd = 0;
+  *szFound = 0;
+  int arg;
+
+  // Get commandline options
+  for (arg=1;arg<argc;arg++) {
+
+    if (0 == strcmp(argv[arg], "--device")) {
+
+      if (argc > arg+1) {
+
+        pndd = malloc(sizeof(nfc_device_desc_t));
+
+        char buffer[256];
+        strncpy(buffer, argv[++arg], 256);
+
+        // Driver.
+        pndd->pcDriver = (char *)malloc(256);
+        strcpy(pndd->pcDriver, strtok(buffer, ":"));
+
+        // Port.
+        pndd->pcPort = (char *)malloc(256);
+        strcpy(pndd->pcPort, strtok(NULL, ":"));
+
+        // Speed.
+        sscanf(strtok(NULL, ":"), "%d", &pndd->uiSpeed);
+
+        *szFound = 1;
+      }
+      break;
+    }
+  }
+
+  return pndd;
+}