Show a good example: Always check the return value of ftdi_init

[libftdi] / examples / bitbang.c

diff --git a/examples/bitbang.c b/examples/bitbang.c
index 74251ee..4a3a823 100644 (file)
--- a/examples/bitbang.c
+++ b/examples/bitbang.c
@@ -10,11 +10,16 @@ int main(int argc, char **argv)
     int f,i;
     char buf[1];
 
-    ftdi_init(&ftdic);
+    if (ftdi_init(&ftdic) < 0)
+    {
+        fprintf(stderr, "ftdi_init failed\n");
+        return EXIT_FAILURE;
+    }
 
     f = ftdi_usb_open(&ftdic, 0x0403, 0x6001);
 
-    if(f < 0 && f != -5) {
+    if (f < 0 && f != -5)
+    {
         fprintf(stderr, "unable to open ftdi device: %d (%s)\n", f, ftdi_get_error_string(&ftdic));
         exit(-1);
     }
@@ -29,7 +34,8 @@ int main(int argc, char **argv)
     buf[0] = 0x0;
     printf("turning everything on\n");
     f = ftdi_write_data(&ftdic, buf, 1);
-    if(f < 0) {
+    if (f < 0)
+    {
         fprintf(stderr,"write failed for 0x%x, error %d (%s)\n",buf[0],f, ftdi_get_error_string(&ftdic));
     }
 
@@ -38,21 +44,25 @@ int main(int argc, char **argv)
     buf[0] = 0xFF;
     printf("turning everything off\n");
     f = ftdi_write_data(&ftdic, buf, 1);
-    if(f < 0) {
+    if (f < 0)
+    {
         fprintf(stderr,"write failed for 0x%x, error %d (%s)\n",buf[0],f, ftdi_get_error_string(&ftdic));
     }
 
     sleep(3);
 
-    for(i = 0; i < 32; i++) {
+    for (i = 0; i < 32; i++)
+    {
         buf[0] =  0 | (0xFF ^ 1 << (i % 8));
-        if( i > 0 && (i % 8) == 0) {
+        if ( i > 0 && (i % 8) == 0)
+        {
             printf("\n");
         }
         printf("%02hhx ",buf[0]);
         fflush(stdout);
         f = ftdi_write_data(&ftdic, buf, 1);
-        if(f < 0) {
+        if (f < 0)
+        {
             fprintf(stderr,"write failed for 0x%x, error %d (%s)\n",buf[0],f, ftdi_get_error_string(&ftdic));
         }
         sleep(1);