iio-utils: remove warning from VS2019_Win64

scan.c(167,33): warning C4267: '=': conversion from 'size_t' to 'unsigned int', possible loss of data
iio_writedev.c(500,65): warning C4244: '=': conversion from 'uint64_t' to 'unsigned int', possible loss of data
iio_readdev.c(455,65): warning C4244: '=': conversion from 'uint64_t' to 'unsigned int', possible loss of data

so just cast strlen to a (unsigned int); and use uint64_t as default

Signed-off-by: Robin Getz <[email protected]>

Author: rgetz

scan.c

@@ -164,7 +164,7 @@ struct iio_scan_context * iio_create_scan_context(
 
 	if (backend) {
 		/* Replace the colon separator with a comma. */
-		len = strlen(ctx->backendopts);
+		len = (unsigned int)strlen(ctx->backendopts);
 		for (i = 0; i < len; i++)
 			if (ctx->backendopts[i] == ':')
 				ctx->backendopts[i] = ',';

tests/iio_readdev.c

@@ -198,14 +198,14 @@ int main(int argc, char **argv)
 	unsigned int i, j, nb_channels;
 	unsigned int nb_active_channels = 0;
 	unsigned int buffer_size = SAMPLES_PER_READ;
-	unsigned int refill_per_benchmark = REFILL_PER_BENCHMARK;
+	uint64_t refill_per_benchmark = REFILL_PER_BENCHMARK;
 	int c;
 	struct iio_device *dev;
 	ssize_t sample_size;
 	ssize_t ret;
 	struct option *opts;
 	bool mib, benchmark = false;
-	uint64_t before, after, rate, total;
+	uint64_t before = 0, after, rate, total;
 
 	argw = dup_argv(MY_NAME, argc, argv);
 

tests/iio_writedev.c

@@ -209,14 +209,14 @@ int main(int argc, char **argv)
 	unsigned int i, j, nb_channels;
 	unsigned int nb_active_channels = 0;
 	unsigned int buffer_size = SAMPLES_PER_READ;
-	unsigned int refill_per_benchmark = REFILL_PER_BENCHMARK;
+	uint64_t refill_per_benchmark = REFILL_PER_BENCHMARK;
 	int c;
 	struct iio_device *dev;
 	ssize_t sample_size;
 	bool mib, cyclic_buffer = false, benchmark = false;
 	ssize_t ret;
 	struct option *opts;
-	uint64_t before, after, rate, total;
+	uint64_t before = 0, after, rate, total;
 
 	argw = dup_argv(MY_NAME, argc, argv);