diff --git a/include/villas/advio.h b/include/villas/advio.h
index f9f2bbaef..c4ca19a25 100644
--- a/include/villas/advio.h
+++ b/include/villas/advio.h
@@ -25,10 +25,10 @@ struct advio {
 typedef struct advio AFILE;
 
 /* The remaining functions from stdio are just replaced macros */
-
 #define afeof(af)			feof((af)->file)
 #define aftell(af)			ftell((af)->file)
 #define arewind(af)			rewind((af)->file)
+#define afileno(af)			fileno((af)->file)
 #define afread(ptr, sz, nitems, af)	fread(ptr, sz, nitems, (af)->file)
 #define afwrite(ptr, sz, nitems, af)	fwrite(ptr, sz, nitems, (af)->file)
 
diff --git a/lib/advio.c b/lib/advio.c
index 3c5bc526c..f2d942394 100644
--- a/lib/advio.c
+++ b/lib/advio.c
@@ -40,20 +40,20 @@ static int advio_xferinfo(void *p, curl_off_t dltotal, curl_off_t dlnow, curl_of
 	int dotz = round(frac * BAR_WIDTH);
 
 	// create the "meter"
-	printf("%3.0f%% in %f s (%" CURL_FORMAT_CURL_OFF_T " / %" CURL_FORMAT_CURL_OFF_T ") [", frac * 100, curtime, dlnow, dltotal);
+	fprintf(stderr, "%3.0f%% in %f s (%" CURL_FORMAT_CURL_OFF_T " / %" CURL_FORMAT_CURL_OFF_T ") [", frac * 100, curtime, dlnow, dltotal);
 
 	// part  that's full already
 	int i = 0;
 	for ( ; i < dotz; i++)
-		printf("=");
+		fprintf(stderr, "=");
 
 	// remaining part (spaces)
 	for ( ; i < BAR_WIDTH; i++)
-		printf(" ");
+		fprintf(stderr, " ");
 
 	// and back to line begin - do not forget the fflush to avoid output buffering problems!
-	printf("]\r");
-	fflush(stdout);
+	fprintf(stderr, "]\r");
+	fflush(stderr);
 
 	return 0;
 }
@@ -150,8 +150,10 @@ int aupload(AFILE *af)
 	fseek(af->file, 0, SEEK_SET);
 
 	res = curl_easy_perform(af->curl);
-	printf("\n"); /* do not continue in the same line as the progress bar */
-	
+
+	fprintf(stderr, "\e[2K");
+	fflush(stderr); /* do not continue in the same line as the progress bar */
+
 	fseek(af->file, pos, SEEK_SET); /* Restore old stream pointer */
 	
 	if (res != CURLE_OK)
@@ -166,11 +168,15 @@ int adownload(AFILE *af)
 {
 	CURLcode res;
 	long code;
+	int ret;
 
-	rewind(af->file);
+	fseek(af->file, 0, SEEK_SET);
 
 	res = curl_easy_perform(af->curl);
-	printf("\n"); /* do not continue in the same line as the progress bar */
+	
+	fprintf(stderr, "\e[2K");
+	fflush(stderr); /* do not continue in the same line as the progress bar */
+	
 	switch (res) {
 		case CURLE_OK:
 			curl_easy_getinfo(af->curl, CURLINFO_RESPONSE_CODE, &code);
@@ -210,7 +216,10 @@ notexist: /* File does not exist */
 
 	/* If we receive a 404, we discard the already received error page
 	 * and start with an empty file. */
-	ftruncate(fileno(af->file), 0);
+	fflush(af->file);
+	ret = ftruncate(fileno(af->file), 0);
+	if (ret)
+		return ret;
 
 exist: /* File exists */
 	if (af->mode[0] == 'a')
@@ -219,6 +228,6 @@ exist: /* File exists */
 		fseek(af->file, 0, SEEK_SET);
 	
 	sha1sum(af->file, af->hash);
-	
+
 	return 0;
 }
diff --git a/lib/fpga/ips/model.c b/lib/fpga/ips/model.c
index d97528ae0..4df61acc4 100644
--- a/lib/fpga/ips/model.c
+++ b/lib/fpga/ips/model.c
@@ -206,7 +206,9 @@ int model_init(struct fpga_ip *c)
 		ret = 0;
 
 	/* Set default values for parameters */
-	list_foreach(struct model_param *p, &m->parameters) {
+	for (size_t i = 0; i < list_length(&m->parameters); i++) {
+		struct model_param *p = list_at(&m->parameters, i);
+
 		p->ip = c;
 
 		if (p->direction == MODEL_PARAM_IN) {
@@ -243,7 +245,9 @@ void model_dump(struct fpga_ip *c)
 
 	{ INDENT
 		info("Parameters:");
-		list_foreach(struct model_param *p, &m->parameters) { INDENT
+		for (size_t i = 0; i < list_length(&m->parameters); i++) { INDENT
+			struct model_param *p = list_at(&m->parameters, i);
+			
 			if (p->direction == MODEL_PARAM_IN)
 				info("%#jx: %s (%s) = %.3f %s %u",
 					p->offset,
@@ -262,7 +266,9 @@ void model_dump(struct fpga_ip *c)
 		}
 
 		info("Infos:");
-		list_foreach(struct model_info *i, &m->infos) { INDENT
+		for (size_t j = 0; j < list_length(&m->infos); j++) { INDENT
+			struct model_info *i = list_at(&m->infos, j);
+
 			info("%s: %s", i->field, i->value);
 		}
 	}
diff --git a/lib/fpga/ips/switch.c b/lib/fpga/ips/switch.c
index 86964b63b..328b4ed30 100644
--- a/lib/fpga/ips/switch.c
+++ b/lib/fpga/ips/switch.c
@@ -58,7 +58,8 @@ int switch_init_paths(struct fpga_ip *c)
 	XAxisScr_RegUpdateDisable(xsw);
 	XAxisScr_MiPortDisableAll(xsw);
 	
-	list_foreach(struct sw_path *p, &sw->paths) {
+	for (size_t i = 0; i < list_length(&sw->paths); i++) {
+		struct sw_path *p = list_at(&sw->paths, i);
 		struct fpga_ip *mi, *si;
 		
 		mi = list_lookup(&c->card->ips, p->out);