decoder: rename iteration variables to improve readability

Use longer variable names for the iteration over channels, options,
annotation classes and rows, and binary classes when a decoder gets
loaded. This improves readability, especially in nested loops with
complex test conditions and diagnostics messages.

Although the Python variables were checked for their availability and
expected data type, and we should only see non-negative index values,
the iteration variable's data type remains unchanged in this commit
(sticks with signed size types).

1 files changed, 27 insertions, 22 deletions

diff --git a/decoder.c b/decoder.c
index cc0a1e1..dd3bd5a 100644
--- a/decoder.c
+++ b/decoder.c
@@ -199,7 +199,7 @@ static int get_channels(const struct srd_decoder *d, const char *attr,
 	PyObject *py_channellist, *py_entry;
 	struct srd_channel *pdch;
 	GSList *pdchl;
-	ssize_t i;
+	ssize_t ch_idx;
 	PyGILState_STATE gstate;
 
 	gstate = PyGILState_Ensure();
@@ -222,8 +222,9 @@ static int get_channels(const struct srd_decoder *d, const char *attr,
 		goto err_out;
 	}
 
-	for (i = PyTuple_Size(py_channellist) - 1; i >= 0; i--) {
-		py_entry = PyTuple_GetItem(py_channellist, i);
+	ch_idx = PyTuple_Size(py_channellist);
+	while (ch_idx--) {
+		py_entry = PyTuple_GetItem(py_channellist, ch_idx);
 		if (!py_entry)
 			goto except_out;
 
@@ -243,7 +244,7 @@ static int get_channels(const struct srd_decoder *d, const char *attr,
 		if (py_dictitem_as_str(py_entry, "desc", &pdch->desc) != SRD_OK)
 			goto err_out;
 
-		pdch->order = offset + i;
+		pdch->order = offset + ch_idx;
 	}
 
 	Py_DECREF(py_channellist);
@@ -271,7 +272,7 @@ static int get_options(struct srd_decoder *d)
 	GSList *options;
 	struct srd_decoder_option *o;
 	GVariant *gvar;
-	ssize_t opt, i;
+	ssize_t opt, val_idx;
 	PyGILState_STATE gstate;
 
 	gstate = PyGILState_Ensure();
@@ -351,8 +352,9 @@ static int get_options(struct srd_decoder *d)
 				goto err_out;
 			}
 
-			for (i = PyTuple_Size(py_values) - 1; i >= 0; i--) {
-				py_item = PyTuple_GetItem(py_values, i);
+			val_idx = PyTuple_Size(py_values);
+			while (val_idx--) {
+				py_item = PyTuple_GetItem(py_values, val_idx);
 				if (!py_item)
 					goto except_out;
 
@@ -396,7 +398,7 @@ static int get_annotations(struct srd_decoder *dec, size_t *ret_count)
 	PyObject *py_annlist, *py_ann;
 	GSList *annotations;
 	char **annpair;
-	ssize_t i;
+	ssize_t ann_idx;
 	PyGILState_STATE gstate;
 
 	if (ret_count)
@@ -421,17 +423,17 @@ static int get_annotations(struct srd_decoder *dec, size_t *ret_count)
 		goto err_out;
 	}
 
-	i = PyTuple_Size(py_annlist);
+	ann_idx = PyTuple_Size(py_annlist);
 	if (ret_count)
-		*ret_count = i;
-	while (i--) {
-		py_ann = PyTuple_GetItem(py_annlist, i);
+		*ret_count = ann_idx;
+	while (ann_idx--) {
+		py_ann = PyTuple_GetItem(py_annlist, ann_idx);
 		if (!py_ann)
 			goto except_out;
 
 		if (!PyTuple_Check(py_ann) || PyTuple_Size(py_ann) != 2) {
 			srd_err("Protocol decoder %s annotation %zd should be a tuple with two elements.",
-				dec->name, i + 1);
+				dec->name, ann_idx + 1);
 			goto err_out;
 		}
 		if (py_strseq_to_char(py_ann, &annpair) != SRD_OK)
@@ -464,7 +466,7 @@ static int get_annotation_rows(struct srd_decoder *dec, size_t cls_count)
 	PyObject *py_ann_rows, *py_ann_row, *py_ann_classes, *py_item;
 	GSList *annotation_rows;
 	struct srd_decoder_annotation_row *ann_row;
-	ssize_t i, k;
+	ssize_t row_idx, item_idx;
 	size_t class_idx;
 	PyGILState_STATE gstate;
 
@@ -487,8 +489,9 @@ static int get_annotation_rows(struct srd_decoder *dec, size_t cls_count)
 		goto err_out;
 	}
 
-	for (i = PyTuple_Size(py_ann_rows) - 1; i >= 0; i--) {
-		py_ann_row = PyTuple_GetItem(py_ann_rows, i);
+	row_idx = PyTuple_Size(py_ann_rows);
+	while (row_idx--) {
+		py_ann_row = PyTuple_GetItem(py_ann_rows, row_idx);
 		if (!py_ann_row)
 			goto except_out;
 
@@ -523,8 +526,9 @@ static int get_annotation_rows(struct srd_decoder *dec, size_t cls_count)
 			goto err_out;
 		}
 
-		for (k = PyTuple_Size(py_ann_classes) - 1; k >= 0; k--) {
-			py_item = PyTuple_GetItem(py_ann_classes, k);
+		item_idx = PyTuple_Size(py_ann_classes);
+		while (item_idx--) {
+			py_item = PyTuple_GetItem(py_ann_classes, item_idx);
 			if (!py_item)
 				goto except_out;
 
@@ -538,7 +542,7 @@ static int get_annotation_rows(struct srd_decoder *dec, size_t cls_count)
 				goto except_out;
 			if (class_idx >= cls_count) {
 				srd_err("Protocol decoder %s annotation row %zd references invalid class %zu.",
-					dec->name, i, class_idx);
+					dec->name, row_idx, class_idx);
 				goto err_out;
 			}
 
@@ -570,7 +574,7 @@ static int get_binary_classes(struct srd_decoder *dec)
 	PyObject *py_bin_classes, *py_bin_class;
 	GSList *bin_classes;
 	char **bin;
-	ssize_t i;
+	ssize_t bin_idx;
 	PyGILState_STATE gstate;
 
 	gstate = PyGILState_Ensure();
@@ -592,8 +596,9 @@ static int get_binary_classes(struct srd_decoder *dec)
 		goto err_out;
 	}
 
-	for (i = PyTuple_Size(py_bin_classes) - 1; i >= 0; i--) {
-		py_bin_class = PyTuple_GetItem(py_bin_classes, i);
+	bin_idx = PyTuple_Size(py_bin_classes);
+	while (bin_idx--) {
+		py_bin_class = PyTuple_GetItem(py_bin_classes, bin_idx);
 		if (!py_bin_class)
 			goto except_out;