command_handler_t: make argc unsigned

The number of command arguments will always be 0 or more, so use
the right type in handlers.  This has a cascading effect up through
the layers, but the new COMMAND_HANDLER macros prevented total chaos.

src/flash/cfi.c

@@ -604,9 +604,6 @@ static int cfi_register_commands(struct command_context_s *cmd_ctx)
 FLASH_BANK_COMMAND_HANDLER(cfi_flash_bank_command)
 {
 	cfi_flash_bank_t *cfi_info;
-	int i;
-	(void) cmd_ctx;
-	(void) cmd;
 
 	if (argc < 6)
 	{
@@ -635,7 +632,7 @@ FLASH_BANK_COMMAND_HANDLER(cfi_flash_bank_command)
 	cfi_info->jedec_probe = 0;
 	cfi_info->not_cfi = 0;
 
-	for (i = 6; i < argc; i++)
+	for (unsigned i = 6; i < argc; i++)
 	{
 		if (strcmp(args[i], "x16_as_x8") == 0)
 		{

src/flash/nand.c

@@ -1315,8 +1315,7 @@ COMMAND_HANDLER(handle_nand_write_command)
 
 	if (argc > 3)
 	{
-		int i;
+		for (unsigned i = 3; i < argc; i++)
-		for (i = 3; i < argc; i++)
 		{
 			if (!strcmp(args[i], "oob_raw"))
 				oob_format |= NAND_OOB_RAW;
@@ -1485,8 +1484,7 @@ COMMAND_HANDLER(handle_nand_dump_command)
 
 	if (argc > 4)
 	{
-		int i;
+		for (unsigned i = 4; i < argc; i++)
-		for (i = 4; i < argc; i++)
 		{
 			if (!strcmp(args[i], "oob_raw"))
 				oob_format |= NAND_OOB_RAW;

src/helper/command.h

@@ -88,7 +88,7 @@ typedef struct command_context_s
  */
 #define __COMMAND_HANDLER(name, extra...) \
 		int name(struct command_context_s *cmd_ctx, \
-				char *cmd, char **args, int argc, ##extra)
+				char *cmd, char **args, unsigned argc, ##extra)
 
 /**
  * Use this to macro to call a command helper (or a nested handler).

src/helper/ioutil.c

@@ -214,9 +214,9 @@ COMMAND_HANDLER(handle_append_command)
 	config_file = fopen(args[0], "a");
 	if (config_file != NULL)
 	{
-		int i;
 		fseek(config_file, 0, SEEK_END);
 
+		unsigned i;
 		for (i = 1; i < argc; i++)
 		{
 			if (fwrite(args[i], 1, strlen(args[i]), config_file) != strlen(args[i]))

src/jtag/ft2232.c

@@ -2874,8 +2874,7 @@ COMMAND_HANDLER(ft2232_handle_vid_pid_command)
 		argc -= 1;
 	}
 
-	int i;
+	unsigned i;
-	int retval = ERROR_OK;
 	for (i = 0; i < argc; i += 2)
 	{
 		COMMAND_PARSE_NUMBER(u16, args[i], ft2232_vid[i >> 1]);
@@ -2888,7 +2887,7 @@ COMMAND_HANDLER(ft2232_handle_vid_pid_command)
 	 */
 	ft2232_vid[i >> 1] = ft2232_pid[i >> 1] = 0;
 
-	return retval;
+	return ERROR_OK;
 }
 
 COMMAND_HANDLER(ft2232_handle_latency_command)

src/svf/svf.c

@@ -304,7 +304,7 @@ int svf_add_statemove(tap_state_t state_to)
 COMMAND_HANDLER(handle_svf_command)
 {
 #define SVF_NUM_OF_OPTIONS			1
-	int command_num = 0, i;
+	int command_num = 0;
 	int ret = ERROR_OK;
 	long long time_ago;
 
@@ -316,7 +316,7 @@ COMMAND_HANDLER(handle_svf_command)
 
 	// parse variant
 	svf_quiet = 0;
-	for (i = 1; i < argc; i++)
+	for (unsigned i = 1; i < argc; i++)
 	{
 		if (!strcmp(args[i], "quiet"))
 		{

src/target/arm9tdmi.c

@@ -862,7 +862,6 @@ COMMAND_HANDLER(handle_arm9tdmi_catch_vectors_command)
 	struct arm7_9_common_s *arm7_9 = target_to_arm7_9(target);
 	reg_t *vector_catch;
 	uint32_t vector_catch_value;
-	int i, j;
 
 	/* it's uncommon, but some ARM7 chips can support this */
 	if (arm7_9->common_magic != ARM7_9_COMMON_MAGIC
@@ -894,9 +893,10 @@ COMMAND_HANDLER(handle_arm9tdmi_catch_vectors_command)
 		}
 		else
 		{
-			for (i = 0; i < argc; i++)
+			for (unsigned i = 0; i < argc; i++)
 			{
 				/* go through list of vectors */
+				unsigned j;
 				for (j = 0; arm9tdmi_vectors[j].name; j++)
 				{
 					if (strcmp(args[i], arm9tdmi_vectors[j].name) == 0)
@@ -927,7 +927,7 @@ COMMAND_HANDLER(handle_arm9tdmi_catch_vectors_command)
 	}
 
 	/* output current settings */
-	for (i = 0; arm9tdmi_vectors[i].name; i++) {
+	for (unsigned i = 0; arm9tdmi_vectors[i].name; i++) {
 		command_print(cmd_ctx, "%s: %s", arm9tdmi_vectors[i].name,
 			(vector_catch_value & arm9tdmi_vectors[i].value)
 				? "catch" : "don't catch");