openocd: manually remove NULL comparisons

For the remaining NULL comparisons, remove then manually.

While there, make more readable a loop, by moving the assigment
out of the loop condition.

Change-Id: I44193aaa95813156a3a79c16b80e1ad333dc1eaf
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/6353
Tested-by: jenkins

src/flash/nor/tcl.c

@@ -1276,7 +1276,7 @@ COMMAND_HANDLER(handle_flash_bank_command)
 	}
 
 	/* check the flash bank name is unique */
-	if (get_flash_bank_by_name_noprobe(bank_name) != NULL) {
+	if (get_flash_bank_by_name_noprobe(bank_name)) {
 		/* flash bank name already exists  */
 		LOG_ERROR("flash bank name '%s' already exists", bank_name);
 		return ERROR_FAIL;

src/helper/command.c

@@ -815,9 +815,9 @@ static COMMAND_HELPER(command_help_show, struct help_entry *c,
 
 	/* If the match string occurs anywhere, we print out
 	 * stuff for this command. */
-	bool is_match = (strstr(c->cmd_name, cmd_match) != NULL) ||
-		((c->usage) && (strstr(c->usage, cmd_match) != NULL)) ||
-		((c->help) && (strstr(c->help, cmd_match) != NULL));
+	bool is_match = strstr(c->cmd_name, cmd_match) ||
+		(c->usage && strstr(c->usage, cmd_match)) ||
+		(c->help && strstr(c->help, cmd_match));
 
 	if (is_match) {
 		if (c->usage && strlen(c->usage) > 0) {

src/helper/fileio.c

@@ -208,7 +208,7 @@ int fileio_read_u32(struct fileio *fileio, uint32_t *data)
 
 static int fileio_local_fgets(struct fileio *fileio, size_t size, void *buffer)
 {
-	if (fgets(buffer, size, fileio->file) == NULL)
+	if (!fgets(buffer, size, fileio->file))
 		return ERROR_FILEIO_OPERATION_FAILED;
 
 	return ERROR_OK;

src/jtag/aice/aice_usb.c

@@ -2218,7 +2218,7 @@ static int aice_execute_custom_script(const char *script)
 	if (!script_fd) {
 		return ERROR_FAIL;
 	} else {
-		while (fgets(line_buffer, LINE_BUFFER_SIZE, script_fd) != NULL) {
+		while (fgets(line_buffer, LINE_BUFFER_SIZE, script_fd)) {
 			/* execute operations */
 			set_op = false;
 			op_str = strstr(line_buffer, "set");

src/jtag/core.c

@@ -1336,7 +1336,6 @@ out:
 static int jtag_validate_ircapture(void)
 {
 	struct jtag_tap *tap;
-	int total_ir_length = 0;
 	uint8_t *ir_test = NULL;
 	struct scan_field field;
 	uint64_t val;
@@ -1344,11 +1343,12 @@ static int jtag_validate_ircapture(void)
 	int retval;
 
 	/* when autoprobing, accommodate huge IR lengths */
-	for (tap = NULL, total_ir_length = 0;
-			(tap = jtag_tap_next_enabled(tap)) != NULL;
-			total_ir_length += tap->ir_length) {
+	int total_ir_length = 0;
+	for (tap = jtag_tap_next_enabled(NULL); tap; tap = jtag_tap_next_enabled(tap)) {
 		if (tap->ir_length == 0)
 			total_ir_length += JTAG_IRLEN_MAX;
+		else
+			total_ir_length += tap->ir_length;
 	}
 
 	/* increase length to add 2 bit sentinel after scan */
@@ -2008,7 +2008,7 @@ bool transport_is_jtag(void)
 
 int adapter_resets(int trst, int srst)
 {
-	if (get_current_transport() == NULL) {
+	if (!get_current_transport()) {
 		LOG_ERROR("transport is not selected");
 		return ERROR_FAIL;
 	}
@@ -2065,7 +2065,7 @@ int adapter_assert_reset(void)
 			   transport_is_dapdirect_jtag() || transport_is_dapdirect_swd() ||
 			   transport_is_swim())
 		return adapter_system_reset(1);
-	else if (get_current_transport() != NULL)
+	else if (get_current_transport())
 		LOG_ERROR("reset is not supported on %s",
 			get_current_transport()->name);
 	else
@@ -2082,7 +2082,7 @@ int adapter_deassert_reset(void)
 			   transport_is_dapdirect_jtag() || transport_is_dapdirect_swd() ||
 			   transport_is_swim())
 		return adapter_system_reset(0);
-	else if (get_current_transport() != NULL)
+	else if (get_current_transport())
 		LOG_ERROR("reset is not supported on %s",
 			get_current_transport()->name);
 	else

src/jtag/drivers/rlink.c

@@ -1148,11 +1148,8 @@ static int rlink_scan(struct jtag_command *cmd, enum scan_type type,
 		byte_bits -= chunk_bits;
 
 		if (type != SCAN_OUT) {
-			if (dtc_queue_enqueue_reply(
-					type, buffer, scan_size, tdi_bit_offset,
-					chunk_bits,
-					cmd
-				) == NULL) {
+			if (!dtc_queue_enqueue_reply(type, buffer, scan_size, tdi_bit_offset,
+					chunk_bits, cmd)) {
 				LOG_ERROR("enqueuing DTC reply entry: %s", strerror(errno));
 				exit(1);
 			}
@@ -1208,11 +1205,8 @@ static int rlink_scan(struct jtag_command *cmd, enum scan_type type,
 		 * and one reply byte */
 		dtc_queue_run_if_full(type == SCAN_IN ? 1 : 2, 1);
 
-		if (dtc_queue_enqueue_reply(
-				type, buffer, scan_size, tdi_bit_offset,
-				extra_bits,
-				cmd
-			) == NULL) {
+		if (!dtc_queue_enqueue_reply(type, buffer, scan_size, tdi_bit_offset,
+				extra_bits, cmd)) {
 			LOG_ERROR("enqueuing DTC reply entry: %s", strerror(errno));
 			exit(1);
 		}
@@ -1260,11 +1254,8 @@ static int rlink_scan(struct jtag_command *cmd, enum scan_type type,
 			DTC_CMD_SHIFT_TMS_TDI_BIT_PAIR(1, (*tdi_p & tdi_mask), 0);
 
 	} else {
-		if (dtc_queue_enqueue_reply(
-				type, buffer, scan_size, tdi_bit_offset,
-				1,
-				cmd
-				) == NULL) {
+		if (!dtc_queue_enqueue_reply(type, buffer, scan_size, tdi_bit_offset,
+				1, cmd)) {
 			LOG_ERROR("enqueuing DTC reply entry: %s", strerror(errno));
 			exit(1);
 		}

src/jtag/drivers/vsllink.c

@@ -803,7 +803,7 @@ static int vsllink_check_usb_strings(
 	if (retval < 0)
 		return ERROR_FAIL;
 
-	if (strstr(desc_string, "Versaloon") == NULL)
+	if (!strstr(desc_string, "Versaloon"))
 		return ERROR_FAIL;
 
 	return ERROR_OK;

src/server/telnet_server.c

@@ -159,7 +159,7 @@ static void telnet_load_history(struct telnet_connection *t_con)
 
 	if (histfp) {
 
-		while (fgets(buffer, sizeof(buffer), histfp) != NULL) {
+		while (fgets(buffer, sizeof(buffer), histfp)) {
 
 			char *p = strchr(buffer, '\n');
 			if (p)

src/target/target.c

@@ -484,7 +484,7 @@ struct target *get_target(const char *id)
 
 	/* try as tcltarget name */
 	for (target = all_targets; target; target = target->next) {
-		if (target_name(target) == NULL)
+		if (!target_name(target))
 			continue;
 		if (strcmp(id, target_name(target)) == 0)
 			return target;

src/target/target_request.c

@@ -262,7 +262,7 @@ COMMAND_HANDLER(handle_target_request_debugmsgs_command)
 	}
 
 	/* see if receiver is already registered */
-	if (find_debug_msg_receiver(CMD_CTX, target) != NULL)
+	if (find_debug_msg_receiver(CMD_CTX, target))
 		receiving = 1;
 
 	if (CMD_ARGC > 0) {