[PATCH BlueZ v1 5/8] Replace the name2utf8 copies with str2utf8

[Luiz Augusto von Dentz <luiz.dentz@gmail.com>]

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

monitor/att.c, profiles/audio/mcp.c, profiles/gap/gas.c and src/eir.c
each carried their own name2utf8(), and src/shared/ad.c open coded the
same thing in ad_replace_name(), with none of them agreeing.

Use the shared helper instead, which drops around 120 lines and gives
every caller the same behaviour.

Two things change as a result. The monitor used to replace every
non-ASCII byte with a space as soon as one bad byte appeared, mangling
the valid part of the name, and now only the ill-formed sequences are
replaced. Everything else used to truncate at the first ill-formed
sequence, throwing away the rest of the name, and now keeps it.

The unit/test-eir expectations are updated accordingly, and they show
the improvement: the name that used to be reported as "test परी" is now
reported as "test परी<U+FFFD>्षा invalid".

str2utf8() returns memory from malloc(), so the callers that used
g_free() now use free().

Assisted-by: Claude:claude-opus-5
---
 monitor/att.c        | 66 ++++++++++++++------------------------------
 profiles/audio/mcp.c | 24 ++--------------
 profiles/gap/gas.c   | 20 ++------------
 src/eir.c            | 22 ++-------------
 src/shared/ad.c      | 20 ++++++--------
 unit/test-eir.c      |  7 +++--
 6 files changed, 40 insertions(+), 119 deletions(-)

diff --git a/monitor/att.c b/monitor/att.c
index 7506dc528e85..44965a2aaf3b 100644
--- a/monitor/att.c
+++ b/monitor/att.c
@@ -15,7 +15,6 @@
 #endif
 
 #define _GNU_SOURCE
-#include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -2325,40 +2324,15 @@ static void vol_flag_notify(const struct l2cap_frame *frame)
 	print_vcs_flag(frame);
 }
 
-static char *name2utf8(const uint8_t *name, uint16_t len)
-{
-	char utf8_name[HCI_MAX_NAME_LENGTH + 2];
-	int i;
-
-	if (g_utf8_validate((const char *) name, len, NULL))
-		return g_strndup((char *) name, len);
-
-	len = MIN(len, sizeof(utf8_name) - 1);
-
-	memset(utf8_name, 0, sizeof(utf8_name));
-	strncpy(utf8_name, (char *) name, len);
-
-	/* Assume ASCII, and replace all non-ASCII with spaces */
-	for (i = 0; utf8_name[i] != '\0'; i++) {
-		if (!isascii(utf8_name[i]))
-			utf8_name[i] = ' ';
-	}
-
-	/* Remove leading and trailing whitespace characters */
-	g_strstrip(utf8_name);
-
-	return g_strdup(utf8_name);
-}
-
 static void print_mp_name(const struct l2cap_frame *frame)
 {
 	char *name;
 
-	name = name2utf8((uint8_t *)frame->data, frame->size);
+	name = str2utf8(frame->data, frame->size);
 
 	print_field("  Media Player Name: %s", name);
 
-	g_free(name);
+	free(name);
 }
 
 static void mp_name_read(const struct l2cap_frame *frame)
@@ -2385,11 +2359,11 @@ static void print_track_title(const struct l2cap_frame *frame)
 {
 	char *name;
 
-	name = name2utf8((uint8_t *)frame->data, frame->size);
+	name = str2utf8(frame->data, frame->size);
 
 	print_field("  Track Title: %s", name);
 
-	g_free(name);
+	free(name);
 }
 
 static void track_title_read(const struct l2cap_frame *frame)
@@ -2520,11 +2494,11 @@ static void print_bearer_name(const struct l2cap_frame *frame)
 {
 	char *name;
 
-	name = name2utf8((uint8_t *)frame->data, frame->size);
+	name = str2utf8(frame->data, frame->size);
 
 	print_field("  Bearer Name: %s", name);
 
-	g_free(name);
+	free(name);
 }
 
 static void bearer_name_read(const struct l2cap_frame *frame)
@@ -2541,11 +2515,11 @@ static void bearer_uci_read(const struct l2cap_frame *frame)
 {
 	char *name;
 
-	name = name2utf8((uint8_t *)frame->data, frame->size);
+	name = str2utf8(frame->data, frame->size);
 
 	print_field("  Bearer Uci Name: %s", name);
 
-	g_free(name);
+	free(name);
 }
 
 static void print_technology_name(const struct l2cap_frame *frame)
@@ -2612,11 +2586,11 @@ static void print_uri_scheme_list(const struct l2cap_frame *frame)
 {
 	char *name;
 
-	name = name2utf8((uint8_t *)frame->data, frame->size);
+	name = str2utf8(frame->data, frame->size);
 
 	print_field("  Uri scheme Name: %s", name);
 
-	g_free(name);
+	free(name);
 }
 
 static void bearer_uri_schemes_list_read(const struct l2cap_frame *frame)
@@ -2726,11 +2700,11 @@ static void print_call_list(const struct l2cap_frame *frame)
 
 	print_field("  call_flag: 0x%x", call_flag);
 
-	call_uri = name2utf8((uint8_t *)frame->data, frame->size);
+	call_uri = str2utf8(frame->data, frame->size);
 
 	print_field("  call_uri: %s", call_uri);
 
-	g_free(call_uri);
+	free(call_uri);
 
 done:
 	if (frame->size)
@@ -2816,11 +2790,11 @@ static void print_target_uri(const struct l2cap_frame *frame)
 
 	print_field("  call_idx: %x", call_idx);
 
-	name = name2utf8((uint8_t *)frame->data, frame->size);
+	name = str2utf8(frame->data, frame->size);
 
 	print_field("  Uri: %s", name);
 
-	g_free(name);
+	free(name);
 
 done:
 	if (frame->size)
@@ -2928,9 +2902,9 @@ static void print_call_cp(const struct l2cap_frame *frame)
 		break;
 	case 0x04:
 		str = "Originate";
-		name = name2utf8((uint8_t *)frame->data, frame->size);
+		name = str2utf8(frame->data, frame->size);
 		print_field("  Operation: %s  Uri: %s", str, name);
-		g_free(name);
+		free(name);
 		break;
 	case 0x05:
 		str = "Join";
@@ -3124,11 +3098,11 @@ static void print_incom_call(const struct l2cap_frame *frame)
 
 	print_field("  Call Index: %u", call_id);
 
-	name = name2utf8((uint8_t *)frame->data, frame->size);
+	name = str2utf8(frame->data, frame->size);
 
 	print_field("  call_string: %s", name);
 
-	g_free(name);
+	free(name);
 
 done:
 	if (frame->size)
@@ -3157,11 +3131,11 @@ static void print_call_friendly_name(const struct l2cap_frame *frame)
 
 	print_field("  Call Index: %u", call_id);
 
-	name = name2utf8((uint8_t *)frame->data, frame->size);
+	name = str2utf8(frame->data, frame->size);
 
 	print_field("  Friendly Name: %s", name);
 
-	g_free(name);
+	free(name);
 
 done:
 	if (frame->size)
diff --git a/profiles/audio/mcp.c b/profiles/audio/mcp.c
index 0c2e0de0b156..8adf814e8d73 100644
--- a/profiles/audio/mcp.c
+++ b/profiles/audio/mcp.c
@@ -73,26 +73,6 @@ struct remote_player {
 	uint8_t playing_order;
 };
 
-static char *name2utf8(const uint8_t *name, uint16_t len)
-{
-	char *utf8_name;
-
-	utf8_name = malloc(len + 1);
-	if (!utf8_name)
-		return NULL;
-
-	if (len)
-		memcpy(utf8_name, name, len);
-
-	utf8_name[len] = 0;
-	strtoutf8(utf8_name, len);
-
-	/* Remove leading and trailing whitespace characters */
-	g_strstrip(utf8_name);
-
-	return utf8_name;
-}
-
 static const char *mcp_status_val_to_string(uint8_t status)
 {
 	switch (status) {
@@ -118,7 +98,7 @@ static void remote_media_player_name(void *data, const uint8_t *value,
 	struct remote_player *remote = data;
 	char *name;
 
-	name = name2utf8(value, length);
+	name = str2utf8(value, length);
 	if (!name)
 		return;
 
@@ -145,7 +125,7 @@ static void remote_track_title(void *data, const uint8_t *value,
 	char *name;
 	uint16_t len;
 
-	name = name2utf8(value, length);
+	name = str2utf8(value, length);
 	if (!name)
 		return;
 
diff --git a/profiles/gap/gas.c b/profiles/gap/gas.c
index 0f41c9e6c2a5..5184d74e8f07 100644
--- a/profiles/gap/gas.c
+++ b/profiles/gap/gas.c
@@ -66,22 +66,6 @@ static void gas_free(struct gas *gas)
 	g_free(gas);
 }
 
-static char *name2utf8(const uint8_t *name, uint16_t len)
-{
-	char utf8_name[HCI_MAX_NAME_LENGTH + 2];
-
-	len = MIN(len, sizeof(utf8_name) - 1);
-
-	memset(utf8_name, 0, sizeof(utf8_name));
-	strncpy(utf8_name, (char *) name, len);
-	strtoutf8(utf8_name, len);
-
-	/* Remove leading and trailing whitespace characters */
-	g_strstrip(utf8_name);
-
-	return g_strdup(utf8_name);
-}
-
 static void read_device_name_cb(bool success, uint8_t att_ecode,
 					const uint8_t *value, uint16_t length,
 					void *user_data)
@@ -98,13 +82,13 @@ static void read_device_name_cb(bool success, uint8_t att_ecode,
 	if (!length)
 		return;
 
-	name = name2utf8(value, length);
+	name = str2utf8(value, length);
 
 	DBG("GAP Device Name: %s", name);
 
 	btd_device_device_set_name(gas->device, name);
 
-	g_free(name);
+	free(name);
 }
 
 static void handle_device_name(struct gas *gas, uint16_t value_handle)
diff --git a/src/eir.c b/src/eir.c
index 95351d015323..5c9ebe2af3a3 100644
--- a/src/eir.c
+++ b/src/eir.c
@@ -60,7 +60,7 @@ void eir_data_free(struct eir_data *eir)
 {
 	queue_destroy(eir->services, g_free);
 	eir->services = NULL;
-	g_free(eir->name);
+	free(eir->name);
 	eir->name = NULL;
 	free(eir->hash);
 	eir->hash = NULL;
@@ -133,22 +133,6 @@ static void eir_parse_uuid128(struct eir_data *eir, const uint8_t *data,
 	}
 }
 
-static char *name2utf8(const uint8_t *name, uint8_t len)
-{
-	char utf8_name[HCI_MAX_NAME_LENGTH + 2];
-
-	len = MIN(len, sizeof(utf8_name) - 1);
-
-	memset(utf8_name, 0, sizeof(utf8_name));
-	strncpy(utf8_name, (char *) name, len);
-	strtoutf8(utf8_name, len);
-
-	/* Remove leading and trailing whitespace characters */
-	g_strstrip(utf8_name);
-
-	return g_strdup(utf8_name);
-}
-
 static void eir_parse_msd(struct eir_data *eir, const uint8_t *data,
 								uint8_t len)
 {
@@ -301,9 +285,9 @@ void eir_parse(struct eir_data *eir, const uint8_t *eir_data, uint8_t eir_len)
 			while (data_len > 0 && data[data_len - 1] == '\0')
 				data_len--;
 
-			g_free(eir->name);
+			free(eir->name);
 
-			eir->name = name2utf8(data, data_len);
+			eir->name = str2utf8(data, data_len);
 			eir->name_complete = eir_data[1] != EIR_NAME_SHORT;
 			break;
 
diff --git a/src/shared/ad.c b/src/shared/ad.c
index b1d1b84611aa..236e719507e4 100644
--- a/src/shared/ad.c
+++ b/src/shared/ad.c
@@ -275,22 +275,18 @@ static bool ad_replace_uuid128(struct bt_ad *ad, struct iovec *iov)
 
 static bool ad_replace_name(struct bt_ad *ad, struct iovec *iov)
 {
-	char utf8_name[HCI_MAX_NAME_LENGTH + 2];
+	char *utf8_name;
+	bool ret;
 
-	memset(utf8_name, 0, sizeof(utf8_name));
-	strncpy(utf8_name, (const char *)iov->iov_base,
-			MIN(iov->iov_len, HCI_MAX_NAME_LENGTH));
+	utf8_name = str2utf8(iov->iov_base, iov->iov_len);
+	if (!utf8_name)
+		return false;
 
-	if (strisutf8(utf8_name, iov->iov_len))
-		goto done;
+	ret = bt_ad_add_name(ad, utf8_name);
 
-	strtoutf8(utf8_name, iov->iov_len);
+	free(utf8_name);
 
-	/* Remove leading and trailing whitespace characters */
-	strstrip(utf8_name);
-
-done:
-	return bt_ad_add_name(ad, utf8_name);
+	return ret;
 }
 
 static bool ad_replace_uuid16_data(struct bt_ad *ad, struct iovec *iov)
diff --git a/unit/test-eir.c b/unit/test-eir.c
index 62164ca993f6..a4b6743e48b7 100644
--- a/unit/test-eir.c
+++ b/unit/test-eir.c
@@ -407,7 +407,8 @@ static const unsigned char invalid_utf8_name_data[] = {
 static const struct test_data invalid_utf8_name_test = {
 	.eir_data = invalid_utf8_name_data,
 	.eir_size = sizeof(invalid_utf8_name_data),
-	.name = "test परी",
+	/* The truncated sequence is replaced by U+FFFD, the rest is kept */
+	.name = "test परी" "\xef\xbf\xbd" "्षा invalid",
 	.name_complete = true,
 	.tx_power = 127,
 };
@@ -435,7 +436,9 @@ static const unsigned char iso_2022_jp_name_data[] = {
 static const struct test_data iso_2022_jp_name_test = {
 	.eir_data = iso_2022_jp_name_data,
 	.eir_size = sizeof(iso_2022_jp_name_data),
-	.name = "test \033$B",
+	/* The 4 JIS bytes are replaced by U+FFFD, the escapes are ASCII */
+	.name = "test \033$B" "\xef\xbf\xbd\xef\xbf\xbd\xef\xbf\xbd\xef\xbf\xbd"
+								"\033(B OK",
 	.name_complete = true,
 	.tx_power = 127,
 };
-- 
2.54.0