From 3ffc1222bd2c30b0ef2d3a797b0e0070c7c61a98 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Mon, 21 Mar 2011 12:00:00 +0100 Subject: [PATCH] ALSA: usb - Remove trailing spaces from USB card name strings Some USB devices give trailing spaces in strings returned from usb_string(). This confuses the automatic card-id creation, resulting always in "default". This patch fixes the behavior by removing trailing spaces. Signed-off-by: Takashi Iwai --- sound/usb/card.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/sound/usb/card.c b/sound/usb/card.c index 40722f8711ad..a90662af2d6b 100644 --- a/sound/usb/card.c +++ b/sound/usb/card.c @@ -41,6 +41,7 @@ #include #include #include +#include #include #include #include @@ -283,6 +284,15 @@ static int snd_usb_audio_dev_free(struct snd_device *device) return snd_usb_audio_free(chip); } +static void remove_trailing_spaces(char *str) +{ + char *p; + + if (!*str) + return; + for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--) + *p = 0; +} /* * create a chip instance and set its names. @@ -351,7 +361,7 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx, snd_component_add(card, component); /* retrieve the device string as shortname */ - if (quirk && quirk->product_name) { + if (quirk && quirk->product_name && *quirk->product_name) { strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); } else { if (!dev->descriptor.iProduct || @@ -363,9 +373,10 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx, USB_ID_PRODUCT(chip->usb_id)); } } + remove_trailing_spaces(card->shortname); /* retrieve the vendor and device strings as longname */ - if (quirk && quirk->vendor_name) { + if (quirk && quirk->vendor_name && *quirk->vendor_name) { len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); } else { if (dev->descriptor.iManufacturer) @@ -375,8 +386,11 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx, len = 0; /* we don't really care if there isn't any vendor string */ } - if (len > 0) - strlcat(card->longname, " ", sizeof(card->longname)); + if (len > 0) { + remove_trailing_spaces(card->longname); + if (*card->longname) + strlcat(card->longname, " ", sizeof(card->longname)); + } strlcat(card->longname, card->shortname, sizeof(card->longname)); -- 2.34.1