ALSA: introduce snd_print_pcm_rates()

We want to share some code with print_pcm_rates(),
so extract a common routine snd_print_pcm_rates() from it.

Signed-off-by: Wu Fengguang <wfg@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 17 insertions, 6 deletions

diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index aac569b05599..d7e3a164effe 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -284,6 +284,9 @@ int snd_hda_codec_proc_new(struct hda_codec *codec);
 static inline int snd_hda_codec_proc_new(struct hda_codec *codec) { return 0; }
 #endif
 
+#define SND_PRINT_RATES_ADVISED_BUFSIZE 80
+void snd_print_pcm_rates(int pcm, char *buf, int buflen);
+
 /*
  * Misc
  */
diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
index 64b6a38fa963..512eb674b743 100644
--- a/sound/pci/hda/hda_proc.c
+++ b/sound/pci/hda/hda_proc.c
@@ -89,20 +89,28 @@ static void print_amp_vals(struct snd_info_buffer *buffer,
         snd_iprintf(buffer, "\n");
 }
 
-static void print_pcm_rates(struct snd_info_buffer *buffer, unsigned int pcm)
+void snd_print_pcm_rates(int pcm, char *buf, int buflen)
 {
         static unsigned int rates[] = {
                 8000, 11025, 16000, 22050, 32000, 44100, 48000, 88200,
                 96000, 176400, 192000, 384000
         };
-        int i;
+        int i, j;
+
+        for (i = 0, j = 0; i < ARRAY_SIZE(rates); i++)
+                if (pcm & (1 << i))
+                        j += snprintf(buf + j, buflen - j,  " %d", rates[i]);
+
+        buf[j] = '\0'; /* necessary when j == 0 */
+}
 
+static void print_pcm_rates(struct snd_info_buffer *buffer, unsigned int pcm)
+{
+        char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
         pcm &= AC_SUPPCM_RATES;
         snd_iprintf(buffer, "    rates [0x%x]:", pcm);
-        for (i = 0; i < ARRAY_SIZE(rates); i++) 
-                if (pcm & (1 << i))
-                        snd_iprintf(buffer, " %d", rates[i]);
-        snd_iprintf(buffer, "\n");
+        snd_print_pcm_rates(pcm, buf, sizeof(buf));
+        snd_iprintf(buffer, "%s\n", buf);
 }
 
 static void print_pcm_bits(struct snd_info_buffer *buffer, unsigned int pcm)