Remove extra spaces from mixers before processing them. This gives us some...

Remove extra spaces from mixers before processing them. This gives us some more working space on IO for mixer processing.

apps/systemcmds/mixer/mixer.c

@@ -117,7 +117,23 @@ load(const char *devname, const char *fname)
 		if ((strlen(line) < 2) || !isupper(line[0]) || (line[1] != ':'))
 			continue;
 
-		/* XXX an optimisation here would be to strip extra whitespace */
+		/* compact whitespace in the buffer */
+		char *t, *f;
+		for (f = buf; *f != '\0'; f++) {
+			/* scan for space characters */
+			if (*f == ' ') {
+				/* look for additional spaces */
+				t = f + 1;
+				while (*t == ' ')
+					t++;
+				if (*t == '\0') {
+					/* strip trailing whitespace */
+					*f = '\0';
+				} else if (t > (f + 1)) {
+					memmove(f + 1, t, strlen(t) + 1);
+				}
+			}
+		}
 
 		/* if the line is too long to fit in the buffer, bail */
 		if ((strlen(line) + strlen(buf) + 1) >= sizeof(buf))