Fix up this local copy of statfoo to support > 128 statistics.

This allows all of the athstats statistics to work again.

Specifics:

* The previous code used chars < 0x80 as printable, and chars >= 0x80
  as "statistics"
* .. which meant any statistic above 127 would wrap around to 0;
* .. so once I added the 802.11n TX/RX statistics to athstats, the tail
  end of the statistics list weren't accessible.

This patch:

* adds a define which represents the magic character, rather than a hard
  coded one
* the statistic in question is little endian encoded after the magic
  character.

Notes:

* statfoo is useful enough to possibly warrant turning into a library API.

2 files changed, 24 insertions, 9 deletions

diff --git a/tools/tools/ath/athstats/statfoo.c b/tools/tools/ath/athstats/statfoo.c
index 9963ea0..eb39e25 100644
--- a/tools/tools/ath/athstats/statfoo.c
+++ b/tools/tools/ath/athstats/statfoo.c
@@ -60,7 +60,9 @@ statfoo_setfmt(struct statfoo *sf, const char *fmt0)
 		}
 		if (j != 0)
 			sf->fmts[j++] = ' ';
-		sf->fmts[j++] = 0x80 | i;
+		sf->fmts[j++] = FMTS_IS_STAT;
+		sf->fmts[j++] = i & 0xff;
+		sf->fmts[j++] = (i >> 8) & 0xff;
 	}
 	sf->fmts[j] = '\0';
 #undef N
@@ -89,10 +91,14 @@ static void
 statfoo_print_header(struct statfoo *sf, FILE *fd)
 {
 	const unsigned char *cp;
+	int i;
+	const struct fmt *f;
 
 	for (cp = sf->fmts; *cp != '\0'; cp++) {
-		if (*cp & 0x80) {
-			const struct fmt *f = &sf->stats[*cp &~ 0x80];
+		if (*cp == FMTS_IS_STAT) {
+			i = *(++cp);
+			i |= ((int) *(++cp)) << 8;
+			f = &sf->stats[i];
 			fprintf(fd, "%*s", f->width, f->label);
 		} else
 			putc(*cp, fd);
@@ -105,11 +111,15 @@ statfoo_print_current(struct statfoo *sf, FILE *fd)
 {
 	char buf[32];
 	const unsigned char *cp;
+	int i;
+	const struct fmt *f;
 
 	for (cp = sf->fmts; *cp != '\0'; cp++) {
-		if (*cp & 0x80) {
-			const struct fmt *f = &sf->stats[*cp &~ 0x80];
-			if (sf->get_curstat(sf, *cp &~ 0x80, buf, sizeof(buf)))
+		if (*cp == FMTS_IS_STAT) {
+			i = *(++cp);
+			i |= ((int) *(++cp)) << 8;
+			f = &sf->stats[i];
+			if (sf->get_curstat(sf, i, buf, sizeof(buf)))
 				fprintf(fd, "%*s", f->width, buf);
 		} else
 			putc(*cp, fd);
@@ -122,11 +132,15 @@ statfoo_print_total(struct statfoo *sf, FILE *fd)
 {
 	char buf[32];
 	const unsigned char *cp;
+	const struct fmt *f;
+	int i;
 
 	for (cp = sf->fmts; *cp != '\0'; cp++) {
-		if (*cp & 0x80) {
-			const struct fmt *f = &sf->stats[*cp &~ 0x80];
-			if (sf->get_totstat(sf, *cp &~ 0x80, buf, sizeof(buf)))
+		if (*cp == FMTS_IS_STAT) {
+			i = *(++cp);
+			i |= ((int) *(++cp)) << 8;
+			f = &sf->stats[i];
+			if (sf->get_totstat(sf, i, buf, sizeof(buf)))
 				fprintf(fd, "%*s", f->width, buf);
 		} else
 			putc(*cp, fd);
diff --git a/tools/tools/ath/athstats/statfoo.h b/tools/tools/ath/athstats/statfoo.h
index df7eb7a..849a271 100644
--- a/tools/tools/ath/athstats/statfoo.h
+++ b/tools/tools/ath/athstats/statfoo.h
@@ -79,6 +79,7 @@ struct statfoo {
 	const char *name;		/* statistics name, e.g. wlanstats */
 	const struct fmt *stats;	/* statistics in class */
 	int nstats;			/* number of stats */
+#define	FMTS_IS_STAT	0x80	/* the following two bytes are the stat id */
 	unsigned char fmts[4096];	/* private: compiled stats to display */
 
 	STATFOO_DECL_METHODS(struct statfoo *);