[PATCH 1/3] perf report: Relax -g option parsing not to limit the option order

[Namhyung Kim <namhyung@kernel.org>]

Current perf report -g/--call-graph option parser requires for option
argument having following order:

  type,min_percent[,print_limit],order,key

But sometimes it's annoying to type all even if one just wants to
change the "order" or "key" setting.

This patch fixes it to remove the ordering restriction so that one can
use just "-g caller", for instance.  The only remaining restriction is
that the "print_limit" always comes after the "min_percent".

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/callchain.c | 95 ++++++++++++++++++---------------------------
 1 file changed, 38 insertions(+), 57 deletions(-)

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 437ee09727e6..08f0fbf5527c 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -28,74 +28,55 @@ __thread struct callchain_cursor callchain_cursor;
 int
 parse_callchain_report_opt(const char *arg)
 {
-	char *tok, *tok2;
+	char *tok;
 	char *endptr;
+	bool minpcnt_set = false;
 
 	symbol_conf.use_callchain = true;
 
 	if (!arg)
 		return 0;
 
-	tok = strtok((char *)arg, ",");
-	if (!tok)
-		return -1;
-
-	/* get the output mode */
-	if (!strncmp(tok, "graph", strlen(arg))) {
-		callchain_param.mode = CHAIN_GRAPH_ABS;
-
-	} else if (!strncmp(tok, "flat", strlen(arg))) {
-		callchain_param.mode = CHAIN_FLAT;
-	} else if (!strncmp(tok, "fractal", strlen(arg))) {
-		callchain_param.mode = CHAIN_GRAPH_REL;
-	} else if (!strncmp(tok, "none", strlen(arg))) {
-		callchain_param.mode = CHAIN_NONE;
-		symbol_conf.use_callchain = false;
-		return 0;
-	} else {
-		return -1;
-	}
-
-	/* get the min percentage */
-	tok = strtok(NULL, ",");
-	if (!tok)
-		goto setup;
-
-	callchain_param.min_percent = strtod(tok, &endptr);
-	if (tok == endptr)
-		return -1;
+	while ((tok = strtok((char *)arg, ",")) != NULL) {
+		if (!strncmp(tok, "none", strlen(tok))) {
+			callchain_param.mode = CHAIN_NONE;
+			symbol_conf.use_callchain = false;
+			return 0;
+		}
 
-	/* get the print limit */
-	tok2 = strtok(NULL, ",");
-	if (!tok2)
-		goto setup;
+		/* try to get the output mode */
+		if (!strncmp(tok, "graph", strlen(tok)))
+			callchain_param.mode = CHAIN_GRAPH_ABS;
+		else if (!strncmp(tok, "flat", strlen(tok)))
+			callchain_param.mode = CHAIN_FLAT;
+		else if (!strncmp(tok, "fractal", strlen(tok)))
+			callchain_param.mode = CHAIN_GRAPH_REL;
+		/* try to get the call chain order */
+		else if (!strncmp(tok, "caller", strlen(tok)))
+			callchain_param.order = ORDER_CALLER;
+		else if (!strncmp(tok, "callee", strlen(tok)))
+			callchain_param.order = ORDER_CALLEE;
+		/* try to get the sort key */
+		else if (!strncmp(tok, "function", strlen(tok)))
+			callchain_param.key = CCKEY_FUNCTION;
+		else if (!strncmp(tok, "address", strlen(tok)))
+			callchain_param.key = CCKEY_ADDRESS;
+		/* try to get the min percent */
+		else if (!minpcnt_set) {
+			callchain_param.min_percent = strtod(tok, &endptr);
+			if (tok == endptr)
+				return -1;
+			minpcnt_set = true;
+		} else {
+			/* try print limit at last */
+			callchain_param.print_limit = strtoul(tok, &endptr, 0);
+			if (tok == endptr)
+				return -1;
+		}
 
-	if (tok2[0] != 'c') {
-		callchain_param.print_limit = strtoul(tok2, &endptr, 0);
-		tok2 = strtok(NULL, ",");
-		if (!tok2)
-			goto setup;
+		arg = NULL;
 	}
 
-	/* get the call chain order */
-	if (!strncmp(tok2, "caller", strlen("caller")))
-		callchain_param.order = ORDER_CALLER;
-	else if (!strncmp(tok2, "callee", strlen("callee")))
-		callchain_param.order = ORDER_CALLEE;
-	else
-		return -1;
-
-	/* Get the sort key */
-	tok2 = strtok(NULL, ",");
-	if (!tok2)
-		goto setup;
-	if (!strncmp(tok2, "function", strlen("function")))
-		callchain_param.key = CCKEY_FUNCTION;
-	else if (!strncmp(tok2, "address", strlen("address")))
-		callchain_param.key = CCKEY_ADDRESS;
-	else
-		return -1;
-setup:
 	if (callchain_register_param(&callchain_param) < 0) {
 		pr_err("Can't register callchain params\n");
 		return -1;
-- 
2.0.0