[PATCH 2/5] t/helper/test-hashmap.c: avoid using `strtok()`

[Taylor Blau <me@xxxxxxxxxxxx>]

Avoid using the non-reentrant `strtok()` to separate the parts of each
incoming command. Instead of replacing it with `strtok_r()`, let's
instead use the more friendly `string_list_split_in_place_multi()`.

Signed-off-by: Taylor Blau <me@xxxxxxxxxxxx>
---
 t/helper/test-hashmap.c | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/t/helper/test-hashmap.c b/t/helper/test-hashmap.c
index 36ff07bd4be..902ceb55113 100644
--- a/t/helper/test-hashmap.c
+++ b/t/helper/test-hashmap.c
@@ -2,6 +2,7 @@
 #include "git-compat-util.h"
 #include "hashmap.h"
 #include "strbuf.h"
+#include "string-list.h"
 
 struct test_entry
 {
@@ -150,6 +151,7 @@ static void perf_hashmap(unsigned int method, unsigned int rounds)
  */
 int cmd__hashmap(int argc, const char **argv)
 {
+	struct string_list parts = STRING_LIST_INIT_NODUP;
 	struct strbuf line = STRBUF_INIT;
 	int icase;
 	struct hashmap map = HASHMAP_INIT(test_entry_cmp, &icase);
@@ -159,21 +161,34 @@ int cmd__hashmap(int argc, const char **argv)
 
 	/* process commands from stdin */
 	while (strbuf_getline(&line, stdin) != EOF) {
-		char *cmd, *p1 = NULL, *p2 = NULL;
+		char *cmd, *p1, *p2;
 		unsigned int hash = 0;
 		struct test_entry *entry;
 
+		/*
+		 * Because we memdup() the arguments out of the
+		 * string_list before inserting them into the hashmap,
+		 * it's OK to set its length back to zero to avoid
+		 * re-allocating the items array once per line.
+		 *
+		 * By doing so, we'll instead overwrite the existing
+		 * entries and avoid re-allocating.
+		 */
+		parts.nr = 0;
 		/* break line into command and up to two parameters */
-		cmd = strtok(line.buf, DELIM);
+		string_list_split_in_place_multi(&parts, line.buf, DELIM, 2);
+
 		/* ignore empty lines */
-		if (!cmd || *cmd == '#')
+		if (!parts.nr)
+			continue;
+		if (!*parts.items[0].string || *parts.items[0].string == '#')
 			continue;
 
-		p1 = strtok(NULL, DELIM);
-		if (p1) {
+		cmd = parts.items[0].string;
+		p1 = parts.nr >= 1 ? parts.items[1].string : NULL;
+		p2 = parts.nr >= 2 ? parts.items[2].string : NULL;
+		if (p1)
 			hash = icase ? strihash(p1) : strhash(p1);
-			p2 = strtok(NULL, DELIM);
-		}
 
 		if (!strcmp("add", cmd) && p1 && p2) {
 
@@ -260,6 +275,7 @@ int cmd__hashmap(int argc, const char **argv)
 		}
 	}
 
+	string_list_clear(&parts, 0);
 	strbuf_release(&line);
 	hashmap_clear_and_free(&map, struct test_entry, ent);
 	return 0;
-- 
2.38.0.16.g393fd4c6db