[PATCH i-g-t 5/8] lib/igt_drm_fdinfo: Simplify find_kv()

[Lucas De Marchi <lucas.demarchi@intel.com>]

index() is deprecate from libc and strchr() should rather be used.
Moreover the return value is NULL or a pointer to the occurrence, never
the initial string and `(p - buf) != keylen` can only be true if ':' is
the next char after the key.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 lib/igt_drm_fdinfo.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/lib/igt_drm_fdinfo.c b/lib/igt_drm_fdinfo.c
index 17cac4009..15f71e172 100644
--- a/lib/igt_drm_fdinfo.c
+++ b/lib/igt_drm_fdinfo.c
@@ -106,20 +106,17 @@ static int parse_engine(char *line, struct drm_client_fdinfo *info,
 
 static const char *find_kv(const char *buf, const char *key, size_t keylen)
 {
-	const char *p = buf;
+	const char *p;
 
 	if (strncmp(buf, key, keylen))
 		return NULL;
 
-	p = index(buf, ':');
-	if (!p || p == buf)
-		return NULL;
-	if ((p - buf) != keylen)
+	p = buf + keylen;
+	if (*p != ':')
 		return NULL;
 
-	p++;
-	while (*p && isspace(*p))
-		p++;
+	for (p++; *p && isspace(*p); p++)
+		;
 
 	return *p ? p : NULL;
 }
@@ -233,8 +230,7 @@ __igt_parse_drm_fdinfo(int dir, const char *fd, struct drm_client_fdinfo *info,
 		if ((v = find_kv(l, "drm-driver", strlen("drm-driver")))) {
 			strncpy(info->driver, v, sizeof(info->driver) - 1);
 			good++;
-		}  else if ((v = find_kv(l, "drm-client-id",
-					 strlen("drm-client-id")))) {
+		}  else if ((v = find_kv(l, "drm-client-id", strlen("drm-client-id")))) {
 			info->id = atol(v);
 			good++;
 		} else if ((v = find_kv(l, "drm-pdev", strlen("drm-pdev")))) {
-- 
2.43.0