Merge pull request #8788 from jboeuf/fix_jwt_verifier

Fix jwt verifier

2 files changed, 13 insertions, 0 deletions

diff --git a/src/core/lib/support/string.c b/src/core/lib/support/string.c
index f10a30f0fd..f263f82baf 100644
--- a/src/core/lib/support/string.c
+++ b/src/core/lib/support/string.c
@@ -275,3 +275,14 @@ int gpr_stricmp(const char *a, const char *b) {
   } while (ca == cb && ca && cb);
   return ca - cb;
 }
+
+void *gpr_memrchr(const void *s, int c, size_t n) {
+  if (s == NULL) return NULL;
+  char *b = (char *)s;
+  for (size_t i = 0; i < n; i++) {
+    if (b[n - i - 1] == c) {
+      return &b[n - i - 1];
+    }
+  }
+  return NULL;
+}
diff --git a/src/core/lib/support/string.h b/src/core/lib/support/string.h
index e933e2eb46..6d1f7cc632 100644
--- a/src/core/lib/support/string.h
+++ b/src/core/lib/support/string.h
@@ -118,6 +118,8 @@ char *gpr_strvec_flatten(gpr_strvec *strs, size_t *total_length);
     lower(a)==lower(b), >0 if lower(a)>lower(b) */
 int gpr_stricmp(const char *a, const char *b);
 
+void *gpr_memrchr(const void *s, int c, size_t n);
+
 #ifdef __cplusplus
 }
 #endif