fix (and make more robust) strerror.c

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/strerror.c b/lib/strerror.c
index 3cdecae..3720f57 100644
--- a/lib/strerror.c
+++ b/lib/strerror.c
@@ -3,12 +3,14 @@
 
 EXPORT
 const char *substitute_strerror(int err) {
-    #define CASE(code) case code: return #code
+    #define CASE(code) case code: (void) __COUNTER__; return #code
     switch (err) {
         /* substitute.h */
+        enum { _start = __COUNTER__ };
         CASE(SUBSTITUTE_OK);
         CASE(SUBSTITUTE_ERR_FUNC_TOO_SHORT);
         CASE(SUBSTITUTE_ERR_FUNC_BAD_INSN_AT_START);
+        CASE(SUBSTITUTE_ERR_FUNC_CALLS_AT_START);
         CASE(SUBSTITUTE_ERR_FUNC_JUMPS_TO_START);
         CASE(SUBSTITUTE_ERR_OOM);
         CASE(SUBSTITUTE_ERR_VM);
@@ -18,6 +20,9 @@ const char *substitute_strerror(int err) {
         CASE(SUBSTITUTE_ERR_UNKNOWN_RELOCATION_TYPE);
         CASE(SUBSTITUTE_ERR_NO_SUCH_SELECTOR);
         CASE(SUBSTITUTE_ERR_ADJUSTING_THREADS);
+        _Static_assert(__COUNTER__ - _start ==
+                       _SUBSTITUTE_CURRENT_MAX_ERR_PLUS_ONE + 1,
+                       "not all errors named in strerror.c");
         /* substitute-internal.h */
         CASE(SUBSTITUTE_ERR_TASK_FOR_PID);
         CASE(SUBSTITUTE_ERR_MISC);