treewide: ISO C / pedantic compliance

 - Shuffle typedefs to avoid need for non-compliant forward declarations
 - Fix non-compliant empty struct initializers
 - Remove use of braced expressions
 - Remove use of anonymous unions
 - Avoid `void *` pointer arithmetic
 - Fix several warnings reported by gcc -pedantic mode and clang 11 compilation

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/util.h b/util.h
index a62ccc4..c4ea087 100644
--- a/util.h
+++ b/util.h
@@ -218,6 +218,7 @@ static inline struct json_tokener *xjs_new_tokener(void) {
 	return tok;
 }
 
+__attribute__((format(printf, 2, 0)))
 static inline int xasprintf(char **strp, const char *fmt, ...) {
 	va_list ap;
 	int len;
@@ -234,6 +235,7 @@ static inline int xasprintf(char **strp, const char *fmt, ...) {
 	return len;
 }
 
+__attribute__((format(printf, 2, 0)))
 static inline int xvasprintf(char **strp, const char *fmt, va_list ap) {
 	int len = vasprintf(strp, fmt, ap);