util/spkmodem-decode: static asserts

assert integer sizes, important in this program because
we make several implicit assumptions about word sizes,
and integers need to be of a certain size.

Signed-off-by: Leah Rowe <leah@libreboot.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/util/spkmodem_decode/spkmodem-decode.c b/util/spkmodem_decode/spkmodem-decode.c
index a24c22d1..348840ac 100644
--- a/util/spkmodem_decode/spkmodem-decode.c
+++ b/util/spkmodem_decode/spkmodem-decode.c
@@ -63,6 +63,7 @@
 #endif
 
 #include <errno.h>
+#include <limits.h>
 #include <stdio.h>
 #include <stdarg.h>
 #include <stdlib.h>
@@ -257,6 +258,14 @@ extern int optind;
 extern int opterr;
 extern int optopt;
 
+typedef char static_assert_char_is_8_bits[(CHAR_BIT == 8) ? 1 : -1];
+typedef char static_assert_char_is_1[(sizeof(char) == 1) ? 1 : -1];
+typedef char static_assert_short[(sizeof(short) == 2) ? 1 : -1];
+typedef char static_assert_int_is_4[(sizeof(int) >= 4) ? 1 : -1];
+typedef char static_assert_twos_complement[
+    ((-1 & 3) == 3) ? 1 : -1
+];
+
 int
 main(int argc, char **argv)
 {