c: specify static array size in function params

The C standard states:

  A declaration of a parameter as ``array of type'' shall be adjusted to ``qualified pointer to
  type'', where the type qualifiers (if any) are those specified within the [ and ] of the
  array type derivation. If the keyword static also appears within the [ and ] of the
  array type derivation, then for each call to the function, the value of the corresponding
  actual argument shall provide access to the first element of an array with at least as many
  elements as specified by the size expression.

By changing void func(int array[4]) to void func(int array[static 4]),
we automatically get the compiler checking argument sizes for us, which
is quite nice.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/crypto/chacha20poly1305.h b/src/crypto/chacha20poly1305.h
index d1986f7..71bd6bf 100644
--- a/src/crypto/chacha20poly1305.h
+++ b/src/crypto/chacha20poly1305.h
@@ -14,19 +14,19 @@ void chacha20poly1305_init(void);
 
 bool chacha20poly1305_encrypt(uint8_t *dst, const uint8_t *src, const size_t src_len,
 			      const uint8_t *ad, const size_t ad_len,
-			      const uint64_t nonce, const uint8_t key[CHACHA20POLY1305_KEYLEN]);
+			      const uint64_t nonce, const uint8_t key[static CHACHA20POLY1305_KEYLEN]);
 
 bool chacha20poly1305_encrypt_sg(struct scatterlist *dst, struct scatterlist *src, const size_t src_len,
 				 const uint8_t *ad, const size_t ad_len,
-				 const uint64_t nonce, const uint8_t key[CHACHA20POLY1305_KEYLEN]);
+				 const uint64_t nonce, const uint8_t key[static CHACHA20POLY1305_KEYLEN]);
 
 bool chacha20poly1305_decrypt(uint8_t *dst, const uint8_t *src, const size_t src_len,
 			      const uint8_t *ad, const size_t ad_len,
-			      const uint64_t nonce, const uint8_t key[CHACHA20POLY1305_KEYLEN]);
+			      const uint64_t nonce, const uint8_t key[static CHACHA20POLY1305_KEYLEN]);
 
 bool chacha20poly1305_decrypt_sg(struct scatterlist *dst, struct scatterlist *src, const size_t src_len,
 				 const uint8_t *ad, const size_t ad_len,
-				 const uint64_t nonce, const uint8_t key[CHACHA20POLY1305_KEYLEN]);
+				 const uint64_t nonce, const uint8_t key[static CHACHA20POLY1305_KEYLEN]);
 
 #ifdef DEBUG
 bool chacha20poly1305_selftest(void);