chibi.crypto: move sexp_uintN_t typedefs to <sexp.h>

First we check for C99 support in Makefile.detect, looking for the
header we need and verifying whether it is the right one by using
a definition required by C99 standard to be present in that header.

uintN_t types are optional, but implementations are required to
provide corresponding limit #defines for the types they support,
so we can check for this with preprocessor only.

Finally, we define SEXP_UINTN_DEFINED for any sexp_uintN_t we have
so that the code can use #ifs to check for exact integer support.

Makefile.detect

@@ -108,7 +108,7 @@ RLDFLAGS=-Wl,-R$(DESTDIR)$(LIBDIR)
 endif
 
 ########################################################################
-# Check for NTP (who needs autoconf?)
+# Check for headers (who needs autoconf?)
 
 ifndef $(SEXP_USE_NTP_GETTIME)
 SEXP_USE_NTP_GETTIME := $(shell echo "main(){struct ntptimeval n; ntp_gettime(&n);}" | gcc -fsyntax-only -include sys/timex.h -xc - >/dev/null 2>/dev/null && echo 1 || echo 0)
@@ -117,3 +117,11 @@ endif
 ifeq ($(SEXP_USE_NTP_GETTIME),1)
 CPPFLAGS += -DSEXP_USE_NTPGETTIME
 endif
+
+ifndef $(SEXP_USE_INTTYPES)
+SEXP_USE_INTTYPES := $(shell echo "main(){int_least8_t x;}" | gcc -fsyntax-only -include inttypes.h -xc - >/dev/null 2>/dev/null && echo 1 || echo 0)
+endif
+
+ifeq ($(SEXP_USE_INTTYPES),1)
+CPPFLAGS += -DSEXP_USE_INTTYPES
+endif

include/chibi/sexp.h

@@ -195,6 +195,34 @@ typedef int sexp_sint_t;
 #define sexp_heap_align(n) sexp_align(n, 4)
 #endif
 
+#ifdef SEXP_USE_INTTYPES
+# include <inttypes.h>
+# ifdef UINT8_MAX
+#  define SEXP_UINT8_DEFINED 1
+typedef uint8_t  sexp_uint8_t;
+# endif
+# ifdef UINT32_MAX
+#  define SEXP_UINT32_DEFINED 1
+typedef uint32_t sexp_uint32_t;
+# endif
+#else
+# include <limits.h>
+# if UCHAR_MAX == 255
+#  define SEXP_UINT8_DEFINED 1
+typedef unsigned char sexp_uint8_t;
+# endif
+# if UINT_MAX == 4294967295U
+#  define SEXP_UINT32_DEFINED 1
+typedef unsigned int sexp_uint32_t;
+# elif ULONG_MAX == 4294967295UL
+#  define SEXP_UINT32_DEFINED 1
+typedef unsigned long sexp_uint32_t;
+# elif USHRT_MAX == 4294967295U
+#  define SEXP_UINT32_DEFINED 1
+typedef unsigned short sexp_uint32_t;
+# endif
+#endif
+
 #if SEXP_USE_LONG_PROCEDURE_ARGS
 typedef int sexp_proc_num_args_t;
 #else

lib/chibi/crypto/integers.h

@@ -1,28 +0,0 @@
-#ifndef CHIBI_CRYPTO_INTEGERS_H
-#define CHIBI_CRYPTO_INTEGERS_H
-
-#if __STDC_VERSION__ >= 199901L /* C99 */
-# include <inttypes.h>
-  typedef uint32_t sexp_uint32_t;
-  typedef uint8_t  sexp_uint8_t;
-#else
-# include <limits.h>
-#
-# if UCHAR_MAX == 255
-    typedef unsigned char sexp_uint8_t;
-# else
-#   error Could not find 8-bit type
-# endif
-#
-# if UINT_MAX == 4294967295U
-    typedef unsigned int sexp_uint32_t;
-# elif ULONG_MAX == 4294967295UL
-    typedef unsigned long sexp_uint32_t;
-# elif USHRT_MAX == 4294967295U
-    typedef unsigned short sexp_uint32_t;
-# else
-#   error Could not find 32-bit type
-# endif
-#endif
-
-#endif /* CHIBI_CRYPTO_INTEGERS_H */

lib/chibi/crypto/sha2.c

@@ -2,7 +2,9 @@
 /* Copyright (c) 2015 Alexei Lozovsky.  All rights reserved. */
 /* BSD-style license: http://synthcode.com/license.txt       */
 
-#include "integers.h"
+#if !(SEXP_UINT8_DEFINED && SEXP_UINT32_DEFINED)
+# error SHA-2 requires exact 8-bit and 32-bit integers to be available
+#endif
 
 /*
  * SHA-2 algorithms are described in RFC 6234: