Test assumptions we make about the platform

Things that are not guaranteed by the standard but should be true of all
platforms of interest to us:
- 8-bit chars
- NULL pointers represented by all-bits-zero
parent f78e4de6
......@@ -30,6 +30,15 @@
#ifndef MBEDTLS_CHECK_CONFIG_H
#define MBEDTLS_CHECK_CONFIG_H
/*
* We assume CHAR_BIT is 8 in many places. In practice, this is true on our
* target platforms, so not an issue, but let's just be extra sure.
*/
#include <limits.h>
#if CHAR_BIT != 8
#error "mbed TLS requires a platform with 8-bit chars"
#endif
#if defined(MBEDTLS_DEPRECATED_WARNING) && \
!defined(__GNUC__) && !defined(__clang__)
#error "MBEDTLS_DEPRECATED_WARNING only works with GCC and Clang"
......
......@@ -72,6 +72,19 @@ int main( int argc, char *argv[] )
#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
unsigned char buf[1000000];
#endif
void *pointer;
/*
* The C standard doesn't guarantee that all-bits-0 is the representation
* of a NULL pointer. We do however use that in our code for initializing
* structures, which should work on every modern platform. Let's be sure.
*/
memset( &pointer, 0, sizeof( void * ) );
if( pointer != NULL )
{
mbedtls_printf( "all-bits-zero is not a NULL pointer\n" );
return( 1 );
}
if( argc == 2 && strcmp( argv[1], "-quiet" ) == 0 )
v = 0;
......
......@@ -216,6 +216,7 @@ int main()
FILE *file;
char buf[5000];
char *params[50];
void *pointer;
#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C) && \
!defined(TEST_SUITE_MEMORY_BUFFER_ALLOC)
......@@ -223,6 +224,18 @@ int main()
mbedtls_memory_buffer_alloc_init( alloc_buf, sizeof(alloc_buf) );
#endif
/*
* The C standard doesn't guarantee that all-bits-0 is the representation
* of a NULL pointer. We do however use that in our code for initializing
* structures, which should work on every modern platform. Let's be sure.
*/
memset( &pointer, 0, sizeof( void * ) );
if( pointer != NULL )
{
mbedtls_fprintf( stderr, "all-bits-zero is not a NULL pointer\n" );
return( 1 );
}
file = fopen( filename, "r" );
if( file == NULL )
{
......
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