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//=================================================================

//

//        realloc.c

//

//        Testcase for C library realloc()

//

//=================================================================

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//=================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     jlarmour

// Contributors:  

// Date:          2000-04-30

// Description:   Contains testcode for C library realloc() function

//

//

//####DESCRIPTIONEND####

// INCLUDES

#include <pkgconf/system.h>             // Overall system configuration

#include <pkgconf/memalloc.h>           // config header

#ifdef CYGPKG_ISOINFRA

# include <pkgconf/isoinfra.h>

# include <stdlib.h>

#endif

#include <cyg/infra/testcase.h>

#if !defined(CYGPKG_ISOINFRA)

# define NA_MSG "Requires isoinfra package"

#elif !CYGINT_ISO_MAIN_STARTUP

# define NA_MSG "Requires main() to be called"

#elif !CYGINT_ISO_MALLOC

# define NA_MSG "Requires malloc"

#elif !CYGINT_ISO_MALLINFO

# define NA_MSG "Requires mallinfo"

#endif

#ifdef NA_MSG

void

cyg_start(void)

{

    CYG_TEST_INIT();

    CYG_TEST_NA( NA_MSG );

    CYG_TEST_FINISH("Done");

}

#else

// FUNCTIONS

static const char alphabet[]="abcdefghijklmnopqrstuvwxyz{-}[]#';:@~!$^&*()"

                             "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";

extern int

cyg_memalloc_maxalloc( void );

static int

compare_with_alphabet( char *buf, int size, int offset )

{

    int i, buf_offset;

    for (i=offset, buf_offset=0;

         buf_offset < size;

         buf_offset++,i++ ) {

        if ( i==sizeof(alphabet)-1 )

            i=0;

        if ( buf[buf_offset] != alphabet[i] ) {

            CYG_TEST_FAIL( "buffer has not retained correct data!");

            return 0; // fail

        } // if

    } // for

    return 1; // success

} // compare_with_alphabet()

static int

fill_with_alphabet( char *buf, int size, int offset )

{

    int i, buf_offset;

    for (i=offset, buf_offset=0;

         buf_offset < size;

         buf_offset++,i++ ) {

        if ( i==sizeof(alphabet)-1 )

            i=0;

        buf[buf_offset] = alphabet[i];

    } // for

    return compare_with_alphabet( buf, size, offset); // be sure

} // fill_with_alphabet()

int

main( int argc, char *argv[] )

{

    char *str;

    int size;

    int poolmax;

    CYG_TEST_INIT();

    CYG_TEST_INFO("Starting tests from testcase " __FILE__ " for C library "

                  "realloc() function");

    poolmax = mallinfo().maxfree;

    if ( poolmax <= 0 ) {

        CYG_TEST_FAIL_FINISH( "Can't determine allocation size to use" );

    }

    size = poolmax/2;

    str = (char *)realloc( NULL, size );

    CYG_TEST_PASS_FAIL( str != NULL, "realloc doing only allocation");

    CYG_TEST_PASS_FAIL( fill_with_alphabet( str, size, 0 ),

                        "allocation usability");

    str = (char *)realloc( str, 0 );

    CYG_TEST_PASS_FAIL( str == NULL, "realloc doing implicit free" );

    str = (char *)realloc( NULL, size/2 );

    CYG_TEST_PASS_FAIL( str != NULL, "realloc doing allocation to half size");

    CYG_TEST_PASS_FAIL( fill_with_alphabet( str, size/2, 5 ),

                        "half allocation usability");

    str = (char *)realloc( str, size );

    CYG_TEST_PASS_FAIL( str != NULL,

                        "reallocing allocation back to normal size");

    CYG_TEST_PASS_FAIL( compare_with_alphabet(str, size/2, 5),

                        "after realloc to normal size, old contents kept" );

    CYG_TEST_PASS_FAIL( fill_with_alphabet( str, size, 3 ),

                        "reallocation normal size usability");

    str = (char *)realloc( str, size/4 );

    CYG_TEST_PASS_FAIL( str != NULL, "reallocing allocation to quarter size");

    CYG_TEST_PASS_FAIL( compare_with_alphabet(str, size/4, 3),

                        "after realloc to quarter size, old contents kept" );

    CYG_TEST_PASS_FAIL( fill_with_alphabet( str, size/4, 1 ),

                        "reallocation quarter size usability");

    CYG_TEST_PASS_FAIL( realloc( str, size*4 ) == NULL,

                        "reallocing allocation that is too large" );

    CYG_TEST_PASS_FAIL( compare_with_alphabet( str, size/4, 1 ),

                        "Checking old contents maintained despite failure" );

    str = (char *)realloc( str, 0 );

    CYG_TEST_PASS_FAIL( str == NULL, "realloc doing implicit free again" );

    CYG_TEST_FINISH("Finished tests from testcase " __FILE__ " for C library "

                    "realloc() function");

    return 0;

} // main()

#endif // ifndef NA_MSG

// EOF realloc.c