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//=================================================================
//
//        realloc.c
//
//        Testcase for C library realloc()
//
//=================================================================
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// -------------------------------------------
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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