malloc1.c

eCos操作系统源码

//=================================================================
//
//        malloc1.c
//
//        Testcase for C library malloc(), calloc() and free()
//
//=================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
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// or inline functions from this file, or you compile this file and link it
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//####ECOSGPLCOPYRIGHTEND####
//=================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     jlarmour
// Contributors:  
// Date:          2000-04-30
// Description:   Contains testcode for C library malloc(), calloc() and
//                free() functions
//
//
//####DESCRIPTIONEND####

// INCLUDES

#include <pkgconf/system.h>
#include <pkgconf/memalloc.h> // config header
#ifdef CYGPKG_ISOINFRA
# include <pkgconf/isoinfra.h>
# include <stdlib.h>
#endif
#include <cyg/infra/testcase.h>
#include <limits.h> // INT_MAX


#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

int
main( int argc, char *argv[] )
{
    int *i;
    char *str, *str2, *str3;
    int j;
    int poolmax;

    CYG_TEST_INIT();

    CYG_TEST_INFO("Starting tests from testcase " __FILE__ " for C library "
                  "malloc(), calloc() and free() functions");

    poolmax = mallinfo().maxfree;
    
    if ( poolmax <= 0 ) {
        CYG_TEST_FAIL_FINISH( "Can't determine allocation size to use" );
    }

    // Test 1
    i = (int *) malloc( sizeof(int) );

    // check if it should fit into pool
    if (sizeof(int) > poolmax)
    {
        // didn't fit into pool, so should be NULL
        CYG_TEST_PASS_FAIL( i == NULL,
                            "1 int malloc with no space left works" );
    }
    else
    {
        // since it should fit into pool, we can fiddle with i
        *i=-12345;
        CYG_TEST_PASS_FAIL( i && (*i==-12345),
                            "1 int malloc with space left works" );
        free(i);
    } // else

    // Test 2
    str=(char *) malloc( 4096 );

    if ( 4096 > poolmax)
    {
        // didn't fit into pool, so should be NULL
        CYG_TEST_PASS_FAIL( str == NULL,"4K string with no space left works" );
    }
    else
    {
        // since it should fit into pool, we can fiddle with it.
        for (j=0; j<1024; j++)
        {
            str[j*4] = 'f';
            str[(j*4)+1] = 'r';
            str[(j*4)+2] = 'e';
            str[(j*4)+3] = 'd';
        } // for

        for (j=0; j<1024; j++)
        {
            if ( ((str[j*4] != 'f') ||
                  (str[(j*4)+1] != 'r') ||
                  (str[(j*4)+2] != 'e') ||
                  (str[(j*4)+3] != 'd')) )
                break;
        } // for

        // did j reach the top?
        CYG_TEST_PASS_FAIL( j==1024, "4K string with space left works" );

        free(str);
    } // else       
        

    // Test 3
    str=(char *) calloc( 2, 1024 );

    if ( 2048 > poolmax)
    {
        // didn't fit into pool, so should be NULL
        CYG_TEST_PASS_FAIL( str == NULL,
                            "calloc 2K string with no space left works" );
    }
    else
    {
        // check its zeroed
        for ( j=0; j<2048; j++ )
        {
            if (str[j] != 0)
                break;
        } // for

        CYG_TEST_PASS_FAIL( j==2048, "calloc 2K string is cleared" );

        // since it should fit into pool, we can fiddle with it.
        for (j=0; j<512; j++)
        {
            str[j*4] = 'j';
            str[(j*4)+1] = 'i';
            str[(j*4)+2] = 'f';
            str[(j*4)+3] = 'l';
        } // for

        for (j=0; j<512; j++)
        {
            if ( ((str[j*4] != 'j') ||
                  (str[(j*4)+1] != 'i') ||
                  (str[(j*4)+2] != 'f') ||
                  (str[(j*4)+3] != 'l')) )
                break;
        } // for

        // did j reach the top?
        CYG_TEST_PASS_FAIL( j==512, 
                            "calloc 2K string - with space left works" );

        free(str);
    } // else       

    // Test 4
#if defined(CYGIMP_MEMALLOC_MALLOC_VARIABLE_SIMPLE) && \
      defined(CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_COALESCE)
    poolmax = mallinfo().maxfree; // recalculate for non-coalescing allocator
#endif
    str=(char *)malloc( poolmax+1 );
    CYG_TEST_PASS_FAIL( str==NULL, "malloc too much data returns NULL" );

    // Test 5
    str=(char *)calloc( 1, poolmax+1 );
    CYG_TEST_PASS_FAIL( str==NULL, "calloc too much data returns NULL" );

    // Test 6
    str=(char *)malloc(0); if (str != NULL) free(str);
    str=(char *)calloc(0, 1); if (str != NULL) free(str);
    str=(char *)calloc(1, 0); if (str != NULL) free(str);
    str=(char *)calloc(0, 0); if (str != NULL) free(str);
    // simply shouldn't barf by this point

    CYG_TEST_PASS_FAIL( 1, "malloc and calloc of 0 bytes doesn't crash" );

    // Test 7
    str = (char *)malloc(10);
    i = (int *)malloc(sizeof(int));
    str2 = (char *)malloc(10);

    str3=(char *)i;

    CYG_TEST_PASS_FAIL( ((str3 <= str-sizeof(int))  || (str3 >= &str[10])) &&
                        ((str3 <= str2-sizeof(int)) || (str3 >= &str2[10])) &&
                        ((str+10 <= str2) || (str2+10 <= str)),
                        "Objects don't overlap" );

    // Test 8

    free(i);
    i=(int *)malloc(sizeof(int)*2);
    str3=(char *)i;

    CYG_TEST_PASS_FAIL( ((str3 <= str-sizeof(int))  || (str3 >= &str[10])) &&
                        ((str3 <= str2-sizeof(int)) || (str3 >= &str2[10])) &&
                        ((&str[10] <= str2) || (&str2[10] <= str)),
                        "Objects don't overlap when middle is freed" );
    
    free(i);
    free(str);
    free(str2);

    // Test 9

#if defined(CYGIMP_MEMALLOC_MALLOC_VARIABLE_SIMPLE) && \
      defined(CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_COALESCE)
    poolmax = mallinfo().maxfree; // recalculate for non-coalescing allocator
#endif
    str = (char *)malloc( poolmax );
    CYG_TEST_PASS_FAIL( str != NULL, "malloc of maximum free block size works");
    free(str);

    CYG_TEST_FINISH("Finished tests from testcase " __FILE__ " for C library "
                    "malloc(), calloc() and free() functions");

    return 0;
} // main()

#endif // ifndef NA_MSG

// EOF malloc1.c