diff options
Diffstat (limited to 'libc/tests/grab.c')
-rw-r--r-- | libc/tests/grab.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/libc/tests/grab.c b/libc/tests/grab.c new file mode 100644 index 0000000..b65fa28 --- /dev/null +++ b/libc/tests/grab.c @@ -0,0 +1,81 @@ + +#include <stdio.h> +#include <malloc.h> + +struct s +{ + struct s * n; + char v[1]; +}; + +#define M ((unsigned)-1>>1) +#define V (M^(M>>1)) + +main (argc,argv) +int argc; +char ** argv; +{ + struct s * ptr1 = 0; + struct s * ptr2; + struct s * ptr3; + int i,sz; + unsigned long total = 0; + + for(i=0, sz=256 ; i<32; i++, sz = ((sz << 1) | (sz & V)) & M) + { + ptr2 = (struct s *) malloc(sz-sizeof(int)); + printf("%2d(%8u)..%08lx..%ld\n",i,sz,(long)ptr2,(long)ptr2); + if(ptr2==0) break; + total+=sz; + if(ptr1==0) + { + ptr1 = ptr3 = ptr2; + ptr3->n = 0; + } + else + { + ptr3->n = ptr2; + ptr3 = ptr2; + ptr3->n = 0; + } + } + for(sz>>=1; sz>3; ) + { + ptr2 = (struct s *) malloc(sz-sizeof(int)); + if(ptr2==0) { sz >>=1; continue; } + printf("%2d(%8u)..%08lx..%ld\n",i++,sz,(long)ptr2,(long)ptr2); + total+=sz; + if(ptr1==0) + { + ptr1 = ptr3 = ptr2; + ptr3->n = 0; + } + else + { + ptr3->n = ptr2; + ptr3 = ptr2; + ptr3->n = 0; + } + } + printf("Free all - total was %ldK bytes\n", total/1024); + while( ptr1 ) + { + ptr3 = ptr1->n; + free(ptr1); + ptr1 = ptr3; + } + ptr2 = (struct s *) malloc(200); + printf("%2d(%8u)..%08lx..%ld\n",i++,200,(long)ptr2,(long)ptr2); + ptr2 = (struct s *) malloc(30000); + printf("%2d(%8u)..%08lx..%ld\n",i++,30000,(long)ptr2,(long)ptr2); + ptr2 = (struct s *) malloc(20000); + printf("%2d(%8u)..%08lx..%ld\n",i++,20000,(long)ptr2,(long)ptr2); + sz = (256<<sizeof(int)); + do + { + ptr2 = (struct s *) malloc(sz-sizeof(int)); + printf("%2d(%8u)..%08lx..%ld\n",i++,sz,(long)ptr2,(long)ptr2); + } + while(ptr2 && i < 100); + exit(0); +} |