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Annotation of os232sdk/toolkt20/c/samples/spy/spyutil.c, revision 1.1.1.1

1.1       root        1: /****************************** Module Header ******************************\
                      2: * Module Name:  spyutil.c
                      3: *
                      4: * Created: Microsoft, IBM Corporation 1990
                      5: *
                      6: \***************************************************************************/
                      7: 
                      8: #include <os2.h>
                      9: 
                     10: BOOL FGuessValidPointer (PVOID pvoid, SHORT cbStruct, ULONG ulMemFlags) {
                     11: 
                     12:     ULONG   ulSize = (ULONG)cbStruct;
                     13:     ULONG   ulFlags;
                     14: 
                     15:     if (DosQueryMem(pvoid, &ulSize, &ulFlags) != 0)
                     16:         return (FALSE);     // Not valid memory
                     17: 
                     18:     if (ulSize < (ULONG)cbStruct)
                     19:         return (FALSE);
                     20: 
                     21:     // Make sure right flags are set
                     22:     if ((ulFlags & ulMemFlags) != ulMemFlags)
                     23:         return (FALSE);
                     24: 
                     25:     // Not perfect, but maybe sufficent for now to say it is valid!
                     26:     return (TRUE);
                     27: }
                     28: 
                     29: BOOL   CopyStruct(UCHAR *pbSrc, UCHAR *pbDst, SHORT cb)
                     30: {
                     31: 
                     32:     // For now simply make sure both source and destination pointers
                     33:     // appear to be valid
                     34:     if (!FGuessValidPointer(pbSrc, cb, PAG_READ) ||
                     35:             !FGuessValidPointer(pbDst, cb, PAG_READ | PAG_WRITE))
                     36:         return (FALSE);
                     37: 
                     38:     for (; cb > 0 ; cb--) {
                     39:         *pbDst++ = *pbSrc++;
                     40:     }
                     41: 
                     42:     return (TRUE);
                     43: }

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