1 2 /* 3 We define the memory operations here. The reason we just do not use 4 the standard memory routines in the PETSc code is that on some machines 5 they are broken. 6 7 */ 8 #include <petscsys.h> /*I "petscsys.h" I*/ 9 #include <petscbt.h> 10 #include <../src/sys/utils/ftn-kernels/fcopy.h> 11 12 #undef __FUNCT__ 13 #define __FUNCT__ "PetscMemcmp" 14 /*@ 15 PetscMemcmp - Compares two byte streams in memory. 16 17 Not Collective 18 19 Input Parameters: 20 + str1 - Pointer to the first byte stream 21 . str2 - Pointer to the second byte stream 22 - len - The length of the byte stream 23 (both str1 and str2 are assumed to be of length len) 24 25 Output Parameters: 26 . e - PETSC_TRUE if equal else PETSC_FALSE. 27 28 Level: intermediate 29 30 Note: 31 This routine is anologous to memcmp() 32 @*/ 33 PetscErrorCode PetscMemcmp(const void *str1,const void *str2,size_t len,PetscBool *e) 34 { 35 int r; 36 37 PetscFunctionBegin; 38 if (len > 0 && !str1) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_NULL,"Trying to compare at a null pointer"); 39 if (len > 0 && !str2) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_NULL,"Trying to compare at a null pointer"); 40 r = memcmp((char*)str1,(char*)str2,len); 41 if (!r) *e = PETSC_TRUE; 42 else *e = PETSC_FALSE; 43 PetscFunctionReturn(0); 44 } 45 46 #undef __FUNCT__ 47 #define __FUNCT__ "PetscMemmove" 48 /*@ 49 PetscMemmove - Copies n bytes, beginning at location b, to the space 50 beginning at location a. Copying between regions that overlap will 51 take place correctly. 52 53 Not Collective 54 55 Input Parameters: 56 + b - pointer to initial memory space 57 - n - length (in bytes) of space to copy 58 59 Output Parameter: 60 . a - pointer to copy space 61 62 Level: intermediate 63 64 Note: 65 This routine is analogous to memmove(). 66 67 Since b can overlap with a, b cannot be declared as const 68 69 Concepts: memory^copying with overlap 70 Concepts: copying^memory with overlap 71 72 .seealso: PetscMemcpy() 73 @*/ 74 PetscErrorCode PetscMemmove(void *a,void *b,size_t n) 75 { 76 PetscFunctionBegin; 77 if (n > 0 && !a) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_NULL,"Trying to copy to null pointer"); 78 if (n > 0 && !b) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_NULL,"Trying to copy from a null pointer"); 79 #if !defined(PETSC_HAVE_MEMMOVE) 80 if (a < b) { 81 if (a <= b - n) memcpy(a,b,n); 82 else { 83 memcpy(a,b,(int)(b - a)); 84 PetscMemmove(b,b + (int)(b - a),n - (int)(b - a)); 85 } 86 } else { 87 if (b <= a - n) memcpy(a,b,n); 88 else { 89 memcpy(b + n,b + (n - (int)(a - b)),(int)(a - b)); 90 PetscMemmove(a,b,n - (int)(a - b)); 91 } 92 } 93 #else 94 memmove((char*)(a),(char*)(b),n); 95 #endif 96 PetscFunctionReturn(0); 97 } 98 99 100 101 102