On 1/23/19 3:26 AM, Liu Hao wrote:
在 2019/1/23 9:27, Zebediah Figura 写道:
This provides memcmp() for x86 kernel-mode drivers, which for some reason is
not exported from ntoskrnl like other CRT functions.
The implementation was copied and modified from wmemcmp.c in libmingwex.
v3: fix types, restrict to i386
---
+
+int __cdecl memcmp(const void *_S1, const void *_S2, size_t _N)
+{
+ const char *s1 = _S1, *s2 = _S2;
+
I have requested you use `unsigned char *` here or you will get
erroneous results because `char` is signed by default on Windows.
Sorry, will fix that (again...)
+ if (_N == 0 || s1 == s2)
+ return 0; /* even for NULL pointers */
+
+ if ((s1 != NULL) != (s2 != NULL))
+ return s2 == NULL ? 1 : -1; /* robust */
+
+ for ( ; 0 < _N; ++s1, ++s2, --_N)
+ if (*s1 != *s2)
+ return (*s1 < *s2 ? -1 : +1);
+
+ return 0;
+}
+
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