| 1 | |
| 2 | #include <stddef.h>
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| 3 |
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| 4 | |
| 5 | * Override the "basic" built-in string helpers so that they can be used in
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| 6 | * guest code. KVM selftests don't support dynamic loading in guest code and
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| 7 | * will jump into the weeds if the compiler decides to insert an out-of-line
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| 8 | * call via the PLT.
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| 9 |
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| 10 | int memcmp(const void *cs, const void *ct, size_t count)
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| 11 | {
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| 12 | const unsigned char *su1, *su2;
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| 13 | int res = 0;
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| 14 |
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| 15 | for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--) {
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| 16 | if ((res = *su1 - *su2) != 0)
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| 17 | break;
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| 18 | }
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| 19 | return res;
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| 20 | }
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| 21 |
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| 22 | void *memcpy(void *dest, const void *src, size_t count)
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| 23 | {
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| 24 | char *tmp = dest;
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| 25 | const char *s = src;
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| 26 |
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| 27 | while (count--)
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| 28 | *tmp++ = *s++;
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| 29 | return dest;
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| 30 | }
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| 31 |
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| 32 | void *memset(void *s, int c, size_t count)
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| 33 | {
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| 34 | char *xs = s;
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| 35 |
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| 36 | while (count--)
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| 37 | *xs++ = c;
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| 38 | return s;
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| 39 | }
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| 40 |
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| 41 | size_t strnlen(const char *s, size_t count)
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| 42 | {
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| 43 | const char *sc;
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| 44 |
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| 45 | for (sc = s; count-- && *sc != '\0'; ++sc)
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| 46 | ;
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| 47 | return sc - s;
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| 48 | }
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