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- #include <string.h>
- #ifdef __USE_GNU
- #undef strnlen
- size_t strnlen(const char *s, size_t count)
- {
- int edx;
- int eax;
- __asm__ __volatile__(
- " leal -1(%%ecx), %%eax\n"
- "1: incl %%eax\n"
- " decl %%edx\n"
- " jz 3f\n"
- " cmpb $0, (%%eax)\n"
- " jnz 1b\n"
- "3: subl %%ecx, %%eax"
- : "=a" (eax), "=&d" (edx)
- : "c" (s), "1" (count + 1)
- );
- return eax;
- }
- #ifndef strnlen
- libc_hidden_def(strnlen)
- #else
- int main()
- {
- printf(strnlen("abc\0def", -2) == 3 ? "ok\n" : "BAD!\n");
- printf(strnlen("abc\0def", -1) == 3 ? "ok\n" : "BAD!\n");
- printf(strnlen("abc\0def", 0) == 0 ? "ok\n" : "BAD!\n");
- printf(strnlen("abc\0def", 1) == 1 ? "ok\n" : "BAD!\n");
- printf(strnlen("abc\0def", 2) == 2 ? "ok\n" : "BAD!\n");
- printf(strnlen("abc\0def", 3) == 3 ? "ok\n" : "BAD!\n");
- printf(strnlen("abc\0def", 4) == 3 ? "ok\n" : "BAD!\n");
- printf(strnlen("abc\0def", 5) == 3 ? "ok\n" : "BAD!\n");
- }
- #endif
- #endif
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