已经跟进到libc.so中了。

应该是判断字符类型吧，下面是android源码中的代码：

onst char _C_ctype_[1 + CTYPE_NUM_CHARS] = {

0,

_C, _C, _C, _C, _C, _C, _C, _C,

_C, _C|_S, _C|_S, _C|_S, _C|_S, _C|_S, _C, _C,

_C, _C, _C, _C, _C, _C, _C, _C,

_C, _C, _C, _C, _C, _C, _C, _C,

   _S|(char)_B, _P, _P, _P, _P, _P, _P, _P,

_P, _P, _P, _P, _P, _P, _P, _P,

_N, _N, _N, _N, _N, _N, _N, _N,

_N, _N, _P, _P, _P, _P, _P, _P,

_P, _U|_X, _U|_X, _U|_X, _U|_X, _U|_X, _U|_X, _U,

_U, _U, _U, _U, _U, _U, _U, _U,

_U, _U, _U, _U, _U, _U, _U, _U,

_U, _U, _U, _P, _P, _P, _P, _P,

_P, _L|_X, _L|_X, _L|_X, _L|_X, _L|_X, _L|_X, _L,

_L, _L, _L, _L, _L, _L, _L, _L,

_L, _L, _L, _L, _L, _L, _L, _L,

/* determine printability based on the IS0 8859 8-bit standard */

_L, _L, _L, _P, _P, _P, _P, _C,

_C, _C, _C, _C, _C, _C, _C, _C, /* 80 */

_C, _C, _C, _C, _C, _C, _C, _C, /* 88 */

_C, _C, _C, _C, _C, _C, _C, _C, /* 90 */

_C, _C, _C, _C, _C, _C, _C, _C, /* 98 */

_P, _P, _P, _P, _P, _P, _P, _P, /* A0 */

_P, _P, _P, _P, _P, _P, _P, _P, /* A8 */

_P, _P, _P, _P, _P, _P, _P, _P, /* B0 */

_P, _P, _P, _P, _P, _P, _P, _P, /* B8 */

_P, _P, _P, _P, _P, _P, _P, _P, /* C0 */

_P, _P, _P, _P, _P, _P, _P, _P, /* C8 */

_P, _P, _P, _P, _P, _P, _P, _P, /* D0 */

_P, _P, _P, _P, _P, _P, _P, _P, /* D8 */

_P, _P, _P, _P, _P, _P, _P, _P, /* E0 */

_P, _P, _P, _P, _P, _P, _P, _P, /* E8 */

_P, _P, _P, _P, _P, _P, _P, _P, /* F0 */

_P, _P, _P, _P, _P, _P, _P, _P  /* F8 */

};

const char *_ctype_ = _C_ctype_;

// TODO: fix the header file so we don't have to duplicate all this inlined stuff.

#if 1 /* ndef NDEBUG */

int isalnum(int c)

{

return (c == -1 ? 0 : ((_ctype_ + 1)[(unsigned char)c] & (_U|_L|_N)));

}

int isalpha(int c)

{

return (c == -1 ? 0 : ((_ctype_ + 1)[(unsigned char)c] & (_U|_L)));

}

int iscntrl(int c)

{

return (c == -1 ? 0 : ((_ctype_ + 1)[(unsigned char)c] & _C));

}

int isdigit(int c)

{

return (c == -1 ? 0 : ((_ctype_ + 1)[(unsigned char)c] & _N));

}

int isgraph(int c)

{

return (c == -1 ? 0 : ((_ctype_ + 1)[(unsigned char)c] & (_P|_U|_L|_N)));

}

int islower(int c)

{

return (c == -1 ? 0 : ((_ctype_ + 1)[(unsigned char)c] & _L));

}

int isprint(int c)

{

return (c == -1 ? 0 : ((_ctype_ + 1)[(unsigned char)c] & (_P|_U|_L|_N|_B)));

}

int ispunct(int c)

{

return (c == -1 ? 0 : ((_ctype_ + 1)[(unsigned char)c] & _P));

}

int isspace(int c)

{

return (c == -1 ? 0 : ((_ctype_ + 1)[(unsigned char)c] & _S));

}

int isupper(int c)

{

return (c == -1 ? 0 : ((_ctype_ + 1)[(unsigned char)c] & _U));

}

int isxdigit(int c)

{

return (c == -1 ? 0 : ((_ctype_ + 1)[(unsigned char)c] & (_N|_X)));

}

oooAooo 已经跟进到libc.so中了。应该是判断字符类型吧，下面是android源码中的代码：onst char _C_ctype_[1 + CTYPE_NUM_CHARS] = { 0, _C, _C, _ ...