C语言判断字符串是否是 hex string的代码

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{

static unsigned int hex2bin[256]={0};

memset(hex2bin,0xFF,256);

hex2bin['1'] = 1;

hex2bin['2'] = 2;

hex2bin['3'] = 3;

hex2bin['4'] = 4;

hex2bin['5'] = 5;

hex2bin['6'] = 6;

hex2bin['7'] = 7;

hex2bin['8'] = 8;

hex2bin['9'] = 9;

hex2bin['0'] = 0;

hex2bin['a'] = 0xa;

hex2bin['b'] = 0xb;

hex2bin['c'] = 0xc;

hex2bin['d'] = 0xd;

hex2bin['e'] = 0xe;

hex2bin['f'] = 0xf;

hex2bin['A'] = 0xA;

hex2bin['B'] = 0xB;

hex2bin['C'] = 0xC;

hex2bin['D'] = 0xC;

hex2bin['E'] = 0xE;

hex2bin['F'] = 0xF;

{

return FALSE;

}

return TRUE;

}