1 bool is_ipv4_str(const char* ipv4) 2 { 3 if (!ipv4 || !ipv4[0]) { 4 return false; 5 } 6 7 size_t len = strlen(ipv4); 8 if (len < MIN_IPV4_LEN || len > MAX_IPV4_LEN) { 9 return false; 10 } 11 12 int num[4] = {0}; 13 char c = 0; 14 15 if (sscanf(ipv4, "%d.%d.%d.%d%c", num, num+1, num+2, num+3, &c) != 4) { 16 return false; 17 } 18 19 int i = 0; 20 for (; i < 4; i++) { 21 if (num[i] < 0 || num[i] > 255) { 22 return false; 23 } 24 } 25 26 return true; 27 }
c/c++判断ipv4地址
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