判断IP、MAC地址是否符合规范
2016-01-14 08:57
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#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <ctype.h> int is_valid_ip(const char *ip) { if (ip == NULL || strlen(ip) < 7) { return -1; } int len = strlen(ip); const char *start = ip; const char *end = ip + len - 1; int ret = 0; int dot_count = 0; int cur_val = 0; int val = -1; while (end > start && isspace(*end)) { --end; } while (start < end && isspace(*start)) { ++start; } if (start >= end || isdigit(*start) == 0 || isdigit(*end) == 0) { return -1; } while (start <= end) { while (start <= end && '0' <= *start && *start <= '9') { cur_val = 10 * cur_val + (*start - '0'); if (cur_val < 0 || cur_val > 255) { ret = -1; break; } val = cur_val; ++start; } if (start <= end) { if (*start == '.' && val != -1) { ++start; ++dot_count; cur_val = 0; val = -1; } else { ret = -1; break; } } else { break; } } if (ret == 0 && dot_count != 3) { ret = -1; } return ret; } int is_valid_mac(const char *mac) { if (mac == NULL || strlen(mac) < 17) { return -1; } int len = strlen(mac); int ret = 0; int num_count = 0; int colon_count = 0; const char *start = mac; const char *end = mac + len - 1; while (end > start && isspace(*end)) { --end; } while (start < end && isspace(*start)) { ++start; } if ((end - start) != 16 || isxdigit(*start) == 0 || isxdigit(*end) == 0) { return -1; } while (start <= end) { while (start <= end && isxdigit(*start)) { ++start; if (++num_count > 2) { ret = -1; break; } } if (start <= end ) { if (*start == ':' && num_count == 2) { ++colon_count; num_count = 0; ++start; } else { ret = -1; break; } } else { break; } } if (ret == 0 && colon_count != 5) { ret = -1; } return ret; } void demo() { int ret; const char *ip = "192.168.1.1"; ret = is_valid_ip(ip); if (ret == 0) { printf("%s is a valid ip!\n", ip); } else { printf("%s is an invalid ip!\n", ip); } ip = "192.256.1.1 "; ret = is_valid_ip(ip); if (ret == 0) { printf("%s is a valid ip!\n", ip); } else { printf("%s is an invalid ip!\n", ip); } const char *mac = "11:22:33:44:55:66"; ret = is_valid_mac(mac); if (ret == 0) { printf("%s is a valid MAC address!\n", mac); } else { printf("%s is an invalid MAC address!\n", mac); } mac = "11:22:33:44: :66"; ret = is_valid_mac(mac); if (ret == 0) { printf("%s is a valid MAC address!\n", mac); } else { printf("%s is an invalid MAC address!\n", mac); } } int main() { demo(); return 0; }
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