1 #include "dmesg.h" 2 3 /** 4 * @brief 识别dmesg程序的第一个选项参数 5 * 6 * @param arg dmesg命令第一个选项参数 7 * @return int 有效时返回对应选项码，无效时返回 -1 8 */ 9 int getopt(char *arg) 10 { 11 if (!strcmp(arg, "-h") || !strcmp(arg, "--help")) 12 return 0; 13 else if (!strcmp(arg, "-c") || !strcmp(arg, "--read-clear")) 14 return 4; 15 else if (!strcmp(arg, "-C") || !strcmp(arg, "--clear")) 16 return 5; 17 else if (!strcmp(arg, "-l") || !strcmp(arg, "--level")) 18 return 8; 19 20 return -1; 21 } 22 23 /** 24 * @brief 识别dmesg程序的第二个选项参数 25 * 26 * @param arg dmesg命令第一个选项参数 27 * @return int 有效时返回设置的日志级别，无效时返回 -1 28 */ 29 int getlevel(char *arg) 30 { 31 if (!strcmp(arg, "EMERG") || !strcmp(arg, "emerg")) 32 return 0; 33 else if (!strcmp(arg, "ALERT") || !strcmp(arg, "alert")) 34 return 1; 35 else if (!strcmp(arg, "CRIT") || !strcmp(arg, "crit")) 36 return 2; 37 else if (!strcmp(arg, "ERR") || !strcmp(arg, "err")) 38 return 3; 39 else if (!strcmp(arg, "WARN") || !strcmp(arg, "warn")) 40 return 4; 41 else if (!strcmp(arg, "NOTICE") || !strcmp(arg, "notice")) 42 return 5; 43 else if (!strcmp(arg, "INFO") || !strcmp(arg, "info")) 44 return 6; 45 else if (!strcmp(arg, "DEBUG") || !strcmp(arg, "debug")) 46 return 7; 47 else 48 { 49 printf("dmesg: unknown level '%s'\n", arg); 50 } 51 return -2; 52 } 53 54 /** 55 * @brief 打印dmesg手册 56 */ 57 void print_help_msg() 58 { 59 const char *help_msg = "Usage:\n" 60 " dmesg [options]\n\n" 61 "Display or control the kernel ring buffer.\n\n" 62 "Options:\n" 63 " -C, --clear clear the kernel ring buffer\n" 64 " -c, --read-clear read and clear all messages\n" 65 " -l, --level <list> restrict output to defined levels\n" 66 " -h, --help display this help\n\n" 67 "Supported log levels (priorities):\n" 68 " emerg - system is unusable\n" 69 " alert - action must be taken immediately\n" 70 " crit - critical conditions\n" 71 " err - error conditions\n" 72 " warn - warning conditions\n" 73 " notice - normal but significant condition\n" 74 " info - informational\n" 75 " debug - debug-level messages\n"; 76 printf("%s\n", help_msg); 77 } 78 79 /** 80 * @brief 打印dmesg错误使用的信息 81 */ 82 void print_bad_usage_msg() 83 { 84 const char *bad_usage_msg = "dmesg: bad usage\nTry 'dmesg --help' for more information."; 85 printf("%s\n", bad_usage_msg); 86 }