1 #include "dmesg.h" 2 #include <stdio.h> 3 #include <string.h> 4 5 /** 6 * @brief 识别dmesg程序的第一个选项参数 7 * 8 * @param arg dmesg命令第一个选项参数 9 * @return int 有效时返回对应选项码，无效时返回 -1 10 */ 11 int getoption(char *arg) 12 { 13 if (!strcmp(arg, "-h") || !strcmp(arg, "--help")) 14 return 0; 15 else if (!strcmp(arg, "-c") || !strcmp(arg, "--read-clear")) 16 return 4; 17 else if (!strcmp(arg, "-C") || !strcmp(arg, "--clear")) 18 return 5; 19 else if (!strcmp(arg, "-l") || !strcmp(arg, "--level")) 20 return 8; 21 22 return -1; 23 } 24 25 /** 26 * @brief 识别dmesg程序的第二个选项参数 27 * 28 * @param arg dmesg命令第一个选项参数 29 * @return int 有效时返回设置的日志级别，无效时返回 -1 30 */ 31 int getlevel(char *arg) 32 { 33 if (!strcmp(arg, "EMERG") || !strcmp(arg, "emerg")) 34 return 0; 35 else if (!strcmp(arg, "ALERT") || !strcmp(arg, "alert")) 36 return 1; 37 else if (!strcmp(arg, "CRIT") || !strcmp(arg, "crit")) 38 return 2; 39 else if (!strcmp(arg, "ERR") || !strcmp(arg, "err")) 40 return 3; 41 else if (!strcmp(arg, "WARN") || !strcmp(arg, "warn")) 42 return 4; 43 else if (!strcmp(arg, "NOTICE") || !strcmp(arg, "notice")) 44 return 5; 45 else if (!strcmp(arg, "INFO") || !strcmp(arg, "info")) 46 return 6; 47 else if (!strcmp(arg, "DEBUG") || !strcmp(arg, "debug")) 48 return 7; 49 else 50 { 51 printf("dmesg: unknown level '%s'\n", arg); 52 } 53 return -2; 54 } 55 56 /** 57 * @brief 打印dmesg手册 58 */ 59 void print_help_msg() 60 { 61 const char *help_msg = "Usage:\n" 62 " dmesg [options]\n\n" 63 "Display or control the kernel ring buffer.\n\n" 64 "Options:\n" 65 " -C, --clear clear the kernel ring buffer\n" 66 " -c, --read-clear read and clear all messages\n" 67 " -l, --level <list> restrict output to defined levels\n" 68 " -h, --help display this help\n\n" 69 "Supported log levels (priorities):\n" 70 " emerg - system is unusable\n" 71 " alert - action must be taken immediately\n" 72 " crit - critical conditions\n" 73 " err - error conditions\n" 74 " warn - warning conditions\n" 75 " notice - normal but significant condition\n" 76 " info - informational\n" 77 " debug - debug-level messages\n"; 78 printf("%s\n", help_msg); 79 } 80 81 /** 82 * @brief 打印dmesg错误使用的信息 83 */ 84 void print_bad_usage_msg() 85 { 86 const char *bad_usage_msg = "dmesg: bad usage\nTry 'dmesg --help' for more information."; 87 printf("%s\n", bad_usage_msg); 88 }