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命令行参数分析

作者:互联网

#include <unistd.h>

int getopt(int argc, char * const argv[],const char *optstring);  //获取命令行参数

extern char *optarg;   //参数选项(全局变量)

extern int optind, opterr, optopt; (全局变量)

 

命令行解析示例:optget.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>

#define STRSIZE 1024
#define FMTSIZE 1024

int main(int argc, char **argv)
{
  time_t currentTime;
  struct tm *tmRes;
  int c;
  char strTime[STRSIZE];
  char strOpt[FMTSIZE] = {};
  FILE *fp = stdout;

  currentTime = time(NULL);       //获取当前时间戳
  if(currentTime == ((time_t) -1))
  {
    perror("time()");
    exit(1);
  }

  tmRes = localtime(&currentTime);  //将时间戳转为时间结构体
  if(tmRes ==NULL)
  {
    perror("localtime()");
    exit(1);
  }

  while(1)
  {
    c = getopt(argc,argv,"-y:mdH:MS");   //循环读取argv参数与要解析的对比    “X:"表示命令包含参数       头包含 "- "表示非命令传参
    if(c<0)
    break;

    switch(c)   //命令解析
    {
      case 1:   //头包含 "- "时
        fp = fopen(argv[optind-1],"w");    //解析optind-1
        if(fp == NULL)
        {
          perror("fopen()");
          fp == stdout;
        }
      break;


      case 'y':
        if(strcmp(optarg,"2")==0)
          strncat(strOpt,"%y ",FMTSIZE);
        else if(strcmp(optarg,"4")==0)
          strncat(strOpt,"%Y ",FMTSIZE);
        else
          fprintf(stderr,"invalid arg of y\n");
        break;

      case 'm':
        strncat(strOpt,"%m ",FMTSIZE);
        break;
      case 'd':
        strncat(strOpt,"%d ",FMTSIZE);
        break;
      case 'H':
        if(strcmp(optarg,"12") ==0)
          strncat(strOpt,"%I(%p) ",FMTSIZE);
        else if(strcmp(optarg,"24") ==0)
          strncat(strOpt,"%H ",FMTSIZE);
        else
          fprintf(stderr,"invalid arg of H\n");
        break;
      case 'M':
        strncat(strOpt,"%M ",FMTSIZE);
        break;
      case 'S':
        strncat(strOpt,"%S ",FMTSIZE);
        break;
      default:
        break;
    }
  }

  strncat(strOpt,"\n",FMTSIZE);
  strftime(strTime,STRSIZE,strOpt,tmRes);   //格式化输出时间
  fputs(strTime,fp);

  if(fp !=stdout)
  fclose(fp);    //关闭文件

  exit(0);
}

标签:分析,strncat,break,fp,strOpt,参数,命令行,FMTSIZE,case
来源: https://www.cnblogs.com/linux-learn/p/16461971.html