109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#define TIMESTRSIZE 1024
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#define FMTSTRSIZE 1024
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/**
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* @brief mydate
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* @details
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* Usage:
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* mydate [-H 12|24] [-y 2|4] [-m] [-d] [-M] [-S]
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* Options:
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* -y: year 2位,4位
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* -m: month
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* -d: day
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* -H: hour 12小时制,24小时制
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* -M: minute
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* -S: second
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*
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* @param argc
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* @param argv
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*
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* @return int
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*/
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int main(int argc, char **argv)
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{
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time_t stamp;
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struct tm *tm;
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char timestr[TIMESTRSIZE];
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int c;
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char fmtstr[FMTSTRSIZE];
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fmtstr[0] = '\0';
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FILE *fp = stdout;
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time(&stamp);
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tm = localtime(&stamp);
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while (1)
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{
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//* 选项传参
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// c = getopt(argc, argv, "H:y:MSmd");
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//* 加'-'，接收非选项传参
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c = getopt(argc, argv, "-H:y:MSmd");
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if (c < 0)
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break;
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switch (c)
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{
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//* 非选项传参，返回1
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case 1:
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if (stdout == fp) //! 先入为主
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{
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fp = fopen(argv[optind - 1], "w");
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if (NULL == fp)
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{
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perror("fopen()");
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fp = stdout;
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}
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}
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break;
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case 'H':
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if (0 == strcmp(optarg, "12"))
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strncat(fmtstr, "%I(%P) ", FMTSTRSIZE - 1);
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else if (0 == strcmp(optarg, "24"))
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strncat(fmtstr, "%H ", FMTSTRSIZE - 1);
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else
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fprintf(stderr,
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"Usage: %s [-H 12|24] [-y 2|4] [-m] [-d] [-M] [-S]\n",
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argv[0]);
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break;
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case 'M': strncat(fmtstr, "%M ", FMTSTRSIZE - 1); break;
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case 'S': strncat(fmtstr, "%S ", FMTSTRSIZE - 1); break;
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case 'y':
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if (0 == strcmp(optarg, "2"))
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strncat(fmtstr, "%y ", FMTSTRSIZE - 1);
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else if (0 == strcmp(optarg, "4"))
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strncat(fmtstr, "%Y ", FMTSTRSIZE - 1);
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else
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fprintf(stderr,
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"Usage: %s [-H 12|24] [-y 2|4] [-m] [-d] [-M] [-S]\n",
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argv[0]);
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break;
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case 'm': strncat(fmtstr, "%m ", FMTSTRSIZE - 1); break;
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case 'd': strncat(fmtstr, "%d ", FMTSTRSIZE - 1); break;
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default: break;
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}
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}
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strncat(fmtstr, "\n", FMTSTRSIZE - 1);
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strftime(timestr, TIMESTRSIZE, fmtstr, tm);
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fputs(timestr, fp);
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if (fp != stdout)
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fclose(fp);
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exit(0);
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} |