60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2018 K. Lange
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*
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* date - Print the current date and time.
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*
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* TODO: The traditional POSIX version of this tool is supposed
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* to accept a format *and* allow you to set the time.
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* We currently lack system calls for setting the time,
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* but when we add those this should probably be updated.
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*
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* At the very least, improving this to print the "correct"
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* default format would be good.
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*/
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#include <stdio.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/time.h>
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static void show_usage(int argc, char * argv[]) {
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printf(
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"%s - print the time and day\n"
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"\n"
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"usage: %s [-?] +FORMAT\n"
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"\n"
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" Note: This implementation is not currently capable of\n"
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" setting the system time.\n"
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"\n"
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" -? \033[3mshow this help text\033[0m\n"
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"\n", argv[0], argv[0]);
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}
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int main(int argc, char * argv[]) {
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char * format = "%a %b %d %T %Y";
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struct tm * timeinfo;
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struct timeval now;
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char buf[BUFSIZ] = {0};
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int opt;
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while ((opt = getopt(argc,argv,"?")) != -1) {
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switch (opt) {
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case '?':
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show_usage(argc,argv);
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return 1;
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}
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}
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if (optind < argc && *argv[optind] == '+') {
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format = &argv[optind][1];
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}
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gettimeofday(&now, NULL); //time(NULL);
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timeinfo = localtime((time_t *)&now.tv_sec);
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strftime(buf,BUFSIZ,format,timeinfo);
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puts(buf);
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return 0;
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}
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