so, I thought about it and modified `date' accordingly bigger brother
linux. it grew from 7168 to 7488 bytes. not that horrible, I guess.
here it is.
/*
* date small utility to check and set system time.
*
* Usage: /bin/date
* date [?[?]] | <date>
*
* 1999-11-07 [EMAIL PROTECTED]
*
* Copyright 1999 Mario Frasca
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <stdio.h>
#include <time.h>
#include <sys/time.h>
/* our own happy mktime() replacement, with the following drawbacks: */
/* doesn't check boundary conditions */
/* doesn't set wday or yday */
/* doesn't return the local time */
time_t utc_mktime(t)
struct tm *t;
{
static int moffset[12] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304,
304 };
time_t ret;
/* calculate days from years */
ret = t->tm_year - 1970;
ret *= 365L;
/* count leap days in preceding years */
ret += ((t->tm_year -1969) >> 2);
/* calculate days from months */
ret += moffset[t->tm_mon];
/* add in this year's leap day, if any */
if (((t->tm_year & 3) == 0) && (t->tm_mon > 1)) {
ret ++;
}
/* add in days in this month */
ret += (t->tm_mday - 1);
/* convert to hours */
ret *= 24L;
ret += t->tm_hour;
/* convert to minutes */
ret *= 60L;
ret += t->tm_min;
/* convert to seconds */
ret *= 60L;
ret += t->tm_sec;
/* return the result */
return ret;
}
void usage()
{
fputs("date : read or modify current system date\n", stdout);
fputs("usage: date [option] [[yy]yy-m-dTh:m:s]\n", stdout);
fputs(" -s STRING set time described by STRING\n", stdout);
fputs(" -i interactively set time\n", stdout);
fputs(" -c STRING interactively set time if `now' is before STRING\n",
stdout);
exit(1);
}
int decodedatestring(datestring, tv)
char * datestring;
struct timeval *tv;
{
time_t systime;
char * p;
struct tm tm;
p = strtok(datestring, '-');
tm.tm_year= tm.tm_mon= tm.tm_mday= tm.tm_hour= tm.tm_min= tm.tm_sec=0;
do{
tm.tm_year = atoi(p);
if(!(p = strtok(NULL, "-"))) return -1;
tm.tm_mon = atoi(p);tm.tm_mon--;
if(!(p = strtok(NULL, "T"))) return -1;
tm.tm_mday = atoi(p);
p = strtok(NULL, ":");
if(!p) break;
tm.tm_hour = atoi(p);
p = strtok(NULL, ":");
if(!p) break;
tm.tm_min = atoi(p);
p = strtok(NULL, "\n");
if(!p) break;
tm.tm_sec = atoi(p);
}while(0); /* only to have that 'break' */
if(tm.tm_year<70) tm.tm_year+=2000;
else if(tm.tm_year<100)tm.tm_year+=1900;
else if(tm.tm_year<1970)
usage();
systime = utc_mktime(&tm);
tv->tv_sec = systime;
tv->tv_usec = 0;
return 0;
}
int main(argc, argv)
char ** argv;
int argc;
{
time_t systime;
time(&systime);
if(argc==1)
{
fputs(ctime(&systime), stdout);
}
else
{
char *p, buf[32];
struct timeval tv;
int param = 1;
if(argv[param][0] != '-')
usage();
switch(argv[param][1]){
case 'c':
if(decodedatestring(argv[++param], &tv)) usage();
if(systime > tv.tv_sec)
return 0;
case 'i':
fputs("insert current date: ", stdout);
fgets(buf, 31, stdin);
if(decodedatestring(buf, &tv)) usage();
break;
case 's':
if(decodedatestring(argv[++param], &tv)) usage();
break;
default:
usage();
}
if (settimeofday (&tv, NULL) != 0)
{
fprintf (stderr,
"Unable to set time -- probably you are not root\n");
exit (1);
}
/*
* trailing parameters simply ignored
* if(++param < argc) usage();
*/
}
return 0;
}
