Initial revision
This commit is contained in:
Eric Andersen
305
date.c
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305
date.c
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#include "internal.h"
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <time.h>
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#include <stdio.h>
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#include <getopt.h>
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/* This 'date' command supports only 2 time setting formats,
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all the GNU strftime stuff (its in libc, lets use it),
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setting time using UTC and displaying int, as well as
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an RFC 822 complient date output for shell scripting
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mail commands */
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const char date_usage[] = "date [-uR] [+FORMAT|+%f] [ [-s|-d] MMDDhhmm[[CC]YY]\n | [[[[CCYY.]MM.DD-]hh:mm[:ss]]]] ]";
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static struct option const long_options[] =
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{
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{"date", required_argument, NULL, 'd'},
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/* {"rfc-822", no_argument, NULL, 'R'},
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{"set", required_argument, NULL, 's'},
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{"uct", no_argument, NULL, 'u'},
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{"utc", no_argument, NULL, 'u'},
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{"universal", no_argument, NULL, 'u'}, */
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{NULL, 0, NULL, 0}
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};
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/* Input parsing code is always bulky - used heavy duty libc stuff as
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much as possible, missed out a lot of bounds checking */
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/* Default input handling to save suprising some people */
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struct tm *
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date_conv_time(struct tm *tm_time, const char *t_string) {
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int nr;
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nr = sscanf(t_string, "%2d%2d%2d%2d%d",
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&(tm_time->tm_mon),
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&(tm_time->tm_mday),
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&(tm_time->tm_hour),
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&(tm_time->tm_min),
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&(tm_time->tm_year));
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if(nr < 4 || nr > 5) {
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fprintf(stderr, "date: invalid date `%s'\n", t_string);
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exit(1);
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}
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/* correct for century - minor Y2K problem here? */
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if(tm_time->tm_year >= 1900)
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tm_time->tm_year -= 1900;
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/* adjust date */
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tm_time->tm_mon -= 1;
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return(tm_time);
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}
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/* The new stuff for LRP */
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struct tm *
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date_conv_ftime(struct tm *tm_time, const char *t_string) {
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struct tm itm_time, jtm_time, ktm_time, \
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ltm_time, mtm_time, ntm_time;
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itm_time = *tm_time;
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jtm_time = *tm_time;
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ktm_time = *tm_time;
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ltm_time = *tm_time;
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mtm_time = *tm_time;
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ntm_time = *tm_time;
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/* Parse input and assign appropriately to tm_time */
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if(sscanf(t_string, "%d:%d:%d",
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&itm_time.tm_hour,
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&itm_time.tm_min,
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&itm_time.tm_sec) == 3 ) {
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*tm_time = itm_time;
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return(tm_time);
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} else if (sscanf(t_string, "%d:%d",
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&jtm_time.tm_hour,
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&jtm_time.tm_min) == 2) {
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*tm_time = jtm_time;
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return(tm_time);
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} else if (sscanf(t_string, "%d.%d-%d:%d:%d",
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&ktm_time.tm_mon,
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&ktm_time.tm_mday,
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&ktm_time.tm_hour,
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&ktm_time.tm_min,
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&ktm_time.tm_sec) == 5) {
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ktm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
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*tm_time = ktm_time;
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return(tm_time);
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} else if (sscanf(t_string, "%d.%d-%d:%d",
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<m_time.tm_mon,
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<m_time.tm_mday,
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<m_time.tm_hour,
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<m_time.tm_min) == 4) {
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ltm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
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*tm_time = ltm_time;
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return(tm_time);
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} else if (sscanf(t_string, "%d.%d.%d-%d:%d:%d",
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&mtm_time.tm_year,
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&mtm_time.tm_mon,
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&mtm_time.tm_mday,
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&mtm_time.tm_hour,
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&mtm_time.tm_min,
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&mtm_time.tm_sec) == 6) {
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mtm_time.tm_year -= 1900; /* Adjust years */
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mtm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
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*tm_time = mtm_time;
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return(tm_time);
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} else if (sscanf(t_string, "%d.%d.%d-%d:%d",
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&ntm_time.tm_year,
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&ntm_time.tm_mon,
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&ntm_time.tm_mday,
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&ntm_time.tm_hour,
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&ntm_time.tm_min) == 5) {
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ntm_time.tm_year -= 1900; /* Adjust years */
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ntm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
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*tm_time = ntm_time;
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return(tm_time);
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}
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fprintf(stderr, "date: invalid date `%s'\n", t_string);
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exit(1);
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}
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void
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date_err(void) {
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fprintf(stderr, "date: only one date argument can be given at a time.\n");
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exit(1);
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}
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int
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date_main(struct FileInfo * i, int argc, char * * argv)
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{
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char *date_str = NULL;
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char *date_fmt = NULL;
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char *t_buff;
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int set_time = 0;
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int rfc822 = 0;
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int utc = 0;
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int use_arg = 0;
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int n_args;
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time_t tm;
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struct tm tm_time;
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char optc;
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/* Interpret command line args */
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while ((optc = getopt_long (argc, argv, "d:Rs:u", long_options, NULL))
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!= EOF) {
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switch (optc) {
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case 0:
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break;
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case 'R':
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rfc822 = 1;
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break;
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case 's':
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set_time = 1;
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if(date_str != NULL) date_err();
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date_str = optarg;
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break;
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case 'u':
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utc = 1;
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if (putenv ("TZ=UTC0") != 0) {
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fprintf(stderr,"date: memory exhausted\n");
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return(1);
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}
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#if LOCALTIME_CACHE
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tzset ();
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#endif break;
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case 'd':
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use_arg = 1;
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if(date_str != NULL) date_err();
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date_str = optarg;
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break;
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default:
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usage(date_usage);
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break;
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}
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}
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n_args = argc - optind;
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while (n_args--){
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switch(argv[optind][0]) {
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case '+':
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/* Date format strings */
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if(date_fmt != NULL) {
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fprintf(stderr, "date: only one date format can be given.\n");
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return(1);
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}
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date_fmt = &argv[optind][1];
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break;
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case '\0':
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break;
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default:
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/* Anything left over must be a date string to set the time */
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set_time = 1;
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if(date_str != NULL) date_err();
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date_str = argv[optind];
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break;
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}
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optind++;
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}
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/* Now we have parsed all the information except the date format
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which depends on whether the clock is being set or read */
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time(&tm);
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memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
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/* Zero out fields - take her back to midnight!*/
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if(date_str != NULL) {
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tm_time.tm_sec = 0;
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tm_time.tm_min = 0;
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tm_time.tm_hour = 0;
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}
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/* Process any date input to UNIX time since 1 Jan 1970 */
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if(date_str != NULL) {
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if(strchr(date_str, ':') != NULL) {
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date_conv_ftime(&tm_time, date_str);
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} else {
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date_conv_time(&tm_time, date_str);
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}
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/* Correct any day of week and day of year etc fields */
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tm = mktime(&tm_time);
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if (tm < 0 ) {
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fprintf(stderr, "date: invalid date `%s'\n", date_str);
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exit(1);
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}
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/* if setting time, set it */
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if(set_time) {
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if( stime(&tm) < 0) {
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fprintf(stderr, "date: can't set date.\n");
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exit(1);
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}
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}
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}
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/* Display output */
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/* Deal with format string */
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if(date_fmt == NULL) {
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date_fmt = (rfc822
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? (utc
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? "%a, %_d %b %Y %H:%M:%S GMT"
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: "%a, %_d %b %Y %H:%M:%S %z")
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: "%a %b %e %H:%M:%S %Z %Y");
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} else if ( *date_fmt == '\0' ) {
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/* Imitate what GNU 'date' does with NO format string! */
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printf ("\n");
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return(0);
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}
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/* Handle special conversions */
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if( strncmp( date_fmt, "%f", 2) == 0 ) {
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date_fmt = "%Y.%m.%d-%H:%M:%S";
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}
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/* Print OUTPUT (after ALL that!) */
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t_buff = malloc(201);
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strftime(t_buff, 200, date_fmt, &tm_time);
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printf("%s\n", t_buff);
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return(0);
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}
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