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