Initial revision0_29alpha2

1 files changed, 305 insertions, 0 deletions

diff --git a/date.c b/date.c
new file mode 100644
index 000000000..a52a9a4a8
--- /dev/null
+++ b/date.c
@@ -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",
+                    &ltm_time.tm_mon, 
+                    &ltm_time.tm_mday, 
+                    &ltm_time.tm_hour,
+                    &ltm_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);
+
+}