icuSources/samples/date/date.c

   1 /*
   2 **********************************************************************
   3 *   Copyright (C) 1998-2000, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 **********************************************************************
   6 *
   7 * File date.c
   8 *
   9 * Modification History:
  10 *
  11 *   Date        Name        Description
  12 *   06/11/99    stephen     Creation.
  13 *   06/16/99    stephen     Modified to use uprint.
  14 *******************************************************************************
  15 */
  16
  17 #include <stdlib.h>
  18 #include <stdio.h>
  19 #include <string.h>
  20
  21 #include "unicode/utypes.h"
  22 #include "unicode/ustring.h"
  23 #include "unicode/uclean.h"
  24
  25 #include "unicode/ucnv.h"
  26 #include "unicode/udat.h"
  27 #include "unicode/ucal.h"
  28
  29 #include "uprint.h"
  30
  31 int main(int argc, char **argv);
  32
  33 #if UCONFIG_NO_FORMATTING
  34
  35 int main(int argc, char **argv)
  36 {
  37   printf("%s: Sorry, UCONFIG_NO_FORMATTING was turned on (see uconfig.h). No formatting can be done. \n", argv[0]);
  38   return 0;
  39 }
  40 #else
  41
  42
  43 /* Protos */
  44 static void usage(void);
  45 static void version(void);
  46 static void date(const UChar *tz, UDateFormatStyle style, UErrorCode *status);
  47
  48
  49 /* The version of date */
  50 #define DATE_VERSION "1.0"
  51
  52 /* "GMT" */
  53 static const UChar GMT_ID [] = { 0x0047, 0x004d, 0x0054, 0x0000 };
  54
  55
  56 int
  57 main(int argc,
  58      char **argv)
  59 {
  60   int printUsage = 0;
  61   int printVersion = 0;
  62   int optind = 1;
  63   char *arg;
  64   const UChar *tz = 0;
  65   UDateFormatStyle style = UDAT_DEFAULT;
  66   UErrorCode status = U_ZERO_ERROR;
  67
  68
  69   /* parse the options */
  70   for(optind = 1; optind < argc; ++optind) {
  71     arg = argv[optind];
  72
  73     /* version info */
  74     if(strcmp(arg, "-v") == 0 || strcmp(arg, "--version") == 0) {
  75       printVersion = 1;
  76     }
  77     /* usage info */
  78     else if(strcmp(arg, "-h") == 0 || strcmp(arg, "--help") == 0) {
  79       printUsage = 1;
  80     }
  81     /* display date in gmt */
  82     else if(strcmp(arg, "-u") == 0 || strcmp(arg, "--gmt") == 0) {
  83       tz = GMT_ID;
  84     }
  85     /* display date in gmt */
  86     else if(strcmp(arg, "-f") == 0 || strcmp(arg, "--full") == 0) {
  87       style = UDAT_FULL;
  88     }
  89     /* display date in long format */
  90     else if(strcmp(arg, "-l") == 0 || strcmp(arg, "--long") == 0) {
  91       style = UDAT_LONG;
  92     }
  93     /* display date in medium format */
  94     else if(strcmp(arg, "-m") == 0 || strcmp(arg, "--medium") == 0) {
  95       style = UDAT_MEDIUM;
  96     }
  97     /* display date in short format */
  98     else if(strcmp(arg, "-s") == 0 || strcmp(arg, "--short") == 0) {
  99       style = UDAT_SHORT;
 100     }
 101     /* POSIX.1 says all arguments after -- are not options */
 102     else if(strcmp(arg, "--") == 0) {
 103       /* skip the -- */
 104       ++optind;
 105       break;
 106     }
 107     /* unrecognized option */
 108     else if(strncmp(arg, "-", strlen("-")) == 0) {
 109       printf("icudate: invalid option -- %s\n", arg+1);
 110       printUsage = 1;
 111     }
 112     /* done with options, display date */
 113     else {
 114       break;
 115     }
 116   }
 117
 118   /* print usage info */
 119   if(printUsage) {
 120     usage();
 121     return 0;
 122   }
 123
 124   /* print version info */
 125   if(printVersion) {
 126     version();
 127     return 0;
 128   }
 129
 130   /* print the date */
 131   date(tz, style, &status);
 132
 133   u_cleanup();
 134   return (U_FAILURE(status) ? 1 : 0);
 135 }
 136
 137 /* Usage information */
 138 static void
 139 usage()
 140 {
 141   puts("Usage: icudate [OPTIONS]");
 142   puts("Options:");
 143   puts("  -h, --help        Print this message and exit.");
 144   puts("  -v, --version     Print the version number of date and exit.");
 145   puts("  -u, --gmt         Display the date in Greenwich Mean Time.");
 146   puts("  -f, --full        Use full display format.");
 147   puts("  -l, --long        Use long display format.");
 148   puts("  -m, --medium      Use medium display format.");
 149   puts("  -s, --short       Use short display format.");
 150 }
 151
 152 /* Version information */
 153 static void
 154 version()
 155 {
 156   printf("icudate version %s (ICU version %s), created by Stephen F. Booth.\n",
 157          DATE_VERSION, U_ICU_VERSION);
 158   puts(U_COPYRIGHT_STRING);
 159 }
 160
 161 /* Format the date */
 162 static void
 163 date(const UChar *tz,
 164      UDateFormatStyle style,
 165      UErrorCode *status)
 166 {
 167   UChar *s = 0;
 168   int32_t len = 0;
 169   UDateFormat *fmt;
 170
 171   fmt = udat_open(style, style, 0, tz, -1,NULL,0, status);
 172   len = udat_format(fmt, ucal_getNow(), 0, len, 0, status);
 173   if(*status == U_BUFFER_OVERFLOW_ERROR) {
 174     *status = U_ZERO_ERROR;
 175     s = (UChar*) malloc(sizeof(UChar) * (len+1));
 176     if(s == 0) goto finish;
 177     udat_format(fmt, ucal_getNow(), s, len + 1, 0, status);
 178     if(U_FAILURE(*status)) goto finish;
 179   }
 180
 181   /* print the date string */
 182   uprint(s, stdout, status);
 183
 184   /* print a trailing newline */
 185   printf("\n");
 186
 187  finish:
 188   udat_close(fmt);
 189   free(s);
 190 }
 191 #endif