icuSources/samples/date/date.c

   1 /*
   2 **********************************************************************
   3 *   Copyright (C) 1998-2007, 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, char *format, 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   char *format = NULL;
  68
  69
  70   /* parse the options */
  71   for(optind = 1; optind < argc; ++optind) {
  72     arg = argv[optind];
  73
  74     /* version info */
  75     if(strcmp(arg, "-v") == 0 || strcmp(arg, "--version") == 0) {
  76       printVersion = 1;
  77     }
  78     /* usage info */
  79     else if(strcmp(arg, "-h") == 0 || strcmp(arg, "--help") == 0) {
  80       printUsage = 1;
  81     }
  82     /* display date in gmt */
  83     else if(strcmp(arg, "-u") == 0 || strcmp(arg, "--gmt") == 0) {
  84       tz = GMT_ID;
  85     }
  86     /* display date in gmt */
  87     else if(strcmp(arg, "-f") == 0 || strcmp(arg, "--full") == 0) {
  88       style = UDAT_FULL;
  89     }
  90     /* display date in long format */
  91     else if(strcmp(arg, "-l") == 0 || strcmp(arg, "--long") == 0) {
  92       style = UDAT_LONG;
  93     }
  94     /* display date in medium format */
  95     else if(strcmp(arg, "-m") == 0 || strcmp(arg, "--medium") == 0) {
  96       style = UDAT_MEDIUM;
  97     }
  98     /* display date in short format */
  99     else if(strcmp(arg, "-s") == 0 || strcmp(arg, "--short") == 0) {
 100       style = UDAT_SHORT;
 101     }
 102     else if(strcmp(arg, "-F") == 0 || strcmp(arg, "--format") == 0) {
 103       if ( optind + 1 < argc ) {
 104          optind++;
 105          format = argv[optind];
 106       }
 107     }
 108     /* POSIX.1 says all arguments after -- are not options */
 109     else if(strcmp(arg, "--") == 0) {
 110       /* skip the -- */
 111       ++optind;
 112       break;
 113     }
 114     /* unrecognized option */
 115     else if(strncmp(arg, "-", strlen("-")) == 0) {
 116       printf("icudate: invalid option -- %s\n", arg+1);
 117       printUsage = 1;
 118     }
 119     /* done with options, display date */
 120     else {
 121       break;
 122     }
 123   }
 124
 125   /* print usage info */
 126   if(printUsage) {
 127     usage();
 128     return 0;
 129   }
 130
 131   /* print version info */
 132   if(printVersion) {
 133     version();
 134     return 0;
 135   }
 136
 137   /* print the date */
 138   date(tz, style, format, &status);
 139
 140   u_cleanup();
 141   return (U_FAILURE(status) ? 1 : 0);
 142 }
 143
 144 /* Usage information */
 145 static void
 146 usage()
 147 {
 148   puts("Usage: icudate [OPTIONS]");
 149   puts("Options:");
 150   puts("  -h, --help        Print this message and exit.");
 151   puts("  -v, --version     Print the version number of date and exit.");
 152   puts("  -u, --gmt         Display the date in Greenwich Mean Time.");
 153   puts("  -f, --full        Use full display format.");
 154   puts("  -l, --long        Use long display format.");
 155   puts("  -m, --medium      Use medium display format.");
 156   puts("  -s, --short       Use short display format.");
 157 }
 158
 159 /* Version information */
 160 static void
 161 version()
 162 {
 163   printf("icudate version %s (ICU version %s), created by Stephen F. Booth.\n",
 164          DATE_VERSION, U_ICU_VERSION);
 165   puts(U_COPYRIGHT_STRING);
 166 }
 167
 168 /* Format the date */
 169 static void
 170 date(const UChar *tz,
 171      UDateFormatStyle style,
 172      char *format,
 173      UErrorCode *status)
 174 {
 175   UChar *s = 0;
 176   int32_t len = 0;
 177   UDateFormat *fmt;
 178   UChar uFormat[100];
 179
 180   fmt = udat_open(style, style, 0, tz, -1,NULL,0, status);
 181   if ( format != NULL ) {
 182      u_charsToUChars(format,uFormat,strlen(format)),
 183      udat_applyPattern(fmt,FALSE,uFormat,strlen(format));
 184   }
 185   len = udat_format(fmt, ucal_getNow(), 0, len, 0, status);
 186   if(*status == U_BUFFER_OVERFLOW_ERROR) {
 187     *status = U_ZERO_ERROR;
 188     s = (UChar*) malloc(sizeof(UChar) * (len+1));
 189     if(s == 0) goto finish;
 190     udat_format(fmt, ucal_getNow(), s, len + 1, 0, status);
 191     if(U_FAILURE(*status)) goto finish;
 192   }
 193
 194   /* print the date string */
 195   uprint(s, stdout, status);
 196
 197   /* print a trailing newline */
 198   printf("\n");
 199
 200  finish:
 201   udat_close(fmt);
 202   free(s);
 203 }
 204 #endif