icuSources/samples/ufortune/ufortune.c

   1 /*************************************************************************
   2 *
   3 *   © 2016 and later: Unicode, Inc. and others.
   4 *   License & terms of use: http://www.unicode.org/copyright.html#License
   5 *
   6 **************************************************************************
   7 **************************************************************************
   8 *
   9 *   Copyright (C) 2001-2006, International Business Machines
  10 *   Corporation and others.  All Rights Reserved.
  11 *
  12 **************************************************************************
  13 *
  14 *   ufortune - An ICU resources sample program
  15 *
  16 *      Demonstrates
  17 *         Defining resources for use by an application
  18 *         Compiling and packaging them into a dll
  19 *         Referencing the resource-containing dll from application code
  20 *         Loading resource data using ICU's API
  21 *
  22 *      Created Nov. 7, 2001  by Andy Heninger
  23 *
  24 *      ufortune is a variant of the Unix "fortune" command, with
  25 *               ICU resources that contain the fortune-cookie sayings.
  26 *               Using resources allows  fortunes in different languages to
  27 *               be selected based on locale.
  28 */
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <time.h>
  34
  35 #include "unicode/udata.h"     /* ICU API for data handling.                 */
  36 #include "unicode/ures.h"      /* ICU API for resource loading               */
  37 #include "unicode/ustdio.h"    /* ICU API for reading & writing Unicode data */
  38                                /*   to files, possibly including character   */
  39                                /*   set conversions.                         */
  40 #include "unicode/ustring.h"
  41
  42 #ifndef UFORTUNE_NOSETAPPDATA
  43 /*
  44  *  Resource Data Reference.  The data is packaged as a dll (or .so or
  45  *           whatever, depending on the platform) that exports a data
  46  *           symbol.  The application (that's us) references that symbol,
  47  *           here, and will pass the data address to ICU, which will then
  48  *           be able to fetch resources from the data.
  49  */
  50 extern  const void U_IMPORT *fortune_resources_dat;
  51 #endif
  52
  53 void u_write(const UChar *what, int len);
  54
  55
  56 /*
  57  *  main()   This one function is all of the application code.
  58  */
  59 int main(int argc, char **argv)
  60 {
  61     UBool              displayUsage  = FALSE;    /* Set true if command line err or help      */
  62                                                  /*   option was requested.                   */
  63     UBool              verbose       = FALSE;    /* Set true if -v command line option.       */
  64     char              *optionError   = NULL;     /* If command line contains an unrecognized  */
  65                                                  /*   option, this will point to it.          */
  66     char              *locale=NULL;              /* Locale name.  Null for system default,    */
  67                                                  /*   otherwise set from command line.        */
  68     const char *       programName   = argv[0];  /* Program invocation name.                  */
  69
  70
  71     UFILE             *u_stdout;                 /* Unicode stdout file.                      */
  72     UErrorCode         err           = U_ZERO_ERROR;   /* Error return, used for most ICU     */
  73                                                        /*   functions.                        */
  74
  75     UResourceBundle   *myResources;              /* ICU Resource "handles"                    */
  76     UResourceBundle   *fortunes_r;
  77
  78     int32_t            numFortunes;              /* Number of fortune strings available.      */
  79     int                i;
  80
  81     const UChar       *resString;                /* Points to strings fetched from Resources. */
  82     int32_t            len;
  83
  84
  85     /*  Process command line options.
  86      *     -l  locale          specify a locale
  87      *     -v                  verbose mode.  Display extra messages.
  88      *     -? or --help        display a usage line
  89      */
  90     for (i=1; i<argc; i++) {
  91         if (strcmp(argv[i], "-l") ==0) {
  92             if (++i < argc) {
  93                 locale = argv[i];
  94             }
  95             continue;
  96         }
  97         if (strcmp(argv[i], "-v") == 0) {
  98             verbose = TRUE;
  99             continue;}
 100         if (strcmp(argv[i], "-?") == 0 ||
 101             strcmp(argv[i], "--help") == 0) {
 102             displayUsage = TRUE;
 103             continue;}
 104         optionError = argv[i];
 105         displayUsage = TRUE;
 106         break;
 107     }
 108
 109     /* ICU's icuio package provides a convenient way to write Unicode
 110      *    data to stdout.  The string data that we get from resources
 111      *    will be UChar * strings, which icuio can handle nicely.
 112      */
 113     u_stdout = u_finit(stdout, NULL /*locale*/,  NULL /*codepage */);
 114     if (verbose) {
 115         u_fprintf(u_stdout, "%s:  checking output via icuio.\n", programName);
 116     }
 117
 118 #ifndef UFORTUNE_NOSETAPPDATA
 119     /* Tell ICU where our resource data is located in memory.
 120      *   The data lives in the Fortune_Resources dll, and we just
 121      *   pass the address of an exported symbol from that library
 122      *   to ICU.
 123      */
 124     udata_setAppData("fortune_resources", &fortune_resources_dat, &err);
 125     if (U_FAILURE(err)) {
 126         fprintf(stderr, "%s: udata_setAppData failed with error \"%s\"\n", programName, u_errorName(err));
 127         exit(-1);
 128     }
 129 #endif
 130
 131     /* Open our resources.
 132     */
 133     myResources = ures_open("fortune_resources", locale, &err);
 134     if (U_FAILURE(err)) {
 135         fprintf(stderr, "%s: ures_open failed with error \"%s\"\n", programName, u_errorName(err));
 136         exit(-1);
 137     }
 138     if (verbose) {
 139         u_fprintf(u_stdout, "status from ures_open(\"fortune_resources\", %s) is %s\n",
 140             locale? locale: " ", u_errorName(err));
 141     }
 142
 143     /*
 144      * Display any command line option usage errors and/or the
 145      *     usage help message.  These messages come from our resource bundle.
 146      */
 147     if (optionError != NULL) {
 148         const UChar *msg = ures_getStringByKey(myResources, "optionMessage", &len, &err);
 149         if (U_FAILURE(err)) {
 150             fprintf(stderr, "%s: ures_getStringByKey(\"optionMessage\") failed, %s\n",
 151                 programName, u_errorName(err));
 152             exit(-1);
 153         }
 154         u_file_write(msg,  len, u_stdout);              /* msg is UChar *, from resource    */
 155         u_fprintf(u_stdout, " %s\n", optionError);      /* optionError is char *, from argv */
 156     }
 157
 158     if (displayUsage) {
 159         const UChar *usage;
 160         int          returnValue=0;
 161
 162         usage = ures_getStringByKey(myResources, "usage", &len, &err);
 163         if (U_FAILURE(err)) {
 164             fprintf(stderr, "%s: ures_getStringByKey(\"usage\") failed, %s\n", programName, u_errorName(err));
 165             exit(-1);
 166         }
 167         u_file_write(usage,  len, u_stdout);
 168         if (optionError != NULL) {returnValue = -1;}
 169         return returnValue;
 170     }
 171
 172     /*
 173      * Open the "fortunes" resources from within the already open resources
 174      */
 175     fortunes_r = ures_getByKey(myResources, "fortunes", NULL, &err);
 176     if (U_FAILURE(err)) {
 177         fprintf(stderr, "%s: ures_getByKey(\"fortunes\") failed, %s\n", programName, u_errorName(err));
 178         exit(-1);
 179     }
 180
 181
 182     /*
 183      * Pick up and display a random fortune
 184      *
 185      */
 186     numFortunes = ures_countArrayItems(myResources, "fortunes", &err);
 187     if (U_FAILURE(err)) {
 188         fprintf(stderr, "%s: ures_countArrayItems(\"fortunes\") failed, %s\n", programName, u_errorName(err));
 189         exit(-1);
 190     }
 191     if (numFortunes <= 0) {
 192         fprintf(stderr, "%s: no fortunes found.\n", programName);
 193         exit(-1);
 194     }
 195
 196     i = (int)time(NULL) % numFortunes;    /*  Use time to pick a somewhat-random fortune.  */
 197     resString = ures_getStringByIndex(fortunes_r, i, &len, &err);
 198     if (U_FAILURE(err)) {
 199         fprintf(stderr, "%s: ures_getStringByIndex(%d) failed, %s\n", programName, i, u_errorName(err));
 200         exit(-1);
 201     }
 202
 203     u_file_write(resString, len, u_stdout);      /* Write out the message           */
 204         u_fputc(0x0a, u_stdout);                     /*   and a trailing newline            */
 205
 206     return 0;
 207 }
 208