src/common/utilscmn.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        utilscmn.cpp
   3 // Purpose:     Miscellaneous utility functions and classes
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     29/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Julian Smart
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "utils.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/defs.h"
  33     #include "wx/string.h"
  34     #include "wx/utils.h"
  35     #include "wx/intl.h"
  36     #include "wx/log.h"
  37
  38     #if wxUSE_GUI
  39         #include "wx/app.h"
  40         #include "wx/window.h"
  41         #include "wx/frame.h"
  42         #include "wx/menu.h"
  43         #include "wx/msgdlg.h"
  44         #include "wx/textdlg.h"
  45         #include "wx/textctrl.h"    // for wxTE_PASSWORD
  46         #if wxUSE_ACCEL
  47             #include "wx/menuitem.h"
  48             #include "wx/accel.h"
  49         #endif // wxUSE_ACCEL
  50     #endif // wxUSE_GUI
  51 #endif // WX_PRECOMP
  52
  53 #ifndef __WIN16__
  54 #include "wx/process.h"
  55 #include "wx/txtstrm.h"
  56 #endif
  57
  58 #include <ctype.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62
  63 #if !defined(__WATCOMC__)
  64     #if !(defined(_MSC_VER) && (_MSC_VER > 800))
  65         #include <errno.h>
  66     #endif
  67 #endif
  68
  69 #if wxUSE_GUI
  70     #include "wx/colordlg.h"
  71     #include "wx/notebook.h"
  72     #include "wx/frame.h"
  73     #include "wx/statusbr.h"
  74     #include "wx/toolbar.h"
  75 #endif // wxUSE_GUI
  76
  77 #include <time.h>
  78
  79 #ifndef __MWERKS__
  80     #include <sys/types.h>
  81     #include <sys/stat.h>
  82 #endif
  83
  84 #ifdef __SALFORDC__
  85     #include <clib.h>
  86 #endif
  87
  88 #ifdef __WXMSW__
  89     #include "wx/msw/private.h"
  90 #endif
  91
  92 // ----------------------------------------------------------------------------
  93 // function protoypes
  94 // ----------------------------------------------------------------------------
  95
  96 #if wxUSE_GUI
  97     static wxWindow *wxFindWindowByLabel1(const wxString& title, wxWindow *parent);
  98     static wxWindow *wxFindWindowByName1 (const wxString& title, wxWindow *parent);
  99 #endif // wxUSE_GUI
 100
 101 // ============================================================================
 102 // implementation
 103 // ============================================================================
 104
 105 // ----------------------------------------------------------------------------
 106 // string functions
 107 // ----------------------------------------------------------------------------
 108
 109 #if defined(__WXMAC__) && !defined(__DARWIN__)
 110 int strcasecmp(const char *str_1, const char *str_2)
 111 {
 112   register char c1, c2;
 113   do {
 114     c1 = tolower(*str_1++);
 115     c2 = tolower(*str_2++);
 116   } while ( c1 && (c1 == c2) );
 117
 118   return c1 - c2;
 119 }
 120
 121 int strncasecmp(const char *str_1, const char *str_2, size_t maxchar)
 122 {
 123
 124   register char c1, c2;
 125   while( maxchar--)
 126   {
 127     c1 = tolower(*str_1++);
 128     c2 = tolower(*str_2++);
 129
 130     if ( !c1 || c1!=c2 )
 131                   return c1 - c2;
 132
 133   } ;
 134
 135   return 0 ;
 136
 137 }
 138 #endif // __WXMAC__ && !__DARWIN__
 139
 140 #if defined( __VMS__ ) && ( __VMS_VER < 70000000 )
 141 // we have no strI functions under VMS, therefore I have implemented
 142 // an inefficient but portable version: convert copies of strings to lowercase
 143 // and then use the normal comparison
 144 static void myLowerString(char *s)
 145 {
 146   while(*s){
 147     if(isalpha(*s)) *s = (char)tolower(*s);
 148     s++;
 149   }
 150 }
 151
 152 int strcasecmp(const char *str_1, const char *str_2)
 153 {
 154   char *temp1 = new char[strlen(str_1)+1];
 155   char *temp2 = new char[strlen(str_2)+1];
 156   strcpy(temp1,str_1);
 157   strcpy(temp2,str_2);
 158   myLowerString(temp1);
 159   myLowerString(temp2);
 160
 161   int result = wxStrcmp(temp1,temp2);
 162   delete[] temp1;
 163   delete[] temp2;
 164
 165   return(result);
 166 }
 167
 168 int strncasecmp(const char *str_1, const char *str_2, size_t maxchar)
 169 {
 170   char *temp1 = new char[strlen(str_1)+1];
 171   char *temp2 = new char[strlen(str_2)+1];
 172   strcpy(temp1,str_1);
 173   strcpy(temp2,str_2);
 174   myLowerString(temp1);
 175   myLowerString(temp2);
 176
 177   int result = strncmp(temp1,temp2,maxchar);
 178   delete[] temp1;
 179   delete[] temp2;
 180
 181   return(result);
 182 }
 183 #endif // __VMS__
 184
 185 #if defined(__WINDOWS__) && !defined(__WXMICROWIN__)
 186
 187 #ifndef __GNUWIN32__
 188 #ifndef __MWERKS__
 189 #define strcasecmp stricmp
 190 #define strncasecmp strnicmp
 191 #else
 192 #define strcasecmp _stricmp
 193 #define strncasecmp _strnicmp
 194 #endif
 195 #endif
 196
 197 #else
 198
 199 #ifdef __EMX__
 200 #define strcasecmp stricmp
 201 #define strncasecmp strnicmp
 202 #endif
 203
 204 // This declaration is missing in SunOS!
 205 // (Yes, I know it is NOT ANSI-C but its in BSD libc)
 206 #if defined(__xlC) || defined(__AIX__) || defined(__GNUG__)
 207 extern "C"
 208 {
 209   int strcasecmp (const char *, const char *);
 210   int strncasecmp (const char *, const char *, size_t);
 211 }
 212 #endif
 213 #endif  /* __WXMSW__ */
 214
 215 #ifdef __WXPM__
 216 #define strcasecmp stricmp
 217 #define strncasecmp strnicmp
 218 #endif
 219
 220 wxChar *
 221 copystring (const wxChar *s)
 222 {
 223   if (s == NULL) s = wxT("");
 224   size_t len = wxStrlen (s) + 1;
 225
 226   wxChar *news = new wxChar[len];
 227   memcpy (news, s, len * sizeof(wxChar));    // Should be the fastest
 228
 229   return news;
 230 }
 231
 232 // Id generation
 233 static long wxCurrentId = 100;
 234
 235 long
 236 wxNewId (void)
 237 {
 238   return wxCurrentId++;
 239 }
 240
 241 long
 242 wxGetCurrentId(void) { return wxCurrentId; }
 243
 244 void
 245 wxRegisterId (long id)
 246 {
 247   if (id >= wxCurrentId)
 248     wxCurrentId = id + 1;
 249 }
 250
 251 void
 252 StringToFloat (const wxChar *s, float *number)
 253 {
 254   if (s && *s && number)
 255     *number = (float) wxStrtod (s, (wxChar **) NULL);
 256 }
 257
 258 void
 259 StringToDouble (const wxChar *s, double *number)
 260 {
 261   if (s && *s && number)
 262     *number = wxStrtod (s, (wxChar **) NULL);
 263 }
 264
 265 wxChar *
 266 FloatToString (float number, const wxChar *fmt)
 267 {
 268   static wxChar buf[256];
 269
 270   wxSprintf (buf, fmt, number);
 271   return buf;
 272 }
 273
 274 wxChar *
 275 DoubleToString (double number, const wxChar *fmt)
 276 {
 277   static wxChar buf[256];
 278
 279   wxSprintf (buf, fmt, number);
 280   return buf;
 281 }
 282
 283 void
 284 StringToInt (const wxChar *s, int *number)
 285 {
 286   if (s && *s && number)
 287     *number = (int) wxStrtol (s, (wxChar **) NULL, 10);
 288 }
 289
 290 void
 291 StringToLong (const wxChar *s, long *number)
 292 {
 293   if (s && *s && number)
 294     *number = wxStrtol (s, (wxChar **) NULL, 10);
 295 }
 296
 297 wxChar *
 298 IntToString (int number)
 299 {
 300   static wxChar buf[20];
 301
 302   wxSprintf (buf, wxT("%d"), number);
 303   return buf;
 304 }
 305
 306 wxChar *
 307 LongToString (long number)
 308 {
 309   static wxChar buf[20];
 310
 311   wxSprintf (buf, wxT("%ld"), number);
 312   return buf;
 313 }
 314
 315 // Array used in DecToHex conversion routine.
 316 static wxChar hexArray[] = wxT("0123456789ABCDEF");
 317
 318 // Convert 2-digit hex number to decimal
 319 int wxHexToDec(const wxString& buf)
 320 {
 321   int firstDigit, secondDigit;
 322
 323   if (buf.GetChar(0) >= wxT('A'))
 324     firstDigit = buf.GetChar(0) - wxT('A') + 10;
 325   else
 326     firstDigit = buf.GetChar(0) - wxT('0');
 327
 328   if (buf.GetChar(1) >= wxT('A'))
 329     secondDigit = buf.GetChar(1) - wxT('A') + 10;
 330   else
 331     secondDigit = buf.GetChar(1) - wxT('0');
 332
 333   return (firstDigit & 0xF) * 16 + (secondDigit & 0xF );
 334 }
 335
 336 // Convert decimal integer to 2-character hex string
 337 void wxDecToHex(int dec, wxChar *buf)
 338 {
 339   int firstDigit = (int)(dec/16.0);
 340   int secondDigit = (int)(dec - (firstDigit*16.0));
 341   buf[0] = hexArray[firstDigit];
 342   buf[1] = hexArray[secondDigit];
 343   buf[2] = 0;
 344 }
 345
 346 // Convert decimal integer to 2-character hex string
 347 wxString wxDecToHex(int dec)
 348 {
 349     wxChar buf[3];
 350     wxDecToHex(dec, buf);
 351     return wxString(buf);
 352 }
 353
 354 // Match a string INDEPENDENT OF CASE
 355 bool
 356 StringMatch (const char *str1, const char *str2, bool subString, bool exact)
 357 {
 358   if (str1 == NULL || str2 == NULL)
 359     return FALSE;
 360   if (str1 == str2)
 361     return TRUE;
 362
 363   if (subString)
 364     {
 365       int len1 = strlen (str1);
 366       int len2 = strlen (str2);
 367       int i;
 368
 369       // Search for str1 in str2
 370       // Slow .... but acceptable for short strings
 371       for (i = 0; i <= len2 - len1; i++)
 372         {
 373           if (strncasecmp (str1, str2 + i, len1) == 0)
 374             return TRUE;
 375         }
 376     }
 377   else if (exact)
 378     {
 379       if (strcasecmp (str1, str2) == 0)
 380         return TRUE;
 381     }
 382   else
 383     {
 384       int len1 = strlen (str1);
 385       int len2 = strlen (str2);
 386
 387       if (strncasecmp (str1, str2, wxMin (len1, len2)) == 0)
 388         return TRUE;
 389     }
 390
 391   return FALSE;
 392 }
 393
 394 // Return the current date/time
 395 // [volatile]
 396 wxString wxNow()
 397 {
 398   time_t now = time((time_t *) NULL);
 399   char *date = ctime(&now);
 400   date[24] = '\0';
 401   return wxString(date);
 402 }
 403
 404 #if wxUSE_GUI
 405
 406 #if wxUSE_MENUS
 407
 408 // ----------------------------------------------------------------------------
 409 // Menu accelerators related functions
 410 // ----------------------------------------------------------------------------
 411
 412 wxChar *wxStripMenuCodes(const wxChar *in, wxChar *out)
 413 {
 414     wxString s = wxMenuItem::GetLabelFromText(in);
 415     if ( out )
 416     {
 417         // go smash their buffer if it's not big enough - I love char * params
 418         memcpy(out, s.c_str(), s.length() * sizeof(wxChar));
 419     }
 420     else
 421     {
 422         out = copystring(s);
 423     }
 424
 425     return out;
 426 }
 427
 428 wxString wxStripMenuCodes(const wxString& in)
 429 {
 430     wxString out;
 431
 432     size_t len = in.length();
 433     out.reserve(len);
 434
 435     for ( size_t n = 0; n < len; n++ )
 436     {
 437         wxChar ch = in[n];
 438         if ( ch == _T('&') )
 439         {
 440             // skip it, it is used to introduce the accel char (or to quote
 441             // itself in which case it should still be skipped): note that it
 442             // can't be the last character of the string
 443             if ( ++n == len )
 444             {
 445                 wxLogDebug(_T("Invalid menu string '%s'"), in.c_str());
 446             }
 447             else
 448             {
 449                 // use the next char instead
 450                 ch = in[n];
 451             }
 452         }
 453         else if ( ch == _T('\t') )
 454         {
 455             // everything after TAB is accel string, exit the loop
 456             break;
 457         }
 458
 459         out += ch;
 460     }
 461
 462     return out;
 463 }
 464
 465 #endif // wxUSE_MENUS
 466
 467 // ----------------------------------------------------------------------------
 468 // Window search functions
 469 // ----------------------------------------------------------------------------
 470
 471 /*
 472  * If parent is non-NULL, look through children for a label or title
 473  * matching the specified string. If NULL, look through all top-level windows.
 474  *
 475  */
 476
 477 wxWindow *
 478 wxFindWindowByLabel (const wxString& title, wxWindow * parent)
 479 {
 480     if (parent)
 481     {
 482         return wxFindWindowByLabel1(title, parent);
 483     }
 484     else
 485     {
 486         for ( wxWindowList::Node * node = wxTopLevelWindows.GetFirst();
 487               node;
 488               node = node->GetNext() )
 489         {
 490             wxWindow *win = node->GetData();
 491             wxWindow *retwin = wxFindWindowByLabel1 (title, win);
 492             if (retwin)
 493                 return retwin;
 494         }                        // for()
 495
 496     }
 497     return (wxWindow *) NULL;
 498 }
 499
 500 // Recursive
 501 static wxWindow *
 502 wxFindWindowByLabel1 (const wxString& title, wxWindow * parent)
 503 {
 504     if (parent)
 505     {
 506         if (parent->GetLabel() == title)
 507             return parent;
 508     }
 509
 510     if (parent)
 511     {
 512         for ( wxWindowList::Node * node = parent->GetChildren().GetFirst();
 513               node;
 514               node = node->GetNext() )
 515         {
 516             wxWindow *win = (wxWindow *)node->GetData();
 517             wxWindow *retwin = wxFindWindowByLabel1 (title, win);
 518             if (retwin)
 519                 return retwin;
 520         }
 521
 522     }
 523
 524     return (wxWindow *) NULL;                        // Not found
 525 }
 526
 527 /*
 528  * If parent is non-NULL, look through children for a name
 529  * matching the specified string. If NULL, look through all top-level windows.
 530  *
 531  */
 532
 533 wxWindow *
 534 wxFindWindowByName (const wxString& title, wxWindow * parent)
 535 {
 536     if (parent)
 537     {
 538         return wxFindWindowByName1 (title, parent);
 539     }
 540     else
 541     {
 542         for ( wxWindowList::Node * node = wxTopLevelWindows.GetFirst();
 543               node;
 544               node = node->GetNext() )
 545         {
 546             wxWindow *win = node->GetData();
 547             wxWindow *retwin = wxFindWindowByName1 (title, win);
 548             if (retwin)
 549                 return retwin;
 550         }
 551
 552     }
 553
 554     // Failed? Try by label instead.
 555     return wxFindWindowByLabel(title, parent);
 556 }
 557
 558 // Recursive
 559 static wxWindow *
 560 wxFindWindowByName1 (const wxString& title, wxWindow * parent)
 561 {
 562   if (parent)
 563     {
 564             if ( parent->GetName() == title )
 565                         return parent;
 566     }
 567
 568   if (parent)
 569     {
 570       for (wxNode * node = parent->GetChildren().First (); node; node = node->Next ())
 571         {
 572           wxWindow *win = (wxWindow *) node->Data ();
 573           wxWindow *retwin = wxFindWindowByName1 (title, win);
 574           if (retwin)
 575             return retwin;
 576         }                        // for()
 577
 578     }
 579
 580   return (wxWindow *) NULL;                        // Not found
 581
 582 }
 583
 584 // Returns menu item id or -1 if none.
 585 int
 586 wxFindMenuItemId (wxFrame * frame, const wxString& menuString, const wxString& itemString)
 587 {
 588 #if wxUSE_MENUS
 589   wxMenuBar *menuBar = frame->GetMenuBar ();
 590   if ( menuBar )
 591       return menuBar->FindMenuItem (menuString, itemString);
 592 #endif // wxUSE_MENUS
 593
 594   return -1;
 595 }
 596
 597 // Try to find the deepest child that contains 'pt'.
 598 // We go backwards, to try to allow for controls that are spacially
 599 // within other controls, but are still siblings (e.g. buttons within
 600 // static boxes). Static boxes are likely to be created _before_ controls
 601 // that sit inside them.
 602 wxWindow* wxFindWindowAtPoint(wxWindow* win, const wxPoint& pt)
 603 {
 604     if (!win->IsShown())
 605         return NULL;
 606
 607     // Hack for wxNotebook case: at least in wxGTK, all pages
 608     // claim to be shown, so we must only deal with the selected one.
 609     if (win->IsKindOf(CLASSINFO(wxNotebook)))
 610     {
 611       wxNotebook* nb = (wxNotebook*) win;
 612       int sel = nb->GetSelection();
 613       if (sel >= 0)
 614       {
 615         wxWindow* child = nb->GetPage(sel);
 616         wxWindow* foundWin = wxFindWindowAtPoint(child, pt);
 617         if (foundWin)
 618            return foundWin;
 619       }
 620     }
 621     /* Doesn't work
 622     // Frame case
 623     else if (win->IsKindOf(CLASSINFO(wxFrame)))
 624     {
 625       // Pseudo-children that may not be mentioned in the child list
 626       wxWindowList extraChildren;
 627       wxFrame* frame = (wxFrame*) win;
 628       if (frame->GetStatusBar())
 629         extraChildren.Append(frame->GetStatusBar());
 630       if (frame->GetToolBar())
 631         extraChildren.Append(frame->GetToolBar());
 632
 633       wxNode* node = extraChildren.First();
 634       while (node)
 635       {
 636           wxWindow* child = (wxWindow*) node->Data();
 637           wxWindow* foundWin = wxFindWindowAtPoint(child, pt);
 638           if (foundWin)
 639             return foundWin;
 640           node = node->Next();
 641       }
 642     }
 643     */
 644
 645     wxNode* node = win->GetChildren().Last();
 646     while (node)
 647     {
 648         wxWindow* child = (wxWindow*) node->Data();
 649         wxWindow* foundWin = wxFindWindowAtPoint(child, pt);
 650         if (foundWin)
 651           return foundWin;
 652         node = node->Previous();
 653     }
 654
 655     wxPoint pos = win->GetPosition();
 656     wxSize sz = win->GetSize();
 657     if (win->GetParent())
 658     {
 659         pos = win->GetParent()->ClientToScreen(pos);
 660     }
 661
 662     wxRect rect(pos, sz);
 663     if (rect.Inside(pt))
 664         return win;
 665     else
 666         return NULL;
 667 }
 668
 669 wxWindow* wxGenericFindWindowAtPoint(const wxPoint& pt)
 670 {
 671     // Go backwards through the list since windows
 672     // on top are likely to have been appended most
 673     // recently.
 674     wxNode* node = wxTopLevelWindows.Last();
 675     while (node)
 676     {
 677         wxWindow* win = (wxWindow*) node->Data();
 678         wxWindow* found = wxFindWindowAtPoint(win, pt);
 679         if (found)
 680             return found;
 681         node = node->Previous();
 682     }
 683     return NULL;
 684 }
 685
 686 #endif // wxUSE_GUI
 687
 688 /*
 689 On Fri, 21 Jul 1995, Paul Craven wrote:
 690
 691 > Is there a way to find the path of running program's executable? I can get
 692 > my home directory, and the current directory, but I don't know how to get the
 693 > executable directory.
 694 >
 695
 696 The code below (warty as it is), does what you want on most Unix,
 697 DOS, and Mac platforms (it's from the ALS Prolog main).
 698
 699 || Ken Bowen      Applied Logic Systems, Inc.         PO Box 180,
 700 ||====            Voice:  +1 (617)965-9191            Newton Centre,
 701 ||                FAX:    +1 (617)965-1636            MA  02159  USA
 702                   Email:  ken@als.com        WWW: http://www.als.com
 703 ------------------------------------------------------------------------
 704 */
 705
 706 // This code is commented out but it may be integrated with wxWin at
 707 // a later date, after testing. Thanks Ken!
 708 #if 0
 709
 710 /*--------------------------------------------------------------------*
 711  | whereami is given a filename f in the form:  whereami(argv[0])
 712  | It returns the directory in which the executable file (containing
 713  | this code [main.c] ) may be found.  A dot will be returned to indicate
 714  | the current directory.
 715  *--------------------------------------------------------------------*/
 716
 717 static void
 718 whereami(name)
 719     char *name;
 720 {
 721     register char *cutoff = NULL;        /* stifle -Wall */
 722     register char *s;
 723     register char *t;
 724     int   cc;
 725     char  ebuf[4096];
 726
 727     /*
 728      * See if the file is accessible either through the current directory
 729      * or through an absolute path.
 730      */
 731
 732     if (access(name, R_OK) == 0) {
 733
 734         /*-------------------------------------------------------------*
 735          * The file was accessible without any other work.  But the current
 736          * working directory might change on us, so if it was accessible
 737          * through the cwd, then we should get it for later accesses.
 738          *-------------------------------------------------------------*/
 739
 740         t = imagedir;
 741         if (!absolute_pathname(name)) {
 742 #if defined(DOS) || defined(__WIN32__)
 743             int   drive;
 744             char *newrbuf;
 745
 746             newrbuf = imagedir;
 747 #ifndef __DJGPP__
 748             if (*(name + 1) == ':') {
 749                 if (*name >= 'a' && *name <= 'z')
 750                     drive = (int) (*name - 'a' + 1);
 751                 else
 752                     drive = (int) (*name - 'A' + 1);
 753                 *newrbuf++ = *name;
 754                 *newrbuf++ = *(name + 1);
 755                 *newrbuf++ = DIR_SEPARATOR;
 756             }
 757             else {
 758                 drive = 0;
 759                 *newrbuf++ = DIR_SEPARATOR;
 760             }
 761             if (getcwd(newrbuf, drive) == 0) {        /* } */
 762 #else
 763             if (getcwd(newrbuf, 1024) == 0) {        /* } */
 764 #endif
 765 #else  /* DOS */
 766 #ifdef HAVE_GETWD
 767             if (getwd(imagedir) == 0) {                /* } */
 768 #else  /* !HAVE_GETWD */
 769             if (getcwd(imagedir, 1024) == 0) {
 770 #endif /* !HAVE_GETWD */
 771 #endif /* DOS */
 772                 fatal_error(FE_GETCWD, 0);
 773             }
 774             for (; *t; t++)        /* Set t to end of buffer */
 775                 ;
 776             if (*(t - 1) == DIR_SEPARATOR)        /* leave slash if already
 777                                                  * last char
 778                                                  */
 779                 cutoff = t - 1;
 780             else {
 781                 cutoff = t;        /* otherwise put one in */
 782                 *t++ = DIR_SEPARATOR;
 783             }
 784         }
 785 #if (!defined(__MAC__) && !defined(__DJGPP__) && !defined(__GO32__) && !defined(__WIN32__))
 786         else
 787                 (*t++ = DIR_SEPARATOR);
 788 #endif
 789
 790         /*-------------------------------------------------------------*
 791          * Copy the rest of the string and set the cutoff if it was not
 792          * already set.  If the first character of name is a slash, cutoff
 793          * is not presently set but will be on the first iteration of the
 794          * loop below.
 795          *-------------------------------------------------------------*/
 796
 797         for ((*name == DIR_SEPARATOR ? (s = name+1) : (s = name));;) {
 798             if (*s == DIR_SEPARATOR)
 799                         cutoff = t;
 800             if (!(*t++ = *s++))
 801                         break;
 802         }
 803
 804     }
 805     else {
 806
 807         /*-------------------------------------------------------------*
 808          * Get the path list from the environment.  If the path list is
 809          * inaccessible for any reason, leave with fatal error.
 810          *-------------------------------------------------------------*/
 811
 812 #ifdef __MAC__
 813         if ((s = getenv("Commands")) == (char *) 0)
 814 #else
 815         if ((s = getenv("PATH")) == (char *) 0)
 816 #endif
 817             fatal_error(FE_PATH, 0);
 818
 819         /*
 820          * Copy path list into ebuf and set the source pointer to the
 821          * beginning of this buffer.
 822          */
 823
 824         strcpy(ebuf, s);
 825         s = ebuf;
 826
 827         for (;;) {
 828             t = imagedir;
 829             while (*s && *s != PATH_SEPARATOR)
 830                 *t++ = *s++;
 831             if (t > imagedir && *(t - 1) == DIR_SEPARATOR)
 832                 ;                /* do nothing -- slash already is in place */
 833             else
 834                 *t++ = DIR_SEPARATOR;        /* put in the slash */
 835             cutoff = t - 1;        /* set cutoff */
 836             strcpy(t, name);
 837             if (access(imagedir, R_OK) == 0)
 838                 break;
 839
 840             if (*s)
 841                 s++;                /* advance source pointer */
 842             else
 843                 fatal_error(FE_INFND, 0);
 844         }
 845
 846     }
 847
 848     /*-------------------------------------------------------------*
 849      | At this point the full pathname should exist in imagedir and
 850      | cutoff should be set to the final slash.  We must now determine
 851      | whether the file name is a symbolic link or not and chase it down
 852      | if it is.  Note that we reuse ebuf for getting the link.
 853      *-------------------------------------------------------------*/
 854
 855 #ifdef HAVE_SYMLINK
 856     while ((cc = readlink(imagedir, ebuf, 512)) != -1) {
 857         ebuf[cc] = 0;
 858         s = ebuf;
 859         if (*s == DIR_SEPARATOR) {
 860             t = imagedir;
 861         }
 862         else {
 863             t = cutoff + 1;
 864         }
 865         for (;;) {
 866             if (*s == DIR_SEPARATOR)
 867                 cutoff = t;        /* mark the last slash seen */
 868             if (!(*t++ = *s++))        /* copy the character */
 869                 break;
 870         }
 871     }
 872
 873 #endif /* HAVE_SYMLINK */
 874
 875     strcpy(imagename, cutoff + 1);        /* keep the image name */
 876     *(cutoff + 1) = 0;                /* chop off the filename part */
 877 }
 878
 879 #endif
 880
 881 #if wxUSE_GUI
 882
 883 // ----------------------------------------------------------------------------
 884 // GUI helpers
 885 // ----------------------------------------------------------------------------
 886
 887 /*
 888  * N.B. these convenience functions must be separate from msgdlgg.cpp, textdlgg.cpp
 889  * since otherwise the generic code may be pulled in unnecessarily.
 890  */
 891
 892 #if wxUSE_MSGDLG
 893
 894 int wxMessageBox(const wxString& message, const wxString& caption, long style,
 895                  wxWindow *parent, int WXUNUSED(x), int WXUNUSED(y) )
 896 {
 897     wxMessageDialog dialog(parent, message, caption, style);
 898
 899     int ans = dialog.ShowModal();
 900     switch ( ans )
 901     {
 902         case wxID_OK:
 903             return wxOK;
 904         case wxID_YES:
 905             return wxYES;
 906         case wxID_NO:
 907             return wxNO;
 908         case wxID_CANCEL:
 909             return wxCANCEL;
 910     }
 911
 912     wxFAIL_MSG( _T("unexpected return code from wxMessageDialog") );
 913
 914     return wxCANCEL;
 915 }
 916
 917 #endif // wxUSE_MSGDLG
 918
 919 #if wxUSE_TEXTDLG
 920
 921 wxString wxGetTextFromUser(const wxString& message, const wxString& caption,
 922                         const wxString& defaultValue, wxWindow *parent,
 923                         int x, int y, bool WXUNUSED(centre) )
 924 {
 925     wxString str;
 926     wxTextEntryDialog dialog(parent, message, caption, defaultValue, wxOK|wxCANCEL, wxPoint(x, y));
 927     if (dialog.ShowModal() == wxID_OK)
 928     {
 929         str = dialog.GetValue();
 930     }
 931
 932     return str;
 933 }
 934
 935 wxString wxGetPasswordFromUser(const wxString& message,
 936                                const wxString& caption,
 937                                const wxString& defaultValue,
 938                                wxWindow *parent)
 939 {
 940     wxString str;
 941     wxTextEntryDialog dialog(parent, message, caption, defaultValue,
 942                              wxOK | wxCANCEL | wxTE_PASSWORD);
 943     if ( dialog.ShowModal() == wxID_OK )
 944     {
 945         str = dialog.GetValue();
 946     }
 947
 948     return str;
 949 }
 950
 951 #endif // wxUSE_TEXTDLG
 952
 953 #if wxUSE_COLOURDLG
 954
 955 wxColour wxGetColourFromUser(wxWindow *parent, const wxColour& colInit)
 956 {
 957       wxColourData data;
 958       data.SetChooseFull(TRUE);
 959       if ( colInit.Ok() )
 960       {
 961           data.SetColour((wxColour &)colInit); // const_cast
 962       }
 963
 964       wxColour colRet;
 965       wxColourDialog dialog(parent, &data);
 966       if ( dialog.ShowModal() == wxID_OK )
 967       {
 968           colRet = dialog.GetColourData().GetColour();
 969       }
 970       //else: leave it invalid
 971
 972       return colRet;
 973 }
 974
 975 #endif // wxUSE_COLOURDLG
 976
 977 // ----------------------------------------------------------------------------
 978 // missing C RTL functions (FIXME shouldn't be here at all)
 979 // ----------------------------------------------------------------------------
 980
 981 #ifdef __MWERKS__
 982 char *strdup(const char *s)
 983 {
 984         return strcpy( (char*) malloc( strlen( s ) + 1 ) , s ) ;
 985 }
 986
 987 int isascii( int c )
 988 {
 989         return ( c >= 0 && c < 128 ) ;
 990 }
 991 #endif // __MWERKS__
 992
 993 // ----------------------------------------------------------------------------
 994 // wxSafeYield and supporting functions
 995 // ----------------------------------------------------------------------------
 996
 997 void wxEnableTopLevelWindows(bool enable)
 998 {
 999     wxWindowList::Node *node;
1000     for ( node = wxTopLevelWindows.GetFirst(); node; node = node->GetNext() )
1001         node->GetData()->Enable(enable);
1002 }
1003
1004 wxWindowDisabler::wxWindowDisabler(wxWindow *winToSkip)
1005 {
1006     // remember the top level windows which were already disabled, so that we
1007     // don't reenable them later
1008     m_winDisabled = NULL;
1009
1010     wxWindowList::Node *node;
1011     for ( node = wxTopLevelWindows.GetFirst(); node; node = node->GetNext() )
1012     {
1013         wxWindow *winTop = node->GetData();
1014         if ( winTop == winToSkip )
1015             continue;
1016
1017         if ( winTop->IsEnabled() )
1018         {
1019             winTop->Disable();
1020         }
1021         else
1022         {
1023             if ( !m_winDisabled )
1024             {
1025                 m_winDisabled = new wxWindowList;
1026             }
1027
1028             m_winDisabled->Append(winTop);
1029         }
1030     }
1031 }
1032
1033 wxWindowDisabler::~wxWindowDisabler()
1034 {
1035     wxWindowList::Node *node;
1036     for ( node = wxTopLevelWindows.GetFirst(); node; node = node->GetNext() )
1037     {
1038         wxWindow *winTop = node->GetData();
1039         if ( !m_winDisabled || !m_winDisabled->Find(winTop) )
1040         {
1041             winTop->Enable();
1042         }
1043         //else: had been already disabled, don't reenable
1044     }
1045
1046     delete m_winDisabled;
1047 }
1048
1049 // Yield to other apps/messages and disable user input to all windows except
1050 // the given one
1051 bool wxSafeYield(wxWindow *win)
1052 {
1053     wxWindowDisabler wd(win);
1054
1055     bool rc = wxYield();
1056
1057     return rc;
1058 }
1059
1060 // ----------------------------------------------------------------------------
1061 // misc functions
1062 // ----------------------------------------------------------------------------
1063
1064 // Don't synthesize KeyUp events holding down a key and producing KeyDown
1065 // events with autorepeat. On by default and always on in wxMSW. wxGTK version
1066 // in utilsgtk.cpp.
1067 #ifndef __WXGTK__
1068 bool wxSetDetectableAutoRepeat( bool WXUNUSED(flag) )
1069 {
1070     return TRUE;    // detectable auto-repeat is the only mode MSW supports
1071 }
1072 #endif // !wxGTK
1073
1074 #endif // wxUSE_GUI
1075
1076 const wxChar *wxGetInstallPrefix()
1077 {
1078     wxString prefix;
1079
1080     if ( wxGetEnv(wxT("WX_PREFIX"), &prefix) )
1081         return prefix.c_str();
1082
1083 #ifdef wxINSTALL_PREFIX
1084     return wxT(wxINSTALL_PREFIX);
1085 #else
1086     return wxT("");
1087 #endif
1088 }
1089
1090
1091 // ----------------------------------------------------------------------------
1092 // network and user id functions
1093 // ----------------------------------------------------------------------------
1094
1095 // Get Full RFC822 style email address
1096 bool wxGetEmailAddress(wxChar *address, int maxSize)
1097 {
1098     wxString email = wxGetEmailAddress();
1099     if ( !email )
1100         return FALSE;
1101
1102     wxStrncpy(address, email, maxSize - 1);
1103     address[maxSize - 1] = wxT('\0');
1104
1105     return TRUE;
1106 }
1107
1108 wxString wxGetEmailAddress()
1109 {
1110     wxString email;
1111
1112     wxString host = wxGetFullHostName();
1113     if ( !!host )
1114     {
1115         wxString user = wxGetUserId();
1116         if ( !!user )
1117         {
1118             email << user << wxT('@') << host;
1119         }
1120     }
1121
1122     return email;
1123 }
1124
1125 wxString wxGetUserId()
1126 {
1127     static const int maxLoginLen = 256; // FIXME arbitrary number
1128
1129     wxString buf;
1130     bool ok = wxGetUserId(buf.GetWriteBuf(maxLoginLen), maxLoginLen);
1131     buf.UngetWriteBuf();
1132
1133     if ( !ok )
1134         buf.Empty();
1135
1136     return buf;
1137 }
1138
1139 wxString wxGetUserName()
1140 {
1141     static const int maxUserNameLen = 1024; // FIXME arbitrary number
1142
1143     wxString buf;
1144     bool ok = wxGetUserName(buf.GetWriteBuf(maxUserNameLen), maxUserNameLen);
1145     buf.UngetWriteBuf();
1146
1147     if ( !ok )
1148         buf.Empty();
1149
1150     return buf;
1151 }
1152
1153 wxString wxGetHostName()
1154 {
1155     static const size_t hostnameSize = 257;
1156
1157     wxString buf;
1158     bool ok = wxGetHostName(buf.GetWriteBuf(hostnameSize), hostnameSize);
1159
1160     buf.UngetWriteBuf();
1161
1162     if ( !ok )
1163         buf.Empty();
1164
1165     return buf;
1166 }
1167
1168 wxString wxGetFullHostName()
1169 {
1170     static const size_t hostnameSize = 257;
1171
1172     wxString buf;
1173     bool ok = wxGetFullHostName(buf.GetWriteBuf(hostnameSize), hostnameSize);
1174
1175     buf.UngetWriteBuf();
1176
1177     if ( !ok )
1178         buf.Empty();
1179
1180     return buf;
1181 }
1182
1183 wxString wxGetHomeDir()
1184 {
1185     wxString home;
1186     wxGetHomeDir(&home);
1187
1188     return home;
1189 }
1190
1191 #if 0
1192
1193 wxString wxGetCurrentDir()
1194 {
1195     wxString dir;
1196     size_t len = 1024;
1197     bool ok;
1198     do
1199     {
1200         ok = getcwd(dir.GetWriteBuf(len + 1), len) != NULL;
1201         dir.UngetWriteBuf();
1202
1203         if ( !ok )
1204         {
1205             if ( errno != ERANGE )
1206             {
1207                 wxLogSysError(_T("Failed to get current directory"));
1208
1209                 return wxEmptyString;
1210             }
1211             else
1212             {
1213                 // buffer was too small, retry with a larger one
1214                 len *= 2;
1215             }
1216         }
1217         //else: ok
1218     } while ( !ok );
1219
1220     return dir;
1221 }
1222
1223 #endif // 0
1224
1225 // ----------------------------------------------------------------------------
1226 // wxExecute
1227 // ----------------------------------------------------------------------------
1228
1229 // this is a private function because it hasn't a clean interface: the first
1230 // array is passed by reference, the second by pointer - instead we have 2
1231 // public versions of wxExecute() below
1232 static long wxDoExecuteWithCapture(const wxString& command,
1233                                    wxArrayString& output,
1234                                    wxArrayString* error)
1235 {
1236 #ifdef __WIN16__
1237     wxFAIL_MSG("Sorry, this version of wxExecute not implemented on WIN16.");
1238
1239     return 0;
1240 #else // !Win16
1241     // create a wxProcess which will capture the output
1242     wxProcess *process = new wxProcess;
1243     process->Redirect();
1244
1245     long rc = wxExecute(command, TRUE /* sync */, process);
1246
1247 #if wxUSE_STREAMS
1248     if ( rc != -1 )
1249     {
1250         wxInputStream* is = process->GetInputStream();
1251         wxCHECK_MSG( is, -1, _T("if wxExecute() succeded, stream can't be NULL") );
1252         wxTextInputStream tis(*is);
1253
1254         wxTextInputStream *tes = NULL;
1255         wxInputStream *es = NULL;
1256         if ( error )
1257         {
1258             es = process->GetErrorStream();
1259
1260             wxCHECK_MSG( es, -1, _T("stderr can't be NULL") );
1261
1262             tes = new wxTextInputStream(*es);
1263         }
1264
1265         bool cont;
1266         do
1267         {
1268             cont = FALSE;
1269
1270             if ( !is->Eof() && is->IsOk() )
1271             {
1272                 wxString line = tis.ReadLine();
1273                 if ( is->LastError() )
1274                     break;
1275
1276                 cont = TRUE;
1277
1278                 output.Add(line);
1279             }
1280
1281             if ( error && !es->Eof() && es->IsOk() )
1282             {
1283                 wxString line = tes->ReadLine();
1284                 if ( es->LastError() )
1285                     break;
1286
1287                 cont = TRUE;
1288
1289                 error->Add(line);
1290             }
1291         }
1292         while ( cont );
1293
1294         delete tes;
1295     }
1296 #endif // wxUSE_STREAMS
1297
1298     delete process;
1299
1300     return rc;
1301 #endif // IO redirection supoprted
1302 }
1303
1304 long wxExecute(const wxString& command, wxArrayString& output)
1305 {
1306     return wxDoExecuteWithCapture(command, output, NULL);
1307 }
1308
1309 long wxExecute(const wxString& command,
1310                wxArrayString& output,
1311                wxArrayString& error)
1312 {
1313     return wxDoExecuteWithCapture(command, output, &error);
1314 }
1315
1316 // ----------------------------------------------------------------------------
1317 // wxApp::Yield() wrappers for backwards compatibility
1318 // ----------------------------------------------------------------------------
1319
1320 bool wxYield()
1321 {
1322 #if wxUSE_GUI
1323     return wxTheApp && wxTheApp->Yield();
1324 #else
1325     return FALSE;
1326 #endif
1327 }
1328
1329 bool wxYieldIfNeeded()
1330 {
1331 #if wxUSE_GUI
1332     return wxTheApp && wxTheApp->Yield(TRUE);
1333 #else
1334     return FALSE;
1335 #endif
1336 }
1337