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| 2 | /*
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| 3 | *@@sourcefile nlscache.c:
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| 4 | *
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| 5 | * Usage: All OS/2 programs.
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| 6 | *
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| 7 | * Function prefixes (new with V0.81):
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| 8 | * -- stc*
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| 9 | *
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| 10 | * This file is new with V0.9.19, but contains functions
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| 11 | * formerly in nls.c.
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| 12 | *
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| 13 | * Note: Version numbering in this file relates to XWorkplace version
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| 14 | * numbering.
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| 15 | *
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| 16 | *@@header "helpers\nlscache.h"
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| 17 | *@@added V0.9.19 (2002-06-13) [umoeller]
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| 18 | */
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| 19 |
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| 20 | /*
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| 21 | * Copyright (C) 2001-2005 Ulrich Mller.
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| 22 | * This file is part of the "XWorkplace helpers" source package.
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| 23 | * This is free software; you can redistribute it and/or modify
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| 24 | * it under the terms of the GNU General Public License as published
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| 25 | * by the Free Software Foundation, in version 2 as it comes in the
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| 26 | * "COPYING" file of the XWorkplace main distribution.
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| 27 | * This program is distributed in the hope that it will be useful,
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| 28 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 29 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 30 | * GNU General Public License for more details.
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| 31 | */
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| 32 |
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| 33 | #define OS2EMX_PLAIN_CHAR
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| 34 | // this is needed for "os2emx.h"; if this is defined,
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| 35 | // emx will define PSZ as _signed_ char, otherwise
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| 36 | // as unsigned char
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| 37 |
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| 38 | #define INCL_DOSNLS
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| 39 | #define INCL_DOSDATETIME
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| 40 | #define INCL_DOSSEMAPHORES
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| 41 | #define INCL_DOSEXCEPTIONS
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| 42 | #define INCL_DOSPROCESS
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| 43 | #define INCL_DOSERRORS
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| 44 | #define INCL_WINSHELLDATA
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| 45 | #include <os2.h>
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| 46 |
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| 47 | #include <stdlib.h>
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| 48 | #include <stdio.h>
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| 49 | #include <string.h>
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| 50 | #include <math.h>
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| 51 | #include <setjmp.h>
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| 52 |
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| 53 | // XWP's setup.h replaces strchr and the like, and
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| 54 | // we want the originals in here
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| 55 | #define DONT_REPLACE_FOR_DBCS
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| 56 | #include "setup.h" // code generation and debugging options
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| 57 |
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| 58 | #include "helpers\except.h"
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| 59 | #include "helpers\nls.h"
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| 60 | #include "helpers\nlscache.h"
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| 61 | #include "helpers\prfh.h"
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| 62 | #include "helpers\standards.h"
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| 63 | #include "helpers\stringh.h"
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| 64 | #include "helpers\tree.h"
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| 65 | #include "helpers\xstring.h"
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| 66 |
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| 67 | #pragma hdrstop
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| 68 |
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| 69 | /*
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| 70 | *@@category: Helpers\National Language Support\String cache
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| 71 | * See nls.c.
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| 72 | */
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| 73 |
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| 74 | /* ******************************************************************
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| 75 | *
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| 76 | * NLS string cache
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| 77 | *
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| 78 | ********************************************************************/
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| 79 |
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| 80 | static HAB G_hab = NULLHANDLE;
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| 81 | static HMODULE G_hmod = NULLHANDLE;
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| 82 | static PCSTRINGENTITY G_paEntities = NULL;
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| 83 | static ULONG G_cEntities = 0;
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| 84 |
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| 85 | /*
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| 86 | *@@ ReplaceEntities:
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| 87 | *
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| 88 | *@@added V0.9.16 (2001-09-29) [umoeller]
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| 89 | */
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| 90 |
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| 91 | STATIC ULONG ReplaceEntities(PXSTRING pstr)
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| 92 | {
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| 93 | ULONG ul,
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| 94 | rc = 0;
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| 95 |
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| 96 | for (ul = 0;
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| 97 | ul < G_cEntities;
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| 98 | ul++)
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| 99 | {
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| 100 | ULONG ulOfs = 0;
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| 101 | PCSTRINGENTITY pThis = &G_paEntities[ul];
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| 102 | while (xstrFindReplaceC(pstr,
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| 103 | &ulOfs,
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| 104 | pThis->pcszEntity,
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| 105 | *(pThis->ppcszString)))
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| 106 | rc++;
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| 107 | }
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| 108 |
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| 109 | return (rc);
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| 110 | }
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| 111 |
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| 112 | /*
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| 113 | *@@ LoadString:
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| 114 | *
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| 115 | *@@added V0.9.18 (2002-03-08) [umoeller]
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| 116 | */
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| 117 |
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| 118 | STATIC void LoadString(ULONG ulID,
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| 119 | PSZ *ppsz,
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| 120 | PULONG pulLength) // out: length of new string (ptr can be NULL)
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| 121 | {
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| 122 | CHAR szBuf[500];
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| 123 | XSTRING str;
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| 124 |
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| 125 | if (*ppsz)
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| 126 | free(*ppsz);
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| 127 |
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| 128 | if (!WinLoadString(G_hab,
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| 129 | G_hmod,
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| 130 | ulID,
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| 131 | sizeof(szBuf),
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| 132 | szBuf))
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| 133 | // loading failed:
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| 134 | sprintf(szBuf,
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| 135 | "LoadString error: string resource %d not found in module 0x%lX",
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| 136 | ulID,
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| 137 | G_hmod);
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| 138 |
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| 139 | xstrInitCopy(&str, szBuf, 0);
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| 140 | ReplaceEntities(&str);
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| 141 | *ppsz = str.psz;
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| 142 | if (pulLength)
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| 143 | *pulLength = str.ulLength;
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| 144 | // do not free string
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| 145 | }
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| 146 |
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| 147 | STATIC HMTX G_hmtxStringsCache = NULLHANDLE;
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| 148 | STATIC TREE *G_StringsCache;
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| 149 | STATIC LONG G_cStringsInCache = 0;
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| 150 |
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| 151 | /*
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| 152 | *@@ LockStrings:
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| 153 | *
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| 154 | *@@added V0.9.9 (2001-04-04) [umoeller]
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| 155 | */
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| 156 |
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| 157 | STATIC BOOL LockStrings(VOID)
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| 158 | {
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| 159 | BOOL brc = FALSE;
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| 160 |
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| 161 | if (G_hmtxStringsCache == NULLHANDLE)
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| 162 | {
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| 163 | brc = !DosCreateMutexSem(NULL,
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| 164 | &G_hmtxStringsCache,
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| 165 | 0,
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| 166 | TRUE);
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| 167 | treeInit(&G_StringsCache,
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| 168 | &G_cStringsInCache);
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| 169 | }
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| 170 | else
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| 171 | brc = !DosRequestMutexSem(G_hmtxStringsCache, SEM_INDEFINITE_WAIT);
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| 172 |
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| 173 | return brc;
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| 174 | }
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| 175 |
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| 176 | /*
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| 177 | *@@ UnlockStrings:
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| 178 | *
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| 179 | *@@added V0.9.9 (2001-04-04) [umoeller]
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| 180 | */
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| 181 |
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| 182 | STATIC VOID UnlockStrings(VOID)
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| 183 | {
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| 184 | DosReleaseMutexSem(G_hmtxStringsCache);
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| 185 | }
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| 186 |
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| 187 | /*
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| 188 | *@@ STRINGTREENODE:
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| 189 | * internal string node structure for cmnGetString.
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| 190 | *
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| 191 | *@@added V0.9.9 (2001-04-04) [umoeller]
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| 192 | *@@changed V0.9.16 (2002-01-26) [umoeller]: no longer using malloc() for string
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| 193 | */
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| 194 |
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| 195 | typedef struct _STRINGTREENODE
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| 196 | {
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| 197 | TREE Tree; // tree node (src\helpers\tree.c)
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| 198 | CHAR szLoaded[1]; // string that was loaded;
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| 199 | // the struct is dynamic in size now
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| 200 | // V0.9.16 (2002-01-26) [umoeller]
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| 201 | } STRINGTREENODE, *PSTRINGTREENODE;
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| 202 |
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| 203 | /*
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| 204 | *@@ nlsInitStrings:
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| 205 | * initializes the NLS strings cache. Call this
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| 206 | * before calling nlsGetString for the first time.
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| 207 | *
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| 208 | *@@added V0.9.18 (2002-03-08) [umoeller]
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| 209 | */
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| 210 |
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| 211 | VOID nlsInitStrings(HAB hab, // in: anchor block
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| 212 | HMODULE hmod, // in: module handle to load strings from
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| 213 | PCSTRINGENTITY paEntities, // in: entities array or NULL
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| 214 | ULONG cEntities) // in: array item count of paEntities or 0
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| 215 | {
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| 216 | G_hab = hab;
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| 217 | G_hmod = hmod;
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| 218 | G_paEntities = paEntities;
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| 219 | G_cEntities = cEntities;
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| 220 | }
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| 221 |
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| 222 | /*
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| 223 | *@@ nlsGetString:
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| 224 | * returns a resource NLS string.
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| 225 | *
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| 226 | * Before calling this for the first time, initialize
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| 227 | * the engine with nlsInitStrings.
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| 228 | *
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| 229 | * After that, this function implements a fast string
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| 230 | * cache for various NLS strings. Compared to the
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| 231 | * standard method, this has the following advantages:
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| 232 | *
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| 233 | * -- Memory is only consumed for strings that are actually
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| 234 | * used. The NLSSTRINGS array had become terribly big,
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| 235 | * and lots of strings were loaded that were never used.
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| 236 | *
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| 237 | * -- Program startup should be a bit faster because we don't
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| 238 | * have to load a thousand strings at startup.
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| 239 | *
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| 240 | * -- The memory buffer holding the string is probably close
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| 241 | * to the rest of the heap data that the caller allocated,
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| 242 | * so this might lead to less memory page fragmentation.
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| 243 | *
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| 244 | * -- To add a new NLS string, before this mechanism existed,
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| 245 | * three files had to be changed (and kept in sync): common.h
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| 246 | * to add a field to the NLSSTRINGS structure, dlgids.h to
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| 247 | * add the string ID, and xfldrXXX.rc to add the resource.
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| 248 | * With the new mechanism, there's no need to change common.h
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| 249 | * any more, so the danger of forgetting something is a bit
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| 250 | * reduced. Anyway, fewer recompiles are needed (maybe),
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| 251 | * and sending in patches to the code is a bit easier.
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| 252 | *
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| 253 | * On input, specify a string resouce ID that exists
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| 254 | * in the hmod that was given to nlsInitStrings.
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| 255 | *
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| 256 | * The way this works is that the function maintains a
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| 257 | * fast cache of string IDs and only loads the string
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| 258 | * resources on demand from the given NLS DLL. If a
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| 259 | * string ID is queried for the first time, the string
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| 260 | * is loaded. Otherwise the cached copy is returned.
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| 261 | *
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| 262 | * There is a slight overhead to this function compared to
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| 263 | * simply getting a static string from an array, because
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| 264 | * the cache needs to be searched for the string ID. However,
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| 265 | * this uses a binary tree (balanced according to string IDs)
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| 266 | * internally, so this is quite fast still.
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| 267 | *
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| 268 | * This never releases the strings again.
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| 269 | *
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| 270 | * This never returns NULL. Even if loading the string failed,
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| 271 | * a string is returned; in that case, it's a meaningful error
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| 272 | * message specifying the ID that failed.
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| 273 | *
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| 274 | *@@added V0.9.9 (2001-04-04) [umoeller]
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| 275 | *@@changed V0.9.16 (2001-10-19) [umoeller]: fixed bad string count which was never set
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| 276 | *@@changed V0.9.16 (2002-01-26) [umoeller]: optimized heap locality
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| 277 | */
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| 278 |
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| 279 | PCSZ nlsGetString(ULONG ulStringID)
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| 280 | {
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| 281 | volatile BOOL fLocked = FALSE; // XWP V1.0.4 (2005-10-09) [pr]
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| 282 | PSZ pszReturn = "Error";
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| 283 |
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| 284 | TRY_LOUD(excpt1)
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| 285 | {
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| 286 | if (fLocked = LockStrings())
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| 287 | {
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| 288 | PSTRINGTREENODE pNode;
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| 289 |
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| 290 | if (pNode = (PSTRINGTREENODE)treeFind(G_StringsCache,
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| 291 | ulStringID,
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| 292 | treeCompareKeys))
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| 293 | // already loaded:
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| 294 | pszReturn = pNode->szLoaded;
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| 295 | else
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| 296 | {
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| 297 | // not loaded: load now
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| 298 | PSZ psz = NULL;
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| 299 | ULONG ulLength = 0;
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| 300 |
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| 301 | LoadString(ulStringID,
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| 302 | &psz,
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| 303 | &ulLength);
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| 304 |
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| 305 | if ( (!psz)
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| 306 | || (!(pNode = (PSTRINGTREENODE)malloc( sizeof(STRINGTREENODE)
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| 307 | // has one byte for null
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| 308 | // terminator already
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| 309 | + ulLength)))
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| 310 | )
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| 311 | pszReturn = "malloc() failed.";
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| 312 | else
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| 313 | {
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| 314 | pNode->Tree.ulKey = ulStringID;
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| 315 | memcpy(pNode->szLoaded,
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| 316 | psz,
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| 317 | ulLength + 1);
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| 318 | treeInsert(&G_StringsCache,
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| 319 | &G_cStringsInCache, // fixed V0.9.16 (2001-10-19) [umoeller]
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| 320 | (TREE*)pNode,
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| 321 | treeCompareKeys);
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| 322 | pszReturn = pNode->szLoaded;
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| 323 | }
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| 324 |
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| 325 | if (psz)
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| 326 | free(psz);
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| 327 | }
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| 328 | }
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| 329 | else
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| 330 | // we must always return a string, never NULL
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| 331 | pszReturn = "Cannot get strings lock.";
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| 332 | }
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| 333 | CATCH(excpt1)
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| 334 | {
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| 335 | pszReturn = "Error";
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| 336 | }
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| 337 | END_CATCH();
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| 338 |
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| 339 | if (fLocked)
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| 340 | UnlockStrings();
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| 341 |
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| 342 | return (pszReturn);
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| 343 | }
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| 344 |
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| 345 |
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