Check in the pristine copy of ICU 4.6...

icu46/source/common/icuplug.c

+/*
+******************************************************************************
+*
+*   Copyright (C) 2009-2010, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+******************************************************************************
+*
+*  FILE NAME : icuplug.c
+*
+*   Date         Name        Description
+*   10/29/2009   sl          New.
+******************************************************************************
+*/
+
+#include "unicode/icuplug.h"
+#include "icuplugimp.h"
+#include "cstring.h"
+#include "cmemory.h"
+#include "putilimp.h"
+#include "ucln.h"
+#include <stdio.h>
+
+#ifndef UPLUG_TRACE
+#define UPLUG_TRACE 0
+#endif
+
+#if UPLUG_TRACE
+#include <stdio.h>
+#define DBG(x) fprintf(stderr, "%s:%d: ",__FILE__,__LINE__); fprintf x
+#endif
+
+/**
+ * Internal structure of an ICU plugin. 
+ */
+
+struct UPlugData {
+  UPlugEntrypoint  *entrypoint; /**< plugin entrypoint */
+  uint32_t structSize;    /**< initialized to the size of this structure */
+  uint32_t token;         /**< must be U_PLUG_TOKEN */
+  void *lib;              /**< plugin library, or NULL */
+  char libName[UPLUG_NAME_MAX];   /**< library name */
+  char sym[UPLUG_NAME_MAX];        /**< plugin symbol, or NULL */
+  char config[UPLUG_NAME_MAX];     /**< configuration data */
+  void *context;          /**< user context data */
+  char name[UPLUG_NAME_MAX];   /**< name of plugin */
+  UPlugLevel  level; /**< level of plugin */
+  UBool   awaitingLoad; /**< TRUE if the plugin is awaiting a load call */
+  UBool   dontUnload; /**< TRUE if plugin must stay resident (leak plugin and lib) */
+  UErrorCode pluginStatus; /**< status code of plugin */
+};
+
+
+
+#define UPLUG_LIBRARY_INITIAL_COUNT 8
+#define UPLUG_PLUGIN_INITIAL_COUNT 12
+
+/**
+ * Remove an item
+ * @param list the full list
+ * @param listSize the number of entries in the list
+ * @param memberSize the size of one member
+ * @param itemToRemove the item number of the member
+ * @return the new listsize 
+ */
+static int32_t uplug_removeEntryAt(void *list, int32_t listSize, int32_t memberSize, int32_t itemToRemove) {
+  uint8_t *bytePtr = (uint8_t *)list;
+    
+  /* get rid of some bad cases first */
+  if(listSize<1) {
+    return listSize;
+  }
+    
+  /* is there anything to move? */
+  if(listSize > itemToRemove+1) {
+    memmove(bytePtr+(itemToRemove*memberSize), bytePtr+((itemToRemove+1)*memberSize), memberSize);
+  }
+    
+  return listSize-1;
+}
+
+
+
+
+#if U_ENABLE_DYLOAD
+/**
+ * Library management. Internal. 
+ * @internal
+ */
+struct UPlugLibrary;
+
+/**
+ * Library management. Internal. 
+ * @internal
+ */
+typedef struct UPlugLibrary {
+  void *lib;                           /**< library ptr */
+  char name[UPLUG_NAME_MAX]; /**< library name */
+  uint32_t ref;                        /**< reference count */
+} UPlugLibrary;
+
+static UPlugLibrary   staticLibraryList[UPLUG_LIBRARY_INITIAL_COUNT];
+static UPlugLibrary * libraryList = staticLibraryList;
+static int32_t libraryCount = 0;
+static int32_t libraryMax = UPLUG_LIBRARY_INITIAL_COUNT;
+
+/**
+ * Search for a library. Doesn't lock
+ * @param libName libname to search for
+ * @return the library's struct
+ */
+static int32_t searchForLibraryName(const char *libName) {
+  int32_t i;
+    
+  for(i=0;i<libraryCount;i++) {
+    if(!uprv_strcmp(libName, libraryList[i].name)) {
+      return i;
+    }
+  }
+  return -1;
+}
+
+static int32_t searchForLibrary(void *lib) {
+  int32_t i;
+    
+  for(i=0;i<libraryCount;i++) {
+    if(lib==libraryList[i].lib) {
+      return i;
+    }
+  }
+  return -1;
+}
+
+U_INTERNAL char * U_EXPORT2
+uplug_findLibrary(void *lib, UErrorCode *status) {
+  int32_t libEnt;
+  char *ret = NULL;
+  if(U_FAILURE(*status)) {
+    return NULL;
+  }
+  libEnt = searchForLibrary(lib);
+  if(libEnt!=-1) { 
+    ret = libraryList[libEnt].name;
+  } else {
+    *status = U_MISSING_RESOURCE_ERROR;
+  }
+  return ret;
+}
+
+U_INTERNAL void * U_EXPORT2
+uplug_openLibrary(const char *libName, UErrorCode *status) {
+  int32_t libEntry = -1;
+  void *lib = NULL;
+    
+  if(U_FAILURE(*status)) return NULL;
+
+  libEntry = searchForLibraryName(libName);
+  if(libEntry == -1) {
+    libEntry = libraryCount++;
+    if(libraryCount >= libraryMax) {
+      /* Ran out of library slots. Statically allocated because we can't depend on allocating memory.. */
+      *status = U_MEMORY_ALLOCATION_ERROR;
+#if UPLUG_TRACE
+      DBG((stderr, "uplug_openLibrary() - out of library slots (max %d)\n", libraryMax));
+#endif
+      return NULL;
+    }
+    /* Some operating systems don't want 
+       DL operations from multiple threads. */
+    libraryList[libEntry].lib = uprv_dl_open(libName, status);
+#if UPLUG_TRACE
+    DBG((stderr, "uplug_openLibrary(%s,%s) libEntry %d, lib %p\n", libName, u_errorName(*status), libEntry, lib));
+#endif
+        
+    if(libraryList[libEntry].lib == NULL || U_FAILURE(*status)) {
+      /* cleanup. */
+      libraryList[libEntry].lib = NULL; /* failure with open */
+      libraryList[libEntry].name[0] = 0;
+#if UPLUG_TRACE
+      DBG((stderr, "uplug_openLibrary(%s,%s) libEntry %d, lib %p\n", libName, u_errorName(*status), libEntry, lib));
+#endif
+      /* no need to free - just won't increase the count. */
+      libraryCount--;
+    } else { /* is it still there? */
+      /* link it in */
+      uprv_strncpy(libraryList[libEntry].name,libName,UPLUG_NAME_MAX);
+      libraryList[libEntry].ref=1;
+      lib = libraryList[libEntry].lib;
+    }
+
+  } else {
+    lib = libraryList[libEntry].lib;
+    libraryList[libEntry].ref++;
+  }
+  return lib;
+}
+
+U_INTERNAL void U_EXPORT2
+uplug_closeLibrary(void *lib, UErrorCode *status) {
+  int32_t i;
+    
+#if UPLUG_TRACE
+  DBG((stderr, "uplug_closeLibrary(%p,%s) list %p\n", lib, u_errorName(*status), (void*)libraryList));
+#endif
+  if(U_FAILURE(*status)) return;
+    
+  for(i=0;i<libraryCount;i++) {
+    if(lib==libraryList[i].lib) {
+      if(--(libraryList[i].ref) == 0) {
+        uprv_dl_close(libraryList[i].lib, status);
+        libraryCount = uplug_removeEntryAt(libraryList, libraryCount, sizeof(*libraryList), i);
+      }
+      return;
+    }
+  }
+  *status = U_INTERNAL_PROGRAM_ERROR; /* could not find the entry! */
+}
+
+#endif
+
+static UPlugData pluginList[UPLUG_PLUGIN_INITIAL_COUNT];
+static int32_t pluginCount = 0;
+
+
+
+  
+static int32_t uplug_pluginNumber(UPlugData* d) {
+  UPlugData *pastPlug = &pluginList[pluginCount];
+  if(d<=pluginList) {
+    return 0;
+  } else if(d>=pastPlug) {
+    return pluginCount;
+  } else {
+    return (d-pluginList)/sizeof(pluginList[0]);
+  }
+}
+
+
+U_CAPI UPlugData * U_EXPORT2
+uplug_nextPlug(UPlugData *prior) {
+  if(prior==NULL) {
+    return pluginList;
+  } else {
+    UPlugData *nextPlug = &prior[1];
+    UPlugData *pastPlug = &pluginList[pluginCount];
+    
+    if(nextPlug>=pastPlug) {
+      return NULL;
+    } else {
+      return nextPlug;
+    }
+  }
+}
+
+
+
+/**
+ * Call the plugin with some params
+ */
+static void uplug_callPlug(UPlugData *plug, UPlugReason reason, UErrorCode *status) {
+  UPlugTokenReturn token;
+  if(plug==NULL||U_FAILURE(*status)) {
+    return;
+  }
+  token = (*(plug->entrypoint))(plug, reason, status);
+  if(token!=UPLUG_TOKEN) {
+    *status = U_INTERNAL_PROGRAM_ERROR;
+  }
+}
+
+
+static void uplug_unloadPlug(UPlugData *plug, UErrorCode *status) {
+  if(plug->awaitingLoad) {  /* shouldn't happen. Plugin hasn'tbeen loaded yet.*/
+    *status = U_INTERNAL_PROGRAM_ERROR;
+    return; 
+  }
+  if(U_SUCCESS(plug->pluginStatus)) {
+    /* Don't unload a plug which has a failing load status - means it didn't actually load. */
+    uplug_callPlug(plug, UPLUG_REASON_UNLOAD, status);
+  }
+}
+
+static void uplug_queryPlug(UPlugData *plug, UErrorCode *status) {
+  if(!plug->awaitingLoad || !(plug->level == UPLUG_LEVEL_UNKNOWN) ) {  /* shouldn't happen. Plugin hasn'tbeen loaded yet.*/
+    *status = U_INTERNAL_PROGRAM_ERROR;
+    return; 
+  }
+  plug->level = UPLUG_LEVEL_INVALID;
+  uplug_callPlug(plug, UPLUG_REASON_QUERY, status);
+  if(U_SUCCESS(*status)) { 
+    if(plug->level == UPLUG_LEVEL_INVALID) {
+      plug->pluginStatus = U_PLUGIN_DIDNT_SET_LEVEL;
+      plug->awaitingLoad = FALSE;
+    }
+  } else {
+    plug->pluginStatus = U_INTERNAL_PROGRAM_ERROR;
+    plug->awaitingLoad = FALSE;
+  }
+}
+
+
+static void uplug_loadPlug(UPlugData *plug, UErrorCode *status) {
+  if(!plug->awaitingLoad || (plug->level < UPLUG_LEVEL_LOW) ) {  /* shouldn't happen. Plugin hasn'tbeen loaded yet.*/
+    *status = U_INTERNAL_PROGRAM_ERROR;
+    return;
+  }
+  uplug_callPlug(plug, UPLUG_REASON_LOAD, status);
+  plug->awaitingLoad = FALSE;
+  if(!U_SUCCESS(*status)) {
+    plug->pluginStatus = U_INTERNAL_PROGRAM_ERROR;
+  }
+}
+
+static UPlugData *uplug_allocateEmptyPlug(UErrorCode *status)
+{
+  UPlugData *plug = NULL;
+
+  if(U_FAILURE(*status)) {
+    return NULL;
+  }
+
+  if(pluginCount == UPLUG_PLUGIN_INITIAL_COUNT) {
+    *status = U_MEMORY_ALLOCATION_ERROR;
+    return NULL;
+  }
+
+  plug = &pluginList[pluginCount++];
+
+  plug->token = UPLUG_TOKEN;
+  plug->structSize = sizeof(UPlugData);
+  plug->name[0]=0;
+  plug->level = UPLUG_LEVEL_UNKNOWN; /* initialize to null state */
+  plug->awaitingLoad = TRUE;
+  plug->dontUnload = FALSE;
+  plug->pluginStatus = U_ZERO_ERROR;
+  plug->libName[0] = 0;
+  plug->config[0]=0;
+  plug->sym[0]=0;
+  plug->lib=NULL;
+  plug->entrypoint=NULL;
+
+
+  return plug;
+}
+
+static UPlugData *uplug_allocatePlug(UPlugEntrypoint *entrypoint, const char *config, void *lib, const char *symName,
+                                     UErrorCode *status) {
+  UPlugData *plug;
+
+  if(U_FAILURE(*status)) {
+    return NULL;
+  }
+
+  plug = uplug_allocateEmptyPlug(status);
+  if(config!=NULL) {
+    uprv_strncpy(plug->config, config, UPLUG_NAME_MAX);
+  } else {
+    plug->config[0] = 0;
+  }
+    
+  if(symName!=NULL) {
+    uprv_strncpy(plug->sym, symName, UPLUG_NAME_MAX);
+  } else {
+    plug->sym[0] = 0;
+  }
+    
+  plug->entrypoint = entrypoint;
+  plug->lib = lib;
+  uplug_queryPlug(plug, status);
+    
+  return plug;
+}
+
+static void uplug_deallocatePlug(UPlugData *plug, UErrorCode *status) {
+  UErrorCode subStatus = U_ZERO_ERROR;
+  if(!plug->dontUnload) {
+#if U_ENABLE_DYLOAD
+    uplug_closeLibrary(plug->lib, &subStatus);
+#endif
+  }
+  plug->lib = NULL;
+  if(U_SUCCESS(*status) && U_FAILURE(subStatus)) {
+    *status = subStatus;
+  }
+  /* shift plugins up and decrement count. */
+  if(U_SUCCESS(*status)) {
+    /* all ok- remove. */
+    pluginCount = uplug_removeEntryAt(pluginList, pluginCount, sizeof(plug[0]), uplug_pluginNumber(plug));
+  } else {
+    /* not ok- leave as a message. */
+    plug->awaitingLoad=FALSE;
+    plug->entrypoint=0;
+    plug->dontUnload=TRUE;
+  }
+}
+
+static void uplug_doUnloadPlug(UPlugData *plugToRemove, UErrorCode *status) {
+  if(plugToRemove != NULL) {
+    uplug_unloadPlug(plugToRemove, status);
+    uplug_deallocatePlug(plugToRemove, status);
+  }
+}
+
+U_CAPI void U_EXPORT2
+uplug_removePlug(UPlugData *plug, UErrorCode *status)  {
+  UPlugData *cursor = NULL;
+  UPlugData *plugToRemove = NULL;
+  if(U_FAILURE(*status)) return;
+    
+  for(cursor=pluginList;cursor!=NULL;) {
+    if(cursor==plug) {
+      plugToRemove = plug;
+      cursor=NULL;
+    } else {
+      cursor = uplug_nextPlug(cursor);
+    }
+  }
+    
+  uplug_doUnloadPlug(plugToRemove, status);
+}
+
+
+
+
+U_CAPI void U_EXPORT2 
+uplug_setPlugNoUnload(UPlugData *data, UBool dontUnload)
+{
+  data->dontUnload = dontUnload;
+}
+
+
+U_CAPI void U_EXPORT2
+uplug_setPlugLevel(UPlugData *data, UPlugLevel level) {
+  data->level = level;
+}
+
+
+U_CAPI UPlugLevel U_EXPORT2
+uplug_getPlugLevel(UPlugData *data) {
+  return data->level;
+}
+
+
+U_CAPI void U_EXPORT2
+uplug_setPlugName(UPlugData *data, const char *name) {
+  uprv_strncpy(data->name, name, UPLUG_NAME_MAX);
+}
+
+
+U_CAPI const char * U_EXPORT2
+uplug_getPlugName(UPlugData *data) {
+  return data->name;
+}
+
+
+U_CAPI const char * U_EXPORT2
+uplug_getSymbolName(UPlugData *data) {
+  return data->sym;
+}
+
+U_CAPI const char * U_EXPORT2
+uplug_getLibraryName(UPlugData *data, UErrorCode *status) {
+  if(data->libName[0]) {
+    return data->libName;
+  } else {
+#if U_ENABLE_DYLOAD
+    return uplug_findLibrary(data->lib, status);
+#else
+    return NULL;
+#endif
+  }
+}
+
+U_CAPI void * U_EXPORT2
+uplug_getLibrary(UPlugData *data) {
+  return data->lib;
+}
+
+U_CAPI void * U_EXPORT2
+uplug_getContext(UPlugData *data) {
+  return data->context;
+}
+
+
+U_CAPI void U_EXPORT2
+uplug_setContext(UPlugData *data, void *context) {
+  data->context = context;
+}
+
+U_CAPI const char* U_EXPORT2
+uplug_getConfiguration(UPlugData *data) {
+  return data->config;
+}
+
+U_INTERNAL UPlugData* U_EXPORT2
+uplug_getPlugInternal(int32_t n) { 
+  if(n <0 || n >= pluginCount) {
+    return NULL;
+  } else { 
+    return &(pluginList[n]);
+  }
+}
+
+
+U_CAPI UErrorCode U_EXPORT2
+uplug_getPlugLoadStatus(UPlugData *plug) {
+  return plug->pluginStatus;
+}
+
+
+
+
+/**
+ * Initialize a plugin fron an entrypoint and library - but don't load it.
+ */
+static UPlugData* uplug_initPlugFromEntrypointAndLibrary(UPlugEntrypoint *entrypoint, const char *config, void *lib, const char *sym,
+                                                         UErrorCode *status) {
+  UPlugData *plug = NULL;
+
+  plug = uplug_allocatePlug(entrypoint, config, lib, sym, status);
+
+  if(U_SUCCESS(*status)) {
+    return plug;
+  } else {
+    uplug_deallocatePlug(plug, status);
+    return NULL;
+  }
+}
+
+U_CAPI UPlugData* U_EXPORT2
+uplug_loadPlugFromEntrypoint(UPlugEntrypoint *entrypoint, const char *config, UErrorCode *status) {
+  UPlugData* plug = uplug_initPlugFromEntrypointAndLibrary(entrypoint, config, NULL, NULL, status);
+  uplug_loadPlug(plug, status);
+  return plug;
+}
+
+
+static UPlugData* 
+uplug_initErrorPlug(const char *libName, const char *sym, const char *config, const char *nameOrError, UErrorCode loadStatus, UErrorCode *status)
+{
+  UPlugData *plug = uplug_allocateEmptyPlug(status);
+  if(U_FAILURE(*status)) return NULL;
+
+  plug->pluginStatus = loadStatus;
+  plug->awaitingLoad = FALSE; /* Won't load. */
+  plug->dontUnload = TRUE; /* cannot unload. */
+
+  if(sym!=NULL) {
+    uprv_strncpy(plug->sym, sym, UPLUG_NAME_MAX);
+  }
+
+  if(libName!=NULL) {
+    uprv_strncpy(plug->libName, libName, UPLUG_NAME_MAX);
+  }
+
+  if(nameOrError!=NULL) {
+    uprv_strncpy(plug->name, nameOrError, UPLUG_NAME_MAX);
+  }
+
+  if(config!=NULL) {
+    uprv_strncpy(plug->config, config, UPLUG_NAME_MAX);
+  }
+
+  return plug;
+}
+
+/**
+ * Fetch a plugin from DLL, and then initialize it from a library- but don't load it.
+ */
+
+#if U_ENABLE_DYLOAD
+
+static UPlugData* 
+uplug_initPlugFromLibrary(const char *libName, const char *sym, const char *config, UErrorCode *status) {
+  void *lib = NULL;
+  UPlugData *plug = NULL;
+  if(U_FAILURE(*status)) { return NULL; }
+  lib = uplug_openLibrary(libName, status);
+  if(lib!=NULL && U_SUCCESS(*status)) {
+    UPlugEntrypoint *entrypoint = NULL;
+    /*
+     * ISO forbids the following cast.
+     *  See: http://www.trilithium.com/johan/2004/12/problem-with-dlsym/ 
+     */
+    entrypoint = (UPlugEntrypoint*)uprv_dl_sym(lib, sym, status);
+      
+    if(entrypoint!=NULL&&U_SUCCESS(*status)) {
+      plug = uplug_initPlugFromEntrypointAndLibrary(entrypoint, config, lib, sym, status);
+      if(plug!=NULL&&U_SUCCESS(*status)) {
+        plug->lib = lib; /* plug takes ownership of library */
+        lib = NULL; /* library is now owned by plugin. */
+      }
+    } else {
+      UErrorCode subStatus = U_ZERO_ERROR;
+      plug = uplug_initErrorPlug(libName,sym,config,"ERROR: Could not load entrypoint",(lib==NULL)?U_MISSING_RESOURCE_ERROR:*status,&subStatus);
+    }
+    if(lib!=NULL) { /* still need to close the lib */
+      UErrorCode subStatus = U_ZERO_ERROR;
+      uplug_closeLibrary(lib, &subStatus); /* don't care here */
+    }
+  } else {
+    UErrorCode subStatus = U_ZERO_ERROR;
+    plug = uplug_initErrorPlug(libName,sym,config,"ERROR: could not load library",(lib==NULL)?U_MISSING_RESOURCE_ERROR:*status,&subStatus);
+  }
+  return plug;
+}
+
+U_CAPI UPlugData* U_EXPORT2
+uplug_loadPlugFromLibrary(const char *libName, const char *sym, const char *config, UErrorCode *status) { 
+  UPlugData *plug = NULL;
+  if(U_FAILURE(*status)) { return NULL; }
+  plug = uplug_initPlugFromLibrary(libName, sym, config, status);
+  uplug_loadPlug(plug, status);
+
+  return plug;
+}
+
+#endif
+
+U_CAPI UPlugLevel U_EXPORT2 uplug_getCurrentLevel() {
+  if(cmemory_inUse()) {
+    return UPLUG_LEVEL_HIGH;
+  } else {
+    return UPLUG_LEVEL_LOW;
+  }
+}
+
+static UBool U_CALLCONV uplug_cleanup(void)
+{
+  int32_t i;
+    
+  UPlugData *pluginToRemove;
+  /* cleanup plugs */
+  for(i=0;i<pluginCount;i++) {
+    UErrorCode subStatus = U_ZERO_ERROR;
+    pluginToRemove = &pluginList[i];
+    /* unload and deallocate */
+    uplug_doUnloadPlug(pluginToRemove, &subStatus);
+  }
+  /* close other held libs? */
+  return TRUE;
+}
+
+static void uplug_loadWaitingPlugs(UErrorCode *status) {
+  int32_t i;
+  UPlugLevel currentLevel = uplug_getCurrentLevel();
+    
+  if(U_FAILURE(*status)) {
+    return;
+  }
+#if UPLUG_TRACE
+  DBG((stderr,  "uplug_loadWaitingPlugs() Level: %d\n", currentLevel));
+#endif
+  /* pass #1: low level plugs */
+  for(i=0;i<pluginCount;i++) {
+    UErrorCode subStatus = U_ZERO_ERROR;
+    UPlugData *pluginToLoad = &pluginList[i];
+    if(pluginToLoad->awaitingLoad) {
+      if(pluginToLoad->level == UPLUG_LEVEL_LOW) {
+        if(currentLevel > UPLUG_LEVEL_LOW) {
+          pluginToLoad->pluginStatus = U_PLUGIN_TOO_HIGH;
+        } else {
+          UPlugLevel newLevel;
+          uplug_loadPlug(pluginToLoad, &subStatus);
+          newLevel = uplug_getCurrentLevel();
+          if(newLevel > currentLevel) {
+            pluginToLoad->pluginStatus = U_PLUGIN_CHANGED_LEVEL_WARNING;
+            currentLevel = newLevel;
+          }
+        }
+        pluginToLoad->awaitingLoad = FALSE;
+      } 
+    }
+  }
+  currentLevel = uplug_getCurrentLevel();
+    
+  for(i=0;i<pluginCount;i++) {
+    UErrorCode subStatus = U_ZERO_ERROR;
+    UPlugData *pluginToLoad = &pluginList[i];
+        
+    if(pluginToLoad->awaitingLoad) {
+      if(pluginToLoad->level == UPLUG_LEVEL_INVALID) { 
+        pluginToLoad->pluginStatus = U_PLUGIN_DIDNT_SET_LEVEL;
+      } else if(pluginToLoad->level == UPLUG_LEVEL_UNKNOWN) {
+        pluginToLoad->pluginStatus = U_INTERNAL_PROGRAM_ERROR;
+      } else {
+        uplug_loadPlug(pluginToLoad, &subStatus);
+      }
+      pluginToLoad->awaitingLoad = FALSE;
+    }
+  }
+    
+#if UPLUG_TRACE
+  DBG((stderr,  " Done Loading Plugs. Level: %d\n", (int32_t)uplug_getCurrentLevel()));
+#endif
+}
+
+#if U_ENABLE_DYLOAD
+/* Name of the plugin config file */
+static char plugin_file[2048] = "";
+#endif
+
+U_INTERNAL const char* U_EXPORT2
+uplug_getPluginFile() {
+#if U_ENABLE_DYLOAD
+  return plugin_file;
+#else
+  return NULL;
+#endif
+}
+
+
+U_CAPI void U_EXPORT2
+uplug_init(UErrorCode *status) {
+#if !U_ENABLE_DYLOAD
+  (void)status; /* unused */
+#else
+  const char *plugin_dir;
+
+  if(U_FAILURE(*status)) return;
+  plugin_dir = getenv("ICU_PLUGINS");
+
+#if defined(DEFAULT_ICU_PLUGINS) 
+  if(plugin_dir == NULL || !*plugin_dir) {
+    plugin_dir = DEFAULT_ICU_PLUGINS;
+  }
+#endif
+
+#if UPLUG_TRACE
+  DBG((stderr, "ICU_PLUGINS=%s\n", plugin_dir));
+#endif
+
+  if(plugin_dir != NULL && *plugin_dir) {
+    FILE *f;
+        
+        
+    uprv_strncpy(plugin_file, plugin_dir, 2047);
+    uprv_strncat(plugin_file, U_FILE_SEP_STRING,2047);
+    uprv_strncat(plugin_file, "icuplugins",2047);
+    uprv_strncat(plugin_file, U_ICU_VERSION_SHORT ,2047);
+    uprv_strncat(plugin_file, ".txt" ,2047);
+        
+#if UPLUG_TRACE
+    DBG((stderr, "pluginfile= %s\n", plugin_file));
+#endif
+        
+    f = fopen(plugin_file, "r");
+
+    if(f != NULL) {
+      char linebuf[1024];
+      char *p, *libName=NULL, *symName=NULL, *config=NULL;
+      int32_t line = 0;
+            
+            
+      while(fgets(linebuf,1023,f)) {
+        line++;
+
+        if(!*linebuf || *linebuf=='#') {
+          continue;
+        } else {
+          p = linebuf;
+          while(*p&&isspace(*p))
+            p++;
+          if(!*p || *p=='#') continue;
+          libName = p;
+          while(*p&&!isspace(*p)) {
+            p++;
+          }
+          if(!*p || *p=='#') continue; /* no tab after libname */
+          *p=0; /* end of libname */
+          p++;
+          while(*p&&isspace(*p)) {
+            p++;
+          }
+          if(!*p||*p=='#') continue; /* no symname after libname +tab */
+          symName = p;
+          while(*p&&!isspace(*p)) {
+            p++;
+          }
+                    
+          if(*p) { /* has config */
+            *p=0;
+            ++p;
+            while(*p&&isspace(*p)) {
+              p++;
+            }
+            if(*p) {
+              config = p;
+            }
+          }
+                    
+          /* chop whitespace at the end of the config */
+          if(config!=NULL&&*config!=0) {
+            p = config+strlen(config);
+            while(p>config&&isspace(*(--p))) {
+              *p=0;
+            }
+          }
+                
+          /* OK, we're good. */
+          { 
+            UErrorCode subStatus = U_ZERO_ERROR;
+            UPlugData *plug = uplug_initPlugFromLibrary(libName, symName, config, &subStatus);
+            if(U_FAILURE(subStatus) && U_SUCCESS(*status)) {
+              *status = subStatus;
+            }
+#if UPLUG_TRACE
+            DBG((stderr, "PLUGIN libName=[%s], sym=[%s], config=[%s]\n", libName, symName, config));
+            DBG((stderr, " -> %p, %s\n", (void*)plug, u_errorName(subStatus)));
+#else
+            (void)plug; /* unused */
+#endif
+          }
+        }
+      }
+    } else {
+#if UPLUG_TRACE
+      DBG((stderr, "Can't open plugin file %s\n", plugin_file));
+#endif
+    }
+  }
+  uplug_loadWaitingPlugs(status);
+#endif /* U_ENABLE_DYLOAD */
+  ucln_registerCleanup(UCLN_UPLUG, uplug_cleanup);
+}