X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/4e0b0a957106c8c55b7aa24f118ed5862e98064d..35471ecdf533b2701ca99d3921c42944531883ce:/src/xbt/config.c

diff --git a/src/xbt/config.c b/src/xbt/config.c
index 0b6474bc07..a6c8f6e59a 100644
--- a/src/xbt/config.c
+++ b/src/xbt/config.c
@@ -1,19 +1,18 @@
 /* $Id$ */
 
-/* config - Dictionnary where the type of each cell is provided.            */
+/* config - Dictionnary where the type of each variable is provided.            */
 
 /* This is useful to build named structs, like option or property sets.     */
 
-/* Authors: Martin Quinson                                                  */
-/* Copyright (C) 2001,2002,2003,2004 the OURAGAN project.                   */
+/* Copyright (c) 2001,2002,2003,2004 Martin Quinson. All rights reserved.   */
 
 /* This program is free software; you can redistribute it and/or modify it
-   under the terms of the license (GNU LGPL) which comes with this package. */
+ * under the terms of the license (GNU LGPL) which comes with this package. */
 
 #include "xbt/misc.h"
 #include "xbt/sysdep.h"
 #include "xbt/log.h"
-#include "xbt/error.h"
+#include "xbt/ex.h"
 #include "xbt/dynar.h"
 #include "xbt/dict.h"
 
@@ -21,15 +20,19 @@
 
 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(config,xbt,"configuration support");
 
-/* xbt_cfgelm_t: the typedef corresponding to a config cell. 
+/* xbt_cfgelm_t: the typedef corresponding to a config variable. 
 
    Both data and DTD are mixed, but fixing it now would prevent me to ever
    defend my thesis. */
 
 typedef struct {
-  /* Allowed type of the cell */
+  /* Allowed type of the variable */
   e_xbt_cfgelm_type_t type;
   int min,max;
+  
+  /* Callbacks */
+  xbt_cfg_cb_t cb_set;
+  xbt_cfg_cb_t cb_rm;
 
   /* actual content 
      (cannot be an union because type host uses both str and i) */
@@ -37,36 +40,29 @@ typedef struct {
 } s_xbt_cfgelm_t,*xbt_cfgelm_t;
 
 static const char *xbt_cfgelm_type_name[xbt_cfgelm_type_count]=
-  {"int","double","string","host"};
+  {"int","double","string","host","any"};
 
-/* Internal stuff used in cache to free a cell */
+/* Internal stuff used in cache to free a variable */
 static void xbt_cfgelm_free(void *data);
 
-/* Retrieve the cell we'll modify */
-static xbt_error_t xbt_cfgelm_get(xbt_cfg_t cfg, const char *name,
-				    e_xbt_cfgelm_type_t type,
-				    /* OUT */ xbt_cfgelm_t *whereto);
-
-void xbt_cfg_str_free(void *d);
-void xbt_cfg_host_free(void *d);
+/* Retrieve the variable we'll modify */
+static xbt_cfgelm_t xbt_cfgelm_get(xbt_cfg_t cfg, const char *name,
+				   e_xbt_cfgelm_type_t type);
 
-void xbt_cfg_str_free(void *d){
-  xbt_free(*(void**)d);
+static void xbt_cfg_str_free(void *d){
+  free(*(void**)d);
 }
-void xbt_cfg_host_free(void *d){
+static void xbt_cfg_host_free(void *d){
   xbt_host_t *h=(xbt_host_t*) *(void**)d; 
   if (h) {
-    if (h->name) xbt_free(h->name);
-    xbt_free(h);
+    if (h->name) free(h->name);
+    free(h);
   }
 }
 
 /*----[ Memory management ]-----------------------------------------------*/
 
-/**
- * xbt_cfg_new:
- *
- * @whereto: 
+/** @brief Constructor
  *
  * Initialise an config set
  */
@@ -76,45 +72,44 @@ xbt_cfg_t xbt_cfg_new(void) {
   return (xbt_cfg_t)xbt_dict_new();
 }
 
-/**
- * xbt_cfg_cpy:
+/** \brief Copy an existing configuration set
  *
- * @whereto: the config set to be created
- * @tocopy: the source data
+ * \arg whereto the config set to be created
+ * \arg tocopy the source data
  *
+ * This only copy the registrations, not the actual content
  */
 
 void
 xbt_cfg_cpy(xbt_cfg_t tocopy,xbt_cfg_t *whereto) {
   xbt_dict_cursor_t cursor=NULL; 
-  xbt_cfgelm_t cell=NULL;
+  xbt_cfgelm_t variable=NULL;
   char *name=NULL;
   
   *whereto=NULL;
   xbt_assert0(tocopy,"cannot copy NULL config");
 
-  xbt_dict_foreach((xbt_dict_t)tocopy,cursor,name,cell) {
-    xbt_cfg_register(*whereto, name, cell->type, cell->min, cell->max);
+  xbt_dict_foreach((xbt_dict_t)tocopy,cursor,name,variable) {
+    xbt_cfg_register(*whereto, name, variable->type, variable->min, variable->max,
+                     variable->cb_set, variable->cb_rm);
   }
 }
 
+/** @brief Destructor */
 void xbt_cfg_free(xbt_cfg_t *cfg) {
   xbt_dict_free((xbt_dict_t*)cfg);
 }
 
-/**
- * xbt_cfg_dump:
- * @name: The name to give to this config set
- * @indent: what to write at the begining of each line (right number of spaces)
- * @cfg: the config set
+/** @brief Dump a config set for debuging purpose
  *
- * Dumps a config set for debuging purpose
+ * \arg name The name to give to this config set
+ * \arg indent what to write at the begining of each line (right number of spaces)
+ * \arg cfg the config set
  */
-void
-xbt_cfg_dump(const char *name,const char *indent,xbt_cfg_t cfg) {
+void xbt_cfg_dump(const char *name,const char *indent,xbt_cfg_t cfg) {
   xbt_dict_t dict = (xbt_dict_t) cfg;
   xbt_dict_cursor_t cursor=NULL; 
-  xbt_cfgelm_t cell=NULL;
+  xbt_cfgelm_t variable=NULL;
   char *key=NULL;
   int i; 
   int size;
@@ -125,41 +120,42 @@ xbt_cfg_dump(const char *name,const char *indent,xbt_cfg_t cfg) {
 
   if (name)
     printf("%s>> Dumping of the config set '%s':\n",indent,name);
-  xbt_dict_foreach(dict,cursor,key,cell) {
+  xbt_dict_foreach(dict,cursor,key,variable) {
 
     printf("%s  %s:",indent,key);
 
-    size = xbt_dynar_length(cell->content);
-    printf("%d_to_%d_%s. Actual size=%d. List of values:\n",
-	   cell->min,cell->max,xbt_cfgelm_type_name[cell->type],
-	   size);
+    size = xbt_dynar_length(variable->content);
+    printf("%d_to_%d_%s. Actual size=%d. prerm=%p,postset=%p, List of values:\n",
+	   variable->min,variable->max,xbt_cfgelm_type_name[variable->type],
+	   size,
+           variable->cb_rm, variable->cb_set);
 
-    switch (cell->type) {
+    switch (variable->type) {
        
     case xbt_cfgelm_int:
       for (i=0; i<size; i++) {
-	ival = xbt_dynar_get_as(cell->content,i,int);
+	ival = xbt_dynar_get_as(variable->content,i,int);
 	printf ("%s    %d\n",indent,ival);
       }
       break;
 
     case xbt_cfgelm_double:
       for (i=0; i<size; i++) {
-	dval = xbt_dynar_get_as(cell->content,i,double);
+	dval = xbt_dynar_get_as(variable->content,i,double);
 	printf ("%s    %f\n",indent,dval);
       }
       break;
 
     case xbt_cfgelm_string:
       for (i=0; i<size; i++) {
-	sval = xbt_dynar_get_as(cell->content,i,char*);
+	sval = xbt_dynar_get_as(variable->content,i,char*);
 	printf ("%s    %s\n",indent,sval);
       }
       break;
 
     case xbt_cfgelm_host:
       for (i=0; i<size; i++) {
-	hval = xbt_dynar_get_as(cell->content,i,xbt_host_t*);
+	hval = xbt_dynar_get_as(variable->content,i,xbt_host_t*);
 	printf ("%s    %s:%d\n",indent,hval->name,hval->port);
       }
       break;
@@ -177,11 +173,7 @@ xbt_cfg_dump(const char *name,const char *indent,xbt_cfg_t cfg) {
   return;
 }
 
-/**
- * xbt_cfgelm_free:
- *
- * @data: the data to be freed (typed as void* to be usable as free funct in dict)
- *
+/*
  * free an config element
  */
 
@@ -190,42 +182,57 @@ void xbt_cfgelm_free(void *data) {
 
   if (!c) return;
   xbt_dynar_free(&(c->content));
-  xbt_free(c);
+  free(c);
 }
 
 /*----[ Registering stuff ]-----------------------------------------------*/
 
-/**
- * xbt_cfg_register:
- * @cfg: the config set
- * @type: the type of the config element
- * @min: the minimum
- * @max: the maximum
+/** @brief Register an element within a config set
  *
- * register an element within a config set
+ *  @arg cfg the config set
+ *  @arg type the type of the config element
+ *  @arg min the minimum
+ *  @arg max the maximum
  */
 
 void
 xbt_cfg_register(xbt_cfg_t cfg,
-		  const char *name, e_xbt_cfgelm_type_t type,
-		  int min, int max){
+		 const char *name, e_xbt_cfgelm_type_t type,
+		 int min, int max,
+		 xbt_cfg_cb_t cb_set,  xbt_cfg_cb_t cb_rm){
   xbt_cfgelm_t res;
-  xbt_error_t errcode;
-
-  DEBUG4("Register cfg elm %s (%d to %d %s)",name,min,max,xbt_cfgelm_type_name[type]);
-  errcode = xbt_dict_get((xbt_dict_t)cfg,name,(void**)&res);
+  xbt_ex_t e;
+  int found=0;
+
+  xbt_assert(cfg);
+  xbt_assert4(type>=xbt_cfgelm_int && type<=xbt_cfgelm_host,
+              "type of %s not valid (%d should be between %d and %d)",
+              name,type,xbt_cfgelm_int, xbt_cfgelm_host);
+  DEBUG5("Register cfg elm %s (%d to %d %s (=%d))",
+	 name,min,max,xbt_cfgelm_type_name[type],type);
+  TRY {
+    res = xbt_dict_get((xbt_dict_t)cfg,name);
+  } CATCH(e) {
+    if (e.category == not_found_error) {
+      found = 1;
+      xbt_ex_free(e);
+    } else {
+      RETHROW;
+    }
+  }
 
-  if (errcode == no_error) {
+  if (!found) {
     WARN1("Config elem %s registered twice.",name);
     /* Will be removed by the insertion of the new one */
   } 
-  xbt_assert_error(mismatch_error);
 
   res=xbt_new(s_xbt_cfgelm_t,1);
 
   res->type=type;
   res->min=min;
   res->max=max;
+  res->cb_set = cb_set;
+  res->cb_rm  = cb_rm;
 
   switch (type) {
   case xbt_cfgelm_int:
@@ -251,31 +258,32 @@ xbt_cfg_register(xbt_cfg_t cfg,
   xbt_dict_set((xbt_dict_t)cfg,name,res,&xbt_cfgelm_free);
 }
 
-/**
- * xbt_cfg_unregister:
+/** @brief Unregister an element from a config set. 
  * 
- * @cfg: the config set
- * @name: the name of the elem to be freed
+ *  @arg cfg the config set
+ *  @arg name the name of the elem to be freed
  * 
- * unregister an element from a config set. 
- * Note that it removes both the DTD and the actual content.
+ *  Note that it removes both the description and the actual content.
+ *  Throws not_found when no such element exists.
  */
 
-xbt_error_t
+void
 xbt_cfg_unregister(xbt_cfg_t cfg,const char *name) {
-  return xbt_dict_remove((xbt_dict_t)cfg,name);
+  xbt_dict_remove((xbt_dict_t)cfg,name);
 }
 
 /**
- * xbt_cfg_register_str:
+ * @brief Parse a string and register the stuff described.
  *
- * @cfg: the config set
- * @entry: a string describing the element to register
+ * @arg cfg the config set
+ * @arg entry a string describing the element to register
  *
- * Parse a string and register the stuff described.
+ * The string may consist in several variable descriptions separated by a space. 
+ * Each of them must use the following syntax: \<name\>:\<min nb\>_to_\<max nb\>_\<type\>
+ * with type being one of  'string','int', 'host' or 'double'.
  */
 
-xbt_error_t
+void
 xbt_cfg_register_str(xbt_cfg_t cfg,const char *entry) {
   char *entrycpy=xbt_strdup(entry);
   char *tok;
@@ -284,263 +292,231 @@ xbt_cfg_register_str(xbt_cfg_t cfg,const char *entry) {
   e_xbt_cfgelm_type_t type;
 
   tok=strchr(entrycpy, ':');
-  if (!tok) {
-    ERROR3("%s%s%s",
-	  "Invalid config element descriptor: ",entry,
-	  "; Should be <name>:<min nb>_to_<max nb>_<type>");
-    xbt_free(entrycpy);
-    xbt_abort();
-  }
+  xbt_assert2(tok,"Invalid config element descriptor: %s%s",
+	      entry,
+	      "; Should be <name>:<min nb>_to_<max nb>_<type>");
   *(tok++)='\0';
 
   min=strtol(tok, &tok, 10);
-  if (!tok) {
-    ERROR1("Invalid minimum in config element descriptor %s",entry);
-    xbt_free(entrycpy);
-    xbt_abort();
-  }
+  xbt_assert1(tok,"Invalid minimum in config element descriptor %s",entry);
 
-  if (!strcmp(tok,"_to_")){
-    ERROR3("%s%s%s",
-	  "Invalid config element descriptor: ",entry,
-	  "; Should be <name>:<min nb>_to_<max nb>_<type>");
-    xbt_free(entrycpy);
-    xbt_abort();
-  }
+  xbt_assert2(strcmp(tok,"_to_"),
+	      "Invalid config element descriptor : %s%s",	    
+	      entry,
+	      "; Should be <name>:<min nb>_to_<max nb>_<type>");
   tok += strlen("_to_");
 
   max=strtol(tok, &tok, 10);
-  if (!tok) {
-    ERROR1("Invalid maximum in config element descriptor %s",entry);
-    xbt_free(entrycpy);
-    xbt_abort();
-  }
+  xbt_assert1(tok,"Invalid maximum in config element descriptor %s",entry);
 
-  if (*(tok++)!='_') {
-    ERROR3("%s%s%s",
-	  "Invalid config element descriptor: ",entry,
-	  "; Should be <name>:<min nb>_to_<max nb>_<type>");
-    xbt_free(entrycpy);
-    xbt_abort();
-  }
+  xbt_assert2( *(tok++) =='_',
+	       "Invalid config element descriptor: %s%s",entry,
+	       "; Should be <name>:<min nb>_to_<max nb>_<type>");
 
   for (type=0; 
        type<xbt_cfgelm_type_count && strcmp(tok,xbt_cfgelm_type_name[type]); 
        type++);
-  if (type == xbt_cfgelm_type_count) {
-    ERROR3("%s%s%s",
-	  "Invalid type in config element descriptor: ",entry,
+  xbt_assert2(type < xbt_cfgelm_type_count,
+	  "Invalid type in config element descriptor: %s%s",entry,
 	  "; Should be one of 'string', 'int', 'host' or 'double'.");
-    xbt_free(entrycpy);
-    xbt_abort();
-  }
 
-  xbt_cfg_register(cfg,entrycpy,type,min,max);
+  xbt_cfg_register(cfg,entrycpy,type,min,max,NULL,NULL);
 
-  xbt_free(entrycpy); /* strdup'ed by dict mechanism, but cannot be const */
-  return no_error;
+  free(entrycpy); /* strdup'ed by dict mechanism, but cannot be const */
 }
 
-/**
- * xbt_cfg_check:
- *
- * @cfg: the config set
- * 
- * Check the config set
- */
+/** @brief Check that each variable have the right amount of values */
 
-xbt_error_t
+void
 xbt_cfg_check(xbt_cfg_t cfg) {
   xbt_dict_cursor_t cursor; 
-  xbt_cfgelm_t cell;
+  xbt_cfgelm_t variable;
   char *name;
   int size;
 
   xbt_assert0(cfg,"NULL config set.");
 
-  xbt_dict_foreach((xbt_dict_t)cfg,cursor,name,cell) {
-    size = xbt_dynar_length(cell->content);
-    if (cell->min > size) { 
-      ERROR4("Config elem %s needs at least %d %s, but there is only %d values.",
+  xbt_dict_foreach((xbt_dict_t)cfg,cursor,name,variable) {
+    size = xbt_dynar_length(variable->content);
+    if (variable->min > size) { 
+      xbt_dict_cursor_free(&cursor);
+      THROW4(mismatch_error,0,
+	     "Config elem %s needs at least %d %s, but there is only %d values.",
 	     name,
-	     cell->min,
-	     xbt_cfgelm_type_name[cell->type],
+	     variable->min,
+	     xbt_cfgelm_type_name[variable->type],
 	     size); 
-      xbt_dict_cursor_free(&cursor);
-      return mismatch_error;
     }
 
-    if (cell->max < size) {
-      ERROR4("Config elem %s accepts at most %d %s, but there is %d values.",
+    if (variable->max > 0 && variable->max < size) {
+      xbt_dict_cursor_free(&cursor);
+      THROW4(mismatch_error,0,
+	     "Config elem %s accepts at most %d %s, but there is %d values.",
 	     name,
-	     cell->max,
-	     xbt_cfgelm_type_name[cell->type],
+	     variable->max,
+	     xbt_cfgelm_type_name[variable->type],
 	     size);
-      xbt_dict_cursor_free(&cursor);
-      return mismatch_error;
     }
-
   }
 
   xbt_dict_cursor_free(&cursor);
-  return no_error;
 }
 
-static xbt_error_t xbt_cfgelm_get(xbt_cfg_t  cfg,
-				    const char *name,
-				    e_xbt_cfgelm_type_t type,
-				    /* OUT */ xbt_cfgelm_t *whereto){
-   
-  xbt_error_t errcode = xbt_dict_get((xbt_dict_t)cfg,name,
-				       (void**)whereto);
-
-  if (errcode == mismatch_error) {
-    ERROR1("No registered cell %s in this config set",
-	   name);
-    return mismatch_error;
+static xbt_cfgelm_t xbt_cfgelm_get(xbt_cfg_t  cfg,
+				   const char *name,
+				   e_xbt_cfgelm_type_t type){
+  xbt_cfgelm_t res=NULL;
+  xbt_ex_t e;
+
+  TRY {
+    res = xbt_dict_get((xbt_dict_t)cfg,name);
+  } CATCH(e) {
+    if (e.category == not_found_error) {
+      xbt_ex_free(e);
+      THROW1(not_found_error,0,
+	     "No registered variable '%s' in this config set",name);
+    }
+    RETHROW;
   }
-  if (errcode != no_error)
-     return errcode;
 
-  xbt_assert3((*whereto)->type == type,
+  xbt_assert3(type == xbt_cfgelm_any || res->type == type,
 	       "You tried to access to the config element %s as an %s, but its type is %s.",
 	       name,
 	       xbt_cfgelm_type_name[type],
-	       xbt_cfgelm_type_name[(*whereto)->type]);
+	       xbt_cfgelm_type_name[res->type]);
 
-  return no_error;
+  return res;
 }
 
-/**
- * xbt_cfg_get_type:
+/** @brief Get the type of this variable in that configuration set
  *
- * @cfg: the config set
- * @name: the name of the element 
- * @type: the result
+ * \arg cfg the config set
+ * \arg name the name of the element 
+ * \arg type the result
  *
- * Give the type of the config element
  */
 
-xbt_error_t
-xbt_cfg_get_type(xbt_cfg_t cfg, const char *name, 
-		      /* OUT */e_xbt_cfgelm_type_t *type) {
-
-  xbt_cfgelm_t cell;
-  xbt_error_t errcode;
+e_xbt_cfgelm_type_t 
+xbt_cfg_get_type(xbt_cfg_t cfg, const char *name) {
 
-  TRYCATCH(mismatch_error,xbt_dict_get((xbt_dict_t)cfg,name,(void**)&cell));
+  xbt_cfgelm_t variable = NULL;
+  xbt_ex_t e;
 
-  if (errcode == mismatch_error) {
-    ERROR1("Can't get the type of '%s' since this cell does not exist",
-	   name);
-    return mismatch_error;
+  TRY {
+    variable = xbt_dict_get((xbt_dict_t)cfg,name);
+  } CATCH(e) {
+    if (e.category == not_found_error) { 
+      xbt_ex_free(e);
+      THROW1(not_found_error,0,
+	     "Can't get the type of '%s' since this variable does not exist",name);
+    }
+    RETHROW;
   }
 
-  *type=cell->type;
+  INFO1("type in variable = %d",variable->type);
 
-  return no_error;
+  return variable->type;
 }
 
 /*----[ Setting ]---------------------------------------------------------*/
-/** 
- * xbt_cfg_set_vargs(): 
- * @cfg: config set to fill
- * @varargs: NULL-terminated list of pairs {(const char*)key, value}
+/**  @brief va_args version of xbt_cfg_set
+ *
+ * \arg cfg config set to fill
+ * \arg n   variable name
+ * \arg pa  variable value
  *
  * Add some values to the config set.
- * @warning: if the list isn't NULL terminated, it will segfault. 
  */
-xbt_error_t
-xbt_cfg_set_vargs(xbt_cfg_t cfg, va_list pa) {
-  char *str,*name;
+void
+xbt_cfg_set_vargs(xbt_cfg_t cfg, const char *name, va_list pa) {
+  char *str;
   int i;
   double d;
-  e_xbt_cfgelm_type_t type;
+  e_xbt_cfgelm_type_t type=0; /* Set a dummy value to make gcc happy. It cannot get uninitialized */
 
-  xbt_error_t errcode;
+  xbt_ex_t e;
   
-  while ((name=va_arg(pa,char *))) {
-
-    if (!xbt_cfg_get_type(cfg,name,&type)) {
-      ERROR1("Can't set the property '%s' since it's not registered",name);
-      return mismatch_error;
+  TRY {
+    type = xbt_cfg_get_type(cfg,name);
+  } CATCH(e) {
+    if (e.category == not_found_error) {
+      xbt_ex_free(e);
+      THROW1(not_found_error,0,"Can't set the property '%s' since it's not registered",name);
     }
+    RETHROW;
+  }
 
-    switch (type) {
-    case xbt_cfgelm_host:
-      str = va_arg(pa, char *);
-      i=va_arg(pa,int);
-      TRY(xbt_cfg_set_host(cfg,name,str,i));
-      break;
+  switch (type) {
+  case xbt_cfgelm_host:
+    str = va_arg(pa, char *);
+    i=va_arg(pa,int);
+    xbt_cfg_set_host(cfg,name,str,i);
+    break;
       
-    case xbt_cfgelm_string:
-      str=va_arg(pa, char *);
-      TRY(xbt_cfg_set_string(cfg, name, str));
-      break;
+  case xbt_cfgelm_string:
+    str=va_arg(pa, char *);
+    xbt_cfg_set_string(cfg, name, str);
+    break;
 
-    case xbt_cfgelm_int:
-      i=va_arg(pa,int);
-      TRY(xbt_cfg_set_int(cfg,name,i));
-      break;
+  case xbt_cfgelm_int:
+    i=va_arg(pa,int);
+    xbt_cfg_set_int(cfg,name,i);
+    break;
 
-    case xbt_cfgelm_double:
-      d=va_arg(pa,double);
-      TRY(xbt_cfg_set_double(cfg,name,d));
-      break;
+  case xbt_cfgelm_double:
+    d=va_arg(pa,double);
+    xbt_cfg_set_double(cfg,name,d);
+    break;
 
-    default: 
-      RAISE1(unknown_error,"Config element cell %s not valid.",name);
-    }
+  default:
+    xbt_assert2(0,"Config element variable %s not valid (type=%d)",name,type);
   }
-  return no_error;
 }
 
-/** 
- * xbt_cfg_set():
- * @cfg: config set to fill
- * @varargs: NULL-terminated list of pairs {(const char*)key, value}
+/** @brief Add a NULL-terminated list of pairs {(char*)key, value} to the set
+ *
+ * \arg cfg config set to fill
+ * \arg name variable name
+ * \arg varargs variable value
  *
- * Add some values to the config set.
- * @warning: if the list isn't NULL terminated, it will segfault. 
  */
-xbt_error_t xbt_cfg_set(xbt_cfg_t cfg, ...) {
+void xbt_cfg_set(xbt_cfg_t cfg, const char *name, ...) {
   va_list pa;
-  xbt_error_t errcode;
 
-  va_start(pa,cfg);
-  errcode=xbt_cfg_set_vargs(cfg,pa);
+  va_start(pa,name);
+  xbt_cfg_set_vargs(cfg,name,pa);
   va_end(pa);
-  return errcode;
 }
 
-/**
- * xbt_cfg_set_parse():
- * @cfg: config set to fill
- * @options: a string containing the content to add to the config set. This
- * is a '\t',' ' or '\n' separated list of cells. Each individual cell is
+/** @brief Add values parsed from a string into a config set
+ *
+ * \arg cfg config set to fill
+ * \arg options a string containing the content to add to the config set. This
+ * is a '\\t',' ' or '\\n' separated list of variables. Each individual variable is
  * like "[name]:[value]" where [name] is the name of an already registred 
- * cell, and [value] conforms to the data type under which this cell was
+ * variable, and [value] conforms to the data type under which this variable was
  * registred.
  *
- * Add the cells described in a string to a config set.
+ * @todo This is a crude manual parser, it should be a proper lexer.
  */
 
-xbt_error_t
+void
 xbt_cfg_set_parse(xbt_cfg_t cfg, const char *options) {
+  xbt_ex_t e;
+
   int i;
   double d;
   char *str;
 
-  xbt_cfgelm_t cell;
+  xbt_cfgelm_t variable=NULL;
   char *optionlist_cpy;
   char *option,  *name,*val;
 
   int len;
-  xbt_error_t errcode;
 
   XBT_IN;
   if (!options || !strlen(options)) { /* nothing to do */
-    return no_error;
+    return;
   }
   optionlist_cpy=xbt_strdup(options);
 
@@ -557,19 +533,21 @@ xbt_cfg_set_parse(xbt_cfg_t cfg, const char *options) {
 
     /* Pass the value */
     while (option-name<=(len-1) && *option != ' ' && *option != '\n' && *option != '\t') {
-      /*fprintf(stderr,"Take %c.\n",*option);*/
+      DEBUG1("Take %c.",*option);
       option++;
     }
     if (option-name == len) {
-      /*fprintf(stderr,"Boundary=EOL\n");*/
+      DEBUG0("Boundary=EOL");
       option=NULL; /* don't do next iteration */
 
     } else {
-      /*fprintf(stderr,"Boundary on '%c'. len=%d;option-name=%d\n",*option,len,option-name);*/
+      DEBUG3("Boundary on '%c'. len=%d;option-name=%d",
+	     *option,len,option-name);
 
       /* Pass the following blank chars */
       *(option++)='\0';
-      while (option-name<(len-1) && (*option == ' ' || *option == '\n' || *option == '\t')) {
+      while (option-name<(len-1) && 
+	     (*option == ' ' || *option == '\n' || *option == '\t')) {
 	/*      fprintf(stderr,"Ignore a blank char.\n");*/
 	option++;
       }
@@ -585,188 +563,203 @@ xbt_cfg_set_parse(xbt_cfg_t cfg, const char *options) {
     
     val=strchr(name,':');
     if (!val) {
-      xbt_free(optionlist_cpy);
+      free(optionlist_cpy);
       xbt_assert1(FALSE,
-		   "Malformated option: '%s'; Should be of the form 'name:value'",
-		   name);
+	     "Malformated option: '%s'; Should be of the form 'name:value'",
+		  name);
     }
     *(val++)='\0';
 
     DEBUG2("name='%s';val='%s'",name,val);
 
-    errcode=xbt_dict_get((xbt_dict_t)cfg,name,(void**)&cell);
-    switch (errcode) {
-    case no_error:
-      break;
-    case mismatch_error:
-      ERROR1("No registrated cell corresponding to '%s'.",name);
-      xbt_free(optionlist_cpy);
-      return mismatch_error;
-      break;
-    default:
-      xbt_free(optionlist_cpy);
-      return errcode;
-    }
-
-    switch (cell->type) {
-    case xbt_cfgelm_string:
-      TRYCLEAN(xbt_cfg_set_string(cfg, name, val),
-	       xbt_free(optionlist_cpy));
-      break;
-
-    case xbt_cfgelm_int:
-      i=strtol(val, &val, 0);
-      if (val==NULL) {
-	xbt_free(optionlist_cpy);	
-	xbt_assert1(FALSE,
-		     "Value of option %s not valid. Should be an integer",
-		     name);
-      }
-
-      TRYCLEAN(xbt_cfg_set_int(cfg,name,i),
-	       xbt_free(optionlist_cpy));
-      break;
-
-    case xbt_cfgelm_double:
-      d=strtod(val, &val);
-      if (val==NULL) {
-	xbt_free(optionlist_cpy);	
-	xbt_assert1(FALSE,
-	       "Value of option %s not valid. Should be a double",
-	       name);
-      }
-
-      TRYCLEAN(xbt_cfg_set_double(cfg,name,d),
-	       xbt_free(optionlist_cpy));
-      break;
-
-    case xbt_cfgelm_host:
-      str=val;
-      val=strchr(val,':');
-      if (!val) {
-	xbt_free(optionlist_cpy);	
-	xbt_assert1(FALSE,
-	       "Value of option %s not valid. Should be an host (machine:port)",
-	       name);
+    TRY {
+      variable = xbt_dict_get((xbt_dict_t)cfg,name);
+    } CATCH(e) {
+      /* put it back on what won't get freed, ie within "options" and out of "optionlist_cpy" */
+      name = (char*) (optionlist_cpy-name + options); 
+      free(optionlist_cpy);
+      if (e.category == not_found_error) {
+	xbt_ex_free(e);
+	THROW1(not_found_error,0,"No registrated variable corresponding to '%s'.",name);
       }
+      RETHROW;
+    }
 
-      *(val++)='\0';
-      i=strtol(val, &val, 0);
-      if (val==NULL) {
-	xbt_free(optionlist_cpy);	
-	xbt_assert1(FALSE,
-	       "Value of option %s not valid. Should be an host (machine:port)",
-	       name);
+    TRY {
+      switch (variable->type) {
+      case xbt_cfgelm_string:
+	xbt_cfg_set_string(cfg, name, val); /* throws */
+	break;
+
+      case xbt_cfgelm_int:
+	i=strtol(val, &val, 0);
+	if (val==NULL) {
+	  free(optionlist_cpy);	
+	  xbt_assert1(FALSE,
+		      "Value of option %s not valid. Should be an integer",
+		      name);
+	}
+
+	xbt_cfg_set_int(cfg,name,i); /* throws */
+	break;
+
+      case xbt_cfgelm_double:
+	d=strtod(val, &val);
+	if (val==NULL) {
+	  free(optionlist_cpy);	
+	  xbt_assert1(FALSE,
+		      "Value of option %s not valid. Should be a double",
+		      name);
+	}
+
+	xbt_cfg_set_double(cfg,name,d); /* throws */
+	break;
+
+      case xbt_cfgelm_host:
+	str=val;
+	val=strchr(val,':');
+	if (!val) {
+	  free(optionlist_cpy);	
+	  xbt_assert1(FALSE,
+		      "Value of option %s not valid. Should be an host (machine:port)",
+		      name);
+	}
+	
+	*(val++)='\0';
+	i=strtol(val, &val, 0);
+	if (val==NULL) {
+	  free(optionlist_cpy);	
+	  xbt_assert1(FALSE,
+		      "Value of option %s not valid. Should be an host (machine:port)",
+		      name);
+	}
+
+	xbt_cfg_set_host(cfg,name,str,i); /* throws */ 
+	break;      
+
+      default: 
+	THROW1(unknown_error,0,"Type of config element %s is not valid.",name);
       }
-
-      TRYCLEAN(xbt_cfg_set_host(cfg,name,str,i),
-	       xbt_free(optionlist_cpy));
-      break;      
-
-    default: 
-      xbt_free(optionlist_cpy);
-      RAISE1(unknown_error,"Type of config element %s is not valid.",name);
+    } CATCH(e) {
+      free(optionlist_cpy);
+      RETHROW;
     }
-    
   }
-  xbt_free(optionlist_cpy);
-  return no_error;
+  free(optionlist_cpy);
+
 }
 
-/**
- * xbt_cfg_set_int:
- *
- * @cfg: the config set
- * @name: the name of the cell
- * @val: the value of the cell
+/** @brief Set or add an integer value to \a name within \a cfg
  *
- * Set the value of the cell @name in @cfg with the provided value.
+ * \arg cfg the config set
+ * \arg name the name of the variable
+ * \arg val the value of the variable
  */ 
-xbt_error_t
+void
 xbt_cfg_set_int(xbt_cfg_t cfg,const char*name, int val) {
-  xbt_cfgelm_t cell;
-  xbt_error_t errcode;
+  xbt_cfgelm_t variable;
 
   VERB2("Configuration setting: %s=%d",name,val);
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_int,&cell));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_int);
 
-  if (cell->max > 1) {
-    xbt_dynar_push(cell->content,&val);
+  if (variable->max == 1) {
+    if (variable->cb_rm && xbt_dynar_length(variable->content))
+      (*variable->cb_rm)(name, 0);
+          
+    xbt_dynar_set(variable->content,0,&val);
   } else {
-    xbt_dynar_set(cell->content,0,&val);
+    if (variable->max && xbt_dynar_length(variable->content) == variable->max)
+      THROW3(mismatch_error,0,
+             "Cannot add value %d to the config element %s since it's already full (size=%d)",
+             val,name,variable->max); 
+             
+    xbt_dynar_push(variable->content,&val);
   }
-  return no_error;
+
+  if (variable->cb_set)
+    (*variable->cb_set)(name, xbt_dynar_length(variable->content) -1);
 }
 
-/**
- * xbt_cfg_set_double:
- * @cfg: the config set
- * @name: the name of the cell
- * @val: the doule to set
+/** @brief Set or add a double value to \a name within \a cfg
  * 
- * Set the value of the cell @name in @cfg with the provided value.
+ * \arg cfg the config set
+ * \arg name the name of the variable
+ * \arg val the doule to set
  */ 
 
-xbt_error_t
+void
 xbt_cfg_set_double(xbt_cfg_t cfg,const char*name, double val) {
-  xbt_cfgelm_t cell;
-  xbt_error_t errcode;
+  xbt_cfgelm_t variable;
 
   VERB2("Configuration setting: %s=%f",name,val);
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_double,&cell));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_double);
 
-  if (cell->max > 1) {
-    xbt_dynar_push(cell->content,&val);
+  if (variable->max == 1) {
+    if (variable->cb_rm && xbt_dynar_length(variable->content))
+      (*variable->cb_rm)(name, 0);
+          
+    xbt_dynar_set(variable->content,0,&val);
   } else {
-    xbt_dynar_set(cell->content,0,&val);
+    if (variable->max && xbt_dynar_length(variable->content) == variable->max)
+      THROW3(mismatch_error,0,
+             "Cannot add value %f to the config element %s since it's already full (size=%d)",
+             val,name,variable->max); 
+             
+    xbt_dynar_push(variable->content,&val);
   }
-  return no_error;
+
+  if (variable->cb_set)
+    (*variable->cb_set)(name, xbt_dynar_length(variable->content) -1);
 }
 
-/**
- * xbt_cfg_set_string:
+/** @brief Set or add a string value to \a name within \a cfg
  * 
- * @cfg: the config set
- * @name: the name of the cell
- * @val: the value to be added
+ * \arg cfg the config set
+ * \arg name the name of the variable
+ * \arg val the value to be added
  *
- * Set the value of the cell @name in @cfg with the provided value.
  */ 
 
-xbt_error_t
+void
 xbt_cfg_set_string(xbt_cfg_t cfg,const char*name, const char*val) { 
-  xbt_cfgelm_t cell;
-  xbt_error_t errcode;
+  xbt_cfgelm_t variable;
   char *newval = xbt_strdup(val);
 
   VERB2("Configuration setting: %s=%s",name,val);
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_string,&cell));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_string);
 
-  if (cell->max > 1) {
-    xbt_dynar_push(cell->content,&newval);
+  if (variable->max == 1) {
+    if (variable->cb_rm && xbt_dynar_length(variable->content))
+      (*variable->cb_rm)(name, 0);
+          
+    xbt_dynar_set(variable->content,0,&newval);
   } else {
-    xbt_dynar_set(cell->content,0,&newval);
+    if (variable->max && xbt_dynar_length(variable->content) == variable->max)
+      THROW3(mismatch_error,0,
+             "Cannot add value %s to the config element %s since it's already full (size=%d)",
+             name,val,variable->max); 
+             
+    xbt_dynar_push(variable->content,&newval);
   }
-  return no_error;
+
+  if (variable->cb_set)
+    (*variable->cb_set)(name, xbt_dynar_length(variable->content) -1);
 }
 
-/**
- * xbt_cfg_set_host:
+/** @brief Set or add an host value to \a name within \a cfg
  * 
- * @cfg: the config set
- * @name: the name of the cell
- * @host: the host
- * @port: the port number
+ * \arg cfg the config set
+ * \arg name the name of the variable
+ * \arg host the host
+ * \arg port the port number
  *
- * Set the value of the cell @name in @cfg with the provided value 
- * on the given @host to the given @port
+ * \e host values are composed of a string (hostname) and an integer (port)
  */ 
 
-xbt_error_t 
+void
 xbt_cfg_set_host(xbt_cfg_t cfg,const char*name, 
 		  const char *host,int port) {
-  xbt_cfgelm_t cell;
-  xbt_error_t errcode;
+  xbt_cfgelm_t variable;
   xbt_host_t *val=xbt_new(xbt_host_t,1);
 
   VERB3("Configuration setting: %s=%s:%d",name,host,port);
@@ -774,329 +767,375 @@ xbt_cfg_set_host(xbt_cfg_t cfg,const char*name,
   val->name = xbt_strdup(name);
   val->port = port;
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_host,&cell));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_host);
 
-  if (cell->max > 1) {
-    xbt_dynar_push(cell->content,&val);
+  if (variable->max == 1) {
+    if (variable->cb_rm && xbt_dynar_length(variable->content))
+      (*variable->cb_rm)(name, 0);
+          
+    xbt_dynar_set(variable->content,0,&val);
   } else {
-    xbt_dynar_set(cell->content,0,&val);
+    if (variable->max && xbt_dynar_length(variable->content) == variable->max)
+      THROW4(mismatch_error,0,
+             "Cannot add value %s:%d to the config element %s since it's already full (size=%d)",
+             host,port,name,variable->max); 
+             
+    xbt_dynar_push(variable->content,&val);
   }
-  return no_error;
+
+  if (variable->cb_set)
+    (*variable->cb_set)(name, xbt_dynar_length(variable->content) -1);
 }
 
 /* ---- [ Removing ] ---- */
 
-/**
- * xbt_cfg_rm_int:
- *
- * @cfg: the config set
- * @name: the name of the cell
- * @val: the value to be removed
+/** @brief Remove the provided \e val integer value from a variable
  *
- * Remove the provided @val from the cell @name in @cfg.
+ * \arg cfg the config set
+ * \arg name the name of the variable
+ * \arg val the value to be removed
  */
-xbt_error_t xbt_cfg_rm_int(xbt_cfg_t cfg,const char*name, int val) {
+void xbt_cfg_rm_int(xbt_cfg_t cfg,const char*name, int val) {
 
-  xbt_cfgelm_t cell;
+  xbt_cfgelm_t variable;
   int cpt,seen;
-  xbt_error_t errcode;
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_int,&cell));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_int);
   
-  xbt_dynar_foreach(cell->content,cpt,seen) {
+  if (xbt_dynar_length(variable->content) == variable->min)
+    THROW3(mismatch_error,0,
+           "Cannot remove value %d from the config element %s since it's already at its minimal size (=%d)",
+           val,name,variable->min); 
+
+  xbt_dynar_foreach(variable->content,cpt,seen) {
     if (seen == val) {
-      xbt_dynar_cursor_rm(cell->content,&cpt);
-      return no_error;
+      if (variable->cb_rm) (*variable->cb_rm)(name, cpt);
+      xbt_dynar_cursor_rm(variable->content,&cpt);
+      return;
     }
   }
 
-  ERROR2("Can't remove the value %d of config element %s: value not found.",
-	 val,name);
-  return mismatch_error;
+  THROW2(not_found_error,0,
+	 "Can't remove the value %d of config element %s: value not found.",val,name);
 }
 
-/**
- * xbt_cfg_rm_double:
- *
- * @cfg: the config set
- * @name: the name of the cell
- * @val: the value to be removed
+/** @brief Remove the provided \e val double value from a variable
  *
- * Remove the provided @val from the cell @name in @cfg.
+ * \arg cfg the config set
+ * \arg name the name of the variable
+ * \arg val the value to be removed
  */
 
-xbt_error_t xbt_cfg_rm_double(xbt_cfg_t cfg,const char*name, double val) {
-  xbt_cfgelm_t cell;
+void xbt_cfg_rm_double(xbt_cfg_t cfg,const char*name, double val) {
+  xbt_cfgelm_t variable;
   int cpt;
   double seen;
-  xbt_error_t errcode;
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_double,&cell));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_double);
   
-  xbt_dynar_foreach(cell->content,cpt,seen) {
+  if (xbt_dynar_length(variable->content) == variable->min)
+    THROW3(mismatch_error,0,
+           "Cannot remove value %f from the config element %s since it's already at its minimal size (=%d)",
+           val,name,variable->min); 
+
+  xbt_dynar_foreach(variable->content,cpt,seen) {
     if (seen == val) {
-      xbt_dynar_cursor_rm(cell->content,&cpt);
-      return no_error;
+      xbt_dynar_cursor_rm(variable->content,&cpt);
+      if (variable->cb_rm)
+	(*variable->cb_rm)(name, cpt);
+      return;
     }
   }
 
-  ERROR2("Can't remove the value %f of config element %s: value not found.",
-	 val,name);
-  return mismatch_error;
+  THROW2(not_found_error,0,
+	 "Can't remove the value %f of config element %s: value not found.",val,name);
 }
 
-/**
- * xbt_cfg_rm_string:
+/** @brief Remove the provided \e val string value from a variable
  *
- * @cfg: the config set
- * @name: the name of the cell
- * @val: the value of the string which will be removed
- *
- * Remove the provided @val from the cell @name in @cfg.
+ * \arg cfg the config set
+ * \arg name the name of the variable
+ * \arg val the value of the string which will be removed
  */
-xbt_error_t
+void
 xbt_cfg_rm_string(xbt_cfg_t cfg,const char*name, const char *val) {
-  xbt_cfgelm_t cell;
+  xbt_cfgelm_t variable;
   int cpt;
   char *seen;
-  xbt_error_t errcode;
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_string,&cell));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_string);
   
-  xbt_dynar_foreach(cell->content,cpt,seen) {
+  if (xbt_dynar_length(variable->content) == variable->min)
+    THROW3(mismatch_error,0,
+           "Cannot remove value %s from the config element %s since it's already at its minimal size (=%d)",
+           name,val,variable->min); 
+           
+  xbt_dynar_foreach(variable->content,cpt,seen) {
     if (!strcpy(seen,val)) {
-      xbt_dynar_cursor_rm(cell->content,&cpt);
-      return no_error;
+      if (variable->cb_rm)
+	(*variable->cb_rm)(name, cpt);
+      xbt_dynar_cursor_rm(variable->content,&cpt);
+      return;
     }
   }
 
-  ERROR2("Can't remove the value %s of config element %s: value not found.",
-	 val,name);
-  return mismatch_error;
+  THROW2(not_found_error,0,
+	 "Can't remove the value %s of config element %s: value not found.",val,name);
 }
 
-/**
- * xbt_cfg_rm_host:
+/** @brief Remove the provided \e val host value from a variable
  * 
- * @cfg: the config set
- * @name: the name of the cell
- * @host: the hostname
- * @port: the port number
- *
- * Remove the provided @host:@port from the cell @name in @cfg.
+ * \arg cfg the config set
+ * \arg name the name of the variable
+ * \arg host the hostname
+ * \arg port the port number
  */
 
-xbt_error_t
+void
 xbt_cfg_rm_host(xbt_cfg_t cfg,const char*name, const char *host,int port) {
-  xbt_cfgelm_t cell;
+  xbt_cfgelm_t variable;
   int cpt;
   xbt_host_t *seen;
-  xbt_error_t errcode;
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_host,&cell));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_host);
   
-  xbt_dynar_foreach(cell->content,cpt,seen) {
+  if (xbt_dynar_length(variable->content) == variable->min)
+    THROW4(mismatch_error,0,
+           "Cannot remove value %s:%d from the config element %s since it's already at its minimal size (=%d)",
+           host,port,name,variable->min); 
+           
+  xbt_dynar_foreach(variable->content,cpt,seen) {
     if (!strcpy(seen->name,host) && seen->port == port) {
-      xbt_dynar_cursor_rm(cell->content,&cpt);
-      return no_error;
+      if (variable->cb_rm) (*variable->cb_rm)(name, cpt);
+      xbt_dynar_cursor_rm(variable->content,&cpt);
+      return;
     }
   }
 
-  ERROR3("Can't remove the value %s:%d of config element %s: value not found.",
+  THROW3(not_found_error,0,
+	 "Can't remove the value %s:%d of config element %s: value not found.",
 	 host,port,name);
-  return mismatch_error;
 }
 
-/* rm everything */
+/** @brief Remove the \e pos th value from the provided variable */
 
-/**
- * xbt_cfg_empty:
+void xbt_cfg_rm_at   (xbt_cfg_t cfg, const char *name, int pos) {
+
+  xbt_cfgelm_t variable;
+
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_any);
+  
+  if (xbt_dynar_length(variable->content) == variable->min)
+    THROW3(mismatch_error,0,
+           "Cannot remove %dth value from the config element %s since it's already at its minimal size (=%d)",
+           pos,name,variable->min); 
+  
+  if (variable->cb_rm) (*variable->cb_rm)(name, pos);	  
+  xbt_dynar_remove_at(variable->content, pos, NULL);
+}
+
+/** @brief Remove all the values from a variable
  * 
- * @cfg: the config set
- * @name: the name of the cell
- *
- * rm evenything
+ * \arg cfg the config set
+ * \arg name the name of the variable
  */
 
-xbt_error_t 
+void
 xbt_cfg_empty(xbt_cfg_t cfg,const char*name) {
-  xbt_cfgelm_t cell;
-
-  xbt_error_t errcode;
-
-  TRYCATCH(mismatch_error,
-	   xbt_dict_get((xbt_dict_t)cfg,name,(void**)&cell));
-  if (errcode == mismatch_error) {
-    ERROR1("Can't empty  '%s' since this config element does not exist",
-	   name);
-    return mismatch_error;
+  xbt_cfgelm_t variable=NULL;
+  xbt_ex_t e;
+
+  TRY {
+    variable = xbt_dict_get((xbt_dict_t)cfg,name);
+  } CATCH(e) {
+    if (e.category != not_found_error)
+      RETHROW;
+
+    xbt_ex_free(e);
+    THROW1(not_found_error,0,
+	   "Can't empty  '%s' since this config element does not exist", name);
   }
 
-  if (cell) {
-    xbt_dynar_reset(cell->content);
+  if (variable) {
+    if (variable->cb_rm) {
+      int cpt;
+      void *ignored;
+      xbt_dynar_foreach(variable->content,cpt,ignored) {
+        (*variable->cb_rm)(name, cpt);
+      }
+    }
+    xbt_dynar_reset(variable->content);
   }
-  return no_error;
 }
 
 /*----[ Getting ]---------------------------------------------------------*/
 
-/**
- * xbt_cfg_get_int:
- * @cfg: the config set
- * @name: the name of the cell
- * @val: the wanted value
+/** @brief Retrieve an integer value of a variable (get a warning if not uniq)
+ *
+ * \arg cfg the config set
+ * \arg name the name of the variable
+ * \arg val the wanted value
  *
  * Returns the first value from the config set under the given name.
- * If there is more than one value, it will issue a warning. Consider using xbt_cfg_get_dynar() 
- * instead.
+ * If there is more than one value, it will issue a warning. Consider using 
+ * xbt_cfg_get_dynar() instead.
  *
- * @warning the returned value is the actual content of the config set
+ * \warning the returned value is the actual content of the config set
  */
-xbt_error_t
-xbt_cfg_get_int   (xbt_cfg_t  cfg,
-		    const char *name,
-		    int        *val) {
-  xbt_cfgelm_t cell;
-  xbt_error_t errcode;
-
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_int,&cell));
+int 
+xbt_cfg_get_int (xbt_cfg_t  cfg, const char *name) {
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_int);
 
-  if (xbt_dynar_length(cell->content) > 1) {
+  if (xbt_dynar_length(variable->content) > 1) {
     WARN2("You asked for the first value of the config element '%s', but there is %lu values",
-	     name, xbt_dynar_length(cell->content));
+	  name, xbt_dynar_length(variable->content));
   }
 
-  *val = xbt_dynar_get_as(cell->content, 0, int);
-  return no_error;
+  return xbt_dynar_get_as(variable->content, 0, int);
 }
 
-/**
- * xbt_cfg_get_double:
- * @cfg: the config set
- * @name: the name of the cell
- * @val: the wanted value
+/** @brief Retrieve a double value of a variable (get a warning if not uniq)
+ * 
+ * \arg cfg the config set
+ * \arg name the name of the variable
+ * \arg val the wanted value
  *
  * Returns the first value from the config set under the given name.
- * If there is more than one value, it will issue a warning. Consider using xbt_cfg_get_dynar() 
- * instead.
+ * If there is more than one value, it will issue a warning. Consider using 
+ * xbt_cfg_get_dynar() instead.
  *
- * @warning the returned value is the actual content of the config set
+ * \warning the returned value is the actual content of the config set
  */
 
-xbt_error_t
-xbt_cfg_get_double(xbt_cfg_t  cfg,
-		    const char *name,
-		    double     *val) {
-  xbt_cfgelm_t cell;
-  xbt_error_t  errcode;
+double
+xbt_cfg_get_double(xbt_cfg_t  cfg, const char *name) {
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_double);
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_double,&cell));
-
-  if (xbt_dynar_length(cell->content) > 1) {
+  if (xbt_dynar_length(variable->content) > 1) {
     WARN2("You asked for the first value of the config element '%s', but there is %lu values\n",
-	     name, xbt_dynar_length(cell->content));
+	     name, xbt_dynar_length(variable->content));
   }
 
-  *val = xbt_dynar_get_as(cell->content, 0, double);
-  return no_error;
+  return xbt_dynar_get_as(variable->content, 0, double);
 }
 
-/**
- * xbt_cfg_get_string:
+/** @brief Retrieve a string value of a variable (get a warning if not uniq)
  *
- * @th: the config set
- * @name: the name of the cell
- * @val: the wanted value
+ * \arg th the config set
+ * \arg name the name of the variable
+ * \arg val the wanted value
  *
  * Returns the first value from the config set under the given name.
- * If there is more than one value, it will issue a warning. Consider using xbt_cfg_get_dynar() 
- * instead.
+ * If there is more than one value, it will issue a warning. Consider using 
+ * xbt_cfg_get_dynar() instead.
  *
- * @warning the returned value is the actual content of the config set
+ * \warning the returned value is the actual content of the config set
  */
 
-xbt_error_t xbt_cfg_get_string(xbt_cfg_t  cfg,
-				 const char *name,
-				 char      **val) {
-  xbt_cfgelm_t  cell;
-  xbt_error_t errcode;
-
-  *val=NULL;
+char* xbt_cfg_get_string(xbt_cfg_t  cfg, const char *name) {
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_string);
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_string,&cell));
-
-  if (xbt_dynar_length(cell->content) > 1) {
+  if (xbt_dynar_length(variable->content) > 1) {
     WARN2("You asked for the first value of the config element '%s', but there is %lu values\n",
-	     name, xbt_dynar_length(cell->content));
+	  name, xbt_dynar_length(variable->content));
   }
 
-  *val = xbt_dynar_get_as(cell->content, 0, char *);
-  return no_error;
+  return xbt_dynar_get_as(variable->content, 0, char *);
 }
 
-/**
- * xbt_cfg_get_host:
+/** @brief Retrieve an host value of a variable (get a warning if not uniq)
  *
- * @cfg: the config set
- * @name: the name of the cell
- * @host: the host
- * @port: the port number
+ * \arg cfg the config set
+ * \arg name the name of the variable
+ * \arg host the host
+ * \arg port the port number
  *
  * Returns the first value from the config set under the given name.
- * If there is more than one value, it will issue a warning. Consider using xbt_cfg_get_dynar() 
- * instead.
+ * If there is more than one value, it will issue a warning. Consider using
+ * xbt_cfg_get_dynar() instead.
  *
- * @warning the returned value is the actual content of the config set
+ * \warning the returned value is the actual content of the config set
  */
 
-xbt_error_t xbt_cfg_get_host  (xbt_cfg_t  cfg,
-				 const char *name,
-				 char      **host,
-				 int        *port) {
-  xbt_cfgelm_t cell;
-  xbt_error_t  errcode;
+void xbt_cfg_get_host  (xbt_cfg_t   cfg,  const char *name,
+			char      **host, int        *port) {
+  xbt_cfgelm_t variable;
   xbt_host_t  *val;
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_host,&cell));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_host);
 
-  if (xbt_dynar_length(cell->content) > 1) {
+  if (xbt_dynar_length(variable->content) > 1) {
     WARN2("You asked for the first value of the config element '%s', but there is %lu values\n",
-	     name, xbt_dynar_length(cell->content));
+	     name, xbt_dynar_length(variable->content));
   }
 
-  val = xbt_dynar_get_as(cell->content, 0, xbt_host_t*);
+  val = xbt_dynar_get_as(variable->content, 0, xbt_host_t*);
   *host=val->name;
   *port=val->port;
-  
-  return no_error;
 }
 
-/**
- * xbt_cfg_get_dynar:
- * @cfg: where to search in
- * @name: what to search for
- * @dynar: result
+/** @brief Retrieve the dynar of all the values stored in a variable
+ * 
+ * \arg cfg where to search in
+ * \arg name what to search for
+ * \arg dynar result
  *
- * Get the data stored in the config bag. 
+ * Get the data stored in the config set. 
  *
- * @warning the returned value is the actual content of the config set
+ * \warning the returned value is the actual content of the config set
  */
-xbt_error_t xbt_cfg_get_dynar (xbt_cfg_t    cfg,
-				 const char   *name,
-				 xbt_dynar_t *dynar) {
-  xbt_cfgelm_t cell;
-  xbt_error_t  errcode = xbt_dict_get((xbt_dict_t)cfg,name,
-					(void**)&cell);
-
-  if (errcode == mismatch_error) {
-    ERROR1("No registered cell %s in this config set",
-	   name);
-    return mismatch_error;
+xbt_dynar_t xbt_cfg_get_dynar (xbt_cfg_t    cfg, const char *name) {
+  xbt_cfgelm_t variable=NULL;
+  xbt_ex_t     e;
+
+  TRY {
+    variable = xbt_dict_get((xbt_dict_t)cfg,name);
+  } CATCH(e) {
+    if (e.category == not_found_error) {
+      xbt_ex_free(e);
+      THROW1(not_found_error,0,
+	     "No registered variable %s in this config set",name);
+    }
+    RETHROW;
   }
-  if (errcode != no_error)
-     return errcode;
 
-  *dynar = cell->content;
-  return no_error;
+  return variable->content;
 }
 
+
+/** @brief Retrieve one of the integer value of a variable */
+int
+xbt_cfg_get_int_at(xbt_cfg_t cfg, const char *name, int pos) {
+                  
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_int);
+  return xbt_dynar_get_as(variable->content, pos, int);
+}
+
+/** @brief Retrieve one of the double value of a variable */
+double
+xbt_cfg_get_double_at(xbt_cfg_t cfg, const char *name, int pos) {
+                  
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_double);
+  return xbt_dynar_get_as(variable->content, pos, double);
+}
+
+
+/** @brief Retrieve one of the string value of a variable */
+char*
+xbt_cfg_get_string_at(xbt_cfg_t cfg, const char *name, int pos) {
+                  
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_string);
+  return xbt_dynar_get_as(variable->content, pos, char*);
+}
+
+/** @brief Retrieve one of the host value of a variable */
+void
+xbt_cfg_get_host_at(xbt_cfg_t cfg, const char *name, int pos,
+                    char **host, int *port) {
+                  
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_int);
+  xbt_host_t *val = xbt_dynar_get_ptr(variable->content, pos);
+
+  *port = val->port;
+  *host = val->name;
+}