src/variable.c

   1 /*--- variable.c -------------------------------------------------------------
   2 Copyright (C) 2004, 2005, 2006 Sylvain Fourmanoit <syfou@users.sourceforge.net>
   3
   4 Permission is hereby granted, free of charge, to any person obtaining a copy
   5 of this software and associated documentation files (the "Software"), to
   6 deal in the Software without restriction, including without limitation the
   7 rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   8 sell copies of the Software, and to permit persons to whom the Software is
   9 furnished to do so, subject to the following conditions:
  10
  11 The above copyright notice and this permission notice shall be included in
  12 all copies of the Software and its documentation and acknowledgment shall be
  13 given in the documentation and software packages that this Software was
  14 used.
  15
  16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  20 IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22 ------------------------------------------------------------------------------*/
  23 /* Textual variables related functions
  24  */
  25
  26 /*----------------------------------------------------------------------------*/
  27 #include "variable.h"                   /* Variable header */
  28
  29 /*----------------------------------------------------------------------------*/
  30 extern char * dupstr(const char *s);    /* Defined in command.c */
  31
  32 /*----------------------------------------------------------------------------*/
  33 var_item *
  34 variable_create(const char * name, const char * value)
  35 {
  36   var_item * item;
  37   if ((item=malloc(sizeof(var_item)))) {
  38     item->name=dupstr(name);
  39     item->value=dupstr(value);
  40   }
  41   return item;
  42 }
  43
  44 /*----------------------------------------------------------------------------*/
  45 int
  46 variable_search_func(void* item, void* name)
  47 {
  48   return strcmp(((var_item*)item)->name,(char*)name)==0;
  49 }
  50
  51 /*----------------------------------------------------------------------------*/
  52 /* This is the big ugly variable expansion routine. It takes each first group
  53    from matching /$([^$[:space:]]*)/ and expands it to its found value
  54    in the *vars vertor. C is definitely not the best tool
  55    for string manipulation.
  56  */
  57 void
  58 variable_expansion(vector * vars, char ** old)
  59 {
  60   int i,j,k,l,size;
  61   uint dummy;
  62   char * new, * var;
  63   var_item * v_item;
  64
  65   if(*old) {
  66     size=strlen(*old)+1;
  67     if ((new=malloc(sizeof(char)*size))) {
  68       for(i=0,j=0;(*old)[i];++i) {
  69         if ((*old)[i]!='$')
  70           new[j++]=(*old)[i];
  71         else
  72           if ((*old)[i+1]!='$') {
  73             for(k=i+1;
  74                 (*old)[k] &&
  75                   (*old)[k]!=' ' && (*old)[k]!='\t' && (*old)[k]!='$';
  76                 ++k);
  77             if((var=malloc(sizeof(char)*(k-i)))) {
  78               strncpy(var,(*old)+i+1,(k-i-1));
  79               var[k-i-1]=(char)0;
  80               if ((v_item=vector_find(vars,
  81                                       &dummy,
  82                                       variable_search_func,var))) {
  83                 size+=strlen(v_item->value)+1;
  84                 new=realloc(new,sizeof(char)*size);
  85                 for(l=0;v_item->value[l];++l)
  86                   new[j+l]=v_item->value[l];
  87                 j+=l;
  88               }
  89               free(var);var=NULL;
  90             }
  91             i=k-1;
  92           } else {
  93             new[j++]='$';
  94             if ((*old)[i+1])
  95               ++i;
  96           }
  97       }
  98       new[j]=0;
  99       free(*old);
 100       (*old)=new;
 101     }
 102   }
 103 }
 104
 105 /*----------------------------------------------------------------------------*/
 106 void *
 107 variable_vector_free_item(void* item)
 108 {
 109   TRY_RESET;
 110   TRY(free(((var_item*)item)->name));
 111   if (TRY_SUCCESS) {
 112     TRY(free(((var_item*)item)->value));
 113     if (TRY_SUCCESS)
 114       TRY(free(item));
 115   }
 116 #ifdef DEBUG
 117   if (!TRY_SUCCESS)
 118     debug("Ouch! Memory leak while freeing variable.");
 119 #endif
 120   return NULL;
 121 }
 122
 123 /*----------------------------------------------------------------------------*/