library/debug.c

   1 /*
   2  * Management of the debugging channels
   3  *
   4  * Copyright 2000 Alexandre Julliard
   5  */
   6
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <unistd.h>
  10 #include <ctype.h>
  11
  12 struct dll
  13 {
  14     struct dll   *next;        /* linked list of dlls */
  15     struct dll   *prev;
  16     char * const *channels;    /* array of channels */
  17     int           nb_channels; /* number of channels in array */
  18 };
  19
  20 static struct dll *first_dll;
  21
  22 struct option
  23 {
  24     struct option *next;       /* next option in list */
  25     unsigned char  set;        /* bits to set */
  26     unsigned char  clear;      /* bits to clear */
  27     char           name[14];   /* channel name, or empty for "all" */
  28 };
  29
  30 static struct option *first_option;
  31 static struct option *last_option;
  32
  33
  34 static int cmp_name( const void *p1, const void *p2 )
  35 {
  36     const char *name = p1;
  37     const char * const *chan = p2;
  38     return strcmp( name, *chan + 1 );
  39 }
  40
  41 /* apply a debug option to the channels of a given dll */
  42 static void apply_option( struct dll *dll, const struct option *opt )
  43 {
  44     if (opt->name[0])
  45     {
  46         char **dbch = bsearch( opt->name, dll->channels, dll->nb_channels,
  47                                sizeof(*dll->channels), cmp_name );
  48         if (dbch) **dbch = (**dbch & ~opt->clear) | opt->set;
  49     }
  50     else /* all */
  51     {
  52         int i;
  53         for (i = 0; i < dll->nb_channels; i++)
  54             dll->channels[i][0] = (dll->channels[i][0] & ~opt->clear) | opt->set;
  55     }
  56 }
  57
  58 /* register a new set of channels for a dll */
  59 void *__wine_dbg_register( char * const *channels, int nb )
  60 {
  61     struct option *opt = first_option;
  62     struct dll *dll = malloc( sizeof(*dll) );
  63     if (dll)
  64     {
  65         dll->channels = channels;
  66         dll->nb_channels = nb;
  67         dll->prev = NULL;
  68         if ((dll->next = first_dll)) dll->next->prev = dll;
  69         first_dll = dll;
  70
  71         /* apply existing options to this dll */
  72         while (opt)
  73         {
  74             apply_option( dll, opt );
  75             opt = opt->next;
  76         }
  77     }
  78     return dll;
  79 }
  80
  81
  82 /* unregister a set of channels; must pass the pointer obtained from wine_dbg_register */
  83 void __wine_dbg_unregister( void *channel )
  84 {
  85     struct dll *dll = channel;
  86     if (dll)
  87     {
  88         if (dll->next) dll->next->prev = dll->prev;
  89         if (dll->prev) dll->prev->next = dll->next;
  90         else first_dll = dll->next;
  91         free( dll );
  92     }
  93 }
  94
  95
  96 /* add a new debug option at the end of the option list */
  97 void wine_dbg_add_option( const char *name, unsigned char set, unsigned char clear )
  98 {
  99     struct dll *dll = first_dll;
 100     struct option *opt;
 101
 102     if (!(opt = malloc( sizeof(*opt) ))) return;
 103     opt->next  = NULL;
 104     opt->set   = set;
 105     opt->clear = clear;
 106     strncpy( opt->name, name, sizeof(opt->name) );
 107     opt->name[sizeof(opt->name)-1] = 0;
 108     if (last_option) last_option->next = opt;
 109     else first_option = opt;
 110     last_option = opt;
 111
 112     /* apply option to all existing dlls */
 113     while (dll)
 114     {
 115         apply_option( dll, opt );
 116         dll = dll->next;
 117     }
 118 }