source/aparser/header.awk

   1 # produce a header file for a parsed struct file
   2
   3 function header_elstring(elnum,
   4                          LOCAL, elem)
   5 {
   6         array_len = elements[elnum, "array_len"];
   7         elem=elements[elnum, "elem"];
   8         if (elements[elnum, "ptr"]=="1") elem="*"elem;
   9         if (array_len!="") {
  10                 if (is_constant(array_len) == 1) {
  11                         elem=elem"["array_len"]";
  12                 } else {
  13                         elem="*"elem;
  14                 }
  15         }
  16         return elem;
  17 }
  18
  19 function header_element(f, elnum,
  20                         LOCAL, type)
  21 {
  22         type=elements[elnum, "type"];
  23         if (substr(type,1,1) == ".") return;
  24         xprintf(f,"\t%s %s;\n", type, header_elstring(elnum));
  25 }
  26
  27 function header_union(f, elnum,
  28                       LOCAL, i)
  29 {
  30         xprintf(f,"\tunion {\n");
  31         for (i=0;i<unions[elnum, "num_elems"];i++) {
  32                 header_element(f, unions[elnum, i]);
  33         }
  34         xprintf(f,"\t} %s;\n", header_elstring(elnum));
  35 }
  36
  37 function header_elem(f, elnum)
  38 {
  39
  40         if (elements[elnum, "type"] == "union") {
  41                 header_union(f, elnum);
  42         } else {
  43                 header_element(f, elnum);
  44         }
  45 }
  46
  47 function header_struct(f, struct_num,
  48                        LOCAL, i)
  49 {
  50         xprintf(f,"/* structure %s */\n",
  51                structs[struct_num, "name"]);
  52         xprintf(f,"typedef struct {\n");
  53         for (i=0;i < structs[struct_num, "num_elems"];i++) {
  54                 header_elem(f, structs[struct_num, i]);
  55         }
  56         xprintf(f,"} %s;\n\n\n", structs[struct_num, "name"]);
  57 }
  58
  59
  60 function produce_headers(f, NIL,
  61                          LOCAL, i)
  62 {
  63         xprintf(f,"/* auto-generated headers for %s */\n\n\n", module);
  64         xprintf(f,"#ifndef _%s_\n", module);
  65         xprintf(f,"#define _%s_\n", module);
  66
  67         xprintf(f,"\n\n");
  68         for (i=0;i < num_options;i++) {
  69                 xprintf(f,"#define OPTION_%s %s\n",
  70                         options[i, "name"], options[i, "value"]);
  71         }
  72         xprintf(f,"\n\n");
  73
  74         for (i=0;i < num_structs;i++) {
  75                 header_struct(f, i);
  76         }
  77         xprintf(f,"/* end auto-generated headers */\n\n");
  78         xprintf(f,"#endif /* _%s_ */\n", module);
  79 }
  80