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/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

/*

  dyninit

  This program extracts all the initialisation procedures from a SunOS

  object file.  It then writes out a .s file containing a function 

  (___TDF_main) which contains calls to each of these procedures.

  Initialisation procedures are identified by the ___I.TDF prefix.

  Note: the actual prefix starts with two '_'s but SunOS inserts

  an extra one.

  the command line syntax is

  dyninit <name of object file> <name of destination (.s) file>

*/

#include <stdio.h>

#include <sun3/a.out.h>

#include "ossg.h"

#define MAJOR_VERSION		1

#define MINOR_VERSION		1

void fail PROTO_S((char *));

FILE *open_file PROTO_S((char *,char *));

#define open_file_read(x)	open_file(x,"r")

#define open_file_write(x)	open_file(x,"w")

FILE *open_file

    PROTO_N((filename,option))

    PROTO_T(char *filename X char *option)

{

  FILE * ret_fp;

  if(ret_fp = fopen(filename,option)){

    return ret_fp;

  }

  else{

    fprintf(stderr,"Cannot open file <%s>\n",filename);

    exit(1);

  }

}

typedef struct exec EXEC_STRUCT;

typedef struct nlist SYMBOL_STRUCT;

#define INIT_FUNC_NAME "___TDF_main"

EXEC_STRUCT header;

SYMBOL_STRUCT symbol;

void fail

    PROTO_N((message))

    PROTO_T(char *message)

{

  fprintf(stderr,"*fail* : %s\n",message);

  exit(1);

}

/*#define symbol_is_function(x) (x.n_type & N_TEXT)*/

#define is_intitialisation_function(x) (!strncmp(x+1,"__I.TDF",7))

#define is_function(x) 1

void print_ass_preamble

    PROTO_N((of))

    PROTO_T(FILE *of)

{

  fprintf(of,".text\n");

  fprintf(of,"\t.even\n");

  fprintf(of,".globl %s\n",INIT_FUNC_NAME);

  fprintf(of,"%s:\n",INIT_FUNC_NAME);

  return;

}

void print_ass_postlude

    PROTO_N((of))

    PROTO_T(FILE *of)

{

  fprintf(of,"\trts\n");

}

void construct_init_proc

    PROTO_N((fp,symtab_pos,stringtab_pos,header,outname))

    PROTO_T(FILE *fp X long symtab_pos X long stringtab_pos X

	    EXEC_STRUCT header X char *outname)

{

  int i;

  char str[256];

  long keeppos;

  FILE *outfile;

  if(!(outfile = open_file_write(outname))){

    fail("Cannot Open output file");

  }

  fseek(fp,symtab_pos,0);

  print_ass_preamble(outfile);

  for(i=0;i<header.a_syms/sizeof(SYMBOL_STRUCT);++i){

    fread(&symbol,sizeof(SYMBOL_STRUCT),1,fp);

    if(is_function(symbol)){

      keeppos = ftell(fp);

      fseek(fp,stringtab_pos+symbol.n_un.n_strx,0);

      fgets(str,256,fp);

      if(is_intitialisation_function(str)){

	fprintf(outfile,"\tjbsr\t%s\n",str);

      }

      fseek(fp,keeppos,0);

    }

  }

  print_ass_postlude(outfile);

  return;

}

void process_flag

    PROTO_N((option))

    PROTO_T(char *option)

{

  switch(option[1]) {

    case 'V':

    case 'v': {

      (void)fprintf(stderr,"Dynamic initialisation linker V%d.%d\n",

		    MAJOR_VERSION,MINOR_VERSION);

      break;

    }

    default: {

      (void)fprintf(stderr,"Error: unknown option %s\n",option);

    }

  }

  return;

}

int main

    PROTO_N((argc,argv))

    PROTO_T(int argc X char **argv)

{

  FILE *fp;

  long symtab_pos,stringtab_pos;

  int i;

  int symsize;

  char str[80];

  long keeppos;

  int num_flags = 0;

  for(i=1;i<argc;++i) {

    if(argv[i][0] == '-') {

      num_flags++;

      process_flag(argv[i]);

    }

  }

  if(argc - num_flags < 3) {

    fprintf(stderr,"*fail*: syntax is %s [-options] <input filename> <output filename>\n",argv[0]);

    exit(1);

  }

  fp = open_file_read(argv[1+num_flags]);

  fread(&header,sizeof(EXEC_STRUCT),1,fp);

  if(N_BADMAG(header)){

    fail("Bad magic number\n");

  }

  symtab_pos = N_SYMOFF(header);

  stringtab_pos = N_STROFF(header);

  construct_init_proc(fp,symtab_pos,stringtab_pos,header,argv[2+num_flags]);

  return 0;

}