/********************************************
init.c
copyright 1991, Michael D. Brennan

This is a source file for mawk, an implementation of
the AWK programming language.

Mawk is distributed without warranty under the terms of
the GNU General Public License, version 2, 1991.
********************************************/


/* $Log: init.c,v $
 * Revision 1.11  1995/08/20  17:35:21  mike
 * include <stdlib.h> for MSC, needed for environ decl
 *
 * Revision 1.10  1995/06/09  22:51:50  mike
 * silently exit(0) if no program
 *
 * Revision 1.9  1995/06/06  00:18:30  mike
 * change mawk_exit(1) to mawk_exit(2)
 *
 * Revision 1.8  1994/12/14  14:40:34  mike
 * -Wi option
 *
 * Revision 1.7  1994/12/11  22:43:20  mike
 * don't assume **environ is writable
 *
 * Revision 1.6  1994/12/11  22:14:16  mike
 * remove THINK_C #defines.  Not a political statement, just no indication
 * that anyone ever used it.
 *
 * Revision 1.5  1994/10/08  19:15:45  mike
 * remove SM_DOS
 *
 * Revision 1.4  1994/03/11  02:23:49  mike
 * -We option
 *
 * Revision 1.3  1993/07/17  00:45:14  mike
 * indent
 *
 * Revision 1.2	 1993/07/04  12:52:00  mike
 * start on autoconfig changes
 *
 * Revision 5.5	 1993/01/07  02:50:33  mike
 * relative vs absolute code
 *
 * Revision 5.4	 1992/12/24  01:58:19  mike
 * 1.1.2d changes for MsDOS
 *
 * Revision 5.3	 1992/07/10  16:17:10  brennan
 * MsDOS: remove NO_BINMODE macro
 *
 * Revision 5.2	 1992/01/09  08:46:14  brennan
 * small change for MSC
 *
 * Revision 5.1	 91/12/05  07:56:07  brennan
 * 1.1 pre-release
 *
*/


/* init.c */
#include "mawk.h"
#include "code.h"
#include "memory.h"
#include "symtype.h"
#include "init.h"
#include "bi_vars.h"
#include "field.h"

#ifdef MSDOS
#include <fcntl.h>
#ifdef MSDOS_MSC
#include <stdlib.h>
#endif
#endif

static void PROTO(process_cmdline, (int, char **)) ;
static void PROTO(set_ARGV, (int, char **, int)) ;
static void PROTO(bad_option, (char *)) ;
static void PROTO(no_program, (void)) ;

extern void PROTO(print_version, (void)) ;
extern int PROTO(is_cmdline_assign, (char *)) ;

#if  MSDOS
void PROTO(stdout_init, (void)) ;
#if  HAVE_REARGV
void PROTO(reargv, (int *, char ***)) ;
#endif
#endif

char *progname ;
short interactive_flag = 0 ;

#ifndef	 SET_PROGNAME
#define	 SET_PROGNAME() \
   {char *p = strrchr(argv[0],'/') ;\
    progname = p ? p+1 : argv[0] ; }
#endif

void
initialize(argc, argv)
int argc ; char **argv ;
{

   SET_PROGNAME() ;

   bi_vars_init() ;		 /* load the builtin variables */
   bi_funct_init() ;		 /* load the builtin functions */
   kw_init() ;			 /* load the keywords */
   field_init() ;

#if   MSDOS
   {
      char *p = getenv("MAWKBINMODE") ;

      if (p)  set_binmode(atoi(p)) ;
   }
#endif


   process_cmdline(argc, argv) ;

   code_init() ;
   fpe_init() ;
   set_stderr() ;

#if  MSDOS
   stdout_init() ;
#endif
}

int dump_code_flag ;		 /* if on dump internal code */
short posix_space_flag ;

#ifdef	 DEBUG
int dump_RE ;			 /* if on dump compiled REs  */
#endif


static void
bad_option(s)
   char *s ;
{
   errmsg(0, "not an option: %s", s) ; mawk_exit(2) ; 
}

static void
no_program()
{
   mawk_exit(0) ;
}

static void
process_cmdline(argc, argv)
   int argc ;
   char **argv ;
{
   int i, nextarg ;
   char *optarg ;
   PFILE dummy ;		 /* starts linked list of filenames */
   PFILE *tail = &dummy ;

   for (i = 1; i < argc && argv[i][0] == '-'; i = nextarg)
   {
      if (argv[i][1] == 0)	/* -  alone */
      {
	 if (!pfile_name) no_program() ;
	 break ;		 /* the for loop */
      }
      /* safe to look at argv[i][2] */

      if (argv[i][2] == 0)
      {
	 if (i == argc - 1 && argv[i][1] != '-')
	 {
	    if (strchr("WFvf", argv[i][1]))
	    {
	       errmsg(0, "option %s lacks argument", argv[i]) ;
	       mawk_exit(2) ;
	    }
	    bad_option(argv[i]) ;
	 }

	 optarg = argv[i + 1] ;
	 nextarg = i + 2 ;
      }
      else  /* argument glued to option */
      {
	 optarg = &argv[i][2] ;
	 nextarg = i + 1 ;
      }

      switch (argv[i][1])
      {
	 case 'W':

	    if (optarg[0] >= 'a' && optarg[0] <= 'z')
	       optarg[0] += 'A' - 'a' ;
	    if (optarg[0] == 'V')  print_version() ;
	    else if (optarg[0] == 'D')
	    {
	       dump_code_flag = 1 ;
	    }
	    else if (optarg[0] == 'S')
	    {
	       char *p = strchr(optarg, '=') ;
	       int x = p ? atoi(p + 1) : 0 ;

	       if (x > SPRINTF_SZ)
	       {
		  sprintf_buff = (char *) zmalloc(x) ;
		  sprintf_limit = sprintf_buff + x ;
	       }
	    }
#if  MSDOS
	    else if (optarg[0] == 'B')
	    {
	       char *p = strchr(optarg, '=') ;
	       int x = p ? atoi(p + 1) : 0 ;

	       set_binmode(x) ;
	    }
#endif
	    else if (optarg[0] == 'P')
	    {
	       posix_space_flag = 1 ;
	    }
	    else if (optarg[0] == 'E')
	    {
	       if ( pfile_name )
	       {
		  errmsg(0, "-W exec is incompatible with -f") ;
		  mawk_exit(2) ;
	       }
	       else if ( nextarg == argc ) no_program() ;

	       pfile_name = argv[nextarg] ;
	       i = nextarg + 1 ;
	       goto no_more_opts ;
	    }
	    else if (optarg[0] == 'I')
	    {
	       interactive_flag = 1 ;
	       setbuf(stdout,(char*)0) ;
	    }
	    else  errmsg(0, "vacuous option: -W %s", optarg) ;


	    break ;

	 case 'v':
	    if (!is_cmdline_assign(optarg))
	    {
	       errmsg(0, "improper assignment: -v %s", optarg) ;
	       mawk_exit(2) ;
	    }
	    break ;

	 case 'F':

	    rm_escape(optarg) ;	 /* recognize escape sequences */
	    cell_destroy(FS) ;
	    FS->type = C_STRING ;
	    FS->ptr = (PTR) new_STRING(optarg) ;
	    cast_for_split(cellcpy(&fs_shadow, FS)) ;
	    break ;

	 case '-':
	    if (argv[i][2] != 0)  bad_option(argv[i]) ;
	    i++ ;
	    goto no_more_opts ;

	 case 'f':
	    /* first file goes in pfile_name ; any more go
	       on a list */
	    if (!pfile_name)  pfile_name = optarg ;
	    else
	    {
	       tail = tail->link = ZMALLOC(PFILE) ;
	       tail->fname = optarg ;
	    }
	    break ;

	 default:
	    bad_option(argv[i]) ;
      }
   }

 no_more_opts:

   tail->link = (PFILE *) 0 ;
   pfile_list = dummy.link ;

   if (pfile_name)
   {
      set_ARGV(argc, argv, i) ;
      scan_init((char *) 0) ;
   }
   else	 /* program on command line */
   {
      if (i == argc)  no_program() ;
      set_ARGV(argc, argv, i + 1) ;

#if  MSDOS && ! HAVE_REARGV	/* reversed quotes */
      {
	 char *p ;

	 for (p = argv[i]; *p; p++)
	    if (*p == '\'')  *p = '\"' ;
      }
#endif
      scan_init(argv[i]) ;
/* #endif  */
   }
}


static void
set_ARGV(argc, argv, i)
int argc ; char **argv ;
   int i ;			 /* argv[i] = ARGV[i] */
{
   SYMTAB *st_p ;
   CELL argi ;
   register CELL *cp ;

   st_p = insert("ARGV") ;
   st_p->type = ST_ARRAY ;
   Argv = st_p->stval.array = new_ARRAY() ;
   argi.type = C_DOUBLE ;
   argi.dval = 0.0 ;
   cp = array_find(st_p->stval.array, &argi, CREATE) ;
   cp->type = C_STRING ;
   cp->ptr = (PTR) new_STRING(progname) ;

   /* ARGV[0] is set, do the rest
     The type of ARGV[1] ... should be C_MBSTRN
     because the user might enter numbers from the command line */

   for (argi.dval = 1.0; i < argc; i++, argi.dval += 1.0)
   {
      cp = array_find(st_p->stval.array, &argi, CREATE) ;
      cp->type = C_MBSTRN ;
      cp->ptr = (PTR) new_STRING(argv[i]) ;
   }
   ARGC->type = C_DOUBLE ;
   ARGC->dval = argi.dval ;
}


/*----- ENVIRON ----------*/

void
load_environ(ENV)
   ARRAY ENV ;
{
   CELL c ;
#ifndef	 MSDOS_MSC		/* MSC declares it near */
   extern char **environ ;
#endif
   register char **p = environ ; /* walks environ */
   char *s ;			 /* looks for the '=' */
   CELL *cp ;			 /* pts at ENV[&c] */

   c.type = C_STRING ;

   while (*p)
   {
      if (s = strchr(*p, '='))	/* shouldn't fail */
      {
	 int len = s - *p ;
	 c.ptr = (PTR) new_STRING0(len) ;
	 memcpy(string(&c)->str, *p, len) ;
	 s++ ;

	 cp = array_find(ENV, &c, CREATE) ;
	 cp->type = C_MBSTRN ;
	 cp->ptr = (PTR) new_STRING(s) ;

	 free_STRING(string(&c)) ;
      }
      p++ ;
   }
}