bi_vars.c

/********************************************
bi_vars.c
copyright 2009-2013,2024, Thomas E. Dickey
copyright 1991-1992,1993, 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.
********************************************/

/*
 * $MawkId: bi_vars.c,v 1.13 2024/08/25 17:47:59 tom Exp $
 */

#define Visible_CELL
#define Visible_STRING
#define Visible_SYMTAB

#include <mawk.h>
#include <symtype.h>
#include <bi_vars.h>
#include <field.h>
#include <init.h>
#include <memory.h>

/* the builtin variables */
CELL bi_vars[NUM_BI_VAR];

/* the order here must match the order in bi_vars.h */

static const char *bi_var_names[NUM_BI_VAR] =
{
    "NR",
    "FNR",
    "ARGC",
    "FILENAME",
    "OFS",
    "ORS",
    "RLENGTH",
    "RSTART",
    "SUBSEP"
#if USE_BINMODE
    ,"BINMODE"
#endif
};

/* insert the builtin vars in the hash table */

void
bi_vars_init(void)
{
    register int i;
    register SYMTAB *s;

    for (i = 0; i < NUM_BI_VAR; i++) {
	s = insert(bi_var_names[i]);
	s->type = (char) ((i <= 1) ? ST_NR : ST_VAR);
	s->stval.cp = bi_vars + i;
	/* bi_vars[i].type = 0 which is C_NOINIT */
    }

    s = insert("ENVIRON");
    s->type = ST_ENV;

    /* set defaults */

    FILENAME->type = C_STRING;
    FILENAME->ptr = (PTR) new_STRING("");

    OFS->type = C_STRING;
    OFS->ptr = (PTR) new_STRING(" ");

    ORS->type = C_STRING;
    ORS->ptr = (PTR) new_STRING("\n");

    SUBSEP->type = C_STRING;
    SUBSEP->ptr = (PTR) new_STRING("\034");

    NR->type = FNR->type = C_DOUBLE;
    /* dval is already 0.0 */

#if USE_BINMODE
    BINMODE->type = C_DOUBLE;
#endif
}

#ifdef NO_LEAKS
void
bi_vars_leaks(void)
{
    int n;

    for (n = 0; n < NUM_BI_VAR; ++n) {
	switch (bi_vars[n].type) {
	case C_STRING:
	case C_STRNUM:
	case C_MBSTRN:
	    free_STRING(string(&bi_vars[n]));
	    break;
	}
    }
}
#endif