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/*
* ordchr.c - Builtin functions that provide ord() and chr() functions.
*
* Arnold Robbins
* arnold@skeeve.com
* 8/2001
* Revised 6/2004
* Revised 5/2012
*/
/*
* Copyright (C) 2001, 2004, 2011, 2012, 2013, 2018
* the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Programming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GAWK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "gawkapi.h"
#include "gettext.h"
#define _(msgid) gettext(msgid)
#define N_(msgid) msgid
static const gawk_api_t *api; /* for convenience macros to work */
static awk_ext_id_t ext_id;
static const char *ext_version = "ordchr extension: version 1.0";
static awk_bool_t (*init_func)(void) = NULL;
int plugin_is_GPL_compatible;
/* do_ord --- return numeric value of first char of string */
static awk_value_t *
do_ord(int nargs, awk_value_t *result, struct awk_ext_func *unused)
{
awk_value_t str;
double ret = -1;
assert(result != NULL);
if (get_argument(0, AWK_STRING, & str)) {
ret = str.str_value.str[0];
} else if (do_lint)
lintwarn(ext_id, _("ord: called with inappropriate argument(s)"));
/* Set the return value */
return make_number(ret, result);
}
/* do_chr --- turn numeric value into a string */
static awk_value_t *
do_chr(int nargs, awk_value_t *result, struct awk_ext_func *unused)
{
awk_value_t num;
unsigned int ret = 0;
double val = 0.0;
char str[2];
str[0] = str[1] = '\0';
assert(result != NULL);
if (get_argument(0, AWK_NUMBER, & num)) {
val = num.num_value;
ret = val; /* convert to int */
ret &= 0xff;
str[0] = ret;
str[1] = '\0';
} else if (do_lint)
lintwarn(ext_id, _("chr: called with inappropriate argument(s)"));
/* Set the return value */
return make_const_string(str, 1, result);
}
static awk_ext_func_t func_table[] = {
{ "ord", do_ord, 1, 1, awk_false, NULL },
{ "chr", do_chr, 1, 1, awk_false, NULL },
};
/* define the dl_load function using the boilerplate macro */
dl_load_func(func_table, ord_chr, "")
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