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/*
* ordchr.c - Builtin functions that provide ord() and chr() functions.
*
* Arnold Robbins
* arnold@skeeve.com
* 8/2001
* Revised 6/2004
*/
/*
* Copyright (C) 2001, 2004 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
*/
#include "awk.h"
/* do_ord --- return numeric value of first char of string */
static NODE *
do_ord(int nargs)
{
NODE *str;
int ret = -1;
if (do_lint && get_curfunc_arg_count() > 1)
lintwarn("ord: called with too many arguments");
str = get_scalar_argument(0, FALSE);
if (str != NULL) {
(void) force_string(str);
ret = str->stptr[0];
} else if (do_lint)
lintwarn("ord: called with no arguments");
/* Set the return value */
return make_number((AWKNUM) ret);
}
/* do_chr --- turn numeric value into a string */
static NODE *
do_chr(int nargs)
{
NODE *num;
unsigned int ret = 0;
AWKNUM val = 0.0;
char str[2];
str[0] = str[1] = '\0';
if (do_lint && get_curfunc_arg_count() > 1)
lintwarn("chr: called with too many arguments");
num = get_scalar_argument(0, FALSE);
if (num != NULL) {
val = force_number(num);
ret = val; /* convert to int */
ret &= 0xff;
str[0] = ret;
str[1] = '\0';
} else if (do_lint)
lintwarn("chr: called with no arguments");
/* Set the return value */
return make_string(str, 1);
}
/* dlload --- load new builtins in this library */
NODE *
dlload(tree, dl)
NODE *tree;
void *dl;
{
make_builtin("ord", do_ord, 1);
make_builtin("chr", do_chr, 1);
return make_number((AWKNUM) 0);
}
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