113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
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/*
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* ordchr.c - Builtin functions that provide ord() and chr() functions.
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*
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* Arnold Robbins
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* arnold@skeeve.com
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* 8/2001
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* Revised 6/2004
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* Revised 5/2012
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*/
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/*
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* Copyright (C) 2001, 2004, 2011, 2012, 2013, 2018, 2020, 2021,
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* the Free Software Foundation, Inc.
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*
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* This file is part of GAWK, the GNU implementation of the
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* AWK Programming Language.
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*
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* GAWK is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GAWK is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "gawkapi.h"
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#include "gettext.h"
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#define _(msgid) gettext(msgid)
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#define N_(msgid) msgid
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static const gawk_api_t *api; /* for convenience macros to work */
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static awk_ext_id_t ext_id;
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static const char *ext_version = "ordchr extension: version 1.0";
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static awk_bool_t (*init_func)(void) = NULL;
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int plugin_is_GPL_compatible;
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/* do_ord --- return numeric value of first char of string */
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static awk_value_t *
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do_ord(int nargs, awk_value_t *result, struct awk_ext_func *unused)
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{
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awk_value_t str;
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double ret = -1;
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assert(result != NULL);
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if (get_argument(0, AWK_STRING, & str)) {
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ret = (unsigned char) str.str_value.str[0];
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} else if (do_lint)
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lintwarn(ext_id, _("ord: first argument is not a string"));
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/* Set the return value */
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return make_number(ret, result);
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}
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/* do_chr --- turn numeric value into a string */
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static awk_value_t *
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do_chr(int nargs, awk_value_t *result, struct awk_ext_func *unused)
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{
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awk_value_t num;
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unsigned int ret = 0;
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double val = 0.0;
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char str[2];
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str[0] = str[1] = '\0';
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assert(result != NULL);
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if (get_argument(0, AWK_NUMBER, & num)) {
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val = num.num_value;
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ret = val; /* convert to int */
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ret &= 0xff;
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str[0] = ret;
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str[1] = '\0';
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} else if (do_lint)
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lintwarn(ext_id, _("chr: first argument is not a number"));
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/* Set the return value */
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return make_const_string(str, 1, result);
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}
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static awk_ext_func_t func_table[] = {
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{ "ord", do_ord, 1, 1, awk_false, NULL },
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{ "chr", do_chr, 1, 1, awk_false, NULL },
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};
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/* define the dl_load function using the boilerplate macro */
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dl_load_func(func_table, ord_chr, "")
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