| 1 | /*
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| 2 | * ordchr.c - Builtin functions that provide ord() and chr() functions.
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| 3 | *
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| 4 | * Arnold Robbins
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| 5 | * arnold@skeeve.com
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| 6 | * 8/2001
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| 7 | * Revised 6/2004
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * Copyright (C) 2001, 2004 the Free Software Foundation, Inc.
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| 12 | *
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| 13 | * This file is part of GAWK, the GNU implementation of the
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| 14 | * AWK Programming Language.
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| 15 | *
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| 16 | * GAWK is free software; you can redistribute it and/or modify
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| 17 | * it under the terms of the GNU General Public License as published by
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| 18 | * the Free Software Foundation; either version 2 of the License, or
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| 19 | * (at your option) any later version.
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| 20 | *
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| 21 | * GAWK is distributed in the hope that it will be useful,
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| 22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 24 | * GNU General Public License for more details.
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| 25 | *
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| 26 | * You should have received a copy of the GNU General Public License
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| 27 | * along with this program; if not, write to the Free Software
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| 28 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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| 29 | */
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| 30 |
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| 31 | #include "awk.h"
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| 32 |
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| 33 | /* do_ord --- return numeric value of first char of string */
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| 34 |
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| 35 | static NODE *
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| 36 | do_ord(tree)
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| 37 | NODE *tree;
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| 38 | {
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| 39 | NODE *str;
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| 40 | int ret = -1;
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| 41 |
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| 42 | if (do_lint && get_curfunc_arg_count() > 1)
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| 43 | lintwarn("ord: called with too many arguments");
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| 44 |
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| 45 | str = get_argument(tree, 0);
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| 46 | if (str != NULL) {
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| 47 | (void) force_string(str);
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| 48 | ret = str->stptr[0];
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| 49 | free_temp(str);
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| 50 | } else if (do_lint)
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| 51 | lintwarn("ord: called with no arguments");
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| 52 |
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| 53 |
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| 54 | /* Set the return value */
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| 55 | set_value(tmp_number((AWKNUM) ret));
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| 56 |
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| 57 | /* Just to make the interpreter happy */
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| 58 | return tmp_number((AWKNUM) 0);
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| 59 | }
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| 60 |
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| 61 | /* do_chr --- turn numeric value into a string */
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| 62 |
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| 63 | static NODE *
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| 64 | do_chr(tree)
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| 65 | NODE *tree;
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| 66 | {
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| 67 | NODE *num;
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| 68 | unsigned int ret = 0;
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| 69 | AWKNUM val = 0.0;
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| 70 | char str[2];
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| 71 |
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| 72 | str[0] = str[1] = '\0';
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| 73 |
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| 74 | if (do_lint && get_curfunc_arg_count() > 1)
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| 75 | lintwarn("chr: called with too many arguments");
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| 76 |
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| 77 | num = get_argument(tree, 0);
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| 78 | if (num != NULL) {
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| 79 | val = force_number(num);
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| 80 | ret = val; /* convert to int */
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| 81 | free_temp(num);
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| 82 | ret &= 0xff;
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| 83 | str[0] = ret;
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| 84 | str[1] = '\0';
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| 85 | } else if (do_lint)
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| 86 | lintwarn("chr: called with no arguments");
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| 87 |
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| 88 |
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| 89 | /* Set the return value */
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| 90 | set_value(tmp_string(str, 1));
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| 91 |
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| 92 | /* Just to make the interpreter happy */
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| 93 | return tmp_number((AWKNUM) 0);
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| 94 | }
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| 95 |
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| 96 | /* dlload --- load new builtins in this library */
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| 97 |
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| 98 | NODE *
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| 99 | dlload(tree, dl)
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| 100 | NODE *tree;
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| 101 | void *dl;
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| 102 | {
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| 103 | make_builtin("ord", do_ord, 1);
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| 104 | make_builtin("chr", do_chr, 1);
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| 105 |
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| 106 | return tmp_number((AWKNUM) 0);
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| 107 | }
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