1/****************************************************************************
2 * Copyright 2018,2020 Thomas E. Dickey                                     *
3 * Copyright 1998-2012,2013 Free Software Foundation, Inc.                  *
4 *                                                                          *
5 * Permission is hereby granted, free of charge, to any person obtaining a  *
6 * copy of this software and associated documentation files (the            *
7 * "Software"), to deal in the Software without restriction, including      *
8 * without limitation the rights to use, copy, modify, merge, publish,      *
9 * distribute, distribute with modifications, sublicense, and/or sell       *
10 * copies of the Software, and to permit persons to whom the Software is    *
11 * furnished to do so, subject to the following conditions:                 *
12 *                                                                          *
13 * The above copyright notice and this permission notice shall be included  *
14 * in all copies or substantial portions of the Software.                   *
15 *                                                                          *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
23 *                                                                          *
24 * Except as contained in this notice, the name(s) of the above copyright   *
25 * holders shall not be used in advertising or otherwise to promote the     *
26 * sale, use or other dealings in this Software without prior written       *
27 * authorization.                                                           *
28 ****************************************************************************/
29
30/****************************************************************************
31 *  Author: Thomas E. Dickey <dickey@clark.net> 1998                        *
32 ****************************************************************************/
33
34/*
35 *	getenv_num.c -- obtain a number from the environment
36 */
37
38#include <curses.priv.h>
39
40MODULE_ID("$Id: getenv_num.c,v 1.8 2020/02/02 23:34:34 tom Exp $")
41
42NCURSES_EXPORT(int)
43_nc_getenv_num(const char *name)
44{
45    char *dst = 0;
46    char *src = getenv(name);
47    long value;
48
49    if ((src == 0)
50	|| (value = strtol(src, &dst, 0)) < 0
51	|| (dst == src)
52	|| (*dst != '\0')
53	|| (int) value < value)
54	value = -1;
55
56    return (int) value;
57}
58
59NCURSES_EXPORT(void)
60_nc_setenv_num(const char *name, int value)
61{
62    if (name != 0 && value >= 0) {
63	char buffer[128];
64#if HAVE_SETENV
65	_nc_SPRINTF(buffer, _nc_SLIMIT(sizeof(buffer)) "%d", value);
66	setenv(name, buffer, 1);
67#elif HAVE_PUTENV
68	char *s;
69	_nc_SPRINTF(buffer, _nc_SLIMIT(sizeof(buffer)) "%s=%d", name, value);
70	if ((s = strdup(buffer)) != 0)
71	    putenv(s);
72#else
73#error expected setenv/putenv functions
74#endif
75    }
76}
77