ncurses-5.7/ncurses/tinfo/getenv_num.c

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/****************************************************************************
 *  Author: Thomas E. Dickey <dickey@clark.net> 1998                        *
 ****************************************************************************/

/*
 *	getenv_num.c -- obtain a number from the environment
 */

#include <curses.priv.h>

MODULE_ID("$Id: getenv_num.c,v 1.3 2000/12/10 02:55:07 tom Exp $")

NCURSES_EXPORT(int)
_nc_getenv_num(const char *name)
{
    char *dst = 0;
    char *src = getenv(name);
    long value;

    if ((src == 0)
	|| (value = strtol(src, &dst, 0)) < 0
	|| (dst == src)
	|| (*dst != '\0')
	|| (int) value < value)
	value = -1;

    return (int) value;
}