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/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
*/
#define import_spp
#define import_libc
#define import_xnames
#include <iraf.h>
/*
** ENVGET[SBI] -- Assorted routines for fetching the values of environment
** variables.
** ENVPUTS -- Set or redefine the value of an environment variable.
** ENVRESET -- Reset (overwrite) the value of an environment variable.
*/
#define SZ_VALUESTR SZ_COMMAND
static XCHAR valuestr[SZ_VALUESTR+1];
static XINT len_valuestr = SZ_VALUESTR;
/* ENVGET -- (Near) emulation of the UNIX getenv procedure. This is a handy
** routine for looking up environment variables in C programs. The value is
** fetched into an internal static array and a pointer to this array is returned
** as the function value, else NULL if the environment variable is not found.
** The caller is responsible for using the value string before it is overwritten
** by the next call.
*/
char *
envget (
char *var /* environment variable name */
)
{
if (ENVFIND (c_sppstr(var), valuestr, &len_valuestr) < 0)
return (NULL);
else
return (c_strpak (valuestr, (char *)valuestr, len_valuestr+1));
}
/* C_ENVGETS -- Fetch the string value of an environment variable into the
** output string. Return the strlen length of the output string as the
** function value. If the variable is not found and the process is being
** used interactively a query is generated. If no value is given in response
** to the query or the process is noninteractive and the variable is not
** found, zero is returned.
*/
int
c_envgets (
char *var, /* name of variable to be fetched */
char *outstr, /* output string */
int maxch /* length including EOS */
)
{
register int nchars;
if ((nchars = ENVGETS (c_sppstr(var), valuestr, &len_valuestr)) < 0)
return (nchars);
else {
c_strpak (valuestr, outstr, maxch);
return (nchars > maxch ? maxch : nchars);
}
}
/* C_ENVFIND -- Just like ENVGETS, except that a query will not be generated
** even if working interactively.
*/
int
c_envfind (
char *var, /* name of variable to be fetched */
char *outstr, /* output string */
int maxch /* length including EOS */
)
{
register int nchars;
if ((nchars = ENVFIND (c_sppstr(var), valuestr, &len_valuestr)) < 0)
return (nchars);
else {
c_strpak (valuestr, outstr, maxch);
return (nchars > maxch ? maxch : nchars);
}
}
/* C_ENVGETB -- Return the boolean value of an environment variable. An error
** action is taken if the variable is not found or the value string cannot
** be interpreted as a boolean value.
*/
int
c_envgetb (
char *var /* name of variable to be fetched */
)
{
return ((int) BTOI ((XINT) ENVGETB (c_sppstr(var))));
}
/* C_ENVGETI -- Return the integer value of an environment variable. An error
** action is taken if the variable is not found or the value string cannot
** be interpreted as an integer value.
*/
int
c_envgeti (
char *var /* name of variable to be fetched */
)
{
return ((int) ENVGETI (c_sppstr(var)));
}
/* C_ENVPUTS -- Set or redefine the value of an environment variable. If the
** variable is not defined a new entry is created. If the variable is already
** defined but has a different value it is redefined, with the new definition
** having precedence over the former (redefinitions can be undone; see envmark
** and envfree). If the variable is already defined and the new definition
** has the same value, it is ignored.
**
** Arguments: set var = value
*/
void
c_envputs (
char *var, /* name of variable to be set */
char *value /* value string */
)
{
ENVPUTS (c_sppstr(var), c_strupk (value, valuestr, SZ_VALUESTR));
}
/* C_ENVRESET -- Reset (overwrite) the value of an environment variable.
** If the variable is not defined a new entry is created.
*/
void
c_envreset (
char *var, /* name of variable to be set */
char *value /* value string */
)
{
ENVRESET (c_sppstr(var), c_strupk (value, valuestr, SZ_VALUESTR));
}
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