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#include <stdlib.h>
#include <string.h>
/*
**GRGENV -- get value of PGPLOT environment parameter (Next)
*+
* SUBROUTINE GRGENV(NAME, VALUE, L)
* CHARACTER*(*) NAME, VALUE
* INTEGER L
*
* Return the value of a PGPLOT environment parameter. In Sun/Convex-UNIX,
* environment parameters are UNIX environment variables; e.g. parameter
* ENVOPT is environment variable PGPLOT_ENVOPT. Translation is not
* recursive and is case-sensitive.
*
* Arguments:
* NAME : (input) the name of the parameter to evaluate.
* VALUE : receives the value of the parameter, truncated or extended
* with blanks as necessary. If the parameter is undefined,
* a blank string is returned.
* L : receives the number of characters in VALUE, excluding
* trailing blanks. If the parameter is undefined, zero is
* returned.
*--
* 13-Nov-1994 - [mcs] Absoft FORTRAN callable C version for NeXT.
*-----------------------------------------------------------------------
*/
void GRGENV(name, value, length, name_dim, value_dim, length_dim)
char *name, *value; int *length;
int name_dim, value_dim, length_dim;
{
static char *prefix = "PGPLOT_"; /* Environment variable name prefix */
char test[33]; /* PGPLOT_* Concatenation buffer */
int name_len; /* Un-padded length of 'name' string */
int prefix_len; /* The length of prefix[] */
char *env=0; /* Environment variable value */
int i;
/*
* Determine the length of 'name' by searching for the last
* non-space character.
*/
name_len = name_dim;
while(name_len > 0 && name[name_len-1] == ' ')
name_len--;
/*
* Determine the length of the prefix.
*/
prefix_len = strlen(prefix);
/*
* Prefix 'name' with PGPLOT_ if there is room in test[].
*/
if(prefix_len + name_len + 1 <= sizeof(test)/sizeof(char)) {
strcpy(test, prefix);
strncpy(&test[prefix_len], name, name_len);
test[prefix_len+name_len] = '\0';
/*
* Get the value of the environment variable now named in test[].
*/
env = getenv(test);
};
/*
* Substitute an empty string if no value was obtained, or the value
* obtained is too long to fit in the output string.
*/
if(env==0 || strlen(env) > value_dim)
env = "";
/*
* Copy the environment variable value into the output string.
*/
strncpy(value, env, value_dim);
/*
* Return the unpadded length of the string.
*/
{
int env_len = strlen(env);
*length = (env_len <= value_dim) ? env_len : value_dim;
};
/*
* Pad the fortran string with spaces.
*/
for(i = *length; i<value_dim; i++)
value[i] = ' ';
return;
}
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