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#ident "@(#)environ.c 1.9 93/06/28 SMI"
/*
* (c) Copyright 1989 Sun Microsystems, Inc.
*/
/*
* Sun design patents pending in the U.S. and foreign countries. See
* LEGAL_NOTICE file for terms of the license.
*/
#include <stdio.h>
#ifdef SYSV
#include <string.h>
#else
#include <strings.h>
extern char *strrchr();
extern char *strchr();
#endif
#include <X11/Xos.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include "mem.h"
extern char **environ;
/* -----------------------------------------------------------------------
* Local Data Structures
* -----------------------------------------------------------------------*/
/*
* Env - environment object
*/
typedef struct _env {
char **environ; /* array of environment strings */
int length; /* length of environ array */
int used; /* number of entries actually used */
} Env;
/* -----------------------------------------------------------------------
* Local Functions
* -----------------------------------------------------------------------*/
/*
* createEnv - Creates a new environment array that is the length of
* of the current environment plus the number of additions.
*/
static void
createEnv(env,nadditions)
Env *env;
int nadditions;
{
int i = 0;
/* find the number of items in the current environ */
while (environ[i] != (char *)NULL) {
i++;
}
/* create space for the environ strings */
env->used = i;
env->length = env->used + nadditions + 1;
env->environ = MemAlloc(env->length*sizeof(char *));
/* copy the current environ into the new one */
for (i=0; i<env->used; i++) {
env->environ[i] = MemNewString(environ[i]);
}
env->environ[i] = (char *)NULL;
}
/*
* putEnv - Puts the name,value pair into the specified environment
* replacing any existing values.
* Assumes there is space for the new setting.
*/
static void
putEnv(env,name,value)
Env *env;
char *name;
char *value;
{
int nameLen = strlen(name);
char *envVar;
int count;
/* create new env string with space for '=' and null */
envVar = (char *)MemAlloc(nameLen + strlen(value) +2);
(void)sprintf(envVar,"%s=%s",name,value);
/* search through, checking for variable in question */
for (count=0 ; count<env->used; count++) {
if (!strncmp(env->environ[count],name,nameLen))
break;
}
if (count == env->used) /* finished loop without match */
env->used++; /* added 1 more var to the env */
else
MemFree(env->environ[count]); /* don't need */
env->environ[count] = envVar;
/* make sure the last entry in the vector is NULL */
env->environ[env->used] = (char *)NULL;
}
/*
* putDisplayEnv - sets the DISPLAY env to the appropriate screen
*/
static void
putDisplayEnv(env,dpy,screen)
Env *env;
Display *dpy;
int screen;
{
char *display = DisplayString(dpy);
char *colon,*dot;
char value[128];
int len;
if ((colon = strrchr(display,':')) == (char *)NULL) {
return;
}
if ((dot = strchr(colon,'.')) != (char *)NULL) {
len = dot - display;
} else {
len = colon - display;
}
(void)sprintf(value,"%*s.%d",len,display,screen);
putEnv(env,"DISPLAY",value);
}
#ifndef NOSVENV
/*
* putSunViewEnv - sets the various SV environment variables
*/
static void
putSunViewEnv(env,dpy,screen)
Env *env;
Display *dpy;
int screen;
{
static char *svEnv[] = { "WINDOW_PARENT",
"WMGR_ENV_PLACEHOLDER",
"WINDOW_TTYPARMS" };
int i, svEnvLen = sizeof(svEnv)/sizeof(char *);
char *result,*curpos;
unsigned long nitems,remainder;
extern void *GetWindowProperty();
extern Atom AtomSunViewEnv;
result = (char *)GetWindowProperty(dpy,RootWindow(dpy,screen),
AtomSunViewEnv,0L,100000L,
XA_STRING,8,&nitems,&remainder);
if (result == NULL)
return;
curpos = result;
for (i=0; i<svEnvLen; i++) {
putEnv(env,svEnv[i],curpos);
curpos += strlen(curpos) + 1;
}
XFree((char *)result);
}
#endif /* NOSVENV */
/* -----------------------------------------------------------------------
* Global Functions
* -----------------------------------------------------------------------*/
/*
* MakeEnviron - returns a new environment array that contains the
* current environ plus a modified DISPLAY and
* SunView environment variables.
*/
char **
MakeEnviron(dpy,screen)
Display *dpy;
int screen;
{
Env newEnv;
int nadditions;
nadditions = 1; /* for DISPLAY */
#ifndef NOSVENV
nadditions += 3; /* for SV environment */
#endif /* NOSVENV */
createEnv(&newEnv,nadditions);
putDisplayEnv(&newEnv,dpy,screen);
#ifndef NOSVENV
putSunViewEnv(&newEnv,dpy,screen);
#endif /* NOSVENV */
return newEnv.environ;
}
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