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#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <arpa/telnet.h>
#include "ring.h"
#include "defines.h"
#include "externs.h"
#include "environ.h"
#include "array.h"
class enviro {
protected:
char *var; /* pointer to variable name */
char *value; /* pointer to variable's value */
int doexport; /* 1 -> export with default list of variables */
void clean() { if (var) delete []var; if (value) delete []value; }
public:
enviro() { var = value = NULL; doexport = 0; }
~enviro() { clean(); }
const char *getname() const { return var; }
const char *getval() const { return value; }
void define(const char *vr, const char *vl) {
clean();
var = strcpy(new char[strlen(vr)+1], vr);
value = strcpy(new char[strlen(vl)+1], vl);
}
void clear() { clean(); var = value = NULL; }
void export(int ex) { doexport = ex; }
int getexport() const { return doexport; }
};
static array<enviro> vars;
static enviro *env_find(const char *var) {
for (int i=0; i<vars.num(); i++) {
if (!strcmp(vars[i].getname(), var))
return &vars[i];
}
return NULL;
}
static void env_put(const char *var, const char *val, int exp) {
enviro *ep = env_find(var);
if (!ep) {
int x = vars.num();
vars.setsize(x+1);
ep = &vars[x];
}
ep->define(var, val);
ep->export(exp);
}
static void env_copy(void) {
extern char **environ;
char *s;
int i;
for (i=0; environ[i]; i++) {
s = strchr(environ[i], '=');
if (s) {
*s=0;
env_put(environ[i], s+1, 0);
*s='=';
}
}
}
/*
* Special case for DISPLAY variable. If it is ":0.0" or
* "unix:0.0", we have to get rid of "unix" and insert our
* hostname.
*/
static void env_fix_display(void) {
enviro *ep = env_find("DISPLAY");
if (!ep) return;
ep->export(1);
if (strncmp(ep->getval(), ":", 1) && strncmp(ep->getval(), "unix:", 5)) {
return;
}
char hbuf[256];
const char *cp2 = strrchr(ep->getval(), ':');
int maxlen = sizeof(hbuf)-strlen(cp2)-1;
gethostname(hbuf, maxlen);
hbuf[maxlen] = 0; /* ensure null termination */
/*
* dholland 7/30/96 if not a FQDN ask DNS
*/
if (!strchr(hbuf, '.')) {
struct hostent *h = gethostbyname(hbuf);
if (h) {
strncpy(hbuf, h->h_name, maxlen);
hbuf[maxlen] = 0; /* ensure null termination */
}
}
strcat(hbuf, cp2);
ep->define("DISPLAY", hbuf);
}
/*********************************************** interface ***********/
void env_init(void) {
env_copy();
env_fix_display();
/*
* If USER is not defined, but LOGNAME is, then add
* USER with the value from LOGNAME. By default, we
* don't export the USER variable.
*/
if (!env_find("USER")) {
enviro *ep = env_find("LOGNAME");
if (ep) env_put("USER", ep->getval(), 0);
}
enviro *ep = env_find("PRINTER");
if (ep) ep->export(1);
}
void env_define(const char *var, const char *value) {
env_put(var, value, 1);
}
void env_undefine(const char *var) {
enviro *ep = env_find(var);
if (ep) {
/*
* We don't make any effort to reuse cleared environment spaces.
* It's highly unlikely to be worth the trouble.
*/
ep->clear();
}
}
void env_export(const char *var) {
enviro *ep = env_find(var);
if (ep) ep->export(1);
}
void env_unexport(const char *var) {
enviro *ep = env_find(var);
if (ep) ep->export(1);
}
void env_send(const char *var) {
if (my_state_is_wont(TELOPT_ENVIRON)) {
fprintf(stderr, "Cannot send '%s': Telnet ENVIRON option disabled\n",
var);
return;
}
enviro *ep = env_find(var);
if (!ep) {
fprintf(stderr, "Cannot send '%s': variable not defined\n", var);
return;
}
env_opt_start_info();
env_opt_add(ep->getname());
env_opt_end(0);
}
void env_list(void) {
for (int i=0; i<vars.num(); i++) {
printf("%c %-20s %s\n", vars[i].getexport() ? '*' : ' ',
vars[i].getname(), vars[i].getval());
}
}
void env_iterate(int *iter, int /*exported_only*/) {
*iter = 0;
}
const char *env_next(int *iter, int exported_only) {
while (*iter>=0 && *iter<vars.num()) {
int k = (*iter)++;
if (vars[k].getexport() || !exported_only) {
return vars[k].getname();
}
}
return NULL;
}
const char *env_getvalue(const char *var) {
enviro *ep = env_find(var);
if (ep) return ep->getval();
return NULL;
}
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