* Added the primitive (environ):

returns an alist of (string x string) as obtained from the
    system environ.
* Added the primitive env:
  (env "key") retrieves the env value associated with key
  (env "key" "val") sets the env value assocuated with key to val
  (env "key" "val" overwrite?) same as above but it does not
  overwrite an existing value of overwrite? is #f.

bin/ikarus-runtime.c

@@ -18,6 +18,9 @@
 
 int total_allocated_pages = 0;
          
+extern char **environ;
+
+
 #define segment_size  (pagesize*pagesize/wordsize)
 #define segment_shift (pageshift+pageshift-wordshift)
 #define segment_index(x) (((unsigned int)(x)) >> segment_shift)
@@ -918,3 +921,51 @@ ikrt_waitpid(ikp pid){
   pid_t t = waitpid(unfix(pid), &status, 0);
   return fix(status);
 }
+
+ikp 
+ikrt_getenv(ikp str, ikpcb* pcb){
+  char* v = getenv(string_data(str));
+  if(v){
+    int n = strlen(v);
+    ikp s = ik_alloc(pcb, align(n+disp_string_data+1)) + string_tag;
+    ref(s, -string_tag) = fix(n);
+    memcpy(s+off_string_data, v, n+1);
+    return s;
+  } 
+  else {
+    ikp s = ik_alloc(pcb, align(disp_string_data+1)) + string_tag;
+    ref(s, -string_tag) = fix(0);
+    ref(s, off_string_data) = 0;
+    return s;
+  }
+}
+
+ikp 
+ikrt_setenv(ikp key, ikp val, ikp overwrite){
+  int err = setenv(string_data(key), string_data(val), 
+                   overwrite!=false_object);
+  if(err){
+    return false_object;
+  } else {
+    return true_object;
+  }
+}
+
+
+ikp 
+ikrt_environ(ikpcb* pcb){
+  char** es = environ;
+  int i; char* e;
+  ikp ac = null_object;
+  for(i=0; (e=es[i]); i++){
+    int n = strlen(e);
+    ikp s = ik_alloc(pcb, align(n+disp_string_data+1)) + string_tag;
+    ref(s, -string_tag) = fix(n);
+    memcpy(s+off_string_data, e, n+1);
+    ikp p = ik_alloc(pcb, pair_size) + pair_tag;
+    ref(p, off_cdr) = ac;
+    ref(p, off_car) = s;
+    ac = p;
+  }
+  return ac;
+}

src/libposix.ss

@@ -69,6 +69,35 @@
                   [else "Unknown error while deleting ~s"])
                 x)]))))
 
+(primitive-set! 'env
+  (let ()
+    (define env
+      (case-lambda
+        [(key) 
+         (if (string? key)
+             (foreign-call "ikrt_getenv" key)
+             (error 'env "the key: ~s is not a string" key))]
+        [(key val) (env key val #t)]
+        [(key val overwrite?)
+         (if (string? key)
+             (if (string? val)
+                 (unless (foreign-call "ikrt_setenv" key val overwrite?)
+                   (error 'env "failed to set ~s to ~s" key val))
+                 (error 'env "the value: ~s is not a string" val))
+             (error 'env "the key: ~s is not a string" key))]))
+    env))
 
-
-
+(primitive-set! 'environ
+  (lambda ()
+    (map 
+      (lambda (s)
+        (define (loc= s i n)
+          (cond
+            [(fx= i n) i]
+            [(char=? (string-ref s i) #\=) i]
+            [else (loc= s (fx+ i 1) n)]))
+        (let ([n (string-length s)])
+          (let ([i (loc= s 0 n)])
+            (cons (substring s 0 i)
+                  (substring s (fxadd1 i) n)))))
+      (foreign-call "ikrt_environ"))))

src/makefile.ss

@@ -86,7 +86,7 @@
     make-guardian weak-cons collect 
     interrupt-handler
     time-it 
-    posix-fork fork waitpid
+    posix-fork fork waitpid env environ
     ))
 
 (define system-primitives
@@ -266,7 +266,7 @@
         (when (eq? who (caddr x))
           (compile-library (car x) (cadr x))))
       scheme-library-files))
- ; (define (time x) x)
+  (define (time x) x)
   (fork
     (lambda (pid) 
       (time (compile-all 'p1))