at great pains, the stubber can generate (ugly) code for getcwd

include/chibi/sexp.h

@@ -823,11 +823,9 @@ SEXP_API sexp sexp_register_simple_type (sexp ctx, sexp name, sexp slots);
 SEXP_API sexp sexp_register_c_type (sexp ctx, sexp name);
 SEXP_API sexp sexp_finalize_c_type (sexp ctx, sexp obj);
 #define sexp_register_c_type(ctx, name, finalizer)                      \
-  sexp_register_type(ctx, name, sexp_make_fixnum(0), sexp_make_fixnum(0), \
-                     sexp_make_fixnum(0), sexp_make_fixnum(0),          \
-                     sexp_make_fixnum(0),                               \
-                     sexp_make_fixnum(sexp_sizeof(cpointer)),           \
-                     sexp_make_fixnum(0), sexp_make_fixnum(0), finalizer)
+  sexp_register_type(ctx, name, SEXP_ZERO, SEXP_ZERO, SEXP_ZERO, SEXP_ZERO, \
+                     SEXP_ZERO, sexp_make_fixnum(sexp_sizeof(cpointer)), \
+                     SEXP_ZERO, SEXP_ZERO, finalizer)
 #endif
 
 #define sexp_current_error_port(ctx) sexp_env_global_ref(sexp_context_env(ctx),sexp_global(ctx,SEXP_G_CUR_ERR_SYMBOL),SEXP_FALSE)

lib/chibi/posix.module

@@ -4,7 +4,7 @@
           delete-file link-file symbolic-link-file rename-file
           directory-files create-directory delete-directory
           current-seconds
-          exit
+          waitpid exit
           )
   (import-immutable (scheme))
   (include-shared "posix")

lib/chibi/posix.stub

@@ -1,5 +1,6 @@
 
 (c-system-include "sys/types.h")
+(c-system-include "sys/wait.h")
 (c-system-include "time.h")
 (c-system-include "unistd.h")
 (c-system-include "dirent.h")
@@ -18,7 +19,8 @@
 (define-c errno (symbolic-link-file "symlink") (string string))
 (define-c errno (rename-file "rename") (string string))
 
-;;(define-c string (current-directory "getcwd") ((value (array char)) int))
+(define-c non-null-string (current-directory "getcwd")
+  ((result (array char (auto-expand arg1))) (value 256 int)))
 (define-c errno (create-directory "mkdir") (string int))
 (define-c errno (delete-directory "rmdir") (string))
 
@@ -28,9 +30,9 @@
 (define-c int (duplicate-fd "dup") (int))
 
 (define-c pid_t fork ())
-;; (define-c pid_t wait ((result pointer int)))
+(define-c pid_t waitpid (int (result int) int))
 (define-c void exit (int))
-(define-c int (execute execvp) (string (array string null)))
+(define-c int (execute execvp) (string (array string)))
 
 (define-c errno pipe ((result (array int 2))))
 

sexp.c

@@ -837,8 +837,12 @@ sexp sexp_get_output_string (sexp ctx, sexp port) {
 #else
 
 sexp sexp_make_input_string_port (sexp ctx, sexp str) {
-  FILE *in = fmemopen(sexp_string_data(str), sexp_string_length(str), "r");
-  sexp res = sexp_make_input_port(ctx, in, SEXP_FALSE);
+  FILE *in;
+  sexp res;
+  if (! sexp_stringp(str))
+    return sexp_type_exception(ctx, "open-input-string: not a string", str);
+  in = fmemopen(sexp_string_data(str), sexp_string_length(str), "r");
+  res = sexp_make_input_port(ctx, in, SEXP_FALSE);
   sexp_port_cookie(res) = str;  /* for gc preservation */
   return res;
 }
@@ -916,7 +920,10 @@ sexp sexp_buffered_flush (sexp ctx, sexp p) {
 }
 
 sexp sexp_make_input_string_port (sexp ctx, sexp str) {
-  sexp res = sexp_make_input_port(ctx, NULL, SEXP_FALSE);
+  sexp res;
+  if (! sexp_stringp(str))
+    return sexp_type_exception(ctx, "open-input-string: not a string", str);
+  res = sexp_make_input_port(ctx, NULL, SEXP_FALSE);
   if (sexp_exceptionp(res)) return res;
   sexp_port_cookie(res) = str;
   sexp_port_buf(res) = sexp_string_data(str);