From ec306ef31fdf4af6eb6951bb2bbc4c37c7eadc3d Mon Sep 17 00:00:00 2001
From: Jesse McDonald <nybble41@gmail.com>
Date: Sun, 22 Nov 2009 22:41:27 -0600
Subject: [PATCH] Adjust indirect form (#i"path") to be relative to the current
 file.

---
 reader.c  | 48 ++++++++++++++++++++++++++++++++------
 reader.h  |  5 +++-
 rosella.c | 70 ++++++++++++++++++++++++++-----------------------------
 3 files changed, 78 insertions(+), 45 deletions(-)

diff --git a/reader.c b/reader.c
index 25db31a..23a43fa 100644
--- a/reader.c
+++ b/reader.c
@@ -1,3 +1,10 @@
+#define _XOPEN_SOURCE 500
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
 #include <ctype.h>
 #include <inttypes.h>
 #include <stdbool.h>
@@ -47,7 +54,7 @@ static value_t patch_placeholders(reader_state_t *state, value_t v);
 
 static void tree_replace(value_t *in, value_t oldval, value_t newval);
 
-value_t read_value(FILE *f)
+value_t read_value_from_file(FILE *f)
 {
   reader_state_t state;
   value_t result;
@@ -72,6 +79,38 @@ value_t read_value(FILE *f)
   return result;
 }
 
+value_t read_value_from_path(const char *path)
+{
+  FILE *f = fopen(path, "r");
+  const char *last_slash;
+  value_t v;
+  int dirfd;
+
+  release_assert(f != NULL);
+
+  dirfd = open(".", O_RDONLY);
+  release_assert(dirfd >= 0);
+
+  last_slash = strrchr(path, '/');
+
+  if (last_slash)
+  {
+    size_t bytes = last_slash - path;
+    char *dirname = (char*)malloc(bytes+1);
+    memcpy(dirname, path, bytes);
+    dirname[bytes] = '\0';
+    chdir(dirname);
+  }
+
+  v = read_value_from_file(f);
+  fchdir(dirfd);
+  close(dirfd);
+
+  fclose(f);
+
+  return v;
+}
+
 static value_t read_one_value(reader_state_t *state)
 {
   skip_whitespace(state);
@@ -676,13 +715,8 @@ static value_t read_placeholder(reader_state_t *state)
 static value_t read_indirect(value_t path)
 {
   char *name = value_to_string(path);
-  FILE *f = fopen(name, "r");
-  value_t v;
+  value_t v = read_value_from_path(name);
   free(name);
-
-  release_assert(f != NULL);
-  v = read_value(f);
-  fclose(f);
   return v;
 }
 
diff --git a/reader.h b/reader.h
index 3acf57e..751cf61 100644
--- a/reader.h
+++ b/reader.h
@@ -1,9 +1,12 @@
 #ifndef READER_H_bc8f9bf546e3914a72851703b38326d2
 #define READER_H_bc8f9bf546e3914a72851703b38326d2
 
+#include <stdio.h>
+
 #include "gc.h"
 
-value_t read_value(FILE *f);
+value_t read_value_from_file(FILE *f);
+value_t read_value_from_path(const char *path);
 
 #endif
 /* vim:set sw=2 expandtab: */
diff --git a/rosella.c b/rosella.c
index dced4b4..c14393c 100644
--- a/rosella.c
+++ b/rosella.c
@@ -37,56 +37,52 @@ int main(int argc, char **argv)
   interpreter_init();
   io_builtin_init();
 
-  if (argc < 2 || (strcmp(argv[1], "-k") == 0))
+  if (argc < 2 || (strcmp(argv[1], "-t") == 0) || (strcmp(argv[1], "--test") == 0))
   {
     test_builtins();
     test_weak_boxes_and_wills();
-    if (argc > 1)
-      test_reader();
-    test_garbage_collection(argc > 1);
+    test_garbage_collection(false);
+  }
+  else if ((strcmp(argv[1], "-b") == 0) || (strcmp(argv[1], "--burn-in") == 0))
+  {
+    test_garbage_collection(true);
+  }
+  else if ((strcmp(argv[1], "-r") == 0) || (strcmp(argv[1], "--reader") == 0))
+  {
+    test_reader();
   }
   else
   {
-    FILE *f = fopen(argv[1], "r");
+    gc_root_t argv_root;
+    value_t program;
+    value_t results;
 
-    if (f)
+    register_gc_root(&argv_root, NIL);
+
+    /* Construct list backward, so that we don't have to reverse it. */
+    for (int i = argc - 1; i >= 2; --i)
     {
-      gc_root_t argv_root;
-      value_t program;
-      value_t results;
+      value_t temp = string_to_value(argv[i]);
+      argv_root.value = cons(temp, argv_root.value);
+    }
+    
+    program = read_value_from_path(argv[1]);
 
-      register_gc_root(&argv_root, NIL);
+    unregister_gc_root(&argv_root);
+    results = run_interpreter(program, argv_root.value);
 
-      /* Construct list backward, so that we don't have to reverse it. */
-      for (int i = argc - 1; i >= 2; --i)
-      {
-        value_t temp = string_to_value(argv[i]);
-        argv_root.value = cons(temp, argv_root.value);
-      }
-      
-      program = read_value(f);
-      fclose(f);
-
-      unregister_gc_root(&argv_root);
-      results = run_interpreter(program, argv_root.value);
-
-      for (value_t result = results; !is_nil(result); result = _CDR(result))
-      {
-        print_value(CAR(result));
-        nl();
-      }
+    for (value_t result = results; !is_nil(result); result = _CDR(result))
+    {
+      print_value(CAR(result));
+      nl();
+    }
 
 #if 0
-      nl();
-      fflush(stdout);
+    nl();
+    fflush(stdout);
 
-      fprint_gc_stats(stderr);
+    fprint_gc_stats(stderr);
 #endif
-    }
-    else
-    {
-      perror(argv[1]);
-    }
   }
 
   return 0;
@@ -206,7 +202,7 @@ static void test_reader(void)
     fputs("> ", stdout);
     fflush(stdout);
 
-    v = read_value(stdin);
+    v = read_value_from_file(stdin);
 
     print_value(v); nl();
     nl();