windows works again and also alists working now

src/built_ins.cpp

@@ -923,7 +923,7 @@ proc load_built_ins_into_environment(Environment* env) -> void {
             try evaluated_arguments = eval_arguments(arguments, env, &arguments_length);
             try assert_arguments_length(1, arguments_length);
 
-            return Memory::create_lisp_object_number((u64)&(evaluated_arguments->value.pair.first->value));
+            return Memory::create_lisp_object_number((float)((u64)&(evaluated_arguments->value.pair.first->value)));
         });
     defun("generate-docs", "TODO", __LINE__, cLambda {
             try arguments_length = list_length(arguments);

src/docgeneration.cpp

@@ -1,15 +1,15 @@
 proc generate_docs(Environment* env, String* path) -> void {
     // save the current working directory
-    char cwd[1024];
-    getcwd(cwd, 1024);
+    char* cwd = get_cwd();
     // get the direction of the exe
     char* exe_path = exe_dir();
-    chdir(exe_path);
-    free(exe_path);
+    change_cwd(exe_path);
 
     defer {
         // switch back to the users directory
-        chdir(cwd);
+        change_cwd(cwd);
+        free(exe_path);
+        free(cwd);
     };
 
     FILE *f = fopen(Memory::get_c_str(path), "w");

src/io.cpp

@@ -388,63 +388,103 @@ proc log_error() -> void {
 }
 
 proc exe_dir() -> char* {
-    size_t  size = 512, i, n;
-    char   *path, *temp;
+    if_linux {
+        size_t  size = 512, i, n;
+        char   *path, *temp;
 
-    while (1) {
-        ssize_t  used;
+        while (1) {
+            size_t  used;
 
-        path = (char*)malloc(size);
+            path = (char*)malloc(size);
+            if (!path) {
+                errno = ENOMEM;
+                return NULL;
+            }
+
+            used = readlink("/proc/self/exe", path, size);
+
+            if (used == -1) {
+                const int saved_errno = errno;
+                free(path);
+                errno = saved_errno;
+                return NULL;
+            } else
+                if (used < 1) {
+                    free(path);
+                    errno = EIO;
+                    return NULL;
+                }
+
+            if ((size_t)used >= size) {
+                free(path);
+                size = (size | 2047) + 2049;
+                continue;
+            }
+
+            size = (size_t)used;
+            break;
+        }
+
+        /* Find final slash. */
+        n = 0;
+        for (i = 0; i < size; i++)
+            if (path[i] == '/')
+                n = i;
+
+        /* Optimize allocated size,
+           ensuring there is room for
+           a final slash and a
+           string-terminating '\0', */
+        temp = path;
+        path = (char*)realloc(temp, n + 2);
         if (!path) {
+            free(temp);
             errno = ENOMEM;
             return NULL;
         }
 
-        used = readlink("/proc/self/exe", path, size);
+        /* and properly trim and terminate the path string. */
+        path[n+0] = '/';
+        path[n+1] = '\0';
 
-        if (used == -1) {
-            const int saved_errno = errno;
-            free(path);
-            errno = saved_errno;
-            return NULL;
-        } else
-            if (used < 1) {
+        return path;
+    }
+
+    if_windows {
+        DWORD last_error;
+        DWORD result;
+        DWORD path_size = 1024;
+        char* path      = (char*)malloc(1024);
+
+        while (true) {
+            memset(path, 0, path_size);
+            result     = GetModuleFileName(0, path, path_size - 1);
+            last_error = GetLastError();
+
+            if (0 == result) {
                 free(path);
-                errno = EIO;
-                return NULL;
+                path = 0;
+                break;
             }
-
-        if ((size_t)used >= size) {
-            free(path);
-            size = (size | 2047) + 2049;
-            continue;
+            else if (result == path_size - 1) {
+                free(path);
+                /* May need to also check for ERROR_SUCCESS here if XP/2K */
+                if (ERROR_INSUFFICIENT_BUFFER != last_error) {
+                    path = 0;
+                    break;
+                }
+                path_size = path_size * 2;
+                path = (char*)malloc(path_size);
+            }
+            else
+                break;
         }
 
-        size = (size_t)used;
-        break;
+        if (!path) {
+            fprintf(stderr, "Failure: %d\n", last_error);
+            return "";
+        }
+        else
+            return path;
     }
-
-    /* Find final slash. */
-    n = 0;
-    for (i = 0; i < size; i++)
-        if (path[i] == '/')
-            n = i;
-
-    /* Optimize allocated size,
-       ensuring there is room for
-       a final slash and a
-       string-terminating '\0', */
-    temp = path;
-    path = (char*)realloc(temp, n + 2);
-    if (!path) {
-        free(temp);
-        errno = ENOMEM;
-        return NULL;
-    }
-
-    /* and properly trim and terminate the path string. */
-    path[n+0] = '/';
-    path[n+1] = '\0';
-
-    return path;
 }

src/memory.cpp

@@ -357,17 +357,19 @@ namespace Memory {
         Parser::environment_for_macros = ret;
 
         // save the current working directory
-        char cwd[1024];
-        getcwd(cwd, 1024);
+        char* cwd = get_cwd();
+        defer {
+            free(cwd);
+        };
 
         // get the direction of the exe
         char* exe_path = exe_dir();
-        chdir(exe_path);
+        change_cwd(exe_path);
         free(exe_path);
 
         built_in_load(Memory::create_string("pre.slime"), ret);
 
-        chdir(cwd);
+        change_cwd(cwd);
 
         return ret;
     }

src/platform.cpp

@@ -0,0 +1,23 @@
+inline proc get_cwd() -> char* {
+    const int buf_size = 2048;
+    char* res = (char*)malloc(buf_size * sizeof(char));
+
+    if_linux {
+        getcwd(res, buf_size);
+    }
+    if_windows {
+        _getcwd(res, buf_size);
+    }
+
+    return res;
+}
+
+inline proc change_cwd(char* dir) -> void {
+    if_linux {
+        chdir(dir);
+    }
+
+    if_windows {
+        _chdir(dir);
+    }
+}

src/slime.h

@@ -3,7 +3,14 @@
 #define _CRT_SECURE_NO_WARNINGS
 #define _CRT_SECURE_NO_DEPRECATE
 #include <stdlib.h>
-#include <unistd.h>
+
+#if defined(WIN32) || defined(_WIN32) || defined(__WIN32) && !defined(__CYGWIN__)
+#  include <direct.h>
+#  include <windows.h>
+size_t readlink(char*, char*, size_t);
+#else
+#  include <unistd.h>
+#endif
 #include <stdio.h>
 #include <time.h>
 #include <string.h>
@@ -19,6 +26,7 @@ namespace Slime {
 #    include "./defines.cpp"
 #    include "./structs.cpp"
 #    include "./forward_decls.cpp"
+#    include "./platform.cpp"
 #    include "./memory.cpp"
 #    include "./lisp_object.cpp"
 #    include "./error.cpp"

src/testing.cpp

@@ -596,7 +596,7 @@ proc run_all_tests() -> bool {
     char* exe_path = exe_dir();
 
     // switch to the exe directory for loading pre.slime
-    chdir(exe_path);
+    change_cwd(exe_path);
     free(exe_path);
 
     bool result = true;

src/visualization.cpp

@@ -1,17 +1,18 @@
 proc visualize_lisp_machine() -> void {
 
     // save the current working directory
-    char cwd[1024];
-    getcwd(cwd, 1024);
+    char* cwd = get_cwd();
+
     // get the direction of the exe
     char* exe_path = exe_dir();
     // switch to the exe directory for loading pre.slime
-    chdir(exe_path);
+    change_cwd(exe_path);
     free(exe_path);
 
     defer {
         // switch back to the users directory
-        chdir(cwd);
+        change_cwd(cwd);
+        free(cwd);
     };
 
     struct Drawn_Area {
@@ -180,7 +181,7 @@ proc visualize_lisp_machine() -> void {
         case Lisp_Object_Type::T:       return draw_text("t");
         case Lisp_Object_Type::Nil:     return draw_text("()");
         case Lisp_Object_Type::Pair:    return draw_pair(obj);
-        case Lisp_Object_Type::Number:  return draw_float(obj->value.number);
+        case Lisp_Object_Type::Number:  return draw_float((float)obj->value.number);
         case Lisp_Object_Type::Symbol:  return draw_text(&obj->value.string->data);
         case Lisp_Object_Type::Keyword: {
             Drawn_Area colon =  draw_text(":", "#c61b6e");
@@ -303,7 +304,7 @@ proc visualize_lisp_machine() -> void {
         // -------------------
         draw_new_line();
 
-        int free_string_memory = Memory::next_free_spot_in_string_memory - Memory::string_memory;
+        int free_string_memory = (int)(Memory::next_free_spot_in_string_memory - Memory::string_memory);
         for (int i = 0; i < Memory::free_spots_in_string_memory->next_index; ++i) {
             free_string_memory += ((String*)(Memory::free_spots_in_string_memory->data[i]))->length;
         }
@@ -491,7 +492,7 @@ proc visualize_lisp_machine() -> void {
             draw_new_line();
             write_x = start_x + 600;
 
-            draw_float(numbers->data[i]->value.number);
+            draw_float((float)(numbers->data[i]->value.number));
         }
 
         write_x = start_x + 900;