mkxp-freebird/binding-mruby/mrb-ext/file.cpp

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/*
** file.cpp
**
** This file is part of mkxp.
**
** Copyright (C) 2013 Jonas Kulla <Nyocurio@gmail.com>
**
** mkxp is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 2 of the License, or
** (at your option) any later version.
**
** mkxp is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with mkxp. If not, see <http://www.gnu.org/licenses/>.
*/
#include "file.h"
#include "debugwriter.h"
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#include "../binding-util.h"
#include <mruby/string.h>
#include <mruby/array.h>
#include <mruby/class.h>
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#include <SDL_rwops.h>
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#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <libgen.h>
#include <sys/stat.h>
#include <vector>
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extern mrb_value timeFromSecondsInt(mrb_state *mrb, time_t seconds);
static void
checkValid(mrb_state *mrb, FileImpl *p, int rwMode = FileImpl::ReadWrite)
{
MrbData *data = getMrbData(mrb);
if (p->closed)
mrb_raise(mrb, data->exc[IO], "closed stream");
if (!(p->mode & rwMode))
{
const char *errorMsg = 0;
switch (rwMode)
{
case FileImpl::Read :
errorMsg = "not openend for reading"; break;
case FileImpl::Write :
errorMsg = "not openend for writing"; break;
default: break;
}
mrb_raise(mrb, data->exc[IO], errorMsg);
}
}
extern const mrb_data_type FileType =
{
"File",
freeInstance<FileImpl>
};
static int
getOpenMode(const char *mode)
{
#define STR_CASE(cs, ret) else if (!strcmp(mode, cs)) { return FileImpl:: ret; }
if (!strcmp(mode, "r"))
return FileImpl::Read;
STR_CASE("rb", Read)
STR_CASE("r+", ReadWrite)
STR_CASE("w", Write)
STR_CASE("wb", Write)
STR_CASE("w+", ReadWrite)
STR_CASE("rw", ReadWrite)
STR_CASE("a", Write)
STR_CASE("a+", ReadWrite)
Debug() << "getOpenMode failed for:" << mode;
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return 0;
}
static void handleErrno(mrb_state *mrb)
{
MrbException exc;
const char *msg;
mrb_value arg1;
#define ENO(_eno, _msg) \
case _eno: { exc = Errno##_eno; msg = _msg; break; }
switch (errno)
{
ENO(EACCES, "");
ENO(EBADF, "");
ENO(EEXIST, "");
ENO(EINVAL, "");
ENO(EMFILE, "");
ENO(ENOMEM, "");
ENO(ERANGE, "");
default:
exc = IO; msg = "Unknown Errno: %S";
arg1 = mrb_any_to_s(mrb, mrb_fixnum_value(errno));
}
#undef ENO
mrb_raisef(mrb, getMrbData(mrb)->exc[exc], msg, arg1);
}
#define GUARD_ERRNO(stmnt) \
{ \
errno = 0; \
{ stmnt } \
if (errno != 0) \
handleErrno(mrb); \
}
static char *
findLastDot(char *str)
{
char *find = 0;
char *ptr = str;
/* Dot in front is not considered */
if (*ptr == '.')
ptr++;
for (; *ptr; ++ptr)
{
/* Dot in dirpath is not considered */
if (*ptr == '/')
{
ptr++;
if (*ptr == '.')
ptr++;
}
if (*ptr == '.')
find = ptr;
}
return find;
}
/* File class methods */
MRB_FUNCTION(fileBasename)
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{
mrb_value filename;
const char *suffix = 0;
mrb_get_args(mrb, "S|z", &filename, &suffix);
char *_filename = RSTRING_PTR(filename);
char *base = basename(_filename);
char *ext = 0;
if (suffix)
{
ext = findLastDot(base);
if (ext && !strcmp(ext, suffix))
*ext = '\0';
}
mrb_value str = mrb_str_new_cstr(mrb, base);
/* Restore param string */
if (ext)
*ext = '.';
return str;
}
MRB_FUNCTION(fileDelete)
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{
mrb_int argc;
mrb_value *argv;
mrb_get_args(mrb, "*", &argv, &argc);
for (int i = 0; i < argc; ++i)
{
mrb_value &v = argv[i];
if (!mrb_string_p(v))
continue;
const char *filename = RSTRING_PTR(v);
GUARD_ERRNO( unlink(filename); )
}
return mrb_nil_value();
}
MRB_FUNCTION(fileDirname)
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{
mrb_value filename;
mrb_get_args(mrb, "S", &filename);
char *_filename = RSTRING_PTR(filename);
char *dir = dirname(_filename);
return mrb_str_new_cstr(mrb, dir);
}
MRB_FUNCTION(fileExpandPath)
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{
const char *path;
const char *defDir = 0;
mrb_get_args(mrb, "z|z", &path, &defDir);
// FIXME No idea how to integrate 'default_dir' right now
if (defDir)
Debug() << "FIXME: File.expand_path: default_dir not implemented";
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char buffer[PATH_MAX];
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char *unused = realpath(path, buffer);
(void) unused;
return mrb_str_new_cstr(mrb, buffer);
}
MRB_FUNCTION(fileExtname)
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{
mrb_value filename;
mrb_get_args(mrb, "S", &filename);
char *ext = findLastDot(RSTRING_PTR(filename));
return mrb_str_new_cstr(mrb, ext);
}
MRB_FUNCTION(fileOpen)
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{
mrb_value path;
const char *mode = "r";
mrb_value block = mrb_nil_value();
mrb_get_args(mrb, "S|z&", &path, &mode, &block);
/* We manually check errno because we're supplying the
* filename on ENOENT */
errno = 0;
FILE *f = fopen(RSTRING_PTR(path), mode);
if (!f)
{
if (errno == ENOENT)
mrb_raisef(mrb, getMrbData(mrb)->exc[ErrnoENOENT],
"No such file or directory - %S", path);
else
handleErrno(mrb);
}
SDL_RWops *ops = SDL_RWFromFP(f, SDL_TRUE);
FileImpl *p = new FileImpl(ops, getOpenMode(mode));
mrb_value obj = wrapObject(mrb, p, FileType);
setProperty(mrb, obj, CSpath, path);
if (mrb_type(block) == MRB_TT_PROC)
{
// FIXME inquire how GC behaviour works here for obj
mrb_value ret = mrb_yield(mrb, block, obj);
p->close();
return ret;
}
return obj;
}
MRB_FUNCTION(fileRename)
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{
const char *from, *to;
mrb_get_args(mrb, "zz", &from, &to);
GUARD_ERRNO( rename(from, to); )
return mrb_fixnum_value(0);
}
MRB_FUNCTION(mrbNoop)
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{
MRB_FUN_UNUSED_PARAM;
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return mrb_nil_value();
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}
/* File instance methods */
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MRB_METHOD(fileClose)
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{
FileImpl *p = getPrivateData<FileImpl>(mrb, self);
checkValid(mrb, p);
GUARD_ERRNO( p->close(); )
return self;
}
static void
readLine(FILE *f, std::vector<char> &buffer)
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{
buffer.clear();
while (true)
{
if (feof(f))
break;
char c = fgetc(f);
if (c == '\n' || c == EOF)
break;
buffer.push_back(c);
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}
}
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MRB_METHOD(fileEachLine)
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{
FileImpl *p = getPrivateData<FileImpl>(mrb, self);
checkValid(mrb, p, FileImpl::Read);
FILE *f = p->fp();
mrb_value block;
mrb_get_args(mrb, "&", &block);
(void) f;
std::vector<char> buffer;
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mrb_value str = mrb_str_buf_new(mrb, 0);
while (feof(f) == 0)
{
GUARD_ERRNO( readLine(f, buffer); )
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if (buffer.empty() && feof(f) != 0)
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break;
size_t lineLen = buffer.size();
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mrb_str_resize(mrb, str, lineLen);
memcpy(RSTRING_PTR(str), &buffer[0], lineLen);
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mrb_yield(mrb, block, str);
}
return self;
}
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MRB_METHOD(fileEachByte)
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{
FileImpl *p = getPrivateData<FileImpl>(mrb, self);
checkValid(mrb, p, FileImpl::Read);
FILE *f = p->fp();
mrb_value block;
mrb_get_args(mrb, "&", &block);
GUARD_ERRNO(
while (feof(f) == 0)
{
mrb_int byte = fgetc(f);
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if (byte == -1)
break;
mrb_yield(mrb, block, mrb_fixnum_value(byte));
})
return self;
}
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MRB_METHOD(fileIsEof)
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{
FileImpl *p = getPrivateData<FileImpl>(mrb, self);
checkValid(mrb, p);
FILE *f = p->fp();
bool isEof;
GUARD_ERRNO( isEof = feof(f) != 0; )
return mrb_bool_value(isEof);
}
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MRB_METHOD(fileSetPos)
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{
FileImpl *p = getPrivateData<FileImpl>(mrb, self);
checkValid(mrb, p);
FILE *f = p->fp();
mrb_int pos;
mrb_get_args(mrb, "i", &pos);
GUARD_ERRNO( fseek(f, pos, SEEK_SET); )
return self;
}
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MRB_METHOD(fileGetPos)
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{
FileImpl *p = getPrivateData<FileImpl>(mrb, self);
checkValid(mrb, p);
FILE *f = p->fp();
long pos;
GUARD_ERRNO( pos = ftell(f); )
return mrb_fixnum_value(pos);
}
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MRB_METHOD(fileRead)
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{
FileImpl *p = getPrivateData<FileImpl>(mrb, self);
checkValid(mrb, p, FileImpl::Read);
FILE *f = p->fp();
long cur, size;
GUARD_ERRNO( cur = ftell(f); )
GUARD_ERRNO( fseek(f, 0, SEEK_END); )
GUARD_ERRNO( size = ftell(f); )
GUARD_ERRNO( fseek(f, cur, SEEK_SET); )
mrb_int length = size - cur;
mrb_get_args(mrb, "|i", &length);
mrb_value str = mrb_str_new(mrb, 0, 0);
mrb_str_resize(mrb, str, length);
GUARD_ERRNO( int unused = fread(RSTRING_PTR(str), 1, length, f); (void) unused; )
return str;
}
// FIXME this function always splits on newline right now,
// to make rs fully work, I'll have to use some strrstr magic I guess
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MRB_METHOD(fileReadLines)
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{
FileImpl *p = getPrivateData<FileImpl>(mrb, self);
checkValid(mrb, p, FileImpl::Read);
FILE *f = p->fp();
mrb_value arg;
mrb_get_args(mrb, "|o", &arg);
const char *rs = "\n"; (void) rs;
if (mrb->c->ci->argc > 0)
{
Debug() << "FIXME: File.readlines: rs not implemented";
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if (mrb_string_p(arg))
rs = RSTRING_PTR(arg);
else if (mrb_nil_p(arg))
rs = "\n";
else
mrb_raise(mrb, getMrbData(mrb)->exc[TypeError], "Expected string or nil"); // FIXME add "got <> instead" remark
}
mrb_value ary = mrb_ary_new(mrb);
std::vector<char> buffer;
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while (feof(f) == 0)
{
GUARD_ERRNO( readLine(f, buffer); )
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if (buffer.empty() && feof(f) != 0)
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break;
mrb_value str = mrb_str_new(mrb, &buffer[0], buffer.size());
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mrb_ary_push(mrb, ary, str);
}
return ary;
}
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MRB_METHOD(fileWrite)
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{
FileImpl *p = getPrivateData<FileImpl>(mrb, self);
checkValid(mrb, p, FileImpl::Write);
FILE *f = p->fp();
mrb_value str;
mrb_get_args(mrb, "S", &str);
size_t count;
GUARD_ERRNO( count = fwrite(RSTRING_PTR(str), 1, RSTRING_LEN(str), f); )
return mrb_fixnum_value(count);
}
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MRB_METHOD(fileGetPath)
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{
FileImpl *p = getPrivateData<FileImpl>(mrb, self);
checkValid(mrb, p);
return getProperty(mrb, self, CSpath);
}
static void
getFileStat(mrb_state *mrb, struct stat &fileStat)
{
const char *filename;
mrb_get_args(mrb, "z", &filename);
stat(filename, &fileStat);
}
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MRB_METHOD(fileGetMtime)
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{
mrb_value path = getProperty(mrb, self, CSpath);
struct stat fileStat;
stat(RSTRING_PTR(path), &fileStat);
return timeFromSecondsInt(mrb, fileStat.st_mtim.tv_sec);
}
/* FileTest module functions */
MRB_FUNCTION(fileTestDoesExist)
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{
const char *filename;
mrb_get_args(mrb, "z", &filename);
int result = access(filename, F_OK);
return mrb_bool_value(result == 0);
}
MRB_FUNCTION(fileTestIsFile)
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{
struct stat fileStat;
getFileStat(mrb, fileStat);
return mrb_bool_value(S_ISREG(fileStat.st_mode));
}
MRB_FUNCTION(fileTestIsDirectory)
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{
struct stat fileStat;
getFileStat(mrb, fileStat);
return mrb_bool_value(S_ISDIR(fileStat.st_mode));
}
MRB_FUNCTION(fileTestSize)
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{
struct stat fileStat;
getFileStat(mrb, fileStat);
return mrb_fixnum_value(fileStat.st_size);
}
void
fileBindingInit(mrb_state *mrb)
{
mrb_define_method(mrb, mrb->kernel_module, "open", fileOpen, MRB_ARGS_REQ(1) | MRB_ARGS_OPT(1) | MRB_ARGS_BLOCK());
RClass *klass = defineClass(mrb, "IO");
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klass = mrb_define_class(mrb, "File", klass);
mrb_define_class_method(mrb, klass, "basename", fileBasename, MRB_ARGS_REQ(1) | MRB_ARGS_OPT(1));
mrb_define_class_method(mrb, klass, "delete", fileDelete, MRB_ARGS_REQ(1) | MRB_ARGS_ANY());
mrb_define_class_method(mrb, klass, "dirname", fileDirname, MRB_ARGS_REQ(1));
mrb_define_class_method(mrb, klass, "expand_path", fileExpandPath, MRB_ARGS_REQ(1) | MRB_ARGS_OPT(1));
mrb_define_class_method(mrb, klass, "extname", fileExtname, MRB_ARGS_REQ(1));
mrb_define_class_method(mrb, klass, "open", fileOpen, MRB_ARGS_REQ(1) | MRB_ARGS_OPT(1) | MRB_ARGS_BLOCK());
mrb_define_class_method(mrb, klass, "rename", fileRename, MRB_ARGS_REQ(2));
/* IO */
mrb_define_method(mrb, klass, "binmode", mrbNoop, MRB_ARGS_NONE());
mrb_define_method(mrb, klass, "close", fileClose, MRB_ARGS_NONE());
mrb_define_method(mrb, klass, "each_line", fileEachLine, MRB_ARGS_BLOCK());
mrb_define_method(mrb, klass, "each_byte", fileEachByte, MRB_ARGS_BLOCK());
mrb_define_method(mrb, klass, "eof?", fileIsEof, MRB_ARGS_NONE());
mrb_define_method(mrb, klass, "pos", fileGetPos, MRB_ARGS_NONE());
mrb_define_method(mrb, klass, "pos=", fileSetPos, MRB_ARGS_REQ(1));
mrb_define_method(mrb, klass, "read", fileRead, MRB_ARGS_OPT(1));
mrb_define_method(mrb, klass, "readlines", fileReadLines, MRB_ARGS_OPT(1));
mrb_define_method(mrb, klass, "write", fileWrite, MRB_ARGS_REQ(1));
/* File */
mrb_define_method(mrb, klass, "mtime", fileGetMtime, MRB_ARGS_NONE());
mrb_define_method(mrb, klass, "path", fileGetPath, MRB_ARGS_NONE());
/* FileTest */
RClass *module = mrb_define_module(mrb, "FileTest");
mrb_define_module_function(mrb, module, "exist?", fileTestDoesExist, MRB_ARGS_REQ(1));
mrb_define_module_function(mrb, module, "directory?", fileTestIsDirectory, MRB_ARGS_REQ(1));
mrb_define_module_function(mrb, module, "file?", fileTestIsFile, MRB_ARGS_REQ(1));
mrb_define_module_function(mrb, module, "size", fileTestSize, MRB_ARGS_REQ(1));
}