system module StdFile // **************************************************************************************** // Concurrent Clean Standard Library Module Version 2.0 // Copyright 1998 University of Nijmegen // **************************************************************************************** // File modes synonyms FReadText :== 0 // Read from a text file FWriteText :== 1 // Write to a text file FAppendText :== 2 // Append to an existing text file FReadData :== 3 // Read from a data file FWriteData :== 4 // Write to a data file FAppendData :== 5 // Append to an existing data file // Seek modes synonyms FSeekSet :== 0 // New position is the seek offset FSeekCur :== 1 // New position is the current position plus the seek offset FSeekEnd :== 2 // New position is the size of the file plus the seek offset :: *Files // Acces to the FileSystem (Files) class FileSystem f where fopen :: !{#Char} !Int !*f -> (!Bool,!*File,!*f) /* Opens a file for the first time in a certain mode (read, write or append, text or data). The boolean output parameter reports success or failure. */ fclose :: !*File !*f -> (!Bool,!*f) /* Closes a file */ stdio :: !*f -> (!*File,!*f) /* Open the 'Console' for reading and writing. */ sfopen :: !{#Char} !Int !*f -> (!Bool,!File,!*f) /* With sfopen a file can be opened for reading more than once. On a file opened by sfopen only the operations beginning with sf can be used. The sf... operations work just like the corresponding f... operations. They can't be used for files opened with fopen or freopen. */ instance FileSystem Files instance FileSystem World class FileEnv env where accFiles :: !.(*Files -> (.x,*Files)) !*env -> (!.x,!*env) appFiles :: !.(*Files -> *Files) !*env -> *env instance FileEnv World // openfiles :: !*World -> (!*Files,!*World) // no longer supported // closefiles :: !*Files !*World -> *World // no longer supported freopen :: !*File !Int -> (!Bool,!*File) /* Re-opens an open file in a possibly different mode. The boolean indicates whether the file was successfully closed before reopening. */ // Reading from a File: freadc :: !*File -> (!Bool,!Char,!*File) /* Reads a character from a text file or a byte from a datafile. The boolean indicates succes or failure */ freadi :: !*File -> (!Bool,!Int,!*File) /* Reads an Integer from a textfile by skipping spaces, tabs and newlines and then reading digits, which may be preceeded by a plus or minus sign. From a datafile freadi will just read four bytes (a Clean Int). */ freadr :: !*File -> (!Bool,!Real,!*File) /* Reads a Real from a textfile by skipping spaces, tabs and newlines and then reading a character representation of a Real number. From a datafile freadr will just read eight bytes (a Clean Real). */ freads :: ! *File !Int -> (!*{#Char},!*File) /* Reads n characters from a text or data file, which are returned as a String. If the file doesn't contain n characters the file will be read to the end of the file. An empty String is returned if no characters can be read. */ freadline :: !*File -> (!*{#Char},!*File) /* Reads a line from a textfile. (including a newline character, except for the last line) freadline cannot be used on data files. */ // Writing to a File: fwritec :: !Char !*File -> *File /* Writes a character to a textfile. To a datafile fwritec writes one byte (a Clean Char). */ fwritei :: !Int !*File -> *File /* Writes an Integer (its textual representation) to a text file. To a datafile fwritei writes four bytes (a Clean Int). */ fwriter :: !Real !*File -> *File /* Writes a Real (its textual representation) to a text file. To a datafile fwriter writes eight bytes (a Clean Real). */ fwrites :: !{#Char} !*File -> *File /* Writes a String to a text or data file. */ class (<<<) infixl a :: !*File !a -> *File /* Overloaded write to file */ instance <<< Int instance <<< Char instance <<< {#Char} instance <<< Real // Testing: fend :: !*File -> (!Bool,!*File) /* Tests for end-of-file. */ ferror :: !*File -> (!Bool,!*File) /* Has an error occurred during previous file I/O operations? */ fposition :: !*File -> (!Int,!*File) /* returns the current position of the file poInter as an Integer. This position can be used later on for the fseek function. */ fseek :: !*File !Int !Int -> (!Bool,!*File) /* Move to a different position in the file, the first Integer argument is the offset, the second argument is a seek mode. (see above). True is returned if successful. */ // Predefined files. stderr :: *File /* Open the 'Errors' file for writing only. May be opened more than once. */ // Opening and reading Shared Files: sfreadc :: !File -> (!Bool,!Char,!File) sfreadi :: !File -> (!Bool,!Int,!File) sfreadr :: !File -> (!Bool,!Real,!File) sfreads :: !File !Int -> (!*{#Char},!File) sfreadline :: !File -> (!*{#Char},!File) sfseek :: !File !Int !Int -> (!Bool,!File) sfend :: !File -> Bool sfposition :: !File -> Int /* The functions sfend and sfposition work like fend and fposition, but don't return a new file on which other operations can continue. They can be used for files opened with sfopen or after fshare, and in guards for files opened with fopen or freopen. */ // Convert a *File into: fshare :: !*File -> File /* Change a file so that from now it can only be used with sf... operations. */