NSError * anError // And finally, the task: read and store the contents of a file as an // NSString. It's optional, but we'll create an NSError // anyways to demonstrate best practice. NSString * filePath = // The selector we're going to use to complete this task, // stringWithContentsOfFile:encoding:error, has an optional `error' // parameter which can be used to return information about any // errors it might run into. THE TASK */ // Instantiate an NSString which describes the filesystem location of // the file we will be reading. system ( "echo \" Hello, World! \" > ~/HelloRosetta" ) /*** 1. PREPARATION */ // We need a text file to read let's redirect a C string to a new file // using the shell by way of the stdlib system() function. : open-this-file ( - ) s" read_entire_file.blue" drop open-file įile related operations are provided under the system namespace : unmap-file ( buf - ) file-size munmap : map-file ( - buf ) fd file-size map-file : map-file ( fd len - buf ) 0 0 prot_read map_private mmap : read-file-size ( - ) fd stat_buf fstat : open-file ( pathname:edi - ) read-only open fd ! : munmap ( addr:edi len:esi - ) 11 syscall ordie : mmap ( fd:r8d len:esi addr:edi off:r9d prot:edx flags:r10d - buf:eax ) 9 syscall unwrap : fstat ( fd:edi buf:esi - ) 5 syscall ordie : open ( pathname:edi flags:esi - fd:eax ) 2 syscall unwrap : unwrap ( result:eax - value:eax ) dup 0 cmp ' die xl : exit ( status:edi - noret ) 60 syscall : syscall ( num:eax - result:eax ) syscall To make conv, eg make conv(tape, ebcdic conv). The book can contain new pages and new lines, are not of any particularĬharacter set, hence are system independent. In official ALGOL 68 a file is composed of pages, lines and characters, howeverįor ALGOL 68 Genie and ELLA ALGOL 68RS this concept is not supported as theyĪdopt the Unix concept of files being "flat", and hence contain only characters. You can use -gnatW8 in Ada 2005 mode to use UTF-8 characters in identifier names. The GNU Ada compiler (GNAT) seems to read in text files as bytes, completely ignoring any operating system information on character encoding.
#C file peek c full
Wide_Wide_Character - containing the full set of ISO-10646 characters.Wide_Character - containing the set of ISO-10646 BMP characters.Character - containing the set of ISO-8859-1 characters.What Ada does specify is three different character types (and corresponding string types): Put ( Text ) end Unmap_Memory ( First => Text_Address, Length => Text_Size ) Close ( File => Text_File ) end Read_Entire_File Ĭharacter encodings and their handling are not really specified in Ada. Natural ( Text_Size )) for Text ' Address use Text_Address begin Ada. Address begin Text_File := Open ( Name => "read_entire_file.adb", Mode => Read_Only ) Text_Size := Storage_Offset ( File_Size ( Text_File )) Text_Address := Map_Memory ( Length => Text_Size, Protection => Allow_Read, Mapping => Map_Shared, File => Text_File, Offset => 0 ) declare Text : String ( 1. Memory_Mapping use System.Storage_Elements Text_File : File_Descriptor Text_Size : System. Storage_Elements procedure Read_Entire_File is use POSIX, POSIX.
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