HP 3000 Manuals HP 3000 Manuals
Chapter 4 LANGUAGES HP C/iX Enhancements by Erryl Johnson Systems Technology Division BYTE STREAM FILE SUPPORT The HP C/iX compiler and libraries have been enhanced to support the new MPE/iX byte stream file type. Byte stream files are files that conform to the definition of a stream file as defined by POSIX. They differ from ordinary HP C/iX stream files in that the MPE/iX file structure is transparent to them. For example, there are no physical end-of-records and there is no difference between binary and ASCII files. PRODUCT CHANGES The HP C/iX compiler and preprocessor, and functions in the HP C/iX library, were changed to allow them to access byte stream files. The HP C/iX Library functions that were changed are fopen(), freopen(), open, read, write and lseek. HP C/iX Compiler Changes The HP C/iX compiler and preprocessor were changed to allow source code input from byte stream files. The changes are internal and are not evident to the user. HP C/iX Library Changes Functions were changed in the HP C/iX Library to allow them to access byte stream files. Functions were changed in the library as follows. fopen(), freopen() - A new value of Bs was added for the mode parameter to specify that a byte stream file is to be opened. A byte stream file has a file type of BA and the record length is 1B. open() - A new value of Bs was added for the mpe-opts parameter to specify that a byte stream file is to be opened. read(), write() - These functions were enhanced to read and write byte stream files. lseek() - The lseek() function was enhanced to move the read/write file pointer in byte stream files.