4.4.2 Input/output with UIO

4.4.2.1 uio_switch_system_l01

(``uio switch system list 01'') in uio_mac_module.F90.
Category: I/O, account for property of machine.
Sometimes, it is useful to have in the header of a UIO file information about the system that wrote the file. How Fortran gets this information depends on the machine. Values:

• 0: Read information from file uioenvfile.txt. Don't write or delete the file.
• 1: Call external function system() to produce the file uioenvfile.txt. Read and delete the file (default).
• 2: Call routine system() to produce uioenvfile.txt. Read and delete the file.
• 3: Call external routine HF_SH() to produce uioenvfile.txt. Read and delete it.
• 4: Call external function uname() to get system information.
• 5: Call external routine pxfuname() to get system information.

4.4.2.2 uio_switch_native_l01

(``uio switch native list 01'') in uio_mac_module.F90.
Category: I/O, account for property of machine.
All machines can read and write their native format - only that it might differ from one machine to the other. It is there, if needed, but should be avoided in practise. Values:

• 1: Get information about word lengths from uio_deform() (default).
• 0,2: Set word lengths explicitly.

4.4.2.3 uio_switch_ieeebe_l01

(``uio switch ieee big endian list 01'') in uio_mac_module.F90.
Category: I/O, account for property of machine.
This is the standard for files read of written by CO5BOLD. All machine/compiler combinations should support it - either natively or via some conversion process. Values:

• 0: Don't include this conversion type (default).
• 1: Get information about word lengths from uio_deform().
• 2: Set word lengths explicitly.

4.4.2.4 uio_switch_ieeele_l01

(``uio switch ieee little endian list 01'') in uio_mac_module.F90.
Category: I/O, account for property of machine. Values:

• 0: Don't include this conversion type (default).
• 1: Get information about word lengths from uio_deform().
• 2: Set word lengths explicitly.

4.4.2.5 uio_switch_ieee_l01

(``uio switch ieee list 01'') in uio_mac_module.F90.
Category: I/O, account for property of machine.
This is a fallback for reading of UIO files, that should be activated for compilation if either of the Endian formats above is allowed. It should not be used for writing. Values:

• 0: Don't include this conversion type (default).
• 1: Get information about word lengths from uio_deform().
• 2: Set word lengths explicitly (4-byte words).
• 3: Set word lengths explicitly (8-byte words).

4.4.2.6 uio_switch_crayxmp_l01

(``uio switch cray x-mp list 01'') in uio_mac_module.F90.
Category: I/O, account for property of machine.
This is the native format on old Cray X-MP and Cray TS machines. Values:

• 0: Don't include this conversion type (default).
• 1: Get information about word lengths from uio_deform().

4.4.2.7 uio_switch_open_l01

(``uio switch open list 01'') in uio_mac_module.F90.
Category: I/O, account for property of machine.
Many compilers support a transparent conversion between number representations during reading and writing. This is not a Fortran standard, though, and has to be activated in different ways:

• 0: No conversion (default).
• 1: Use the'convert keyword in the open() statement (Intel and gfortran compilers on Linux machines, standard compiler on Dec Alphas).
• 2: Use asnunit() Cray X-MP style.
• 3: Use asnunit() Cray TS style.