int sqFTruncate(filenum, fileoffset)

Parms:
filenum file number
fileoffset file byte offset to truncate to.
return: 0 if ok. non-zero to fail the primitive call.

From: Interpreter, file plugin
Why:
To truncate the file, this removes bytes from the end, or extends the file depending on the meaning of truncate in the file system.

Responsibility:

/* Macro to provide default null behaviour for ftruncate - a non-ansi call
used in FilePlugin.
Override in sqPlatformSpecific.h for each platform that implements a
file truncate, or consider replacing the
../Cross/plugins/FilePlugin/sqFilePluginBasicPrims.c
file with a platform specific version as Win32 and RISC OS do.
*/
By default it is defined as
#define sqFTruncate(filenum, fileoffset) true

MacIntosh
os-9/OSXCarbon
#define sqFTruncate(f,o) ftruncate(fileno(f), o)

Cocoa:
TBD

iPhone
#define sqFTruncate(f,o) ftruncate(fileno(f), o)

Unix
#define sqFTruncate(f,o) ftruncate(fileno(f), o)

Windows
??? It's unclear I think it inherits the #define sqFTruncate(filenum, fileoffset) true

BUGS
Does Windows support sqFTruncate???