======**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://
See iPhone

**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???