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Introduction

The library provides a set of functions that perform CMS disk file input and output operations. These functions are characterized as low-level I/O functions because they use the CMS file system directly. The library provides a second set of functions that can perform I/O operations on files in XEDIT storage. These functions are known as the XEDIT low-level I/O functions.

This chapter covers the low-level I/O functions as well as three utility functions that can be used with the I/O functions. Note that these functions are not portable.

The CMS low-level I/O functions are as follows:

cmsstate	verifies the existence of a CMS disk file
cmsopen	opens a CMS disk file
cmsread	reads a record from a CMS disk file
cmswrite	writes a record to a CMS disk file
cmspoint	changes the current record pointer for a CMS disk file
cmsclose	closes a CMS disk file
cmserase	erases a CMS disk file.

The low-level XEDIT I/O functions are as follows:

cmsxflst	verifies the existence of an XEDIT file
cmsxflrd	reads a record from XEDIT storage
cmsxflwr	writes a record to XEDIT storage
cmsxflpt	moves the current line pointer in an XEDIT file.

The related utility functions are as follows:

cmspid	tokenizes a filename string in "cms" or "xed" style
cmsdfind	finds a file identifier that matches a pattern
cmsdnext	finds the next file identifier that matches a pattern.

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