OpenVMS RTL String Manipulation (STR$) Manual

Updated: 07 June 2001

Order Number: AA--PV6MB--TK

November 1996

This manual documents the string manipulation routines contained in the STR$ facility of the OpenVMS Run-Time Library.

Revision/Update Information: This manual supersedes the OpenVMS RTL String Manipulation (STR$) Manual, OpenVMS Alpha Version 7.0 and OpenVMS VAX Version 7.0.

Software Version: OpenVMS Alpha Version 7.1 OpenVMS VAX Version 7.1

Digital Equipment Corporation Maynard, Massachusetts

November 1996

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Contents Index

Preface

This manual provides users of the OpenVMS operating system with detailed usage and reference information about the string manipulation routines supplied in the STR$ facility of the Run-Time Library.

Intended Audience

This manual is intended for system and application programmers who write programs that call STR$ Run-Time Library routines.

Document Structure

This manual is organized into two parts as follows:

Part 1 is a tutorial, structured as follows:
- Chapter 1 provides a brief overview of the STR$ routines and lists the routines and their functions.
- Chapter 2 discusses in detail how to use the Run-Time Library STR$ routines.
Part 2 provides detailed reference information on each routine contained in the STR$ facility of the Run-Time Library. This information is presented using the documentation format described in OpenVMS Programming Interfaces: Calling a System Routine. Routine descriptions appear in alphabetical order by routine name.

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Conventions

The name of the OpenVMS AXP operating system has been changed to the OpenVMS Alpha operating system. Any references to OpenVMS AXP or AXP are synonymous with OpenVMS Alpha or Alpha.

VMScluster systems are now referred to as OpenVMS Cluster systems. Unless otherwise specified, references to OpenVMS Clusters or clusters in this document are synonymous with VMSclusters.

In this manual, every use of DECwindows and DECwindows Motif refers to DECwindows Motif for OpenVMS software.

The following conventions are also used in this manual:

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PF1 x or
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Additional optional arguments in a statement have been omitted.
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Part 1
STR$ Tutorial Section

This part of the OpenVMS RTL String Manipulation (STR$) Manual contains a tutorial for the OpenVMS RTL String Manipulation (STR$) facility.

The material is structured as follows:

Chapter 1 provides a brief overview of the STR$ routines and lists the routines and their functions.
Chapter 2 discusses in detail how to use the Run-Time Library STR$ routines.

Chapter 1
Run-Time Library String Manipulation (STR$) Facility

This chapter contains an overview of the STR$ facility and lists the routines and their functions. Chapter 2 explains in detail how the STR$ facility handles strings. The STR$ Reference Section describes all the STR$ routines.

1.1 Overview

The STR$ facility provides routines to perform the following functions:

Perform mathematical operations on strings (see Table 1-1)
Compare strings (see Table 1-2)
Extract and replace substrings (see Table 1-3)
Append and concatenate strings (see Table 1-4)
Copy strings (see Table 1-5)
Search for characters and substrings (see Table 1-6)
Free and allocate dynamic strings (see Table 1-7)
Perform miscellaneous functions on strings (see Table 1-8)

Table 1-1 STR$ Mathematical Operation Routines
Routine Name Function

STR$ADD Add two decimal strings

STR$DIVIDE Divide two decimal strings

STR$MUL Multiply two decimal strings

STR$RECIP Return the reciprocal of a decimal string

STR$ROUND Round or truncate a decimal string

Table 1-2 STR$ Compare Routines
Routine Name Function

STR$CASE_BLIND_COMPARE Compare strings without regard to case

STR$COMPARE Compare two strings

STR$COMPARE_EQL Compare two strings for equality

STR$COMPARE_MULTI Compare two strings for equality using the DEC Multinational Character Set

Table 1-3 STR$ Extract and Replace Routines
Routine Name Function

STR$ELEMENT Extract delimited element substring

STR$LEFT Extract a substring of a string

STR$LEN_EXTR Extract a substring of a string

STR$POS_EXTR Extract a substring of a string

STR$REPLACE Replace a substring

STR$RIGHT Extract a substring of a string

Table 1-4 STR$ Append and Concatenate Routines
Routine Name Function

STR$APPEND Append a string

STR$CONCAT Concatenate two or more strings

STR$PREFIX Prefix a string

Table 1-5 STR$ Copy Routines
Routine Name Function

STR$COPY_DX Copy a source string passed by descriptor to a destination string

STR$COPY_R Copy a source string passed by reference to a destination string

++STR$COPY_R_64 Copy a source string passed by reference to a destination string

++Alpha specific.

Table 1-6 STR$ Search Routines
Routine Name Function

STR$FIND_FIRST_IN_SET Find the first character in a set of characters

STR$FIND_FIRST_NOT_IN_SET Find the first character that does not occur in the set

STR$FIND_FIRST_SUBSTRING Find the first substring in the input string

Table 1-7 STR$ Allocate and Deallocate Routines
Routine Name Function

STR$FREE1_DX Free one dynamic string

STR$GET1_DX Allocate one dynamic string

++STR$GET1_DX_64 Allocate one dynamic string

++Alpha specific.

Table 1-8 STR$ Miscellaneous Routines
Routine Name Function

STR$ANALYZE_SDESC Analyze a string descriptor

++STR$ANALYZE_SDESC_64 Analyze a string descriptor

STR$DUPL_CHAR Duplicate character n times

STR$MATCH_WILD Match a wildcard specification

STR$POSITION Return relative position of a substring

STR$TRANSLATE Translate matched characters

STR$TRIM Trim trailing blanks and tabs

STR$UPCASE Convert string to all uppercase

++Alpha specific.

1.1.1 64-Bit Addressing Support (Alpha Only)

On Alpha systems, the String Manipulation (STR$) routines provide 64-bit virtual addressing capabilities as follows:

All STR$ RTL routines now accept 64-bit addresses for arguments passed by reference.
All STR$ RTL routines also accept either 32-bit or 64-bit descriptors for arguments passed by descriptor.
In some cases a new routine was added to support a 64-bit addressing or data capability. These routines carry the same name as the original routine but with a _64 suffix. In general, both versions of the routine support 64-bit addressing but the routine with the _64 suffix also supports additional 64-bit capability. The 32-bit capabilities of the original routine are unchanged.

See the OpenVMS Alpha Guide to 64-Bit Addressing and VLM Features for more information about 64-bit virtual addressing capabilities.

Contents

Index