Names Reserved for Expansion - Oracle® Solaris Studio 12.4: C User's Guide

Oracle^® Solaris Studio 12.4: C User's Guide

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Updated: March 2015

Oracle^® Solaris Studio 12.4: C User's Guide

Document Information

Using This Documentation

Chapter 1 Introduction to the C Compiler

Chapter 2 C-Compiler Implementation-Specific Information

Chapter 3 Parallelizing C Code

Chapter 4 lint Source Code Checker

Chapter 5 Type-Based Alias Analysis

Chapter 6 Transitioning to ISO C

6.1 New-Style Function Prototypes

6.1.1 Writing New Code

6.1.2 Updating Existing Code

6.1.3 Mixing Considerations

6.2 Functions With Varying Arguments

6.3 Promotions: Unsigned Versus Value Preserving

6.3.1 Some Background History

6.3.2 Compilation Behavior

6.3.3 Example: The Use of a Cast

6.3.4 Example: Same Result, No Warning

6.3.5 Integral Constants

6.3.6 Example: Integral Constants

6.4 Tokenization and Preprocessing

6.4.1 ISO C Translation Phases

6.4.2 Old C Translation Phases

6.4.3 Logical Source Lines

6.4.4 Macro Replacement

6.4.5 Using Strings

6.4.6 Token Pasting

6.5 const and volatile

6.5.1 Types for lvalue Only

6.5.2 Type Qualifiers in Derived Types

6.5.3 const Means readonly

6.5.4 Examples of const Usage

6.5.5 Examples of volatile Usage

6.6 Multibyte Characters and Wide Characters

6.6.1 Asian Languages Require Multibyte Characters

6.6.2 Encoding Variations

6.6.3 Wide Characters

6.6.4 C Language Features

6.7 Standard Headers and Reserved Names

6.7.1 Standard Headers

6.7.2 Names Reserved for Implementation Use

6.7.3 Names Reserved for Expansion

6.7.4 Names Safe to Use

6.8 Internationalization

6.8.2 setlocale() Function

6.8.3 Changed Functions

6.8.4 New Functions

6.9 Grouping and Evaluation in Expressions

6.9.1 Expression Definitions

6.9.2 K&R C Rearrangement License

6.9.3 ISO C Rules

6.9.4 Parentheses Usage

6.9.5 The As If Rule

6.10 Incomplete Types

6.10.2 Completing Incomplete Types

6.10.3 Declarations

6.10.4 Expressions

6.10.5 Justification

6.10.6 Examples: Incomplete Types

6.11 Compatible and Composite Types

6.11.1 Multiple Declarations

6.11.2 Separate Compilation Compatibility

6.11.3 Single Compilation Compatibility

6.11.4 Compatible Pointer Types

6.11.5 Compatible Array Types

6.11.6 Compatible Function Types

6.11.7 Special Cases

6.11.8 Composite Types

Chapter 7 Converting Applications for a 64-Bit Environment

Chapter 8 cscope: Interactively Examining a C Program

Appendix A Compiler Options Grouped by Functionality

Appendix B C Compiler Options Reference

Appendix C Features of C11

Appendix D Features of C99

Appendix E Implementation-Defined ISO/IEC C99 Behavior

Appendix F Implementation-Defined ISO/IEC C90 Behavior

Appendix G ISO C Data Representations

Appendix H Performance Tuning

Appendix I Oracle Solaris Studio C: Differences Between K&R C and ISO C

Language:

6.7.3 Names Reserved for Expansion

In addition to all the names explicitly reserved, the 1990 ISO/IEC C standard also reserves names for implementations and future standards that match certain patterns:

Table 6-2 Names Reserved for Expansion

File	Reserved Name Pattern
`errno.h`	`E[0-9A-Z].*`
`ctype.h`	`(to\|is)[a-z].*`
`locale.h`	`LC_[A-Z].*`
`math.h`	current function names`[fl]`
`signal.h`	`(SIG\|SIG_)[A-Z].*`
`stdlib.h`	`str[a-z].*`
`string.h`	`(str\|mem\|wcs)[a-z].*`

In this list, names that begin with a capital letter are macros and are reserved only when the associated header is included. The rest of the names designate functions and cannot be used to name any global objects or functions.

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