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Library Functions Run Time Environment

4–26 UM004001-COR1103

• The va_arg macro does the following:

– Retrieves a value of type from the location given by arg_ptr

– Increments arg_ptr to point to the next argument in the list, using the size of type

to determine where the next argument starts

– The va_arg macro can be used any number of times within the function to retrieve

arguments from the list.

– After all arguments have been retrieved, va_end resets the pointer to NULL.

Return Value

The va_arg macro returns the current argument va_start and va_end do not return values.

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380 C-Compiler 1
User’s Manual 1
380 C-COMPILER USER’S MANUAL 3
ABOUT THIS MANUAL 3
TABLE OF CONTENTS 5
Chapter 3 6
Linking Files 6
Chapter 4 7
Run Time Environment 7
LIST OF TABLES 9
LIST OF FIGURES 11
CHAPTER 1 13
INTRODUCTION 13
ZDS ENVIRONMENT 14
RUN-TIME MODEL 15
MINIMUM REQUIREMENTS 15
INSTALLING THE 380 C-COMPILER 16
REGISTRY KEYS 16
INSTALLING ZDS 17
SAMPLE SESSION 18
UM004001-COR1103 1–7 19
Introduction Sample Session 19
Sample Session Introduction 20
1–8 UM004001-COR1103 20
Create a File 20
• Target settings 21
1–10 UM004001-COR1103 22
CONFIGURE SETTINGS 23
• Warnings 24
• Optimization levels 24
UM004001-COR1103 1–13 25
1–14 UM004001-COR1103 26
Configuring Warnings 26
UM004001-COR1103 1–15 27
1–16 UM004001-COR1103 28
1–18 UM004001-COR1103 30
Code Generation Configuration 30
COMPILING AND DOWNLOADING 31
COMPILE A PROJECT 31
DOWNLOADING A COMPILED FILE 32
TECHNICAL SUPPORT 33
OVERVIEW 35
LANGUAGE EXTENSIONS 36
ASSIGNING TYPES 36
DEFAULT MEMORY QUALIFIERS 36
POINTERS 37
SIZE OF POINTERS 37
I/O ADDRESS SPACES 37
ACCCESING I/O ADDRESS SPACE 38
INTERRUPT FUNCTIONS 39
USING THE DOS COMMAND LINE 40
COMMAND LINE FORMAT 40
COMMAND LINE SWITCHES 41
COMMAND LINE EXAMPLES 42
• Level 1 optimization 43
• Level 2 optimization 43
LEVEL 2 OPTIMIZATIONS 44
LEVEL 3 OPTIMIZATIONS 45
LEVEL 4 OPTIMIZATIONS 45
UNDERSTANDING ERRORS 45
ENABLING WARNING MESSAGES 45
INCLUDED FILES 46
PREDEFINED NAMES 46
GENERATED ASSEMBLY FILE 46
OBJECT SIZES 46
• Code Section (.text) 47
INCORPORATING ASSEMBLY WITH C 48
INCORPORATING C WITH ASSEMBLY 48
UM004001-COR1103 2–15 49
Referenced C file 49
CHAPTER 3 51
LINKING FILES 51
• COFF Format Executable File 53
RUN TIME INITIALIZATION FILE 54
INSTALLED FILES 54
INVOKING THE LINKER 54
USING THE LINKER IN ZDS 54
LINKER SYMBOLS 56
LINKER COMMAND FILE 57
3–8 UM004001-COR1103 58
Linker Command DEFINE 58
LINKER COMMAND LINE 60
COMMAND LINE SPECIFICATIONS 61
LINKER COMMAND LINE OPTIONS 62
USING THE LIBRARIAN 63
COMMAND LINE OPTIONS 64
RUN TIME ENVIRONMENT 65
CHAPTER 4 65
IGURE 4-1. FRAME LAYOUT 66
USING THE RUN-TIME LIBRARY 67
LIBRARY FUNCTIONS 69
_asm FUNCTION 69
abs FUNCTION 69
atof, atoi, atol FUNCTIONS 70
FUNCTION 71
FUNCTIONS 71
4–8 UM004001-COR1103 72
Parameter Description 72
srand FUNCTION 77
UM004001-COR1103 4–23 87
Return Value 87
4–26 UM004001-COR1103 90
APPENDIX A 91
LINK FILE 93
APPENDIX B 95
APPENDIX C 101
GLOSSARY 103
Glossary 104
Glossary-2 UM004001-COR1103 104
UM004001-COR1103 Glossary-3 105
Glossary-4 UM004001-COR1103 106
UM004001-COR1103 Glossary-5 107
Glossary-6 UM004001-COR1103 108
UM004001-COR1103 Glossary-7 109
Glossary-8 UM004001-COR1103 110
UM004001-COR1103 Glossary-9 111
Glossary-10 UM004001-COR1103 112
UM004001-COR1103 Glossary-11 113
UM004001-COR1103 Index-1 115
Index-2 UM004001-COR1103 116

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Zilog Z80380 Manuale Utente Pagina 90

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