C51 Compiler |
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Variable-length Argument List Routines
Routine |
Attributes |
Description |
va_arg |
reentrant |
Retrieves an argument from an argument list. |
va_end |
reentrant |
Resets an argument pointer. |
va_start |
reentrant |
Sets a pointer to the beginning of an argument list. |
The variable-length argument list routines are implemented as macros and are defined in the STDARG.H include file. These routines provide you with a portable method of accessing arguments in a function that takes a variable number of arguments. These macros conform to the ANSI C Standard for variable-length argument lists.
Miscellaneous Routines
Routine |
Attributes |
Description |
setjmp |
reentrant |
Saves the current stack condition and program address. |
longjmp |
reentrant |
Restores the stack condition and program address. |
_nop_ |
intrinsic, |
Inserts an 8051 NOP instruction. |
|
reentrant |
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_testbit_ |
intrinsic, |
Tests the value of a bit and clears it to 0. |
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reentrant |
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Routines found in the miscellaneous category do not fit easily into any other library routine category. The setjmp and longjmp routines are implemented as functions and are prototyped in the STDJMP.H include file.
The _nop_ and _testbit_ routines direct the compiler to generate an NOP instruction and a JBC instruction respectively. These routines are prototyped in the INTRINS.H include file.
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