le_basics.h File Reference

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Macros
#define	CONTAINER_OF(memberPtr, type, member)   ((type*)(((uint8_t*)(memberPtr))-((size_t)(&(((type*)0)->member)))))
#define	NUM_ARRAY_MEMBERS(array)   (sizeof(array) / sizeof((array)[0]))
#define	INDEX_OF_ARRAY_MEMBER(array, memberPtr)   ((((size_t)memberPtr) - ((size_t)array)) / sizeof(*(memberPtr)))
#define	STRINGIZE(x)   STRINGIZE_EXPAND(x)
#define	STRINGIZE_EXPAND(x)   #x
Bit Masks
Single byte bit definitions that can be used for bit masking.
#define	BIT0   0x01
#define	BIT1   0x02
#define	BIT2   0x04
#define	BIT3   0x08
#define	BIT4   0x10
#define	BIT5   0x20
#define	BIT6   0x40
#define	BIT7   0x80

Enumerations
enum	le_result_t {   LE_OK = 0, LE_NOT_FOUND = -1, LE_NOT_POSSIBLE = -2, LE_OUT_OF_RANGE = -3,   LE_NO_MEMORY = -4, LE_NOT_PERMITTED = -5, LE_FAULT = -6, LE_COMM_ERROR = -7,   LE_TIMEOUT = -8, LE_OVERFLOW = -9, LE_UNDERFLOW = -10, LE_WOULD_BLOCK = -11,   LE_DEADLOCK = -12, LE_FORMAT_ERROR = -13, LE_DUPLICATE = -14, LE_BAD_PARAMETER = -15,   LE_CLOSED = -16, LE_BUSY = -17 }
enum	le_onoff_t { LE_OFF = 0, LE_ON = 1 }

Detailed Description

Legato Basic Type and Constant Definitions include file.

Copyright (C) Sierra Wireless, Inc. 2014. All rights reserved. Use of this work is subject to license.

Macro Definition Documentation

#define CONTAINER_OF	(		memberPtr,
			type,
			member
	)		((type*)(((uint8_t*)(memberPtr))-((size_t)(&(((type*)0)->member)))))

Find the address of a containing structure or union, based on the address of one of its members.

If countPtr points to the count member of an object type my_class_t, then a pointer to that object should use this:

my_class_t* myObjPtr = CONTAINER_OF(countPtr, my_class_t, count);

#define INDEX_OF_ARRAY_MEMBER	(		array,
			memberPtr
	)		((((size_t)memberPtr) - ((size_t)array)) / sizeof(*(memberPtr)))

Computes the index of a member within an array.

This code sample prints out "The 'w' is at index 6.":

const char message[] = "Hello world!";
const char* charPtr;
int i;

for (i = 0; i < sizeof(message); i++)
{
    if (message[i] == 'w')
    {
        charPtr = &message[i];
    }
}

printf("The 'w' is at index %zu.\n", INDEX_OF_ARRAY_MEMBER(message, charPtr));

#define NUM_ARRAY_MEMBERS

(

array

)

(sizeof(array) / sizeof((array)[0]))

Computes number of members in an array at compile time.

Warning

Does NOT work for pointers to arrays.

Here's a code sample:

const char message[] = "Hello world!";

size_t x = NUM_ARRAY_MEMBERS(message);

printf("%lu\n", x);

Will print 13 on a 32-bit target.

But this example is incorrect:

const char message[] = "Hello world!";
const char* messagePtr = &message;

size_t x = NUM_ARRAY_MEMBERS(messagePtr);    // NO! BAD PROGRAMMER! BAD!

printf("%lu\n", x);

#define STRINGIZE

(

x

)

STRINGIZE_EXPAND(x)

This function takes the characters as an argument and puts quotes around them.

Code sample:

const char name[] = STRINGIZE(foo);

Is seen by the compiler as

const char name[] = "foo";

The STRINGIZE() macro function passes names like macro definitions on the compiler's command-line. If the above code were changed to:

const char name[] = STRINGIZE(NAME);

then compiling it using the gcc -c command makes it equivalent to the example above:

$ gcc -c -DNAME=foo file.c

#define STRINGIZE_EXPAND

(

x

)

#x

Helper macro for STRINGIZE(x).

Enumeration Type Documentation

enum le_onoff_t

ON/OFF type.

enum le_result_t

Standard result codes.

Note

All error codes are negative integers. They allow functions with signed integers to return non-negative values when successful or standard error codes on failure.

Enumerator
LE_OK	Successful.
LE_NOT_FOUND	Referenced item does not exist or could not be found.
LE_NOT_POSSIBLE	It is not possible to perform the requested action.
LE_OUT_OF_RANGE	An index or other value is out of range.
LE_NO_MEMORY	Insufficient memory is available.
LE_NOT_PERMITTED	Current user does not have permission to perform requested action.
LE_FAULT	Unspecified internal error.
LE_COMM_ERROR	Communications error.
LE_TIMEOUT	A time-out occurred.
LE_OVERFLOW	An overflow occurred or would have occurred.
LE_UNDERFLOW	An underflow occurred or would have occurred.
LE_WOULD_BLOCK	Would have blocked if non-blocking behaviour was not requested.
LE_DEADLOCK	Would have caused a deadlock.
LE_FORMAT_ERROR	Format error.
LE_DUPLICATE	Duplicate entry found or operation already performed.
LE_BAD_PARAMETER	Parameter is invalid.
LE_CLOSED	The resource is closed.
LE_BUSY	The resource is busy or unavailable.