le_basics.h

    1 /**
    2  * @page c_basics Basic Type and Constant Definitions
    3  *
    4  * Cardinal types and commonly-used constants form the basic
    5  * foundation on which everything else is built. These include
    6  * error codes, portable integer types, and helpful macros that make things easier to use.
    7  *
    8  * See @ref le_basics.h for basic cardinal types and commonly-used constants info.
    9  *
   10  * <HR>
   11  *
   12  * Copyright (C) Sierra Wireless Inc.
   13  */
   14 
   15 
   16 /** @file le_basics.h
   17  *
   18  * Legato @ref c_basics include file.
   19  *
   20  * Copyright (C) Sierra Wireless Inc.
   21  */
   22 
   23 #ifndef LEGATO_BASICS_INCLUDE_GUARD
   24 #define LEGATO_BASICS_INCLUDE_GUARD
   25 
   26 //--------------------------------------------------------------------------------------------------
   27 /**
   28  * Standard result codes.
   29  *
   30  * @note All error codes are negative integers. They allow functions with signed
   31  *       integers to return non-negative values when successful or standard error codes on failure.
   32  * @deprecated the result code LE_NOT_POSSIBLE is scheduled to be removed.
   33  */
   34 //--------------------------------------------------------------------------------------------------
   35 typedef enum
   36 {
   37     LE_OK = 0,                  ///< Successful.
   38     LE_NOT_FOUND = -1,          ///< Referenced item does not exist or could not be found.
   39     LE_NOT_POSSIBLE = -2,       ///< @deprecated It is not possible to perform the requested action.
   40     LE_OUT_OF_RANGE = -3,       ///< An index or other value is out of range.
   41     LE_NO_MEMORY = -4,          ///< Insufficient memory is available.
   42     LE_NOT_PERMITTED = -5,      ///< Current user does not have permission to perform requested action.
   43     LE_FAULT = -6,              ///< Unspecified internal error.
   44     LE_COMM_ERROR = -7,         ///< Communications error.
   45     LE_TIMEOUT = -8,            ///< A time-out occurred.
   46     LE_OVERFLOW = -9,           ///< An overflow occurred or would have occurred.
   47     LE_UNDERFLOW = -10,         ///< An underflow occurred or would have occurred.
   48     LE_WOULD_BLOCK = -11,       ///< Would have blocked if non-blocking behaviour was not requested.
   49     LE_DEADLOCK = -12,          ///< Would have caused a deadlock.
   50     LE_FORMAT_ERROR = -13,      ///< Format error.
   51     LE_DUPLICATE = -14,         ///< Duplicate entry found or operation already performed.
   52     LE_BAD_PARAMETER = -15,     ///< Parameter is invalid.
   53     LE_CLOSED = -16,            ///< The resource is closed.
   54     LE_BUSY = -17,              ///< The resource is busy.
   55     LE_UNSUPPORTED = -18,       ///< The underlying resource does not support this operation.
   56     LE_IO_ERROR = -19,          ///< An IO operation failed.
   57     LE_NOT_IMPLEMENTED = -20,   ///< Unimplemented functionality.
   58     LE_UNAVAILABLE = -21,       ///< A transient or temporary loss of a service or resource.
   59     LE_TERMINATED = -22,        ///< The process, operation, data stream, session, etc. has stopped.
   60     LE_IN_PROGRESS = -23,       ///< The operation is in progress.
   61 }
   62 le_result_t;
   63 
   64 
   65 //--------------------------------------------------------------------------------------------------
   66 /**
   67  * ON/OFF type.
   68  *
   69  */
   70 //--------------------------------------------------------------------------------------------------
   71 typedef enum
   72 {
   73     LE_OFF = 0,
   74     LE_ON  = 1,
   75 }
   76 le_onoff_t;
   77 
   78 
   79 //--------------------------------------------------------------------------------------------------
   80 /** @name Bit Masks
   81  *
   82  * Single byte bit definitions that can be used for bit masking.
   83  * @{
   84  */
   85 //--------------------------------------------------------------------------------------------------
   86 #define BIT0        0x01
   87 #define BIT1        0x02
   88 #define BIT2        0x04
   89 #define BIT3        0x08
   90 #define BIT4        0x10
   91 #define BIT5        0x20
   92 #define BIT6        0x40
   93 #define BIT7        0x80
   94 // @}
   95 
   96 //--------------------------------------------------------------------------------------------------
   97 /**
   98  * Find the address of a containing structure or union, based on the address of one of its members.
   99  *
  100  * If @c countPtr points to the @c count member of an object type
  101  * @c my_class_t, then a pointer to that object should use this:
  102  *
  103  * @code
  104  * my_class_t* myObjPtr = CONTAINER_OF(countPtr, my_class_t, count);
  105  * @endcode
  106  */
  107 //--------------------------------------------------------------------------------------------------
  108 #define CONTAINER_OF(memberPtr, type, member)                                                       \
  109     ((type*)(((uint8_t*)(memberPtr))-((size_t)(&(((type*)0)->member)))))
  110 
  111 
  112 //--------------------------------------------------------------------------------------------------
  113 /**
  114  * Computes  number of members in an array at compile time.
  115  *
  116  * @warning Does NOT work for pointers to arrays.
  117  *
  118  * Here's a code sample:
  119  *
  120  * @code
  121  * const char message[] = "Hello world!";
  122  *
  123  * size_t x = NUM_ARRAY_MEMBERS(message);
  124  *
  125  * printf("%lu\n", x);
  126  * @endcode
  127  *
  128  * Will print @c 13 on a 32-bit target.
  129  *
  130  * But this example is @b incorrect:
  131  *
  132  * @code
  133  * const char message[] = "Hello world!";
  134  * const char* messagePtr = &message;
  135  *
  136  * size_t x = NUM_ARRAY_MEMBERS(messagePtr);    // NO! BAD PROGRAMMER! BAD!
  137  *
  138  * printf("%lu\n", x);
  139  * @endcode
  140  */
  141 //--------------------------------------------------------------------------------------------------
  142 #define NUM_ARRAY_MEMBERS(array) \
  143     (sizeof(array) / sizeof((array)[0]))
  144 
  145 
  146 //--------------------------------------------------------------------------------------------------
  147 /**
  148  * Computes the index of a member within an array.
  149  *
  150  * This code sample prints out "The 'w' is at index 6.":
  151  *
  152  * @code
  153  * const char message[] = "Hello world!";
  154  * const char* charPtr;
  155  * int i;
  156  *
  157  * for (i = 0; i < sizeof(message); i++)
  158  * {
  159  *     if (message[i] == 'w')
  160  *     {
  161  *         charPtr = &message[i];
  162  *     }
  163  * }
  164  *
  165  * printf("The 'w' is at index %zu.\n", INDEX_OF_ARRAY_MEMBER(message, charPtr));
  166  * @endcode
  167  **/
  168 //--------------------------------------------------------------------------------------------------
  169 #define INDEX_OF_ARRAY_MEMBER(array, memberPtr) \
  170     ((((size_t)memberPtr) - ((size_t)array)) / sizeof(*(memberPtr)))
  171 
  172 
  173 //--------------------------------------------------------------------------------------------------
  174 /**
  175  * This function takes the characters as an argument and puts quotes around them.
  176  *
  177  * Code sample:
  178  *
  179  * @code
  180  *    const char name[] = STRINGIZE(foo);
  181  * @endcode
  182  *
  183  * Is seen by the compiler as
  184  *
  185  * @code
  186  *    const char name[] = "foo";
  187  * @endcode
  188  *
  189  * The STRINGIZE() macro function passes names like macro definitions
  190  * on the compiler's command-line.  If the above code were changed to:
  191  *
  192  * @code
  193  *    const char name[] = STRINGIZE(NAME);
  194  * @endcode
  195  *
  196  * then compiling it using the following command line makes it equivalent to the
  197  * example above:
  198  *
  199  * @code
  200  *    $ gcc -c -DNAME=foo file.c
  201  * @endcode
  202  *
  203  * The <c>-DNAME=foo</c> defines a macro called <c>NAME</c> with a value <c>foo</c>.
  204  * The C preprocessor then replaces <c>STRINGIZE(NAME)</c> with <c>"foo"</c>.
  205  */
  206 //--------------------------------------------------------------------------------------------------
  207 #define STRINGIZE(x)  STRINGIZE_EXPAND(x)
  208 
  209 //--------------------------------------------------------------------------------------------------
  210 /**
  211  * Helper macro for @ref STRINGIZE(x).
  212  */
  213 //--------------------------------------------------------------------------------------------------
  214 #define STRINGIZE_EXPAND(x)     #x   // Needed to expand macros.
  215 
  216 //--------------------------------------------------------------------------------------------------
  217 /**
  218  * Macro to help concatenate preprocessor tokens while first allowing macro expansion of those
  219  * tokens.
  220  *
  221  * Original source: https://github.com/pfultz2/Cloak/wiki/C-Preprocessor-tricks,-tips,-and-idioms
  222  */
  223 //--------------------------------------------------------------------------------------------------
  224 #define CAT(a, ...) PRIMITIVE_CAT(a, __VA_ARGS__)
  225 
  226 //--------------------------------------------------------------------------------------------------
  227 /**
  228  * Helper macro for @ref STRINGIZE(x).
  229  */
  230 //--------------------------------------------------------------------------------------------------
  231 #define PRIMITIVE_CAT(a, ...) a ## __VA_ARGS__
  232 
  233 //--------------------------------------------------------------------------------------------------
  234 /**
  235  * Helper macro for @ref SECOND(...).  Always select the second parameter.
  236  */
  237 //--------------------------------------------------------------------------------------------------
  238 #define SECOND(a, b, ...) b
  239 
  240 //--------------------------------------------------------------------------------------------------
  241 /**
  242  * If the macro passed as the first parameter is defined in the form ,<value> (note the leading
  243  * comma) this evaluates to <value>.  If the macro is not defined in this format (or not defined at
  244  * all, this evaluates to the second, default parameter.
  245  */
  246 //--------------------------------------------------------------------------------------------------
  247 #define LE_DEFAULT(...) SECOND(__VA_ARGS__)
  248 
  249 //--------------------------------------------------------------------------------------------------
  250 /**
  251  * Macro used to declare that a symbol should be shared outside the dynamic shared object in
  252  * which it is defined.
  253  *
  254  * This can be used with either a declaration or a definition.
  255  *
  256  * E.g., with a declaration (perhaps in a header file):
  257  *
  258  * @code
  259  * LE_SHARED void my_Function();
  260  * @endcode
  261  *
  262  * E.g., with a definition (in a .c file):
  263  *
  264  * @code
  265  * LE_SHARED void my_OtherFunction()
  266  * {
  267  *     LE_INFO("Hello world.");
  268  * }
  269  * @endcode
  270  *
  271  **/
  272 //--------------------------------------------------------------------------------------------------
  273 #define LE_SHARED __attribute__((visibility ("default")))
  274 
  275 //--------------------------------------------------------------------------------------------------
  276 /**
  277  * @macro LE_DECLARE_INLINE
  278  *
  279  * Declare an inline function in a header.
  280  *
  281  * GNU by default uses a non-standard method of declaring inline functions with the
  282  * exact *opposite* meaning of the C99 standard.
  283  *
  284  * So use LE_DECLARE_INLINE with the function body in a header.  Then use LE_DEFINE_INLINE with
  285  * just the function prototype in a .c file to tell the compiler to emit the function definition
  286  * for cases where the function is not inlined.
  287  *
  288  * This is preferred over using "static inline" since if a static inline function is not inlined
  289  * by gcc, there may be multiple copies of the function included in the output.
  290  */
  291 /**
  292  * @macro LE_DEFINE_INLINE
  293  *
  294  * Cause a function definition to be emitted for an inline function, in case the compiler
  295  * decides not to use the inline definition.
  296  *
  297  * @see @c LE_DECLARE_INLINE
  298  */
  299 //--------------------------------------------------------------------------------------------------
  300 #ifdef __GNUC_GNU_INLINE__
  301 // Using gcc inline semantics
  302 #  define LE_DECLARE_INLINE extern inline
  303 #  define LE_DEFINE_INLINE inline
  304 #else
  305 // Use C99 inline semantics
  306 #  define LE_DECLARE_INLINE inline
  307 #  define LE_DEFINE_INLINE extern inline
  308 #endif
  309 
  310 // Clang feature check macros -- define to return sensible defaults if macro is not available.
  311 #ifndef __is_identifier
  312 #  define __is_identifier(x) 1
  313 #endif
  314 
  315 #ifndef __has_warning
  316 #  define  __has_warning(x) 0
  317 #endif
  318 
  319 #ifndef __has_attribute
  320 #  define __has_attribute(x) 0
  321 #endif
  322 
  323 #if !__is_identifier(_Nonnull)
  324 
  325 // Nullability information is not complete.  Normally clang will warn in that case.
  326 #  if __has_warning("-Wnullability-completeness")
  327 #    pragma clang diagnostic ignored "-Wnullability-completeness"
  328 #  endif
  329 
  330 //--------------------------------------------------------------------------------------------------
  331 /**
  332  * Mark a parameter or return value as never NULL.
  333  */
  334 //--------------------------------------------------------------------------------------------------
  335 #  define LE_NONNULL _Nonnull
  336 
  337 //--------------------------------------------------------------------------------------------------
  338 /**
  339  * Mark a parameter or return value as potentially NULL.
  340  */
  341 //--------------------------------------------------------------------------------------------------
  342 #  define LE_NULLABLE _Nullable
  343 #else
  344 #  define LE_NONNULL
  345 #  define LE_NULLABLE
  346 #endif
  347 
  348 //--------------------------------------------------------------------------------------------------
  349 /**
  350  * Mark a variable as unused.
  351  *
  352  * @param   v   Variable to mark as unused.
  353  */
  354 //--------------------------------------------------------------------------------------------------
  355 #define LE_UNUSED(v)    ((void) (v))
  356 
  357 //--------------------------------------------------------------------------------------------------
  358 /**
  359  * Format specifiers for size_t
  360  */
  361 //--------------------------------------------------------------------------------------------------
  362 #if (__STDC_VERSION__ >= 199901L) || LE_CONFIG_LINUX
  363 #   define __PRIS_PREFIX "z"
  364 #elif defined(__LP64__) || defined(_LP64)
  365 #   define __PRIS_PREFIX "ll"
  366 #else
  367 #   define __PRIS_PREFIX "l"
  368 #endif
  369 
  370 #define PRIdS __PRIS_PREFIX "d"
  371 #define PRIxS __PRIS_PREFIX "x"
  372 #define PRIuS __PRIS_PREFIX "u"
  373 #define PRIXS __PRIS_PREFIX "X"
  374 #define PRIoS __PRIS_PREFIX "o"
  375 
  376 
  377 #if !defined(static_assert) && !defined(__cplusplus)
  378 //--------------------------------------------------------------------------------------------------
  379 /**
  380  * Provide static_assert if not available.
  381  */
  382 //--------------------------------------------------------------------------------------------------
  383 #   define static_assert(cond, msg) _Static_assert((cond), #cond ": " msg)
  384 #endif
  385 #define inline_static_assert(cond, msg) ({ static_assert(cond, msg); })
  386 
  387 //--------------------------------------------------------------------------------------------------
  388 /**
  389  * Test if a KConfig feature is enabled.
  390  */
  391 //--------------------------------------------------------------------------------------------------
  392 #define LE_CONFIG_IS_ENABLED(option)    (("" #option)[0] == '1')
  393 
  394 #endif // LEGATO_BASICS_INCLUDE_GUARD
LE_FORMAT_ERROR
Format error. 
Definition: le_basics.h:50
LE_UNSUPPORTED
The underlying resource does not support this operation. 
Definition: le_basics.h:55
LE_NOT_PERMITTED
Current user does not have permission to perform requested action. 
Definition: le_basics.h:42
LE_FAULT
Unspecified internal error. 
Definition: le_basics.h:43
LE_DUPLICATE
Duplicate entry found or operation already performed. 
Definition: le_basics.h:51
LE_NO_MEMORY
Insufficient memory is available. 
Definition: le_basics.h:41
le_result_t
le_result_t
Definition: le_basics.h:35
LE_IO_ERROR
An IO operation failed. 
Definition: le_basics.h:56
LE_DEADLOCK
Would have caused a deadlock. 
Definition: le_basics.h:49
LE_OK
Successful. 
Definition: le_basics.h:37
LE_NOT_IMPLEMENTED
Unimplemented functionality. 
Definition: le_basics.h:57
LE_OVERFLOW
An overflow occurred or would have occurred. 
Definition: le_basics.h:46
LE_TIMEOUT
A time-out occurred. 
Definition: le_basics.h:45
LE_UNDERFLOW
An underflow occurred or would have occurred. 
Definition: le_basics.h:47
LE_NOT_FOUND
Referenced item does not exist or could not be found. 
Definition: le_basics.h:38
LE_CLOSED
The resource is closed. 
Definition: le_basics.h:53
LE_UNAVAILABLE
A transient or temporary loss of a service or resource. 
Definition: le_basics.h:58
LE_NOT_POSSIBLE
Definition: le_basics.h:39
LE_BUSY
The resource is busy. 
Definition: le_basics.h:54
LE_IN_PROGRESS
The operation is in progress. 
Definition: le_basics.h:60
LE_OUT_OF_RANGE
An index or other value is out of range. 
Definition: le_basics.h:40
LE_BAD_PARAMETER
Parameter is invalid. 
Definition: le_basics.h:52
LE_WOULD_BLOCK
Would have blocked if non-blocking behaviour was not requested. 
Definition: le_basics.h:48
LE_TERMINATED
The process, operation, data stream, session, etc. has stopped. 
Definition: le_basics.h:59
LE_COMM_ERROR
Communications error. 
Definition: le_basics.h:44
le_onoff_t
le_onoff_t
Definition: le_basics.h:71