Keil Logo Arm Logo

Technical Support

On-Line Manuals

Libraries and Floating Point Support Guide

Conventions and feedback The ARM C and C++ libraries Mandatory linkage with the C library C and C++ runtime libraries C and C++ library features Library heap usage requirements of the ARM C and C Compliance with the Application Binary Interface ( Increasing portability of object files to other CL ARM C and C++ library directory structure Selection of ARM C and C++ library variants based Thumb C libraries C++ and C libraries and the std namespace ARM C libraries and multithreading ARM C libraries and reentrant functions ARM C libraries and thread-safe functions Use of static data in the C libraries Use of the __user_libspace static data area by the C library functions to access subsections of the _ Re-implementation of legacy function __user_libspa Management of locks in multithreaded applications How to ensure re-implemented mutex functions are c Using the ARM C library in a multithreaded environ Thread safety in the ARM C library Thread safety in the ARM C++ library The floating-point status word in a multithreaded Using the C library with an application Using the C and C++ libraries with an application Using $Sub$$ to mix semihosted and nonsemihosted I Using the libraries in a nonsemihosting environmen C++ exceptions in a non-semihosting environment Direct semihosting C library function dependencies Indirect semihosting C library function dependenci C library API definitions for targeting a differen Building an application without the C library Creating an application as bare machine C without Integer and floating-point compiler functions and Bare machine integer C Bare machine C with floating-point processing Customized C library startup code and access to C Program design when exploiting the C library Using low-level functions when exploiting the C li Using high-level functions when exploiting the C l Using malloc() when exploiting the C library Tailoring the C library to a new execution environ How C and C++ programs use the library functions Initialization of the execution environment and ex C++ initialization, construction and destruction Legacy support for C$$pi_ctorvec instead of .init_ Exceptions system initialization Emergency buffer memory for exceptions Library functions called from main() Program exit and the assert macro Assembler macros that tailor locale functions in t Link time selection of the locale subsystem in the ISO8859-1 implementation Shift-JIS and UTF-8 implementation Runtime selection of the locale subsystem in the C Definition of locale data blocks in the C library LC_CTYPE data block LC_COLLATE data block LC_MONETARY data block LC_NUMERIC data block LC_TIME data block Modification of C library functions for error sign Modification of memory management functions in the Avoiding the heap and heap-using library functions C library support for memory allocation functions Heap1, standard heap implementation Heap2, alternative heap implementation Using a heap implementation from bare machine C Stack pointer initialization and heap bounds Defining __initial_sp, __heap_base and __heap_limi Extending heap size at runtime Legacy support for __user_initial_stackheap() Tailoring input/output functions in the C and C++ Target dependencies on low-level functions in the The C library printf family of functions The C library scanf family of functions Redefining low-level library functions to enable d The C library functions fread(), fgets() and gets( Re-implementing __backspace() in the C library Re-implementing __backspacewc() in the C library Redefining target-dependent system I/O functions i Tailoring non-input/output C library functions Real-time integer division in the ARM libraries Selecting real-time division in the ARM libraries How the ARM C library fulfills ISO C specification mathlib error handling ISO-compliant implementation of signals supported ISO-compliant C library input/output characteristi Standard C++ library implementation definition C library functions and extensions Persistence of C and C++ library names across rele Link time selection of C and C++ libraries Managing projects that have explicit C or C++ libr Compiler generated and library-resident helper fun C and C++ library naming conventions Using macro__ARM_WCHAR_NO_IO to disable FILE decla The ARM C micro-library Floating-point support

LC_TIME data block

LC_TIME data block

When defining a locale data block in the C library, the macros that define an LC_TIME data block are as follows:

  1. Call LC_TIME_begin with a symbol name and a locale name.

  2. Call the LC_TIME data macros as follows:

    1. Call LC_TIME_week_short seven times to provide the short names for the days of the week. Sunday being the first day. Then call LC_TIME_week_long and repeat the process for long names.

    2. Call LC_TIME_month_short twelve times to provide the short names for the days of the month. Then call LC_TIME_month_long and repeat the process for long names.

    3. Call LC_TIME_am_pm with two arguments that are respectively the strings representing morning and afternoon.

    4. Call LC_TIME_formats with three arguments that are respectively the standard date/time format used in strftime("%c"), the standard date format strftime("%x"), and the standard time format strftime("%X"). These strings must define the standard formats in terms of other simpler strftime primitives. Example 8 shows that the standard date/time format is permitted to reference the other two formats.

    5. Call LC_TIME_c99format with a single string that is the standard 12-hour time format used in strftime("%r") as defined in C99.

  3. Call LC_TIME_end, without arguments, to finish the locale block definition.

The following example shows an LC_TIME data block.

Example 8.  Defining the TIME locale

        LC_TIME_begin c_time, "C"
        LC_TIME_week_short "Sun"
        LC_TIME_week_short "Mon"
        LC_TIME_week_short "Tue"
        LC_TIME_week_short "Wed"
        LC_TIME_week_short "Thu"
        LC_TIME_week_short "Fri"
        LC_TIME_week_short "Sat"
        LC_TIME_week_long "Sunday"
        LC_TIME_week_long "Monday"
        LC_TIME_week_long "Tuesday"
        LC_TIME_week_long "Wednesday"
        LC_TIME_week_long "Thursday"
        LC_TIME_week_long "Friday"
        LC_TIME_week_long "Saturday"
        LC_TIME_month_short "Jan"
        LC_TIME_month_short "Feb"
        LC_TIME_month_short "Mar"
        LC_TIME_month_short "Apr"
        LC_TIME_month_short "May"
        LC_TIME_month_short "Jun"
        LC_TIME_month_short "Jul"
        LC_TIME_month_short "Aug"
        LC_TIME_month_short "Sep"
        LC_TIME_month_short "Oct"
        LC_TIME_month_short "Nov"
        LC_TIME_month_short "Dec"
        LC_TIME_month_long "January"
        LC_TIME_month_long "February"
        LC_TIME_month_long "March"
        LC_TIME_month_long "April"
        LC_TIME_month_long "May"
        LC_TIME_month_long "June"
        LC_TIME_month_long "July"
        LC_TIME_month_long "August"
        LC_TIME_month_long "September"
        LC_TIME_month_long "October"
        LC_TIME_month_long "November"
        LC_TIME_month_long "December"
        LC_TIME_am_pm "AM", "PM"
        LC_TIME_formats "%x %X", "%d %b %Y", "%H:%M:%S"
        LC_TIME_c99format "%I:%M:%S %p"
        LC_TIME_week_short "Sat"
        LC_TIME_end

Copyright © 2007-2008, 2011-2012 ARM. All rights reserved.ARM DUI 0378D
Non-ConfidentialID062912

Keil logo

Arm logo
Important information

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies.