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RealView Libraries and Floating Point Support Guide
Preface Introduction The C and C++ Libraries About the C and C++ libraries
Features of the C and C++ libraries Namespaces Writing reentrant and thread‑safe code Introduction to reentrancy and thread‑safety Use of static data in the C libraries The __user_libspace static data area Managing locks in multithreaded applications Using the ARM C libraries with a multithreaded app Thread‑safety in the ARM C libraries Thread‑safety in the ARM C++ libraries Building an application with the C library Using the libraries with an application Building an application for a semihosted environme Building an application for a non semihosting envi Building an application without the C library Integer and FP helper functions Bare machine integer C Bare machine C with floating‑point Exploiting the C library The standalone C library functions Tailoring the C library to a new execution environ How C and C++ programs use the library functions __rt_entry Exiting from the program __rt_exit() __rt_lib_init() __rt_lib_shutdown() Tailoring static data access Tailoring locale and CTYPE using assembler macros Selecting locale at link time Selecting locale at runtime Defining a locale block LC_CTYPE data block LC_COLLATE data block LC_MONETARY data block LC_NUMERIC data block LC_TIME data block _get_lconv() localeconv() setlocale() _findlocale() The lconv structure Tailoring locale and CTYPE using C macros Selecting locale at link time Selecting locale at runtime Macros and utility functions _get_lc_ctype() _get_lc_collate() _get_lc_monetary() _get_lc_numeric() _get_lc_time() _get_lconv() localeconv() setlocale() _findlocale() __LC_CTYPE_DEF __LC_COLLATE_DEF __LC_TIME_DEF __LC_NUMERIC_DEF __LC_MONETARY_DEF __LC_INDEX_END The lconv structure Tailoring error signaling, error handling, and pro _sys_exit() errno __rt_errno_addr() __raise() __rt_raise() __default_signal_handler() _ttywrch() __rt_fp_status_addr() Tailoring storage management Avoiding the ARM‑supplied heap and heap‑using Support for malloc Tailoring the runtime memory model The memory models Controlling the runtime memory model Writing your own memory model __user_initial_stackheap() __user_setup_stackheap() __user_heap_extend() __user_heap_extent() __user_stack_cleanup_space() __rt_heap_extend() __rt_stack_postlongjmp() Tailoring the input/output functions Dependencies on low‑level functions Target‑dependent input/output support functions _sys_open() _sys_close() _sys_read() _sys_write() _sys_ensure() _sys_flen() _sys_seek() _sys_istty() _sys_tmpnam() _sys_command_string() #pragma import(_main_redirection) Tailoring other C library functions clock() _clock_init() time() remove() rename() system() getenv() _getenv_init() Selecting real‑time division ISO implementation definition ISO C library implementation definition Standard C++ library implementation definition C library extensions atoll() strtoll() strtoull() printf() snprintf() vsnprintf() lldiv() llabs() wcstombs() alloca() strlcpy() strlcat() _fisatty() __heapstats() __heapvalid() Library naming conventions Placing ARM libraries Helper libraries Identifying library variants The C Micro-library Floating‑point Support_get_lc_numeric()
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| Home > The C and C++ Libraries > Tailoring locale and CTYPE using C macros > _get_lc_numeric() | |||
_get_lc_numeric() must return a pointer to an __lc_numeric_blk structure. Use the macros in Example 2.14 to create the structure.
Example 2.14. LC_NUMERIC_DEF
__LC_NUMERIC_DEF(lcnumeric_c, "C",".","","")
__LC_NUMERIC_DEF(lcnumeric_iso8859_1, "ISO8859‑1",
".", ",", "\3")
__LC_NUMERIC_DEF(lcnumeric_fr, "fr", ",", ".", "\3")
__LC_INDEX_END(lcnumeric_dummy)
void const *_get_lc_numeric(void const *null, char const *name) {
return _findlocale(&lcnumeric_c_index, name);
}
void test_lc_numeric(void) {
double pi = 4*atan(1.);
char buf[20];
/* Test changing decimal point as we shift in and out of French
* numeric locale. */
EQS(setlocale(LC_NUMERIC, NULL), "C"); /* verify starting point */
snprintf(buf, sizeof(buf), "%g", pi); EQS(buf, "3.14159");
EQI(!setlocale(LC_NUMERIC, "ISO8859‑1"), 0);
EQS(setlocale(LC_NUMERIC, NULL), "ISO8859‑1");
snprintf(buf, sizeof(buf), "%g", pi); EQS(buf, "3.14159");
EQI(!setlocale(LC_NUMERIC, "fr"), 0);
EQS(setlocale(LC_NUMERIC, NULL), "fr");
snprintf(buf, sizeof(buf), "%g", pi); EQS(buf, "3,14159");
EQI(!setlocale(LC_NUMERIC, "C"), 0);
EQS(setlocale(LC_NUMERIC, NULL), "C");
snprintf(buf, sizeof(buf), "%g", pi); EQS(buf, "3.14159");
}
The offset fields are interpreted similarly to __lc_monetary_blk.
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