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string: add strftime

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2023-10-01 23:21:11 +02:00
parent a888731c39
commit 82a16ef579
1 changed files with 86 additions and 2 deletions
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88
include/stdex/string.hpp
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@ -10,9 +10,10 @@
#include <ctype.h> #include <ctype.h>
#include <locale.h> #include <locale.h>
#include <stdarg.h> #include <stdarg.h>
#include <stdarg.h>
#include <stdint.h> #include <stdint.h>
#include <stdio.h> #include <stdio.h>
#include <stdarg.h> #include <time.h>
#ifdef __APPLE__ #ifdef __APPLE__
#include <xlocale.h> #include <xlocale.h>
#endif #endif
@ -1179,7 +1180,6 @@ namespace stdex
inline int vsnprintf(_Out_z_cap_(capacity) wchar_t *str, _In_ size_t capacity, _In_z_ _Printf_format_string_params_(2) const wchar_t *format, _In_opt_ locale_t locale, _In_ va_list arg) inline int vsnprintf(_Out_z_cap_(capacity) wchar_t *str, _In_ size_t capacity, _In_z_ _Printf_format_string_params_(2) const wchar_t *format, _In_opt_ locale_t locale, _In_ va_list arg)
{ {
int r; int r;
#ifdef _WIN32 #ifdef _WIN32
// Don't use _vsnwprintf_s(). It terminates the string even if we want to print to the edge of the buffer. // Don't use _vsnwprintf_s(). It terminates the string even if we want to print to the edge of the buffer.
#pragma warning(suppress: 4996) #pragma warning(suppress: 4996)
@ -1311,6 +1311,90 @@ namespace stdex
return str; return str;
} }
/// \cond internal
inline size_t strftime(_Out_z_cap_(capacity) char *str, _In_ size_t capacity, _In_z_ _Printf_format_string_ const char *format, _In_ const struct tm* time, _In_opt_ locale_t locale)
{
#ifdef _WIN32
return _strftime_l(str, capacity, format, time, locale);
#else
return strftime_l(str, capacity, format, time, locale);
#endif
}
inline size_t strftime(_Out_z_cap_(capacity) wchar_t *str, _In_ size_t capacity, _In_z_ _Printf_format_string_ const wchar_t *format, _In_ const struct tm* time, _In_opt_ locale_t locale)
{
#ifdef _WIN32
return _wcsftime_l(str, capacity, format, time, locale);
#else
return wcsftime_l(str, capacity, format, time, locale);
#endif
}
/// \endcond
///
/// Formats a time string using `strftime()`.
///
/// \param[out] str String to append formatted time text
/// \param[in ] format String template using `strftime()` style
/// \param[in ] time Time
/// \param[in ] locale Stdlib locale used to perform formatting. Use `NULL` to use locale globally set by `setlocale()`.
///
template<class _Elem, class _Traits, class _Ax>
inline void strcatftime(_Inout_ std::basic_string<_Elem, _Traits, _Ax> &str, _In_z_ _Printf_format_string_ const _Elem *format, _In_ const struct tm* time, _In_opt_ locale_t locale)
{
_Elem buf[1024/sizeof(_Elem)];
// Try with stack buffer first.
size_t count = strftime(buf, _countof(buf), format, time, locale);
if (count) {
// Copy from stack.
str.append(buf, count);
} else {
for (size_t capacity = 2*1024/sizeof(_Elem);; capacity *= 2) {
// Allocate on heap and retry.
auto buf_dyn = std::make_unique<_Elem[]>(capacity);
count = strftime(buf_dyn.get(), capacity, format, time, locale);
if (count) {
str.append(buf_dyn.get(), count);
break;
}
}
}
}
///
/// Formats a time string using `strftime()`.
///
/// \param[out] str String to set formatted time text to
/// \param[in ] format String template using `strftime()` style
/// \param[in ] time Time
/// \param[in ] locale Stdlib locale used to perform formatting. Use `NULL` to use locale globally set by `setlocale()`.
///
template<class _Elem, class _Traits, class _Ax>
inline void strftime(_Inout_ std::basic_string<_Elem, _Traits, _Ax> &str, _In_z_ _Printf_format_string_ const _Elem *format, _In_ const struct tm* time, _In_opt_ locale_t locale)
{
str.clear();
strcatftime(str, format, time, locale);
}
///
/// Formats a time string using `strftime()`.
///
/// \param[out] str String to append formatted time text
/// \param[in ] format String template using `strftime()` style
/// \param[in ] time Time
/// \param[in ] locale Stdlib locale used to perform formatting. Use `NULL` to use locale globally set by `setlocale()`.
///
/// \returns Formatted string
///
template<class _Elem, class _Traits = std::char_traits<_Elem>, class _Ax = std::allocator<_Elem>>
inline std::basic_string<_Elem, _Traits, _Ax> strftime(_In_z_ _Printf_format_string_ const _Elem *format, _In_ const struct tm* time, _In_opt_ locale_t locale)
{
std::basic_string<_Elem, _Traits, _Ax> str;
strcatftime(str, format, time, locale);
return str;
}
/// ///
/// Convert string to lower-case character-by-character /// Convert string to lower-case character-by-character
/// ///