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69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
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/*
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* wcsftime.c
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* Original Author: Craig Howland, for Newlib
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*
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* Source actually uses strftime.c.
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* Documentation for wcsftime() here, with minimal overlap.
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*/
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/*
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FUNCTION
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<<wcsftime>>--convert date and time to a formatted wide-character string
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INDEX
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wcsftime
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ANSI_SYNOPSIS
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#include <time.h>
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#include <wchar.h>
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size_t wcsftime(wchar_t *<[s]>, size_t <[maxsize]>,
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const wchar_t *<[format]>, const struct tm *<[timp]>);
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DESCRIPTION
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<<wcsftime>> is equivalent to <<strftime>>, except that:
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O+
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o The argument s points to the initial element of an array of wide characters
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into which the generated output is to be placed.
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o The argument maxsize indicates the limiting number of wide characters.
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o The argument format is a wide-character string and the conversion specifiers
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are replaced by corresponding sequences of wide characters.
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o The return value indicates the number of wide characters.
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O-
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(The difference in all of the above being wide characters versus regular
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characters.)
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See <<strftime>> for the details of the format specifiers.
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RETURNS
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When the formatted time takes up no more than <[maxsize]> wide characters,
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the result is the length of the formatted wide string. Otherwise, if the
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formatting operation was abandoned due to lack of room, the result is
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<<0>>, and the wide-character string starting at <[s]> corresponds to just those
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parts of <<*<[format]>>> that could be completely filled in within the
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<[maxsize]> limit.
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PORTABILITY
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C99 and POSIX require <<wcsftime>>, but do not specify the contents of
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<<*<[s]>>> when the formatted string would require more than
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<[maxsize]> characters. Unrecognized specifiers and fields of
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<<timp>> that are out of range cause undefined results. Since some
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formats expand to 0 bytes, it is wise to set <<*<[s]>>> to a nonzero
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value beforehand to distinguish between failure and an empty string.
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This implementation does not support <<s>> being NULL, nor overlapping
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<<s>> and <<format>>.
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<<wcsftime>> requires no supporting OS subroutines.
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SEEALSO
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<<strftime>>
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*/
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#include <time.h>
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#include <wchar.h>
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#define MAKE_WCSFTIME
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#include "../time/strftime.c"
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