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//===----------------------------------------------------------------------===//
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#include <support/win32/support.h>
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#include <stdarg.h> // va_start, va_end
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#include <stddef.h> // size_t
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#include <stdlib.h> // malloc
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#include <stdio.h> // vsprintf, vsnprintf
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#include <string.h> // strcpy, wcsncpy
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int asprintf(char **sptr, const char *__restrict fmt, ...)
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#include <cstdarg> // va_start, va_end
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#include <cstddef> // size_t
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#include <cstdlib> // malloc
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#include <cstdio> // vsprintf, vsnprintf
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#include <cstring> // strcpy, wcsncpy
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#include <cwchar> // mbstate_t
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// Some of these functions aren't standard or if they conform, the name does not.
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int asprintf(char **sptr, const char *__restrict format, ...)
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int result = vasprintf(sptr, fmt, ap);
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result = vasprintf(sptr, format, ap);
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// Like sprintf, but when return value >= 0 it returns a pointer to a malloc'd string in *sptr.
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// Like sprintf, but when return value >= 0 it returns
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// a pointer to a malloc'd string in *sptr.
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// If return >= 0, use free to delete *sptr.
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int vasprintf( char **sptr, const char *__restrict fmt, va_list ap )
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int vasprintf( char **sptr, const char *__restrict format, va_list ap )
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int count = vsnprintf( NULL, 0, fmt, ap ); // Query the buffer size required.
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char* p = static_cast<char*>(malloc(count+1)); // Allocate memory for it and the terminator.
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if ( vsnprintf( p, count+1, fmt, ap ) == count ) // We should have used exactly what was required.
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else { // Otherwise something is wrong, likely a bug in vsnprintf. If so free the memory and report the error.
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// Query the count required.
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int count = _vsnprintf( NULL, 0, format, ap );
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size_t buffer_size = static_cast<size_t>(count) + 1;
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char* p = static_cast<char*>(malloc(buffer_size));
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// If we haven't used exactly what was required, something is wrong.
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// Maybe bug in vsnprintf. Report the error and return.
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if (_vsnprintf(p, buffer_size, format, ap) != count) {
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// All good. This is returning memory to the caller not freeing it.
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// Returns >= 0: the number of wide characters found in the multi byte sequence src (of src_size_bytes),
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// that fit in the buffer dst (of max_dest_chars elements size). The count returned excludes the null terminator.
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// When dst is NULL, no characters are copied and no "out" parameters are updated.
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// Returns >= 0: the number of wide characters found in the
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// multi byte sequence src (of src_size_bytes), that fit in the buffer dst
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// (of max_dest_chars elements size). The count returned excludes the
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// null terminator. When dst is NULL, no characters are copied
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// and no "out" parameters are updated.
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// Returns (size_t) -1: an incomplete sequence encountered.
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// Leaves *src pointing the next character to convert or NULL if a null character was converted from *src.
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// Leaves *src pointing the next character to convert or NULL
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// if a null character was converted from *src.
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size_t mbsnrtowcs( wchar_t *__restrict dst, const char **__restrict src,
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size_t src_size_bytes, size_t max_dest_chars, mbstate_t *__restrict ps )
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// Converts max_source_chars from the wide character buffer pointer to by *src,
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// into the multi byte character sequence buffer stored at dst which must be dst_size_bytes bytes in size.
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// Returns >= 0: the number of bytes in the sequence sequence converted frome *src, excluding the null terminator.
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// into the multi byte character sequence buffer stored at dst which must be
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// dst_size_bytes bytes in size.
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// Returns >= 0: the number of bytes in the sequence sequence
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// converted frome *src, excluding the null terminator.
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// Returns size_t(-1) if an error occurs, also sets errno.
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// If dst is NULL dst_size_bytes is ignored and no bytes are copied to dst and no "out" parameters are updated.
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// If dst is NULL dst_size_bytes is ignored and no bytes are copied to dst
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// and no "out" parameters are updated.
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size_t wcsnrtombs( char *__restrict dst, const wchar_t **__restrict src,
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size_t max_source_chars, size_t dst_size_bytes, mbstate_t *__restrict ps )
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result = wcrtomb_s( &char_size, dst + dest_converted, dest_remaining, c, ps);
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result = wcrtomb_s( &char_size, NULL, 0, c, ps);
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// If result is zero there is no error and char_size contains the size of the multi-byte-sequence converted.
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result = wcrtomb_s( &char_size, NULL, 0, c, ps);
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// If result is zero there is no error and char_size contains the
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// size of the multi-byte-sequence converted.
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// Otherwise result indicates an errno type error.
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if ( result == no_error ) {
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if ( c == L'\0' ) {
added
removed
libcxx/src/support/win32/support.cpp
