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// -*- C++ -*-
//===----------------------- support/win32/support.h ----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include <cstdarg> // va_start, va_end
#include <cstddef> // size_t
#include <cstdlib> // malloc
#include <cstdio> // vsprintf, vsnprintf
#include <cstring> // strcpy, wcsncpy
#include <cwchar> // mbstate_t
// Some of these functions aren't standard or if they conform, the name does not.
int asprintf(char **sptr, const char *__restrict format, ...)
{
va_list ap;
va_start(ap, format);
int result;
result = vasprintf(sptr, format, ap);
va_end(ap);
return result;
}
// Like sprintf, but when return value >= 0 it returns
// a pointer to a malloc'd string in *sptr.
// If return >= 0, use free to delete *sptr.
int vasprintf( char **sptr, const char *__restrict format, va_list ap )
{
*sptr = NULL;
// Query the count required.
int count = _vsnprintf( NULL, 0, format, ap );
if (count < 0)
return count;
size_t buffer_size = static_cast<size_t>(count) + 1;
char* p = static_cast<char*>(malloc(buffer_size));
if ( ! p )
return -1;
// If we haven't used exactly what was required, something is wrong.
// Maybe bug in vsnprintf. Report the error and return.
if (_vsnprintf(p, buffer_size, format, ap) != count) {
free(p);
return -1;
}
// All good. This is returning memory to the caller not freeing it.
*sptr = p;
return count;
}
// Returns >= 0: the number of wide characters found in the
// multi byte sequence src (of src_size_bytes), that fit in the buffer dst
// (of max_dest_chars elements size). The count returned excludes the
// null terminator. When dst is NULL, no characters are copied
// and no "out" parameters are updated.
// Returns (size_t) -1: an incomplete sequence encountered.
// Leaves *src pointing the next character to convert or NULL
// if a null character was converted from *src.
size_t mbsnrtowcs( wchar_t *__restrict dst, const char **__restrict src,
size_t src_size_bytes, size_t max_dest_chars, mbstate_t *__restrict ps )
{
const size_t terminated_sequence = static_cast<size_t>(0);
//const size_t invalid_sequence = static_cast<size_t>(-1);
const size_t incomplete_sequence = static_cast< size_t>(-2);
size_t dest_converted = 0;
size_t source_converted = 0;
size_t source_remaining = src_size_bytes;
size_t result = 0;
bool have_result = false;
while ( source_remaining ) {
if ( dst && dest_converted >= max_dest_chars )
break;
// Converts one multi byte character.
// if result > 0, it's the size in bytes of that character.
// othewise if result is zero it indicates the null character has been found.
// otherwise it's an error and errno may be set.
size_t char_size = mbrtowc( dst ? dst + dest_converted : NULL, *src + source_converted, source_remaining, ps );
// Don't do anything to change errno from here on.
if ( char_size > 0 ) {
source_remaining -= char_size;
source_converted += char_size;
++dest_converted;
continue;
}
result = char_size;
have_result = true;
break;
}
if ( dst ) {
if ( have_result && result == terminated_sequence )
*src = NULL;
else
*src += source_converted;
}
if ( have_result && result != terminated_sequence && result != incomplete_sequence )
return static_cast<size_t>(-1);
return dest_converted;
}
// Converts max_source_chars from the wide character buffer pointer to by *src,
// into the multi byte character sequence buffer stored at dst which must be
// dst_size_bytes bytes in size.
// Returns >= 0: the number of bytes in the sequence
// converted from *src, excluding the null terminator.
// Returns size_t(-1) if an error occurs, also sets errno.
// If dst is NULL dst_size_bytes is ignored and no bytes are copied to dst
// and no "out" parameters are updated.
size_t wcsnrtombs( char *__restrict dst, const wchar_t **__restrict src,
size_t max_source_chars, size_t dst_size_bytes, mbstate_t *__restrict ps )
{
//const size_t invalid_sequence = static_cast<size_t>(-1);
size_t source_converted = 0;
size_t dest_converted = 0;
size_t dest_remaining = dst_size_bytes;
size_t char_size = 0;
const errno_t no_error = ( errno_t) 0;
errno_t result = ( errno_t ) 0;
bool have_result = false;
bool terminator_found = false;
while ( source_converted != max_source_chars ) {
if ( ! dest_remaining )
break;
wchar_t c = (*src)[source_converted];
if ( dst )
result = wcrtomb_s( &char_size, dst + dest_converted, dest_remaining, c, ps);
else
result = wcrtomb_s( &char_size, NULL, 0, c, ps);
// If result is zero there is no error and char_size contains the
// size of the multi-byte-sequence converted.
// Otherwise result indicates an errno type error.
if ( result == no_error ) {
if ( c == L'\0' ) {
terminator_found = true;
break;
}
++source_converted;
if ( dst )
dest_remaining -= char_size;
dest_converted += char_size;
continue;
}
have_result = true;
break;
}
if ( dst ) {
if ( terminator_found )
*src = NULL;
else
*src = *src + source_converted;
}
if ( have_result && result != no_error ) {
errno = result;
return static_cast<size_t>(-1);
}
return dest_converted;
}
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