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Change the length of strings created from fixed-size buffers.

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Use the usual C rule for NUL-terminated strings instead of discarding all the
trailing NUL characters.

This was unexpected (as buffers in C code are not necessarily always padded
with NULs to their full length) and also inconsistent among languages as this
was only done for those of them using typemaps/strings.swg but not for C# or
Java, for example, which terminated the string at the first NUL even before
this change.

Notice that this patch couldn't use strlen() or wcslen() with possibly not
NUL-terminated strings, so we had to add [our own equivalents of] strnlen()
and wcsnlen() and use them instead. This required adding yet another parameter
to string typemap macros, so update the example using them accordingly too.
This commit is contained in:
Vadim Zeitlin 2013-12-18 01:28:32 +01:00 • committed by William S Fulton
commit 88a0e228a9
8 changed files with 75 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

13
Lib/typemaps/string.swg
View file

@ -17,8 +17,19 @@ SWIG_pchar_descriptor(void)
}
}
%fragment("SWIG_strnlen","header",fragment="SWIG_FromCharPtrAndSize") {
size_t
SWIG_strnlen(const char* s, size_t maxlen)
{
const char *p;
for (p = s; maxlen-- && *p; p++)
;
return p - s;
}
}
%include <typemaps/strings.swg>
%typemaps_string(%checkcode(STRING), %checkcode(CHAR),
char, Char, SWIG_AsCharPtrAndSize, SWIG_FromCharPtrAndSize, strlen,
char, Char, SWIG_AsCharPtrAndSize, SWIG_FromCharPtrAndSize,
strlen, SWIG_strnlen,
"<limits.h>", CHAR_MIN, CHAR_MAX)

42
Lib/typemaps/strings.swg
View file

@ -22,6 +22,7 @@
SWIG_AsCharPtrAndSize,
SWIG_FromCharPtrAndSize,
SWIG_CharPtrLen,
SWIG_CharBufLen,
SWIG_AsCharPtr,
SWIG_FromCharPtr,
SWIG_AsCharArray,
@ -276,12 +277,13 @@
}
%typemap(freearg) const Char (&)[ANY] "";
%typemap(out,fragment=#SWIG_FromCharPtrAndSize)
%typemap(out,fragment=#SWIG_FromCharPtrAndSize,fragment=#SWIG_CharBufLen)
Char [ANY], const Char[ANY]
{
size_t size = $1_dim0;
%#ifndef SWIG_PRESERVE_CARRAY_SIZE
while (size && ($1[size - 1] == '\0')) --size;
size_t size = SWIG_CharBufLen($1, $1_dim0);
%#else
size_t size = $1_dim0;
%#endif
%set_output(SWIG_FromCharPtrAndSize($1, size));
}
@ -298,23 +300,25 @@
/* varout */
%typemap(varout,noblock=1,fragment=#SWIG_FromCharPtrAndSize)
%typemap(varout,noblock=1,fragment=#SWIG_CharBufLen)
Char [ANY], const Char [ANY] {
size_t size = $1_dim0;
%#ifndef SWIG_PRESERVE_CARRAY_SIZE
while (size && ($1[size - 1] == '\0')) --size;
size_t size = SWIG_CharBufLen($1, $1_dim0);
%#else
size_t size = $1_dim0;
%#endif
%set_varoutput(SWIG_FromCharPtrAndSize($1, size));
}
/* constant */
%typemap(constcode,fragment=#SWIG_FromCharPtrAndSize)
%typemap(constcode,fragment=#SWIG_CharBufLen)
Char [ANY], const Char [ANY]
{
size_t size = $value_dim0;
%#ifndef SWIG_PRESERVE_CARRAY_SIZE
while (size && ($value[size - 1] == '\0')) --size;
size_t size = SWIG_CharBufLen($1, $1_dim0);
%#else
size_t size = $value_dim0;
%#endif
%set_constant("$symname", SWIG_FromCharPtrAndSize($value,size));
}
@ -323,12 +327,13 @@
#if defined(SWIG_DIRECTOR_TYPEMAPS)
/* directorin */
%typemap(directorin,fragment=#SWIG_FromCharPtrAndSize)
%typemap(directorin,fragment=#SWIG_CharBufLen)
Char [ANY], const Char [ANY]
{
size_t size = $1_dim0;
%#ifndef SWIG_PRESERVE_CARRAY_SIZE
while (size && ($1[size - 1] == '\0')) --size;
size_t size = SWIG_CharBufLen($1, $1_dim0);
%#else
size_t size = $1_dim0;
%#endif
$input = SWIG_FromCharPtrAndSize($1, size);
}
@ -360,12 +365,13 @@
/* throws */
%typemap(throws,fragment=#SWIG_FromCharPtrAndSize)
%typemap(throws,fragment=#SWIG_CharBufLen)
Char [ANY], const Char[ANY]
{
size_t size = $1_dim0;
%#ifndef SWIG_PRESERVE_CARRAY_SIZE
while (size && ($1[size - 1] == '\0')) --size;
size_t size = SWIG_CharBufLen($1, $1_dim0);
%#else
size_t size = $1_dim0;
%#endif
%raise(SWIG_FromCharPtrAndSize($1, size), "$type", 0);
}
@ -499,6 +505,7 @@
SWIG_AsCharPtrAndSize,
SWIG_FromCharPtrAndSize,
SWIG_CharPtrLen,
SWIG_CharBufLen,
SWIG_NewCopyCharArray,
SWIG_DeleteCharArray,
FragLimits, CHAR_MIN, CHAR_MAX)
@ -586,6 +593,7 @@ SWIG_AsVal_dec(Char)(SWIG_Object obj, Char *val)
SWIG_AsCharPtrAndSize,
SWIG_FromCharPtrAndSize,
SWIG_CharPtrLen,
SWIG_CharBufLen,
SWIG_As##CharName##Ptr,
SWIG_From##CharName##Ptr,
SWIG_As##CharName##Array,
@ -604,12 +612,14 @@ SWIG_AsVal_dec(Char)(SWIG_Object obj, Char *val)
SWIG_AsCharPtrAndSize,
SWIG_FromCharPtrAndSize,
SWIG_CharPtrLen,
SWIG_CharBufLen,
FragLimits, CHAR_MIN, CHAR_MAX)
%_typemap2_string(StringCode, CharCode,
Char, CharName,
SWIG_AsCharPtrAndSize,
SWIG_FromCharPtrAndSize,
SWIG_CharPtrLen,
SWIG_CharBufLen,
%new_copy_array,
%delete_array,
FragLimits, CHAR_MIN, CHAR_MAX)
@ -624,6 +634,7 @@ SWIG_AsVal_dec(Char)(SWIG_Object obj, Char *val)
SWIG_AsCharPtrAndSize,
SWIG_FromCharPtrAndSize,
SWIG_CharPtrLen,
SWIG_CharBufLen,
SWIG_NewCopyCharArray,
SWIG_DeleteCharArray,
FragLimits, CHAR_MIN, CHAR_MAX)
@ -632,6 +643,7 @@ SWIG_AsVal_dec(Char)(SWIG_Object obj, Char *val)
SWIG_AsCharPtrAndSize,
SWIG_FromCharPtrAndSize,
SWIG_CharPtrLen,
SWIG_CharBufLen,
SWIG_NewCopyCharArray,
SWIG_DeleteCharArray,
FragLimits, CHAR_MIN, CHAR_MAX)

14
Lib/typemaps/wstring.swg
View file

@ -18,8 +18,20 @@ SWIG_pwchar_descriptor()
}
}
%fragment("SWIG_wcsnlen","header",fragment="SWIG_FromWCharPtrAndSize") {
size_t
SWIG_wcsnlen(const wchar_t* s, size_t maxlen)
{
const wchar_t *p;
for (p = s; maxlen-- && *p; p++)
;
return p - s;
}
}
%include <typemaps/strings.swg>
%typemaps_string(%checkcode(UNISTRING), %checkcode(UNICHAR),
wchar_t, WChar, SWIG_AsWCharPtrAndSize, SWIG_FromWCharPtrAndSize, wcslen,
wchar_t, WChar, SWIG_AsWCharPtrAndSize, SWIG_FromWCharPtrAndSize,
wcslen, SWIG_wcsnlen,
"<wchar.h>", WCHAR_MIN, WCHAR_MAX)