imacarthur wrote:
> On 30 Dec 2009, at 19:24, Greg Ercolano wrote:
>> Solution on win32 is to change _snprintf() to _snprintf_s()
>> with the _TRUNCATE macro as the third argument. But there's no
>> clear way to use a macro shortcut to do this (since this is a
>> varargs function), so a cross platform solution is tricky at best.
>
> Well, if we can assume C99 compliance (I'm not sure that we can) and
> that the C++ compiler also supports variadic macros (most do, but it
> is not part of any C++ spec yet, AFAIK...)
>
> Then, something like:
>
> #ifdef WIN32
> # define SNPRINTF(SS, CC, ...) snprintf(SS, CC, _TRUNCATE, __VA_ARGS__)
> #else
> # define SNPRINTF(SS, CC, ...) snprintf(SS, CC, __VA_ARGS__)
> #endif
If that flies on all the win32 compilers we support,
that'd be great.. I'm just not sure it is either.
One change to the above, though:
BEFORE: #define SNPRINTF(SS, CC, ...) snprintf(SS, CC, _TRUNCATE, __VA_ARGS__)
AFTER: #define SNPRINTF(SS, CC, ...) _snprintf_s(SS, CC, _TRUNCATE,
__VA_ARGS__)
^^^^^^^^^^^
Gotta have that leading "_" and trailing "_s" on the name for it to
work,
as it's a different function.
I just tried the following with the test program on 2008 VS Express
and it worked correctly, eg:
#include <stdio.h>
#include <string.h>
#ifdef _WIN32
#define snprintf(SS, CC, ...) _snprintf_s(SS, CC, _TRUNCATE, __VA_ARGS__)
// ADDED THIS
#endif /*MICROSOFT*/
int main() {
int ret;
char ss[20];
strcpy(ss, "12345678XY"); // 'X' and 'Y' should never be touched or seen
in the following
ret=snprintf(ss, 8, "1234%s","56"); fprintf(stderr,"RET=%d, SS='%s':
TEST RESULT: %s\n", ret, ss,
(ss[8]=='X'&&ss[9]=='Y'&&strlen(ss)<8)?"OK":"FAIL!");
ret=snprintf(ss, 8, "1234%s","567"); fprintf(stderr,"RET=%d, SS='%s':
TEST RESULT: %s\n", ret, ss,
(ss[8]=='X'&&ss[9]=='Y'&&strlen(ss)<8)?"OK":"FAIL!");
ret=snprintf(ss, 8, "1234%s","5678"); fprintf(stderr,"RET=%d, SS='%s':
TEST RESULT: %s\n", ret, ss,
(ss[8]=='X'&&ss[9]=='Y'&&strlen(ss)<8)?"OK":"FAIL!");
ret=snprintf(ss, 8, "1234%s","56789"); fprintf(stderr,"RET=%d, SS='%s':
TEST RESULT: %s\n", ret, ss,
(ss[8]=='X'&&ss[9]=='Y'&&strlen(ss)<8)?"OK":"FAIL!");
ret=snprintf(ss, 8, "1234%s","567890"); fprintf(stderr,"RET=%d, SS='%s':
TEST RESULT: %s\n", ret, ss,
(ss[8]=='X'&&ss[9]=='Y'&&strlen(ss)<8)?"OK":"FAIL!");
return(0);
}
..and the output on win32 was just like linux, making the above code
cross platform compilable:
Z:\erco\examples\c>.\test-snprintf_s
RET=6, SS='123456': TEST RESULT: OK
RET=7, SS='1234567': TEST RESULT: OK
RET=-1, SS='1234567': TEST RESULT: OK
RET=-1, SS='1234567': TEST RESULT: OK
RET=-1, SS='1234567': TEST RESULT: OK
Sweet!
Should I make an STR?
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