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lib: add FMT_NSTD() for non-standard printf exts

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... to suppress the warnings when using something that isn't quite ISO C
compatible and would otherwise cause compiler warnings from `-Wformat`.

Signed-off-by: David Lamparter <equinox@diac24.net>
This commit is contained in:
David Lamparter 2021-03-26 18:11:21 +01:00
parent 2d9a4e2931
commit cb4928ce77
2 changed files with 28 additions and 2 deletions
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25
lib/printfrr.h
View File

@ -251,6 +251,31 @@ static inline ssize_t bputch(struct fbuf *buf, char ch)
return 1;
}
/* when using non-ISO-C compatible extension specifiers... */
#ifdef _FRR_ATTRIBUTE_PRINTFRR
#define FMT_NSTD_BEGIN
#define FMT_NSTD_END
#else /* !_FRR_ATTRIBUTE_PRINTFRR */
#define FMT_NSTD_BEGIN \
_Pragma("GCC diagnostic push") \
_Pragma("GCC diagnostic ignored \"-Wformat\"") \
/* end */
#define FMT_NSTD_END \
_Pragma("GCC diagnostic pop") \
/* end */
#endif
#define FMT_NSTD(expr) \
({ \
typeof(expr) _v; \
FMT_NSTD_BEGIN \
_v = expr; \
FMT_NSTD_END \
_v; \
}) \
/* end */
#ifdef __cplusplus
}
#endif

5
tests/lib/test_printfrr.c
View File

@ -59,8 +59,8 @@ static void printcmp(const char *fmt, ...)
errors++;
}
static void printchk(const char *ref, const char *fmt, ...) PRINTFRR(2, 3);
static void printchk(const char *ref, const char *fmt, ...)
static int printchk(const char *ref, const char *fmt, ...) PRINTFRR(2, 3);
static int printchk(const char *ref, const char *fmt, ...)
{
va_list ap;
char bufrr[256];
@ -125,6 +125,7 @@ static void printchk(const char *ref, const char *fmt, ...)
(int)(outpos[i].off_end - outpos[i].off_start),
bufrr + outpos[i].off_start);
printf("\n");
return 0;
}
int main(int argc, char **argv)