libowfat/mult/imult16.c

#if defined(__GNUC__) && (__GNUC__ >= 5)

#include "uint16.h"

int imult16( int16 a, int16 b, int16* c) { return !__builtin_mul_overflow(a,b,c); }

#else

#include "safemult.h"

int imult16(int16 a,int16 b,int16* c) {
  int32 x=(int32)a*b;
  if ((int16)x != x) return 0;
  *c=x;
  return 1;
}

#endif
support gcc 5 builtins for multiplication overflow in safemult.h fix copypasted comment in fmt_asn1dertag add man pages for add_of, sub_of and assign 2015-09-29 14:42:40 +00:00			`#if defined(__GNUC__) && (__GNUC__ >= 5)`

			`#include "uint16.h"`

			`int imult16( int16 a, int16 b, int16* c) { return !__builtin_mul_overflow(a,b,c); }`

			`#else`

add API for integer multiplication with overflow detection 2003-08-22 15:03:10 +00:00			`#include "safemult.h"`

			`int imult16(int16 a,int16 b,int16* c) {`
turns out the imult routines (which I never used) were incorrect. Noted by Matthew Dempsky open_* from open.h now open in large file mode 2005-07-15 20:57:07 +00:00			`int32 x=(int32)a*b;`
			`if ((int16)x != x) return 0;`
			`*c=x;`
reverse return code for safemult API to conform to newer djb APIs 2003-09-05 21:25:51 +00:00			`return 1;`
add API for integer multiplication with overflow detection 2003-08-22 15:03:10 +00:00			`}`
support gcc 5 builtins for multiplication overflow in safemult.h fix copypasted comment in fmt_asn1dertag add man pages for add_of, sub_of and assign 2015-09-29 14:42:40 +00:00
			`#endif`