libowfat/mult/umult32.c

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

#include "uint32.h"

int umult32(uint32 a,uint32 b,uint32* c) { return !__builtin_mul_overflow(a,b,c); }

#else

#include "safemult.h"

int umult32(uint32 a,uint32 b,uint32* c) {
  unsigned long long x=(unsigned long long)a*b;
  if (x>0xffffffff) return 0;
  *c=x&0xffffffff;
  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 "uint32.h"`

			`int umult32(uint32 a,uint32 b,uint32* 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 umult32(uint32 a,uint32 b,uint32* c) {`
			`unsigned long long x=(unsigned long long)a*b;`
reverse return code for safemult API to conform to newer djb APIs 2003-09-05 21:25:51 +00:00			`if (x>0xffffffff) return 0;`
add API for integer multiplication with overflow detection 2003-08-22 15:03:10 +00:00			`*c=x&0xffffffff;`
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`