felixfoertsch/remind
1
0
Fork 0
mirror of https://salsa.debian.org/dskoll/remind.git synced 2026-04-16 06:18:47 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

Add overflow checks for unary minus.

Browse Source
This commit is contained in:
Dianne Skoll
2021-01-30 21:02:56 -05:00
parent 2123bf4b18
commit d667c15b25
3 changed files with 9 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/expr.c
View File

@@ -1145,7 +1145,9 @@ static int UnMinus(void)
{
Value *v = &ValStack[ValStackPtr-1];
if (v->type != INT_TYPE) return E_BAD_TYPE;
int old = v->v.val;
v->v.val = -v->v.val;
if (_private_unminus_overflow(old, v->v.val)) return E_2HIGH;
return OK;
}

1
src/expr.h
View File

@@ -57,3 +57,4 @@ else \
extern int _private_div(int a, int b);
extern int _private_add_overflow(int result, int b, int old);
extern int _private_sub_overflow(int result, int b, int old);
extern int _private_unminus_overflow(int a, int b);

6
src/utils.c
View File

@@ -140,3 +140,9 @@ int _private_sub_overflow(int result, int b, int old)
return 0;
}
int _private_unminus_overflow(int a, int b)
{
if (a > 0 && b > 0) return 1;
if (a < 0 && b < 0) return 1;
return 0;
}