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[Ada] Fix preconditions of Interfaces.C.Strings

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Preconditions of Update procedures were always true when Offset was 0.
The changes enable to protect from Update_Error when Offset is 0.

gcc/ada/

	* libgnat/i-cstrin.ads (Update): Update precondition.
This commit is contained in:
Joffrey Huguet 2022-05-12 11:53:54 +02:00 committed by Pierre-Marie de Rodat
parent 5987f43412
commit cfd2262668
1 changed files with 8 additions and 2 deletions
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10
gcc/ada/libgnat/i-cstrin.ads
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@ -120,7 +120,10 @@ is
with
Pre =>
Item /= Null_Ptr
and then (if Check then Offset <= Strlen (Item) - Chars'Length),
and then
(if Check then
Strlen (Item) <= size_t'Last - Offset
and then Strlen (Item) + Offset <= Chars'Length),
Global => (In_Out => C_Memory);
procedure Update
@ -131,7 +134,10 @@ is
with
Pre =>
Item /= Null_Ptr
and then (if Check then Offset <= Strlen (Item) - Str'Length),
and then
(if Check then
Strlen (Item) <= size_t'Last - Offset
and then Strlen (Item) + Offset <= Str'Length),
Global => (In_Out => C_Memory);
Update_Error : exception;