Defect Report #080
Submission Date: 03 Dec 93
Source: Clive Feather
Item 17 - merging of string constants
Consider the following code:
char *s1 = "abcde" + 2;
char *s2 = "cde";
Can the expression (s1 == s2) be non-zero? Is the answer different
if the first string literal is replaced by the two literals "ab"
"cde" (because then there are identical string literals)?
When the last paragraph of subclause 6.1.4 refers to ``string
literals'' it is referring to the static arrays created in
translation phase 7 as specified in the previous paragraph. Although
the current wording of the C Standard may imply that only
completely identical arrays need not be distinct, this was not
the Committee's intent.
In subclause 6.1.4, page 31, change the last paragraph of Semantics
(before the Example) from:
Identical string literals of either form need not be distinct.
If the program attempts to modify a string literal of either form,
the behavior is undefined.
These arrays need not be distinct provided their elements
have the appropriate values. If the program attempts to modify
such an array, the behavior is undefined.
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