derek.holloway
7502bf64a4
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38 lines
1.8 KiB
C
38 lines
1.8 KiB
C
// RUN: %clang_cc1 -std=c23 -triple x86_64 -verify -fsyntax-only -Wfortify-source -Wno-string-plus-int %s
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// RUN: %clang_cc1 -std=c23 -triple x86_64 -verify -fsyntax-only -Wfortify-source -Wno-string-plus-int -fexperimental-new-constant-interpreter %s
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void test(char *c) {
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// We test offsets 0 to 4.
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// 0: a no op of course
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// 1,2: these result in a different length string than the buffer size
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// 3: the last position: this hits ptr+object_size being a valid pointer,
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// but not dereferencable
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// 4: completely invalid pointer
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__builtin_strcat(c, "42" + 0);
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__builtin_strcat(c, "42" + 1);
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__builtin_strcat(c, "42" + 2);
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__builtin_strcat(c, "42" + 3);
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__builtin_strcat(c, "42" + 4);
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_Static_assert(__builtin_strlen("42" + 0) == 2);
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// A test without a null terminator, this captures incorrect size computation
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// and incorrectly specifying the buffer size to strlen.
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char buffer[1];
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static const char test_buffer[] = {'4','2'};
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__builtin_strcpy(buffer, test_buffer + 0);
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__builtin_strcpy(buffer, test_buffer + 1);
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// Note: these show that we will not issue a fortify warning when the source
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// buffer is not null terminated.
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__builtin_strcpy(buffer, test_buffer + 2);
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__builtin_strcpy(buffer, test_buffer + 3);
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// Verifying strlen computes from the correct starting point.
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_Static_assert(__builtin_strlen("42" + 1) == 1);
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_Static_assert(__builtin_strlen("42" + 2) == 0);
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_Static_assert(__builtin_strlen("42" + 3));
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// expected-error@-1 {{static assertion expression is not an integral constant expression}}
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_Static_assert(__builtin_strlen("42" + 4));
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// expected-error@-1 {{static assertion expression is not an integral constant expression}}
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// expected-note@-2 {{cannot refer to element 4 of array of 3 elements in a constant expression}}
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}
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