60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* PR c/85931 - -Wsizeof-pointer-memaccess for strncpy with size of source
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{ dg-do compile }
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{ dg-require-effective-target alloca }
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{ dg-options "-O2 -Wall -Wstringop-truncation -ftrack-macro-expansion=0" } */
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typedef __SIZE_TYPE__ size_t;
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extern char* strncpy (char*, const char*, size_t);
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extern char a3[3], b3[3];
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extern char a5[5], b5[5];
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extern char ax[], bx[];
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struct SA
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{
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char a3[3], b3[3];
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char a5[5], b5[5];
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char ax[];
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};
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void sink (void*, ...);
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#define T(d, s, n) sink (strncpy (d, s, n))
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void test_array (unsigned n)
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{
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T (a3, b3, 3);
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/* For the following statemenmt, GCC 8.1 issues warning:
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argument to ‘sizeof’ in ‘strncpy’ call is the same expression
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as the source; did you mean to use the size of the destination?
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Since the size of both the source and destination the warning
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isn't helpful. Verify that it isn't issued. */
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T (a3, b3, sizeof b3); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */
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T (a3, ax, sizeof a3); /* { dg-warning "\\\[-Wstringop-truncation" } */
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T (ax, a3, sizeof a3); /* { dg-warning "argument to .sizeof. in .strncpy. call is the same expression as the source" } */
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char an[n], bn[n];
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sink (an, bn);
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T (an, bn, sizeof bn); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */
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}
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void test_member_array (struct SA *sa, unsigned n)
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{
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T (sa->a3, sa->b3, 3);
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T (sa->a3, sa->b3, sizeof sa->b3); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */
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T (sa->a3, sa->ax, sizeof sa->a3); /* { dg-warning "\\\[-Wstringop-truncation" } */
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T (sa->ax, sa->a3, sizeof sa->a3); /* { dg-warning "argument to .sizeof. in .strncpy. call is the same expression as the source" } */
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struct VarLenStruct {
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char an[n], bn[n];
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} x;
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sink (&x);
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T (x.an, x.bn, sizeof x.bn); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */
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}
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