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If fortify is enabled, the truncated output warning is issued by
the wrapper itself:
bug-strncat1.c: In function ‘main’:
bug-strncat1.c:14:3: error: ‘__builtin___strncat_chk’ output truncated
copying 1 byte from a string of length 2 [-Werror=stringop-truncation]
14 | strncat (d, "\5\6", 1);
| ^
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
41 lines
771 B
C
41 lines
771 B
C
#undef __USE_STRING_INLINES
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#define __USE_STRING_INLINES
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#include <sys/cdefs.h>
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#include <libc-diag.h>
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#if __GNUC_PREREQ (8, 0)
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/* GCC warns about strncat truncating output; this is deliberately
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tested here. If fortify is enabled, it is also triggered by the
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wrappers. */
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DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-truncation");
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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char d[3] = "\0\1\2";
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int
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main (void)
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{
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DIAG_PUSH_NEEDS_COMMENT;
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strncat (d, "\5\6", 1);
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DIAG_POP_NEEDS_COMMENT;
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if (d[0] != '\5')
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{
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puts ("d[0] != '\\5'");
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exit (1);
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}
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if (d[1] != '\0')
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{
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puts ("d[1] != '\\0'");
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exit (1);
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}
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if (d[2] != '\2')
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{
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puts ("d[2] != '\\2'");
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exit (1);
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}
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return 0;
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}
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