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/* Copyright (C) 2004, 2005  Free Software Foundation.

   Ensure builtin __strncpy_chk performs correctly.  */

extern void abort (void);

typedef __SIZE_TYPE__ size_t;

extern size_t strlen(const char *);

extern void *memcpy (void *, const void *, size_t);

extern char *strncpy (char *, const char *, size_t);

extern int memcmp (const void *, const void *, size_t);

extern int strcmp (const char *, const char *);

extern int strncmp (const char *, const char *, size_t);

extern void *memset (void *, int, size_t);

#include "chk.h"

const char s1[] = "123";

char p[32] = "";

char * volatile s2 = "defg";  /* prevent constant propagation to happen when whole program assumptions are made.  */

char * volatile s3 = "FGH";  /* prevent constant propagation to happen when whole program assumptions are made.  */

char *s4;

volatile size_t l1 = 1;  /* prevent constant propagation to happen when whole program assumptions are made.  */

int i;

void

__attribute__((noinline))

test1 (void)

{

  const char *const src = "hello world";

  const char *src2;

  char dst[64], *dst2;

  strncpy_disallowed = 1;

  chk_calls = 0;

  memset (dst, 0, sizeof (dst));

  if (strncpy (dst, src, 4) != dst || strncmp (dst, src, 4))

    abort();

  memset (dst, 0, sizeof (dst));

  if (strncpy (dst+16, src, 4) != dst+16 || strncmp (dst+16, src, 4))

    abort();

  memset (dst, 0, sizeof (dst));

  if (strncpy (dst+32, src+5, 4) != dst+32 || strncmp (dst+32, src+5, 4))

    abort();

  memset (dst, 0, sizeof (dst));

  dst2 = dst;

  if (strncpy (++dst2, src+5, 4) != dst+1 || strncmp (dst2, src+5, 4)

      || dst2 != dst+1)

    abort();

  memset (dst, 0, sizeof (dst));

  if (strncpy (dst, src, 0) != dst || strcmp (dst, ""))

    abort();

  memset (dst, 0, sizeof (dst));

  dst2 = dst; src2 = src;

  if (strncpy (++dst2, ++src2, 0) != dst+1 || strcmp (dst2, "")

      || dst2 != dst+1 || src2 != src+1)

    abort();

  memset (dst, 0, sizeof (dst));

  dst2 = dst; src2 = src;

  if (strncpy (++dst2+5, ++src2+5, 0) != dst+6 || strcmp (dst2+5, "")

      || dst2 != dst+1 || src2 != src+1)

    abort();

  memset (dst, 0, sizeof (dst));

  if (strncpy (dst, src, 12) != dst || strcmp (dst, src))

    abort();

  /* Test at least one instance of the __builtin_ style.  We do this

     to ensure that it works and that the prototype is correct.  */

  memset (dst, 0, sizeof (dst));

  if (__builtin_strncpy (dst, src, 4) != dst || strncmp (dst, src, 4))

    abort();

  memset (dst, 0, sizeof (dst));

  if (strncpy (dst, i++ ? "xfoo" + 1 : "bar", 4) != dst

      || strcmp (dst, "bar")

      || i != 1)

    abort ();

  if (chk_calls)

    abort ();

  strncpy_disallowed = 0;

}

void

__attribute__((noinline))

test2 (void)

{

  chk_calls = 0;

  /* No runtime checking should be done here, both destination

     and length are unknown.  */

  strncpy (s4, "abcd", l1 + 1);

  if (chk_calls)

    abort ();

}

/* Test whether compile time checking is done where it should

   and so is runtime object size checking.  */

void

__attribute__((noinline))

test3 (void)

{

  struct A { char buf1[10]; char buf2[10]; } a;

  char *r = l1 == 1 ? &a.buf1[5] : &a.buf2[4];

  char buf3[20];

  int i;

  const char *l;

  size_t l2;

  /* The following calls should do runtime checking

     - source length is not known, but destination is.  */

  chk_calls = 0;

  strncpy (a.buf1 + 2, s3 + 3, l1);

  strncpy (r, s3 + 2, l1 + 2);

  r = l1 == 1 ? __builtin_alloca (4) : &a.buf2[7];

  strncpy (r, s2 + 2, l1 + 2);

  strncpy (r + 2, s3 + 3, l1);

  r = buf3;

  for (i = 0; i < 4; ++i)

    {

      if (i == l1 - 1)

        r = &a.buf1[1];

      else if (i == l1)

        r = &a.buf2[7];

      else if (i == l1 + 1)

        r = &buf3[5];

      else if (i == l1 + 2)

        r = &a.buf1[9];

    }

  strncpy (r, s2 + 4, l1);

  if (chk_calls != 5)

    abort ();

  /* Following have known destination and known length,

     so if optimizing certainly shouldn't result in the checking

     variants.  */

  chk_calls = 0;

  strncpy (a.buf1 + 2, "", 3);

  strncpy (a.buf1 + 2, "", 0);

  strncpy (r, "a", 1);

  strncpy (r, "a", 3);

  r = l1 == 1 ? __builtin_alloca (4) : &a.buf2[7];

  strncpy (r, s1 + 1, 3);

  strncpy (r, s1 + 1, 2);

  r = buf3;

  l = "abc";

  l2 = 4;

  for (i = 0; i < 4; ++i)

    {

      if (i == l1 - 1)

        r = &a.buf1[1], l = "e", l2 = 2;

      else if (i == l1)

        r = &a.buf2[7], l = "gh", l2 = 3;

      else if (i == l1 + 1)

        r = &buf3[5], l = "jkl", l2 = 4;

      else if (i == l1 + 2)

        r = &a.buf1[9], l = "", l2 = 1;

    }

  strncpy (r, "", 1);

  /* Here, strlen (l) + 1 is known to be at most 4 and

     __builtin_object_size (&buf3[16], 0) is 4, so this doesn't need

     runtime checking.  */

  strncpy (&buf3[16], l, l2);

  strncpy (&buf3[15], "abc", l2);

  strncpy (&buf3[10], "fghij", l2);

  if (chk_calls)

    abort ();

  chk_calls = 0;

}

/* Test whether runtime and/or compile time checking catches

   buffer overflows.  */

void

__attribute__((noinline))

test4 (void)

{

  struct A { char buf1[10]; char buf2[10]; } a;

  char buf3[20];

  chk_fail_allowed = 1;

  /* Runtime checks.  */

  if (__builtin_setjmp (chk_fail_buf) == 0)

    {

      strncpy (&a.buf2[9], s2 + 4, l1 + 1);

      abort ();

    }

  if (__builtin_setjmp (chk_fail_buf) == 0)

    {

      strncpy (&a.buf2[7], s3, l1 + 4);

      abort ();

    }

  /* This should be detectable at compile time already.  */

  if (__builtin_setjmp (chk_fail_buf) == 0)

    {

      strncpy (&buf3[19], "abc", 2);

      abort ();

    }

  if (__builtin_setjmp (chk_fail_buf) == 0)

    {

      strncpy (&buf3[18], "", 3);

      abort ();

    }

  chk_fail_allowed = 0;

}

void

main_test (void)

{

#ifndef __OPTIMIZE__

  /* Object size checking is only intended for -O[s123].  */

  return;

#endif

  __asm ("" : "=r" (s2) : "0" (s2));

  __asm ("" : "=r" (s3) : "0" (s3));

  __asm ("" : "=r" (l1) : "0" (l1));

  test1 ();

  s4 = p;

  test2 ();

  test3 ();

  test4 ();

}