Viewing file:  strncpy.c (1.92 KB) -rw-r--r--
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/* Copyright (C) 2000, 2005 Free Software Foundation.
Ensure all expected transformations of builtin strncpy occur and
perform correctly.
Written by Kaveh R. Ghazi, 11/25/2000. */
extern void abort (void);
typedef __SIZE_TYPE__ size_t;
extern char *strncpy (char *, const char *, size_t);
extern int memcmp (const void *, const void *, size_t);
extern void *memset (void *, int, size_t);
/* Reset the destination buffer to a known state. */
#define RESET_DST memset(dst, 'X', sizeof(dst))
int i;
void
main_test (void)
{
const char *const src = "hello world";
const char *src2;
char dst[64], *dst2;
RESET_DST;
if (strncpy (dst, src, 4) != dst || memcmp (dst, "hellXXX", 7))
abort();
RESET_DST;
if (strncpy (dst+16, src, 4) != dst+16 || memcmp (dst+16, "hellXXX", 7))
abort();
RESET_DST;
if (strncpy (dst+32, src+5, 4) != dst+32 || memcmp (dst+32, " worXXX", 7))
abort();
RESET_DST;
dst2 = dst;
if (strncpy (++dst2, src+5, 4) != dst+1 || memcmp (dst2, " worXXX", 7)
|| dst2 != dst+1)
abort();
RESET_DST;
if (strncpy (dst, src, 0) != dst || memcmp (dst, "XXX", 3))
abort();
RESET_DST;
dst2 = dst; src2 = src;
if (strncpy (++dst2, ++src2, 0) != dst+1 || memcmp (dst2, "XXX", 3)
|| dst2 != dst+1 || src2 != src+1)
abort();
RESET_DST;
dst2 = dst; src2 = src;
if (strncpy (++dst2+5, ++src2+5, 0) != dst+6 || memcmp (dst2+5, "XXX", 3)
|| dst2 != dst+1 || src2 != src+1)
abort();
RESET_DST;
if (strncpy (dst, src, 12) != dst || memcmp (dst, "hello world\0XXX", 15))
abort();
/* Test at least one instance of the __builtin_ style. We do this
to ensure that it works and that the prototype is correct. */
RESET_DST;
if (__builtin_strncpy (dst, src, 4) != dst || memcmp (dst, "hellXXX", 7))
abort();
RESET_DST;
if (strncpy (dst, i++ ? "xfoo" + 1 : "bar", 4) != dst
|| memcmp (dst, "bar\0XXX", 7)
|| i != 1)
abort ();
}
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