string-9.c

来自「xml大全 可读写调用率很高 xml大全 可读写调用率很高」· C语言 代码 · 共 80 行

/* Copyright (C) 2000, 2003  Free Software Foundation.

   Ensure all expected transformations of builtin strcat occur and
   perform correctly.

   Written by Kaveh R. Ghazi, 11/27/2000.  */

extern int inside_main;
extern void abort (void);
typedef __SIZE_TYPE__ size_t;
extern char *strcat (char *, const char *);
extern char *strcpy (char *, const char *);
extern int strcmp (const char *, const char *);
extern void *memset (void *, int, size_t);
extern int memcmp (const void *, const void *, size_t);
#define RESET_DST_WITH(FILLER) \
  do { memset (dst, 'X', sizeof (dst)); strcpy (dst, (FILLER)); } while (0)

void main_test (void)
{
  const char *const s1 = "hello world";
  const char *const s2 = "";
  char dst[64], *d2;
  
  RESET_DST_WITH (s1);
  if (strcat (dst, "") != dst || strcmp (dst, s1))
    abort();
  RESET_DST_WITH (s1);
  if (strcat (dst, s2) != dst || strcmp (dst, s1))
    abort();
  RESET_DST_WITH (s1); d2 = dst;
  if (strcat (++d2, s2) != dst+1 || d2 != dst+1 || strcmp (dst, s1))
    abort();
  RESET_DST_WITH (s1); d2 = dst;
  if (strcat (++d2+5, s2) != dst+6 || d2 != dst+1 || strcmp (dst, s1))
    abort();
  RESET_DST_WITH (s1); d2 = dst;
  if (strcat (++d2+5, s1+11) != dst+6 || d2 != dst+1 || strcmp (dst, s1))
    abort();

#ifndef __OPTIMIZE_SIZE__
# if !defined __i386__ && !defined __x86_64__
  /* The functions below might not be optimized into direct stores on all
     arches.  It depends on how many instructions would be generated and
     what limits the architecture chooses in STORE_BY_PIECES_P.  */
  inside_main = 0;
# endif

  RESET_DST_WITH (s1);
  if (strcat (dst, " 1111") != dst
      || memcmp (dst, "hello world 1111\0XXX", 20))
    abort();
  
  RESET_DST_WITH (s1);
  if (strcat (dst+5, " 2222") != dst+5
      || memcmp (dst, "hello world 2222\0XXX", 20))
    abort();
  
  RESET_DST_WITH (s1); d2 = dst;
  if (strcat (++d2+5, " 3333") != dst+6 || d2 != dst+1
      || memcmp (dst, "hello world 3333\0XXX", 20))
    abort();
  
  RESET_DST_WITH (s1);
  strcat (strcat (strcat (strcat (strcat (strcat (dst, ": this "), ""),
				  "is "), "a "), "test"), ".");
  if (memcmp (dst, "hello world: this is a test.\0X", 30))
    abort();

  /* Set inside_main again.  */
  inside_main = 1;
#endif

  /* 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_WITH (s1);
  if (__builtin_strcat (dst, "") != dst || strcmp (dst, s1))
    abort();
}