modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/builtins/fputs.c (about)

     1  /* Copyright (C) 2000, 2001  Free Software Foundation.
     2  
     3     Ensure all expected transformations of builtin fputs occur and that
     4     we honor side effects in the stream argument.
     5  
     6     Written by Kaveh R. Ghazi, 10/30/2000.  */
     7  
     8  #include <stdio.h>
     9  extern void abort(void);
    10  
    11  int i;
    12  
    13  void
    14  main_test(void)
    15  {
    16    FILE *s_array[] = {stdout, NULL}, **s_ptr = s_array;
    17    const char *const s1 = "hello world";
    18    
    19    fputs ("", *s_ptr);
    20    fputs ("\n", *s_ptr);
    21    fputs ("bye", *s_ptr);
    22    fputs (s1, *s_ptr);
    23    fputs (s1+5, *s_ptr);
    24    fputs (s1+10, *s_ptr);
    25    fputs (s1+11, *s_ptr);
    26    
    27    /* Check side-effects when transforming fputs -> NOP.  */
    28    fputs ("", *s_ptr++);
    29    if (s_ptr != s_array+1 || *s_ptr != 0)
    30      abort();
    31  
    32    /* Check side-effects when transforming fputs -> fputc.  */
    33    s_ptr = s_array;
    34    fputs ("\n", *s_ptr++);
    35    if (s_ptr != s_array+1 || *s_ptr != 0)
    36      abort();
    37  
    38    /* Check side-effects when transforming fputs -> fwrite.  */
    39    s_ptr = s_array;
    40    fputs ("hello\n", *s_ptr++);
    41    if (s_ptr != s_array+1 || *s_ptr != 0)
    42      abort();
    43  
    44    /* Test at least one instance of the __builtin_ style.  We do this
    45       to ensure that it works and that the prototype is correct.  */
    46    s_ptr = s_array;
    47    __builtin_fputs ("", *s_ptr);
    48    /* These builtin stubs are called by __builtin_fputs, ensure their
    49       prototypes are set correctly too.  */
    50    __builtin_fputc ('\n', *s_ptr);
    51    __builtin_fwrite ("hello\n", 1, 6, *s_ptr);
    52    /* Check the unlocked style, these evaluate to nothing to avoid
    53       problems on systems without the unlocked functions.  */
    54    fputs_unlocked ("", *s_ptr);
    55    __builtin_fputs_unlocked ("", *s_ptr);
    56  
    57    /* Check side-effects in conditional expression.  */
    58    s_ptr = s_array;
    59    fputs (i++ ? "f" : "x", *s_ptr++);
    60    if (s_ptr != s_array+1 || *s_ptr != 0 || i != 1)
    61      abort();
    62    fputs (--i ? "\n" : "\n", *--s_ptr);
    63    if (s_ptr != s_array || i != 0)
    64      abort();
    65  }