gcc/testsuite/gcc.dg/format/ext-1.c

   1 /* Test for format extensions beyond the C standard and X/Open standard.
   2    Test for printf formats.
   3 */
   4 /* Origin: Joseph Myers <jsm28@cam.ac.uk> */
   5 /* { dg-do compile } */
   6 /* { dg-options "-std=gnu99 -Wformat" } */
   7
   8 #include "format.h"
   9
  10 void
  11 foo (quad_t q, u_quad_t uq, quad_t *qn, size_t z, size_t *zn, long long int ll,
  12      unsigned long long int ull, int i, unsigned int u, double d,
  13      char *s, void *p, wchar_t *ls, wint_t lc, int *n, long int l)
  14 {
  15   /* As an extension, GCC allows the BSD length "q" for integer formats.
  16      This is largely obsoleted in C99 by %j, %ll and PRId64.
  17   */
  18   printf ("%qd%qi%qo%qu%qx%qX%qn", q, q, uq, uq, uq, uq, qn);
  19   printf ("%qf", d); /* { dg-warning "length" "bad use of %q" } */
  20   printf ("%qF", d); /* { dg-warning "length" "bad use of %q" } */
  21   printf ("%qe", d); /* { dg-warning "length" "bad use of %q" } */
  22   printf ("%qE", d); /* { dg-warning "length" "bad use of %q" } */
  23   printf ("%qg", d); /* { dg-warning "length" "bad use of %q" } */
  24   printf ("%qG", d); /* { dg-warning "length" "bad use of %q" } */
  25   printf ("%qa", d); /* { dg-warning "length" "bad use of %q" } */
  26   printf ("%qA", d); /* { dg-warning "length" "bad use of %q" } */
  27   printf ("%qc", i); /* { dg-warning "length" "bad use of %q" } */
  28   printf ("%qs", s); /* { dg-warning "length" "bad use of %q" } */
  29   printf ("%qp", p); /* { dg-warning "length" "bad use of %q" } */
  30   printf ("%qC", lc); /* { dg-warning "length" "bad use of %q" } */
  31   printf ("%qS", ls); /* { dg-warning "length" "bad use of %q" } */
  32   /* With a bad length GCC wants some argument, any argument,
  33      to devour with the format conversion, as a synchronisation heuristic.
  34      This may get improved later.
  35   */
  36   printf ("%qm", i); /* { dg-warning "length" "bad use of %q" } */
  37   /* As an extension, GCC allows the length "Z" as a synonym for "z".
  38      This was an extension predating C99 which should now be considered
  39      deprecated; use the standard "z" instead.
  40   */
  41   printf ("%Zd%Zi%Zo%Zu%Zx%ZX", z, z, z, z, z, z);
  42   printf ("%Zn", zn);
  43   printf ("%Zf", d); /* { dg-warning "length" "bad use of %Z" } */
  44   printf ("%ZF", d); /* { dg-warning "length" "bad use of %Z" } */
  45   printf ("%Ze", d); /* { dg-warning "length" "bad use of %Z" } */
  46   printf ("%ZE", d); /* { dg-warning "length" "bad use of %Z" } */
  47   printf ("%Zg", d); /* { dg-warning "length" "bad use of %Z" } */
  48   printf ("%ZG", d); /* { dg-warning "length" "bad use of %Z" } */
  49   printf ("%Za", d); /* { dg-warning "length" "bad use of %Z" } */
  50   printf ("%ZA", d); /* { dg-warning "length" "bad use of %Z" } */
  51   printf ("%Zc", i); /* { dg-warning "length" "bad use of %Z" } */
  52   printf ("%Zs", s); /* { dg-warning "length" "bad use of %Z" } */
  53   printf ("%Zp", p); /* { dg-warning "length" "bad use of %Z" } */
  54   printf ("%ZC", lc); /* { dg-warning "length" "bad use of %Z" } */
  55   printf ("%ZS", ls); /* { dg-warning "length" "bad use of %Z" } */
  56   printf ("%Zm", i); /* { dg-warning "length" "bad use of %Z" } */
  57   /* As an extension, GCC allows the length "L" on integer formats
  58      (but not %n) as a synonym for "ll".
  59      This should be considered deprecated.
  60   */
  61   printf ("%Ld%Li%Lo%Lu%Lx%LX", ll, ll, ull, ull, ull, ull);
  62   /* As an extension, derived from syslog, GCC allows the conversion
  63      specifier "m" for formatting strerror(errno).  This may be used
  64      with width, precision and the "-" flag, the same as %s.
  65   */
  66   printf ("%m%3m%.4m%5.6m");
  67   printf ("%*m", i);
  68   printf ("%.*m", i);
  69   printf ("%*.*m", i, i);
  70   printf ("%3.*m", i);
  71   printf ("%*.4m", i);
  72   printf ("%-m");
  73   printf ("%+m"); /* { dg-warning "flag" "bad %+m" } */
  74   printf ("% m"); /* { dg-warning "flag" "bad % m" } */
  75   printf ("%#m"); /* { dg-warning "flag" "bad %#m" } */
  76   printf ("%0m"); /* { dg-warning "flag" "bad %0m" } */
  77   printf ("%'m"); /* { dg-warning "flag" "bad %'m" } */
  78   printf ("%hm", i); /* { dg-warning "length" "bad %hm" } */
  79   printf ("%hhm", i); /* { dg-warning "length" "bad %hhm" } */
  80   printf ("%lm", i); /* { dg-warning "length" "bad %lm" } */
  81   printf ("%llm", i); /* { dg-warning "length" "bad %llm" } */
  82   printf ("%jm", i); /* { dg-warning "length" "bad %jm" } */
  83   printf ("%zm", i); /* { dg-warning "length" "bad %zm" } */
  84   printf ("%tm", i); /* { dg-warning "length" "bad %tm" } */
  85   printf ("%Lm", i); /* { dg-warning "length" "bad %Lm" } */
  86   printf ("%qm", i); /* { dg-warning "length" "bad %qm" } */
  87   printf ("%Zm", i); /* { dg-warning "length" "bad %Zm" } */
  88   /* It should be OK to mix %m formats with $ operand number formats.  */
  89   printf ("%2$ld%m%1$d", i, l);
  90   /* Likewise, %m formats with width and precision should not have an
  91      operand number for the %m itself.
  92   */
  93   printf ("%*2$.*1$m", i, i);
  94   printf ("%1$*2$.*1$m", i, i); /* { dg-warning "no argument" "printf %1\$m" } */
  95   /* As an extension, glibc includes the "I" flag for decimal
  96      formats, to output using the locale's digits (e.g. in Arabic).
  97      In GCC, we require this to be in the standard place for flags, though
  98      glibc allows it also after width or precision.
  99   */
 100   printf ("%Id%Ii%Iu", i, i, u);
 101   printf ("%Io", u); /* { dg-warning "flag" "bad use of I flag" } */
 102   printf ("%Ix", u); /* { dg-warning "flag" "bad use of I flag" } */
 103   printf ("%IX", u); /* { dg-warning "flag" "bad use of I flag" } */
 104   printf ("%In", n); /* { dg-warning "flag" "bad use of I flag" } */
 105   printf ("%If", d);
 106   printf ("%IF", d);
 107   printf ("%Ie", d);
 108   printf ("%IE", d);
 109   printf ("%Ig", d);
 110   printf ("%IG", d);
 111   printf ("%Ia", d); /* { dg-warning "flag" "bad use of I flag" } */
 112   printf ("%IA", d); /* { dg-warning "flag" "bad use of I flag" } */
 113   printf ("%Ic", i); /* { dg-warning "flag" "bad use of I flag" } */
 114   printf ("%Is", s); /* { dg-warning "flag" "bad use of I flag" } */
 115   printf ("%Ip", p); /* { dg-warning "flag" "bad use of I flag" } */
 116   printf ("%IC", lc); /* { dg-warning "flag" "bad use of I flag" } */
 117   printf ("%IS", ls); /* { dg-warning "flag" "bad use of I flag" } */
 118   printf ("%Im"); /* { dg-warning "flag" "bad use of I flag" } */
 119
 120   /* As an extension, GCC does format checking on "unlocked"
 121      i.e. thread unsafe versions of these functions.  */
 122   fprintf_unlocked (stdout, "%d", i);
 123   fprintf_unlocked (stdout, "%ld", i); /* { dg-warning "format" "fprintf_unlocked" } */
 124   printf_unlocked ("%d", i);
 125   printf_unlocked ("%ld", i); /* { dg-warning "format" "printf_unlocked" } */
 126 }