src/basic/stdio-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include <printf.h>
   5 #include <stdarg.h>
   6 #include <stdio.h>
   7 #include <sys/types.h>
   8
   9 #include "macro.h"
  10 #include "memory-util.h"
  11
  12 #define snprintf_ok(buf, len, fmt, ...) \
  13         ((size_t) snprintf(buf, len, fmt, __VA_ARGS__) < (len))
  14
  15 #define xsprintf(buf, fmt, ...) \
  16         assert_message_se(snprintf_ok(buf, ELEMENTSOF(buf), fmt, __VA_ARGS__), "xsprintf: " #buf "[] must be big enough")
  17
  18 #define VA_FORMAT_ADVANCE(format, ap)                                   \
  19 do {                                                                    \
  20         int _argtypes[128];                                             \
  21         size_t _i, _k;                                                  \
  22         /* See https://github.com/google/sanitizers/issues/992 */       \
  23         if (HAS_FEATURE_MEMORY_SANITIZER)                               \
  24                 zero(_argtypes);                                        \
  25         _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
  26         assert(_k < ELEMENTSOF(_argtypes));                             \
  27         for (_i = 0; _i < _k; _i++) {                                   \
  28                 if (_argtypes[_i] & PA_FLAG_PTR)  {                     \
  29                         (void) va_arg(ap, void*);                       \
  30                         continue;                                       \
  31                 }                                                       \
  32                                                                         \
  33                 switch (_argtypes[_i]) {                                \
  34                 case PA_INT:                                            \
  35                 case PA_INT|PA_FLAG_SHORT:                              \
  36                 case PA_CHAR:                                           \
  37                         (void) va_arg(ap, int);                         \
  38                         break;                                          \
  39                 case PA_INT|PA_FLAG_LONG:                               \
  40                         (void) va_arg(ap, long int);                    \
  41                         break;                                          \
  42                 case PA_INT|PA_FLAG_LONG_LONG:                          \
  43                         (void) va_arg(ap, long long int);               \
  44                         break;                                          \
  45                 case PA_WCHAR:                                          \
  46                         (void) va_arg(ap, wchar_t);                     \
  47                         break;                                          \
  48                 case PA_WSTRING:                                        \
  49                 case PA_STRING:                                         \
  50                 case PA_POINTER:                                        \
  51                         (void) va_arg(ap, void*);                       \
  52                         break;                                          \
  53                 case PA_FLOAT:                                          \
  54                 case PA_DOUBLE:                                         \
  55                         (void) va_arg(ap, double);                      \
  56                         break;                                          \
  57                 case PA_DOUBLE|PA_FLAG_LONG_DOUBLE:                     \
  58                         (void) va_arg(ap, long double);                 \
  59                         break;                                          \
  60                 default:                                                \
  61                         assert_not_reached("Unknown format string argument."); \
  62                 }                                                       \
  63         }                                                               \
  64 } while (false)