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
  11 #define snprintf_ok(buf, len, fmt, ...) \
  12         ((size_t) snprintf(buf, len, fmt, __VA_ARGS__) < (len))
  13
  14 #define xsprintf(buf, fmt, ...) \
  15         assert_message_se(snprintf_ok(buf, ELEMENTSOF(buf), fmt, __VA_ARGS__), "xsprintf: " #buf "[] must be big enough")
  16
  17 #define VA_FORMAT_ADVANCE(format, ap)                                   \
  18 do {                                                                    \
  19         int _argtypes[128];                                             \
  20         size_t _i, _k;                                                  \
  21         _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
  22         assert(_k < ELEMENTSOF(_argtypes));                             \
  23         for (_i = 0; _i < _k; _i++) {                                   \
  24                 if (_argtypes[_i] & PA_FLAG_PTR)  {                     \
  25                         (void) va_arg(ap, void*);                       \
  26                         continue;                                       \
  27                 }                                                       \
  28                                                                         \
  29                 switch (_argtypes[_i]) {                                \
  30                 case PA_INT:                                            \
  31                 case PA_INT|PA_FLAG_SHORT:                              \
  32                 case PA_CHAR:                                           \
  33                         (void) va_arg(ap, int);                         \
  34                         break;                                          \
  35                 case PA_INT|PA_FLAG_LONG:                               \
  36                         (void) va_arg(ap, long int);                    \
  37                         break;                                          \
  38                 case PA_INT|PA_FLAG_LONG_LONG:                          \
  39                         (void) va_arg(ap, long long int);               \
  40                         break;                                          \
  41                 case PA_WCHAR:                                          \
  42                         (void) va_arg(ap, wchar_t);                     \
  43                         break;                                          \
  44                 case PA_WSTRING:                                        \
  45                 case PA_STRING:                                         \
  46                 case PA_POINTER:                                        \
  47                         (void) va_arg(ap, void*);                       \
  48                         break;                                          \
  49                 case PA_FLOAT:                                          \
  50                 case PA_DOUBLE:                                         \
  51                         (void) va_arg(ap, double);                      \
  52                         break;                                          \
  53                 case PA_DOUBLE|PA_FLAG_LONG_DOUBLE:                     \
  54                         (void) va_arg(ap, long double);                 \
  55                         break;                                          \
  56                 default:                                                \
  57                         assert_not_reached("Unknown format string argument."); \
  58                 }                                                       \
  59         }                                                               \
  60 } while (false)