src/basic/stdio-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   This file is part of systemd.
   6
   7   Copyright 2010 Lennart Poettering
   8 ***/
   9
  10 #if 0 /// elogind is musl-libc compatible and does not directly include printf.h
  11 #include <printf.h>
  12 #else
  13 #include "parse-printf-format.h"
  14 #endif // 0
  15 #include <stdarg.h>
  16 #include <stdio.h>
  17 #include <sys/types.h>
  18
  19 #include "macro.h"
  20
  21 #define snprintf_ok(buf, len, fmt, ...) \
  22         ((size_t) snprintf(buf, len, fmt, __VA_ARGS__) < (len))
  23
  24 #define xsprintf(buf, fmt, ...) \
  25         assert_message_se(snprintf_ok(buf, ELEMENTSOF(buf), fmt, __VA_ARGS__), "xsprintf: " #buf "[] must be big enough")
  26
  27 #define VA_FORMAT_ADVANCE(format, ap)                                   \
  28 do {                                                                    \
  29         int _argtypes[128];                                             \
  30         size_t _i, _k;                                                  \
  31         _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
  32         assert(_k < ELEMENTSOF(_argtypes));                             \
  33         for (_i = 0; _i < _k; _i++) {                                   \
  34                 if (_argtypes[_i] & PA_FLAG_PTR)  {                     \
  35                         (void) va_arg(ap, void*);                       \
  36                         continue;                                       \
  37                 }                                                       \
  38                                                                         \
  39                 switch (_argtypes[_i]) {                                \
  40                 case PA_INT:                                            \
  41                 case PA_INT|PA_FLAG_SHORT:                              \
  42                 case PA_CHAR:                                           \
  43                         (void) va_arg(ap, int);                         \
  44                         break;                                          \
  45                 case PA_INT|PA_FLAG_LONG:                               \
  46                         (void) va_arg(ap, long int);                    \
  47                         break;                                          \
  48                 case PA_INT|PA_FLAG_LONG_LONG:                          \
  49                         (void) va_arg(ap, long long int);               \
  50                         break;                                          \
  51                 case PA_WCHAR:                                          \
  52                         (void) va_arg(ap, wchar_t);                     \
  53                         break;                                          \
  54                 case PA_WSTRING:                                        \
  55                 case PA_STRING:                                         \
  56                 case PA_POINTER:                                        \
  57                         (void) va_arg(ap, void*);                       \
  58                         break;                                          \
  59                 case PA_FLOAT:                                          \
  60                 case PA_DOUBLE:                                         \
  61                         (void) va_arg(ap, double);                      \
  62                         break;                                          \
  63                 case PA_DOUBLE|PA_FLAG_LONG_DOUBLE:                     \
  64                         (void) va_arg(ap, long double);                 \
  65                         break;                                          \
  66                 default:                                                \
  67                         assert_not_reached("Unknown format string argument."); \
  68                 }                                                       \
  69         }                                                               \
  70 } while (false)