utility.h

   1 /*
   2  * utility.h
   3  *
   4  * Home page of code is: http://smartmontools.sourceforge.net
   5  *
   6  * Copyright (C) 2002-11 Bruce Allen <smartmontools-support@lists.sourceforge.net>
   7  * Copyright (C) 2008-11 Christian Franke <smartmontools-support@lists.sourceforge.net>
   8  * Copyright (C) 2000 Michael Cornwell <cornwell@acm.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2, or (at your option)
  13  * any later version.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * (for example COPYING); if not, write to the Free
  17  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  * This code was originally developed as a Senior Thesis by Michael Cornwell
  20  * at the Concurrent Systems Laboratory (now part of the Storage Systems
  21  * Research Center), Jack Baskin School of Engineering, University of
  22  * California, Santa Cruz. http://ssrc.soe.ucsc.edu/
  23  *
  24  */
  25
  26 #ifndef UTILITY_H_
  27 #define UTILITY_H_
  28
  29 #define UTILITY_H_CVSID "$Id: utility.h 3305 2011-03-30 21:32:05Z chrfranke $"
  30
  31 #include <time.h>
  32 #include <sys/types.h> // for regex.h (according to POSIX)
  33 #include <regex.h>
  34 #include <stdarg.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <string>
  38
  39 #if !defined(__GNUC__) && !defined(__attribute__)
  40 #define __attribute__(x)  /**/
  41 #endif
  42
  43 // Make version information string
  44 std::string format_version_info(const char * prog_name, bool full = false);
  45
  46 // return (v)sprintf() formated std::string
  47 std::string strprintf(const char * fmt, ...)
  48     __attribute__ ((format (printf, 1, 2)));
  49 std::string vstrprintf(const char * fmt, va_list ap);
  50
  51 #ifndef HAVE_WORKING_SNPRINTF
  52 // Substitute by safe replacement functions
  53 int safe_snprintf(char *buf, int size, const char *fmt, ...)
  54     __attribute__ ((format (printf, 3, 4)));
  55 int safe_vsnprintf(char *buf, int size, const char *fmt, va_list ap);
  56 #define snprintf  safe_snprintf
  57 #define vsnprintf safe_vsnprintf
  58 #endif
  59
  60 #ifndef HAVE_STRTOULL
  61 // Replacement for missing strtoull() (Linux with libc < 6, MSVC)
  62 uint64_t strtoull(const char * p, char * * endp, int base);
  63 #endif
  64
  65 // Utility function prints current date and time and timezone into a
  66 // character buffer of length>=64.  All the fuss is needed to get the
  67 // right timezone info (sigh).
  68 #define DATEANDEPOCHLEN 64
  69 void dateandtimezone(char *buffer);
  70 // Same, but for time defined by epoch tval
  71 void dateandtimezoneepoch(char *buffer, time_t tval);
  72
  73 // like printf() except that we can control it better. Note --
  74 // although the prototype is given here in utility.h, the function
  75 // itself is defined differently in smartctl and smartd.  So the
  76 // function definition(s) are in smartd.c and in smartctl.c.
  77 void pout(const char *fmt, ...)
  78      __attribute__ ((format (printf, 1, 2)));
  79
  80 // replacement for perror() with redirected output.
  81 void syserror(const char *message);
  82
  83 // Function for processing -r option in smartctl and smartd
  84 int split_report_arg(char *s, int *i);
  85 // Function for processing -c option in smartctl and smartd
  86 int split_report_arg2(char *s, int *i);
  87
  88 // Function for processing -t selective... option in smartctl
  89 int split_selective_arg(char *s, uint64_t *start, uint64_t *stop, int *mode);
  90
  91
  92 // Guess device type (ata or scsi) based on device name
  93 // Guessing will now use Controller Type defines below
  94
  95 // Moved to C++ interface
  96 //int guess_device_type(const char * dev_name);
  97
  98 // Create and return the list of devices to probe automatically
  99 // if the DEVICESCAN option is in the smartd config file
 100 // Moved to C++ interface
 101 //int make_device_names (char ***devlist, const char* name);
 102
 103 // Replacement for exit(status)
 104 // (exit is not compatible with C++ destructors)
 105 #define EXIT(status) { throw (int)(status); }
 106
 107
 108 #ifdef OLD_INTERFACE
 109
 110 // replacement for calloc() that tracks memory usage
 111 void *Calloc(size_t nmemb, size_t size);
 112
 113 // Utility function to free memory
 114 void *FreeNonZero1(void* address, int size, int whatline, const char* file);
 115
 116 // Typesafe version of above
 117 template <class T>
 118 inline T * FreeNonZero(T * address, int size, int whatline, const char* file)
 119   { return (T *)FreeNonZero1((void *)address, size, whatline, file); }
 120
 121 // A custom version of strdup() that keeps track of how much memory is
 122 // being allocated. If mustexist is set, it also throws an error if we
 123 // try to duplicate a NULL string.
 124 char *CustomStrDup(const char *ptr, int mustexist, int whatline, const char* file);
 125
 126 // To help with memory checking.  Use when it is known that address is
 127 // NOT null.
 128 void *CheckFree1(void *address, int whatline, const char* file);
 129
 130 // Typesafe version of above
 131 template <class T>
 132 inline T * CheckFree(T * address, int whatline, const char* file)
 133   { return (T *)CheckFree1((void *)address, whatline, file); }
 134
 135 #endif // OLD_INTERFACE
 136
 137 // Compile time check of byte ordering
 138 // (inline const function allows compiler to remove dead code)
 139 inline bool isbigendian()
 140 {
 141 #ifdef WORDS_BIGENDIAN
 142   return true;
 143 #else
 144   return false;
 145 #endif
 146 }
 147
 148 // Runtime check of byte ordering, throws if different from isbigendian().
 149 void check_endianness();
 150
 151 // This value follows the peripheral device type value as defined in
 152 // SCSI Primary Commands, ANSI INCITS 301:1997.  It is also used in
 153 // the ATA standard for packet devices to define the device type.
 154 const char *packetdevicetype(int type);
 155
 156 // Moved to C++ interface
 157 //int deviceopen(const char *pathname, char *type);
 158
 159 //int deviceclose(int fd);
 160
 161 // Optional functions of os_*.c
 162 #ifdef HAVE_GET_OS_VERSION_STR
 163 // Return build host and OS version as static string
 164 //const char * get_os_version_str(void);
 165 #endif
 166
 167 // returns true if any of the n bytes are nonzero, else zero.
 168 bool nonempty(const void * data, int size);
 169
 170 // needed to fix glibc bug
 171 void FixGlibcTimeZoneBug();
 172
 173 // convert time in msec to a text string
 174 void MsecToText(unsigned int msec, char *txt);
 175
 176 // Format integer with thousands separator
 177 const char * format_with_thousands_sep(char * str, int strsize, uint64_t val,
 178                                        const char * thousands_sep = 0);
 179
 180 // Format capacity with SI prefixes
 181 const char * format_capacity(char * str, int strsize, uint64_t val,
 182                              const char * decimal_point = 0);
 183
 184 // Wrapper class for a raw data buffer
 185 class raw_buffer
 186 {
 187 public:
 188   explicit raw_buffer(unsigned sz, unsigned char val = 0)
 189     : m_data(new unsigned char[sz]),
 190       m_size(sz)
 191     { memset(m_data, val, m_size); }
 192
 193   ~raw_buffer()
 194     { delete [] m_data; }
 195
 196   unsigned size() const
 197     { return m_size; }
 198
 199   unsigned char * data()
 200     { return m_data; }
 201   const unsigned char * data() const
 202     { return m_data; }
 203
 204 private:
 205   unsigned char * m_data;
 206   unsigned m_size;
 207
 208   raw_buffer(const raw_buffer &);
 209   void operator=(const raw_buffer &);
 210 };
 211
 212 /// Wrapper class for FILE *.
 213 class stdio_file
 214 {
 215 public:
 216   explicit stdio_file(FILE * f = 0, bool owner = false)
 217     : m_file(f), m_owner(owner) { }
 218
 219   stdio_file(const char * name, const char * mode)
 220     : m_file(fopen(name, mode)), m_owner(true) { }
 221
 222   ~stdio_file()
 223     {
 224       if (m_file && m_owner)
 225         fclose(m_file);
 226     }
 227
 228   bool open(const char * name, const char * mode)
 229     {
 230       m_file = fopen(name, mode);
 231       m_owner = true;
 232       return !!m_file;
 233     }
 234
 235   void open(FILE * f, bool owner = false)
 236     {
 237       m_file = f;
 238       m_owner = owner;
 239     }
 240
 241   bool close()
 242     {
 243       if (!m_file)
 244         return true;
 245       bool ok = !ferror(m_file);
 246       if (fclose(m_file))
 247         ok = false;
 248       m_file = 0;
 249       return ok;
 250     }
 251
 252   operator FILE * ()
 253     { return m_file; }
 254
 255   bool operator!() const
 256     { return !m_file; }
 257
 258 private:
 259   FILE * m_file;
 260   bool m_owner;
 261
 262   stdio_file(const stdio_file &);
 263   void operator=(const stdio_file &);
 264 };
 265
 266 /// Wrapper class for regex(3).
 267 /// Supports copy & assignment and is compatible with STL containers.
 268 class regular_expression
 269 {
 270 public:
 271   // Construction & assignment
 272   regular_expression();
 273
 274   regular_expression(const char * pattern, int flags,
 275                      bool throw_on_error = true);
 276
 277   ~regular_expression();
 278
 279   regular_expression(const regular_expression & x);
 280
 281   regular_expression & operator=(const regular_expression & x);
 282
 283   /// Set and compile new pattern, return false on error.
 284   bool compile(const char * pattern, int flags);
 285
 286   // Get pattern from last compile().
 287   const char * get_pattern() const
 288     { return m_pattern.c_str(); }
 289
 290   /// Get error message from last compile().
 291   const char * get_errmsg() const
 292     { return m_errmsg.c_str(); }
 293
 294   // Return true if pattern is not set or bad.
 295   bool empty() const
 296     { return (m_pattern.empty() || !m_errmsg.empty()); }
 297
 298   /// Return true if substring matches pattern
 299   bool match(const char * str, int flags = 0) const
 300     { return !regexec(&m_regex_buf, str, 0, (regmatch_t*)0, flags); }
 301
 302   /// Return true if full string matches pattern
 303   bool full_match(const char * str, int flags = 0) const
 304     {
 305       regmatch_t range;
 306       return (   !regexec(&m_regex_buf, str, 1, &range, flags)
 307               && range.rm_so == 0 && range.rm_eo == (int)strlen(str));
 308     }
 309
 310   /// Return true if substring matches pattern, fill regmatch_t array.
 311   bool execute(const char * str, unsigned nmatch, regmatch_t * pmatch, int flags = 0) const
 312     { return !regexec(&m_regex_buf, str, nmatch, pmatch, flags); }
 313
 314 private:
 315   std::string m_pattern;
 316   int m_flags;
 317   regex_t m_regex_buf;
 318   std::string m_errmsg;
 319
 320   void free_buf();
 321   void copy(const regular_expression & x);
 322   bool compile();
 323 };
 324
 325 #ifdef _WIN32
 326 // Get exe directory
 327 //(implemented in os_win32.cpp)
 328 std::string get_exe_dir();
 329 #endif
 330
 331
 332 #ifdef OLD_INTERFACE
 333 // remaining controller types in old interface modules
 334 #define CONTROLLER_UNKNOWN              0x00
 335 #define CONTROLLER_ATA                  0x01
 336 #define CONTROLLER_SCSI                 0x02
 337 #endif
 338
 339 #endif
 340