flower/string-convert.cc

   1 /*
   2   PROJECT: FlowerSoft C++ library
   3   FILE   : string-convert.cc
   4
   5   --*/
   6
   7 #include "string-convert.hh"
   8
   9 #include <cstring>
  10 #include <cstdio>
  11 using namespace std;
  12
  13 #include "libc-extension.hh"
  14 #include "rational.hh"
  15 #include "std-vector.hh"
  16
  17 /**
  18    A safe length for stringconversion buffers.
  19
  20    worst case would be %f printing HUGE (or 1/HUGE), which is approx
  21    2e318, this number would have approx 318 zero's in its string.
  22
  23    Should enlarge buff dynamically.
  24
  25    @see
  26    man 3 snprintf
  27 */
  28 static const int STRING_BUFFER_LEN = 1024;
  29
  30 std::string
  31 String_convert::bool_string (bool b)
  32 {
  33   return std::string (b ? "true" : "false");
  34 }
  35
  36 std::string
  37 String_convert::bin2hex (std::string bin_string)
  38 {
  39   std::string str;
  40   Byte const *byte = (Byte const*)bin_string.data ();
  41   for (ssize i = 0; i < bin_string.length (); i++)
  42     {
  43       str += to_string ((char)nibble2hex_byte (*byte >> 4));
  44       str += to_string ((char)nibble2hex_byte (*byte++));
  45     }
  46   return str;
  47 }
  48
  49 int
  50 String_convert::bin2int (std::string bin_string)
  51 {
  52   return bin2unsigned (bin_string);
  53 }
  54
  55 unsigned
  56 String_convert::bin2unsigned (std::string bin_string)
  57 {
  58   assert (bin_string.length () <= (int)sizeof (unsigned));
  59
  60   unsigned result_u = 0;
  61   for (ssize i = 0; i < bin_string.length (); i++)
  62     {
  63       result_u <<= 8;
  64       result_u += (Byte)bin_string[ i ];
  65     }
  66   return result_u;
  67 }
  68
  69 // breendet imp from std::string
  70 int
  71 String_convert::dec2int (std::string dec_string)
  72 {
  73   if (!dec_string.length ())
  74     return 0;
  75
  76   long l = 0;
  77   int conv = sscanf (dec_string.c_str (), "%ld", &l);
  78   assert (conv);
  79
  80   return (int)l;
  81 }
  82
  83 std::string
  84 String_convert::i64_string (I64 i64, char const *fmt)
  85 {
  86   char buffer[STRING_BUFFER_LEN];
  87   snprintf (buffer, STRING_BUFFER_LEN,
  88             (fmt ? fmt : "%Ld"), i64); // assume radix 10
  89   return std::string (buffer);
  90 }
  91 // breendet imp from std::string
  92 double
  93 String_convert::dec2double (std::string dec_string)
  94 {
  95   if (!dec_string.length ())
  96     return 0;
  97   double d = 0;
  98   int conv = sscanf (dec_string.c_str (), "%lf", &d);
  99   assert (conv);
 100   return d;
 101 }
 102
 103 int
 104 String_convert::hex2bin (std::string hex_string, std::string &bin_string_r)
 105 {
 106   if (hex_string.length () % 2)
 107     hex_string = "0" + hex_string;
 108
 109   bin_string_r = "";
 110   Byte const *byte = (Byte const*) hex_string.data ();
 111   ssize i = 0;
 112   while (i < hex_string.length ())
 113     {
 114       int high_i = hex2nibble (*byte++);
 115       int low_i = hex2nibble (*byte++);
 116       if (high_i < 0 || low_i < 0)
 117         return 1; // illegal char
 118       bin_string_r += to_string ((char) (high_i << 4 | low_i), 1);
 119       i += 2;
 120     }
 121   return 0;
 122 }
 123
 124 std::string
 125 String_convert::hex2bin (std::string hex_string)
 126 {
 127   std::string str;
 128   //  silly, asserts should alway be "on"!
 129   //    assert (!hex2bin (hex_string, str) );
 130   int error_i = hex2bin (hex_string, str);
 131   assert (!error_i);
 132   return str;
 133 }
 134
 135 int
 136 String_convert::hex2nibble (Byte byte)
 137 {
 138   if (byte >= '0' && byte <= '9')
 139     return byte - '0';
 140   if (byte >= 'A' && byte <= 'F')
 141     return byte - 'A' + 10;
 142   if (byte >= 'a' && byte <= 'f')
 143     return byte - 'a' + 10;
 144   return -1;
 145 }
 146
 147 // stupido.  Should use int_string ()
 148 std::string
 149 String_convert::int2dec (int i, int length_i, char ch)
 150 {
 151   char fill_char = ch;
 152   if (fill_char)
 153     fill_char = '0';
 154
 155   // ugh
 156   std::string dec_string = to_string (i);
 157
 158   // ugh
 159   return to_string (fill_char, length_i - dec_string.length ()) + dec_string;
 160 }
 161
 162 // stupido.  Should use int_string ()
 163 std::string
 164 String_convert::unsigned2hex (unsigned u, ssize length, char fill_char)
 165 {
 166   std::string str;
 167   if (!u)
 168     str = "0";
 169
 170 #if 1 // both go...
 171   while (u)
 172     {
 173       str = to_string ((char) ((u % 16)["0123456789abcdef"])) + str;
 174       u /= 16;
 175     }
 176 #else
 177   str += int_string (u, "%x");  // hmm. %lx vs. %x -> portability?
 178 #endif
 179
 180   str = to_string (fill_char, length - str.length ()) + str;
 181   while ((str.length () > length) && (str[ 0 ] == 'f'))
 182     str = str.substr (2);
 183
 184   return str;
 185 }
 186
 187 std::string
 188 String_convert::int2hex (int i, int length_i, char fill_char)
 189 {
 190   return unsigned2hex ((unsigned)i, length_i, fill_char);
 191 }
 192
 193 Byte
 194 String_convert::nibble2hex_byte (Byte byte)
 195 {
 196   if ((byte & 0x0f) <= 9)
 197     return (byte & 0x0f) + '0';
 198   else
 199     return (byte & 0x0f) - 10 + 'a';
 200 }
 201 /**
 202    Convert an integer to a string
 203
 204    @param
 205    #fmt# is a printf style format, default assumes "%d" as format.
 206 */
 207 std::string
 208 String_convert::int_string (int i, char const *fmt)
 209 {
 210   char buffer[STRING_BUFFER_LEN];
 211   snprintf (buffer, STRING_BUFFER_LEN,
 212             (fmt ? fmt : "%d"), i); // assume radix 10
 213   return std::string (buffer);
 214 }
 215
 216 std::string
 217 String_convert::form_string (char const *format, ...)
 218 {
 219   va_list args;
 220   va_start (args, format);
 221   char buffer[STRING_BUFFER_LEN];
 222   vsnprintf (buffer, STRING_BUFFER_LEN, format, args);
 223   va_end (args);
 224   return std::string (buffer);
 225 }
 226
 227 std::string
 228 String_convert::vform_string (char const *format, va_list args)
 229 {
 230   char buffer[STRING_BUFFER_LEN];
 231   vsnprintf (buffer, STRING_BUFFER_LEN, format, args);
 232   return std::string (buffer);
 233 }
 234
 235 /**
 236    Convert a double to a string.
 237
 238    @param #fmt# is a printf style format, default assumes "%lf" as format
 239 */
 240 std::string
 241 String_convert::double_string (double f, char const *fmt)
 242 {
 243   char buf[STRING_BUFFER_LEN];
 244
 245   snprintf (buf, STRING_BUFFER_LEN, fmt ? fmt : "%f", f);
 246   return std::string (buf);
 247 }
 248
 249 /**
 250    Make a string from a single character.
 251
 252    @param
 253    #n# is a repetition count, default value is 1
 254 */
 255 std::string
 256 String_convert::char_string (char c, int n)
 257 {
 258   n = n >= 0 ? n : 0;
 259   char *ch = new char[ n ];
 260   memset (ch, c, n);
 261 #if STD_STRING
 262   std::string s (ch, n);
 263 #else
 264   std::string s (ch, n);
 265 #endif
 266   delete[] ch;
 267   return s;
 268 }
 269
 270 std::string
 271 String_convert::rational_string (Rational r)
 272 {
 273   return r.to_string ();
 274 }
 275
 276 std::string
 277 String_convert::pointer_string (void const *l)
 278 {
 279   char buffer[STRING_BUFFER_LEN];
 280   snprintf (buffer, STRING_BUFFER_LEN, "%p", l); // assume radix 10
 281   return std::string (buffer);
 282 }
 283
 284 /**
 285    Convert a double to a string.
 286
 287    @param
 288    #n# is the number of nonzero digits
 289 */
 290 std::string
 291 String_convert::precision_string (double x, int n)
 292 {
 293   std::string format = "%." + to_string (max (0, n - 1)) + "e";
 294   std::string str = double_string (abs (x), format.c_str ());
 295
 296   int exp = dec2int (str.substr (str.length () - 3));
 297   str = str.substr (0, str.length () - 4);
 298
 299   while (str[str.length () - 1] == '0')
 300     str = str.substr (0, str.length () - 1);
 301   if (str[str.length () - 1] == '.')
 302     str = str.substr (0, str.length () - 1);
 303
 304   if (exp == 0)
 305     return (sign (x) > 0 ? str : "-" + str);
 306
 307   str = str.substr (0, 1) + str.substr (2);
 308   ssize dot = 1 + exp;
 309   if (dot <= 0)
 310     str = "0." + to_string ('0', -dot) + str;
 311   else if (dot >= str.length ())
 312     str += to_string ('0', dot - str.length ());
 313   else if ((dot > 0) && (dot < str.length ()))
 314     str = str.substr (0, dot) + "." + str.substr (dot);
 315   else
 316     assert (0);
 317
 318   return (sign (x) > 0 ? str : "-" + str);
 319 }
 320
 321 std::vector<std::string>
 322 String_convert::split (std::string str, char c)
 323 {
 324   std::vector<std::string> a;
 325   ssize i = str.find (c);
 326   while (i != NPOS)
 327     {
 328       std::string s = str.substr (0, i);
 329       a.push_back (s);
 330       while (str[++i] == c)
 331         ;
 332       str = str.substr (i);
 333       i = str.find (c);
 334     }
 335   if (str.length ())
 336     a.push_back (str);
 337   return a;
 338 }
 339
 340 std::string
 341 String_convert::long_string (long l)
 342 {
 343   char s[STRING_BUFFER_LEN];
 344   sprintf (s, "%ld", l);
 345   return s;
 346 }
 347
 348 std::string
 349 String_convert::unsigned_string (unsigned u)
 350 {
 351   char s[STRING_BUFFER_LEN];
 352   sprintf (s, "%u", u);
 353   return s;
 354 }
 355
 356 std::string
 357 String_convert::pad_to (std::string s, int n)
 358 {
 359   return s + std::string (max (int(n - s.length ()), 0), ' ');
 360 }
 361
 362 std::string
 363 String_convert::to_upper (std::string s)
 364 {
 365   return strnupr ((char *)s.c_str (), s.length ());
 366 }
 367
 368 std::string
 369 String_convert::to_lower (std::string s)
 370 {
 371   return strnlwr ((char *)s.c_str (), s.length ());
 372 }
 373
 374 std::string
 375 String_convert::reverse (std::string s)
 376 {
 377   return (char*) memrev ((unsigned char *)s.data (), s.length ());
 378 }