2 PROJECT: FlowerSoft C++ library
3 FILE : string-convert.cc
7 #include "string-convert.hh"
13 #include "libc-extension.hh"
14 #include "rational.hh"
15 #include "std-vector.hh"
18 A safe length for stringconversion buffers.
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.
23 Should enlarge buff dynamically.
28 static const int STRING_BUFFER_LEN = 1024;
31 String_convert::bool_string (bool b)
33 return string (b ? "true" : "false");
37 String_convert::bin2hex (Byte bin_char)
40 str += ::to_string ((char) nibble2hex_byte ((Byte) (bin_char >> 4)));
41 str += ::to_string ((char) nibble2hex_byte (bin_char++));
46 String_convert::bin2hex (const string &bin_string)
49 Byte const *byte = (Byte const *)bin_string.data ();
50 for (ssize i = 0; i < bin_string.length (); i++)
52 str += ::to_string ((char)nibble2hex_byte ((Byte) (*byte >> 4)));
53 str += ::to_string ((char)nibble2hex_byte (*byte++));
59 String_convert::bin2int (const string &bin_string)
61 return bin2unsigned (bin_string);
65 String_convert::bin2unsigned (const string &bin_string)
67 assert (bin_string.length () <= (int)sizeof (unsigned));
69 unsigned result_u = 0;
70 for (ssize i = 0; i < bin_string.length (); i++)
73 result_u += (Byte)bin_string[ i ];
79 String_convert::dec2int (const string &dec_string)
81 if (!dec_string.length ())
85 if (!sscanf (dec_string.c_str (), "%ld", &l))
92 String_convert::i64_string (I64 i64, char const *fmt)
94 char buffer[STRING_BUFFER_LEN];
95 snprintf (buffer, STRING_BUFFER_LEN,
96 (fmt ? fmt : "%Ld"), i64); // assume radix 10
97 return string (buffer);
99 // breendet imp from string
101 String_convert::dec2double (const string &dec_string)
103 if (!dec_string.length ())
107 if (!sscanf (dec_string.c_str (), "%lf", &d))
114 String_convert::hex2bin (string hex_string, string &bin_string_r)
116 if (hex_string.length () % 2)
117 hex_string = "0" + hex_string;
120 Byte const *byte = (Byte const *) hex_string.data ();
122 while (i < hex_string.length ())
124 int high_i = hex2nibble (*byte++);
125 int low_i = hex2nibble (*byte++);
126 if (high_i < 0 || low_i < 0)
127 return 1; // invalid char
128 bin_string_r += ::to_string ((char) (high_i << 4 | low_i), 1);
135 String_convert::hex2bin (const string &hex_string)
139 if (hex2bin (hex_string, str))
146 String_convert::hex2nibble (Byte byte)
148 if (byte >= '0' && byte <= '9')
150 if (byte >= 'A' && byte <= 'F')
151 return byte - 'A' + 10;
152 if (byte >= 'a' && byte <= 'f')
153 return byte - 'a' + 10;
157 // stupido. Should use int_string ()
159 String_convert::int2dec (int i, size_t length_i, char ch)
166 string dec_string = ::to_string (i);
169 return ::to_string (fill_char, ssize_t (length_i - dec_string.length ())) + dec_string;
172 // stupido. Should use int_string ()
174 String_convert::unsigned2hex (unsigned u, size_t length, char fill_char)
183 str = ::to_string ((char) ((u % 16)["0123456789abcdef"])) + str;
187 str += int_string (u, "%x"); // hmm. %lx vs. %x -> portability?
190 str = ::to_string (fill_char, ssize_t (length - str.length ())) + str;
191 while ((str.length () > length) && (str[ 0 ] == 'f'))
192 str = str.substr (2);
198 String_convert::int2hex (int i, size_t length_i, char fill_char)
200 return unsigned2hex ((unsigned)i, length_i, fill_char);
204 String_convert::nibble2hex_byte (Byte byte)
206 if ((byte & 0x0f) <= 9)
207 return (Byte) ((byte & 0x0f) + '0');
209 return (Byte) ((byte & 0x0f) - 10 + 'a');
212 Convert an integer to a string
215 #fmt# is a printf style format, default assumes "%d" as format.
218 String_convert::int_string (int i, char const *fmt)
220 char buffer[STRING_BUFFER_LEN];
221 snprintf (buffer, STRING_BUFFER_LEN,
222 (fmt ? fmt : "%d"), i); // assume radix 10
223 return string (buffer);
227 String_convert::form_string (char const *format, ...)
230 va_start (args, format);
231 char buffer[STRING_BUFFER_LEN];
232 vsnprintf (buffer, STRING_BUFFER_LEN, format, args);
234 return string (buffer);
238 String_convert::vform_string (char const *format, va_list args)
240 char buffer[STRING_BUFFER_LEN];
241 vsnprintf (buffer, STRING_BUFFER_LEN, format, args);
242 return string (buffer);
246 Convert a double to a string.
248 @param #fmt# is a printf style format, default assumes "%lf" as format
251 String_convert::double_string (double f, char const *fmt)
253 char buf[STRING_BUFFER_LEN];
255 snprintf (buf, STRING_BUFFER_LEN, fmt ? fmt : "%f", f);
260 Make a string from a single character.
263 #n# is a repetition count, default value is 1
266 String_convert::char_string (char c, int n)
269 char *ch = new char[ n ];
278 String_convert::rational_string (Rational r)
280 return r.to_string ();
284 String_convert::pointer_string (void const *l)
286 char buffer[STRING_BUFFER_LEN];
287 snprintf (buffer, STRING_BUFFER_LEN, "%p", l); // assume radix 10
288 return string (buffer);
292 Convert a double to a string.
295 #n# is the number of nonzero digits
298 String_convert::precision_string (double x, int n)
300 string format = "%." + ::to_string (max (0, n - 1)) + "e";
301 string str = double_string (abs (x), format.c_str ());
303 int exp = dec2int (str.substr (str.length () - 3));
304 str = str.substr (0, str.length () - 4);
306 while (str[str.length () - 1] == '0')
307 str = str.substr (0, str.length () - 1);
308 if (str[str.length () - 1] == '.')
309 str = str.substr (0, str.length () - 1);
312 return (sign (x) > 0 ? str : "-" + str);
314 str = str.substr (0, 1) + str.substr (2);
317 str = "0." + ::to_string ('0', -dot) + str;
318 else if (dot >= str.length ())
319 str += ::to_string ('0', dot - str.length ());
320 else if ((dot > 0) && (dot < str.length ()))
321 str = str.substr (0, dot) + "." + str.substr (dot);
325 return (sign (x) > 0 ? str : "-" + str);
329 String_convert::long_string (long l)
331 char s[STRING_BUFFER_LEN];
332 sprintf (s, "%ld", l);
337 String_convert::unsigned_string (unsigned u)
339 char s[STRING_BUFFER_LEN];
340 sprintf (s, "%u", u);
345 String_convert::unsigned_long_string (unsigned long ul)
347 char s[STRING_BUFFER_LEN];
348 sprintf (s, "%lu", ul);
353 String_convert::pad_to (const string &s, size_t n)
355 return s + string (max (int (n - s.length ()), 0), ' ');
359 String_convert::to_upper (string s)
361 return strnupr (const_cast<char*>(s.c_str ()), s.length ());
365 String_convert::to_lower (string s)
367 return strnlwr (const_cast<char*>(s.c_str ()), s.length ());
371 String_convert::reverse (string s)
373 return (char *) memrev ((unsigned char *)s.data (), s.length ());