2 PROJECT: FlowerSoft C++ library
3 FILE : string-convert.cc
7 #include "string-convert.hh"
14 #include "libc-extension.hh"
15 #include "rational.hh"
19 A safe length for stringconversion buffers.
21 worst case would be %f printing HUGE (or 1/HUGE), which is approx
22 2e318, this number would have approx 318 zero's in its string.
24 Should enlarge buff dynamically.
29 static const int STRING_BUFFER_LEN = 1024;
32 String_convert::bool_string (bool b)
34 return std::string (b ? "true" : "false");
38 String_convert::bin2hex (std::string bin_string)
41 Byte const *byte = (Byte const*)bin_string.data ();
42 for (ssize i = 0; i < bin_string.length (); i++)
44 str += to_string ((char)nibble2hex_byte (*byte >> 4));
45 str += to_string ((char)nibble2hex_byte (*byte++));
51 String_convert::bin2int (std::string bin_string)
53 return bin2unsigned (bin_string);
57 String_convert::bin2unsigned (std::string bin_string)
59 assert (bin_string.length () <= (int)sizeof (unsigned));
61 unsigned result_u = 0;
62 for (ssize i = 0; i < bin_string.length (); i++)
65 result_u += (Byte)bin_string[ i ];
70 // breendet imp from std::string
72 String_convert::dec2int (std::string dec_string)
74 if (!dec_string.length ())
78 int conv = sscanf (dec_string.c_str (), "%ld", &l);
85 String_convert::i64_string (I64 i64, char const *fmt)
87 char buffer[STRING_BUFFER_LEN];
88 snprintf (buffer, STRING_BUFFER_LEN,
89 (fmt ? fmt : "%Ld"), i64); // assume radix 10
90 return std::string (buffer);
92 // breendet imp from std::string
94 String_convert::dec2double (std::string dec_string)
96 if (!dec_string.length ())
99 int conv = sscanf (dec_string.c_str (), "%lf", &d);
105 String_convert::hex2bin (std::string hex_string, std::string &bin_string_r)
107 if (hex_string.length () % 2)
108 hex_string = "0" + hex_string;
111 Byte const *byte = (Byte const*) hex_string.data ();
113 while (i < hex_string.length ())
115 int high_i = hex2nibble (*byte++);
116 int low_i = hex2nibble (*byte++);
117 if (high_i < 0 || low_i < 0)
118 return 1; // illegal char
119 bin_string_r += to_string ((char) (high_i << 4 | low_i), 1);
126 String_convert::hex2bin (std::string hex_string)
129 // silly, asserts should alway be "on"!
130 // assert (!hex2bin (hex_string, str) );
131 int error_i = hex2bin (hex_string, str);
137 String_convert::hex2nibble (Byte byte)
139 if (byte >= '0' && byte <= '9')
141 if (byte >= 'A' && byte <= 'F')
142 return byte - 'A' + 10;
143 if (byte >= 'a' && byte <= 'f')
144 return byte - 'a' + 10;
148 // stupido. Should use int_string ()
150 String_convert::int2dec (int i, int length_i, char ch)
157 std::string dec_string = to_string (i);
160 return to_string (fill_char, length_i - dec_string.length ()) + dec_string;
163 // stupido. Should use int_string ()
165 String_convert::unsigned2hex (unsigned u, ssize length, char fill_char)
174 str = to_string ((char) ((u % 16)["0123456789abcdef"])) + str;
178 str += int_string (u, "%x"); // hmm. %lx vs. %x -> portability?
181 str = to_string (fill_char, length - str.length ()) + str;
182 while ((str.length () > length) && (str[ 0 ] == 'f'))
183 str = str.substr (2);
189 String_convert::int2hex (int i, int length_i, char fill_char)
191 return unsigned2hex ((unsigned)i, length_i, fill_char);
195 String_convert::nibble2hex_byte (Byte byte)
197 if ((byte & 0x0f) <= 9)
198 return (byte & 0x0f) + '0';
200 return (byte & 0x0f) - 10 + 'a';
203 Convert an integer to a string
206 #fmt# is a printf style format, default assumes "%d" as format.
209 String_convert::int_string (int i, char const *fmt)
211 char buffer[STRING_BUFFER_LEN];
212 snprintf (buffer, STRING_BUFFER_LEN,
213 (fmt ? fmt : "%d"), i); // assume radix 10
214 return std::string (buffer);
218 String_convert::form_string (char const *format, ...)
221 va_start (args, format);
222 char buffer[STRING_BUFFER_LEN];
223 vsnprintf (buffer, STRING_BUFFER_LEN, format, args);
225 return std::string (buffer);
229 String_convert::vform_string (char const *format, va_list args)
231 char buffer[STRING_BUFFER_LEN];
232 vsnprintf (buffer, STRING_BUFFER_LEN, format, args);
233 return std::string (buffer);
237 Convert a double to a string.
239 @param #fmt# is a printf style format, default assumes "%lf" as format
242 String_convert::double_string (double f, char const *fmt)
244 char buf[STRING_BUFFER_LEN];
246 snprintf (buf, STRING_BUFFER_LEN, fmt ? fmt : "%f", f);
247 return std::string (buf);
251 Make a string from a single character.
254 #n# is a repetition count, default value is 1
257 String_convert::char_string (char c, int n)
260 char *ch = new char[ n ];
263 std::string s (ch, n);
265 std::string s (ch, n);
272 String_convert::rational_string (Rational r)
274 return r.to_string ();
278 String_convert::pointer_string (void const *l)
280 char buffer[STRING_BUFFER_LEN];
281 snprintf (buffer, STRING_BUFFER_LEN, "%p", l); // assume radix 10
282 return std::string (buffer);
286 Convert a double to a string.
289 #n# is the number of nonzero digits
292 String_convert::precision_string (double x, int n)
294 std::string format = "%." + to_string (max (0, n - 1)) + "e";
295 std::string str = double_string (abs (x), format.c_str ());
297 int exp = dec2int (str.substr (str.length () - 3));
298 str = str.substr (0, str.length () - 4);
300 while (str[str.length () - 1] == '0')
301 str = str.substr (0, str.length () - 1);
302 if (str[str.length () - 1] == '.')
303 str = str.substr (0, str.length () - 1);
306 return (sign (x) > 0 ? str : "-" + str);
308 str = str.substr (0, 1) + str.substr (2);
311 str = "0." + to_string ('0', -dot) + str;
312 else if (dot >= str.length ())
313 str += to_string ('0', dot - str.length ());
314 else if ((dot > 0) && (dot < str.length ()))
315 str = str.substr (0, dot) + "." + str.substr (dot);
319 return (sign (x) > 0 ? str : "-" + str);
323 String_convert::split (std::string str, char c)
325 Array<std::string> a;
326 ssize i = str.find (c);
329 std::string s = str.substr (0, i);
331 while (str[++i] == c)
333 str = str.substr (i);
342 String_convert::long_string (long l)
344 char s[STRING_BUFFER_LEN];
345 sprintf (s, "%ld", l);
350 String_convert::pad_to (std::string s, int n)
352 return s + std::string (max (int(n - s.length ()), 0), ' ');
356 String_convert::to_upper (std::string s)
358 return strnupr ((char *)s.c_str (), s.length ());
362 String_convert::to_lower (std::string s)
364 return strnlwr ((char *)s.c_str (), s.length ());
368 String_convert::reverse (std::string s)
370 return (char*) memrev ((unsigned char *)s.data (), s.length ());