1 | #ifndef RXVT_UTIL_H |
1 | #ifndef RXVT_UTIL_H |
2 | #define RXVT_UTIL_H |
2 | #define RXVT_UTIL_H |
3 | |
3 | |
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4 | #include <cstdlib> |
4 | #include <cstring> |
5 | #include <cstring> |
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6 | |
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7 | #define PP_CONCAT_(a, b) a ## b |
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8 | #define PP_CONCAT(a, b) PP_CONCAT_(a, b) |
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9 | #define PP_STRINGIFY_(a) #a |
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10 | #define PP_STRINGIFY(a) PP_STRINGIFY_(a) |
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11 | |
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12 | // actually, some gcc-3.x versions work, too |
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13 | #define HAVE_GCC_BUILTINS (__GNUC__ >= 4) |
5 | |
14 | |
6 | extern class byteorder { |
15 | extern class byteorder { |
7 | static unsigned int e; // at least 32 bits |
16 | static unsigned int e; // at least 32 bits |
8 | public: |
17 | public: |
9 | byteorder (); |
18 | byteorder (); |
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12 | static bool network () { return e == 0x11223344; }; |
21 | static bool network () { return e == 0x11223344; }; |
13 | static bool little_endian () { return e == 0x44332211; }; |
22 | static bool little_endian () { return e == 0x44332211; }; |
14 | static bool vax () { return e == 0x44332211; }; |
23 | static bool vax () { return e == 0x44332211; }; |
15 | } byteorder; |
24 | } byteorder; |
16 | |
25 | |
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26 | // various utility functions |
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27 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
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28 | template<typename T, typename U> static inline void min_it (T &a, U b) { a = a < (T)b ? a : (T)b; } |
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29 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
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30 | template<typename T, typename U> static inline void max_it (T &a, U b) { a = a > (T)b ? a : (T)b; } |
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31 | |
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32 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; } |
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33 | template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = v < (T)a ? a : v >(T)b ? b : v; } |
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34 | |
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35 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
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36 | |
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37 | // linear interpolation |
17 | template<typename T, typename U> |
38 | template<typename T, typename U, typename P> |
18 | static inline T min (T a, U b) { return a < b ? a : (T)b; } |
39 | static inline |
19 | template<typename T, typename U> |
40 | T lerp (T a, U b, P p) |
20 | static inline T max (T a, U b) { return a > b ? a : (T)b; } |
41 | { |
21 | template<typename T> |
42 | return (int(a) * int(p) + int(b) * int(100 - p)) / 100; |
22 | static inline void swap (T& a, T& b) { T t=a; a=b; b=t; } |
43 | } |
23 | |
44 | |
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45 | // some bit functions, xft fuck me plenty |
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46 | #if HAVE_GCC_BUILTINS |
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47 | static inline int ctz (unsigned int x) { return __builtin_ctz (x); } |
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48 | static inline int popcount (unsigned int x) { return __builtin_popcount (x); } |
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49 | #else |
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50 | // count trailing zero bits and count # of one bits |
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51 | int ctz (unsigned int x); |
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52 | int popcount (unsigned int x); |
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53 | #endif |
24 | |
54 | |
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55 | // in range including end |
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56 | #define IN_RANGE_INC(val,beg,end) \ |
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57 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
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58 | |
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59 | // in range excluding end |
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60 | #define IN_RANGE_EXC(val,beg,end) \ |
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61 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
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62 | |
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63 | // makes dynamically allocated objects zero-initialised |
25 | struct zero_initialized { |
64 | struct zero_initialized { |
26 | void *operator new (size_t s); |
65 | void *operator new (size_t s); |
27 | void operator delete (void *p, size_t s); |
66 | void operator delete (void *p, size_t s); |
28 | }; |
67 | }; |
29 | |
68 | |
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239 | return pos; |
278 | return pos; |
240 | } |
279 | } |
241 | void erase (iterator first, iterator last) |
280 | void erase (iterator first, iterator last) |
242 | { |
281 | { |
243 | if (last != first) { |
282 | if (last != first) { |
244 | memmove (first, last, (end ()-last)*sizeof (T)); |
283 | memmove (first, last, (end () - last) * sizeof (T)); |
245 | _last -= last - first; |
284 | _last -= last - first; |
246 | } |
285 | } |
247 | } |
286 | } |
248 | void erase (iterator pos) |
287 | void erase (iterator pos) |
249 | { |
288 | { |
250 | if (pos != end ()) { |
289 | if (pos != end ()) { |
251 | memmove (pos, pos+1, (end ()- (pos+1))*sizeof (T)); |
290 | memmove (pos, pos+1, (end () - (pos+1)) * sizeof (T)); |
252 | --_last; |
291 | --_last; |
253 | } |
292 | } |
254 | } |
293 | } |
255 | void swap (simplevec<T> &t) |
294 | void swap (simplevec<T> &t) |
256 | { |
295 | { |
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374 | struct stringvec : simplevec<char *> |
413 | struct stringvec : simplevec<char *> |
375 | { |
414 | { |
376 | ~stringvec () |
415 | ~stringvec () |
377 | { |
416 | { |
378 | for (char **c = begin (); c != end (); c++) |
417 | for (char **c = begin (); c != end (); c++) |
379 | delete [] *c; |
418 | free (*c); |
380 | } |
419 | } |
381 | }; |
420 | }; |
382 | |
421 | |
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422 | // return a very temporary (and never deallocated) buffer. keep small. |
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423 | void *rxvt_temp_buf (int len); |
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424 | |
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425 | template<typename T> |
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426 | inline T * |
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427 | rxvt_temp_buf (int len) |
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428 | { |
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429 | return (T *)rxvt_temp_buf (len * sizeof (T)); |
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430 | } |
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431 | |
383 | #endif |
432 | #endif |
384 | |
433 | |