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#ifndef SHSTR_H__ |
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#define SHSTR_H__ |
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#include <sstream> |
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#include "util.h" |
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extern int buf_overflow (const char *buf1, const char *buf2, int bufsize); |
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struct shstr |
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{ |
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static const char *null; |
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const char *s; |
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static int &refcnt (const char *s) |
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{ |
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return *((int *)s - 1); |
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} |
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static int &length (const char *s) |
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{ |
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return *((int *)s - 2); |
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} |
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int &refcnt () const |
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{ |
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return refcnt (s); |
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} |
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int length () const |
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{ |
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return length (s); |
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} |
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static const char *find (const char *s); |
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static const char *intern (const char *s); |
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static void gc (); // garbage collect a few strings |
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// this is used for informational messages and the like |
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const char *operator &() const { return s; } |
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const char &operator [](int i) const { return s[i]; } |
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operator const char *() const { return s == null ? 0 : s; } |
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shstr () |
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: s (null) |
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{ |
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} |
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shstr (const shstr &sh) |
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: s (sh.s) |
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{ |
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++refcnt (); |
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} |
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explicit shstr (const char *s) |
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: s (intern (s)) |
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{ |
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} |
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~shstr () |
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{ |
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--refcnt (); |
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} |
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const shstr &operator =(const shstr &sh) |
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{ |
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--refcnt (); |
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s = sh.s; |
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++refcnt (); |
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return *this; |
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} |
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const shstr &operator =(const char *str) |
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{ |
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--refcnt (); |
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// this optimises the important case of str == constant 0 |
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if (is_constant (str)) |
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s = str ? intern (str) : null; |
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else |
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s = intern (str); |
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return *this; |
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} |
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bool operator ==(const shstr &b) |
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{ |
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return s == b.s; |
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} |
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bool operator !=(const shstr &b) |
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{ |
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return !(*this == b); |
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} |
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}; |
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inline int strlen (const shstr &sh) |
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{ |
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return sh.length (); |
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} |
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inline int strcmp (const shstr &a, const shstr &b) |
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{ |
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// TODO: use this to find all the occurences of people using strcmp |
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// all uses should be bogus, as we should be never interested in |
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// comparing shstr's alphabetically |
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#if 0 |
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extern void do_not_use_strcmp_to_compare_shstr_values (); |
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do_not_use_strcmp_to_compare_shstr_values (); |
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#endif |
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return a != b; |
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} |
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static std::ostream &operator <<(std::ostream &o, const shstr &sh) |
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{ |
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o.write (sh.s, sh.length ()); |
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return o; |
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} |
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// only good for mass comparisons to shstr objects |
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struct shstr_cmp |
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{ |
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const char *s; |
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explicit shstr_cmp (const char *s) |
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: s (shstr::find (s)) |
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{ |
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} |
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shstr_cmp (const shstr_cmp &sh) |
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: s (sh.s) |
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{ |
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} |
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shstr_cmp &operator =(const shstr_cmp sh) { s = sh.s; return *this; } |
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operator const char *() const { return s; } |
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}; |
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inline bool operator ==(const shstr_cmp &a, const shstr &b) |
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{ |
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return a.s == b.s; |
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} |
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inline bool operator ==(const shstr &a, const shstr_cmp &b) |
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{ |
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return b == a; |
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} |
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extern const shstr undead_name; /* Used in hit_player() in main.c */ |
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#endif |
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