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Annotation of researchv10no/cmd/odist/pax/include/stak.h, revision 1.1.1.1

1.1       root        1: #ifndef STAK_SMALL
                      2: /*
                      3:  * David Korn
                      4:  * AT&T Bell Laboratories
                      5:  *
                      6:  * Interface definitions for a stack-like storage library
                      7:  *
                      8:  */
                      9: 
                     10: #if defined(__STDC__) || __cplusplus || c_plusplus
                     11: #   define __ARGS(args)        args
                     12: #else
                     13: #    define const      /*empty*/
                     14: #   define __ARGS(args)        ()
                     15: #endif
                     16: 
                     17: typedef struct _stak_
                     18: {
                     19:        int             stakleft;       /* number of bytes left in frame */
                     20:        char            *staktop;       /* current stack location */
                     21:        char            *stakbot;       /* last returned stack location */
                     22:        short           stakref;        /* reference count */
                     23: #ifdef _STAK_PRIVATE
                     24:        _STAK_PRIVATE
                     25: #endif /* _STAK_PRIVATE */
                     26: } Stak_t;
                     27: 
                     28: #define STAK_SMALL     1       /* argument to stakcreate */
                     29: 
                     30: #if __cplusplus
                     31:     extern "C"
                     32:     {
                     33: #endif
                     34:        extern Stak_t   *stakcreate __ARGS((int));
                     35:        extern Stak_t   *stakinstall __ARGS((Stak_t*, char *(*)(int)));
                     36:        extern int      stakdelete __ARGS((Stak_t*));
                     37:        extern char     *stakalloc __ARGS((unsigned));
                     38:        extern char     *stakcopy __ARGS((const char*));
                     39:        extern char     *stakset __ARGS((char*, unsigned));
                     40:        extern char     *stakseek __ARGS((unsigned));
                     41:        extern int      stakputs __ARGS((const char*));
                     42:        extern char     *stakfreeze __ARGS((unsigned));
                     43:        extern char     *_stakgrow __ARGS((unsigned));
                     44: #if __cplusplus
                     45:     }
                     46: #endif
                     47: 
                     48: extern Stak_t          _stak_cur;      /* used by macros */
                     49: 
                     50: #define        staklink(sp)    ((sp)->stakref++)
                     51: #define        stakptr(n)      (_stak_cur.stakbot+(n))
                     52: #define        staktell()      (_stak_cur.staktop-_stak_cur.stakbot)
                     53: #define stakputc(c)    ((--_stak_cur.stakleft<0? _stakgrow(1):0), \
                     54:                                        *_stak_cur.staktop++=(c))
                     55: 
                     56: #endif /* STAK_SMALL */

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