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typedef struct memblk {
char*p; /* where it starts */
long len; /* current size, not including trailing NUL */
#ifdef USE_MMAP
off_t filelen; /* how long is the file */
int fd; /* file which is mmap()ed */
#endif
} memblk;
typedef char*(read_func_type) P((char*,long,void*));
typedef int(cleanup_func_type) P((memblk*,long*,long,void*));
void
makeblock P((memblk*const,const long)), /* create block of the given length */
freeblock P((memblk*const)), /* deallocate it */
lockblock P((memblk*const)); /* protect this block from future changes */
int /* by this process */
resizeblock P((memblk*const,const long,const int)); /* change the size */
char /* dynamically grow a block to fit data as it comes in */
*read2blk P((memblk*const,long*const,read_func_type*,cleanup_func_type*,void*));
#ifdef USE_MMAP
extern int ISprivate; /* is themail a private copy or shared? */
#define isprivate (themail.fd<0||ISprivate)
#define private(x) (ISprivate=(x))
#else
#define isprivate 1
#define private(x) 1
#endif
extern memblk themail;
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