/* Definitions for data structures callers pass the regex library.
   Copyright (C) 1985 Richard M. Stallman

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#ifndef RE_NREGS
#define RE_NREGS 10
#endif

/* This data structure is used to represent a compiled pattern. */

struct re_pattern_buffer
  {
    char *buffer;	/* Space holding the compiled pattern commands. */
    int allocated;	/* Size of space that  buffer  points to */
    int used;		/* Length of portion of buffer actually occupied */
    char *fastmap;	/* Pointer to fastmap, if any, or zero if none. */
			/* re_search uses the fastmap, if there is one,
			   to skip quickly over totally implausible characters */
    char *translate;	/* Translate table to apply to all characters before comparing.
			   Or zero for no translation.
			   The translation is applied to a pattern when it is compiled
			   and to data when it is matched. */
    char fastmap_accurate;
			/* Set to zero when a new pattern is stored,
			   set to one when the fastmap is updated from it. */
    char can_be_null;   /* Set to one by compiling fastmap
			   if this pattern might match the null string.
			   It does not necessarily match the null string
			   in that case, but if this is zero, it cannot.  */
  };

/* Structure to store "register" contents data in.

   Pass the address of such a structure as an argument to re_match, etc.,
   if you want this information back.

   start[i] and end[i] record the string matched by \( ... \) grouping i,
   for i from 1 to RE_NREGS - 1.
   start[0] and end[0] record the entire string matched. */

struct re_registers
  {
    int start[RE_NREGS];
    int end[RE_NREGS];
  };

char *re_compile_pattern ();