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	regcomp.h - 9base - revived minimalist port of Plan 9 userland to Unix
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	regcomp.h (2091B)
	---
	1 /*
	2 * substitution list
	3 */
	4 #define uchar __reuchar
	5 typedef unsigned char uchar;
	6 #define nelem(x) (sizeof(x)/sizeof((x)[0]))
	7
	8 #define NSUBEXP 32
	9 typedef struct Resublist Resublist;
	10 struct Resublist
	11 {
	12 Resub m[NSUBEXP];
	13 };
	14
	15 /* max character classes per program */
	16 extern Reprog RePrOg;
	17 #define NCLASS (sizeof(RePrOg.class)/sizeof(Reclass))
	18
	19 /* max rune ranges per character class */
	20 #define NCCRUNE (sizeof(Reclass)/sizeof(Rune))
	21
	22 /*
	23 * Actions and Tokens (Reinst types)
	24 *
	25 * 02xx are operators, value == precedence
	26 * 03xx are tokens, i.e. operands for operators
	27 */
	28 #define RUNE 0177
	29 #define OPERATOR 0200 /* Bitmask of all operators */
	30 #define START 0200 /* Start, used for marke…
	31 #define RBRA 0201 /* Right bracket, ) */
	32 #define LBRA 0202 /* Left bracket, ( */
	33 #define OR 0203 /* Alternation, \| */
	34 #define CAT 0204 /* Concatentation, implici…
	35 #define STAR 0205 /* Closure, * */
	36 #define PLUS 0206 /* a+ == aa* */
	37 #define QUEST 0207 /* a? == a\|nothing, i.e.…
	38 #define ANY 0300 /* Any character except ne…
	39 #define ANYNL 0301 /* Any character includi…
	40 #define NOP 0302 /* No operation, internal …
	41 #define BOL 0303 /* Beginning of line, ^ */
	42 #define EOL 0304 /* End of line, $ */
	43 #define CCLASS 0305 /* Character class, [] …
	44 #define NCCLASS 0306 /* Negated character c…
	45 #define END 0377 /* Terminate: match found …
	46
	47 /*
	48 * regexec execution lists
	49 */
	50 #define LISTSIZE 10
	51 #define BIGLISTSIZE (10*LISTSIZE)
	52 typedef struct Relist Relist;
	53 struct Relist
	54 {
	55 Reinst* inst; /* Reinstruction of …
	56 Resublist se; /* matched subexpressions in…
	57 };
	58 typedef struct Reljunk Reljunk;
	59 struct Reljunk
	60 {
	61 Relist* relist[2];
	62 Relist* reliste[2];
	63 int starttype;
	64 Rune startchar;
	65 char* starts;
	66 char* eol;
	67 Rune* rstarts;
	68 Rune* reol;
	69 };
	70
	71 extern Relist* _renewthread(Relist, Reinst, int, Resublist*);
	72 extern void _renewmatch(Resub, int, Resublist);
	73 extern Relist* _renewemptythread(Relist, Reinst, int, char*);
	74 extern Relist* _rrenewemptythread(Relist, Reinst, int, Rune*);