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	regexp.h - sam - An updated version of the sam text editor.
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	regexp.h (1521B)
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	1 /* Copyright (c) 1998 Lucent Technologies - All rights reserved. */
	2
	3 typedef struct Resub Resub;
	4 typedef struct Reclass Reclass;
	5 typedef struct Reinst Reinst;
	6 typedef struct Reprog Reprog;
	7
	8 /*
	9 * Sub expression matches
	10 */
	11 struct Resub{
	12 union
	13 {
	14 char *sp;
	15 wchar_t *rsp;
	16 }s;
	17 union
	18 {
	19 char *ep;
	20 wchar_t *rep;
	21 }e;
	22 };
	23
	24 /*
	25 * character class, each pair of rune's defines a range
	26 */
	27 struct Reclass{
	28 wchar_t *end;
	29 wchar_t spans[64];
	30 };
	31
	32 /*
	33 * Machine instructions
	34 */
	35 struct Reinst{
	36 int type;
	37 union {
	38 Reclass cp; / class pointer */
	39 wchar_t r; /* character */
	40 int subid; /* sub-expression id for RBRA and LBRA */
	41 Reinst right; / right child of OR */
	42 }u1;
	43 union { /* regexp relies on these two being in the same union */
	44 Reinst left; / left child of OR */
	45 Reinst next; / next instruction for CAT & LBRA */
	46 }u2;
	47 };
	48
	49 /*
	50 * Reprogram definition
	51 */
	52 struct Reprog{
	53 Reinst startinst; / start pc */
	54 Reclass class[16]; /* .data */
	55 Reinst firstinst[5]; /* .text */
	56 };
	57
	58 extern Reprog regcomp(char);
	59 extern Reprog regcomplit(char);
	60 extern Reprog regcompnl(char);
	61 extern void regerror(char*);
	62 extern int regexec(Reprog, char, Resub*, int);
	63 extern void regsub(char, char, Resub*, int);
	64 extern int rregexec(Reprog, wchar_t, Resub*, int);
	65 extern void rregsub(wchar_t, wchar_t, Resub*, int);