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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 2018, Joyent, Inc.
*/
#include <sys/types.h>
#include <stdlib.h>
#include "utility.h"
/* this code was taken from regcmp(3C) */
#define SSIZE 16
#define TGRP 48
#define A256 02
#define ZERO 01
#define NBRA 10
#define CIRCFL 32;
#define SLOP 5
#define FEOF 0 /* This was originally EOF but it clashes with the header */
/* definition so it was changed to FEOF */
#define CBRA 60
#define GRP 40
#define SGRP 56
#define PGRP 68
#define EGRP 44
#define RNGE 03
#define CCHR 20
#define CDOT 64
#define CCL 24
#define NCCL 8
#define CDOL 28
#define FCEOF 52 /* This was originally CEOF but it clashes with the header */
/* definition so it was changed to FCEOF */
#define CKET 12
#define STAR 01
#define PLUS 02
#define MINUS 16
intptr_t *__sp_;
intptr_t *__stmax;
extern int __i_size;
/*ARGSUSED2*/
char *
libform_regcmp(char *cs1, char *cs2)
{
char c;
char *ep, *sp;
int *adx;
int i, cflg;
char *lastep, *sep, *eptr;
int nbra, ngrp;
int cclcnt;
intptr_t stack[SSIZE];
__sp_ = stack;
*__sp_ = -1;
__stmax = &stack[SSIZE];
adx = (int *)&cs1;
i = nbra = ngrp = 0;
while (*adx)
i += __size((char *)(intptr_t)*adx++);
adx = (int *)&cs1;
sp = (char *)(intptr_t)*adx++;
if ((sep = ep = malloc((unsigned)(2 * i + SLOP))) == NULL)
return (NULL);
if ((c = *sp++) == FEOF)
goto cerror;
if (c == '^') {
c = *sp++;
*ep++ = CIRCFL;
}
if ((c == '*') || (c == '+') || (c == '{'))
goto cerror;
sp--;
for (;;) {
if ((c = *sp++) == FEOF) {
if (*adx) {
sp = (char *)(intptr_t)*adx++;
continue;
}
*ep++ = FCEOF;
if (--nbra > NBRA || *__sp_ != -1)
goto cerror;
__i_size = (int)(ep - sep);
return (sep);
}
if ((c != '*') && (c != '{') && (c != '+'))
lastep = ep;
switch (c) {
case '(':
if (!__rpush(ep)) goto cerror;
*ep++ = CBRA;
*ep++ = -1;
continue;
case ')':
if (!(eptr = (char *)__rpop())) goto cerror;
if ((c = *sp++) == '$') {
if ('0' > (c = *sp++) || c > '9')
goto cerror;
*ep++ = CKET;
*ep++ = *++eptr = nbra++;
*ep++ = (c-'0');
continue;
}
*ep++ = EGRP;
*ep++ = ngrp++;
sp--;
switch (c) {
case '+':
*eptr = PGRP;
break;
case '*':
*eptr = SGRP;
break;
case '{':
*eptr = TGRP;
break;
default:
*eptr = GRP;
continue;
}
i = (int)(ep - eptr - 2);
for (cclcnt = 0; i >= 256; cclcnt++)
i -= 256;
if (cclcnt > 3) goto cerror;
*eptr |= cclcnt;
*++eptr = (char)i;
continue;
case '\\':
*ep++ = CCHR;
if ((c = *sp++) == FEOF)
goto cerror;
*ep++ = c;
continue;
case '{':
*lastep |= RNGE;
cflg = 0;
nlim:
if ((c = *sp++) == '}') goto cerror;
i = 0;
do {
if ('0' <= c && c <= '9')
i = (i*10+(c-'0'));
else goto cerror;
} while (((c = *sp++) != '}') && (c != ','));
if (i > 255) goto cerror;
*ep++ = (char)i;
if (c == ',') {
if (cflg++) goto cerror;
if ((c = *sp++) == '}') {
*ep++ = -1;
continue;
} else {
sp--;
goto nlim;
}
}
if (!cflg)
*ep++ = (char)i;
else if ((ep[-1]&0377) < (ep[-2]&0377))
goto cerror;
continue;
case '.':
*ep++ = CDOT;
continue;
case '+':
if (*lastep == CBRA || *lastep == CKET)
goto cerror;
*lastep |= PLUS;
continue;
case '*':
if (*lastep == CBRA || *lastep == CKET)
goto cerror;
*lastep |= STAR;
continue;
case '$':
if ((*sp != FEOF) || (*adx))
goto defchar;
*ep++ = CDOL;
continue;
case '[':
*ep++ = CCL;
*ep++ = 0;
cclcnt = 1;
if ((c = *sp++) == '^') {
c = *sp++;
ep[-2] = NCCL;
}
do {
if (c == FEOF)
goto cerror;
if ((c == '-') && (cclcnt > 1) &&
(*sp != ']')) {
*ep = ep[-1];
ep++;
ep[-2] = MINUS;
cclcnt++;
continue;
}
*ep++ = c;
cclcnt++;
} while ((c = *sp++) != ']');
lastep[1] = (char)cclcnt;
continue;
defchar:
default:
*ep++ = CCHR;
*ep++ = c;
}
}
cerror:
free(sep);
return (0);
}
int
__size(char *strg)
{
int i;
i = 1;
while (*strg++)
i++;
return (i);
}
intptr_t
__rpop(void)
{
return ((*__sp_ == -1)?0:*__sp_--);
}
int
__rpush(char *ptr)
{
if (__sp_ >= __stmax)
return (0);
*++__sp_ = (intptr_t)ptr;
return (1);
}
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