130154ac8SAndrew Moore /* re.c: This file contains the regular expression interface routines for 230154ac8SAndrew Moore the ed line editor. */ 330154ac8SAndrew Moore /*- 430154ac8SAndrew Moore * Copyright (c) 1993 The Regents of the University of California. 530154ac8SAndrew Moore * All rights reserved. 630154ac8SAndrew Moore * 730154ac8SAndrew Moore * This code is derived from software contributed to Berkeley 830154ac8SAndrew Moore * by Andrew Moore, Talke Studio. 930154ac8SAndrew Moore * 1030154ac8SAndrew Moore * Redistribution and use in source and binary forms, with or without 1130154ac8SAndrew Moore * modification, are permitted provided that the following conditions 1230154ac8SAndrew Moore * are met: 1330154ac8SAndrew Moore * 1. Redistributions of source code must retain the above copyright 1430154ac8SAndrew Moore * notice, this list of conditions and the following disclaimer. 1530154ac8SAndrew Moore * 2. Redistributions in binary form must reproduce the above copyright 1630154ac8SAndrew Moore * notice, this list of conditions and the following disclaimer in the 1730154ac8SAndrew Moore * documentation and/or other materials provided with the distribution. 1830154ac8SAndrew Moore * 3. All advertising materials mentioning features or use of this software 1930154ac8SAndrew Moore * must display the following acknowledgement: 2030154ac8SAndrew Moore * This product includes software developed by the University of 2130154ac8SAndrew Moore * California, Berkeley and its contributors. 2230154ac8SAndrew Moore * 4. Neither the name of the University nor the names of its contributors 2330154ac8SAndrew Moore * may be used to endorse or promote products derived from this software 2430154ac8SAndrew Moore * without specific prior written permission. 2530154ac8SAndrew Moore * 2630154ac8SAndrew Moore * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2730154ac8SAndrew Moore * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2830154ac8SAndrew Moore * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2930154ac8SAndrew Moore * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3030154ac8SAndrew Moore * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3130154ac8SAndrew Moore * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3230154ac8SAndrew Moore * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3330154ac8SAndrew Moore * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3430154ac8SAndrew Moore * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3530154ac8SAndrew Moore * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3630154ac8SAndrew Moore * SUCH DAMAGE. 3730154ac8SAndrew Moore */ 3830154ac8SAndrew Moore 3930154ac8SAndrew Moore #ifndef lint 4030154ac8SAndrew Moore static char sccsid[] = "@(#)re.c 5.5 (Berkeley) 3/28/93"; 4130154ac8SAndrew Moore #endif /* not lint */ 4230154ac8SAndrew Moore 4330154ac8SAndrew Moore #include <stdio.h> 4430154ac8SAndrew Moore #include <stdlib.h> 4530154ac8SAndrew Moore #include <string.h> 4630154ac8SAndrew Moore 4730154ac8SAndrew Moore #include "ed.h" 4830154ac8SAndrew Moore 4930154ac8SAndrew Moore extern char *lhbuf; 5030154ac8SAndrew Moore extern int lhbufsz; 5130154ac8SAndrew Moore extern char *ibufp; 5230154ac8SAndrew Moore extern int ibufsz; 5330154ac8SAndrew Moore extern int patlock; 5430154ac8SAndrew Moore 5530154ac8SAndrew Moore char errmsg[MAXFNAME + 40] = ""; 5630154ac8SAndrew Moore 5730154ac8SAndrew Moore /* optpat: return pointer to compiled pattern from command buffer */ 5830154ac8SAndrew Moore pattern_t * 5930154ac8SAndrew Moore optpat() 6030154ac8SAndrew Moore { 6130154ac8SAndrew Moore static pattern_t *exp = NULL; 6230154ac8SAndrew Moore 6330154ac8SAndrew Moore char *exps; 6430154ac8SAndrew Moore char delim; 6530154ac8SAndrew Moore int n; 6630154ac8SAndrew Moore 6730154ac8SAndrew Moore if ((delim = *ibufp) == '\n') { 6830154ac8SAndrew Moore if (!exp) sprintf(errmsg, "no previous pattern"); 6930154ac8SAndrew Moore return exp; 7030154ac8SAndrew Moore } else if (delim == ' ' || *++ibufp == '\n') { 7130154ac8SAndrew Moore sprintf(errmsg, "invalid pattern delimiter"); 7230154ac8SAndrew Moore return NULL; 7330154ac8SAndrew Moore } else if (*ibufp == delim) { 7430154ac8SAndrew Moore sprintf(errmsg, "no previous pattern"); 7530154ac8SAndrew Moore return exp; 7630154ac8SAndrew Moore } else if ((exps = getlhs(delim)) == NULL) 7730154ac8SAndrew Moore return NULL; 7830154ac8SAndrew Moore /* buffer alloc'd && not reserved */ 7930154ac8SAndrew Moore if (exp && !patlock) 8030154ac8SAndrew Moore regfree(exp); 8130154ac8SAndrew Moore else if ((exp = (pattern_t *) malloc(sizeof(pattern_t))) == NULL) { 8230154ac8SAndrew Moore fprintf(stderr, "%s\n", strerror(errno)); 8330154ac8SAndrew Moore sprintf(errmsg, "out of memory"); 8430154ac8SAndrew Moore return NULL; 8530154ac8SAndrew Moore } 8630154ac8SAndrew Moore patlock = 0; 8730154ac8SAndrew Moore #ifdef GNU_REGEX 8830154ac8SAndrew Moore /* initialize pattern buffer */ 8930154ac8SAndrew Moore exp->buffer = NULL; 9030154ac8SAndrew Moore exp->allocated = 0L; 9130154ac8SAndrew Moore exp->fastmap = 0; /* not used by GNU regex after 0.12 */ 9230154ac8SAndrew Moore exp->translate = 0; 9330154ac8SAndrew Moore #endif 9430154ac8SAndrew Moore if (n = regcomp(exp, exps, 0)) { 9530154ac8SAndrew Moore regerror(n, exp, errmsg, sizeof errmsg); 9630154ac8SAndrew Moore return NULL; 9730154ac8SAndrew Moore } 9830154ac8SAndrew Moore return exp; 9930154ac8SAndrew Moore } 10030154ac8SAndrew Moore 10130154ac8SAndrew Moore 10230154ac8SAndrew Moore extern int isbinary; 10330154ac8SAndrew Moore 10430154ac8SAndrew Moore /* getlhs: copy a pattern string from the command buffer; return pointer 10530154ac8SAndrew Moore to the copy */ 10630154ac8SAndrew Moore char * 10730154ac8SAndrew Moore getlhs(delim) 10830154ac8SAndrew Moore int delim; 10930154ac8SAndrew Moore { 11030154ac8SAndrew Moore char *nd; 11130154ac8SAndrew Moore int len; 11230154ac8SAndrew Moore 11330154ac8SAndrew Moore for (nd = ibufp; *nd != delim && *nd != '\n'; nd++) 11430154ac8SAndrew Moore switch (*nd) { 11530154ac8SAndrew Moore default: 11630154ac8SAndrew Moore break; 11730154ac8SAndrew Moore case '[': 11830154ac8SAndrew Moore if ((nd = ccl(++nd)) == NULL) { 11930154ac8SAndrew Moore sprintf(errmsg, "unbalanced brackets ([])"); 12030154ac8SAndrew Moore return NULL; 12130154ac8SAndrew Moore } 12230154ac8SAndrew Moore break; 12330154ac8SAndrew Moore case '\\': 12430154ac8SAndrew Moore if (*++nd == '\n') { 12530154ac8SAndrew Moore sprintf(errmsg, "trailing backslash (\\)"); 12630154ac8SAndrew Moore return NULL; 12730154ac8SAndrew Moore } 12830154ac8SAndrew Moore break; 12930154ac8SAndrew Moore } 13030154ac8SAndrew Moore len = nd - ibufp; 13130154ac8SAndrew Moore CKBUF(lhbuf, lhbufsz, len + 1, NULL); 13230154ac8SAndrew Moore memcpy(lhbuf, ibufp, len); 13330154ac8SAndrew Moore lhbuf[len] = '\0'; 13430154ac8SAndrew Moore ibufp = nd; 13530154ac8SAndrew Moore return (isbinary) ? nultonl(lhbuf, len) : lhbuf; 13630154ac8SAndrew Moore } 13730154ac8SAndrew Moore 13830154ac8SAndrew Moore 13930154ac8SAndrew Moore /* ccl: expand a POSIX character class */ 14030154ac8SAndrew Moore char * 14130154ac8SAndrew Moore ccl(s) 14230154ac8SAndrew Moore char *s; 14330154ac8SAndrew Moore { 14430154ac8SAndrew Moore int c, d; 14530154ac8SAndrew Moore 14630154ac8SAndrew Moore if (*s == '^') 14730154ac8SAndrew Moore s++; 14830154ac8SAndrew Moore if (*s == ']') 14930154ac8SAndrew Moore s++; 15030154ac8SAndrew Moore for (; *s != ']' && *s != '\n'; s++) 15130154ac8SAndrew Moore if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '=')) 15230154ac8SAndrew Moore for (s++, c = *++s; *s != ']' || c != d; s++) 15330154ac8SAndrew Moore if ((c = *s) == '\n') 15430154ac8SAndrew Moore return NULL; 15530154ac8SAndrew Moore return (*s == ']') ? s : NULL; 15630154ac8SAndrew Moore } 157