454 lines
8.7 KiB
C
454 lines
8.7 KiB
C
/* $NetBSD: str.c,v 1.30 2018/05/26 11:20:30 leot Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)str.c 8.2 (Berkeley) 4/28/95";
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#endif
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__RCSID("$NetBSD: str.c,v 1.30 2018/05/26 11:20:30 leot Exp $");
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#endif /* not lint */
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <assert.h>
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#include "extern.h"
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struct str {
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enum { STRING1, STRING2 } which;
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enum { EOS, INFINITE, NORMAL, RANGE, SEQUENCE, SET } state;
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int cnt; /* character count */
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int lastch; /* last character */
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int equiv[2]; /* equivalence set */
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int *set; /* set of characters */
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const char *str; /* user's string */
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};
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static int backslash(STR *);
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static int bracket(STR *);
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static int c_class(const void *, const void *);
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static int *genclass(const char *, size_t);
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static void genequiv(STR *);
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static int genrange(STR *);
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static void genseq(STR *);
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STR *
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str_create(int whichstring, const char *txt)
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{
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STR *s;
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s = malloc(sizeof(*s));
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if (s == NULL) {
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err(1, "Out of memory");
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}
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s->which = whichstring == 2 ? STRING2 : STRING1;
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s->state = NORMAL;
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s->cnt = 0;
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s->lastch = OOBCH;
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s->equiv[0] = 0;
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s->equiv[1] = OOBCH;
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s->set = NULL;
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s->str = txt;
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return s;
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}
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void
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str_destroy(STR *s)
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{
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if (s->set != NULL && s->set != s->equiv) {
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free(s->set);
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}
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free(s);
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}
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int
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next(STR *s, int *ret)
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{
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int ch;
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switch (s->state) {
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case EOS:
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*ret = s->lastch;
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return 0;
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case INFINITE:
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*ret = s->lastch;
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return 1;
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case NORMAL:
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ch = (unsigned char)s->str[0];
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switch (ch) {
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case '\0':
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s->state = EOS;
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*ret = s->lastch;
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return 0;
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case '\\':
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s->lastch = backslash(s);
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break;
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case '[':
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if (bracket(s)) {
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return next(s, ret);
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}
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/* FALLTHROUGH */
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default:
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++s->str;
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s->lastch = ch;
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break;
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}
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/* We can start a range at any time. */
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if (s->str[0] == '-' && genrange(s)) {
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return next(s, ret);
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}
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*ret = s->lastch;
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return 1;
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case RANGE:
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if (s->cnt == 0) {
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s->state = NORMAL;
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return next(s, ret);
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}
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s->cnt--;
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++s->lastch;
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*ret = s->lastch;
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return 1;
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case SEQUENCE:
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if (s->cnt == 0) {
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s->state = NORMAL;
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return next(s, ret);
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}
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s->cnt--;
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*ret = s->lastch;
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return 1;
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case SET:
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s->lastch = s->set[s->cnt++];
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if (s->lastch == OOBCH) {
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s->state = NORMAL;
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if (s->set != s->equiv) {
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free(s->set);
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}
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s->set = NULL;
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return next(s, ret);
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}
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*ret = s->lastch;
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return 1;
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}
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/* NOTREACHED */
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assert(0);
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*ret = s->lastch;
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return 0;
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}
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static int
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bracket(STR *s)
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{
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const char *p;
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int *q;
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switch (s->str[1]) {
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case ':': /* "[:class:]" */
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if ((p = strstr(s->str + 2, ":]")) == NULL)
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return 0;
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s->str += 2;
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q = genclass(s->str, p - s->str);
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s->state = SET;
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s->set = q;
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s->cnt = 0;
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s->str = p + 2;
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return 1;
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case '=': /* "[=equiv=]" */
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if ((p = strstr(s->str + 2, "=]")) == NULL)
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return 0;
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s->str += 2;
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genequiv(s);
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s->str = p + 2;
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return 1;
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default: /* "[\###*n]" or "[#*n]" */
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if ((p = strpbrk(s->str + 2, "*]")) == NULL)
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return 0;
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if (p[0] != '*' || strchr(p, ']') == NULL)
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return 0;
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s->str += 1;
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genseq(s);
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return 1;
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}
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/* NOTREACHED */
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}
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typedef struct {
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const char *name;
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int (*func)(int);
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} CLASS;
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static const CLASS classes[] = {
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{ "alnum", isalnum },
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{ "alpha", isalpha },
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{ "blank", isblank },
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{ "cntrl", iscntrl },
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{ "digit", isdigit },
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{ "graph", isgraph },
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{ "lower", islower },
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{ "print", isprint },
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{ "punct", ispunct },
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{ "space", isspace },
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{ "upper", isupper },
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{ "xdigit", isxdigit },
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};
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typedef struct {
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const char *name;
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size_t len;
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} CLASSKEY;
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static int *
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genclass(const char *class, size_t len)
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{
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int ch;
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const CLASS *cp;
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CLASSKEY key;
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int *p;
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unsigned pos, num;
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/* Find the class */
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key.name = class;
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key.len = len;
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cp = bsearch(&key, classes, __arraycount(classes), sizeof(classes[0]),
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c_class);
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if (cp == NULL) {
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errx(1, "unknown class %.*s", (int)len, class);
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}
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/*
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* Figure out what characters are in the class
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*/
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num = NCHARS + 1;
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p = malloc(num * sizeof(*p));
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if (p == NULL) {
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err(1, "malloc");
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}
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pos = 0;
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for (ch = 0; ch < NCHARS; ch++) {
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if (cp->func(ch)) {
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p[pos++] = ch;
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}
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}
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p[pos++] = OOBCH;
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for (; pos < num; pos++) {
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p[pos] = 0;
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}
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return p;
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}
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static int
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c_class(const void *av, const void *bv)
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{
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const CLASSKEY *a = av;
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const CLASS *b = bv;
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size_t blen;
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int r;
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blen = strlen(b->name);
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r = strncmp(a->name, b->name, a->len);
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if (r != 0) {
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return r;
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}
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if (a->len < blen) {
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/* someone gave us a prefix of the right name */
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return -1;
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}
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assert(a-> len == blen);
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return 0;
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}
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/*
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* English doesn't have any equivalence classes, so for now
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* we just syntax check and grab the character.
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*/
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static void
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genequiv(STR *s)
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{
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int ch;
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ch = (unsigned char)s->str[0];
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if (ch == '\\') {
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s->equiv[0] = backslash(s);
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} else {
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s->equiv[0] = ch;
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s->str++;
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}
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if (s->str[0] != '=') {
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errx(1, "Misplaced equivalence equals sign");
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}
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s->str++;
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if (s->str[0] != ']') {
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errx(1, "Misplaced equivalence right bracket");
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}
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s->str++;
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s->cnt = 0;
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s->state = SET;
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s->set = s->equiv;
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}
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static int
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genrange(STR *s)
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{
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int stopval;
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const char *savestart;
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savestart = s->str++;
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stopval = s->str[0] == '\\' ? backslash(s) : (unsigned char)*s->str++;
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if (stopval < (unsigned char)s->lastch) {
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s->str = savestart;
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return 0;
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}
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s->cnt = stopval - s->lastch + 1;
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s->state = RANGE;
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--s->lastch;
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return 1;
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}
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static void
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genseq(STR *s)
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{
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char *ep;
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if (s->which == STRING1) {
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errx(1, "Sequences only valid in string2");
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}
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if (*s->str == '\\') {
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s->lastch = backslash(s);
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} else {
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s->lastch = (unsigned char)*s->str++;
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}
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if (*s->str != '*') {
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errx(1, "Misplaced sequence asterisk");
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}
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s->str++;
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switch (s->str[0]) {
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case '\\':
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s->cnt = backslash(s);
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break;
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case ']':
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s->cnt = 0;
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++s->str;
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break;
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default:
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if (isdigit((unsigned char)s->str[0])) {
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s->cnt = strtol(s->str, &ep, 0);
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if (*ep == ']') {
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s->str = ep + 1;
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break;
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}
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}
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errx(1, "illegal sequence count");
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/* NOTREACHED */
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}
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s->state = s->cnt ? SEQUENCE : INFINITE;
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}
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/*
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* Translate \??? into a character. Up to 3 octal digits, if no digits either
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* an escape code or a literal character.
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*/
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static int
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backslash(STR *s)
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{
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int ch, cnt, val;
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cnt = val = 0;
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for (;;) {
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/* Consume the character we're already on. */
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s->str++;
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/* Look at the next character. */
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ch = (unsigned char)s->str[0];
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if (!isascii(ch) || !isdigit(ch)) {
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break;
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}
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val = val * 8 + ch - '0';
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if (++cnt == 3) {
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/* Enough digits; consume this one and stop */
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++s->str;
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break;
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}
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}
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if (cnt) {
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/* We saw digits, so return their value */
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if (val >= OOBCH)
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errx(1, "Invalid octal character value");
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return val;
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}
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if (ch == '\0') {
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/* \<end> -> \ */
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s->state = EOS;
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return '\\';
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}
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/* Consume the escaped character */
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s->str++;
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switch (ch) {
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case 'a': /* escape characters */
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return '\7';
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case 'b':
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return '\b';
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case 'e':
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return '\033';
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case 'f':
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return '\f';
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case 'n':
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return '\n';
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case 'r':
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return '\r';
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case 't':
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return '\t';
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case 'v':
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return '\13';
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default: /* \q -> q */
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return ch;
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}
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}
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