325 lines
6.7 KiB
C
325 lines
6.7 KiB
C
/* $NetBSD: str.c,v 1.19 2011/09/08 12:00:26 christos 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 1.19 2011/09/08 12:00:26 christos 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 "extern.h"
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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 void genclass(STR *);
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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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int
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next(STR *s)
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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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return 0;
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case INFINITE:
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return 1;
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case NORMAL:
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switch (ch = *s->str) {
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case '\0':
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s->state = EOS;
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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);
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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);
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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);
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}
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++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);
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}
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return 1;
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case SET:
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if ((s->lastch = s->set[s->cnt++]) == OOBCH) {
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s->state = NORMAL;
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return next(s);
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}
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return 1;
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}
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/* NOTREACHED */
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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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char *p;
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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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*p = '\0';
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s->str += 2;
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genclass(s);
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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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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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static void
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genclass(STR *s)
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{
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int cnt;
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const CLASS *cp;
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CLASS tmp;
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int *p;
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tmp.name = s->str;
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if ((cp = bsearch(&tmp, classes, sizeof(classes) /
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sizeof(*cp), sizeof(*cp), c_class)) == NULL)
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errx(1, "unknown class %s", s->str);
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if ((s->set = p = malloc((NCHARS + 1) * sizeof(*p))) == NULL)
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err(1, "malloc");
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for (cnt = 0; cnt < NCHARS; ++cnt)
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if ((*cp->func)(cnt))
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*p++ = cnt;
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*p++ = OOBCH;
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memset(p, 0, NCHARS + 1 - (p - s->set));
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s->cnt = 0;
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s->state = SET;
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}
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static int
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c_class(const void *a, const void *b)
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{
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return strcmp(((const CLASS *)a)->name, ((const CLASS *)b)->name);
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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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if (*s->str == '\\') {
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s->equiv[0] = backslash(s);
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if (*s->str != '=')
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errx(1, "misplaced equivalence equals sign");
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} else {
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s->equiv[0] = s->str[0];
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if (s->str[1] != '=')
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errx(1, "misplaced equivalence equals sign");
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}
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s->str += 2;
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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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char *savestart;
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savestart = s->str;
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stopval = *++s->str == '\\' ? backslash(s) : *s->str++;
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if (stopval < (u_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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if (*s->str == '\\')
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s->lastch = backslash(s);
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else
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s->lastch = *s->str++;
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if (*s->str != '*')
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errx(1, "misplaced sequence asterisk");
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switch (*++s->str) {
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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(*s->str)) {
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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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for (cnt = val = 0;;) {
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ch = *++s->str;
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if (!isascii(ch) || !isdigit(ch))
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break;
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val = val * 8 + ch - '0';
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if (++cnt == 3) {
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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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return val;
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if (ch != '\0')
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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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case '\0': /* \" -> \ */
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s->state = EOS;
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return '\\';
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default: /* \x" -> x */
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return ch;
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}
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}
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