340 lines
7.1 KiB
C
340 lines
7.1 KiB
C
/*-
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static char sccsid[] = "@(#)str.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include <sys/cdefs.h>
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#include <sys/types.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 __P((STR *));
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static int bracket __P((STR *));
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static int c_class __P((const void *, const void *));
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static void genclass __P((STR *));
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static void genequiv __P((STR *));
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static int genrange __P((STR *));
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static void genseq __P((STR *));
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int
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next(s)
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register STR *s;
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{
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register 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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}
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static int
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bracket(s)
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register STR *s;
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{
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register 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] != '*' || index(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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char *name;
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int (*func) __P((int));
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int *set;
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} CLASS;
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static CLASS classes[] = {
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#undef isalnum
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{ "alnum", isalnum, },
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#undef isalpha
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{ "alpha", isalpha, },
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#undef isblank
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{ "blank", isblank, },
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#undef iscntrl
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{ "cntrl", iscntrl, },
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#undef isdigit
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{ "digit", isdigit, },
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#undef isgraph
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{ "graph", isgraph, },
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#undef islower
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{ "lower", islower, },
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#undef isprint
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{ "print", isprint, },
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#undef ispunct
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{ "punct", ispunct, },
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#undef isspace
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{ "space", isspace, },
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#undef isupper
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{ "upper", isupper, },
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#undef isxdigit
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{ "xdigit", isxdigit, },
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};
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static void
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genclass(s)
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STR *s;
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{
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register int cnt, (*func) __P((int));
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CLASS *cp, tmp;
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int *p;
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tmp.name = s->str;
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if ((cp = (CLASS *)bsearch(&tmp, classes, sizeof(classes) /
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sizeof(CLASS), sizeof(CLASS), c_class)) == NULL)
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err("unknown class %s", s->str);
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if ((cp->set = p = malloc((NCHARS + 1) * sizeof(int))) == NULL)
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err("%s", strerror(errno));
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bzero(p, (NCHARS + 1) * sizeof(int));
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for (cnt = 0, func = cp->func; cnt < NCHARS; ++cnt)
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if ((func)(cnt))
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*p++ = cnt;
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*p = OOBCH;
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s->cnt = 0;
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s->state = SET;
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s->set = cp->set;
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}
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static int
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c_class(a, b)
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const void *a, *b;
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{
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return (strcmp(((CLASS *)a)->name, ((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(s)
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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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err("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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err("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(s)
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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 < 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(s)
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STR *s;
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{
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char *ep;
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if (s->which == STRING1)
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err("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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err("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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err("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(s)
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register STR *s;
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{
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register 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 '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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