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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#ifndef lint
static const char sccsid[] = "@(#)str.c 8.2 (Berkeley) 4/28/95";
#endif
#include <sys/types.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
#include "extern.h"
static int backslash(STR *, int *);
static int bracket(STR *);
static void genclass(STR *);
static void genequiv(STR *);
static int genrange(STR *, int);
static void genseq(STR *);
wint_t
next(STR *s)
{
int is_octal;
wint_t ch;
wchar_t wch;
size_t clen;
switch (s->state) {
case EOS:
return (0);
case INFINITE:
return (1);
case NORMAL:
switch (*s->str) {
case '\0':
s->state = EOS;
return (0);
case '\\':
s->lastch = backslash(s, &is_octal);
break;
case '[':
if (bracket(s))
return (next(s));
/* FALLTHROUGH */
default:
clen = mbrtowc(&wch, s->str, MB_LEN_MAX, NULL);
if (clen == (size_t)-1 || clen == (size_t)-2 ||
clen == 0)
errc(1, EILSEQ, NULL);
is_octal = 0;
s->lastch = wch;
s->str += clen;
break;
}
/* We can start a range at any time. */
if (s->str[0] == '-' && genrange(s, is_octal))
return (next(s));
return (1);
case RANGE:
if (s->cnt-- == 0) {
s->state = NORMAL;
return (next(s));
}
++s->lastch;
return (1);
case SEQUENCE:
if (s->cnt-- == 0) {
s->state = NORMAL;
return (next(s));
}
return (1);
case CCLASS:
case CCLASS_UPPER:
case CCLASS_LOWER:
s->cnt++;
ch = nextwctype(s->lastch, s->cclass);
if (ch == -1) {
s->state = NORMAL;
return (next(s));
}
s->lastch = ch;
return (1);
case SET:
if ((ch = s->set[s->cnt++]) == OOBCH) {
s->state = NORMAL;
return (next(s));
}
s->lastch = ch;
return (1);
default:
return (0);
}
/* NOTREACHED */
}
static int
bracket(STR *s)
{
char *p;
switch (s->str[1]) {
case ':': /* "[:class:]" */
if ((p = strchr(s->str + 2, ']')) == NULL)
return (0);
if (*(p - 1) != ':' || p - s->str < 4)
goto repeat;
*(p - 1) = '\0';
s->str += 2;
genclass(s);
s->str = p + 1;
return (1);
case '=': /* "[=equiv=]" */
if (s->str[2] == '\0' || (p = strchr(s->str + 3, ']')) == NULL)
return (0);
if (*(p - 1) != '=' || p - s->str < 4)
goto repeat;
s->str += 2;
genequiv(s);
return (1);
default: /* "[\###*n]" or "[#*n]" */
repeat:
if ((p = strpbrk(s->str + 2, "*]")) == NULL)
return (0);
if (p[0] != '*' || strchr(p, ']') == NULL)
return (0);
s->str += 1;
genseq(s);
return (1);
}
/* NOTREACHED */
}
static void
genclass(STR *s)
{
if ((s->cclass = wctype(s->str)) == 0)
errx(1, "unknown class %s", s->str);
s->cnt = 0;
s->lastch = -1; /* incremented before check in next() */
if (strcmp(s->str, "upper") == 0)
s->state = CCLASS_UPPER;
else if (strcmp(s->str, "lower") == 0)
s->state = CCLASS_LOWER;
else
s->state = CCLASS;
}
static void
genequiv(STR *s)
{
int i, p, pri;
char src[2], dst[3];
size_t clen;
wchar_t wc;
if (*s->str == '\\') {
s->equiv[0] = backslash(s, NULL);
if (*s->str != '=')
errx(1, "misplaced equivalence equals sign");
s->str += 2;
} else {
clen = mbrtowc(&wc, s->str, MB_LEN_MAX, NULL);
if (clen == (size_t)-1 || clen == (size_t)-2 || clen == 0)
errc(1, EILSEQ, NULL);
s->equiv[0] = wc;
if (s->str[clen] != '=')
errx(1, "misplaced equivalence equals sign");
s->str += clen + 2;
}
/*
* Calculate the set of all characters in the same equivalence class
* as the specified character (they will have the same primary
* collation weights).
* XXX Knows too much about how strxfrm() is implemented. Assumes
* it fills the string with primary collation weight bytes. Only one-
* to-one mappings are supported.
* XXX Equivalence classes not supported in multibyte locales.
*/
src[0] = (char)s->equiv[0];
src[1] = '\0';
if (MB_CUR_MAX == 1 && strxfrm(dst, src, sizeof(dst)) == 1) {
pri = (unsigned char)*dst;
for (p = 1, i = 1; i < NCHARS_SB; i++) {
*src = i;
if (strxfrm(dst, src, sizeof(dst)) == 1 && pri &&
pri == (unsigned char)*dst)
s->equiv[p++] = i;
}
s->equiv[p] = OOBCH;
}
s->cnt = 0;
s->state = SET;
s->set = s->equiv;
}
static int
genrange(STR *s, int was_octal)
{
int stopval, octal;
char *savestart;
int n, cnt, *p;
size_t clen;
wchar_t wc;
octal = 0;
savestart = s->str;
if (*++s->str == '\\')
stopval = backslash(s, &octal);
else {
clen = mbrtowc(&wc, s->str, MB_LEN_MAX, NULL);
if (clen == (size_t)-1 || clen == (size_t)-2)
errc(1, EILSEQ, NULL);
stopval = wc;
s->str += clen;
}
/*
* XXX Characters are not ordered according to collating sequence in
* multibyte locales.
*/
if (octal || was_octal || MB_CUR_MAX > 1) {
if (stopval < s->lastch) {
s->str = savestart;
return (0);
}
s->cnt = stopval - s->lastch + 1;
s->state = RANGE;
--s->lastch;
return (1);
}
if (charcoll((const void *)&stopval, (const void *)&(s->lastch)) < 0) {
s->str = savestart;
return (0);
}
if ((s->set = p = malloc((NCHARS_SB + 1) * sizeof(int))) == NULL)
err(1, "genrange() malloc");
for (cnt = 0; cnt < NCHARS_SB; cnt++)
if (charcoll((const void *)&cnt, (const void *)&(s->lastch)) >= 0 &&
charcoll((const void *)&cnt, (const void *)&stopval) <= 0)
*p++ = cnt;
*p = OOBCH;
n = p - s->set;
s->cnt = 0;
s->state = SET;
if (n > 1)
mergesort(s->set, n, sizeof(*(s->set)), charcoll);
return (1);
}
static void
genseq(STR *s)
{
char *ep;
wchar_t wc;
size_t clen;
if (s->which == STRING1)
errx(1, "sequences only valid in string2");
if (*s->str == '\\')
s->lastch = backslash(s, NULL);
else {
clen = mbrtowc(&wc, s->str, MB_LEN_MAX, NULL);
if (clen == (size_t)-1 || clen == (size_t)-2)
errc(1, EILSEQ, NULL);
s->lastch = wc;
s->str += clen;
}
if (*s->str != '*')
errx(1, "misplaced sequence asterisk");
switch (*++s->str) {
case '\\':
s->cnt = backslash(s, NULL);
break;
case ']':
s->cnt = 0;
++s->str;
break;
default:
if (isdigit((u_char)*s->str)) {
s->cnt = strtol(s->str, &ep, 0);
if (*ep == ']') {
s->str = ep + 1;
break;
}
}
errx(1, "illegal sequence count");
/* NOTREACHED */
}
s->state = s->cnt ? SEQUENCE : INFINITE;
}
/*
* Translate \??? into a character. Up to 3 octal digits, if no digits either
* an escape code or a literal character.
*/
static int
backslash(STR *s, int *is_octal)
{
int ch, cnt, val;
if (is_octal != NULL)
*is_octal = 0;
for (cnt = val = 0;;) {
ch = (u_char)*++s->str;
if (!isdigit(ch) || ch > '7')
break;
val = val * 8 + ch - '0';
if (++cnt == 3) {
++s->str;
break;
}
}
if (cnt) {
if (is_octal != NULL)
*is_octal = 1;
return (val);
}
if (ch != '\0')
++s->str;
switch (ch) {
case 'a': /* escape characters */
return ('\7');
case 'b':
return ('\b');
case 'f':
return ('\f');
case 'n':
return ('\n');
case 'r':
return ('\r');
case 't':
return ('\t');
case 'v':
return ('\13');
case '\0': /* \" -> \ */
s->state = EOS;
return ('\\');
default: /* \x" -> x */
return (ch);
}
}