b3608ae18f
The index() and rindex() functions were marked LEGACY in the 2001 revision of POSIX and were subsequently removed from the 2008 revision. The strchr() and strrchr() functions are part of the C standard. This makes the source code a lot more consistent, as most of these C files also call into other str*() routines. In fact, about a dozen already perform strchr() calls.
388 lines
8.6 KiB
C
388 lines
8.6 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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* 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char sccsid[] = "@(#)str.c 8.2 (Berkeley) 4/28/95";
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#endif
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#include <sys/types.h>
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#include <ctype.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 <wchar.h>
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#include <wctype.h>
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#include "extern.h"
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static int backslash(STR *, int *);
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static int bracket(STR *);
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static void genclass(STR *);
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static void genequiv(STR *);
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static int genrange(STR *, int);
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static void genseq(STR *);
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wint_t
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next(STR *s)
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{
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int is_octal;
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wint_t ch;
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wchar_t wch;
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size_t clen;
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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 (*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, &is_octal);
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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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clen = mbrtowc(&wch, s->str, MB_LEN_MAX, NULL);
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if (clen == (size_t)-1 || clen == (size_t)-2 ||
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clen == 0)
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errc(1, EILSEQ, NULL);
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is_octal = 0;
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s->lastch = wch;
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s->str += clen;
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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, is_octal))
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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 CCLASS:
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case CCLASS_UPPER:
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case CCLASS_LOWER:
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s->cnt++;
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ch = nextwctype(s->lastch, s->cclass);
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if (ch == -1) {
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s->state = NORMAL;
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return (next(s));
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}
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s->lastch = ch;
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return (1);
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case SET:
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if ((ch = 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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s->lastch = ch;
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return (1);
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default:
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return (0);
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}
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/* NOTREACHED */
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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 = strchr(s->str + 2, ']')) == NULL)
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return (0);
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if (*(p - 1) != ':' || p - s->str < 4)
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goto repeat;
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*(p - 1) = '\0';
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s->str += 2;
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genclass(s);
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s->str = p + 1;
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return (1);
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case '=': /* "[=equiv=]" */
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if (s->str[2] == '\0' || (p = strchr(s->str + 3, ']')) == NULL)
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return (0);
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if (*(p - 1) != '=' || p - s->str < 4)
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goto repeat;
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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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repeat:
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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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static void
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genclass(STR *s)
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{
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if ((s->cclass = wctype(s->str)) == 0)
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errx(1, "unknown class %s", s->str);
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s->cnt = 0;
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s->lastch = -1; /* incremented before check in next() */
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if (strcmp(s->str, "upper") == 0)
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s->state = CCLASS_UPPER;
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else if (strcmp(s->str, "lower") == 0)
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s->state = CCLASS_LOWER;
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else
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s->state = CCLASS;
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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 i, p, pri;
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char src[2], dst[3];
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size_t clen;
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wchar_t wc;
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if (*s->str == '\\') {
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s->equiv[0] = backslash(s, NULL);
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if (*s->str != '=')
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errx(1, "misplaced equivalence equals sign");
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s->str += 2;
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} else {
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clen = mbrtowc(&wc, s->str, MB_LEN_MAX, NULL);
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if (clen == (size_t)-1 || clen == (size_t)-2 || clen == 0)
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errc(1, EILSEQ, NULL);
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s->equiv[0] = wc;
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if (s->str[clen] != '=')
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errx(1, "misplaced equivalence equals sign");
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s->str += clen + 2;
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}
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/*
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* Calculate the set of all characters in the same equivalence class
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* as the specified character (they will have the same primary
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* collation weights).
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* XXX Knows too much about how strxfrm() is implemented. Assumes
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* it fills the string with primary collation weight bytes. Only one-
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* to-one mappings are supported.
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* XXX Equivalence classes not supported in multibyte locales.
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*/
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src[0] = (char)s->equiv[0];
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src[1] = '\0';
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if (MB_CUR_MAX == 1 && strxfrm(dst, src, sizeof(dst)) == 1) {
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pri = (unsigned char)*dst;
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for (p = 1, i = 1; i < NCHARS_SB; i++) {
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*src = i;
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if (strxfrm(dst, src, sizeof(dst)) == 1 && pri &&
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pri == (unsigned char)*dst)
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s->equiv[p++] = i;
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}
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s->equiv[p] = OOBCH;
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}
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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, int was_octal)
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{
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int stopval, octal;
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char *savestart;
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int n, cnt, *p;
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size_t clen;
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wchar_t wc;
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octal = 0;
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savestart = s->str;
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if (*++s->str == '\\')
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stopval = backslash(s, &octal);
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else {
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clen = mbrtowc(&wc, s->str, MB_LEN_MAX, NULL);
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if (clen == (size_t)-1 || clen == (size_t)-2)
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errc(1, EILSEQ, NULL);
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stopval = wc;
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s->str += clen;
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}
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/*
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* XXX Characters are not ordered according to collating sequence in
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* multibyte locales.
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*/
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if (octal || was_octal || MB_CUR_MAX > 1) {
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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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if (charcoll((const void *)&stopval, (const void *)&(s->lastch)) < 0) {
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s->str = savestart;
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return (0);
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}
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if ((s->set = p = malloc((NCHARS_SB + 1) * sizeof(int))) == NULL)
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err(1, "genrange() malloc");
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for (cnt = 0; cnt < NCHARS_SB; cnt++)
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if (charcoll((const void *)&cnt, (const void *)&(s->lastch)) >= 0 &&
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charcoll((const void *)&cnt, (const void *)&stopval) <= 0)
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*p++ = cnt;
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*p = OOBCH;
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n = p - s->set;
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s->cnt = 0;
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s->state = SET;
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if (n > 1)
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mergesort(s->set, n, sizeof(*(s->set)), charcoll);
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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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wchar_t wc;
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size_t clen;
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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, NULL);
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else {
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clen = mbrtowc(&wc, s->str, MB_LEN_MAX, NULL);
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if (clen == (size_t)-1 || clen == (size_t)-2)
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errc(1, EILSEQ, NULL);
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s->lastch = wc;
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s->str += clen;
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}
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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, NULL);
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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((u_char)*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, int *is_octal)
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{
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int ch, cnt, val;
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if (is_octal != NULL)
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*is_octal = 0;
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for (cnt = val = 0;;) {
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ch = (u_char)*++s->str;
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if (!isdigit(ch) || ch > '7')
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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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if (is_octal != NULL)
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*is_octal = 1;
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return (val);
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}
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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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