The R Project SVN R

/*-
 * Copyright (c) 1992, 1993, 1994 Henry Spencer.
 * Copyright (c) 1992, 1993, 1994
 *  The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Henry Spencer.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by the University of
 *  California, Berkeley and its contributors.
 * 4. 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.
 *
 *  @(#)regerror.c  8.4 (Berkeley) 3/20/94
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)regerror.c  8.4 (Berkeley) 3/20/94";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stdlib.h>
#include <regex.h>

#include "utils.h"

/* ========= begin header generated by ./mkh ========= */
#ifdef __cplusplus
extern "C" {
#endif

/* === regerror.c === */
static char *regatoi __P((const regex_t *preg, char *localbuf));

#ifdef __cplusplus
}
#endif
/* ========= end header generated by ./mkh ========= */
/*
 = #define  REG_NOMATCH  1
 = #define  REG_BADPAT   2
 = #define  REG_ECOLLATE     3
 = #define  REG_ECTYPE   4
 = #define  REG_EESCAPE  5
 = #define  REG_ESUBREG  6
 = #define  REG_EBRACK   7
 = #define  REG_EPAREN   8
 = #define  REG_EBRACE   9
 = #define  REG_BADBR   10
 = #define  REG_ERANGE  11
 = #define  REG_ESPACE  12
 = #define  REG_BADRPT  13
 = #define  REG_EMPTY   14
 = #define  REG_ASSERT  15
 = #define  REG_INVARG  16
 = #define  REG_ATOI    255 // convert name to number (!)
 = #define  REG_ITOA    0400    // convert number to name (!)
 */
static struct rerr {
    int code;
    char *name;
    char *explain;
} rerrs[] = {
    {REG_NOMATCH,   "REG_NOMATCH",  "regexec() failed to match"},
    {REG_BADPAT,    "REG_BADPAT",   "invalid regular expression"},
    {REG_ECOLLATE,  "REG_ECOLLATE", "invalid collating element"},
    {REG_ECTYPE,    "REG_ECTYPE",   "invalid character class"},
    {REG_EESCAPE,   "REG_EESCAPE",  "trailing backslash (\\)"},
    {REG_ESUBREG,   "REG_ESUBREG",  "invalid backreference number"},
    {REG_EBRACK,    "REG_EBRACK",   "brackets ([ ]) not balanced"},
    {REG_EPAREN,    "REG_EPAREN",   "parentheses not balanced"},
    {REG_EBRACE,    "REG_EBRACE",   "braces not balanced"},
    {REG_BADBR, "REG_BADBR",    "invalid repetition count(s)"},
    {REG_ERANGE,    "REG_ERANGE",   "invalid character range"},
    {REG_ESPACE,    "REG_ESPACE",   "out of memory"},
    {REG_BADRPT,    "REG_BADRPT",   "repetition-operator operand invalid"},
    {REG_EMPTY, "REG_EMPTY",    "empty (sub)expression"},
    {REG_ASSERT,    "REG_ASSERT",   "\"can't happen\" -- you found a bug"},
    {REG_INVARG,    "REG_INVARG",   "invalid argument to regex routine"},
    {0,     "",     "*** unknown regexp error code ***"}
};

/*
 - regerror - the interface to error numbers
 = extern size_t regerror(int, const regex_t *, char *, size_t);
 */
/* ARGSUSED */
size_t
regerror(errcode, preg, errbuf, errbuf_size)
int errcode;
const regex_t *preg;
char *errbuf;
size_t errbuf_size;
{
    register struct rerr *r;
    register size_t len;
    register int target = errcode &~ REG_ITOA;
    register char *s;
    char convbuf[50];

    if (errcode == REG_ATOI)
        s = regatoi(preg, convbuf);
    else {
        for (r = rerrs; r->code != 0; r++)
            if (r->code == target)
                break;

        if (errcode&REG_ITOA) {
            if (r->code != 0)
                (void) strcpy(convbuf, r->name);
            else
                sprintf(convbuf, "REG_0x%x", target);
            assert(strlen(convbuf) < sizeof(convbuf));
            s = convbuf;
        } else
            s = r->explain;
    }

    len = strlen(s) + 1;
    if (errbuf_size > 0) {
        if (errbuf_size > len)
            (void) strcpy(errbuf, s);
        else {
            (void) strncpy(errbuf, s, errbuf_size-1);
            errbuf[errbuf_size-1] = '\0';
        }
    }

    return(len);
}

/*
 - regatoi - internal routine to implement REG_ATOI
 == static char *regatoi(const regex_t *preg, char *localbuf);
 */
static char *
regatoi(preg, localbuf)
const regex_t *preg;
char *localbuf;
{
    register struct rerr *r;

    for (r = rerrs; r->code != 0; r++)
        if (strcmp(r->name, preg->re_endp) == 0)
            break;
    if (r->code == 0)
        return("0");

    sprintf(localbuf, "%d", r->code);
    return(localbuf);
}