source: downloads/tcl8.5.2/generic/regerror.c @ 42

/*
 * regerror - error-code expansion
 *
 * Copyright (c) 1998, 1999 Henry Spencer.  All rights reserved.
 *
 * Development of this software was funded, in part, by Cray Research Inc.,
 * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
 * Corporation, none of whom are responsible for the results.  The author
 * thanks all of them.
 *
 * Redistribution and use in source and binary forms -- with or without
 * modification -- are permitted for any purpose, provided that
 * redistributions in source form retain this entire copyright notice and
 * indicate the origin and nature of any modifications.
 *
 * I'd appreciate being given credit for this package in the documentation of
 * software which uses it, but that is not a requirement.
 *
 * THIS SOFTWARE IS PROVIDED ``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
 * HENRY SPENCER 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 "regguts.h"

/*
 * Unknown-error explanation.
 */

static char unk[] = "*** unknown regex error code 0x%x ***";

/*
 * Struct to map among codes, code names, and explanations.
 */

static struct rerr {
    int code;
    const char *name;
    const char *explain;
} rerrs[] = {
    /* The actual table is built from regex.h */
#include "regerrs.h"
    { -1, "", "oops" },         /* explanation special-cased in code */
};

/*
 - regerror - the interface to error numbers
 */
/* ARGSUSED */
size_t                          /* Actual space needed (including NUL) */
regerror(
    int code,                   /* Error code, or REG_ATOI or REG_ITOA */
    const regex_t *preg,        /* Associated regex_t (unused at present) */
    char *errbuf,               /* Result buffer (unless errbuf_size==0) */
    size_t errbuf_size)         /* Available space in errbuf, can be 0 */
{
    struct rerr *r;
    const char *msg;
    char convbuf[sizeof(unk)+50]; /* 50 = plenty for int */
    size_t len;
    int icode;

    switch (code) {
    case REG_ATOI:              /* Convert name to number */
        for (r = rerrs; r->code >= 0; r++) {
            if (strcmp(r->name, errbuf) == 0) {
                break;
            }
        }
        sprintf(convbuf, "%d", r->code); /* -1 for unknown */
        msg = convbuf;
        break;
    case REG_ITOA:              /* Convert number to name */
        icode = atoi(errbuf);   /* Not our problem if this fails */
        for (r = rerrs; r->code >= 0; r++) {
            if (r->code == icode) {
                break;
            }
        }
        if (r->code >= 0) {
            msg = r->name;
        } else {                /* Unknown; tell him the number */
            sprintf(convbuf, "REG_%u", (unsigned)icode);
            msg = convbuf;
        }
        break;
    default:                    /* A real, normal error code */
        for (r = rerrs; r->code >= 0; r++) {
            if (r->code == code) {
                break;
            }
        }
        if (r->code >= 0) {
            msg = r->explain;
        } else {                /* Unknown; say so */
            sprintf(convbuf, unk, code);
            msg = convbuf;
        }
        break;
    }

    len = strlen(msg) + 1;      /* Space needed, including NUL */
    if (errbuf_size > 0) {
        if (errbuf_size > len) {
            strcpy(errbuf, msg);
        } else {                /* Truncate to fit */
            strncpy(errbuf, msg, errbuf_size-1);
            errbuf[errbuf_size-1] = '\0';
        }
    }

    return len;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */