regerror.c
上传用户:rrhhcc
上传日期:2015-12-11
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文件大小:3k
- /*
- * 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;
- char *name;
- 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(code, preg, errbuf, errbuf_size)
- 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;
- 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] = ' ';
- }
- }
- return len;
- }