src/regex/regerror.c

/*
 * 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(errcode, preg, errbuf, errbuf_size)
int errcode;			/* 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 (errcode) {
	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 == errcode)
				break;
		if (r->code >= 0)
			msg = r->explain;
		else {			/* unknown; say so */
			sprintf(convbuf, unk, errcode);
			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;
}
Commit	Line	Data
	1	/*
	2	* regerror - error-code expansion
	3	*
	4	* Copyright (c) 1998, 1999 Henry Spencer. All rights reserved.
	5	*
	6	* Development of this software was funded, in part, by Cray Research Inc.,
	7	* UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
	8	* Corporation, none of whom are responsible for the results. The author
	9	* thanks all of them.
	10	*
	11	* Redistribution and use in source and binary forms -- with or without
	12	* modification -- are permitted for any purpose, provided that
	13	* redistributions in source form retain this entire copyright notice and
	14	* indicate the origin and nature of any modifications.
	15	*
	16	* I'd appreciate being given credit for this package in the documentation
	17	* of software which uses it, but that is not a requirement.
	18	*
	19	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
	20	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
	21	* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
	22	* HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	23	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	24	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
	25	* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
	26	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
	27	* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
	28	* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	29	*
	30	*/
	31
	32	#include "regguts.h"
	33
	34	/* unknown-error explanation */
	35	static char unk[] = "* unknown regex error code 0x%x *";
	36
	37	/* struct to map among codes, code names, and explanations */
	38	static struct rerr {
	39	int code;
	40	char *name;
	41	char *explain;
	42	} rerrs[] = {
	43	/* the actual table is built from regex.h */
	44	# include "regerrs.h"
	45	{ -1, "", "oops" }, /* explanation special-cased in code */
	46	};
	47
	48	/*
	49	- regerror - the interface to error numbers
	50	*/
	51	/* ARGSUSED */
	52	size_t /* actual space needed (including NUL) */
	53	regerror(errcode, preg, errbuf, errbuf_size)
	54	int errcode; /* error code, or REG_ATOI or REG_ITOA */
	55	CONST regex_t preg; / associated regex_t (unused at present) */
	56	char errbuf; / result buffer (unless errbuf_size==0) */
	57	size_t errbuf_size; /* available space in errbuf, can be 0 */
	58	{
	59	struct rerr *r;
	60	char *msg;
	61	char convbuf[sizeof(unk)+50]; /* 50 = plenty for int */
	62	size_t len;
	63	int icode;
	64
	65	switch (errcode) {
	66	case REG_ATOI: /* convert name to number */
	67	for (r = rerrs; r->code >= 0; r++)
	68	if (strcmp(r->name, errbuf) == 0)
	69	break;
	70	sprintf(convbuf, "%d", r->code); /* -1 for unknown */
	71	msg = convbuf;
	72	break;
	73	case REG_ITOA: /* convert number to name */
	74	icode = atoi(errbuf); /* not our problem if this fails */
	75	for (r = rerrs; r->code >= 0; r++)
	76	if (r->code == icode)
	77	break;
	78	if (r->code >= 0)
	79	msg = r->name;
	80	else { /* unknown; tell him the number */
	81	sprintf(convbuf, "REG_%u", (unsigned)icode);
	82	msg = convbuf;
	83	}
	84	break;
	85	default: /* a real, normal error code */
	86	for (r = rerrs; r->code >= 0; r++)
	87	if (r->code == errcode)
	88	break;
	89	if (r->code >= 0)
	90	msg = r->explain;
	91	else { /* unknown; say so */
	92	sprintf(convbuf, unk, errcode);
	93	msg = convbuf;
	94	}
	95	break;
	96	}
	97
	98	len = strlen(msg) + 1; /* space needed, including NUL */
	99	if (errbuf_size > 0) {
	100	if (errbuf_size > len)
	101	strcpy(errbuf, msg);
	102	else { /* truncate to fit */
	103	strncpy(errbuf, msg, errbuf_size-1);
	104	errbuf[errbuf_size-1] = '\0';
	105	}
	106	}
	107
	108	return len;
	109	}