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srohatgi01
GitHub Repository: srohatgi01/cups
 Path: blob/master/vcnet/regex/regerror.c
1090 views
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#include <stddef.h>

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#include <stdio.h>

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#include <string.h>

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#include "regex.h"

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static struct rerr {

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	int code;

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	char *name;

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	char *explain;

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} rerrs[] = {

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	{REG_OKAY,	"REG_OKAY",	"no errors detected"},

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	{REG_NOMATCH,	"REG_NOMATCH",	"regexec() failed to match"},

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	{REG_BADPAT,	"REG_BADPAT",	"invalid regular expression"},

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	{REG_ECOLLATE,	"REG_ECOLLATE",	"invalid collating element"},

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	{REG_ECTYPE,	"REG_ECTYPE",	"invalid character class"},

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	{REG_EESCAPE,	"REG_EESCAPE",	"trailing backslash (\\)"},

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	{REG_ESUBREG,	"REG_ESUBREG",	"invalid backreference number"},

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	{REG_EBRACK,	"REG_EBRACK",	"brackets ([ ]) not balanced"},

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	{REG_EPAREN,	"REG_EPAREN",	"parentheses not balanced"},

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	{REG_EBRACE,	"REG_EBRACE",	"braces not balanced"},

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	{REG_BADBR,	"REG_BADBR",	"invalid repetition count(s)"},

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	{REG_ERANGE,	"REG_ERANGE",	"invalid character range"},

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	{REG_ESPACE,	"REG_ESPACE",	"out of memory"},

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	{REG_BADRPT,	"REG_BADRPT",	"repetition-operator operand invalid"},

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	{REG_EMPTY,	"REG_EMPTY",	"empty (sub)expression"},

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	{REG_ASSERT,	"REG_ASSERT",	"\"can't happen\" -- you found a bug"},

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	{REG_INVARG,	"REG_INVARG",	"invalid argument to regex routine"},

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	{-1,		"",		"*** unknown regexp error code ***"},

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};

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static size_t

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set_result(char *errbuf, size_t errbuf_size, char *result) {

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	size_t result_len = strlen(result);

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	if (errbuf_size > 0) {

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		size_t copy_len = result_len < errbuf_size ? result_len : errbuf_size - 1;

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		memcpy(errbuf, result, copy_len);

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		errbuf[copy_len] = 0;

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	}

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	return result_len + 1;

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}

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/*

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 - regerror - the interface to error numbers

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 */

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size_t

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regerror(int errorcode, const regex_t *preg, char *errbuf, size_t errbuf_size)

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{

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	struct rerr *r;

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	char convbuf[50];

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	if (errorcode == REG_ATOI) {

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		if (preg == NULL || preg->re_endp == NULL)

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			return set_result(errbuf, errbuf_size, "0");

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		for (r = rerrs; r->code >= 0; r++)

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			if (strcmp(r->name, preg->re_endp) == 0)

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				break;

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		if (r->code < 0)

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			return set_result(errbuf, errbuf_size, "0");

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		snprintf(convbuf, sizeof convbuf, "%d", r->code);

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		return set_result(errbuf, errbuf_size, convbuf);

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	}

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	else {

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		int target = errorcode &~ REG_ITOA;

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		for (r = rerrs; r->code >= 0; r++)

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			if (r->code == target)

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				break;

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		if (errorcode & REG_ITOA) {

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			if (r->code >= 0)

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				return set_result(errbuf, errbuf_size, r->name);

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			snprintf(convbuf, sizeof convbuf, "REG_0x%x", target);

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			return set_result(errbuf, errbuf_size, convbuf);

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		}

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		return set_result(errbuf, errbuf_size, r->explain);

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	}

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}

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