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//
// engine.c
//
// Error codes for regular expression library
//
// Ported to sanos by Michael Ringgaard.
//
// Copyright 1992, 1993, 1994, 1997 Henry Spencer. All rights reserved.
// This software is not subject to any license of the American Telephone
// and Telegraph Company or of the Regents of the University of California.
//
// Permission is granted to anyone to use this software for any purpose on
// any computer system, and to alter it and redistribute it, subject
// to the following restrictions:
//
// 1. The author is not responsible for the consequences of use of this
// software, no matter how awful, even if they arise from flaws in it.
//
// 2. The origin of this software must not be misrepresented, either by
// explicit claim or by omission. Since few users ever read sources,
// credits must appear in the documentation.
//
// 3. Altered versions must be plainly marked as such, and must not be
// misrepresented as being the original software. Since few users
// ever read sources, credits must appear in the documentation.
//
// 4. This notice may not be removed or altered.
//
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stdlib.h>
#include <regex.h>
#include "regex2.h"
static struct rerr {
int code;
char *name;
char *explain;
} rerrs[] = {
{REG_OKAY, "REG_OKAY", "no errors detected"},
{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"},
{-1, "", "*** unknown regexp error code ***"},
};
static char *regatoi(const regex_t *preg, char *localbuf);
//
// regerror - the interface to error numbers
//
size_t regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size) {
struct rerr *r;
size_t len;
int target = errcode & ~REG_ITOA;
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) {
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) {
strcpy(errbuf, s);
} else {
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) {
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;
}