1#include <sys/types.h>
2#include <stdio.h>
3#include <string.h>
4#include <ctype.h>
5#include <limits.h>
6#include <stdlib.h>
7#include <regex.h>
8
9#include "utils.h"
10#include "regerror.ih"
11
12/*
13 = #define	REG_OKAY	 0
14 = #define	REG_NOMATCH	 1
15 = #define	REG_BADPAT	 2
16 = #define	REG_ECOLLATE	 3
17 = #define	REG_ECTYPE	 4
18 = #define	REG_EESCAPE	 5
19 = #define	REG_ESUBREG	 6
20 = #define	REG_EBRACK	 7
21 = #define	REG_EPAREN	 8
22 = #define	REG_EBRACE	 9
23 = #define	REG_BADBR	10
24 = #define	REG_ERANGE	11
25 = #define	REG_ESPACE	12
26 = #define	REG_BADRPT	13
27 = #define	REG_EMPTY	14
28 = #define	REG_ASSERT	15
29 = #define	REG_INVARG	16
30 = #define	REG_ATOI	255	// convert name to number (!)
31 = #define	REG_ITOA	0400	// convert number to name (!)
32 */
33static struct rerr {
34	int code;
35	char *name;
36	char *explain;
37} rerrs[] = {
38	REG_OKAY,	"REG_OKAY",	"no errors detected",
39	REG_NOMATCH,	"REG_NOMATCH",	"regexec() failed to match",
40	REG_BADPAT,	"REG_BADPAT",	"invalid regular expression",
41	REG_ECOLLATE,	"REG_ECOLLATE",	"invalid collating element",
42	REG_ECTYPE,	"REG_ECTYPE",	"invalid character class",
43	REG_EESCAPE,	"REG_EESCAPE",	"trailing backslash (\\)",
44	REG_ESUBREG,	"REG_ESUBREG",	"invalid backreference number",
45	REG_EBRACK,	"REG_EBRACK",	"brackets ([ ]) not balanced",
46	REG_EPAREN,	"REG_EPAREN",	"parentheses not balanced",
47	REG_EBRACE,	"REG_EBRACE",	"braces not balanced",
48	REG_BADBR,	"REG_BADBR",	"invalid repetition count(s)",
49	REG_ERANGE,	"REG_ERANGE",	"invalid character range",
50	REG_ESPACE,	"REG_ESPACE",	"out of memory",
51	REG_BADRPT,	"REG_BADRPT",	"repetition-operator operand invalid",
52	REG_EMPTY,	"REG_EMPTY",	"empty (sub)expression",
53	REG_ASSERT,	"REG_ASSERT",	"\"can't happen\" -- you found a bug",
54	REG_INVARG,	"REG_INVARG",	"invalid argument to regex routine",
55	-1,		"",		"*** unknown regexp error code ***",
56};
57
58/*
59 - regerror - the interface to error numbers
60 = extern size_t regerror(int, const regex_t *, char *, size_t);
61 */
62/* ARGSUSED */
63size_t
64regerror(
65int errcode,
66const regex_t *preg,
67char *errbuf,
68size_t errbuf_size)
69{
70	register struct rerr *r;
71	register size_t len;
72	register int target = errcode &~ REG_ITOA;
73	register char *s;
74	char convbuf[50];
75
76	if (errcode == REG_ATOI)
77		s = regatoi(preg, convbuf);
78	else {
79		for (r = rerrs; r->code >= 0; r++)
80			if (r->code == target)
81				break;
82
83		if (errcode&REG_ITOA) {
84			if (r->code >= 0)
85				(void) strcpy(convbuf, r->name);
86			else
87				sprintf(convbuf, "REG_0x%x", target);
88			assert(strlen(convbuf) < sizeof(convbuf));
89			s = convbuf;
90		} else
91			s = r->explain;
92	}
93
94	len = strlen(s) + 1;
95	if (errbuf_size > 0) {
96		if (errbuf_size > len)
97			(void) strcpy(errbuf, s);
98		else {
99			(void) strncpy(errbuf, s, errbuf_size-1);
100			errbuf[errbuf_size-1] = '\0';
101		}
102	}
103
104	return(len);
105}
106
107/*
108 - regatoi - internal routine to implement REG_ATOI
109 == static char *regatoi(const regex_t *preg, char *localbuf);
110 */
111static char *
112regatoi(preg, localbuf)
113const regex_t *preg;
114char *localbuf;
115{
116	register struct rerr *r;
117
118	for (r = rerrs; r->code >= 0; r++)
119		if (strcmp(r->name, preg->re_endp) == 0)
120			break;
121	if (r->code < 0)
122		return("0");
123
124	sprintf(localbuf, "%d", r->code);
125	return(localbuf);
126}
127