xref: /PHP-5.3/ext/ereg/regex/regerror.c (revision 9fb62f33)
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 
8 #include "regex.h"
9 #include "utils.h"
10 #include "regerror.ih"
11 #include "php.h"
12 
13 /*
14  = #define	REG_OKAY	 0
15  = #define	REG_NOMATCH	 1
16  = #define	REG_BADPAT	 2
17  = #define	REG_ECOLLATE	 3
18  = #define	REG_ECTYPE	 4
19  = #define	REG_EESCAPE	 5
20  = #define	REG_ESUBREG	 6
21  = #define	REG_EBRACK	 7
22  = #define	REG_EPAREN	 8
23  = #define	REG_EBRACE	 9
24  = #define	REG_BADBR	10
25  = #define	REG_ERANGE	11
26  = #define	REG_ESPACE	12
27  = #define	REG_BADRPT	13
28  = #define	REG_EMPTY	14
29  = #define	REG_ASSERT	15
30  = #define	REG_INVARG	16
31  = #define	REG_ATOI	255	// convert name to number (!)
32  = #define	REG_ITOA	0400	// convert number to name (!)
33  */
34 static const struct rerr {
35 	int code;
36 	const char *name;
37 	const char *explain;
38 } rerrs[] = {
39 	{REG_OKAY,	"REG_OKAY",	"no errors detected"},
40 	{REG_NOMATCH,	"REG_NOMATCH",	"regexec() failed to match"},
41 	{REG_BADPAT,	"REG_BADPAT",	"invalid regular expression"},
42 	{REG_ECOLLATE,	"REG_ECOLLATE",	"invalid collating element"},
43 	{REG_ECTYPE,	"REG_ECTYPE",	"invalid character class"},
44 	{REG_EESCAPE,	"REG_EESCAPE",	"trailing backslash (\\)"},
45 	{REG_ESUBREG,	"REG_ESUBREG",	"invalid backreference number"},
46 	{REG_EBRACK,	"REG_EBRACK",	"brackets ([ ]) not balanced"},
47 	{REG_EPAREN,	"REG_EPAREN",	"parentheses not balanced"},
48 	{REG_EBRACE,	"REG_EBRACE",	"braces not balanced"},
49 	{REG_BADBR,	"REG_BADBR",	"invalid repetition count(s)"},
50 	{REG_ERANGE,	"REG_ERANGE",	"invalid character range"},
51 	{REG_ESPACE,	"REG_ESPACE",	"out of memory"},
52 	{REG_BADRPT,	"REG_BADRPT",	"repetition-operator operand invalid"},
53 	{REG_EMPTY,	"REG_EMPTY",	"empty (sub)expression"},
54 	{REG_ASSERT,	"REG_ASSERT",	"\"can't happen\" -- you found a bug"},
55 	{REG_INVARG,	"REG_INVARG",	"invalid argument to regex routine"},
56 	{-1,		"",		"*** unknown regexp error code ***"},
57 };
58 
59 /*
60  - regerror - the interface to error numbers
61  = API_EXPORT(size_t) regerror(int, const regex_t *, char *, size_t);
62  */
63 /* ARGSUSED */
64 API_EXPORT(size_t)
regerror(int errcode,const regex_t * preg,char * errbuf,size_t errbuf_size)65 regerror(
66 int errcode,
67 const regex_t *preg,
68 char *errbuf,
69 size_t errbuf_size)
70 {
71 	register const struct rerr *r;
72 	register size_t len;
73 	register int target = errcode &~ REG_ITOA;
74 	register const char *s;
75 	char convbuf[50];
76 
77 	if (errcode == REG_ATOI)
78 		s = regatoi(preg, convbuf, sizeof(convbuf));
79 	else {
80 		for (r = rerrs; r->code >= 0; r++)
81 			if (r->code == target)
82 				break;
83 
84 		if (errcode&REG_ITOA) {
85 			if (r->code >= 0) {
86 				(void) strncpy(convbuf, r->name, sizeof(convbuf) - 1);
87 				convbuf[sizeof(convbuf) - 1] = '\0';
88 			} else {
89 				snprintf(convbuf, sizeof(convbuf), "REG_0x%x", target);
90 			}
91 			assert(strlen(convbuf) < sizeof(convbuf));
92 			s = convbuf;
93 		} else
94 			s = r->explain;
95 	}
96 
97 	len = strlen(s) + 1;
98 	if (errbuf_size > 0) {
99 		if (errbuf_size > len)
100 			(void) strcpy(errbuf, s);
101 		else {
102 			(void) strncpy(errbuf, s, errbuf_size-1);
103 			errbuf[errbuf_size-1] = '\0';
104 		}
105 	}
106 
107 	return(len);
108 }
109 
110 /*
111  - regatoi - internal routine to implement REG_ATOI
112  == static char *regatoi(const regex_t *preg, char *localbuf, int bufsize);
113  */
114 static char *
regatoi(preg,localbuf,bufsize)115 regatoi(preg, localbuf, bufsize)
116 const regex_t *preg;
117 char *localbuf;
118 int bufsize;
119 {
120 	register const struct rerr *r;
121 
122 	for (r = rerrs; r->code >= 0; r++)
123 		if (strcmp(r->name, preg->re_endp) == 0)
124 			break;
125 	if (r->code < 0)
126 		return("0");
127 
128 	snprintf(localbuf, bufsize, "%d", r->code);
129 	return(localbuf);
130 }
131