1 /*-
2 * Copyright (c) 1992, 1993, 1994 Henry Spencer.
3 * Copyright (c) 1992, 1993, 1994
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Henry Spencer.
8 *
9 * %sccs.include.redist.c%
10 *
11 * @(#)regerror.c 8.4 (Berkeley) 03/20/94
12 */
13
14 #if defined(LIBC_SCCS) && !defined(lint)
15 static char sccsid[] = "@(#)regerror.c 8.4 (Berkeley) 03/20/94";
16 #endif /* LIBC_SCCS and not lint */
17
18 #include <sys/types.h>
19 #include <stdio.h>
20 #include <string.h>
21 #include <ctype.h>
22 #include <limits.h>
23 #include <stdlib.h>
24 #include <regex.h>
25
26 #include "utils.h"
27
28 /* ========= begin header generated by ./mkh ========= */
29 #ifdef __cplusplus
30 extern "C" {
31 #endif
32
33 /* === regerror.c === */
34 static char *regatoi __P((const regex_t *preg, char *localbuf));
35
36 #ifdef __cplusplus
37 }
38 #endif
39 /* ========= end header generated by ./mkh ========= */
40 /*
41 = #define REG_NOMATCH 1
42 = #define REG_BADPAT 2
43 = #define REG_ECOLLATE 3
44 = #define REG_ECTYPE 4
45 = #define REG_EESCAPE 5
46 = #define REG_ESUBREG 6
47 = #define REG_EBRACK 7
48 = #define REG_EPAREN 8
49 = #define REG_EBRACE 9
50 = #define REG_BADBR 10
51 = #define REG_ERANGE 11
52 = #define REG_ESPACE 12
53 = #define REG_BADRPT 13
54 = #define REG_EMPTY 14
55 = #define REG_ASSERT 15
56 = #define REG_INVARG 16
57 = #define REG_ATOI 255 // convert name to number (!)
58 = #define REG_ITOA 0400 // convert number to name (!)
59 */
60 static struct rerr {
61 int code;
62 char *name;
63 char *explain;
64 } rerrs[] = {
65 REG_NOMATCH, "REG_NOMATCH", "regexec() failed to match",
66 REG_BADPAT, "REG_BADPAT", "invalid regular expression",
67 REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element",
68 REG_ECTYPE, "REG_ECTYPE", "invalid character class",
69 REG_EESCAPE, "REG_EESCAPE", "trailing backslash (\\)",
70 REG_ESUBREG, "REG_ESUBREG", "invalid backreference number",
71 REG_EBRACK, "REG_EBRACK", "brackets ([ ]) not balanced",
72 REG_EPAREN, "REG_EPAREN", "parentheses not balanced",
73 REG_EBRACE, "REG_EBRACE", "braces not balanced",
74 REG_BADBR, "REG_BADBR", "invalid repetition count(s)",
75 REG_ERANGE, "REG_ERANGE", "invalid character range",
76 REG_ESPACE, "REG_ESPACE", "out of memory",
77 REG_BADRPT, "REG_BADRPT", "repetition-operator operand invalid",
78 REG_EMPTY, "REG_EMPTY", "empty (sub)expression",
79 REG_ASSERT, "REG_ASSERT", "\"can't happen\" -- you found a bug",
80 REG_INVARG, "REG_INVARG", "invalid argument to regex routine",
81 0, "", "*** unknown regexp error code ***",
82 };
83
84 /*
85 - regerror - the interface to error numbers
86 = extern size_t regerror(int, const regex_t *, char *, size_t);
87 */
88 /* ARGSUSED */
89 size_t
regerror(errcode,preg,errbuf,errbuf_size)90 regerror(errcode, preg, errbuf, errbuf_size)
91 int errcode;
92 const regex_t *preg;
93 char *errbuf;
94 size_t errbuf_size;
95 {
96 register struct rerr *r;
97 register size_t len;
98 register int target = errcode &~ REG_ITOA;
99 register char *s;
100 char convbuf[50];
101
102 if (errcode == REG_ATOI)
103 s = regatoi(preg, convbuf);
104 else {
105 for (r = rerrs; r->code != 0; r++)
106 if (r->code == target)
107 break;
108
109 if (errcode®_ITOA) {
110 if (r->code != 0)
111 (void) strcpy(convbuf, r->name);
112 else
113 sprintf(convbuf, "REG_0x%x", target);
114 assert(strlen(convbuf) < sizeof(convbuf));
115 s = convbuf;
116 } else
117 s = r->explain;
118 }
119
120 len = strlen(s) + 1;
121 if (errbuf_size > 0) {
122 if (errbuf_size > len)
123 (void) strcpy(errbuf, s);
124 else {
125 (void) strncpy(errbuf, s, errbuf_size-1);
126 errbuf[errbuf_size-1] = '\0';
127 }
128 }
129
130 return(len);
131 }
132
133 /*
134 - regatoi - internal routine to implement REG_ATOI
135 == static char *regatoi(const regex_t *preg, char *localbuf);
136 */
137 static char *
regatoi(preg,localbuf)138 regatoi(preg, localbuf)
139 const regex_t *preg;
140 char *localbuf;
141 {
142 register struct rerr *r;
143 register size_t siz;
144 register char *p;
145
146 for (r = rerrs; r->code != 0; r++)
147 if (strcmp(r->name, preg->re_endp) == 0)
148 break;
149 if (r->code == 0)
150 return("0");
151
152 sprintf(localbuf, "%d", r->code);
153 return(localbuf);
154 }
155