1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/* Common code for file-based database parsers in nss_files module.
Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
/* These symbols are defined by the including source file:
ENTNAME -- database name of the structure and functions (hostent, pwent).
STRUCTURE -- struct name, define only if not ENTNAME (passwd, group).
DATABASE -- string of the database file's name ("hosts", "passwd").
ENTDATA -- if defined, `struct ENTDATA' is used by the parser to store
things pointed to by the resultant `struct STRUCTURE'.
NEED_H_ERRNO - defined iff an arg `int *herrnop' is used.
Also see files-XXX.c. */
#define CONCAT(a,b) CONCAT1(a,b)
#define CONCAT1(a,b) a##b
#ifndef STRUCTURE
#define STRUCTURE ENTNAME
#endif
struct parser_data
{
#ifdef ENTDATA
struct ENTDATA entdata;
#define ENTDATA_DECL(data) struct ENTDATA *const entdata = &data->entdata;
#else
#define ENTDATA_DECL(data)
#endif
char linebuffer[0];
};
#ifdef ENTDATA
/* The function can't be exported, because the entdata structure
is defined only in files-foo.c. */
#define parser_stclass static inline
#else
/* Export the line parser function so it can be used in nss_db. */
#define parser_stclass /* Global */
#define parse_line CONCAT(_nss_files_parse_,ENTNAME)
#endif
#ifdef EXTERN_PARSER
/* The parser is defined in a different module. */
extern int parse_line (char *line, struct STRUCTURE *result,
struct parser_data *data, int datalen);
#define LINE_PARSER(EOLSET, BODY) /* Do nothing */
#else
/* Define a line parsing function. */
#define LINE_PARSER(EOLSET, BODY) \
parser_stclass int \
parse_line (char *line, struct STRUCTURE *result, \
struct parser_data *data, int datalen) \
{ \
ENTDATA_DECL (data) \
char *p = strpbrk (line, EOLSET "\n"); \
if (p) \
*p = '\0'; \
BODY; \
TRAILING_LIST_PARSER; \
return 1; \
}
#define STRING_FIELD(variable, terminator_p, swallow) \
{ \
variable = line; \
while (*line != '\0' && !terminator_p (*line)) \
++line; \
if (*line != '\0') \
{ \
*line = '\0'; \
do \
++line; \
while (swallow && terminator_p (*line)); \
} \
}
#define INT_FIELD(variable, terminator_p, swallow, base, convert) \
{ \
char *endp; \
variable = convert (strtol (line, &endp, base)); \
if (endp == line) \
return 0; \
else if (terminator_p (*endp)) \
do \
++endp; \
while (swallow && terminator_p (*endp)); \
else if (*endp != '\0') \
return 0; \
line = endp; \
}
#define ISCOLON(c) ((c) == ':')
#ifndef TRAILING_LIST_MEMBER
#define TRAILING_LIST_PARSER /* Nothing to do. */
#else
#define TRAILING_LIST_PARSER \
{ \
char **list = parse_list (line, data, datalen); \
if (list) \
result->TRAILING_LIST_MEMBER = list; \
else \
return 0; \
}
static inline char **
parse_list (char *line, struct parser_data *data, int datalen)
{
char *eol, **list, **p;
if (line >= data->linebuffer && line < (char *) data + datalen)
/* Find the end of the line buffer, we will use the space in DATA after
it for storing the vector of pointers. */
eol = strchr (line, '\0') + 1;
else
/* LINE does not point within DATA->linebuffer, so that space is
not being used for scratch space right now. We can use all of
it for the pointer vector storage. */
eol = data->linebuffer;
/* Adjust the pointer so it is aligned for storing pointers. */
eol += __alignof__ (char *) - 1;
eol -= (eol - (char *) 0) % __alignof__ (char *);
/* We will start the storage here for the vector of pointers. */
list = (char **) eol;
p = list;
while (1)
{
char *elt;
if ((char *) &p[1] - (char *) data > datalen)
{
/* We cannot fit another pointer in the buffer. */
errno = ERANGE;
return NULL;
}
if (*line == '\0')
break;
elt = line;
while (1)
{
if (TRAILING_LIST_SEPARATOR_P (*line))
{
*p++ = elt;
*line = '\0';
do
++line;
while (TRAILING_LIST_SEPARATOR_P (*line));
elt = line;
}
else if (*line == '\0' || *line == '\n')
{
/* End of the line. */
if (line > elt)
/* Last element. */
*p++ = elt;
*line = '\0';
break;
}
else
++line;
}
}
*p = NULL;
return list;
}
#endif /* EXTERN_PARSER */
#define LOOKUP_NAME(nameelt, aliaselt) \
{ \
char **ap; \
if (! strcmp (name, result->nameelt)) \
break; \
for (ap = result->aliaselt; *ap; ++ap) \
if (! strcmp (name, *ap)) \
break; \
if (*ap) \
break; \
}
#endif
/* This is defined by db-*.c to include "../nss_db/db-XXX.c" instead. */
#ifndef GENERIC
#define GENERIC "files-XXX.c"
#endif
|
