1 /* Common code for file-based database parsers in nss_files module.
2 Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
25 /* These symbols are defined by the including source file:
27 ENTNAME -- database name of the structure and functions (hostent, pwent).
28 STRUCTURE -- struct name, define only if not ENTNAME (passwd, group).
29 DATABASE -- string of the database file's name ("hosts", "passwd").
31 ENTDATA -- if defined, `struct ENTDATA' is used by the parser to store
32 things pointed to by the resultant `struct STRUCTURE'.
34 NEED_H_ERRNO - defined iff an arg `int *herrnop' is used.
36 Also see files-XXX.c. */
38 #define CONCAT(a,b) CONCAT1(a,b)
39 #define CONCAT1(a,b) a##b
42 # define STRUCTURE ENTNAME
49 struct ENTDATA entdata
;
50 # define ENTDATA_DECL(data) struct ENTDATA *const entdata = &data->entdata;
52 # define ENTDATA_DECL(data)
58 /* The function can't be exported, because the entdata structure
59 is defined only in files-foo.c. */
60 # define parser_stclass static
62 /* Export the line parser function so it can be used in nss_db. */
63 # define parser_stclass /* Global */
64 # define parse_line CONCAT(_nss_files_parse_,ENTNAME)
70 /* The parser is defined in a different module. */
71 extern int parse_line (char *line
, struct STRUCTURE
*result
,
72 struct parser_data
*data
, size_t datalen
);
74 # define LINE_PARSER(EOLSET, BODY) /* Do nothing */
78 /* Define a line parsing function. */
80 # define LINE_PARSER(EOLSET, BODY) \
82 parse_line (char *line, struct STRUCTURE *result, \
83 struct parser_data *data, size_t datalen) \
86 char *p = strpbrk (line, EOLSET "\n"); \
90 TRAILING_LIST_PARSER; \
95 # define STRING_FIELD(variable, terminator_p, swallow) \
98 while (*line != '\0' && !terminator_p (*line)) \
105 while (swallow && terminator_p (*line)); \
109 # define INT_FIELD(variable, terminator_p, swallow, base, convert) \
112 variable = convert (strtoul (line, &endp, base)); \
115 else if (terminator_p (*endp)) \
118 while (swallow && terminator_p (*endp)); \
119 else if (*endp != '\0') \
124 # define INT_FIELD_MAYBE_NULL(variable, terminator_p, swallow, base, convert, default) \
128 /* We expect some more input, so don't allow the string to end here. */ \
130 variable = convert (strtoul (line, &endp, base)); \
132 variable = default; \
133 if (terminator_p (*endp)) \
136 while (swallow && terminator_p (*endp)); \
137 else if (*endp != '\0') \
142 # define ISCOLON(c) ((c) == ':')
145 # ifndef TRAILING_LIST_MEMBER
146 # define TRAILING_LIST_PARSER /* Nothing to do. */
149 # define TRAILING_LIST_PARSER \
151 char **list = parse_list (line, data, datalen); \
153 result->TRAILING_LIST_MEMBER = list; \
155 return -1; /* -1 indicates we ran out of space. */ \
158 static inline char **
159 __attribute ((always_inline
))
160 parse_list (char *line
, struct parser_data
*data
, size_t datalen
)
162 char *eol
, **list
, **p
;
164 if (line
>= data
->linebuffer
&& line
< (char *) data
+ datalen
)
165 /* Find the end of the line buffer, we will use the space in DATA after
166 it for storing the vector of pointers. */
167 eol
= strchr (line
, '\0') + 1;
169 /* LINE does not point within DATA->linebuffer, so that space is
170 not being used for scratch space right now. We can use all of
171 it for the pointer vector storage. */
172 eol
= data
->linebuffer
;
173 /* Adjust the pointer so it is aligned for storing pointers. */
174 eol
+= __alignof__ (char *) - 1;
175 eol
-= (eol
- (char *) 0) % __alignof__ (char *);
176 /* We will start the storage here for the vector of pointers. */
177 list
= (char **) eol
;
184 if ((size_t) ((char *) &p
[1] - (char *) data
) > datalen
)
186 /* We cannot fit another pointer in the buffer. */
187 __set_errno (ERANGE
);
193 /* Skip leading white space. This might not be portable but useful. */
194 while (isspace (*line
))
200 if (*line
== '\0' || TRAILING_LIST_SEPARATOR_P (*line
))
202 /* End of the next entry. */
204 /* We really found some data. */
207 /* Terminate string if necessary. */
220 # endif /* TRAILING_LIST_MEMBER */
221 #endif /* EXTERN_PARSER */
224 #define LOOKUP_NAME(nameelt, aliaselt) \
227 if (! strcmp (name, result->nameelt)) \
229 for (ap = result->aliaselt; *ap; ++ap) \
230 if (! strcmp (name, *ap)) \
236 #define LOOKUP_NAME_CASE(nameelt, aliaselt) \
239 if (! __strcasecmp (name, result->nameelt)) \
241 for (ap = result->aliaselt; *ap; ++ap) \
242 if (! __strcasecmp (name, *ap)) \
249 /* This is defined by db-*.c to include "../nss_db/db-XXX.c" instead. */
251 # define GENERIC "files-XXX.c"