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glibc/nss/nss_files/files-parse.c
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/* Common code for file-based database parsers in nss_files module. | |
Copyright (C) 1996-2000, 2003 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 Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 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. | |
EXTRA_ARGS -- defined iff extra parameters must be passed to the parser | |
EXTRA_ARGS_DECL -- declaration for these extra parameters | |
EXTRA_ARGS_VALUE -- values to be passed for these parameters | |
Also see files-XXX.c. */ | |
#ifndef EXTRA_ARGS | |
# define EXTRA_ARGS | |
# define EXTRA_ARGS_DECL | |
# define EXTRA_ARGS_VALUE | |
#endif | |
#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 | |
# define nss_files_parse_hidden_def(name) | |
#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) | |
# define nss_files_parse_hidden_def(name) libc_hidden_def (name) | |
#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, size_t datalen, int *errnop | |
EXTRA_ARGS_DECL); | |
# 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, size_t datalen, int *errnop \ | |
EXTRA_ARGS_DECL) \ | |
{ \ | |
ENTDATA_DECL (data) \ | |
char *p = strpbrk (line, EOLSET "\n"); \ | |
if (p != NULL) \ | |
*p = '\0'; \ | |
BODY; \ | |
TRAILING_LIST_PARSER; \ | |
return 1; \ | |
} \ | |
nss_files_parse_hidden_def (parse_line) | |
# 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 (strtoul (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 INT_FIELD_MAYBE_NULL(variable, terminator_p, swallow, base, convert, default) \ | |
{ \ | |
char *endp; \ | |
if (*line == '\0') \ | |
/* We expect some more input, so don't allow the string to end here. */ \ | |
return 0; \ | |
variable = convert (strtoul (line, &endp, base)); \ | |
if (endp == line) \ | |
variable = default; \ | |
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, errnop); \ | |
if (list) \ | |
result->TRAILING_LIST_MEMBER = list; \ | |
else \ | |
return -1; /* -1 indicates we ran out of space. */ \ | |
} | |
static inline char ** | |
__attribute ((always_inline)) | |
parse_list (char *line, struct parser_data *data, size_t datalen, int *errnop) | |
{ | |
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 ((size_t) ((char *) &p[1] - (char *) data) > datalen) | |
{ | |
/* We cannot fit another pointer in the buffer. */ | |
*errnop = ERANGE; | |
return NULL; | |
} | |
if (*line == '\0') | |
break; | |
/* Skip leading white space. This might not be portable but useful. */ | |
while (isspace (*line)) | |
++line; | |
elt = line; | |
while (1) | |
{ | |
if (*line == '\0' || TRAILING_LIST_SEPARATOR_P (*line)) | |
{ | |
/* End of the next entry. */ | |
if (line > elt) | |
/* We really found some data. */ | |
*p++ = elt; | |
/* Terminate string if necessary. */ | |
if (*line != '\0') | |
*line++ = '\0'; | |
break; | |
} | |
++line; | |
} | |
} | |
*p = NULL; | |
return list; | |
} | |
# endif /* TRAILING_LIST_MEMBER */ | |
#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; \ | |
} | |
#define LOOKUP_NAME_CASE(nameelt, aliaselt) \ | |
{ \ | |
char **ap; \ | |
if (! __strcasecmp (name, result->nameelt)) \ | |
break; \ | |
for (ap = result->aliaselt; *ap; ++ap) \ | |
if (! __strcasecmp (name, *ap)) \ | |
break; \ | |
if (*ap) \ | |
break; \ | |
} | |
/* This is defined by db-*.c to include "../nss_db/db-XXX.c" instead. */ | |
#ifndef GENERIC | |
# define GENERIC "files-XXX.c" | |
#endif |