336 lines
9.9 KiB
C
336 lines
9.9 KiB
C
/* Common code for file-based database parsers in nss_files module.
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Copyright (C) 1996-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <ctype.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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/* These symbols are defined by the including source file:
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ENTNAME -- database name of the structure and functions (hostent, pwent).
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STRUCTURE -- struct name, define only if not ENTNAME (passwd, group).
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DATABASE -- string of the database file's name ("hosts", "passwd").
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ENTDATA -- if defined, `struct ENTDATA' is used by the parser to store
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things pointed to by the resultant `struct STRUCTURE'.
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NEED_H_ERRNO - defined iff an arg `int *herrnop' is used.
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EXTRA_ARGS -- defined iff extra parameters must be passed to the parser
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EXTRA_ARGS_DECL -- declaration for these extra parameters
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EXTRA_ARGS_VALUE -- values to be passed for these parameters
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Also see files-XXX.c. */
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#ifndef EXTRA_ARGS
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# define EXTRA_ARGS
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# define EXTRA_ARGS_DECL
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# define EXTRA_ARGS_VALUE
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#endif
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#define CONCAT(a,b) CONCAT1(a,b)
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#define CONCAT1(a,b) a##b
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#ifndef STRUCTURE
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# define STRUCTURE ENTNAME
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#endif
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struct parser_data
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{
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#ifdef ENTDATA
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struct ENTDATA entdata;
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# define ENTDATA_DECL(data) struct ENTDATA *const entdata = &data->entdata;
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#else
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# define ENTDATA_DECL(data)
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#endif
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char linebuffer[0];
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};
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#ifdef ENTDATA
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/* The function can't be exported, because the entdata structure
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is defined only in files-foo.c. */
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# define parser_stclass static
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# define nss_files_parse_hidden_def(name)
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#else
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/* Export the line parser function so it can be used in nss_db. */
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# define parser_stclass /* Global */
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# define parse_line CONCAT(_nss_files_parse_,ENTNAME)
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# if IS_IN (libc)
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/* We are defining one of the functions that actually lives in libc
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because it is used to implement fget*ent and suchlike. */
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# define nss_files_parse_hidden_def(name) libc_hidden_def (name)
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# else
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# define nss_files_parse_hidden_def(name) libnss_files_hidden_def (name)
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# endif
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#endif
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#ifdef EXTERN_PARSER
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/* The parser is defined in a different module. */
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extern int parse_line (char *line, struct STRUCTURE *result,
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struct parser_data *data, size_t datalen, int *errnop
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EXTRA_ARGS_DECL);
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# define LINE_PARSER(EOLSET, BODY) /* Do nothing */
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#else
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/* Define a line parsing function. */
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# define LINE_PARSER(EOLSET, BODY) \
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parser_stclass int \
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parse_line (char *line, struct STRUCTURE *result, \
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struct parser_data *data, size_t datalen, int *errnop \
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EXTRA_ARGS_DECL) \
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{ \
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ENTDATA_DECL (data) \
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BUFFER_PREPARE \
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char *p = strpbrk (line, EOLSET "\n"); \
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if (p != NULL) \
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*p = '\0'; \
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BODY; \
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TRAILING_LIST_PARSER; \
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return 1; \
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} \
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nss_files_parse_hidden_def (parse_line)
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# define STRING_FIELD(variable, terminator_p, swallow) \
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{ \
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variable = line; \
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while (*line != '\0' && !terminator_p (*line)) \
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++line; \
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if (*line != '\0') \
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{ \
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*line = '\0'; \
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do \
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++line; \
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while (swallow && terminator_p (*line)); \
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} \
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}
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# define STRING_LIST(variable, terminator_c) \
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{ \
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char **list = parse_list (&line, buf_start, buf_end, terminator_c, \
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errnop); \
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if (list) \
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variable = list; \
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else \
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return -1; /* -1 indicates we ran out of space. */ \
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\
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/* Determine the new end of the buffer. */ \
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while (*list != NULL) \
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++list; \
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buf_start = (char *) (list + 1); \
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}
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/* Helper function. */
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static inline uint32_t
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__attribute__ ((always_inline))
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strtou32 (const char *nptr, char **endptr, int base)
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{
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unsigned long int val = strtoul (nptr, endptr, base);
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/* Match the 32-bit behavior on 64-bit platforms. */
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if (sizeof (long int) > 4 && val > 0xffffffff)
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val = 0xffffffff;
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return val;
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}
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# define INT_FIELD(variable, terminator_p, swallow, base, convert) \
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{ \
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char *endp; \
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variable = convert (strtou32 (line, &endp, base)); \
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if (endp == line) \
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return 0; \
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else if (terminator_p (*endp)) \
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do \
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++endp; \
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while (swallow && terminator_p (*endp)); \
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else if (*endp != '\0') \
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return 0; \
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line = endp; \
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}
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# define INT_FIELD_MAYBE_NULL(variable, terminator_p, swallow, base, convert, default) \
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{ \
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char *endp; \
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if (*line == '\0') \
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/* We expect some more input, so don't allow the string to end here. */ \
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return 0; \
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variable = convert (strtou32 (line, &endp, base)); \
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if (endp == line) \
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variable = default; \
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if (terminator_p (*endp)) \
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do \
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++endp; \
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while (swallow && terminator_p (*endp)); \
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else if (*endp != '\0') \
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return 0; \
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line = endp; \
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}
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# define ISCOLON(c) ((c) == ':')
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# ifndef TRAILING_LIST_MEMBER
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# define BUFFER_PREPARE /* Nothing to do. */
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# define TRAILING_LIST_PARSER /* Nothing to do. */
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# else
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# define BUFFER_PREPARE \
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char *buf_start = NULL; \
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char *buf_end = (char *) data + datalen; \
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if (line >= data->linebuffer && line < buf_end) \
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/* Find the end of the line buffer, we will use the space in \
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DATA after it for storing the vector of pointers. */ \
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buf_start = strchr (line, '\0') + 1; \
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else \
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/* LINE does not point within DATA->linebuffer, so that space is \
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not being used for scratch space right now. We can use all of \
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it for the pointer vector storage. */ \
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buf_start = data->linebuffer; \
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# define TRAILING_LIST_PARSER \
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{ \
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if (buf_start == NULL) \
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{ \
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if (line >= data->linebuffer && line < buf_end) \
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/* Find the end of the line buffer, we will use the space in \
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DATA after it for storing the vector of pointers. */ \
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buf_start = strchr (line, '\0') + 1; \
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else \
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/* LINE does not point within DATA->linebuffer, so that space is \
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not being used for scratch space right now. We can use all of \
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it for the pointer vector storage. */ \
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buf_start = data->linebuffer; \
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} \
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\
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char **list = parse_list (&line, buf_start, buf_end, '\0', errnop); \
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if (list) \
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result->TRAILING_LIST_MEMBER = list; \
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else \
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return -1; /* -1 indicates we ran out of space. */ \
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}
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static inline char **
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__attribute ((always_inline))
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parse_list (char **linep, char *eol, char *buf_end, int terminator_c,
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int *errnop)
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{
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char *line = *linep;
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char **list, **p;
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/* Adjust the pointer so it is aligned for storing pointers. */
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eol += __alignof__ (char *) - 1;
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eol -= (eol - (char *) 0) % __alignof__ (char *);
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/* We will start the storage here for the vector of pointers. */
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list = (char **) eol;
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p = list;
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while (1)
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{
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if ((char *) (p + 2) > buf_end)
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{
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/* We cannot fit another pointer in the buffer. */
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*errnop = ERANGE;
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return NULL;
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}
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if (*line == '\0')
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break;
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if (*line == terminator_c)
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{
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++line;
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break;
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}
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/* Skip leading white space. This might not be portable but useful. */
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while (isspace (*line))
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++line;
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char *elt = line;
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while (1)
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{
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if (*line == '\0' || *line == terminator_c
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|| TRAILING_LIST_SEPARATOR_P (*line))
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{
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/* End of the next entry. */
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if (line > elt)
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/* We really found some data. */
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*p++ = elt;
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/* Terminate string if necessary. */
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if (*line != '\0')
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{
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char endc = *line;
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*line++ = '\0';
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if (endc == terminator_c)
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goto out;
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}
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break;
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}
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++line;
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}
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}
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out:
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*p = NULL;
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*linep = line;
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return list;
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}
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# endif /* TRAILING_LIST_MEMBER */
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#endif /* EXTERN_PARSER */
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#define LOOKUP_NAME(nameelt, aliaselt) \
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{ \
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char **ap; \
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if (! strcmp (name, result->nameelt)) \
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break; \
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for (ap = result->aliaselt; *ap; ++ap) \
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if (! strcmp (name, *ap)) \
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break; \
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if (*ap) \
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break; \
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}
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#define LOOKUP_NAME_CASE(nameelt, aliaselt) \
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{ \
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char **ap; \
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if (! __strcasecmp (name, result->nameelt)) \
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break; \
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for (ap = result->aliaselt; *ap; ++ap) \
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if (! __strcasecmp (name, *ap)) \
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break; \
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if (*ap) \
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break; \
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}
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/* This is defined by db-*.c to include "../nss_db/db-XXX.c" instead. */
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#ifndef GENERIC
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# define GENERIC "files-XXX.c"
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#endif
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