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/* 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>
#define CONCAT(a,b) CONCAT1(a,b)
#define CONCAT1(a,b) a##b
#ifndef STRUCTURE
#define STRUCTURE ENTNAME
#endif
struct parser_data
{
struct CONCAT(ENTNAME,_data) entdata;
char linebuffer[0];
};
#define LINE_PARSER(BODY) \
static inline int \
parse_line (char *line, struct STRUCTURE *result, \
struct parser_data *data, int datalen) \
{ \
struct CONCAT(ENTNAME,_data) *const entdata __attribute__ ((unused)) \
= &data->entdata; \
BODY; \
TRAILING_LIST_PARSER; \
return 1; \
}
/* Comments can come mid-line; trim the line at the first # seen. */
#define MIDLINE_COMMENTS \
{ \
char *p = strchr (line, '#'); \
if (p) \
*p = '\0'; \
}
#define STRING_FIELD(variable, terminator_p, swallow) \
{ \
variable = line; \
while (!terminator_p (*line)) \
if (*++line == '\0') \
return 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;
/* Find the end of the line buffer. */
eol = strchr (line, '\0');
/* Adjust the pointer so it is aligned for storing pointers. */
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));
}
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;
}
#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
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