diff options
Diffstat (limited to 'nss/nss_files/files-parse.c')
| -rw-r--r-- | nss/nss_files/files-parse.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/nss/nss_files/files-parse.c b/nss/nss_files/files-parse.c new file mode 100644 index 0000000000..a93bee1ab3 --- /dev/null +++ b/nss/nss_files/files-parse.c @@ -0,0 +1,171 @@ +/* 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 |