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And helper functions __nss_readline, __nss_readline_seek, __nss_parse_line_result. This consolidates common code for handling overlong lines and parse files. Use the new functionality in internal_getent in nss/nss_files/files-XXX.c. Tested-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
85 lines
3.7 KiB
C
85 lines
3.7 KiB
C
/* Internal routines for nss_files.
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Copyright (C) 2020 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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<https://www.gnu.org/licenses/>. */
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#ifndef _NSS_FILES_H
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#define _NSS_FILES_H
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#include <stdio.h>
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/* Open PATH for reading, as a data source for nss_files. */
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FILE *__nss_files_fopen (const char *path);
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libc_hidden_proto (__nss_files_fopen)
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/* Read a line from FP, storing it BUF. Strip leading blanks and skip
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comments. Sets errno and returns error code on failure. Special
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failure: ERANGE means the buffer is too small. The function writes
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the original offset to *POFFSET (which can be negative in the case
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of non-seekable input). */
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int __nss_readline (FILE *fp, char *buf, size_t len, off64_t *poffset);
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libc_hidden_proto (__nss_readline)
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/* Seek FP to OFFSET. Sets errno and returns error code on failure.
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On success, sets errno to ERANGE and returns ERANGE (to indicate
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re-reading of the same input line to the caller). If OFFSET is
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negative, fail with ESPIPE without seeking. Intended to be used
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after parsing data read by __nss_readline failed with ERANGE. */
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int __nss_readline_seek (FILE *fp, off64_t offset) attribute_hidden;
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/* Handles the result of a parse_line call (as defined by
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nss/nss_files/files-parse.c). Adjusts the file offset of FP as
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necessary. Returns 0 on success, and updates errno on failure (and
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returns that error code). */
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int __nss_parse_line_result (FILE *fp, off64_t offset, int parse_line_result);
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libc_hidden_proto (__nss_parse_line_result)
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struct parser_data;
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/* Instances of the parse_line function from
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nss/nss_files/files-parse.c. */
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typedef int nss_files_parse_line (char *line, void *result,
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struct parser_data *data,
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size_t datalen, int *errnop);
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extern nss_files_parse_line _nss_files_parse_etherent;
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extern nss_files_parse_line _nss_files_parse_grent;
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extern nss_files_parse_line _nss_files_parse_netent;
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extern nss_files_parse_line _nss_files_parse_protoent;
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extern nss_files_parse_line _nss_files_parse_pwent;
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extern nss_files_parse_line _nss_files_parse_rpcent;
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extern nss_files_parse_line _nss_files_parse_servent;
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extern nss_files_parse_line _nss_files_parse_sgent;
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extern nss_files_parse_line _nss_files_parse_spent;
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libnss_files_hidden_proto (_nss_files_parse_etherent)
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libc_hidden_proto (_nss_files_parse_grent)
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libnss_files_hidden_proto (_nss_files_parse_netent)
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libnss_files_hidden_proto (_nss_files_parse_protoent)
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libc_hidden_proto (_nss_files_parse_pwent)
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libnss_files_hidden_proto (_nss_files_parse_rpcent)
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libnss_files_hidden_proto (_nss_files_parse_servent)
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libc_hidden_proto (_nss_files_parse_sgent)
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libc_hidden_proto (_nss_files_parse_spent)
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/* Generic implementation of fget*ent_r. Reads lines from FP until
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EOF or a successful parse into *RESULT using PARSER. Returns 0 on
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success, ENOENT on EOF, ERANGE on too-small buffer. */
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int __nss_fgetent_r (FILE *fp, void *result,
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char *buffer, size_t buffer_length,
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nss_files_parse_line parser) attribute_hidden;
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#endif /* _NSS_FILES_H */
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