mirror of
https://github.com/samba-team/samba.git
synced 2025-03-20 22:50:26 +03:00
Move ini-like file parser to the utility library.
(This used to be commit 2dc2bb800dab3f7dbdba01f5ca5076edd1a2b0f3)
This commit is contained in:
Jelmer Vernooij
parent
5a498290b0
commit
14a54761d9
@ -18,7 +18,8 @@ OBJ_FILES = xfile.o \
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ms_fnmatch.o \
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mutex.o \
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idtree.o \
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become_daemon.o
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become_daemon.o \
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params.o
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PUBLIC_DEPENDENCIES = \
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LIBTALLOC LIBCRYPTO \
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SOCKET_WRAPPER LIBREPLACE_NETWORK \
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@ -795,4 +795,12 @@ _PUBLIC_ int idr_remove(struct idr_context *idp, int id);
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**/
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_PUBLIC_ void become_daemon(bool fork);
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/**
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* Load a ini-style file.
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*/
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bool pm_process( const char *fileName,
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bool (*sfunc)(const char *, void *),
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bool (*pfunc)(const char *, const char *, void *),
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void *userdata);
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#endif /* _SAMBA_UTIL_H_ */
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@ -1,6 +1,5 @@
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[SUBSYSTEM::LIBSAMBA-CONFIG]
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OBJ_FILES = loadparm.o \
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params.o \
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generic.o \
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util.o \
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../lib/version.o
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@ -1,587 +0,0 @@
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/* -------------------------------------------------------------------------- **
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* Microsoft Network Services for Unix, AKA., Andrew Tridgell's SAMBA.
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*
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* This module Copyright (C) 1990-1998 Karl Auer
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*
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* Rewritten almost completely by Christopher R. Hertel
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* at the University of Minnesota, September, 1997.
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* This module Copyright (C) 1997-1998 by the University of Minnesota
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* -------------------------------------------------------------------------- **
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------- **
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*
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* Module name: params
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*
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* -------------------------------------------------------------------------- **
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*
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* This module performs lexical analysis and initial parsing of a
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* Windows-like parameter file. It recognizes and handles four token
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* types: section-name, parameter-name, parameter-value, and
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* end-of-file. Comments and line continuation are handled
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* internally.
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*
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* The entry point to the module is function pm_process(). This
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* function opens the source file, calls the Parse() function to parse
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* the input, and then closes the file when either the EOF is reached
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* or a fatal error is encountered.
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*
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* A sample parameter file might look like this:
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*
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* [section one]
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* parameter one = value string
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* parameter two = another value
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* [section two]
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* new parameter = some value or t'other
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*
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* The parameter file is divided into sections by section headers:
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* section names enclosed in square brackets (eg. [section one]).
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* Each section contains parameter lines, each of which consist of a
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* parameter name and value delimited by an equal sign. Roughly, the
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* syntax is:
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*
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* <file> :== { <section> } EOF
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*
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* <section> :== <section header> { <parameter line> }
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*
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* <section header> :== '[' NAME ']'
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*
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* <parameter line> :== NAME '=' VALUE '\n'
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*
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* Blank lines and comment lines are ignored. Comment lines are lines
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* beginning with either a semicolon (';') or a pound sign ('#').
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*
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* All whitespace in section names and parameter names is compressed
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* to single spaces. Leading and trailing whitespace is stipped from
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* both names and values.
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*
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* Only the first equals sign in a parameter line is significant.
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* Parameter values may contain equals signs, square brackets and
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* semicolons. Internal whitespace is retained in parameter values,
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* with the exception of the '\r' character, which is stripped for
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* historic reasons. Parameter names may not start with a left square
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* bracket, an equal sign, a pound sign, or a semicolon, because these
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* are used to identify other tokens.
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*
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* -------------------------------------------------------------------------- **
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*/
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#include "includes.h"
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#include "system/locale.h"
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/* -------------------------------------------------------------------------- **
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* Constants...
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*/
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#define BUFR_INC 1024
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/* we can't use FILE* due to the 256 fd limit - use this cheap hack
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instead */
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typedef struct {
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char *buf;
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char *p;
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size_t size;
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char *bufr;
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int bSize;
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} myFILE;
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static int mygetc(myFILE *f)
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{
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if (f->p >= f->buf+f->size) return EOF;
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/* be sure to return chars >127 as positive values */
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return (int)( *(f->p++) & 0x00FF );
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}
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static void myfile_close(myFILE *f)
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{
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talloc_free(f);
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}
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/* -------------------------------------------------------------------------- **
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* Functions...
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*/
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static int EatWhitespace( myFILE *InFile )
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/* ------------------------------------------------------------------------ **
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* Scan past whitespace (see ctype(3C)) and return the first non-whitespace
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* character, or newline, or EOF.
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*
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* Input: InFile - Input source.
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*
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* Output: The next non-whitespace character in the input stream.
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*
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* Notes: Because the config files use a line-oriented grammar, we
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* explicitly exclude the newline character from the list of
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* whitespace characters.
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* - Note that both EOF (-1) and the nul character ('\0') are
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* considered end-of-file markers.
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*
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* ------------------------------------------------------------------------ **
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*/
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{
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int c;
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for( c = mygetc( InFile ); isspace( c ) && ('\n' != c); c = mygetc( InFile ) )
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;
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return( c );
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} /* EatWhitespace */
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static int EatComment( myFILE *InFile )
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/* ------------------------------------------------------------------------ **
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* Scan to the end of a comment.
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*
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* Input: InFile - Input source.
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*
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* Output: The character that marks the end of the comment. Normally,
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* this will be a newline, but it *might* be an EOF.
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*
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* Notes: Because the config files use a line-oriented grammar, we
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* explicitly exclude the newline character from the list of
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* whitespace characters.
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* - Note that both EOF (-1) and the nul character ('\0') are
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* considered end-of-file markers.
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*
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* ------------------------------------------------------------------------ **
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*/
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{
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int c;
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for( c = mygetc( InFile ); ('\n'!=c) && (EOF!=c) && (c>0); c = mygetc( InFile ) )
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;
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return( c );
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} /* EatComment */
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/*****************************************************************************
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* Scan backards within a string to discover if the last non-whitespace
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* character is a line-continuation character ('\\').
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*
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* Input: line - A pointer to a buffer containing the string to be
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* scanned.
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* pos - This is taken to be the offset of the end of the
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* string. This position is *not* scanned.
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*
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* Output: The offset of the '\\' character if it was found, or -1 to
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* indicate that it was not.
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*
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*****************************************************************************/
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static int Continuation(char *line, int pos )
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{
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pos--;
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while( (pos >= 0) && isspace((int)line[pos]))
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pos--;
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return (((pos >= 0) && ('\\' == line[pos])) ? pos : -1 );
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}
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static bool Section( myFILE *InFile, bool (*sfunc)(const char *, void *), void *userdata )
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/* ------------------------------------------------------------------------ **
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* Scan a section name, and pass the name to function sfunc().
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*
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* Input: InFile - Input source.
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* sfunc - Pointer to the function to be called if the section
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* name is successfully read.
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*
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* Output: true if the section name was read and true was returned from
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* <sfunc>. false if <sfunc> failed or if a lexical error was
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* encountered.
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*
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* ------------------------------------------------------------------------ **
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*/
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{
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int c;
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int i;
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int end;
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const char *func = "params.c:Section() -";
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i = 0; /* <i> is the offset of the next free byte in bufr[] and */
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end = 0; /* <end> is the current "end of string" offset. In most */
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/* cases these will be the same, but if the last */
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/* character written to bufr[] is a space, then <end> */
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/* will be one less than <i>. */
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c = EatWhitespace( InFile ); /* We've already got the '['. Scan */
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/* past initial white space. */
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while( (EOF != c) && (c > 0) )
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{
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/* Check that the buffer is big enough for the next character. */
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if( i > (InFile->bSize - 2) )
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{
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char *tb;
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tb = talloc_realloc(InFile, InFile->bufr, char, InFile->bSize + BUFR_INC);
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if( NULL == tb )
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{
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DEBUG(0, ("%s Memory re-allocation failure.", func) );
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return( false );
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}
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InFile->bufr = tb;
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InFile->bSize += BUFR_INC;
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}
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/* Handle a single character. */
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switch( c )
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{
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case ']': /* Found the closing bracket. */
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InFile->bufr[end] = '\0';
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if( 0 == end ) /* Don't allow an empty name. */
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{
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DEBUG(0, ("%s Empty section name in configuration file.\n", func ));
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return( false );
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}
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if( !sfunc(InFile->bufr,userdata) ) /* Got a valid name. Deal with it. */
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return( false );
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(void)EatComment( InFile ); /* Finish off the line. */
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return( true );
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case '\n': /* Got newline before closing ']'. */
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i = Continuation( InFile->bufr, i ); /* Check for line continuation. */
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if( i < 0 )
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{
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InFile->bufr[end] = '\0';
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DEBUG(0, ("%s Badly formed line in configuration file: %s\n",
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func, InFile->bufr ));
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return( false );
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}
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end = ( (i > 0) && (' ' == InFile->bufr[i - 1]) ) ? (i - 1) : (i);
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c = mygetc( InFile ); /* Continue with next line. */
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break;
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default: /* All else are a valid name chars. */
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if( isspace( c ) ) /* One space per whitespace region. */
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{
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InFile->bufr[end] = ' ';
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i = end + 1;
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c = EatWhitespace( InFile );
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}
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else /* All others copy verbatim. */
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{
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InFile->bufr[i++] = c;
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end = i;
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c = mygetc( InFile );
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}
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}
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}
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/* We arrive here if we've met the EOF before the closing bracket. */
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DEBUG(0, ("%s Unexpected EOF in the configuration file\n", func));
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return( false );
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} /* Section */
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static bool Parameter( myFILE *InFile, bool (*pfunc)(const char *, const char *, void *), int c, void *userdata )
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/* ------------------------------------------------------------------------ **
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* Scan a parameter name and value, and pass these two fields to pfunc().
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*
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* Input: InFile - The input source.
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* pfunc - A pointer to the function that will be called to
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* process the parameter, once it has been scanned.
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* c - The first character of the parameter name, which
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* would have been read by Parse(). Unlike a comment
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* line or a section header, there is no lead-in
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* character that can be discarded.
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*
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* Output: true if the parameter name and value were scanned and processed
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* successfully, else false.
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*
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* Notes: This function is in two parts. The first loop scans the
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* parameter name. Internal whitespace is compressed, and an
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* equal sign (=) terminates the token. Leading and trailing
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* whitespace is discarded. The second loop scans the parameter
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* value. When both have been successfully identified, they are
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* passed to pfunc() for processing.
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*
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* ------------------------------------------------------------------------ **
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*/
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{
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int i = 0; /* Position within bufr. */
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int end = 0; /* bufr[end] is current end-of-string. */
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int vstart = 0; /* Starting position of the parameter value. */
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const char *func = "params.c:Parameter() -";
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/* Read the parameter name. */
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while( 0 == vstart ) /* Loop until we've found the start of the value. */
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{
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if( i > (InFile->bSize - 2) ) /* Ensure there's space for next char. */
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{
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char *tb;
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tb = talloc_realloc(InFile, InFile->bufr, char, InFile->bSize + BUFR_INC );
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if( NULL == tb )
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{
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DEBUG(0, ("%s Memory re-allocation failure.", func) );
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return( false );
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}
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InFile->bufr = tb;
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InFile->bSize += BUFR_INC;
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}
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switch( c )
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{
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case '=': /* Equal sign marks end of param name. */
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if( 0 == end ) /* Don't allow an empty name. */
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{
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DEBUG(0, ("%s Invalid parameter name in config. file.\n", func ));
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return( false );
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}
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InFile->bufr[end++] = '\0'; /* Mark end of string & advance. */
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i = end; /* New string starts here. */
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vstart = end; /* New string is parameter value. */
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InFile->bufr[i] = '\0'; /* New string is nul, for now. */
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break;
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case '\n': /* Find continuation char, else error. */
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i = Continuation( InFile->bufr, i );
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if( i < 0 )
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{
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InFile->bufr[end] = '\0';
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DEBUG(1,("%s Ignoring badly formed line in configuration file: %s\n",
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func, InFile->bufr ));
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return( true );
|
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}
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end = ( (i > 0) && (' ' == InFile->bufr[i - 1]) ) ? (i - 1) : (i);
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c = mygetc( InFile ); /* Read past eoln. */
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break;
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case '\0': /* Shouldn't have EOF within param name. */
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case EOF:
|
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InFile->bufr[i] = '\0';
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DEBUG(1,("%s Unexpected end-of-file at: %s\n", func, InFile->bufr ));
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return( true );
|
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|
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default:
|
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if( isspace( c ) ) /* One ' ' per whitespace region. */
|
||||
{
|
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InFile->bufr[end] = ' ';
|
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i = end + 1;
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c = EatWhitespace( InFile );
|
||||
}
|
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else /* All others verbatim. */
|
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{
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InFile->bufr[i++] = c;
|
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end = i;
|
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c = mygetc( InFile );
|
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}
|
||||
}
|
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}
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|
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/* Now parse the value. */
|
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c = EatWhitespace( InFile ); /* Again, trim leading whitespace. */
|
||||
while( (EOF !=c) && (c > 0) )
|
||||
{
|
||||
|
||||
if( i > (InFile->bSize - 2) ) /* Make sure there's enough room. */
|
||||
{
|
||||
char *tb;
|
||||
|
||||
tb = talloc_realloc(InFile, InFile->bufr, char, InFile->bSize + BUFR_INC );
|
||||
if( NULL == tb )
|
||||
{
|
||||
DEBUG(0, ("%s Memory re-allocation failure.", func) );
|
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return( false );
|
||||
}
|
||||
InFile->bufr = tb;
|
||||
InFile->bSize += BUFR_INC;
|
||||
}
|
||||
|
||||
switch( c )
|
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{
|
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case '\r': /* Explicitly remove '\r' because the older */
|
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c = mygetc( InFile ); /* version called fgets_slash() which also */
|
||||
break; /* removes them. */
|
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|
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case '\n': /* Marks end of value unless there's a '\'. */
|
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i = Continuation( InFile->bufr, i );
|
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if( i < 0 )
|
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c = 0;
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||||
else
|
||||
{
|
||||
for( end = i; (end >= 0) && isspace((int)InFile->bufr[end]); end-- )
|
||||
;
|
||||
c = mygetc( InFile );
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}
|
||||
break;
|
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|
||||
default: /* All others verbatim. Note that spaces do */
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InFile->bufr[i++] = c; /* not advance <end>. This allows trimming */
|
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if( !isspace( c ) ) /* of whitespace at the end of the line. */
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end = i;
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c = mygetc( InFile );
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break;
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}
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}
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InFile->bufr[end] = '\0'; /* End of value. */
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return( pfunc( InFile->bufr, &InFile->bufr[vstart], userdata ) ); /* Pass name & value to pfunc(). */
|
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} /* Parameter */
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||||
|
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static bool Parse( myFILE *InFile,
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bool (*sfunc)(const char *, void *),
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bool (*pfunc)(const char *, const char *, void *),
|
||||
void *userdata )
|
||||
/* ------------------------------------------------------------------------ **
|
||||
* Scan & parse the input.
|
||||
*
|
||||
* Input: InFile - Input source.
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||||
* sfunc - Function to be called when a section name is scanned.
|
||||
* See Section().
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||||
* pfunc - Function to be called when a parameter is scanned.
|
||||
* See Parameter().
|
||||
*
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* Output: true if the file was successfully scanned, else false.
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||||
*
|
||||
* Notes: The input can be viewed in terms of 'lines'. There are four
|
||||
* types of lines:
|
||||
* Blank - May contain whitespace, otherwise empty.
|
||||
* Comment - First non-whitespace character is a ';' or '#'.
|
||||
* The remainder of the line is ignored.
|
||||
* Section - First non-whitespace character is a '['.
|
||||
* Parameter - The default case.
|
||||
*
|
||||
* ------------------------------------------------------------------------ **
|
||||
*/
|
||||
{
|
||||
int c;
|
||||
|
||||
c = EatWhitespace( InFile );
|
||||
while( (EOF != c) && (c > 0) )
|
||||
{
|
||||
switch( c )
|
||||
{
|
||||
case '\n': /* Blank line. */
|
||||
c = EatWhitespace( InFile );
|
||||
break;
|
||||
|
||||
case ';': /* Comment line. */
|
||||
case '#':
|
||||
c = EatComment( InFile );
|
||||
break;
|
||||
|
||||
case '[': /* Section Header. */
|
||||
if( !Section( InFile, sfunc, userdata ) )
|
||||
return( false );
|
||||
c = EatWhitespace( InFile );
|
||||
break;
|
||||
|
||||
case '\\': /* Bogus backslash. */
|
||||
c = EatWhitespace( InFile );
|
||||
break;
|
||||
|
||||
default: /* Parameter line. */
|
||||
if( !Parameter( InFile, pfunc, c, userdata ) )
|
||||
return( false );
|
||||
c = EatWhitespace( InFile );
|
||||
break;
|
||||
}
|
||||
}
|
||||
return( true );
|
||||
} /* Parse */
|
||||
|
||||
static myFILE *OpenConfFile( const char *FileName )
|
||||
/* ------------------------------------------------------------------------ **
|
||||
* Open a configuration file.
|
||||
*
|
||||
* Input: FileName - The pathname of the config file to be opened.
|
||||
*
|
||||
* Output: A pointer of type (char **) to the lines of the file
|
||||
*
|
||||
* ------------------------------------------------------------------------ **
|
||||
*/
|
||||
{
|
||||
const char *func = "params.c:OpenConfFile() -";
|
||||
myFILE *ret;
|
||||
|
||||
ret = talloc(talloc_autofree_context(), myFILE);
|
||||
if (!ret) return NULL;
|
||||
|
||||
ret->buf = file_load(FileName, &ret->size, ret);
|
||||
if( NULL == ret->buf )
|
||||
{
|
||||
DEBUG( 1,
|
||||
("%s Unable to open configuration file \"%s\":\n\t%s\n",
|
||||
func, FileName, strerror(errno)) );
|
||||
talloc_free(ret);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
ret->p = ret->buf;
|
||||
ret->bufr = NULL;
|
||||
ret->bSize = 0;
|
||||
return( ret );
|
||||
} /* OpenConfFile */
|
||||
|
||||
bool pm_process( const char *FileName,
|
||||
bool (*sfunc)(const char *, void *),
|
||||
bool (*pfunc)(const char *, const char *, void *),
|
||||
void *userdata)
|
||||
/* ------------------------------------------------------------------------ **
|
||||
* Process the named parameter file.
|
||||
*
|
||||
* Input: FileName - The pathname of the parameter file to be opened.
|
||||
* sfunc - A pointer to a function that will be called when
|
||||
* a section name is discovered.
|
||||
* pfunc - A pointer to a function that will be called when
|
||||
* a parameter name and value are discovered.
|
||||
*
|
||||
* Output: TRUE if the file was successfully parsed, else FALSE.
|
||||
*
|
||||
* ------------------------------------------------------------------------ **
|
||||
*/
|
||||
{
|
||||
int result;
|
||||
myFILE *InFile;
|
||||
const char *func = "params.c:pm_process() -";
|
||||
|
||||
InFile = OpenConfFile( FileName ); /* Open the config file. */
|
||||
if( NULL == InFile )
|
||||
return( false );
|
||||
|
||||
DEBUG( 3, ("%s Processing configuration file \"%s\"\n", func, FileName) );
|
||||
|
||||
if( NULL != InFile->bufr ) /* If we already have a buffer */
|
||||
result = Parse( InFile, sfunc, pfunc, userdata ); /* (recursive call), then just */
|
||||
/* use it. */
|
||||
|
||||
else /* If we don't have a buffer */
|
||||
{ /* allocate one, then parse, */
|
||||
InFile->bSize = BUFR_INC; /* then free. */
|
||||
InFile->bufr = talloc_array(InFile, char, InFile->bSize );
|
||||
if( NULL == InFile->bufr )
|
||||
{
|
||||
DEBUG(0,("%s memory allocation failure.\n", func));
|
||||
myfile_close(InFile);
|
||||
return( false );
|
||||
}
|
||||
result = Parse( InFile, sfunc, pfunc, userdata );
|
||||
InFile->bufr = NULL;
|
||||
InFile->bSize = 0;
|
||||
}
|
||||
|
||||
myfile_close(InFile);
|
||||
|
||||
if( !result ) /* Generic failure. */
|
||||
{
|
||||
DEBUG(0,("%s Failed. Error returned from params.c:parse().\n", func));
|
||||
return( false );
|
||||
}
|
||||
|
||||
return( true ); /* Generic success. */
|
||||
} /* pm_process */
|
||||
|
||||
/* -------------------------------------------------------------------------- */
|
||||
Loading…
x
Reference in New Issue
Block a user