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+/*
+ Unix SMB/Netbios implementation.
+ Version 1.9.
+ Parameter loading utlities
+ Copyright (C) Karl Auer 1993,1994
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/**************************************************************************
+PARAMS.C
+
+Copyright (C) 1990, 1991, 1992, 1993, 1994 Karl Auer
+
+This module provides for streamlines retrieval of information from a
+Windows-like parameter files. There is a function which will search for
+all sections in the file and call a specified function with each. There is
+a similar function which will call a specified function for all parameters
+in a section. The idea is that you pass the addresses of suitable functions
+to a single function in this module which will then enumerate all sections,
+and within each section all parameters, to your program.
+
+Parameter files contain text lines (newline delimited) which consist of
+either a section name in square brackets or a parameter name, delimited
+from the parameter value by an equals sign. Blank lines or lines where the
+first non-whitespace character is a colon are ignored. All whitespace in
+section names and parameter names is compressed to single spaces. Leading
+and trailing whitespace on parameter names and parameter values is stripped.
+
+Only the first equals sign in a parameter line is significant - parameter
+values may contain equals signs, square brackets and semicolons. Internal
+whitespace is retained in parameter values. Parameter names may not start
+with a square bracket, an equals sign or a semicolon, for obvious reasons.
+
+A sample parameter file might look like this:
+
+[things]
+this=1
+that=2
+[other things]
+the other = 3
+
+**************************************************************************/
+
+#include "includes.h"
+
+#include "smb.h"
+#include "params.h"
+
+/* local variable pointing to passed filename */
+static char *pszParmFile = NULL;
+extern int DEBUGLEVEL;
+
+/* local prototypes */
+static BOOL enumerate_parameters(FILE *infile, PM_PARMFUNC pfunc);
+static BOOL enumerate_sections(FILE *infile,
+ PM_SECFUNC sfunc, PM_PARMFUNC pfunc);
+
+/* prototypes for local toolbox functions */
+static void trimleft(char *psz);
+static void trimright(char *psz);
+static void collapse_spaces(char *psz);
+static int firstnonwhite(char *psz);
+
+/**************************************************************************
+Identifies all parameters in the current section, calls the parameter
+function for each. Ignores comment lines, stops and backs up in file when
+a section is encountered. Returns True on success, False on error.
+**************************************************************************/
+static BOOL enumerate_parameters(FILE *fileIn, PM_PARMFUNC pfunc)
+{
+ pstring szBuf;
+ char *pszTemp;
+ BOOL bRetval;
+ long lFileOffset;
+ int cTemp;
+ BOOL bParmFound;
+
+ bRetval = False;
+ bParmFound = False;
+ while (True)
+ {
+ /* first remember where we are */
+ if ((lFileOffset = ftell(fileIn)) >= 0L)
+ {
+ /* then get and check a line */
+ if (fgets_slash(szBuf, sizeof(szBuf)-1, fileIn) == NULL)
+ {
+ /* stop - return OK unless file error */
+ bRetval = !ferror(fileIn);
+ if (!bRetval)
+ DEBUG(0,( "Read error on configuration file (enumerating parameters)!\n"));
+ break;
+ }
+ else
+ /* if first non-white is a '[', stop (new section) */
+ if ((cTemp = firstnonwhite(szBuf)) == '[')
+ {
+ /* restore position to start of new section */
+ if (fseek(fileIn, lFileOffset, SEEK_SET) < 0L)
+ {
+ DEBUG(0,( "Seek error on configuration file!\n"));
+ break;
+ }
+
+ /* return success */
+ bRetval = True;
+ break;
+ }
+ else
+ /* if it's a semicolon or line is blank, ignore the line */
+ if (!cTemp || strchr(";#",cTemp))
+ {
+ continue;
+ }
+ else
+ /* if no equals sign and line contains non-whitespace */
+ /* then line is badly formed */
+ if ((pszTemp = strchr(szBuf, '=')) == NULL)
+ {
+ DEBUG(0,( "Ignoring badly formed line: %s", szBuf));
+ }
+ else
+ {
+ /* Note that we have found a parameter */
+ bParmFound = True;
+ /* cut line at the equals sign */
+ *pszTemp++ = '\0';
+ /* trim leading and trailing space from both halves */
+ trimright(szBuf);
+ trimleft(szBuf);
+ trimright(pszTemp);
+ trimleft(pszTemp);
+ /* process the parameter iff passed pointer not NULL */
+ if (pfunc != NULL)
+ if (!pfunc(szBuf, pszTemp))
+ break;
+ }
+ }
+ }
+ return (bRetval);
+}
+
+
+/***********************************************************************
+Close up s by n chars, at offset start.
+***********************************************************************/
+static void closestr(char *s, int start, int n)
+{
+ char *src;
+ char *dest;
+ int len;
+
+ if (n > 0)
+ if ((src = dest = s) != NULL)
+ {
+ len = strlen(s);
+ if (start >= 0 && start < len - n)
+ {
+ src += start + n;
+ dest += start;
+
+ while (*src)
+ *dest++ = *src++;
+ *dest = '\0';
+ }
+ }
+}
+
+/**************************************************************************
+Identifies all sections in the parameter file, calls passed section_func()
+for each, passing the section name, then calls enumerate_parameters().
+Returns True on success, False on failure. Note that the section and
+parameter names will have all internal whitespace areas collapsed to a
+single space for processing.
+**************************************************************************/
+static BOOL enumerate_sections(FILE *fileIn,
+ PM_SECFUNC sfunc, PM_PARMFUNC pfunc)
+{
+ pstring szBuf;
+ BOOL bRetval;
+ BOOL bSectionFound;
+
+ /* this makes sure we get include lines right */
+ enumerate_parameters(fileIn, pfunc);
+
+ bRetval = False;
+ bSectionFound = False;
+ while (True)
+ {
+ if (fgets_slash(szBuf, sizeof(szBuf)-1, fileIn) == NULL)
+ {
+ /* stop - return OK unless file error */
+ bRetval = !ferror(fileIn);
+ if (!bRetval)
+ DEBUG(0,( "Read error on configuration file (enumerating sections)!\n"));
+ break;
+ }
+ else
+ {
+ trimleft(szBuf);
+ trimright(szBuf);
+ if (szBuf[0] == '[')
+ {
+ closestr(szBuf, 0, 1);
+ if (strlen(szBuf) > 1)
+ if (szBuf[strlen(szBuf) - 1] == ']')
+ {
+ /* found a section - note the fact */
+ bSectionFound = True;
+ /* remove trailing metabracket */
+ szBuf[strlen(szBuf) - 1] = '\0';
+ /* remove leading and trailing whitespace from name */
+ trimleft(szBuf);
+ trimright(szBuf);
+ /* reduce all internal whitespace to one space */
+ collapse_spaces(szBuf);
+ /* process it - stop if the processing fails */
+ if (sfunc != NULL)
+ if (!sfunc(szBuf))
+ break;
+ if (!enumerate_parameters(fileIn, pfunc))
+ break;
+ }
+ }
+ }
+ }
+
+ return (bRetval);
+}
+
+/**************************************************************************
+Process the passed parameter file.
+
+Returns True if successful, else False.
+**************************************************************************/
+BOOL pm_process(char *pszFileName, PM_SECFUNC sfunc, PM_PARMFUNC pfunc)
+{
+ FILE *fileIn;
+ BOOL bRetval;
+
+ bRetval = False;
+
+ /* record the filename for use in error messages one day... */
+ pszParmFile = pszFileName;
+
+ if (pszParmFile == NULL || strlen(pszParmFile) < 1)
+ DEBUG(0,( "No configuration filename specified!\n"));
+ else
+ if ((fileIn = fopen(pszParmFile, "r")) == NULL)
+ DEBUG(0,( "Unable to open configuration file \"%s\"!\n", pszParmFile));
+ else
+ {
+ DEBUG(2,( "Processing configuration file \"%s\"\n", pszParmFile));
+ bRetval = enumerate_sections(fileIn, sfunc, pfunc);
+ fclose(fileIn);
+ }
+
+ if (!bRetval)
+ DEBUG(0,("pm_process retuned false\n"));
+ return (bRetval);
+}
+
+
+/**************************************************************************
+Strip all leading whitespace from a string.
+**************************************************************************/
+static void trimleft(char *psz)
+{
+ char *pszDest;
+
+ pszDest = psz;
+ if (psz != NULL)
+ {
+ while (*psz != '\0' && isspace(*psz))
+ psz++;
+ while (*psz != '\0')
+ *pszDest++ = *psz++;
+ *pszDest = '\0';
+ }
+}
+
+/**************************************************************************
+Strip all trailing whitespace from a string.
+**************************************************************************/
+static void trimright(char *psz)
+{
+ char *pszTemp;
+
+ if (psz != NULL && psz[0] != '\0')
+ {
+ pszTemp = psz + strlen(psz) - 1;
+ while (isspace(*pszTemp))
+ *pszTemp-- = '\0';
+ }
+}
+
+/***********************************************************************
+Collapse each whitespace area in a string to a single space.
+***********************************************************************/
+static void collapse_spaces(char *psz)
+{
+ while (*psz)
+ if (isspace(*psz))
+ {
+ *psz++ = ' ';
+ trimleft(psz);
+ }
+ else
+ psz++;
+}
+
+/**************************************************************************
+Return the value of the first non-white character in the specified string.
+The terminating NUL counts as non-white for the purposes of this function.
+Note - no check for a NULL string! What would we return?
+**************************************************************************/
+static int firstnonwhite(char *psz)
+{
+ while (isspace(*psz) && (*psz != '\0'))
+ psz++;
+ return (*psz);
+}
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