diff options
Diffstat (limited to 'source4/lib/util/params.c')
| -rw-r--r-- | source4/lib/util/params.c | 587 |
1 files changed, 0 insertions, 587 deletions
diff --git a/source4/lib/util/params.c b/source4/lib/util/params.c deleted file mode 100644 index 3a9e2b9505..0000000000 --- a/source4/lib/util/params.c +++ /dev/null @@ -1,587 +0,0 @@ -/* -------------------------------------------------------------------------- ** - * Microsoft Network Services for Unix, AKA., Andrew Tridgell's SAMBA. - * - * This module Copyright (C) 1990-1998 Karl Auer - * - * Rewritten almost completely by Christopher R. Hertel - * at the University of Minnesota, September, 1997. - * This module Copyright (C) 1997-1998 by the University of Minnesota - * -------------------------------------------------------------------------- ** - * - * 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 3 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, see <http://www.gnu.org/licenses/>. - * - * -------------------------------------------------------------------------- ** - * - * Module name: params - * - * -------------------------------------------------------------------------- ** - * - * This module performs lexical analysis and initial parsing of a - * Windows-like parameter file. It recognizes and handles four token - * types: section-name, parameter-name, parameter-value, and - * end-of-file. Comments and line continuation are handled - * internally. - * - * The entry point to the module is function pm_process(). This - * function opens the source file, calls the Parse() function to parse - * the input, and then closes the file when either the EOF is reached - * or a fatal error is encountered. - * - * A sample parameter file might look like this: - * - * [section one] - * parameter one = value string - * parameter two = another value - * [section two] - * new parameter = some value or t'other - * - * The parameter file is divided into sections by section headers: - * section names enclosed in square brackets (eg. [section one]). - * Each section contains parameter lines, each of which consist of a - * parameter name and value delimited by an equal sign. Roughly, the - * syntax is: - * - * <file> :== { <section> } EOF - * - * <section> :== <section header> { <parameter line> } - * - * <section header> :== '[' NAME ']' - * - * <parameter line> :== NAME '=' VALUE '\n' - * - * Blank lines and comment lines are ignored. Comment lines are lines - * beginning with either a semicolon (';') or a pound sign ('#'). - * - * All whitespace in section names and parameter names is compressed - * to single spaces. Leading and trailing whitespace is stipped from - * both names and values. - * - * 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, - * with the exception of the '\r' character, which is stripped for - * historic reasons. Parameter names may not start with a left square - * bracket, an equal sign, a pound sign, or a semicolon, because these - * are used to identify other tokens. - * - * -------------------------------------------------------------------------- ** - */ - -#include "includes.h" -#include "system/locale.h" - -/* -------------------------------------------------------------------------- ** - * Constants... - */ - -#define BUFR_INC 1024 - - -/* we can't use FILE* due to the 256 fd limit - use this cheap hack - instead */ -typedef struct { - char *buf; - char *p; - size_t size; - char *bufr; - int bSize; -} myFILE; - -static int mygetc(myFILE *f) -{ - if (f->p >= f->buf+f->size) return EOF; - /* be sure to return chars >127 as positive values */ - return (int)( *(f->p++) & 0x00FF ); -} - -static void myfile_close(myFILE *f) -{ - talloc_free(f); -} - -/* -------------------------------------------------------------------------- ** - * Functions... - */ - -static int EatWhitespace( myFILE *InFile ) - /* ------------------------------------------------------------------------ ** - * Scan past whitespace (see ctype(3C)) and return the first non-whitespace - * character, or newline, or EOF. - * - * Input: InFile - Input source. - * - * Output: The next non-whitespace character in the input stream. - * - * Notes: Because the config files use a line-oriented grammar, we - * explicitly exclude the newline character from the list of - * whitespace characters. - * - Note that both EOF (-1) and the nul character ('\0') are - * considered end-of-file markers. - * - * ------------------------------------------------------------------------ ** - */ - { - int c; - - for( c = mygetc( InFile ); isspace( c ) && ('\n' != c); c = mygetc( InFile ) ) - ; - return( c ); - } /* EatWhitespace */ - -static int EatComment( myFILE *InFile ) - /* ------------------------------------------------------------------------ ** - * Scan to the end of a comment. - * - * Input: InFile - Input source. - * - * Output: The character that marks the end of the comment. Normally, - * this will be a newline, but it *might* be an EOF. - * - * Notes: Because the config files use a line-oriented grammar, we - * explicitly exclude the newline character from the list of - * whitespace characters. - * - Note that both EOF (-1) and the nul character ('\0') are - * considered end-of-file markers. - * - * ------------------------------------------------------------------------ ** - */ - { - int c; - - for( c = mygetc( InFile ); ('\n'!=c) && (EOF!=c) && (c>0); c = mygetc( InFile ) ) - ; - return( c ); - } /* EatComment */ - -/***************************************************************************** - * Scan backards within a string to discover if the last non-whitespace - * character is a line-continuation character ('\\'). - * - * Input: line - A pointer to a buffer containing the string to be - * scanned. - * pos - This is taken to be the offset of the end of the - * string. This position is *not* scanned. - * - * Output: The offset of the '\\' character if it was found, or -1 to - * indicate that it was not. - * - *****************************************************************************/ - -static int Continuation(char *line, int pos ) -{ - pos--; - while( (pos >= 0) && isspace((int)line[pos])) - pos--; - - return (((pos >= 0) && ('\\' == line[pos])) ? pos : -1 ); -} - - -static bool Section( myFILE *InFile, bool (*sfunc)(const char *, void *), void *userdata ) - /* ------------------------------------------------------------------------ ** - * Scan a section name, and pass the name to function sfunc(). - * - * Input: InFile - Input source. - * sfunc - Pointer to the function to be called if the section - * name is successfully read. - * - * Output: true if the section name was read and true was returned from - * <sfunc>. false if <sfunc> failed or if a lexical error was - * encountered. - * - * ------------------------------------------------------------------------ ** - */ - { - int c; - int i; - int end; - const char *func = "params.c:Section() -"; - - i = 0; /* <i> is the offset of the next free byte in bufr[] and */ - end = 0; /* <end> is the current "end of string" offset. In most */ - /* cases these will be the same, but if the last */ - /* character written to bufr[] is a space, then <end> */ - /* will be one less than <i>. */ - - c = EatWhitespace( InFile ); /* We've already got the '['. Scan */ - /* past initial white space. */ - - while( (EOF != c) && (c > 0) ) - { - - /* Check that the buffer is big enough for the next character. */ - if( i > (InFile->bSize - 2) ) - { - char *tb; - - tb = talloc_realloc(InFile, InFile->bufr, char, InFile->bSize + BUFR_INC); - if( NULL == tb ) - { - DEBUG(0, ("%s Memory re-allocation failure.", func) ); - return( false ); - } - InFile->bufr = tb; - InFile->bSize += BUFR_INC; - } - - /* Handle a single character. */ - switch( c ) - { - case ']': /* Found the closing bracket. */ - InFile->bufr[end] = '\0'; - if( 0 == end ) /* Don't allow an empty name. */ - { - DEBUG(0, ("%s Empty section name in configuration file.\n", func )); - return( false ); - } - if( !sfunc(InFile->bufr,userdata) ) /* Got a valid name. Deal with it. */ - return( false ); - (void)EatComment( InFile ); /* Finish off the line. */ - return( true ); - - case '\n': /* Got newline before closing ']'. */ - i = Continuation( InFile->bufr, i ); /* Check for line continuation. */ - if( i < 0 ) - { - InFile->bufr[end] = '\0'; - DEBUG(0, ("%s Badly formed line in configuration file: %s\n", - func, InFile->bufr )); - return( false ); - } - end = ( (i > 0) && (' ' == InFile->bufr[i - 1]) ) ? (i - 1) : (i); - c = mygetc( InFile ); /* Continue with next line. */ - break; - - default: /* All else are a valid name chars. */ - if( isspace( c ) ) /* One space per whitespace region. */ - { - InFile->bufr[end] = ' '; - i = end + 1; - c = EatWhitespace( InFile ); - } - else /* All others copy verbatim. */ - { - InFile->bufr[i++] = c; - end = i; - c = mygetc( InFile ); - } - } - } - - /* We arrive here if we've met the EOF before the closing bracket. */ - DEBUG(0, ("%s Unexpected EOF in the configuration file\n", func)); - return( false ); - } /* Section */ - -static bool Parameter( myFILE *InFile, bool (*pfunc)(const char *, const char *, void *), int c, void *userdata ) - /* ------------------------------------------------------------------------ ** - * Scan a parameter name and value, and pass these two fields to pfunc(). - * - * Input: InFile - The input source. - * pfunc - A pointer to the function that will be called to - * process the parameter, once it has been scanned. - * c - The first character of the parameter name, which - * would have been read by Parse(). Unlike a comment - * line or a section header, there is no lead-in - * character that can be discarded. - * - * Output: true if the parameter name and value were scanned and processed - * successfully, else false. - * - * Notes: This function is in two parts. The first loop scans the - * parameter name. Internal whitespace is compressed, and an - * equal sign (=) terminates the token. Leading and trailing - * whitespace is discarded. The second loop scans the parameter - * value. When both have been successfully identified, they are - * passed to pfunc() for processing. - * - * ------------------------------------------------------------------------ ** - */ - { - int i = 0; /* Position within bufr. */ - int end = 0; /* bufr[end] is current end-of-string. */ - int vstart = 0; /* Starting position of the parameter value. */ - const char *func = "params.c:Parameter() -"; - - /* Read the parameter name. */ - while( 0 == vstart ) /* Loop until we've found the start of the value. */ - { - - if( i > (InFile->bSize - 2) ) /* Ensure there's space for next char. */ - { - char *tb; - - tb = talloc_realloc(InFile, InFile->bufr, char, InFile->bSize + BUFR_INC ); - if( NULL == tb ) - { - DEBUG(0, ("%s Memory re-allocation failure.", func) ); - return( false ); - } - InFile->bufr = tb; - InFile->bSize += BUFR_INC; - } - - switch( c ) - { - case '=': /* Equal sign marks end of param name. */ - if( 0 == end ) /* Don't allow an empty name. */ - { - DEBUG(0, ("%s Invalid parameter name in config. file.\n", func )); - return( false ); - } - InFile->bufr[end++] = '\0'; /* Mark end of string & advance. */ - i = end; /* New string starts here. */ - vstart = end; /* New string is parameter value. */ - InFile->bufr[i] = '\0'; /* New string is nul, for now. */ - break; - - case '\n': /* Find continuation char, else error. */ - i = Continuation( InFile->bufr, i ); - if( i < 0 ) - { - InFile->bufr[end] = '\0'; - DEBUG(1,("%s Ignoring badly formed line in configuration file: %s\n", - func, InFile->bufr )); - return( true ); - } - end = ( (i > 0) && (' ' == InFile->bufr[i - 1]) ) ? (i - 1) : (i); - c = mygetc( InFile ); /* Read past eoln. */ - break; - - case '\0': /* Shouldn't have EOF within param name. */ - case EOF: - InFile->bufr[i] = '\0'; - DEBUG(1,("%s Unexpected end-of-file at: %s\n", func, InFile->bufr )); - return( true ); - - default: - if( isspace( c ) ) /* One ' ' per whitespace region. */ - { - InFile->bufr[end] = ' '; - i = end + 1; - c = EatWhitespace( InFile ); - } - else /* All others verbatim. */ - { - InFile->bufr[i++] = c; - end = i; - c = mygetc( InFile ); - } - } - } - - /* Now parse the value. */ - 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) ); - return( false ); - } - InFile->bufr = tb; - InFile->bSize += BUFR_INC; - } - - switch( c ) - { - case '\r': /* Explicitly remove '\r' because the older */ - c = mygetc( InFile ); /* version called fgets_slash() which also */ - break; /* removes them. */ - - case '\n': /* Marks end of value unless there's a '\'. */ - i = Continuation( InFile->bufr, i ); - if( i < 0 ) - c = 0; - else - { - for( end = i; (end >= 0) && isspace((int)InFile->bufr[end]); end-- ) - ; - c = mygetc( InFile ); - } - break; - - default: /* All others verbatim. Note that spaces do */ - InFile->bufr[i++] = c; /* not advance <end>. This allows trimming */ - if( !isspace( c ) ) /* of whitespace at the end of the line. */ - end = i; - c = mygetc( InFile ); - break; - } - } - InFile->bufr[end] = '\0'; /* End of value. */ - - return( pfunc( InFile->bufr, &InFile->bufr[vstart], userdata ) ); /* Pass name & value to pfunc(). */ - } /* Parameter */ - -static bool Parse( myFILE *InFile, - bool (*sfunc)(const char *, void *), - bool (*pfunc)(const char *, const char *, void *), - void *userdata ) - /* ------------------------------------------------------------------------ ** - * Scan & parse the input. - * - * Input: InFile - Input source. - * sfunc - Function to be called when a section name is scanned. - * See Section(). - * pfunc - Function to be called when a parameter is scanned. - * See Parameter(). - * - * Output: true if the file was successfully scanned, else false. - * - * 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 */ - -/* -------------------------------------------------------------------------- */ |