X-Git-Url: https://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fparams.c;fp=discover%2Fparams.c;h=0000000000000000000000000000000000000000;hp=09c2b0f640a12b6d8c641fb45b64389ae8f83d41;hb=638f16c7683db165154bbe53772c4b864f9dc90d;hpb=6a9c33fe705a479325b47e518f0eedab3239a6b4 diff --git a/discover/params.c b/discover/params.c deleted file mode 100644 index 09c2b0f..0000000 --- a/discover/params.c +++ /dev/null @@ -1,595 +0,0 @@ -/* This modules is based on the params.c module from Samba, written by Karl Auer - and much modifed by Christopher Hertel. */ - -/* - * 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., - * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. - */ - -#include -#include -#include -#include - -#include - -#include "params.h" - -#define new_array(type, num) ((type *)_new_array(sizeof(type), (num))) -#define realloc_array(ptr, type, num) \ - ((type *)_realloc_array((ptr), sizeof(type), (num))) - -#define rprintf(x, ...) do {pb_log(__VA_ARGS__); pb_log("\n");} while (0) -#define rsyserr(x, y, ...) do {pb_log(__VA_ARGS__); pb_log("\n");} while (0) - -#define MALLOC_MAX 0x40000000 -#define False 0 -#define True 1 - -static void *_new_array(unsigned int size, unsigned long num) -{ - if (num >= MALLOC_MAX/size) - return NULL; - return malloc(size * num); -} - -static void *_realloc_array(void *ptr, unsigned int size, unsigned long num) -{ - if (num >= MALLOC_MAX/size) - return NULL; - /* No realloc should need this, but just in case... */ - if (!ptr) - return malloc(size * num); - return realloc(ptr, size * num); -} - - -/* -------------------------------------------------------------------------- ** - * - * 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: - * - * :== {
} EOF - * - *
:==
{ } - * - *
:== '[' NAME ']' - * - * :== 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. - * - * -------------------------------------------------------------------------- ** - */ - -/* -------------------------------------------------------------------------- ** - * Constants... - */ - -#define BUFR_INC 1024 - - -/* -------------------------------------------------------------------------- ** - * Variables... - * - * bufr - pointer to a global buffer. This is probably a kludge, - * but it was the nicest kludge I could think of (for now). - * bSize - The size of the global buffer . - */ - -static char *bufr = NULL; -static int bSize = 0; - -/* -------------------------------------------------------------------------- ** - * Functions... - */ - -static int EatWhitespace( FILE *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 = getc( InFile ); isspace( c ) && ('\n' != c); c = getc( InFile ) ) - ; - return( c ); - } /* EatWhitespace */ - -static int EatComment( FILE *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 = getc( InFile ); ('\n'!=c) && (EOF!=c) && (c>0); c = getc( InFile ) ) - ; - return( c ); - } /* EatComment */ - -static int Continuation( char *line, int pos ) - /* ------------------------------------------------------------------------ ** - * 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. - * - * ------------------------------------------------------------------------ ** - */ - { - pos--; - while( (pos >= 0) && isspace(((unsigned char *)line)[pos]) ) - pos--; - - return( ((pos >= 0) && ('\\' == line[pos])) ? pos : -1 ); - } /* Continuation */ - - -static BOOL Section( FILE *InFile, BOOL (*sfunc)(char *) ) - /* ------------------------------------------------------------------------ ** - * 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 - * . False if failed or if a lexical error was - * encountered. - * - * ------------------------------------------------------------------------ ** - */ - { - int c; - int i; - int end; - char *func = "params.c:Section() -"; - - i = 0; /* is the offset of the next free byte in bufr[] and */ - end = 0; /* 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 */ - /* will be one less than . */ - - 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 > (bSize - 2) ) - { - bSize += BUFR_INC; - bufr = realloc_array( bufr, char, bSize ); - if( NULL == bufr ) - { - rprintf(FERROR, "%s Memory re-allocation failure.", func); - return( False ); - } - } - - /* Handle a single character. */ - switch( c ) - { - case ']': /* Found the closing bracket. */ - bufr[end] = '\0'; - if( 0 == end ) /* Don't allow an empty name. */ - { - rprintf(FERROR, "%s Empty section name in configuration file.\n", func ); - return( False ); - } - if( !sfunc( bufr ) ) /* 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( bufr, i ); /* Check for line continuation. */ - if( i < 0 ) - { - bufr[end] = '\0'; - rprintf(FERROR, "%s Badly formed line in configuration file: %s\n", - func, bufr ); - return( False ); - } - end = ( (i > 0) && (' ' == bufr[i - 1]) ) ? (i - 1) : (i); - c = getc( InFile ); /* Continue with next line. */ - break; - - default: /* All else are a valid name chars. */ - if( isspace( c ) ) /* One space per whitespace region. */ - { - bufr[end] = ' '; - i = end + 1; - c = EatWhitespace( InFile ); - } - else /* All others copy verbatim. */ - { - bufr[i++] = c; - end = i; - c = getc( InFile ); - } - } - } - - /* We arrive here if we've met the EOF before the closing bracket. */ - rprintf(FERROR, "%s Unexpected EOF in the configuration file: %s\n", func, bufr ); - return( False ); - } /* Section */ - -static BOOL Parameter( FILE *InFile, BOOL (*pfunc)(char *, char *), int c ) - /* ------------------------------------------------------------------------ ** - * 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. */ - char *func = "params.c:Parameter() -"; - - /* Read the parameter name. */ - while( 0 == vstart ) /* Loop until we've found the start of the value. */ - { - - if( i > (bSize - 2) ) /* Ensure there's space for next char. */ - { - bSize += BUFR_INC; - bufr = realloc_array( bufr, char, bSize ); - if( NULL == bufr ) - { - rprintf(FERROR, "%s Memory re-allocation failure.", func) ; - return( False ); - } - } - - switch( c ) - { - case '=': /* Equal sign marks end of param name. */ - if( 0 == end ) /* Don't allow an empty name. */ - { - rprintf(FERROR, "%s Invalid parameter name in config. file.\n", func ); - return( False ); - } - bufr[end++] = '\0'; /* Mark end of string & advance. */ - i = end; /* New string starts here. */ - vstart = end; /* New string is parameter value. */ - bufr[i] = '\0'; /* New string is nul, for now. */ - break; - - case '\n': /* Find continuation char, else error. */ - i = Continuation( bufr, i ); - if( i < 0 ) - { - bufr[end] = '\0'; - rprintf(FERROR, "%s Ignoring badly formed line in configuration file: %s\n", - func, bufr ); - return( True ); - } - end = ( (i > 0) && (' ' == bufr[i - 1]) ) ? (i - 1) : (i); - c = getc( InFile ); /* Read past eoln. */ - break; - - case '\0': /* Shouldn't have EOF within param name. */ - case EOF: - bufr[i] = '\0'; - rprintf(FERROR, "%s Unexpected end-of-file at: %s\n", func, bufr ); - return( True ); - - default: - if( isspace( c ) ) /* One ' ' per whitespace region. */ - { - bufr[end] = ' '; - i = end + 1; - c = EatWhitespace( InFile ); - } - else /* All others verbatim. */ - { - bufr[i++] = c; - end = i; - c = getc( InFile ); - } - } - } - - /* Now parse the value. */ - c = EatWhitespace( InFile ); /* Again, trim leading whitespace. */ - while( (EOF !=c) && (c > 0) ) - { - - if( i > (bSize - 2) ) /* Make sure there's enough room. */ - { - bSize += BUFR_INC; - bufr = realloc_array( bufr, char, bSize ); - if( NULL == bufr ) - { - rprintf(FERROR, "%s Memory re-allocation failure.", func) ; - return( False ); - } - } - - switch( c ) - { - case '\r': /* Explicitly remove '\r' because the older */ - c = getc( InFile ); /* version called fgets_slash() which also */ - break; /* removes them. */ - - case '\n': /* Marks end of value unless there's a '\'. */ - i = Continuation( bufr, i ); - if( i < 0 ) - c = 0; - else - { - for( end = i; (end >= 0) && isspace(((unsigned char *) bufr)[end]); end-- ) - ; - c = getc( InFile ); - } - break; - - default: /* All others verbatim. Note that spaces do */ - bufr[i++] = c; /* not advance . This allows trimming */ - if( !isspace( c ) ) /* of whitespace at the end of the line. */ - end = i; - c = getc( InFile ); - break; - } - } - bufr[end] = '\0'; /* End of value. */ - - return( pfunc( bufr, &bufr[vstart] ) ); /* Pass name & value to pfunc(). */ - } /* Parameter */ - -static BOOL Parse( FILE *InFile, - BOOL (*sfunc)(char *), - BOOL (*pfunc)(char *, char *) ) - /* ------------------------------------------------------------------------ ** - * 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 (!sfunc) return True; - if( !Section( InFile, sfunc ) ) - return( False ); - c = EatWhitespace( InFile ); - break; - - case '\\': /* Bogus backslash. */ - c = EatWhitespace( InFile ); - break; - - default: /* Parameter line. */ - if( !Parameter( InFile, pfunc, c ) ) - return( False ); - c = EatWhitespace( InFile ); - break; - } - } - return( True ); - } /* Parse */ - -static FILE *OpenConfFile( char *FileName ) - /* ------------------------------------------------------------------------ ** - * Open a configuration file. - * - * Input: FileName - The pathname of the config file to be opened. - * - * Output: A pointer of type (FILE *) to the opened file, or NULL if the - * file could not be opened. - * - * ------------------------------------------------------------------------ ** - */ - { - FILE *OpenedFile; - char *func = "params.c:OpenConfFile() -"; - - if( NULL == FileName || 0 == *FileName ) - { - rprintf(FERROR,"%s No configuration filename specified.\n", func); - return( NULL ); - } - - OpenedFile = fopen( FileName, "r" ); - if( NULL == OpenedFile ) - { - rsyserr(FERROR, errno, "unable to open configuration file \"%s\"", - FileName); - } - - return( OpenedFile ); - } /* OpenConfFile */ - -BOOL pm_process( char *FileName, - BOOL (*sfunc)(char *), - BOOL (*pfunc)(char *, char *) ) - /* ------------------------------------------------------------------------ ** - * 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; - FILE *InFile; - char *func = "params.c:pm_process() -"; - - InFile = OpenConfFile( FileName ); /* Open the config file. */ - if( NULL == InFile ) - return( False ); - - if( NULL != bufr ) /* If we already have a buffer */ - result = Parse( InFile, sfunc, pfunc ); /* (recursive call), then just */ - /* use it. */ - - else /* If we don't have a buffer */ - { /* allocate one, then parse, */ - bSize = BUFR_INC; /* then free. */ - bufr = new_array( char, bSize ); - if( NULL == bufr ) - { - rprintf(FERROR,"%s memory allocation failure.\n", func); - fclose(InFile); - return( False ); - } - result = Parse( InFile, sfunc, pfunc ); - free( bufr ); - bufr = NULL; - bSize = 0; - } - - fclose(InFile); - - if( !result ) /* Generic failure. */ - { - rprintf(FERROR,"%s Failed. Error returned from params.c:parse().\n", func); - return( False ); - } - - return( True ); /* Generic success. */ - } /* pm_process */ - -/* -------------------------------------------------------------------------- */ -