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CFG.C
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C/C++ Source or Header
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1996-11-24
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129 lines
/* +++Date last modified: 17-Nov-1995 */
/* =======================================================================
CFG.c Generic configuration file handler.
A. Reitsma, Delft, The Netherlands.
v1.00 94-07-09 Public Domain.
---------------------------------------------------------------------- */
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "cfg.h"
#define LINE_LEN_MAX 128 /* actual max line length */
#define BUFFERSIZE LINE_LEN_MAX +2 /* ... including \n and \0 */
enum RetVal
{
NO_PROBLEMS,
ERR_FOPEN,
ERR_MEM,
};
int CfgRead( char * Filename, struct CfgStrings * CfgInfo )
{
char Buffer[ BUFFERSIZE ];
char * WorkPtr ;
char * CfgName ;
char * CfgData ;
struct CfgStrings * Cfg ;
FILE * CfgFile ;
CfgFile = fopen( Filename, "r" );
if( NULL == CfgFile )
{
return ERR_FOPEN ;
}
while( NULL != fgets( Buffer, BUFFERSIZE, CfgFile ))
{
/* clip off optional comment tail indicated by a semi-colon
*/
if( NULL != (WorkPtr = strchr( Buffer, ';' )))
*WorkPtr = '\0';
else
WorkPtr = Buffer + strlen( Buffer );
/* clip off trailing and leading white space
*/
WorkPtr--;
while( isspace( *WorkPtr ) && WorkPtr >= Buffer )
*WorkPtr-- = '\0';
WorkPtr = Buffer;
while( isspace( *WorkPtr ))
WorkPtr++;
if( 0 == strlen( WorkPtr ))
continue;
CfgName = strtok( WorkPtr, " =" );
if( NULL != CfgName )
{
/* Condition the name (lower case required),
and strip leading white and a 'late' = from data part.
*/
strlwr( CfgName );
CfgData = strtok( NULL, "" );
while( isspace( *CfgData ))
CfgData++;
if( '=' == *CfgData )
CfgData++;
while( isspace( *CfgData ))
CfgData++;
/* look for matching 'name'
*/
Cfg = CfgInfo ;
while( NULL != Cfg->name && 0 != strcmp( Cfg->name, CfgName ))
Cfg++;
/* duplicate the data if the name is found.
*/
if( NULL != Cfg->name )
{
Cfg->data = strdup( CfgData ); /* strdup is not ANSI */
/* memory leaks if Cfg->data */
/* is malloc'ed already */
if( NULL == Cfg->data )
{
fclose( CfgFile );
return ERR_MEM;
}
} /* undetected error on failure should not be a problem */
/* as configuration reading should be done early. */
} /* but test and handle it anyway ... */
}
fclose( CfgFile );
return NO_PROBLEMS ;
}
#ifdef TEST
struct CfgStrings CfgDemoData[] =
{
{ "workpath", NULL },
{ "archiver", NULL },
{ "splitter", NULL },
{ NULL, NULL } /* array terminator. REQUIRED !!! */
};
main( int argc, char * argv[] )
{
int ix ;
if( argc > 1 )
CfgRead( argv[ 1 ], CfgDemoData );
else
return ERR_FOPEN ;
printf( "%s\n", argv[ 0 ]);
for( ix = 0; ix < 4 ; ix++ ) /* intentionally one too much */
printf( "CfgItem \"%s\" is \"%s\"\n", CfgDemoData[ ix ].name,
CfgDemoData[ ix ].data );
return NO_PROBLEMS;
}
#endif
/* ==== CFG.c end ===================================================== */