DP: Robert's mistake with incorrect var name corrected.

[wxWidgets.git] / src / iodbc / misc.c

/** miscellaneous functions
       
    Copyright (C) 1995 by Ke Jin <kejin@empress.com> 

    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.
**/

#include	<../iodbc/iodbc.h>

#include	<../iodbc/isql.h>
#include	<../iodbc/isqlext.h>

#include	<stdio.h>
#include        <strings.h>

static int	
upper_strneq( 
	char*	s1,
	char*	s2,
	int	n )
{
	int	i; 
	char	c1 = 0, c2 = 0;

	for(i=1;i<n;i++)
	{
		c1 = s1[i];
		c2 = s2[i];

		if( c1 >= 'a' && c1 <= 'z' )
		{
			c1 += ('A' - 'a');
		}
		else if( c1 == '\n' )
		{
			c1 = '\0';
		}

		if( c2 >= 'a' && c2 <= 'z' )
		{
			c2 += ('A' - 'a');
		}
		else if( c2 == '\n' )
		{
			c2 = '\0';
		}

		if( (c1 - c2) || !c1 || !c2 )
		{
			break;
		}
	}

	return (int)!(c1 - c2);
}

static char*			/* return new position in input str */
readtoken( 
	char* 	istr, 		/* old position in input buf */
	char* 	obuf )		/* token string ( if "\0", then finished ) */
{
	for(; *istr && *istr != '\n' ; istr ++ )
	{
		char c, nx;

		c = *(istr);

		if( c == ' ' || c == '\t' )
		{
			continue;
		}

		nx = *(istr + 1);

		*obuf = c;
		obuf ++;

		if( c == ';' || c == '=' )
		{
			istr ++;
			break;
		}

		if( nx == ' ' || nx == '\t' || nx == ';' || nx == '=' )
		{
			istr ++;
			break;
		}
	}

	*obuf = '\0'; 

	return istr;
}

#if	!defined(WINDOWS) && !defined(WIN32) && !defined(OS2)
# include	<pwd.h>
# define	UNIX_PWD
#endif

static char*
getinitfile(char* buf, int size)	
{
	int	/* i, */ j;
	char*	ptr;

	j = STRLEN("/odbc.ini") + 1;

	if( size < j )
	{
		return NULL;
	}

#if	!defined(UNIX_PWD)
	
	i = GetWindowsDirectory((LPSTR)buf, size );

	if( i == 0 || i > size - j )
	{
		return NULL;
	}

	sprintf( buf + i, "/odbc.ini");

	return buf;
#else
	ptr = (char*)getpwuid(getuid());	

	if( ptr == NULL )
	{
		return NULL;
	}

	ptr = ((struct passwd*)ptr)->pw_dir;

	if( ptr == NULL || *ptr == '\0' )
	{
		ptr = "/home";
	}

	if( size < STRLEN(ptr) + j )
	{
		return NULL;
	}

	sprintf( buf, "%s%s", ptr, "/.odbc.ini");
	/* i.e. searching ~/.odbc.ini */ 
#endif

	return buf;
}

char*	_iodbcdm_getkeyvalbydsn(
		char* 	dsn,		
		int   	dsnlen,	
		char*	keywd, 
		char*	value, 
		int	size )
/* read odbc init file to resolve the value of specified
 * key from named or defaulted dsn section 
 */
{
	char	buf[1024];
	char	dsntk[SQL_MAX_DSN_LENGTH + 3] = { '[', '\0'  };
	char	token[1024];	/* large enough */
	FILE*	file;
	char	pathbuf[1024];
	char*	path;

#define DSN_NOMATCH	0	
#define DSN_NAMED	1
#define DSN_DEFAULT	2

	int	dsnid = DSN_NOMATCH;
	int	defaultdsn = DSN_NOMATCH;

	if( dsn == NULL || *dsn == 0 )
	{
		dsn = "default";
		dsnlen = STRLEN(dsn);
	}

	if( dsnlen == SQL_NTS )
	{
		dsnlen = STRLEN(dsn);
	}

	if( dsnlen <= 0 || keywd == NULL || buf == 0 || size <= 0 )
	{
		return NULL;
	}

	if( dsnlen > sizeof(dsntk) - 2  )
	{
		return NULL;
	}

	value[0] = '\0';

	STRNCAT( dsntk, dsn, dsnlen );
	STRCAT( dsntk, "]" );

	dsnlen = dsnlen + 2;

	path = getinitfile(pathbuf, sizeof(pathbuf));

	if( path == NULL )
	{
		return NULL;
	}

	file = (FILE*)fopen(path, "r");

	if( file == NULL )
	{
		return NULL;
	}

	for(;;)
	{
		char*	str;

		str = fgets(buf, sizeof(buf), file);

		if( str == NULL )
		{
			break;
		}

		if( *str == '[' )
		{
			if( upper_strneq(str, "[default]", STRLEN("[default]")) )
			{
				/* we only read first dsn default dsn
				 * section (as well as named dsn).
				 */
				if( defaultdsn == DSN_NOMATCH )
				{
					dsnid = DSN_DEFAULT;
					defaultdsn = DSN_DEFAULT;
				}
				else
				{
					dsnid = DSN_NOMATCH;
				}

				continue;
			}
			else if( upper_strneq( str, dsntk, dsnlen ) )
			{
				dsnid = DSN_NAMED;
			}
			else
			{
				dsnid = DSN_NOMATCH;
			}

			continue;
		}
		else if( dsnid == DSN_NOMATCH )
		{
			continue;
		}

		str = readtoken(str, token);

		if( upper_strneq( keywd, token, STRLEN(keywd)) )
		{
			str = readtoken(str, token);

			if( ! STREQ( token, "=") )
			/* something other than = */
			{
				continue;
			}

			str = readtoken(str, token);

			if( STRLEN(token) > size - 1)
			{
				break;
			}

			STRNCPY(value, token, size);
			/* copy the value(i.e. next token) to buf */

			if( dsnid != DSN_DEFAULT )
			{
				break;
			}
		}
	}

	fclose(file);

	return (*value)? value:NULL;
}

char*	_iodbcdm_getkeyvalinstr( 
		char*	cnstr, 
		int 	cnlen, 
		char* 	keywd,
		char*	value,
		int	size )
{
	char	token[1024] = { '\0' };
	int	flag = 0;

	if( cnstr == NULL || value == NULL
	 || keywd == NULL || size < 1 )
	{
		return NULL;
	}

	if( cnlen == SQL_NTS )
	{
		cnlen = STRLEN (cnstr);
	}

	if( cnlen <= 0 )
	{
		return NULL;
	}

	for(;;)
	{
		cnstr = readtoken(cnstr, token);

		if( *token == '\0' )
		{
			break;
		}

		if( STREQ( token, ";" ) )
		{
			flag = 0; 
			continue;
		}

		switch(flag)
		{
			case 0:
				if( upper_strneq(token, keywd, strlen(keywd)) )
				{
					flag = 1;
				}
				break;

			case 1:
				if( STREQ( token, "=" ) )
				{
					flag = 2;
				}
				break;

			case 2:
				if( size < strlen(token) + 1 )
				{
					return NULL;
				}

				STRNCPY( value, token, size );

				return value;

			default:
				break;
		}
	}

	return  NULL;
}