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/*
** VFNAME.C
*/
#include <stdio.h>
#include <string.h>
#include <conio.h>
#ifdef TRUE
#undef TRUE
#endif
#ifdef FALSE
#undef FALSE
#endif
#ifdef ERROR
#undef ERROR
#endif
enum LOGICAL {ERROR = -1, SUCCESS, FALSE = 0, TRUE};
#if defined(__TURBOC__)
#include <dir.h>
#endif
#if !defined( MAXFILE )
#define MAXFILE 9
#endif
#define NUL '\0'
/*
** Prototypes
*/
int valid_fname (char *fname, int wild_check);
/*
** valid_fname.c
**
** Verifies whether a filename is valid or invalid without
** altering the passed filename itself.
**
** Note that only filenames are validated. Path and drive specs
** need to be separately validated. See FLN_FIX.C in SNIPPETS.
**
** Arguments: 2 - fname = a char array MAXFILE long
** wild_check: 0 means wildcard use okay
** any other value means test for
** wildcards which are not acceptable
**
** Returns: ERROR - fname is invalid
** SUCCESS - fname is valid
**
** Side effects: none
**
** Speed: 1) Turbo Profiler rates valid_fname at 0.0004 sec/call
** on an Intel 80286.
** 2) Token testing from both ends to center yields a slight
** improvement.
**
** Notes: Space, ASCII character 32, is a special case. Dos will
** write a filename or volume label that includes a space.
** Getting access to that file, afterwards, is not always
** easy :) For my purposes, space is an invalid filename
** token. You? You're on your own :)
**
** Uses strnicmp() and stricmp(), non-ISO/ANSI, but available on
** all DOS C compilers (MSC, BC++, SC++ WC, etc.)
**
** Revisions: 1) Dropped str2upper after comment by David Johnson
** on 07-17-93
** 2) Added [] to token list after comment by Ed
** Kowalski on 07-17-93
** 3) Added lpt1-lpt3, com1-com4 and clock$ to
** invalid name list after comment by Ed
** Kowalski on 07-17-93
** 4) Eliminated double exit points after my own
** comment to Bob Stout :) on 07/22/1993
** 5) Revisions to detect DOS extension errors on 03/13/94
**
** Public domain by Sid Rogers and Bob Stout
**
*/
int valid_fname(char *fname, int wild_check)
{
/* invalid filename tokens */
static char invalid_tokens[] = "\0 ,;:|\\/<>\"+=[]*?";
static int itoklen = sizeof(invalid_tokens) - 1;
/* invalid file names -- even with extension .xxx */
static char *invalid_3lnam[]={"AUX","CON","PRN","NUL","COM",NULL};
/* other invalid file & directory names */
static char *invalid_4lnam[]={"LPT1","LPT2","LPT3","COM1",
"COM2","COM3","COM4",NULL};
static char *invalid_6lnam = "CLOCK$";
int num_toks, fl, i, j, k, proceed = 0;
char *p;
/* Handle the critical stuff first */
for (i = 0; invalid_3lnam[i]; ++i)
{
if (SUCCESS == strnicmp(fname, invalid_3lnam[i], 3))
proceed = ERROR;
}
/* Handle extensions next */
if (ERROR != proceed && NULL != (p = strchr(fname, '.')))
{
if (3 < strlen(p+1) || NULL != strchr(p+1, '.'))
proceed = ERROR;
if (8 < (p - fname))
proceed = ERROR;
}
if (ERROR != proceed)
{
if (p)
*p = NUL;
for (i = 0; invalid_4lnam[i]; ++i)
{
if (SUCCESS == stricmp(fname, invalid_4lnam[i]))
proceed = ERROR;
}
if (SUCCESS == stricmp(fname, invalid_6lnam))
proceed = ERROR;
if (p)
*p = '.';
else if (8 < strlen(fname))
proceed = ERROR;
}
fl = strlen(fname);
/* process filename for invalid tokens */
if (ERROR != proceed)
{
if (wild_check)
num_toks = itoklen; /* wildcards invalid */
else num_toks = itoklen - 2; /* wildcards ok */
for (i = -1, j = 0; i < 0 && j < num_toks; j++)
{
for (k = 0; k < fl; k++)
if(invalid_tokens[j] == fname[k])
i=j;
}
if (i >= 0)
proceed = ERROR;
}
return proceed; /* single exit point */
}
#ifdef TEST
/*
** Revised function test - Performs standard tests and then validates
** filenames passed on the command line.
*/
main(int argc, char *argv[])
{
static char *name_test[]= {"aaa","aux","con","prn","nul","lpt1", "lpt2",
"lpt3","com1","com2","com3", "com4","bbbb",
"clock$","com.c", "cccccc",NULL};
static char *token_test[]={"00fname.","01 fname","02fname,", "03fname[",
"04fname;","05fname:", "06fname|","07fname/",
"08fname<", "09fname>","10fname+","11fname=",
"12fname\\","13fname\"","14fname]",
"15fname*", "16fname?","filename", NULL};
char fname[MAXFILE];
int i;
for (i = 0; name_test[i]; ++i)
{
strcpy(fname,name_test[i]);
printf("%6s is %s\n",fname,
valid_fname(fname,0) ? "INvalid" : "Valid");
}
puts("\nHit a key");
getch();
puts("\n[Wildcards not allowed]\n");
for (i = 0; token_test[i]; ++i)
{
strcpy(fname,token_test[i]);
printf("%s is %s\n",fname,
valid_fname(fname,1) ? "INvalid" : "Valid");
}
puts("\nHit a key");
getch();
puts("\n[Wildcards allowed]\n");
for (i = 0; token_test[i]; ++i)
{
strcpy(fname,token_test[i]);
printf("%s is %s\n",fname,
valid_fname(fname,0) ? "INvalid" : "Valid");
}
puts("\nHit a key");
getch();
while (--argc)
{
strcpy(fname, *(++argv));
printf("%s is %s\n",fname,
valid_fname(fname,1) ? "INvalid" : "Valid");
}
return 0;
}
#endif
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