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/*
** FLN_FIX.C
**
** Original Copyright 1988-1991 by Bob Stout as part of
** the MicroFirm Function Library (MFL)
**
** This subset version is functionally identical to the
** version originally published by the author in Tech Specialist
** magazine and is hereby donated to the public domain.
*/
#include <stdio.h>
#include <string.h>
#include <dos.h>
#include <io.h>
#define LAST_CHAR(string) (((char *)string)[strlen(string)-1])
typedef enum {ERROR = -1, FALSE, TRUE} LOGICAL;
char *unix2dos(char *path);
/****************************************************************/
/* */
/* Function to `crunch' dot directories and check for */
/* DOS-valid path strings. Drive specifiers in the path */
/* ignored. */
/* */
/****************************************************************/
char *fln_fix(char *path)
{
LOGICAL dir_flag = FALSE, root_flag = FALSE;
char *r, *p, *q, *s;
if (path)
strupr(path);
/* Ignore leading drive specs */
if (NULL == (r = strrchr(path, ':')))
r = path;
else ++r;
unix2dos(r); /* Convert Unix to DOS style */
while ('\\' == *r) /* Ignore leading backslashes */
{
if ('\\' == r[1])
strcpy(r, &r[1]);
else
{
root_flag = TRUE;
++r;
}
}
p = r; /* Change "\\" to "\" */
while (NULL != (p = strchr(p, '\\')))
{
if ('\\' == p[1])
strcpy(p, &p[1]);
else ++p;
}
while ('.' == *r) /* Scrunch leading ".\" */
{
if ('.' == r[1])
{
/* Ignore leading ".." */
for (p = (r += 2); *p && (*p != '\\'); ++p)
;
}
else
{
for (p = r + 1 ;*p && (*p != '\\'); ++p)
;
}
strcpy(r, p + ((*p) ? 1 : 0));
}
while ('\\' == LAST_CHAR(path)) /* Strip trailing backslash */
{
dir_flag = TRUE;
LAST_CHAR(path) = '\0';
}
s = r;
/* Look for "\." in path */
while (NULL != (p = strstr(s, "\\.")))
{
if ('.' == p[2])
{
/* Execute this section if ".." found */
q = p - 1;
while (q > r) /* Backup one level */
{
if (*q == '\\')
break;
--q;
}
if (q > r)
{
strcpy(q, p + 3);
s = q;
}
else if ('.' != *q)
{
strcpy(q + ((*q == '\\') ? 1 : 0),
p + 3 + ((*(p + 3)) ? 1 : 0));
s = q;
}
else s = ++p;
}
else
{
/* Execute this section if "." found */
q = p + 2;
for ( ;*q && (*q != '\\'); ++q)
;
strcpy (p, q);
}
}
if (root_flag) /* Embedded ".." could have bubbled up to root */
{
for (p = r; *p && ('.' == *p || '\\' == *p); ++p)
;
if (r != p)
strcpy(r, p);
}
if (dir_flag)
strcat(path, "\\");
return path;
}
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