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/*
* ========================================================================
* Copyright 2013-2021 Eduardo Chappa
* Copyright 2006-2008 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* ========================================================================
*/
#include <system.h>
#if STDC_HEADERS
#include <ctype.h>
#endif
#include "bldpath.h"
/*
* Useful definitions
*/
#ifdef _WINDOWS
#define ROOTED(S) (*(S) == '\\' || (isalpha((unsigned char) (S)[0]) && (S)[1] == ':'))
#define HOMERELATIVE(S) (FALSE)
#else /* UNIX */
#define ROOTED(S) (*(S) == '/')
#define HOMERELATIVE(S) (*(S) == '~')
#endif
/*----------------------------------------------------------------------
Paste together two pieces of a file name path
Args: pathbuf -- Put the result here
first_part -- of path name
second_part -- of path name
len -- Length of pathbuf
Result: New path is in pathbuf. Note that
we don't have to check for /'s at end of first_part and beginning
of second_part since multiple slashes are ok.
BUGS: This is a first stab at dealing with fs naming dependencies, and others
still exist.
----*/
void
build_path(char *pathbuf, char *first_part, char *second_part, size_t len)
{
if(!(pathbuf && len > 0))
return;
pathbuf[0] = '\0';
if(!first_part || is_rooted_path(second_part)){
if(second_part)
strncpy(pathbuf, second_part, len-1);
pathbuf[len-1] = '\0';
}
else{
#ifdef _WINDOWS
int i;
char *orig_pathbuf = pathbuf;
for(i = 0; i < len-2 && first_part[i]; i++)
*pathbuf++ = first_part[i];
if(second_part){
if(i && first_part[i-1] == '\\'){ /* first part ended with \ */
if(*second_part == '\\') /* and second starts with \ */
second_part++; /* else just append second */
}
else if(*second_part != '\\') /* no slash at all, so */
*pathbuf++ = '\\'; /* insert one... */
while(pathbuf-orig_pathbuf < len-1 && *second_part)
*pathbuf++ = *second_part++;
}
*pathbuf = '\0';
#else /* UNIX */
size_t fpl = 0;
strncpy(pathbuf, first_part, len-2);
pathbuf[len-2] = '\0';
if(second_part){
if(*pathbuf && pathbuf[(fpl=strlen(pathbuf))-1] != '/'){
pathbuf[fpl++] = '/';
pathbuf[fpl] = '\0';
}
strncat(pathbuf, second_part, len-1-strlen(pathbuf));
}
pathbuf[len-1] = '\0';
#endif
}
}
/*----------------------------------------------------------------------
Test to see if the given file path is absolute
Args: file -- file path to test
Result: TRUE if absolute, FALSE otw
----*/
int
is_absolute_path(char *path)
{
return(path && (ROOTED(path) || HOMERELATIVE(path)));
}
/*
* homedir_in_path - return pointer to point in path string where home dir
* reference starts
*/
int
is_rooted_path(char *path)
{
return(path && ROOTED(path));
}
/*
* homedir_in_path - return pointer to point in path string where home dir
* reference starts
*/
int
is_homedir_path(char *path)
{
return(path && HOMERELATIVE(path));
}
/*
* homedir_in_path - return pointer to point in path string where home dir
* reference starts
*/
char *
homedir_in_path(char *path)
{
#ifdef _WINDOWS
return(NULL);
#else /* UNIX */
char *p;
return((p = strchr(path, '~')) ? p : NULL);
#endif
}
/*
*
*/
char *
filename_parent_ref(char *s)
{
#ifdef _WINDOWS
return(strstr(s, "\\..\\"));
#else /* UNIX */
return(strstr(s, "/../"));
#endif
}
int
filename_is_restricted(char *s)
{
#ifdef _WINDOWS
return(filename_parent_ref(s) != NULL);
#else /* UNIX */
return(strchr("./~", s[0]) != NULL || filename_parent_ref(s) != NULL);
#endif
}
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