ref: 9eaba52cafcac7c2f3bfc72d7be1f15893196be1
dir: /DoConfig/fltk/src/filename_absolute.cxx/
//
// "$Id$"
//
// Filename expansion routines for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
/* expand a file name by prepending current directory, deleting . and
.. (not really correct for symbolic links) between the prepended
current directory. Use $PWD if it exists.
Returns true if any changes were made.
*/
#include <FL/filename.H>
#include <FL/fl_utf8.h>
#include <stdlib.h>
#include "flstring.h"
#include <ctype.h>
#if defined(WIN32) && !defined(__CYGWIN__)
# include <direct.h>
#else
# include <unistd.h>
#endif
#if defined(WIN32) || defined(__EMX__) && !defined(__CYGWIN__)
inline int isdirsep(char c) {return c=='/' || c=='\\';}
#else
#define isdirsep(c) ((c)=='/')
#endif
/** Makes a filename absolute from a relative filename.
\code
#include <FL/filename.H>
[..]
chdir("/var/tmp");
fl_filename_absolute(out, sizeof(out), "foo.txt"); // out="/var/tmp/foo.txt"
fl_filename_absolute(out, sizeof(out), "./foo.txt"); // out="/var/tmp/foo.txt"
fl_filename_absolute(out, sizeof(out), "../log/messages"); // out="/var/log/messages"
\endcode
\param[out] to resulting absolute filename
\param[in] tolen size of the absolute filename buffer
\param[in] from relative filename
\return 0 if no change, non zero otherwise
*/
int fl_filename_absolute(char *to, int tolen, const char *from) {
if (isdirsep(*from) || *from == '|'
#if defined(WIN32) || defined(__EMX__) && !defined(__CYGWIN__)
|| from[1]==':'
#endif
) {
strlcpy(to, from, tolen);
return 0;
}
char *a;
char *temp = new char[tolen];
const char *start = from;
a = fl_getcwd(temp, tolen);
if (!a) {
strlcpy(to, from, tolen);
delete[] temp;
return 0;
}
#if defined(WIN32) || defined(__EMX__) && !defined(__CYGWIN__)
for (a = temp; *a; a++) if (*a=='\\') *a = '/'; // ha ha
#else
a = temp+strlen(temp);
#endif
if (isdirsep(*(a-1))) a--;
/* remove intermediate . and .. names: */
while (*start == '.') {
if (start[1]=='.' && isdirsep(start[2])) {
char *b;
for (b = a-1; b >= temp && !isdirsep(*b); b--) {/*empty*/}
if (b < temp) break;
a = b;
start += 3;
} else if (isdirsep(start[1])) {
start += 2;
} else if (!start[1]) {
start ++; // Skip lone "."
break;
} else
break;
}
*a++ = '/';
strlcpy(a,start,tolen - (a - temp));
strlcpy(to, temp, tolen);
delete[] temp;
return 1;
}
/** Makes a filename relative to the current working directory.
\code
#include <FL/filename.H>
[..]
chdir("/var/tmp/somedir"); // set cwd to /var/tmp/somedir
[..]
char out[FL_PATH_MAX];
fl_filename_relative(out, sizeof(out), "/var/tmp/somedir/foo.txt"); // out="foo.txt", return=1
fl_filename_relative(out, sizeof(out), "/var/tmp/foo.txt"); // out="../foo.txt", return=1
fl_filename_relative(out, sizeof(out), "foo.txt"); // out="foo.txt", return=0 (no change)
fl_filename_relative(out, sizeof(out), "./foo.txt"); // out="./foo.txt", return=0 (no change)
fl_filename_relative(out, sizeof(out), "../foo.txt"); // out="../foo.txt", return=0 (no change)
\endcode
\param[out] to resulting relative filename
\param[in] tolen size of the relative filename buffer
\param[in] from absolute filename
\return 0 if no change, non zero otherwise
*/
int // O - 0 if no change, 1 if changed
fl_filename_relative(char *to, // O - Relative filename
int tolen, // I - Size of "to" buffer
const char *from) // I - Absolute filename
{
char cwd_buf[FL_PATH_MAX]; // Current directory
// get the current directory and return if we can't
if (!fl_getcwd(cwd_buf, sizeof(cwd_buf))) {
strlcpy(to, from, tolen);
return 0;
}
return fl_filename_relative(to, tolen, from, cwd_buf);
}
/** Makes a filename relative to any other directory.
\param[out] to resulting relative filename
\param[in] tolen size of the relative filename buffer
\param[in] from absolute filename
\param[in] base relative to this absolute path
\return 0 if no change, non zero otherwise
*/
int // O - 0 if no change, 1 if changed
fl_filename_relative(char *to, // O - Relative filename
int tolen, // I - Size of "to" buffer
const char *from, // I - Absolute filename
const char *base) { // I - Find path relative to this path
char *newslash; // Directory separator
const char *slash; // Directory separator
char *cwd = 0L, *cwd_buf = 0L;
if (base) cwd = cwd_buf = strdup(base);
// return if "from" is not an absolute path
#if defined(WIN32) || defined(__EMX__)
if (from[0] == '\0' ||
(!isdirsep(*from) && !isalpha(*from) && from[1] != ':' &&
!isdirsep(from[2]))) {
#else
if (from[0] == '\0' || !isdirsep(*from)) {
#endif // WIN32 || __EMX__
strlcpy(to, from, tolen);
if (cwd_buf) free(cwd_buf);
return 0;
}
// return if "cwd" is not an absolute path
#if defined(WIN32) || defined(__EMX__)
if (!cwd || cwd[0] == '\0' ||
(!isdirsep(*cwd) && !isalpha(*cwd) && cwd[1] != ':' &&
!isdirsep(cwd[2]))) {
#else
if (!cwd || cwd[0] == '\0' || !isdirsep(*cwd)) {
#endif // WIN32 || __EMX__
strlcpy(to, from, tolen);
if (cwd_buf) free(cwd_buf);
return 0;
}
#if defined(WIN32) || defined(__EMX__)
// convert all backslashes into forward slashes
for (newslash = strchr(cwd, '\\'); newslash; newslash = strchr(newslash + 1, '\\'))
*newslash = '/';
// test for the exact same string and return "." if so
if (!strcasecmp(from, cwd)) {
strlcpy(to, ".", tolen);
free(cwd_buf);
return (1);
}
// test for the same drive. Return the absolute path if not
if (tolower(*from & 255) != tolower(*cwd & 255)) {
// Not the same drive...
strlcpy(to, from, tolen);
free(cwd_buf);
return 0;
}
// compare the path name without the drive prefix
from += 2; cwd += 2;
#else
// test for the exact same string and return "." if so
if (!strcmp(from, cwd)) {
strlcpy(to, ".", tolen);
free(cwd_buf);
return (1);
}
#endif // WIN32 || __EMX__
// compare both path names until we find a difference
for (slash = from, newslash = cwd;
*slash != '\0' && *newslash != '\0';
slash ++, newslash ++)
if (isdirsep(*slash) && isdirsep(*newslash)) continue;
#if defined(WIN32) || defined(__EMX__) || defined(__APPLE__)
else if (tolower(*slash & 255) != tolower(*newslash & 255)) break;
#else
else if (*slash != *newslash) break;
#endif // WIN32 || __EMX__ || __APPLE__
// skip over trailing slashes
if ( *newslash == '\0' && *slash != '\0' && !isdirsep(*slash)
&&(newslash==cwd || !isdirsep(newslash[-1])) )
newslash--;
// now go back to the first character of the first differing paths segment
while (!isdirsep(*slash) && slash > from) slash --;
if (isdirsep(*slash)) slash ++;
// do the same for the current dir
if (isdirsep(*newslash)) newslash --;
if (*newslash != '\0')
while (!isdirsep(*newslash) && newslash > cwd) newslash --;
// prepare the destination buffer
to[0] = '\0';
to[tolen - 1] = '\0';
// now add a "previous dir" sequence for every following slash in the cwd
while (*newslash != '\0') {
if (isdirsep(*newslash)) strlcat(to, "../", tolen);
newslash ++;
}
// finally add the differing path from "from"
strlcat(to, slash, tolen);
free(cwd_buf);
return 1;
}
//
// End of "$Id$".
//