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//
// "$Id: filename_expand.cxx,v 1.3 1998/10/21 14:20:39 mike Exp $"
//
// Filename expansion routines for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@easysw.com".
//
/* expand a file name by substuting environment variables and
home directories. Returns true if any changes were made.
to & from may be the same buffer.
*/
#include <FL/filename.H>
#include <stdlib.h>
#include <string.h>
#ifdef WIN32
#else
# include <unistd.h>
# include <pwd.h>
#endif
#if defined(WIN32) || defined(__EMX__)
static inline int isdirsep(char c) {return c=='/' || c=='\\';}
#else
#define isdirsep(c) ((c)=='/')
#endif
int filename_expand(char *to,const char *from) {
char temp[FL_PATH_MAX];
strcpy(temp,from);
const char *start = temp;
const char *end = temp+strlen(temp);
int ret = 0;
for (char *a=temp; a<end; ) { // for each slash component
char *e; for (e=a; e<end && !isdirsep(*e); e++); // find next slash
const char *value = 0; // this will point at substitute value
switch (*a) {
case '~': // a home directory name
if (e <= a+1) { // current user's directory
value = getenv("HOME");
#ifndef WIN32
} else { // another user's directory
struct passwd *pwd;
char t = *e; *(char *)e = 0;
pwd = getpwnam(a+1);
*(char *)e = t;
if (pwd) value = pwd->pw_dir;
#endif
}
break;
case '$': /* an environment variable */
{char t = *e; *(char *)e = 0; value = getenv(a+1); *(char *)e = t;}
break;
}
if (value) {
// substitutions that start with slash delete everything before them:
if (isdirsep(value[0])) start = a;
#if defined(WIN32) || defined(__EMX__)
// also if it starts with "A:"
if (value[0] && value[1]==':') start = a;
#endif
int t = strlen(value); if (isdirsep(value[t-1])) t--;
memmove(a+t, e, end+1-e);
end = a+t+(end-e);
memcpy(a, value, t);
ret++;
} else {
a = e+1;
#if defined(WIN32) || defined(__EMX__)
if (*e == '\\') {*e = '/'; ret++;} // ha ha!
#endif
}
}
strcpy(to,start);
return ret;
}
//
// End of "$Id: filename_expand.cxx,v 1.3 1998/10/21 14:20:39 mike Exp $".
//
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