8809c5d65d
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9325 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
126 lines
3.5 KiB
C++
126 lines
3.5 KiB
C++
//
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// "$Id$"
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//
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// Filename expansion routines for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2010 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// http://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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/* expand a file name by substuting environment variables and
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home directories. Returns true if any changes were made.
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to & from may be the same buffer.
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*/
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#include <FL/filename.H>
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#include <FL/fl_utf8.h>
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#include <stdlib.h>
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#include "flstring.h"
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#if defined(WIN32) && !defined(__CYGWIN__)
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#include <windows.h>
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#else
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# include <unistd.h>
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# include <pwd.h>
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#endif
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#if defined(WIN32) || defined(__EMX__) && !defined(__CYGWIN__)
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static inline int isdirsep(char c) {return c=='/' || c=='\\';}
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#else
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#define isdirsep(c) ((c)=='/')
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#endif
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/** Expands a filename containing shell variables and tilde (~).
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Currently handles these variants:
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\code
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"~username" // if 'username' does not exist, result will be unchanged
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"~/file"
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"$VARNAME" // does NOT handle ${VARNAME}
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\endcode
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\b Examples:
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\code
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#include <FL/filename.H>
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[..]
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putenv("TMPDIR=/var/tmp");
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fl_filename_expand(out, sizeof(out), "~fred/.cshrc"); // out="/usr/fred/.cshrc"
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fl_filename_expand(out, sizeof(out), "~/.cshrc"); // out="/usr/<yourname>/.cshrc"
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fl_filename_expand(out, sizeof(out), "$TMPDIR/foo.txt"); // out="/var/tmp/foo.txt"
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\endcode
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\param[out] to resulting expanded filename
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\param[in] tolen size of the expanded filename buffer
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\param[in] from filename containing shell variables
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\return 0 if no change, non zero otherwise
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*/
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int fl_filename_expand(char *to,int tolen, const char *from) {
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char *temp = new char[tolen];
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strlcpy(temp,from, tolen);
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char *start = temp;
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char *end = temp+strlen(temp);
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int ret = 0;
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for (char *a=temp; a<end; ) { // for each slash component
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char *e; for (e=a; e<end && !isdirsep(*e); e++); // find next slash
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const char *value = 0; // this will point at substitute value
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switch (*a) {
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case '~': // a home directory name
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if (e <= a+1) { // current user's directory
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value = fl_getenv("HOME");
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#ifndef WIN32
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} else { // another user's directory
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struct passwd *pwd;
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char t = *e; *(char *)e = 0;
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pwd = getpwnam(a+1);
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*(char *)e = t;
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if (pwd) value = pwd->pw_dir;
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#endif
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}
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break;
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case '$': /* an environment variable */
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{char t = *e; *(char *)e = 0; value = fl_getenv(a+1); *(char *)e = t;}
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break;
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}
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if (value) {
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// substitutions that start with slash delete everything before them:
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if (isdirsep(value[0])) start = a;
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#if defined(WIN32) || defined(__EMX__) && !defined(__CYGWIN__)
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// also if it starts with "A:"
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if (value[0] && value[1]==':') start = a;
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#endif
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int t = (int) strlen(value); if (isdirsep(value[t-1])) t--;
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if ((end+1-e+t) >= tolen) end += tolen - (end+1-e+t);
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memmove(a+t, e, end+1-e);
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end = a+t+(end-e);
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*end = '\0';
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memcpy(a, value, t);
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ret++;
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} else {
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a = e+1;
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#if defined(WIN32) || defined(__EMX__) && !defined(__CYGWIN__)
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if (*e == '\\') {*e = '/'; ret++;} // ha ha!
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#endif
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}
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}
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strlcpy(to, start, tolen);
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delete[] temp;
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return ret;
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}
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//
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// End of "$Id$".
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//
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