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/*
* mono-path.c: Routines for handling path names.
*
* Authors:
* Gonzalo Paniagua Javier (gonzalo@novell.com)
* Miguel de Icaza (miguel@novell.com)
*
* (C) 2006 Novell, Inc. http://www.novell.com
*
*/
#include <config.h>
#include <glib.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
/* This is only needed for the mono_path_canonicalize code, MAXSYMLINKS, could be moved */
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include "mono-path.h"
/* Embedded systems lack MAXSYMLINKS */
#ifndef MAXSYMLINKS
#define MAXSYMLINKS 3
#endif
/* Resolves '..' and '.' references in a path. If the path provided is relative,
* it will be relative to the current directory */
gchar *
mono_path_canonicalize (const char *path)
{
gchar *abspath, *pos, *lastpos, *dest;
int backc;
if (g_path_is_absolute (path)) {
abspath = g_strdup (path);
} else {
gchar *tmpdir = g_get_current_dir ();
abspath = g_build_filename (tmpdir, path, NULL);
g_free (tmpdir);
}
#ifdef PLATFORM_WIN32
g_strdelimit (abspath, "/", '\\');
#endif
abspath = g_strreverse (abspath);
backc = 0;
dest = lastpos = abspath;
pos = strchr (lastpos, G_DIR_SEPARATOR);
while (pos != NULL) {
int len = pos - lastpos;
if (len == 1 && lastpos [0] == '.') {
// nop
} else if (len == 2 && lastpos [0] == '.' && lastpos [1] == '.') {
backc++;
} else if (len > 0) {
if (backc > 0) {
backc--;
} else {
if (dest != lastpos)
/* The two strings can overlap */
memmove (dest, lastpos, len + 1);
dest += len + 1;
}
}
lastpos = pos + 1;
pos = strchr (lastpos, G_DIR_SEPARATOR);
}
#ifdef PLATFORM_WIN32 /* For UNC paths the first '\' is removed. */
if (*(lastpos-1) == G_DIR_SEPARATOR && *(lastpos-2) == G_DIR_SEPARATOR)
lastpos = lastpos-1;
#endif
if (dest != lastpos) strcpy (dest, lastpos);
return g_strreverse (abspath);
}
/*
* This ensures that the path that we store points to the final file
* not a path to a symlink.
*/
#if !defined(PLATFORM_NO_SYMLINKS)
static gchar *
resolve_symlink (const char *path)
{
char *p, *concat, *dir;
char buffer [PATH_MAX+1];
int n, iterations = 0;
p = g_strdup (path);
do {
iterations++;
n = readlink (p, buffer, sizeof (buffer)-1);
if (n < 0){
char *copy = p;
p = mono_path_canonicalize (copy);
g_free (copy);
return p;
}
buffer [n] = 0;
if (!g_path_is_absolute (buffer)) {
dir = g_path_get_dirname (p);
concat = g_build_filename (dir, buffer, NULL);
g_free (dir);
} else {
concat = g_strdup (buffer);
}
g_free (p);
p = mono_path_canonicalize (concat);
g_free (concat);
} while (iterations < MAXSYMLINKS);
return p;
}
#endif
gchar *
mono_path_resolve_symlinks (const char *path)
{
#if defined(PLATFORM_NO_SYMLINKS)
return mono_path_canonicalize (path);
#else
gchar **split = g_strsplit (path, G_DIR_SEPARATOR_S, -1);
gchar *p = g_strdup ("");
int i;
for (i = 0; split [i] != NULL; i++) {
gchar *tmp = NULL;
// resolve_symlink of "" goes into canonicalize which resolves to cwd
if (strcmp (split [i], "") != 0) {
tmp = g_strdup_printf ("%s%s", p, split [i]);
g_free (p);
p = resolve_symlink (tmp);
g_free (tmp);
}
if (split [i+1] != NULL) {
tmp = g_strdup_printf ("%s%s", p, G_DIR_SEPARATOR_S);
g_free (p);
p = tmp;
}
}
g_free (split);
return p;
#endif
}
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