#define MAXDEPTH 5
/*
- * Use this to get the real path, i.e. resolve links. If you want an
- * absolute path but don't mind links, use absolute_path.
+ * Return the real path (i.e., absolute path, with symlinks resolved
+ * and extra slashes removed) equivalent to the specified path. (If
+ * you want an absolute path but don't mind links, use
+ * absolute_path().) The return value is a pointer to a static
+ * buffer.
+ *
+ * The input and all intermediate paths must be shorter than MAX_PATH.
+ * The directory part of path (i.e., everything up to the last
+ * dir_sep) must denote a valid, existing directory, but the last
+ * component need not exist. If die_on_error is set, then die with an
+ * informative error message if there is a problem. Otherwise, return
+ * NULL on errors (without generating any output).
*
* If path is our buffer, then return path, as it's already what the
* user wants.
*/
-const char *real_path(const char *path)
+static const char *real_path_internal(const char *path, int die_on_error)
{
- static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1];
- char cwd[1024] = "";
- int buf_index = 1;
+ static struct strbuf sb = STRBUF_INIT;
+ char *retval = NULL;
+
+ /*
+ * If we have to temporarily chdir(), store the original CWD
+ * here so that we can chdir() back to it at the end of the
+ * function:
+ */
+ struct strbuf cwd = STRBUF_INIT;
int depth = MAXDEPTH;
char *last_elem = NULL;
struct stat st;
/* We've already done it */
- if (path == buf || path == next_buf)
+ if (path == sb.buf)
return path;
- if (!*path)
- die("The empty string is not a valid path");
+ if (!*path) {
+ if (die_on_error)
+ die("The empty string is not a valid path");
+ else
+ goto error_out;
+ }
- if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
- die ("Too long path: %.*s", 60, path);
+ strbuf_reset(&sb);
+ strbuf_addstr(&sb, path);
while (depth--) {
- if (!is_directory(buf)) {
- char *last_slash = find_last_dir_sep(buf);
+ if (!is_directory(sb.buf)) {
+ char *last_slash = find_last_dir_sep(sb.buf);
if (last_slash) {
last_elem = xstrdup(last_slash + 1);
- last_slash[1] = '\0';
+ strbuf_setlen(&sb, last_slash - sb.buf + 1);
} else {
- last_elem = xstrdup(buf);
- *buf = '\0';
+ last_elem = xmemdupz(sb.buf, sb.len);
+ strbuf_reset(&sb);
}
}
- if (*buf) {
- if (!*cwd && !getcwd(cwd, sizeof(cwd)))
- die_errno ("Could not get current working directory");
+ if (sb.len) {
+ if (!cwd.len && strbuf_getcwd(&cwd)) {
+ if (die_on_error)
+ die_errno("Could not get current working directory");
+ else
+ goto error_out;
+ }
- if (chdir(buf))
- die_errno ("Could not switch to '%s'", buf);
+ if (chdir(sb.buf)) {
+ if (die_on_error)
+ die_errno("Could not switch to '%s'",
+ sb.buf);
+ else
+ goto error_out;
+ }
+ }
+ if (strbuf_getcwd(&sb)) {
+ if (die_on_error)
+ die_errno("Could not get current working directory");
+ else
+ goto error_out;
}
- if (!getcwd(buf, PATH_MAX))
- die_errno ("Could not get current working directory");
if (last_elem) {
- size_t len = strlen(buf);
- if (len + strlen(last_elem) + 2 > PATH_MAX)
- die ("Too long path name: '%s/%s'",
- buf, last_elem);
- if (len && !is_dir_sep(buf[len-1]))
- buf[len++] = '/';
- strcpy(buf + len, last_elem);
+ if (sb.len && !is_dir_sep(sb.buf[sb.len - 1]))
+ strbuf_addch(&sb, '/');
+ strbuf_addstr(&sb, last_elem);
free(last_elem);
last_elem = NULL;
}
- if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
- ssize_t len = readlink(buf, next_buf, PATH_MAX);
- if (len < 0)
- die_errno ("Invalid symlink '%s'", buf);
- if (PATH_MAX <= len)
- die("symbolic link too long: %s", buf);
- next_buf[len] = '\0';
- buf = next_buf;
- buf_index = 1 - buf_index;
- next_buf = bufs[buf_index];
+ if (!lstat(sb.buf, &st) && S_ISLNK(st.st_mode)) {
+ struct strbuf next_sb = STRBUF_INIT;
+ ssize_t len = strbuf_readlink(&next_sb, sb.buf, 0);
+ if (len < 0) {
+ if (die_on_error)
+ die_errno("Invalid symlink '%s'",
+ sb.buf);
+ else
+ goto error_out;
+ }
+ strbuf_swap(&sb, &next_sb);
+ strbuf_release(&next_sb);
} else
break;
}
- if (*cwd && chdir(cwd))
- die_errno ("Could not change back to '%s'", cwd);
+ retval = sb.buf;
+error_out:
+ free(last_elem);
+ if (cwd.len && chdir(cwd.buf))
+ die_errno("Could not change back to '%s'", cwd.buf);
+ strbuf_release(&cwd);
- return buf;
+ return retval;
}
-static const char *get_pwd_cwd(void)
+const char *real_path(const char *path)
{
- static char cwd[PATH_MAX + 1];
- char *pwd;
- struct stat cwd_stat, pwd_stat;
- if (getcwd(cwd, PATH_MAX) == NULL)
- return NULL;
- pwd = getenv("PWD");
- if (pwd && strcmp(pwd, cwd)) {
- stat(cwd, &cwd_stat);
- if ((cwd_stat.st_dev || cwd_stat.st_ino) &&
- !stat(pwd, &pwd_stat) &&
- pwd_stat.st_dev == cwd_stat.st_dev &&
- pwd_stat.st_ino == cwd_stat.st_ino) {
- strlcpy(cwd, pwd, PATH_MAX);
- }
- }
- return cwd;
+ return real_path_internal(path, 1);
+}
+
+const char *real_path_if_valid(const char *path)
+{
+ return real_path_internal(path, 0);
}
/*
* Use this to get an absolute path from a relative one. If you want
* to resolve links, you should use real_path.
- *
- * If the path is already absolute, then return path. As the user is
- * never meant to free the return value, we're safe.
*/
const char *absolute_path(const char *path)
{
- static char buf[PATH_MAX + 1];
-
- if (!*path) {
- die("The empty string is not a valid path");
- } else if (is_absolute_path(path)) {
- if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
- die("Too long path: %.*s", 60, path);
- } else {
- size_t len;
- const char *fmt;
- const char *cwd = get_pwd_cwd();
- if (!cwd)
- die_errno("Cannot determine the current working directory");
- len = strlen(cwd);
- fmt = (len > 0 && is_dir_sep(cwd[len-1])) ? "%s%s" : "%s/%s";
- if (snprintf(buf, PATH_MAX, fmt, cwd, path) >= PATH_MAX)
- die("Too long path: %.*s", 60, path);
- }
- return buf;
+ static struct strbuf sb = STRBUF_INIT;
+ strbuf_reset(&sb);
+ strbuf_add_absolute_path(&sb, path);
+ return sb.buf;
}
/*
*/
const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
{
- static char path[PATH_MAX];
-#ifndef WIN32
+ static struct strbuf path = STRBUF_INIT;
+#ifndef GIT_WINDOWS_NATIVE
if (!pfx_len || is_absolute_path(arg))
return arg;
- memcpy(path, pfx, pfx_len);
- strcpy(path + pfx_len, arg);
+ strbuf_reset(&path);
+ strbuf_add(&path, pfx, pfx_len);
+ strbuf_addstr(&path, arg);
#else
char *p;
/* don't add prefix to absolute paths, but still replace '\' by '/' */
+ strbuf_reset(&path);
if (is_absolute_path(arg))
pfx_len = 0;
else if (pfx_len)
- memcpy(path, pfx, pfx_len);
- strcpy(path + pfx_len, arg);
- for (p = path + pfx_len; *p; p++)
+ strbuf_add(&path, pfx, pfx_len);
+ strbuf_addstr(&path, arg);
+ for (p = path.buf + pfx_len; *p; p++)
if (*p == '\\')
*p = '/';
#endif
- return path;
+ return path.buf;
}