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Introduce new static function real_path_internal()

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It accepts a new parameter, die_on_error.  If die_on_error is false,
it simply cleans up after itself and returns NULL rather than dying.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Jeff King <peff@peff.net>
This commit is contained in:
Michael Haggerty 2012-10-28 17:16:20 +01:00 committed by Jeff King
parent 652398a88e
commit 038e55fec2
1 changed files with 72 additions and 21 deletions
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93
abspath.c
View File

@ -15,15 +15,26 @@ int is_directory(const char *path)
#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 *retval = NULL;
char cwd[1024] = "";
int buf_index = 1;
@ -35,11 +46,19 @@ const char *real_path(const char *path)
if (path == buf || path == next_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);
if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) {
if (die_on_error)
die("Too long path: %.*s", 60, path);
else
goto error_out;
}
while (depth--) {
if (!is_directory(buf)) {
@ -54,20 +73,36 @@ const char *real_path(const char *path)
}
if (*buf) {
if (!*cwd && !getcwd(cwd, sizeof(cwd)))
die_errno ("Could not get current working directory");
if (!*cwd && !getcwd(cwd, sizeof(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(buf)) {
if (die_on_error)
die_errno("Could not switch to '%s'", buf);
else
goto error_out;
}
}
if (!getcwd(buf, PATH_MAX)) {
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 + strlen(last_elem) + 2 > PATH_MAX) {
if (die_on_error)
die("Too long path name: '%s/%s'",
buf, last_elem);
else
goto error_out;
}
if (len && !is_dir_sep(buf[len-1]))
buf[len++] = '/';
strcpy(buf + len, last_elem);
@ -77,10 +112,18 @@ const char *real_path(const char *path)
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);
if (len < 0) {
if (die_on_error)
die_errno("Invalid symlink '%s'", buf);
else
goto error_out;
}
if (PATH_MAX <= len) {
if (die_on_error)
die("symbolic link too long: %s", buf);
else
goto error_out;
}
next_buf[len] = '\0';
buf = next_buf;
buf_index = 1 - buf_index;
@ -89,10 +132,18 @@ const char *real_path(const char *path)
break;
}
retval = buf;
error_out:
free(last_elem);
if (*cwd && chdir(cwd))
die_errno ("Could not change back to '%s'", cwd);
return buf;
return retval;
}
const char *real_path(const char *path)
{
return real_path_internal(path, 1);
}
static const char *get_pwd_cwd(void)