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unix/main: Remove PATH_MAX from realpath.

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POSIX.1-2008 ensures realpath() give a dynamically allocated buffer if
NULL is passed (which is also true for ports/windows/realpath.c),
avoiding an explicit call to malloc() and use of PATH_MAX, which may be
undefined on some systems.

Signed-off-by: David Yang <mmyangfl@gmail.com>
This commit is contained in:
David Yang
2025-03-21 10:25:40 +08:00
parent 52ca826880
commit 6025b78d01
1 changed files with 12 additions and 6 deletions
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18
ports/unix/main.c
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@@ -453,10 +453,13 @@ static void set_sys_argv(char *argv[], int argc, int start_arg) {
#if MICROPY_PY_SYS_EXECUTABLE
extern mp_obj_str_t mp_sys_executable_obj;
static char executable_path[MICROPY_ALLOC_PATH_MAX];
static char *executable_path = NULL;
static void sys_set_excecutable(char *argv0) {
if (realpath(argv0, executable_path)) {
if (executable_path == NULL) {
executable_path = realpath(argv0, NULL);
}
if (executable_path != NULL) {
mp_obj_str_set_data(&mp_sys_executable_obj, (byte *)executable_path, strlen(executable_path));
}
}
@@ -721,11 +724,9 @@ MP_NOINLINE int main_(int argc, char **argv) {
return invalid_args();
}
} else {
char *pathbuf = malloc(PATH_MAX);
char *basedir = realpath(argv[a], pathbuf);
char *basedir = realpath(argv[a], NULL);
if (basedir == NULL) {
mp_printf(&mp_stderr_print, "%s: can't open file '%s': [Errno %d] %s\n", argv[0], argv[a], errno, strerror(errno));
free(pathbuf);
// CPython exits with 2 in such case
ret = 2;
break;
@@ -734,7 +735,7 @@ MP_NOINLINE int main_(int argc, char **argv) {
// Set base dir of the script as first entry in sys.path.
char *p = strrchr(basedir, '/');
mp_obj_list_store(mp_sys_path, MP_OBJ_NEW_SMALL_INT(0), mp_obj_new_str_via_qstr(basedir, p - basedir));
free(pathbuf);
free(basedir);
set_sys_argv(argv, argc, a);
ret = do_file(argv[a]);
@@ -800,6 +801,11 @@ MP_NOINLINE int main_(int argc, char **argv) {
#endif
#endif
#if MICROPY_PY_SYS_EXECUTABLE && !defined(NDEBUG)
// Again, make memory leak detector happy
free(executable_path);
#endif
// printf("total bytes = %d\n", m_get_total_bytes_allocated());
return ret & 0xff;
}