diff options
| -rw-r--r-- | lib/fs.c | 38 | ||||
| -rw-r--r-- | tests/custom/03_stdlib/40_proto | 1 |
2 files changed, 39 insertions, 0 deletions
@@ -739,6 +739,43 @@ uc_fs_seek(uc_vm_t *vm, size_t nargs) } /** + * Truncate file to a given size + * + * Returns `true` if the file was successfully truncated. + * + * Returns `null` if an error occurred. + * + * @function module:fs.file#truncate + * + * @param {number} [offset=0] + * The offset in bytes. + * + * @returns {?boolean} + */ +static uc_value_t * +uc_fs_truncate(uc_vm_t *vm, size_t nargs) +{ + FILE *fp = uc_fn_thisval("fs.file"); + uc_value_t *ofs = uc_fn_arg(0); + off_t offset; + + if (!fp) + err_return(EBADF); + + if (!ofs) + offset = 0; + else if (ucv_type(ofs) != UC_INTEGER) + err_return(EINVAL); + else + offset = (off_t)ucv_int64_get(ofs); + + if (ftruncate(fileno(fp), offset) < 0) + err_return(errno); + + return ucv_boolean_new(true); +} + +/** * Obtain current read position. * * Obtains the current, absolute read position of the open file. @@ -2571,6 +2608,7 @@ static const uc_function_list_t file_fns[] = { { "fileno", uc_fs_fileno }, { "error", uc_fs_error }, { "isatty", uc_fs_isatty }, + { "truncate", uc_fs_truncate }, }; static const uc_function_list_t dir_fns[] = { diff --git a/tests/custom/03_stdlib/40_proto b/tests/custom/03_stdlib/40_proto index 2a12966..6fed529 100644 --- a/tests/custom/03_stdlib/40_proto +++ b/tests/custom/03_stdlib/40_proto @@ -38,6 +38,7 @@ When invoked with two arguments, returns the given value. Hello, World! [ { + "truncate": "function truncate(...) { [native code] }", "isatty": "function isatty(...) { [native code] }", "error": "function error(...) { [native code] }", "fileno": "function fileno(...) { [native code] }", |