diff options
Diffstat (limited to 'lib/fs.c')
| -rw-r--r-- | lib/fs.c | 38 |
1 files changed, 38 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[] = { |