mirror of
https://github.com/jerryscript-project/jerryscript.git
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a8f2d31bca
Added `handler` module to `jerry-ext` to contain implementation of commonly used external function handlers: `assert`, `gc`, and `print`. Also adapted jerry-main to use jerry-ext/handler JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu
104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
/* Copyright JS Foundation and other contributors, http://js.foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "jerryscript-ext/handler.h"
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/**
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* Provide a 'print' implementation for scripts.
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*
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* The routine converts all of its arguments to strings and outputs them
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* char-by-char using jerryx_port_handler_print_char.
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*
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* The NUL character is output as "\u0000", other characters are output
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* bytewise.
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*
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* Note:
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* This implementation does not use standard C `printf` to print its
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* output. This allows more flexibility but also extends the core
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* JerryScript engine port API. Applications that want to use
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* `jerryx_handler_print` must ensure that their port implementation also
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* provides `jerryx_port_handler_print_char`.
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*
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* @return undefined - if all arguments could be converted to strings,
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* error - otherwise.
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*/
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jerry_value_t
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jerryx_handler_print (const jerry_value_t func_obj_val, /**< function object */
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const jerry_value_t this_p, /**< this arg */
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const jerry_value_t args_p[], /**< function arguments */
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const jerry_length_t args_cnt) /**< number of function arguments */
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{
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(void) func_obj_val; /* unused */
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(void) this_p; /* unused */
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static const char *null_str = "\\u0000";
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jerry_value_t ret_val = jerry_create_undefined ();
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for (jerry_length_t arg_index = 0;
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jerry_value_is_undefined (ret_val) && arg_index < args_cnt;
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arg_index++)
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{
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jerry_value_t str_val = jerry_value_to_string (args_p[arg_index]);
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if (!jerry_value_has_error_flag (str_val))
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{
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if (arg_index != 0)
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{
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jerryx_port_handler_print_char (' ');
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}
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jerry_size_t substr_size;
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jerry_length_t substr_pos = 0;
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jerry_char_t substr_buf[256];
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while ((substr_size = jerry_substring_to_char_buffer (str_val,
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substr_pos,
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substr_pos + 256,
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substr_buf,
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256)) != 0)
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{
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for (jerry_size_t chr_index = 0; chr_index < substr_size; chr_index++)
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{
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char chr = (char) substr_buf[chr_index];
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if (chr == '\0')
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{
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for (jerry_size_t null_index = 0; null_str[null_index] != 0; null_index++)
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{
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jerryx_port_handler_print_char (null_str[null_index]);
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}
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}
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else
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{
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jerryx_port_handler_print_char (chr);
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}
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}
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substr_pos += substr_size;
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}
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jerry_release_value (str_val);
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}
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else
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{
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ret_val = str_val;
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}
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}
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jerryx_port_handler_print_char ('\n');
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return ret_val;
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} /* jerryx_handler_print */
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