121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
// Copyright 2016-2017 Espressif Systems (Shanghai) PTE LTD
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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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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#define SS_FLAG_ESCAPE 0x8
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typedef enum {
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/* parsing the space between arguments */
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SS_SPACE = 0x0,
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/* parsing an argument which isn't quoted */
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SS_ARG = 0x1,
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/* parsing a quoted argument */
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SS_QUOTED_ARG = 0x2,
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/* parsing an escape sequence within unquoted argument */
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SS_ARG_ESCAPED = SS_ARG | SS_FLAG_ESCAPE,
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/* parsing an escape sequence within a quoted argument */
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SS_QUOTED_ARG_ESCAPED = SS_QUOTED_ARG | SS_FLAG_ESCAPE,
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} split_state_t;
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size_t esp_console_split_argv(char *line, char **argv, size_t argv_size)
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{
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const int QUOTE = '"';
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const int ESCAPE = '\\';
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const int SPACE = ' ';
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split_state_t state = SS_SPACE;
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int argc = 0;
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char *next_arg_start = line;
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char *out_ptr = line;
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for (char *in_ptr = line; argc < argv_size - 1; ++in_ptr) {
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int char_in = (unsigned char) *in_ptr;
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if (char_in == 0) {
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break;
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}
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int char_out = -1;
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/* helper function, called when done with an argument */
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void end_arg() {
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char_out = 0;
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argv[argc++] = next_arg_start;
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state = SS_SPACE;
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}
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switch (state) {
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case SS_SPACE:
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if (char_in == SPACE) {
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/* skip space */
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} else if (char_in == QUOTE) {
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next_arg_start = out_ptr;
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state = SS_QUOTED_ARG;
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} else if (char_in == ESCAPE) {
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next_arg_start = out_ptr;
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state = SS_ARG_ESCAPED;
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} else {
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next_arg_start = out_ptr;
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state = SS_ARG;
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char_out = char_in;
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}
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break;
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case SS_QUOTED_ARG:
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if (char_in == QUOTE) {
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end_arg();
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} else if (char_in == ESCAPE) {
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state = SS_QUOTED_ARG_ESCAPED;
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} else {
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char_out = char_in;
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}
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break;
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case SS_ARG_ESCAPED:
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case SS_QUOTED_ARG_ESCAPED:
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if (char_in == ESCAPE || char_in == QUOTE || char_in == SPACE) {
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char_out = char_in;
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} else {
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/* unrecognized escape character, skip */
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}
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state = (split_state_t) (state & (~SS_FLAG_ESCAPE));
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break;
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case SS_ARG:
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if (char_in == SPACE) {
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end_arg();
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} else if (char_in == ESCAPE) {
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state = SS_ARG_ESCAPED;
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} else {
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char_out = char_in;
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}
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break;
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}
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/* need to output anything? */
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if (char_out >= 0) {
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*out_ptr = char_out;
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++out_ptr;
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}
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}
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/* make sure the final argument is terminated */
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*out_ptr = 0;
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/* finalize the last argument */
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if (state != SS_SPACE && argc < argv_size - 1) {
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argv[argc++] = next_arg_start;
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}
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/* add a NULL at the end of argv */
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argv[argc] = NULL;
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return argc;
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}
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