1 | /*
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2 | Copyright (c) 2013 Arduino LLC. All right reserved.
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3 |
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4 | This library is free software; you can redistribute it and/or
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5 | modify it under the terms of the GNU Lesser General Public
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6 | License as published by the Free Software Foundation; either
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7 | version 2.1 of the License, or (at your option) any later version.
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8 |
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9 | This library is distributed in the hope that it will be useful,
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 | Lesser General Public License for more details.
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13 |
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14 | You should have received a copy of the GNU Lesser General Public
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15 | License along with this library; if not, write to the Free Software
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16 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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17 | */
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18 |
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19 | #include <Process.h>
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20 |
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21 | Process::~Process() {
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22 | close();
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23 | }
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24 |
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25 | size_t Process::write(uint8_t c) {
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26 | uint8_t cmd[] = {'I', handle, c};
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27 | bridge.transfer(cmd, 3);
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28 | return 1;
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29 | }
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30 |
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31 | void Process::flush() {
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32 | }
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33 |
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34 | int Process::available() {
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35 | // Look if there is new data available
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36 | doBuffer();
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37 | return buffered;
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38 | }
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39 |
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40 | int Process::read() {
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41 | doBuffer();
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42 | if (buffered == 0)
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43 | return -1; // no chars available
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44 | else {
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45 | buffered--;
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46 | return buffer[readPos++];
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47 | }
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48 | }
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49 |
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50 | int Process::peek() {
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51 | doBuffer();
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52 | if (buffered == 0)
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53 | return -1; // no chars available
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54 | else
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55 | return buffer[readPos];
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56 | }
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57 |
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58 | void Process::doBuffer() {
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59 | // If there are already char in buffer exit
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60 | if (buffered > 0)
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61 | return;
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62 |
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63 | // Try to buffer up to 32 characters
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64 | readPos = 0;
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65 | uint8_t cmd[] = {'O', handle, sizeof(buffer)};
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66 | buffered = bridge.transfer(cmd, 3, buffer, sizeof(buffer));
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67 | }
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68 |
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69 | void Process::begin(const String &command) {
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70 | close();
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71 | cmdline = new String(command);
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72 | }
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73 |
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74 | void Process::addParameter(const String ¶m) {
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75 | *cmdline += "\xFE";
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76 | *cmdline += param;
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77 | }
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78 |
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79 | void Process::runAsynchronously() {
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80 | uint8_t cmd[] = {'R'};
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81 | uint8_t res[2];
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82 | bridge.transfer(cmd, 1, (uint8_t*)cmdline->c_str(), cmdline->length(), res, 2);
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83 | handle = res[1];
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84 |
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85 | delete cmdline;
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86 | cmdline = NULL;
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87 |
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88 | if (res[0] == 0) // res[0] contains error code
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89 | started = true;
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90 | }
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91 |
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92 | boolean Process::running() {
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93 | uint8_t cmd[] = {'r', handle};
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94 | uint8_t res[1];
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95 | bridge.transfer(cmd, 2, res, 1);
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96 | return (res[0] == 1);
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97 | }
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98 |
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99 | unsigned int Process::exitValue() {
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100 | uint8_t cmd[] = {'W', handle};
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101 | uint8_t res[2];
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102 | bridge.transfer(cmd, 2, res, 2);
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103 | return (res[0] << 8) + res[1];
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104 | }
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105 |
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106 | unsigned int Process::run() {
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107 | runAsynchronously();
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108 | while (running())
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109 | delay(100);
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110 | return exitValue();
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111 | }
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112 |
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113 | void Process::close() {
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114 | if (started) {
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115 | uint8_t cmd[] = {'w', handle};
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116 | bridge.transfer(cmd, 2);
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117 | }
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118 | started = false;
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119 | }
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120 |
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121 | unsigned int Process::runShellCommand(const String &command) {
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122 | runShellCommandAsynchronously(command);
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123 | while (running())
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124 | delay(100);
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125 | return exitValue();
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126 | }
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127 |
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128 | void Process::runShellCommandAsynchronously(const String &command) {
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129 | begin("/bin/ash");
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130 | addParameter("-c");
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131 | addParameter(command);
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132 | runAsynchronously();
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133 | }
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134 |
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135 | // This method is currently unused
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136 | //static unsigned int __commandOutputAvailable(uint8_t handle) {
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137 | // uint8_t cmd[] = {'o', handle};
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138 | // uint8_t res[1];
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139 | // Bridge.transfer(cmd, 2, res, 1);
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140 | // return res[0];
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141 | //}
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142 |
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