1 | /* |
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2 | * neercs console-based window manager |
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3 | * Copyright (c) 2006 Sam Hocevar <sam@zoy.org> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * $Id: main.c 1437 2006-11-27 14:46:24Z sam $ |
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7 | * |
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8 | * This program is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the Do What The Fuck You Want To |
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10 | * Public License, Version 2, as published by Sam Hocevar. See |
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11 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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12 | */ |
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13 | |
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14 | #include "config.h" |
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15 | |
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16 | #include <stdio.h> |
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17 | #include <string.h> |
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18 | #include <stdlib.h> |
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19 | #include <unistd.h> |
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20 | #include <fcntl.h> |
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21 | #include <sys/ioctl.h> |
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22 | #if defined HAVE_PTY_H |
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23 | # include <pty.h> /* for openpty and forkpty */ |
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24 | #else |
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25 | # include <util.h> /* for OS X */ |
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26 | #endif |
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27 | #include <errno.h> |
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28 | #include <cucul.h> |
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29 | #include <caca.h> |
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30 | |
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31 | #include "neercs.h" |
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32 | |
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33 | #define XTAB 5 |
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34 | #define YTAB 3 |
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35 | |
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36 | static int create_pty(char *cmd, unsigned int w, unsigned int h); |
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37 | static int set_tty_size(int fd, unsigned int w, unsigned int h); |
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38 | |
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39 | int main(int argc, char **argv) |
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40 | { |
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41 | static cucul_canvas_t *cv; |
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42 | static caca_display_t *dp; |
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43 | static struct screen *screen; |
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44 | int pty = 0, prevpty = 0, i, n, w, h, eof = 0, refresh = 1, command = 0; |
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45 | |
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46 | if(argc < 2) |
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47 | { |
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48 | fprintf(stderr, "usage: %s <cmd1> [<cmd2> [<cmd3> ...]]\n", argv[0]); |
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49 | fprintf(stderr, "eg. \"%s zsh bash\"\n", argv[0]); |
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50 | return 1; |
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51 | } |
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52 | |
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53 | cv = cucul_create_canvas(0, 0); |
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54 | dp = caca_create_display(cv); |
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55 | if(!dp) |
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56 | return 1; |
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57 | |
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58 | n = argc - 1; |
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59 | screen = malloc(n * sizeof(struct screen)); |
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60 | |
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61 | w = cucul_get_canvas_width(cv); |
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62 | h = cucul_get_canvas_height(cv); |
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63 | |
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64 | w = w <= XTAB * n ? 1 : w - XTAB * (n - 1) - 2; |
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65 | h = h <= YTAB * n ? 1 : h - YTAB * (n - 1) - 2; |
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66 | |
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67 | for(i = 0; i < n; i++) |
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68 | { |
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69 | screen[i].cv = cucul_create_canvas(w, h); |
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70 | screen[i].init = 0; |
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71 | } |
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72 | |
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73 | cucul_set_color_ansi(cv, CUCUL_LIGHTRED, CUCUL_BLACK); |
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74 | cucul_draw_cp437_box(cv, (n - 1 - pty) * XTAB, pty * YTAB, |
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75 | w + (n - 1 - pty) * XTAB + 1, h + pty * YTAB + 1); |
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76 | |
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77 | caca_refresh_display(dp); |
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78 | |
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79 | for(i = 0; i < n; i++) |
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80 | { |
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81 | screen[i].buf = NULL; |
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82 | screen[i].total = 0; |
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83 | screen[i].fd = create_pty(argv[i + 1], w, h); |
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84 | if(screen[i].fd < 0) |
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85 | return -1; |
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86 | } |
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87 | |
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88 | for(;;) |
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89 | { |
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90 | struct timeval tv; |
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91 | fd_set fdset; |
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92 | caca_event_t ev; |
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93 | int maxfd = 0, ret; |
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94 | |
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95 | /* Read data, if any */ |
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96 | FD_ZERO(&fdset); |
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97 | for(i = 0; i < n; i++) |
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98 | { |
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99 | FD_SET(screen[i].fd, &fdset); |
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100 | if(screen[i].fd > maxfd) |
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101 | maxfd = screen[i].fd; |
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102 | } |
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103 | tv.tv_sec = 0; |
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104 | tv.tv_usec = 50000; |
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105 | ret = select(maxfd + 1, &fdset, NULL, NULL, &tv); |
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106 | |
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107 | if(ret < 0) |
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108 | { |
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109 | if(errno == EINTR) |
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110 | ; /* We probably got a SIGWINCH, ignore it */ |
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111 | else |
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112 | { |
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113 | for(i = 0; i < n; i++) |
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114 | if(screen[i].total) |
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115 | break; |
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116 | if(i == n) |
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117 | break; |
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118 | } |
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119 | } |
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120 | else if(ret) for(i = 0; i < n; i++) |
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121 | { |
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122 | /* FIXME: try a new strategy: read all filedescriptors until |
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123 | * each of them starved at least once. */ |
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124 | |
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125 | if(!FD_ISSET(screen[i].fd, &fdset)) |
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126 | continue; |
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127 | |
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128 | for(;;) |
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129 | { |
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130 | ssize_t nr; |
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131 | |
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132 | screen[i].buf = realloc(screen[i].buf, screen[i].total + 1024); |
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133 | nr = read(screen[i].fd, screen[i].buf + screen[i].total, 1024); |
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134 | |
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135 | if(nr > 0) |
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136 | { |
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137 | screen[i].total += nr; |
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138 | continue; |
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139 | } |
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140 | |
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141 | if(nr == 0 || errno != EWOULDBLOCK) |
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142 | eof = 1; |
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143 | |
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144 | break; |
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145 | } |
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146 | } |
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147 | |
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148 | for(i = 0; i < n; i++) if(screen[i].total) |
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149 | { |
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150 | unsigned long int bytes; |
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151 | |
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152 | bytes = import_term(&screen[i], screen[i].buf, screen[i].total); |
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153 | |
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154 | if(bytes > 0) |
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155 | { |
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156 | screen[i].total -= bytes; |
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157 | memmove(screen[i].buf, screen[i].buf + bytes, screen[i].total); |
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158 | refresh = 1; |
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159 | } |
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160 | } |
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161 | |
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162 | /* Get events, if any */ |
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163 | ret = caca_get_event(dp, CACA_EVENT_ANY, &ev, 0); |
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164 | if(ret && (ev.type & CACA_EVENT_KEY_PRESS)) |
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165 | { |
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166 | if(command) |
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167 | { |
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168 | command = 0; |
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169 | |
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170 | switch(ev.data.key.ch) |
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171 | { |
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172 | case 0x01: //CACA_KEY_CTRL_A: |
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173 | pty ^= prevpty; |
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174 | prevpty ^= pty; |
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175 | pty ^= prevpty; |
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176 | refresh = 1; |
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177 | break; |
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178 | case 'n': |
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179 | case ' ': |
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180 | case '\0': |
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181 | case 0x0e: //CACA_KEY_CTRL_N: |
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182 | prevpty = pty; |
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183 | pty = (pty + 1) % n; |
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184 | refresh = 1; |
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185 | break; |
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186 | case 'p': |
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187 | case 0x10: //CACA_KEY_CTRL_P: |
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188 | prevpty = pty; |
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189 | pty = (pty + n - 1) % n; |
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190 | refresh = 1; |
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191 | break; |
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192 | } |
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193 | } |
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194 | else |
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195 | { |
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196 | switch(ev.data.key.ch) |
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197 | { |
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198 | case 0x01: //CACA_KEY_CTRL_A: |
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199 | command = 1; break; |
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200 | case CACA_KEY_UP: |
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201 | write(screen[pty].fd, "\x1b[A", 3); break; |
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202 | case CACA_KEY_DOWN: |
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203 | write(screen[pty].fd, "\x1b[B", 3); break; |
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204 | case CACA_KEY_RIGHT: |
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205 | write(screen[pty].fd, "\x1b[C", 3); break; |
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206 | case CACA_KEY_LEFT: |
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207 | write(screen[pty].fd, "\x1b[D", 3); break; |
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208 | default: |
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209 | write(screen[pty].fd, &ev.data.key.ch, 1); break; |
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210 | } |
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211 | } |
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212 | } |
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213 | else if(ret && (ev.type & CACA_EVENT_RESIZE)) |
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214 | { |
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215 | w = cucul_get_canvas_width(cv); |
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216 | h = cucul_get_canvas_height(cv); |
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217 | w = w <= XTAB * n ? 1 : w - XTAB * (n - 1) - 2; |
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218 | h = h <= YTAB * n ? 1 : h - YTAB * (n - 1) - 2; |
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219 | for(i = 0; i < n; i++) |
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220 | { |
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221 | cucul_set_canvas_size(screen[i].cv, w, h); |
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222 | set_tty_size(screen[i].fd, w, h); |
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223 | } |
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224 | cucul_clear_canvas(cv); |
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225 | refresh = 1; |
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226 | } |
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227 | |
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228 | /* Refresh screen */ |
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229 | if(refresh) |
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230 | { |
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231 | refresh = 0; |
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232 | |
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233 | for(i = 0; i < n; i++) |
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234 | { |
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235 | int j = (pty + n - 1 - i) % n; |
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236 | cucul_blit(cv, (n - 1 - j) * XTAB + 1, |
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237 | j * YTAB + 1, screen[j].cv, NULL); |
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238 | cucul_draw_cp437_box(cv, (n - 1 - j) * XTAB, j * YTAB, |
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239 | w + (n - 1 - j) * XTAB + 1, h + j * YTAB + 1); |
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240 | } |
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241 | caca_refresh_display(dp); |
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242 | } |
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243 | |
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244 | if(eof) |
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245 | { |
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246 | for(i = 0; i < n; i++) |
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247 | if(screen[i].total) |
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248 | break; |
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249 | if(i == n) |
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250 | break; |
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251 | } |
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252 | } |
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253 | |
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254 | caca_get_event(dp, CACA_EVENT_KEY_PRESS, NULL, -1); |
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255 | |
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256 | /* Clean up */ |
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257 | caca_free_display(dp); |
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258 | cucul_free_canvas(cv); |
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259 | for(i = 0; i < n; i++) |
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260 | cucul_free_canvas(screen[i].cv); |
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261 | |
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262 | return 0; |
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263 | } |
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264 | |
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265 | static int create_pty(char *cmd, unsigned int w, unsigned int h) |
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266 | { |
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267 | char **argv; |
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268 | int fd; |
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269 | pid_t pid; |
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270 | |
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271 | pid = forkpty(&fd, NULL, NULL, NULL); |
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272 | if(pid < 0) |
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273 | { |
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274 | fprintf(stderr, "forkpty() error\n"); |
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275 | return -1; |
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276 | } |
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277 | else if(pid == 0) |
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278 | { |
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279 | set_tty_size(0, w, h); |
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280 | putenv("CACA_DRIVER=slang"); |
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281 | putenv("TERM=xterm"); |
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282 | argv = malloc(2 * sizeof(char *)); |
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283 | argv[0] = cmd; |
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284 | argv[1] = NULL; |
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285 | execvp(cmd, argv); |
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286 | fprintf(stderr, "execvp() error\n"); |
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287 | return -1; |
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288 | } |
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289 | |
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290 | fcntl(fd, F_SETFL, O_NDELAY); |
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291 | return fd; |
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292 | #if 0 |
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293 | fprintf(stderr, "forkpty() not available\n"); |
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294 | return -1; |
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295 | #endif |
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296 | } |
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297 | |
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298 | static int set_tty_size(int fd, unsigned int w, unsigned int h) |
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299 | { |
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300 | struct winsize ws; |
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301 | |
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302 | memset(&ws, 0, sizeof(ws)); |
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303 | ws.ws_row = h; |
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304 | ws.ws_col = w; |
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305 | ioctl(fd, TIOCSWINSZ, (char *)&ws); |
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306 | |
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307 | return 0; |
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308 | } |
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309 | |
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