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catpoint.c - catpoint - Catpoint simple presenting software. |
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git clone git://bitreich.org/catpoint/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/catpoint/ (git://bitreich.org) |
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README |
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LICENSE |
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--- |
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catpoint.c (3893B) |
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--- |
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1 /* See LICENSE file for license details. */ |
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2 |
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3 #include <sys/mman.h> |
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4 #include <sys/stat.h> |
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5 #include <sys/types.h> |
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6 |
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7 #include <curses.h> |
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8 #include <errno.h> |
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9 #include <fcntl.h> |
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10 #include <locale.h> |
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11 #include <signal.h> |
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12 #include <stdarg.h> |
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13 #include <stdio.h> |
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14 #include <stdlib.h> |
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15 #include <string.h> |
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16 #include <unistd.h> |
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17 |
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18 void die(const char *, ...); |
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19 |
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20 char *currentslidep, **slidefiles; /* the slides */ |
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21 int nslides, currentslide, currentslidelen; |
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22 |
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23 volatile sig_atomic_t slidechanged = 1; |
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24 |
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25 void |
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26 unloadcurrentslide(void) |
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27 { |
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28 if (currentslidep == NULL) |
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29 return; |
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30 |
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31 if (munmap(currentslidep, currentslidelen) < 0) |
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32 die("munmap: %s", slidefiles[currentslide]); |
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33 } |
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34 |
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35 void |
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36 cleanup(void) |
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37 { |
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38 unloadcurrentslide(); |
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39 |
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40 endwin(); /* restore terminal */ |
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41 } |
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42 |
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43 /* print to stderr, call cleanup() and _exit(). */ |
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44 void |
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45 die(const char *fmt, ...) |
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46 { |
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47 va_list ap; |
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48 int saved_errno; |
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49 |
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50 saved_errno = errno; |
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51 cleanup(); |
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52 |
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53 va_start(ap, fmt); |
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54 vfprintf(stderr, fmt, ap); |
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55 va_end(ap); |
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56 |
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57 if (saved_errno) |
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58 fprintf(stderr, ": %s", strerror(saved_errno)); |
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59 fflush(stderr); |
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60 write(2, "\n", 1); |
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61 |
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62 _exit(1); |
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63 } |
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64 |
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65 void |
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66 quit(int sig) |
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67 { |
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68 cleanup(); |
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69 _exit(128 + sig); |
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70 } |
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71 |
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72 void |
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73 loadcurrentslide(char **argv, int slide) |
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74 { |
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75 struct stat statbuf; |
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76 int fd; |
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77 |
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78 unloadcurrentslide(); |
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79 |
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80 fd = open(slidefiles[slide], O_RDONLY, 0); |
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81 if (fd < 0) |
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82 die("open: %s", slidefiles[slide]); |
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83 if (fstat(fd, &statbuf) < 0) |
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84 die("fstat: %s", slidefiles[slide]); |
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85 currentslidep = mmap(NULL, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
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86 if (currentslidep == MAP_FAILED) { |
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87 currentslidep = NULL; |
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88 die("mmap: %s", slidefiles[slide]); |
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89 } |
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90 currentslidelen = statbuf.st_size; |
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91 close(fd); |
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92 } |
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93 |
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94 void |
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95 reloadcurrentslide(int sig) |
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96 { |
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97 /* |
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98 * Keep this out of SIGHUP, in case this is used somewhere else. |
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99 */ |
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100 slidechanged = 1; |
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101 |
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102 if (sig == SIGHUP) { |
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103 /* Make ncurses redisplay slide. */ |
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104 if (raise(SIGWINCH) < 0) |
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105 die("raise"); |
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106 } |
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107 } |
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108 |
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109 void |
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110 setsignal() |
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111 { |
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112 struct sigaction sa; |
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113 |
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114 memset(&sa, 0, sizeof(sa)); |
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115 sigemptyset(&sa.sa_mask); |
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116 sa.sa_flags = 0; |
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117 |
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118 sa.sa_handler = quit; |
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119 sigaction(SIGINT, &sa, NULL); |
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120 sigaction(SIGQUIT, &sa, NULL); |
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121 sigaction(SIGTERM, &sa, NULL); |
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122 |
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123 sa.sa_handler = reloadcurrentslide; |
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124 sigaction(SIGHUP, &sa, NULL); |
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125 } |
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126 |
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127 int |
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128 main(int argc, char *argv[]) |
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129 { |
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130 int c; |
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131 |
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132 if (argc == 1) { |
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133 errno = 0; |
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134 die("usage: %s file ...", argv[0]); |
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135 } |
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136 slidefiles = ++argv; |
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137 nslides = --argc; |
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138 |
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139 setsignal(); |
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140 setlocale(LC_ALL, ""); |
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141 |
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142 /* start */ |
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143 currentslide = 0; |
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144 currentslidep = NULL; |
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145 currentslidelen = 0; |
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146 |
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147 /* init curses */ |
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148 initscr(); |
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149 cbreak(); |
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150 noecho(); |
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151 nonl(); |
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152 intrflush(stdscr, FALSE); |
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153 keypad(stdscr, TRUE); |
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154 curs_set(FALSE); /* hide cursor */ |
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155 |
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156 show: |
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157 /* display slide if changed */ |
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158 if (slidechanged) { |
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159 slidechanged = 0; |
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160 loadcurrentslide(slidefiles, currentslide); |
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161 } |
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162 clear(); |
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163 refresh(); |
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164 printw("%.*s", currentslidelen, currentslidep); |
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165 |
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166 again: |
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167 c = getch(); |
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168 switch (c) { |
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169 /* powerpoint remote presenter shortcuts */ |
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170 case 4: /* ^D, EOT */ |
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171 case 27: |
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172 case KEY_F(5): |
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173 /* end presentation */ |
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174 case 'q': |
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175 break; |
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176 /* next */ |
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177 case ' ': |
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178 case 'l': |
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179 case 'j': |
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180 case KEY_RIGHT: |
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181 case KEY_DOWN: |
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182 case KEY_NPAGE: |
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183 if (currentslide < nslides - 1) { |
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184 slidechanged = 1; |
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185 currentslide++; |
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186 goto show; |
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187 } |
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188 goto again; |
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189 /* prev */ |
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190 case 'h': |
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191 case 'k': |
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192 case KEY_LEFT: |
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193 case KEY_UP: |
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194 case KEY_PPAGE: |
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195 if (currentslide > 0) { |
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196 slidechanged = 1; |
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197 currentslide--; |
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198 goto show; |
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199 } |
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200 goto again; |
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201 /* shortcut from powerpoint. Needed for remote presenters. */ |
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202 case '.': |
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203 /* first */ |
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204 case 'u': |
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205 case KEY_BEG: |
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206 case KEY_HOME: |
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207 if (currentslide != 0) |
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208 slidechanged = 1; |
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209 currentslide = 0; |
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210 goto show; |
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211 /* last */ |
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212 case 'i': |
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213 case KEY_END: |
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214 if (currentslide != (nslides - 1)) |
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215 slidechanged = 1; |
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216 currentslide = nslides - 1; |
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217 goto show; |
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218 /* reload */ |
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219 case 'r': |
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220 case 12: /* ^L, redraw */ |
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221 case KEY_RESIZE: /* resize / SIGWINCH */ |
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222 goto show; |
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223 default: |
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224 /* printf("key pressed = '%d'\n", c); */ |
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225 goto again; |
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226 } |
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227 |
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228 cleanup(); |
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229 |
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230 return 0; |
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231 } |
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