translate shell code to c

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 272 insertions, 0 deletions

diff --git a/src/adjbacklight.c b/src/adjbacklight.c
new file mode 100644
index 0000000..d50fbce
--- /dev/null
+++ b/src/adjbacklight.c
@@ -0,0 +1,272 @@
+/**
+ * adjbacklight – Convient method for adjusting the backlight on your portable computer
+ * 
+ * Copyright © 2012, 2013, 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <string.h>
+
+
+/**
+ * The years this software has been developed
+ */
+#define _YEARS_  "2012, 2013, 2014"
+
+
+/**
+ * Forking method
+ */
+#define FORK  vfork
+
+
+/**
+ * Print a line to stdout
+ * 
+ * @param  S:char*  The string to print
+ */
+#define P(S)  printf("%s", S "\n")
+
+
+
+#define  adjust(X,Y,Z)
+
+
+
+/**
+ * This is the mane entry point of the program
+ * 
+ * @param   argc  The number of elements in `argv`
+ * @parma   argv  Command line arguments, including the command
+ * @return        Exit value, zero on success
+ */
+int main(int argc, char** argv)
+{
+  struct winsize win;
+  int rows, cols;
+  struct termios saved_stty;
+  struct termios stty;
+  pid_t pid;
+  
+  int i, j;
+  int all = 0;
+  char** devices = alloca(argc * sizeof(char*));
+  int ndevices = 0;
+  
+  
+  if (argc > 1)
+    {
+      char* arg;
+      for (i = 1; i < argc; i++)
+	{
+	  #define T(S)  (!strcmp(arg, S))
+	  arg = *(argv + i);
+	  if (T("-a") || T("--all"))
+	    all = 1;
+	  else if (T("-c") || T("--copyright") || T("--copying"))
+	    {
+	      P("\n");
+	      P("adjbacklight – Convient method for adjusting the backlight on your portable computer");
+	      P("");
+	      P("Copyright © " _YEARS_ "  Mattias Andrée (maandree@member.fsf.org)");
+	      P("");
+	      P("This program is free software: you can redistribute it and/or modify");
+	      P("it under the terms of the GNU General Public License as published by");
+	      P("the Free Software Foundation, either version 3 of the License, or");
+	      P("(at your option) any later version.");
+	      P("");
+	      P("This program is distributed in the hope that it will be useful,");
+	      P("but WITHOUT ANY WARRANTY; without even the implied warranty of");
+	      P("MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the");
+	      P("GNU General Public License for more details.");
+	      P("");
+	      P("You should have received a copy of the GNU General Public License");
+	      P("along with this program.  If not, see <http://www.gnu.org/licenses/>.");
+	      P("\n");
+	      return 0;
+	    }
+	  else if (T("-w") || T("--warranty"))
+	    {
+	      P("\n");
+	      P("This program is distributed in the hope that it will be useful,");
+	      P("but WITHOUT ANY WARRANTY; without even the implied warranty of");
+	      P("MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the");
+	      P("GNU General Public License for more details.");
+	      P("\n");
+	      return 0;
+	    }
+	  else
+	    {
+	      if (*arg && (*arg != '-'))
+		*(devices + ndevices++) = arg;
+	    }
+	  #undef T
+	}
+      if (all + ndevices == 0)
+	{
+	  P("\n");
+	  P("adjbacklight - Convient method for adjusting the backlight on your portable computer");
+	  P("");
+	  P("USAGE: adjbacklight [ -c | -w | -a | DEVICE...]");
+	  P("");
+	  P("Run with options to adjust the backlight on your monitors.");
+	  P("");
+	  P("");
+	  P("OPTIONS:");
+	  P("");
+	  P("-c");
+	  P("--copyright");
+	  P("--copying       Display copyright information");
+	  P("");
+	  P("-w");
+	  P("--warranty      Display warranty disclaimer");
+	  P("");
+	  P("-a");
+	  P("--all           Run for all devices, including ACPI devices ");
+	  P("");
+	  P("");
+	  P("KEYBOARD:");
+	  P("");
+	  P("←");
+	  P("↓               Darken the screen");
+	  P("");
+	  P("→");
+	  P("↑               Brighten the screen");
+	  P("");
+	  P("q");
+	  P("enter");
+	  P("C-d             Continue to next controller, or if at last, quit");
+	  P("");
+	  P("");
+	  P("");
+	  P("Copyright © " _YEARS_ "  Mattias Andrée (maandree@member.fsf.org)");
+	  P("");
+	  P("This program is free software: you can redistribute it and/or modify");
+	  P("it under the terms of the GNU General Public License as published by");
+	  P("the Free Software Foundation, either version 3 of the License, or");
+	  P("(at your option) any later version.");
+	  P("");
+	  return 0;
+	}
+    }
+  
+  
+  P("\n");
+  P("If the program is abnormally aborted the may be some residual");
+  P("effects on the terminal. the following commands should reset it:");
+  P("");
+  P("    stty icanon echo");
+  P("    echo -en '\\e[?25h'");
+  P("");
+  P("\n\n\n");
+  
+  
+  /* rows cols = $(stty size) */
+  if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == -1)
+    {
+      perror(*argv);
+      rows = 24;
+      cols = 80;
+    }
+  else
+    {
+      rows = win.ws_row;
+      cols = win.ws_col;
+    }
+  
+  /* Hide cursor */
+  printf("%s", "\033[?25l");
+  fflush(stdout);
+  
+  /* stty -icanon -echo */
+  if (tcgetattr(STDIN_FILENO, &saved_stty))
+    {
+      perror(*argv);
+      return 1;
+    }
+  saved_stty = stty;
+  stty.c_lflag &= ~(ICANON | ECHO);
+  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &stty))
+    {
+      perror(*argv);
+      return 1;
+    }
+  
+  
+  /* Fork to diminish risk for unclean exit  */
+  pid = FORK();
+  if (pid == (pid_t)-1)
+    {
+      perror(*argv);
+      pid = 0;
+    }
+  
+  if (pid)
+    waitpid(pid, NULL, 0);
+  else
+    if (ndevices)
+      {
+	char* device;
+	for (i = 0; i < ndevices; i++)
+	  {
+	    device = *(devices + i);
+	    for (j = 0; *(device + j); j++)
+	      if (*(device + j) == '/')
+		{
+		  device += j + 1;
+		  j = -1;
+		}
+	    adjust(rows, cols, device);
+	  }
+      }
+    else
+      {
+	struct dirent* ent;
+	DIR* dir = opendir("/sys/class/backlight");
+	if (dir)
+	  {
+	    char* device;
+	    char* forbidden = "acpi_video";
+	    while ((ent = readdir(dir)))
+	      {
+		device = ent->d_name;
+		if (all || (strstr(device, forbidden) != forbidden))
+		  adjust(rows, cols, device);
+	      }
+	    closedir(dir);
+	  }
+      }
+  
+  
+  /* `stty icanon echo` */
+  tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_stty);
+    {
+      perror(*argv);
+      return 1;
+    }
+  
+  /* Show cursor */
+  printf("%s", "\033[?25h");
+  fflush(stdout);
+  
+  return 0;
+}
+