Bundle less (version 444) for Windows.

[apitrace] / thirdparty / less / signal.c

diff --git a/thirdparty/less/signal.c b/thirdparty/less/signal.c
new file mode 100644 (file)
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+++ b/thirdparty/less/signal.c
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+/*
+ * Copyright (C) 1984-2011  Mark Nudelman
+ *
+ * You may distribute under the terms of either the GNU General Public
+ * License or the Less License, as specified in the README file.
+ *
+ * For more information about less, or for information on how to 
+ * contact the author, see the README file.
+ */
+
+
+/*
+ * Routines dealing with signals.
+ *
+ * A signal usually merely causes a bit to be set in the "signals" word.
+ * At some convenient time, the mainline code checks to see if any
+ * signals need processing by calling psignal().
+ * If we happen to be reading from a file [in iread()] at the time
+ * the signal is received, we call intread to interrupt the iread.
+ */
+
+#include "less.h"
+#include <signal.h>
+
+/*
+ * "sigs" contains bits indicating signals which need to be processed.
+ */
+public int sigs;
+
+extern int sc_width, sc_height;
+extern int screen_trashed;
+extern int lnloop;
+extern int linenums;
+extern int wscroll;
+extern int reading;
+extern int quit_on_intr;
+extern long jump_sline_fraction;
+
+/*
+ * Interrupt signal handler.
+ */
+       /* ARGSUSED*/
+       static RETSIGTYPE
+u_interrupt(type)
+       int type;
+{
+       bell();
+#if OS2
+       LSIGNAL(SIGINT, SIG_ACK);
+#endif
+       LSIGNAL(SIGINT, u_interrupt);
+       sigs |= S_INTERRUPT;
+#if MSDOS_COMPILER==DJGPPC
+       /*
+        * If a keyboard has been hit, it must be Ctrl-C
+        * (as opposed to Ctrl-Break), so consume it.
+        * (Otherwise, Less will beep when it sees Ctrl-C from keyboard.)
+        */
+       if (kbhit())
+               getkey();
+#endif
+       if (reading)
+               intread(); /* May longjmp */
+}
+
+#ifdef SIGTSTP
+/*
+ * "Stop" (^Z) signal handler.
+ */
+       /* ARGSUSED*/
+       static RETSIGTYPE
+stop(type)
+       int type;
+{
+       LSIGNAL(SIGTSTP, stop);
+       sigs |= S_STOP;
+       if (reading)
+               intread();
+}
+#endif
+
+#ifdef SIGWINCH
+/*
+ * "Window" change handler
+ */
+       /* ARGSUSED*/
+       public RETSIGTYPE
+winch(type)
+       int type;
+{
+       LSIGNAL(SIGWINCH, winch);
+       sigs |= S_WINCH;
+       if (reading)
+               intread();
+}
+#else
+#ifdef SIGWIND
+/*
+ * "Window" change handler
+ */
+       /* ARGSUSED*/
+       public RETSIGTYPE
+winch(type)
+       int type;
+{
+       LSIGNAL(SIGWIND, winch);
+       sigs |= S_WINCH;
+       if (reading)
+               intread();
+}
+#endif
+#endif
+
+#if MSDOS_COMPILER==WIN32C
+/*
+ * Handle CTRL-C and CTRL-BREAK keys.
+ */
+#include "windows.h"
+
+       static BOOL WINAPI 
+wbreak_handler(dwCtrlType)
+       DWORD dwCtrlType;
+{
+       switch (dwCtrlType)
+       {
+       case CTRL_C_EVENT:
+       case CTRL_BREAK_EVENT:
+               sigs |= S_INTERRUPT;
+               return (TRUE);
+       default:
+               break;
+       }
+       return (FALSE);
+}
+#endif
+
+/*
+ * Set up the signal handlers.
+ */
+       public void
+init_signals(on)
+       int on;
+{
+       if (on)
+       {
+               /*
+                * Set signal handlers.
+                */
+               (void) LSIGNAL(SIGINT, u_interrupt);
+#if MSDOS_COMPILER==WIN32C
+               SetConsoleCtrlHandler(wbreak_handler, TRUE);
+#endif
+#ifdef SIGTSTP
+               (void) LSIGNAL(SIGTSTP, stop);
+#endif
+#ifdef SIGWINCH
+               (void) LSIGNAL(SIGWINCH, winch);
+#endif
+#ifdef SIGWIND
+               (void) LSIGNAL(SIGWIND, winch);
+#endif
+#ifdef SIGQUIT
+               (void) LSIGNAL(SIGQUIT, SIG_IGN);
+#endif
+       } else
+       {
+               /*
+                * Restore signals to defaults.
+                */
+               (void) LSIGNAL(SIGINT, SIG_DFL);
+#if MSDOS_COMPILER==WIN32C
+               SetConsoleCtrlHandler(wbreak_handler, FALSE);
+#endif
+#ifdef SIGTSTP
+               (void) LSIGNAL(SIGTSTP, SIG_DFL);
+#endif
+#ifdef SIGWINCH
+               (void) LSIGNAL(SIGWINCH, SIG_IGN);
+#endif
+#ifdef SIGWIND
+               (void) LSIGNAL(SIGWIND, SIG_IGN);
+#endif
+#ifdef SIGQUIT
+               (void) LSIGNAL(SIGQUIT, SIG_DFL);
+#endif
+       }
+}
+
+/*
+ * Process any signals we have received.
+ * A received signal cause a bit to be set in "sigs".
+ */
+       public void
+psignals()
+{
+       register int tsignals;
+
+       if ((tsignals = sigs) == 0)
+               return;
+       sigs = 0;
+
+#ifdef SIGTSTP
+       if (tsignals & S_STOP)
+       {
+               /*
+                * Clean up the terminal.
+                */
+#ifdef SIGTTOU
+               LSIGNAL(SIGTTOU, SIG_IGN);
+#endif
+               clear_bot();
+               deinit();
+               flush();
+               raw_mode(0);
+#ifdef SIGTTOU
+               LSIGNAL(SIGTTOU, SIG_DFL);
+#endif
+               LSIGNAL(SIGTSTP, SIG_DFL);
+               kill(getpid(), SIGTSTP);
+               /*
+                * ... Bye bye. ...
+                * Hopefully we'll be back later and resume here...
+                * Reset the terminal and arrange to repaint the
+                * screen when we get back to the main command loop.
+                */
+               LSIGNAL(SIGTSTP, stop);
+               raw_mode(1);
+               init();
+               screen_trashed = 1;
+               tsignals |= S_WINCH;
+       }
+#endif
+#ifdef S_WINCH
+       if (tsignals & S_WINCH)
+       {
+               int old_width, old_height;
+               /*
+                * Re-execute scrsize() to read the new window size.
+                */
+               old_width = sc_width;
+               old_height = sc_height;
+               get_term();
+               if (sc_width != old_width || sc_height != old_height)
+               {
+                       wscroll = (sc_height + 1) / 2;
+                       calc_jump_sline();
+                       calc_shift_count();
+                       screen_trashed = 1;
+               }
+       }
+#endif
+       if (tsignals & S_INTERRUPT)
+       {
+               if (quit_on_intr)
+                       quit(QUIT_INTERRUPT);
+       }
+}