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/* |
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* Copyright (C) 1984-2017 Mark Nudelman |
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* |
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* You may distribute under the terms of either the GNU General Public |
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* License or the Less License, as specified in the README file. |
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* |
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* For more information, see the README file. |
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*/ |
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|
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|
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/* |
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* Routines to execute other programs. |
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* Necessarily very OS dependent. |
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*/ |
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|
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#include "less.h" |
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#include <signal.h> |
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#include "position.h" |
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|
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#if MSDOS_COMPILER |
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#include <dos.h> |
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#ifdef _MSC_VER |
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#include <direct.h> |
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#define setdisk(n) _chdrive((n)+1) |
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#else |
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#include <dir.h> |
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#endif |
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#endif |
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|
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extern int screen_trashed; |
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extern IFILE curr_ifile; |
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|
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|
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#if HAVE_SYSTEM |
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|
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/* |
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* Pass the specified command to a shell to be executed. |
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* Like plain "system()", but handles resetting terminal modes, etc. |
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*/ |
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public void |
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lsystem(cmd, donemsg) |
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char *cmd; |
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char *donemsg; |
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{ |
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int inp; |
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#if HAVE_SHELL |
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char *shell; |
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char *p; |
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#endif |
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IFILE save_ifile; |
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#if MSDOS_COMPILER && MSDOS_COMPILER!=WIN32C |
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char cwd[FILENAME_MAX+1]; |
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#endif |
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|
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/* |
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* Print the command which is to be executed, |
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* unless the command starts with a "-". |
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*/ |
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if (cmd[0] == '-') |
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cmd++; |
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else |
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{ |
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clear_bot(); |
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putstr("!"); |
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putstr(cmd); |
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putstr("\n"); |
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} |
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|
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#if MSDOS_COMPILER |
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#if MSDOS_COMPILER==WIN32C |
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if (*cmd == '\0') |
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cmd = getenv("COMSPEC"); |
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#else |
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/* |
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* Working directory is global on MSDOS. |
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* The child might change the working directory, so we |
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* must save and restore CWD across calls to "system", |
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* or else we won't find our file when we return and |
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* try to "reedit_ifile" it. |
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*/ |
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getcwd(cwd, FILENAME_MAX); |
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#endif |
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#endif |
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|
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/* |
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* Close the current input file. |
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*/ |
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save_ifile = save_curr_ifile(); |
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(void) edit_ifile(NULL_IFILE); |
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|
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/* |
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* De-initialize the terminal and take out of raw mode. |
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*/ |
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deinit(); |
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flush(); /* Make sure the deinit chars get out */ |
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raw_mode(0); |
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#if MSDOS_COMPILER==WIN32C |
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close_getchr(); |
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#endif |
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|
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/* |
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* Restore signals to their defaults. |
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*/ |
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init_signals(0); |
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|
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#if HAVE_DUP |
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/* |
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* Force standard input to be the user's terminal |
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* (the normal standard input), even if less's standard input |
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* is coming from a pipe. |
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*/ |
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inp = dup(0); |
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close(0); |
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#if OS2 |
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/* The __open() system call translates "/dev/tty" to "con". */ |
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if (__open("/dev/tty", OPEN_READ) < 0) |
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#else |
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if (open("/dev/tty", OPEN_READ) < 0) |
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#endif |
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dup(inp); |
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#endif |
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|
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/* |
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* Pass the command to the system to be executed. |
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* If we have a SHELL environment variable, use |
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* <$SHELL -c "command"> instead of just <command>. |
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* If the command is empty, just invoke a shell. |
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*/ |
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#if HAVE_SHELL |
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p = NULL; |
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if ((shell = lgetenv("SHELL")) != NULL && *shell != '\0') |
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{ |
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if (*cmd == '\0') |
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p = save(shell); |
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else |
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{ |
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char *esccmd = shell_quote(cmd); |
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if (esccmd != NULL) |
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{ |
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int len = (int) (strlen(shell) + strlen(esccmd) + 5); |
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p = (char *) ecalloc(len, sizeof(char)); |
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SNPRINTF3(p, len, "%s %s %s", shell, shell_coption(), esccmd); |
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free(esccmd); |
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} |
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} |
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} |
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if (p == NULL) |
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{ |
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if (*cmd == '\0') |
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p = save("sh"); |
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else |
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p = save(cmd); |
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} |
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system(p); |
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free(p); |
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#else |
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#if MSDOS_COMPILER==DJGPPC |
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/* |
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* Make stdin of the child be in cooked mode. |
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*/ |
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setmode(0, O_TEXT); |
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/* |
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* We don't need to catch signals of the child (it |
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* also makes trouble with some DPMI servers). |
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*/ |
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__djgpp_exception_toggle(); |
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system(cmd); |
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__djgpp_exception_toggle(); |
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#else |
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system(cmd); |
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#endif |
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#endif |
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|
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#if HAVE_DUP |
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/* |
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* Restore standard input, reset signals, raw mode, etc. |
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*/ |
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close(0); |
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dup(inp); |
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close(inp); |
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#endif |
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|
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#if MSDOS_COMPILER==WIN32C |
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open_getchr(); |
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#endif |
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init_signals(1); |
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raw_mode(1); |
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if (donemsg != NULL) |
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{ |
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putstr(donemsg); |
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putstr(" (press RETURN)"); |
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get_return(); |
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putchr('\n'); |
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flush(); |
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} |
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init(); |
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screen_trashed = 1; |
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|
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#if MSDOS_COMPILER && MSDOS_COMPILER!=WIN32C |
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/* |
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* Restore the previous directory (possibly |
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* changed by the child program we just ran). |
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*/ |
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chdir(cwd); |
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#if MSDOS_COMPILER != DJGPPC |
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/* |
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* Some versions of chdir() don't change to the drive |
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* which is part of CWD. (DJGPP does this in chdir.) |
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*/ |
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if (cwd[1] == ':') |
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{ |
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if (cwd[0] >= 'a' && cwd[0] <= 'z') |
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setdisk(cwd[0] - 'a'); |
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else if (cwd[0] >= 'A' && cwd[0] <= 'Z') |
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setdisk(cwd[0] - 'A'); |
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} |
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#endif |
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#endif |
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|
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/* |
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* Reopen the current input file. |
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*/ |
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reedit_ifile(save_ifile); |
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|
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#if defined(SIGWINCH) || defined(SIGWIND) |
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/* |
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* Since we were ignoring window change signals while we executed |
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* the system command, we must assume the window changed. |
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* Warning: this leaves a signal pending (in "sigs"), |
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* so psignals() should be called soon after lsystem(). |
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*/ |
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winch(0); |
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#endif |
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} |
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|
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#endif |
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|
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#if PIPEC |
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|
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/* |
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* Pipe a section of the input file into the given shell command. |
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* The section to be piped is the section "between" the current |
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* position and the position marked by the given letter. |
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* |
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* If the mark is after the current screen, the section between |
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* the top line displayed and the mark is piped. |
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* If the mark is before the current screen, the section between |
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* the mark and the bottom line displayed is piped. |
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* If the mark is on the current screen, or if the mark is ".", |
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* the whole current screen is piped. |
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*/ |
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public int |
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pipe_mark(c, cmd) |
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int c; |
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char *cmd; |
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{ |
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POSITION mpos, tpos, bpos; |
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|
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/* |
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* mpos = the marked position. |
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* tpos = top of screen. |
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* bpos = bottom of screen. |
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*/ |
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mpos = markpos(c); |
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if (mpos == NULL_POSITION) |
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return (-1); |
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tpos = position(TOP); |
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if (tpos == NULL_POSITION) |
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tpos = ch_zero(); |
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bpos = position(BOTTOM); |
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|
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if (c == '.') |
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return (pipe_data(cmd, tpos, bpos)); |
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else if (mpos <= tpos) |
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return (pipe_data(cmd, mpos, bpos)); |
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else if (bpos == NULL_POSITION) |
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return (pipe_data(cmd, tpos, bpos)); |
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else |
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return (pipe_data(cmd, tpos, mpos)); |
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} |
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|
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/* |
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* Create a pipe to the given shell command. |
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* Feed it the file contents between the positions spos and epos. |
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*/ |
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public int |
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pipe_data(cmd, spos, epos) |
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char *cmd; |
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POSITION spos; |
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POSITION epos; |
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{ |
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FILE *f; |
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int c; |
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extern FILE *popen(); |
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|
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/* |
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* This is structured much like lsystem(). |
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* Since we're running a shell program, we must be careful |
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* to perform the necessary deinitialization before running |
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* the command, and reinitialization after it. |
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*/ |
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if (ch_seek(spos) != 0) |
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{ |
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error("Cannot seek to start position", NULL_PARG); |
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return (-1); |
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} |
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|
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if ((f = popen(cmd, "w")) == NULL) |
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{ |
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error("Cannot create pipe", NULL_PARG); |
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return (-1); |
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} |
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clear_bot(); |
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putstr("!"); |
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putstr(cmd); |
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putstr("\n"); |
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|
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deinit(); |
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flush(); |
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raw_mode(0); |
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init_signals(0); |
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#if MSDOS_COMPILER==WIN32C |
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close_getchr(); |
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#endif |
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#ifdef SIGPIPE |
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LSIGNAL(SIGPIPE, SIG_IGN); |
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#endif |
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|
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c = EOI; |
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while (epos == NULL_POSITION || spos++ <= epos) |
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{ |
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/* |
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* Read a character from the file and give it to the pipe. |
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*/ |
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c = ch_forw_get(); |
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if (c == EOI) |
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break; |
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if (putc(c, f) == EOF) |
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break; |
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} |
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|
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/* |
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* Finish up the last line. |
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*/ |
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while (c != '\n' && c != EOI ) |
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{ |
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c = ch_forw_get(); |
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if (c == EOI) |
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break; |
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if (putc(c, f) == EOF) |
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break; |
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} |
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|
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pclose(f); |
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|
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#ifdef SIGPIPE |
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LSIGNAL(SIGPIPE, SIG_DFL); |
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#endif |
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#if MSDOS_COMPILER==WIN32C |
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open_getchr(); |
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#endif |
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init_signals(1); |
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raw_mode(1); |
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init(); |
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screen_trashed = 1; |
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#if defined(SIGWINCH) || defined(SIGWIND) |
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/* {{ Probably don't need this here. }} */ |
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winch(0); |
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#endif |
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return (0); |
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} |
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|
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#endif |
