diff options
Diffstat (limited to 'libps/tty.c')
| -rw-r--r-- | libps/tty.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/libps/tty.c b/libps/tty.c new file mode 100644 index 00000000..3ab72ee8 --- /dev/null +++ b/libps/tty.c @@ -0,0 +1,155 @@ +/* The ps_tty type, for per-tty info. + + Copyright (C) 1995,1996,2000 Free Software Foundation, Inc. + + Written by Miles Bader <miles@gnu.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 2, 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, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <hurd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <assert.h> +#include <hurd/term.h> + +#include "ps.h" +#include "common.h" + +#include "ps_term.h" + +/* ---------------------------------------------------------------- */ + +/* Create a ps_tty for the tty referred to by PORT, returning it in TTY. + If a memory allocation error occurs, ENOMEM is returned, otherwise 0. */ +error_t +ps_tty_create (file_t port, struct ps_tty **tty) +{ + *tty = NEW (struct ps_tty); + if (*tty == NULL) + return ENOMEM; + + (*tty)->port = port; + (*tty)->name_state = PS_TTY_NAME_PENDING; + (*tty)->short_name = NULL; + (*tty)->short_name_alloced = FALSE; + + return 0; +} + +/* Frees TTY and any resources it consumes. */ +void +ps_tty_free (struct ps_tty *tty) +{ + mach_port_deallocate(mach_task_self (), tty->port); + if (tty->name_state == PS_TTY_NAME_OK && tty->name != NULL) + free ((char *)tty->name); + if (tty->short_name_alloced) + free ((char *)tty->short_name); + free (tty); +} + +/* ---------------------------------------------------------------- */ + +/* Returns the name of the tty, or NULL if it can't be figured out. */ +const char * +ps_tty_name (struct ps_tty *tty) +{ + if (tty->name_state == PS_TTY_NAME_PENDING) + { + string_t buf; + + if (ps_term_get_nodename (tty->port, buf) != 0) + /* There is a terminal there, but we can't figure out its name. */ + tty->name_state = PS_TTY_NAME_ERROR; + else + { + tty->name = strdup (buf); + tty->name_state = (tty->name ? PS_TTY_NAME_OK : PS_TTY_NAME_ERROR); + } + } + + if (tty->name_state == PS_TTY_NAME_OK) + return tty->name; + else + return NULL; +} + +/* ---------------------------------------------------------------- */ + +struct ps_tty_abbrev +{ + const char *pfx; + const char *subst; +}; + +const struct ps_tty_abbrev ps_tty_abbrevs[] = +{ + { "/tmp/console", "oc" }, /* temp hack */ + { "/dev/console", "co" }, + { "/dev/tty", "" }, + { "/dev/pty", "" }, + { "/dev/com", "c" }, + { "/dev/", "" }, + { 0 } +}; + +/* Returns the standard abbreviated name of the tty, the whole name if there + is no standard abbreviation, or NULL if it can't be figured out. */ +const char * +ps_tty_short_name (struct ps_tty *tty) +{ + if (tty->short_name != NULL) + return tty->short_name; + else + { + const struct ps_tty_abbrev *abbrev; + const char *name = ps_tty_name (tty); + + if (name) + for (abbrev = ps_tty_abbrevs; abbrev->pfx != NULL; abbrev++) + { + const char *subst = abbrev->subst; + size_t pfx_len = strlen (abbrev->pfx); + + if (strncmp (name, abbrev->pfx, pfx_len) == 0) + { + if (name[pfx_len] == '\0') + tty->short_name = abbrev->subst; + else if (!subst || subst[0] == '\0') + tty->short_name = name + pfx_len; + else + { + size_t slen = strlen (subst); + size_t nlen = strlen (name + pfx_len) + 1; + char *n = malloc (slen + nlen); + if (n) + { + memcpy (n, subst, slen); + memcpy (&n[slen], &name[pfx_len], nlen); + tty->short_name = n; + tty->short_name_alloced = TRUE; + } + } + break; + } + } + + if (tty->short_name == NULL) + tty->short_name = name; + + return tty->short_name; + } +} |