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Annotation of embedaddon/sudo/common/term.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (c) 2011 Todd C. Miller <Todd.Miller@courtesan.com>
        !             3:  *
        !             4:  * Permission to use, copy, modify, and distribute this software for any
        !             5:  * purpose with or without fee is hereby granted, provided that the above
        !             6:  * copyright notice and this permission notice appear in all copies.
        !             7:  *
        !             8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !             9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            15:  */
        !            16: 
        !            17: #include <config.h>
        !            18: 
        !            19: #include <sys/types.h>
        !            20: #include <sys/param.h>
        !            21: #include <stdio.h>
        !            22: #ifdef STDC_HEADERS
        !            23: # include <stdlib.h>
        !            24: # include <stddef.h>
        !            25: #else
        !            26: # ifdef HAVE_STDLIB_H
        !            27: #  include <stdlib.h>
        !            28: # endif
        !            29: #endif /* STDC_HEADERS */
        !            30: #ifdef HAVE_STRING_H
        !            31: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
        !            32: #  include <memory.h>
        !            33: # endif
        !            34: # include <string.h>
        !            35: #endif /* HAVE_STRING_H */
        !            36: #ifdef HAVE_STRINGS_H
        !            37: # include <strings.h>
        !            38: #endif /* HAVE_STRINGS_H */
        !            39: #include <termios.h>
        !            40: 
        !            41: #include "missing.h"
        !            42: 
        !            43: #ifndef TCSASOFT
        !            44: # define TCSASOFT      0
        !            45: #endif
        !            46: #ifndef ECHONL
        !            47: # define ECHONL                0
        !            48: #endif
        !            49: #ifndef IEXTEN
        !            50: # define IEXTEN                0
        !            51: #endif
        !            52: #ifndef IUCLC
        !            53: # define IUCLC         0
        !            54: #endif
        !            55: 
        !            56: #ifndef _POSIX_VDISABLE
        !            57: # ifdef VDISABLE
        !            58: #  define _POSIX_VDISABLE      VDISABLE
        !            59: # else
        !            60: #  define _POSIX_VDISABLE      0
        !            61: # endif
        !            62: #endif
        !            63: 
        !            64: static struct termios term, oterm;
        !            65: static int changed;
        !            66: int term_erase;
        !            67: int term_kill;
        !            68: 
        !            69: int
        !            70: term_restore(int fd, int flush)
        !            71: {
        !            72:     if (changed) {
        !            73:        int flags = TCSASOFT;
        !            74:        flags |= flush ? TCSAFLUSH : TCSADRAIN;
        !            75:        if (tcsetattr(fd, flags, &oterm) != 0)
        !            76:            return 0;
        !            77:        changed = 0;
        !            78:     }
        !            79:     return 1;
        !            80: }
        !            81: 
        !            82: int
        !            83: term_noecho(int fd)
        !            84: {
        !            85:     if (!changed && tcgetattr(fd, &oterm) != 0)
        !            86:        return 0;
        !            87:     (void) memcpy(&term, &oterm, sizeof(term));
        !            88:     CLR(term.c_lflag, ECHO|ECHONL);
        !            89: #ifdef VSTATUS
        !            90:     term.c_cc[VSTATUS] = _POSIX_VDISABLE;
        !            91: #endif
        !            92:     if (tcsetattr(fd, TCSADRAIN|TCSASOFT, &term) == 0) {
        !            93:        changed = 1;
        !            94:        return 1;
        !            95:     }
        !            96:     return 0;
        !            97: }
        !            98: 
        !            99: int
        !           100: term_raw(int fd, int isig)
        !           101: {
        !           102:     struct termios term;
        !           103: 
        !           104:     if (!changed && tcgetattr(fd, &oterm) != 0)
        !           105:        return 0;
        !           106:     (void) memcpy(&term, &oterm, sizeof(term));
        !           107:     /* Set terminal to raw mode */
        !           108:     term.c_cc[VMIN] = 1;
        !           109:     term.c_cc[VTIME] = 0;
        !           110:     CLR(term.c_iflag, ICRNL | IGNCR | INLCR | IUCLC | IXON);
        !           111:     CLR(term.c_oflag, OPOST);
        !           112:     CLR(term.c_lflag, ECHO | ICANON | ISIG | IEXTEN);
        !           113:     if (isig)
        !           114:        SET(term.c_lflag, ISIG);
        !           115:     if (tcsetattr(fd, TCSADRAIN|TCSASOFT, &term) == 0) {
        !           116:        changed = 1;
        !           117:        return 1;
        !           118:     }
        !           119:     return 0;
        !           120: }
        !           121: 
        !           122: int
        !           123: term_cbreak(int fd)
        !           124: {
        !           125:     if (!changed && tcgetattr(fd, &oterm) != 0)
        !           126:        return 0;
        !           127:     (void) memcpy(&term, &oterm, sizeof(term));
        !           128:     /* Set terminal to half-cooked mode */
        !           129:     term.c_cc[VMIN] = 1;
        !           130:     term.c_cc[VTIME] = 0;
        !           131:     CLR(term.c_lflag, ECHO | ECHONL | ICANON | IEXTEN);
        !           132:     SET(term.c_lflag, ISIG);
        !           133: #ifdef VSTATUS
        !           134:     term.c_cc[VSTATUS] = _POSIX_VDISABLE;
        !           135: #endif
        !           136:     if (tcsetattr(fd, TCSADRAIN|TCSASOFT, &term) == 0) {
        !           137:        term_erase = term.c_cc[VERASE];
        !           138:        term_kill = term.c_cc[VKILL];
        !           139:        changed = 1;
        !           140:        return 1;
        !           141:     }
        !           142:     return 0;
        !           143: }
        !           144: 
        !           145: int
        !           146: term_copy(int src, int dst)
        !           147: {
        !           148:     struct termios tt;
        !           149: 
        !           150:     if (tcgetattr(src, &tt) != 0)
        !           151:        return 0;
        !           152:     if (tcsetattr(dst, TCSANOW|TCSASOFT, &tt) != 0)
        !           153:        return 0;
        !           154:     return 1;
        !           155: }