1 /* 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)tty.c 8.2 (Berkeley) 6/6/93 30 * $FreeBSD: src/usr.bin/mail/tty.c,v 1.2.8.3 2003/01/06 05:46:04 mikeh Exp $ 31 * $DragonFly: src/usr.bin/mail/tty.c,v 1.5 2004/09/08 03:01:11 joerg Exp $ 32 */ 33 34 /* 35 * Mail -- a mail program 36 * 37 * Generally useful tty stuff. 38 */ 39 40 #include "rcv.h" 41 #include "extern.h" 42 43 static cc_t c_erase; /* Current erase char */ 44 static cc_t c_kill; /* Current kill char */ 45 static jmp_buf rewrite; /* Place to go when continued */ 46 static jmp_buf intjmp; /* Place to go when interrupted */ 47 48 /* 49 * Read all relevant header fields. 50 */ 51 52 int 53 grabh(struct header *hp, int gflags) 54 { 55 struct termios ttybuf; 56 sig_t saveint; 57 sig_t savetstp; 58 sig_t savettou; 59 sig_t savettin; 60 int errs; 61 int extproc, flag; 62 63 savetstp = signal(SIGTSTP, SIG_DFL); 64 savettou = signal(SIGTTOU, SIG_DFL); 65 savettin = signal(SIGTTIN, SIG_DFL); 66 errs = 0; 67 if (tcgetattr(fileno(stdin), &ttybuf) < 0) { 68 warn("tcgetattr(stdin)"); 69 return (-1); 70 } 71 c_erase = ttybuf.c_cc[VERASE]; 72 c_kill = ttybuf.c_cc[VKILL]; 73 extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0); 74 if (extproc) { 75 flag = 0; 76 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 77 warn("TIOCEXT: off"); 78 } 79 if (setjmp(intjmp)) 80 goto out; 81 saveint = signal(SIGINT, ttyint); 82 if (gflags & GTO) { 83 hp->h_to = 84 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 85 } 86 if (gflags & GSUBJECT) { 87 hp->h_subject = readtty("Subject: ", hp->h_subject); 88 } 89 if (gflags & GCC) { 90 hp->h_cc = 91 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 92 } 93 if (gflags & GBCC) { 94 hp->h_bcc = 95 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 96 } 97 out: 98 signal(SIGTSTP, savetstp); 99 signal(SIGTTOU, savettou); 100 signal(SIGTTIN, savettin); 101 if (extproc) { 102 flag = 1; 103 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 104 warn("TIOCEXT: on"); 105 } 106 signal(SIGINT, saveint); 107 return (errs); 108 } 109 110 /* 111 * Read up a header from standard input. 112 * The source string has the preliminary contents to 113 * be read. 114 * 115 */ 116 117 char * 118 readtty(const char *pr, char *src) 119 { 120 char ch, canonb[BUFSIZ]; 121 int c; 122 char *cp, *cp2; 123 124 fputs(pr, stdout); 125 fflush(stdout); 126 if (src != NULL && strlen(src) > BUFSIZ - 2) { 127 printf("too long to edit\n"); 128 return (src); 129 } 130 cp = src == NULL ? "" : src; 131 while ((c = *cp++) != '\0') { 132 if ((c_erase != _POSIX_VDISABLE && c == c_erase) || 133 (c_kill != _POSIX_VDISABLE && c == c_kill)) { 134 ch = '\\'; 135 ioctl(0, TIOCSTI, &ch); 136 } 137 ch = c; 138 ioctl(0, TIOCSTI, &ch); 139 } 140 cp = canonb; 141 *cp = '\0'; 142 cp2 = cp; 143 while (cp2 < canonb + BUFSIZ) 144 *cp2++ = '\0'; 145 cp2 = cp; 146 if (setjmp(rewrite)) 147 goto redo; 148 signal(SIGTSTP, ttystop); 149 signal(SIGTTOU, ttystop); 150 signal(SIGTTIN, ttystop); 151 clearerr(stdin); 152 while (cp2 < canonb + BUFSIZ) { 153 c = getc(stdin); 154 if (c == EOF || c == '\n') 155 break; 156 *cp2++ = c; 157 } 158 *cp2 = '\0'; 159 signal(SIGTSTP, SIG_DFL); 160 signal(SIGTTOU, SIG_DFL); 161 signal(SIGTTIN, SIG_DFL); 162 if (c == EOF && ferror(stdin)) { 163 redo: 164 cp = strlen(canonb) > 0 ? canonb : NULL; 165 clearerr(stdin); 166 return (readtty(pr, cp)); 167 } 168 if (equal("", canonb)) 169 return (NULL); 170 return (savestr(canonb)); 171 } 172 173 /* 174 * Receipt continuation. 175 */ 176 void 177 ttystop(int s) 178 { 179 sig_t old_action = signal(s, SIG_DFL); 180 sigset_t nset; 181 182 sigemptyset(&nset); 183 sigaddset(&nset, s); 184 sigprocmask(SIG_BLOCK, &nset, NULL); 185 kill(0, s); 186 sigprocmask(SIG_UNBLOCK, &nset, NULL); 187 signal(s, old_action); 188 longjmp(rewrite, 1); 189 } 190 191 /*ARGSUSED*/ 192 void 193 ttyint(int s) 194 { 195 longjmp(intjmp, 1); 196 } 197