projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 8856c09d KB |
1 | /*- |
| 2 | * Copyright (c) 1991 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * %sccs.include.redist.c% | |
| 6 | */ | |
| 7 | ||
| 8 | #ifndef lint | |
| 8e64664b | 9 | static char sccsid[] = "@(#)term.c 5.2 (Berkeley) %G%"; |
| 8856c09d KB |
10 | #endif /* not lint */ |
| 11 | ||
| 12 | #include <sys/types.h> | |
| 13 | #include <errno.h> | |
| 14 | #include <ttyent.h> | |
| 15 | #include <unistd.h> | |
| 16 | #include <stdio.h> | |
| 17 | #include <stdlib.h> | |
| 18 | #include <string.h> | |
| 19 | #include "extern.h" | |
| 20 | ||
| 21 | char tbuf[1024]; /* Termcap entry. */ | |
| 22 | ||
| 23 | char *askuser __P((char *)); | |
| 24 | char *ttys __P((char *)); | |
| 25 | ||
| 26 | /* | |
| 27 | * Figure out what kind of terminal we're dealing with, and then read in | |
| 28 | * its termcap entry. | |
| 29 | */ | |
| 30 | char * | |
| 31 | get_termcap_entry(userarg, tcapbufp) | |
| 32 | char *userarg, **tcapbufp; | |
| 33 | { | |
| 34 | struct ttyent *t; | |
| 35 | int rval; | |
| 8e64664b | 36 | char *p, *ttype, *ttypath; |
| 8856c09d KB |
37 | |
| 38 | if (userarg) { | |
| 39 | ttype = userarg; | |
| 40 | goto found; | |
| 41 | } | |
| 42 | ||
| 43 | /* Try the environment. */ | |
| 44 | if (ttype = getenv("TERM")) | |
| 45 | goto map; | |
| 46 | ||
| 47 | /* Try ttyname(3); check for dialup or other mapping. */ | |
| 48 | if (ttypath = ttyname(STDERR_FILENO)) { | |
| 8e64664b KB |
49 | if (p = rindex(ttypath, '/')) |
| 50 | ++p; | |
| 8856c09d | 51 | else |
| 8e64664b KB |
52 | p = ttypath; |
| 53 | if ((t = getttynam(p))) { | |
| 8856c09d KB |
54 | ttype = t->ty_type; |
| 55 | goto map; | |
| 56 | } | |
| 57 | } | |
| 58 | ||
| 59 | /* If still undefined, use "unknown". */ | |
| 60 | ttype = "unknown"; | |
| 61 | ||
| 62 | map: ttype = mapped(ttype); | |
| 63 | ||
| 64 | /* | |
| 8e64664b KB |
65 | * If not a path, remove TERMCAP from the environment so we get a |
| 66 | * real entry from /etc/termcap. This prevents us from being fooled | |
| 67 | * by out of date stuff in the environment. | |
| 8856c09d | 68 | */ |
| 8e64664b KB |
69 | found: if ((p = getenv("TERMCAP")) != NULL && *p != '/') |
| 70 | unsetenv("TERMCAP"); | |
| 8856c09d KB |
71 | |
| 72 | /* | |
| 73 | * ttype now contains a pointer to the type of the terminal. | |
| 74 | * If the first character is '?', ask the user. | |
| 75 | */ | |
| 76 | if (ttype[0] == '?') | |
| 77 | ttype = askuser(ttype + 1); | |
| 78 | ||
| 79 | /* Find the termcap entry. If it doesn't exist, ask the user. */ | |
| 80 | while ((rval = tgetent(tbuf, ttype)) == 0) { | |
| 81 | (void)fprintf(stderr, | |
| 82 | "tset: terminal type %s is unknown\n", ttype); | |
| 83 | ttype = askuser(NULL); | |
| 84 | } | |
| 85 | if (rval == -1) | |
| 86 | err("termcap: %s", strerror(errno ? errno : ENOENT)); | |
| 87 | *tcapbufp = tbuf; | |
| 88 | return (ttype); | |
| 89 | } | |
| 90 | ||
| 91 | /* Prompt the user for a terminal type. */ | |
| 92 | char * | |
| 93 | askuser(dflt) | |
| 94 | char *dflt; | |
| 95 | { | |
| 96 | static char answer[256]; | |
| 97 | char *p; | |
| 98 | ||
| 99 | for (;;) { | |
| 100 | if (dflt) | |
| 101 | (void)fprintf(stderr, "Terminal type? [%s] ", dflt); | |
| 102 | else | |
| 103 | (void)fprintf(stderr, "Terminal type? "); | |
| 104 | (void)fflush(stderr); | |
| 105 | ||
| 106 | if (fgets(answer, sizeof(answer), stdin) == NULL) | |
| 107 | continue; | |
| 108 | ||
| 109 | if (p = index(answer, '\n')) | |
| 110 | *p = '\0'; | |
| 111 | return (answer[0] ? answer : dflt); | |
| 112 | } | |
| 113 | } |