| 1 | /*
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| 2 | * termcap.c V1.1 20/7/87 agc Joypace Ltd
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| 3 | *
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| 4 | * Copyright Joypace Ltd, London, UK, 1987. All rights reserved.
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| 5 | * This file may be freely distributed provided that this notice
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| 6 | * remains attached.
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| 7 | *
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| 8 | * A public domain implementation of the termcap(3) routines.
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| 9 | *
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| 10 | *
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| 11 | *
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| 12 | * Klamer Schutte V1.2 Nov. 1988
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| 13 | *
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| 14 | * - Can match multiple terminal names [tgetent]
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| 15 | * - Removal of **area assignments [tgetstr]
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| 16 | *
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| 17 | * Terrence W. Holm V1.3 May, Sep, Oct. 1988
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| 18 | *
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| 19 | * - Correct when TERM != name and TERMCAP is defined [tgetent]
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| 20 | * - Correct the comparison for the terminal name [tgetent]
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| 21 | * - Correct the value of ^x escapes [tgetstr]
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| 22 | * - Added %r to reverse row/column [tgoto]
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| 23 | * - Fixed end of definition test [tgetnum/flag/str]
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| 24 | *
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| 25 | * Terrence W. Holm V1.4 Jan. 1989
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| 26 | *
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| 27 | * - Incorporated Klamer's V1.2 fixes into V1.3
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| 28 | * - Added %d, (old %d is now %2) [tgoto]
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| 29 | * - Allow '#' comments in definition file [tgetent]
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| 30 | */
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| 31 |
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| 32 | #include <lib.h>
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| 33 | #include <termcap.h>
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| 34 | #include <ctype.h>
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| 35 | #include <stdlib.h>
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| 36 | #include <string.h>
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| 37 | #include <stdio.h>
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| 38 |
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| 39 | char *capab = (char *)NULL; /* the capability itself */
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| 40 |
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| 41 | #if 0
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| 42 | /* The following are not yet used. */
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| 43 | extern short ospeed; /* output speed */
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| 44 | extern char PC; /* padding character */
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| 45 | extern char *BC; /* back cursor movement */
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| 46 | extern char *UP; /* up cursor movement */
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| 47 | #endif
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| 48 |
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| 49 | /*
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| 50 | * tgetent - get the termcap entry for terminal name, and put it
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| 51 | * in bp (which must be an array of 1024 chars). Returns 1 if
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| 52 | * termcap entry found, 0 if not found, and -1 if file not found.
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| 53 | */
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| 54 |
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| 55 | int tgetent(bp, name)
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| 56 | char *bp;
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| 57 | char *name;
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| 58 | {
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| 59 | FILE *fp;
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| 60 | char *file;
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| 61 | char *term;
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| 62 | short len = strlen(name);
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| 63 |
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| 64 | capab = bp;
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| 65 |
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| 66 | /* If TERMCAP begins with a '/' then use TERMCAP as the path */
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| 67 | /* Name of the termcap definitions file. If TERMCAP is a */
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| 68 | /* Definition and TERM equals "name" then use TERMCAP as the */
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| 69 | /* Definition. Otherwise use "/etc/termcap" as the path name. */
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| 70 |
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| 71 | if ((file = getenv("TERMCAP")) == (char *)NULL)
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| 72 | file = "/etc/termcap";
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| 73 | else if (*file != '/')
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| 74 | if ((term = getenv("TERM")) != (char *)NULL && strcmp(term, name) == 0) {
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| 75 | *bp = '\0';
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| 76 | strncat(bp, file, 1023);
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| 77 | return(1);
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| 78 | } else
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| 79 | file = "/etc/termcap";
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| 80 |
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| 81 | if ((fp = fopen(file, "r")) == (FILE *) NULL) {
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| 82 | capab = (char *)NULL; /* no valid termcap */
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| 83 | return(-1);
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| 84 | }
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| 85 | for (;;) {
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| 86 | /* Read in each definition */
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| 87 | int def_len = 0;
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| 88 | char *cp = bp;
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| 89 |
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| 90 | do {
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| 91 | if (fgets(&bp[def_len], (unsigned int)(1024 - def_len), fp) == (char *)NULL) {
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| 92 | fclose(fp);
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| 93 | capab = (char *)NULL; /* no valid termcap */
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| 94 | return(0);
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| 95 | }
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| 96 | def_len = strlen(bp) - 2;
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| 97 | } while (bp[def_len] == '\\');
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| 98 |
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| 99 | while (isspace(*cp)) cp++;
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| 100 |
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| 101 | /* Comment lines start with a '#' */
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| 102 | if (*cp == '#') continue;
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| 103 |
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| 104 | /* See if any of the terminal names in this definition */
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| 105 | /* Match "name". */
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| 106 |
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| 107 | do {
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| 108 | if (strncmp(name, cp, len) == 0 &&
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| 109 | (cp[len] == '|' || cp[len] == ':')) {
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| 110 | fclose(fp);
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| 111 | return(1);
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| 112 | }
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| 113 | while ((*cp) && (*cp != '|') && (*cp != ':')) cp++;
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| 114 | } while (*cp++ == '|');
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| 115 | }
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| 116 | }
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| 117 |
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| 118 |
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| 119 | /*
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| 120 | * tgetnum - get the numeric terminal capability corresponding
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| 121 | * to id. Returns the value, -1 if invalid.
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| 122 | */
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| 123 |
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| 124 | int tgetnum(id)
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| 125 | char *id;
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| 126 | {
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| 127 | register char *cp = capab;
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| 128 |
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| 129 | if (cp == (char *)NULL || id == (char *)NULL) return(-1);
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| 130 |
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| 131 | for (;;) {
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| 132 | while (*cp++ != ':')
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| 133 | if (cp[-1] == '\0') return(-1);
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| 134 |
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| 135 | while (isspace(*cp)) cp++;
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| 136 |
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| 137 | if (strncmp(cp, id, 2) == 0 && cp[2] == '#') return(atoi(cp + 3));
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| 138 | }
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| 139 | }
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| 140 |
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| 141 |
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| 142 | /*
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| 143 | * tgetflag - get the boolean flag corresponding to id. Returns -1
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| 144 | * if invalid, 0 if the flag is not in termcap entry, or 1 if it is
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| 145 | * present.
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| 146 | */
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| 147 |
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| 148 | int tgetflag(id)
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| 149 | char *id;
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| 150 | {
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| 151 | register char *cp = capab;
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| 152 |
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| 153 | if (cp == (char *)NULL || id == (char *)NULL) return(-1);
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| 154 |
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| 155 | for (;;) {
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| 156 | while (*cp++ != ':')
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| 157 | if (cp[-1] == '\0') return(0);
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| 158 |
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| 159 | while (isspace(*cp)) cp++;
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| 160 |
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| 161 | if (strncmp(cp, id, 2) == 0) return(1);
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| 162 | }
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| 163 | }
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| 164 |
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| 165 |
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| 166 | /*
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| 167 | * tgetstr - get the string capability corresponding to id and place
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| 168 | * it in area (advancing area at same time). Expand escape sequences
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| 169 | * etc. Returns the string, or NULL if it can't do it.
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| 170 | */
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| 171 |
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| 172 | char *tgetstr(id, area)
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| 173 | char *id;
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| 174 | char **area;
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| 175 | {
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| 176 | register char *cp = capab;
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| 177 | register char *wsp = *area; /* workspace pointer */
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| 178 |
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| 179 | if (cp == (char *)NULL || id == (char *)NULL) return((char *)NULL);
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| 180 |
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| 181 | for (;;) {
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| 182 | while (*cp++ != ':')
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| 183 | if (cp[-1] == '\0') return((char *)NULL);
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| 184 |
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| 185 | while (isspace(*cp)) cp++;
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| 186 |
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| 187 | if (strncmp(cp, id, 2) == 0 && cp[2] == '=') {
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| 188 | for (cp += 3; *cp && *cp != ':'; wsp++, cp++) switch (*cp) {
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| 189 | case '^':
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| 190 | *wsp = *++cp - '@';
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| 191 | break;
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| 192 |
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| 193 | case '\\':
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| 194 | switch (*++cp) {
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| 195 | case 'E':
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| 196 | *wsp = '\033';
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| 197 | break;
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| 198 | case 'n':
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| 199 | *wsp = '\n';
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| 200 | break;
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| 201 | case 'r':
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| 202 | *wsp = '\r';
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| 203 | break;
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| 204 | case 't':
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| 205 | *wsp = '\t';
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| 206 | break;
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| 207 | case 'b':
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| 208 | *wsp = '\b';
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| 209 | break;
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| 210 | case 'f':
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| 211 | *wsp = '\f';
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| 212 | break;
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| 213 | case '0':
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| 214 | case '1':
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| 215 | case '2':
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| 216 | case '3':
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| 217 | {
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| 218 | int i;
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| 219 | int t = 0;
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| 220 | for (i = 0; i < 3 &&
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| 221 | isdigit(*cp); ++i, ++cp)
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| 222 | t = t * 8 + *cp - '0';
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| 223 | *wsp = t;
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| 224 | cp--;
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| 225 | break;
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| 226 | }
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| 227 | default:
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| 228 | *wsp = *cp;
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| 229 | }
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| 230 | break;
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| 231 |
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| 232 | default: *wsp = *cp;
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| 233 | }
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| 234 |
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| 235 | *wsp++ = '\0';
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| 236 |
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| 237 | {
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| 238 | char *ret = *area;
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| 239 | *area = wsp;
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| 240 | return(ret);
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| 241 | }
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| 242 | }
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| 243 | } /* end for(;;) */
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| 244 | }
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| 245 |
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| 246 |
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| 247 |
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| 248 | /*
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| 249 | * tgoto - given the cursor motion string cm, make up the string
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| 250 | * for the cursor to go to (destcol, destline), and return the string.
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| 251 | * Returns "OOPS" if something's gone wrong, or the string otherwise.
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| 252 | */
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| 253 |
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| 254 | char *tgoto(cm, destcol, destline)
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| 255 | char *cm;
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| 256 | int destcol;
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| 257 | int destline;
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| 258 | {
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| 259 | PRIVATE char ret[24];
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| 260 | char *rp = ret;
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| 261 | int incr = 0;
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| 262 | int argno = 0;
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| 263 | int numval;
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| 264 |
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| 265 | for (; *cm; cm++) {
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| 266 | if (*cm == '%') {
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| 267 | switch (*++cm) {
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| 268 | case 'i': incr = 1; break;
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| 269 |
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| 270 | case 'r': argno = 1; break;
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| 271 |
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| 272 | case '+':
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| 273 | numval = (argno == 0 ? destline : destcol);
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| 274 | *rp++ = numval + incr + *++cm;
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| 275 | argno = 1 - argno;
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| 276 | break;
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| 277 |
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| 278 | case '2':
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| 279 | numval = (argno == 0 ? destline : destcol);
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| 280 | numval = (numval + incr) % 100;
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| 281 | *rp++ = '0' + (numval / 10);
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| 282 | *rp++ = '0' + (numval % 10);
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| 283 | argno = 1 - argno;
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| 284 | break;
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| 285 |
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| 286 | case 'd':
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| 287 | numval = (argno == 0 ? destline : destcol);
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| 288 | numval = (numval + incr) % 1000;
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| 289 | if (numval > 99) *rp++ = '0' + (numval / 100);
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| 290 | if (numval > 9) *rp++ = '0' + (numval / 10) % 10;
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| 291 | *rp++ = '0' + (numval % 10);
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| 292 | argno = 1 - argno;
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| 293 | break;
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| 294 |
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| 295 | case '%': *rp++ = '%'; break;
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| 296 |
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| 297 | default: return("OOPS");
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| 298 | }
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| 299 |
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| 300 | } else
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| 301 | *rp++ = *cm;
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| 302 | }
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| 303 |
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| 304 | *rp = '\0';
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| 305 | return(ret);
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| 306 | }
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| 307 |
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| 308 |
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| 309 |
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| 310 | /*
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| 311 | * tputs - put the string cp out onto the terminal, using the function
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| 312 | * outc. This should do padding for the terminal, but I can't find a
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| 313 | * terminal that needs padding at the moment...
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| 314 | */
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| 315 |
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| 316 | int tputs(cp, affcnt, outc)
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| 317 | register char *cp;
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| 318 | int affcnt;
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| 319 | _PROTOTYPE( void (*outc), (int ch));
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| 320 | {
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| 321 | if (cp == (char *)NULL) return(1);
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| 322 | /* Do any padding interpretation - left null for MINIX just now */
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| 323 | while (*cp) (*outc) (*cp++);
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| 324 | return(1);
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| 325 | }
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