| 1 | /*
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| 2 | * termcap.c 1.1 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 | * Made fully functional by Ceriel J.H. Jacobs.
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| 11 | *
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| 12 | * BUGS:
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| 13 | * - does not check termcap entry sizes
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| 14 | * - not fully tested
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| 15 | */
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| 16 |
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| 17 | #define CAPABLEN 2
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| 18 |
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| 19 | #define ISSPACE(c) ((c) == ' ' || (c) == '\t' || (c) == '\r' || (c) == '\n')
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| 20 | #define ISDIGIT(x) ((x) >= '0' && (x) <= '9')
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| 21 |
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| 22 | short ospeed = 0; /* output speed */
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| 23 | char PC = 0; /* padding character */
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| 24 | char *BC = 0; /* back cursor movement */
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| 25 | char *UP = 0; /* up cursor movement */
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| 26 |
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| 27 | static char *capab = 0; /* the capability itself */
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| 28 | static int check_for_tc();
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| 29 | static int match_name();
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| 30 |
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| 31 | #define NULL 0
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| 32 |
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| 33 | /* Some things from C-library, needed here because the C-library is not
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| 34 | loaded with Modula-2 programs
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| 35 | */
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| 36 |
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| 37 | static char *
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| 38 | strcat(s1, s2)
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| 39 | register char *s1, *s2;
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| 40 | {
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| 41 | /* Append s2 to the end of s1. */
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| 42 |
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| 43 | char *original = s1;
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| 44 |
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| 45 | /* Find the end of s1. */
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| 46 | while (*s1 != 0) s1++;
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| 47 |
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| 48 | /* Now copy s2 to the end of s1. */
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| 49 | while (*s1++ = *s2++) /* nothing */ ;
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| 50 | return(original);
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| 51 | }
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| 52 |
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| 53 | static char *
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| 54 | strcpy(s1, s2)
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| 55 | register char *s1, *s2;
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| 56 | {
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| 57 | /* Copy s2 to s1. */
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| 58 | char *original = s1;
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| 59 |
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| 60 | while (*s1++ = *s2++) /* nothing */;
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| 61 | return(original);
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| 62 | }
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| 63 |
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| 64 | static int
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| 65 | strlen(s)
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| 66 | char *s;
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| 67 | {
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| 68 | /* Return length of s. */
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| 69 |
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| 70 | char *original = s;
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| 71 |
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| 72 | while (*s != 0) s++;
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| 73 | return(s - original);
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| 74 | }
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| 75 |
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| 76 | static int
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| 77 | strcmp(s1, s2)
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| 78 | register char *s1, *s2;
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| 79 | {
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| 80 | /* Compare 2 strings. */
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| 81 |
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| 82 | for(;;) {
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| 83 | if (*s1 != *s2) {
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| 84 | if (!*s1) return -1;
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| 85 | if (!*s2) return 1;
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| 86 | return(*s1 - *s2);
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| 87 | }
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| 88 | if (*s1++ == 0) return(0);
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| 89 | s2++;
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| 90 | }
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| 91 | }
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| 92 |
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| 93 | static int
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| 94 | strncmp(s1, s2, n)
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| 95 | register char *s1, *s2;
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| 96 | int n;
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| 97 | {
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| 98 | /* Compare two strings, but at most n characters. */
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| 99 |
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| 100 | while (n-- > 0) {
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| 101 | if (*s1 != *s2) {
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| 102 | if (!*s1) return -1;
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| 103 | if (!*s2) return 1;
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| 104 | return(*s1 - *s2);
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| 105 | }
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| 106 | if (*s1++ == 0) break;
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| 107 | s2++;
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| 108 | }
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| 109 | return 0;
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| 110 | }
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| 111 |
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| 112 | static char *
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| 113 | getenv(name)
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| 114 | register char *name;
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| 115 | {
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| 116 | extern char ***_penviron;
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| 117 | register char **v = *_penviron, *p, *q;
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| 118 |
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| 119 | if (v == 0 || name == 0) return 0;
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| 120 | while ((p = *v++) != 0) {
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| 121 | q = name;
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| 122 | while (*q && *q++ == *p++) /* nothing */ ;
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| 123 | if (*q || *p != '=') continue;
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| 124 | return(p+1);
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| 125 | }
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| 126 | return(0);
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| 127 | }
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| 128 |
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| 129 | static char *
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| 130 | fgets(buf, count, fd)
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| 131 | char *buf;
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| 132 | {
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| 133 | static char bf[1024];
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| 134 | static int cnt = 0;
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| 135 | static char *pbf = &bf[0];
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| 136 | register char *c = buf;
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| 137 |
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| 138 |
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| 139 | while (--count) {
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| 140 | if (pbf >= &bf[cnt]) {
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| 141 | if ((cnt = read(fd, bf, 1024)) <= 0) {
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| 142 | if (c == buf) return (char *) NULL;
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| 143 | *c = 0;
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| 144 | return buf;
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| 145 | }
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| 146 | pbf = &bf[0];
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| 147 | }
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| 148 | *c = *pbf++;
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| 149 | if (*c++ == '\n') {
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| 150 | *c = 0;
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| 151 | return buf;
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| 152 | }
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| 153 | }
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| 154 | *c = 0;
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| 155 | return buf;
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| 156 | }
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| 157 |
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| 158 | /*
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| 159 | * tgetent - get the termcap entry for terminal name, and put it
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| 160 | * in bp (which must be an array of 1024 chars). Returns 1 if
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| 161 | * termcap entry found, 0 if not found, and -1 if file not found.
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| 162 | */
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| 163 | int
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| 164 | tgetent(bp, name)
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| 165 | char *bp;
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| 166 | char *name;
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| 167 | {
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| 168 | int fp;
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| 169 | char *file;
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| 170 | char *cp;
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| 171 | short len = strlen(name);
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| 172 | char buf[1024];
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| 173 |
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| 174 | capab = bp;
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| 175 | if ((file = getenv("TERMCAP")) != (char *) NULL) {
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| 176 | if (*file != '/' &&
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| 177 | (cp = getenv("TERM")) != NULL && strcmp(name, cp) == 0) {
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| 178 | (void) strcpy(bp, file);
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| 179 | return(1);
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| 180 | }
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| 181 | else file = "/etc/termcap";
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| 182 | } else
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| 183 | file = "/etc/termcap";
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| 184 | if ((fp = open(file, 0)) < 0) {
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| 185 | capab = 0;
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| 186 | return(-1);
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| 187 | }
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| 188 | while (fgets(buf, 1024, fp) != NULL) {
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| 189 | if (buf[0] == '#') continue;
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| 190 | while (*(cp = &buf[strlen(buf) - 2]) == '\\')
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| 191 | if (fgets(cp, 1024, fp) == NULL)
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| 192 | return (0);
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| 193 | if (match_name(buf, name)) {
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| 194 | strcpy(bp, buf);
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| 195 | close(fp);
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| 196 | if(check_for_tc() == 0) {
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| 197 | capab = 0;
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| 198 | return 0;
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| 199 | }
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| 200 | return 1;
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| 201 | }
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| 202 | }
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| 203 | capab = 0;
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| 204 | close(fp);
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| 205 | return(0);
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| 206 | }
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| 207 |
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| 208 | /*
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| 209 | * Compare the terminal name with each termcap entry name; Return 1 if a
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| 210 | * match is found.
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| 211 | */
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| 212 | static int
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| 213 | match_name(buf, name)
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| 214 | char *buf;
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| 215 | char *name;
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| 216 | {
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| 217 | register char *tp = buf;
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| 218 | register char *np;
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| 219 |
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| 220 | for (;;) {
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| 221 | for (np = name; *np && *tp == *np; np++, tp++) { }
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| 222 | if (*np == 0 && (*tp == '|' || *tp == ':' || *tp == 0))
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| 223 | return(1);
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| 224 | while (*tp != 0 && *tp != '|' && *tp != ':') tp++;
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| 225 | if (*tp++ != '|') return (0);
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| 226 | }
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| 227 | }
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| 228 |
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| 229 | /*
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| 230 | * Handle tc= definitions recursively.
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| 231 | */
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| 232 | static int
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| 233 | check_for_tc()
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| 234 | {
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| 235 | static int count = 0;
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| 236 | char *savcapab = capab;
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| 237 | char buf[1024];
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| 238 | char terminalname[128];
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| 239 | register char *p = capab + strlen(capab) - 2, *q;
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| 240 |
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| 241 | while (*p != ':')
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| 242 | if (--p < capab)
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| 243 | return(0); /* no : in termcap entry */
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| 244 | if (p[1] != 't' || p[2] != 'c')
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| 245 | return(1);
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| 246 | if (count > 16) {
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| 247 | return(0); /* recursion in tc= definitions */
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| 248 | }
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| 249 | count++;
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| 250 | strcpy(terminalname, &p[4]);
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| 251 | q = terminalname;
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| 252 | while (*q && *q != ':') q++;
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| 253 | *q = 0;
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| 254 | if (tgetent(buf, terminalname) != 1) {
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| 255 | --count;
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| 256 | return(0);
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| 257 | }
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| 258 | --count;
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| 259 | for (q = buf; *q && *q != ':'; q++) { }
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| 260 | strcpy(p, q);
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| 261 | capab = savcapab;
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| 262 | return(1);
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| 263 | }
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| 264 |
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| 265 | /*
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| 266 | * tgetnum - get the numeric terminal capability corresponding
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| 267 | * to id. Returns the value, -1 if invalid.
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| 268 | */
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| 269 | int
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| 270 | tgetnum(id)
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| 271 | char *id;
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| 272 | {
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| 273 | char *cp;
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| 274 | int ret;
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| 275 |
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| 276 | if ((cp = capab) == NULL || id == NULL || *cp == 0)
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| 277 | return(-1);
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| 278 | while (*++cp && *cp != ':')
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| 279 | ;
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| 280 | while (*cp) {
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| 281 | cp++;
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| 282 | while (ISSPACE(*cp))
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| 283 | cp++;
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| 284 | if (strncmp(cp, id, CAPABLEN) == 0) {
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| 285 | while (*cp && *cp != ':' && *cp != '#')
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| 286 | cp++;
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| 287 | if (*cp != '#')
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| 288 | return(-1);
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| 289 | for (ret = 0, cp++ ; *cp && ISDIGIT(*cp) ; cp++)
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| 290 | ret = ret * 10 + *cp - '0';
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| 291 | return(ret);
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| 292 | }
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| 293 | while (*cp && *cp != ':')
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| 294 | cp++;
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| 295 | }
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| 296 | return(-1);
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| 297 | }
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| 298 |
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| 299 | /*
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| 300 | * tgetflag - get the boolean flag corresponding to id. Returns -1
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| 301 | * if invalid, 0 if the flag is not in termcap entry, or 1 if it is
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| 302 | * present.
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| 303 | */
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| 304 | int
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| 305 | tgetflag(id)
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| 306 | char *id;
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| 307 | {
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| 308 | char *cp;
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| 309 |
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| 310 | if ((cp = capab) == NULL || id == NULL || *cp == 0)
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| 311 | return(-1);
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| 312 | while (*++cp && *cp != ':')
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| 313 | ;
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| 314 | while (*cp) {
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| 315 | cp++;
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| 316 | while (ISSPACE(*cp))
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| 317 | cp++;
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| 318 | if (strncmp(cp, id, CAPABLEN) == 0)
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| 319 | return(1);
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| 320 | while (*cp && *cp != ':')
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| 321 | cp++;
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| 322 | }
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| 323 | return(0);
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| 324 | }
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| 325 |
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| 326 | /*
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| 327 | * tgetstr - get the string capability corresponding to id and place
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| 328 | * it in area (advancing area at same time). Expand escape sequences
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| 329 | * etc. Returns the string, or NULL if it can't do it.
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| 330 | */
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| 331 | char *
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| 332 | tgetstr(id, area)
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| 333 | char *id;
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| 334 | char **area;
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| 335 | {
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| 336 | char *cp;
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| 337 | char *ret;
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| 338 | int i;
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| 339 |
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| 340 | if ((cp = capab) == NULL || id == NULL || *cp == 0)
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| 341 | return(NULL);
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| 342 | while (*++cp != ':')
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| 343 | ;
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| 344 | while (*cp) {
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| 345 | cp++;
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| 346 | while (ISSPACE(*cp))
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| 347 | cp++;
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| 348 | if (strncmp(cp, id, CAPABLEN) == 0) {
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| 349 | while (*cp && *cp != ':' && *cp != '=')
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| 350 | cp++;
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| 351 | if (*cp != '=')
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| 352 | return(NULL);
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| 353 | for (ret = *area, cp++; *cp && *cp != ':' ; (*area)++, cp++)
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| 354 | switch(*cp) {
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| 355 | case '^' :
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| 356 | **area = *++cp - 'A' + 1;
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| 357 | break;
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| 358 | case '\\' :
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| 359 | switch(*++cp) {
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| 360 | case 'E' :
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| 361 | **area = '\033';
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| 362 | break;
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| 363 | case 'n' :
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| 364 | **area = '\n';
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| 365 | break;
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| 366 | case 'r' :
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| 367 | **area = '\r';
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| 368 | break;
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| 369 | case 't' :
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| 370 | **area = '\t';
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| 371 | break;
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| 372 | case 'b' :
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| 373 | **area = '\b';
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| 374 | break;
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| 375 | case 'f' :
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| 376 | **area = '\f';
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| 377 | break;
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| 378 | case '0' :
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| 379 | case '1' :
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| 380 | case '2' :
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| 381 | case '3' :
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| 382 | for (i=0 ; *cp && ISDIGIT(*cp) ; cp++)
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| 383 | i = i * 8 + *cp - '0';
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| 384 | **area = i;
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| 385 | cp--;
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| 386 | break;
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| 387 | case '^' :
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| 388 | case '\\' :
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| 389 | **area = *cp;
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| 390 | break;
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| 391 | }
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| 392 | break;
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| 393 | default :
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| 394 | **area = *cp;
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| 395 | }
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| 396 | *(*area)++ = '\0';
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| 397 | return(ret);
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| 398 | }
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| 399 | while (*cp && *cp != ':')
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| 400 | cp++;
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| 401 | }
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| 402 | return(NULL);
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| 403 | }
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| 404 |
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| 405 | /*
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| 406 | * tgoto - given the cursor motion string cm, make up the string
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| 407 | * for the cursor to go to (destcol, destline), and return the string.
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| 408 | * Returns "OOPS" if something's gone wrong, or the string otherwise.
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| 409 | */
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| 410 | char *
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| 411 | tgoto(cm, destcol, destline)
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| 412 | char *cm;
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| 413 | int destcol;
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| 414 | int destline;
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| 415 | {
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| 416 | register char *rp;
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| 417 | static char ret[32];
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| 418 | char added[16];
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| 419 | int *dp = &destline;
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| 420 | int numval;
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| 421 | int swapped = 0;
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| 422 |
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| 423 | added[0] = 0;
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| 424 | for (rp = ret ; *cm ; cm++) {
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| 425 | if (*cm == '%') {
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| 426 | switch(*++cm) {
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| 427 | case '>' :
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| 428 | if (dp == NULL)
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| 429 | return("OOPS");
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| 430 | cm++;
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| 431 | if (*dp > *cm++) {
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| 432 | *dp += *cm;
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| 433 | }
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| 434 | break;
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| 435 | case '+' :
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| 436 | case '.' :
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| 437 | if (dp == NULL)
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| 438 | return("OOPS");
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| 439 | if (*cm == '+') *dp = *dp + *++cm;
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| 440 | for (;;) {
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| 441 | switch(*dp) {
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| 442 | case 0:
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| 443 | case 04:
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| 444 | case '\t':
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| 445 | case '\n':
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| 446 | /* filter these out */
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| 447 | if (dp == &destcol || swapped || UP) {
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| 448 | strcat(added, dp == &destcol || swapped ?
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| 449 | (BC ? BC : "\b") :
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| 450 | UP);
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| 451 | (*dp)++;
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| 452 | continue;
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| 453 | }
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| 454 | }
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| 455 | break;
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| 456 | }
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| 457 | *rp++ = *dp;
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| 458 | dp = (dp == &destline) ? &destcol : NULL;
|
|---|
| 459 | break;
|
|---|
| 460 |
|
|---|
| 461 | case 'r' : {
|
|---|
| 462 | int tmp = destline;
|
|---|
| 463 |
|
|---|
| 464 | destline = destcol;
|
|---|
| 465 | destcol = tmp;
|
|---|
| 466 | swapped = 1 - swapped;
|
|---|
| 467 | break;
|
|---|
| 468 | }
|
|---|
| 469 | case 'n' :
|
|---|
| 470 | destcol ^= 0140;
|
|---|
| 471 | destline ^= 0140;
|
|---|
| 472 | break;
|
|---|
| 473 |
|
|---|
| 474 | case '%' :
|
|---|
| 475 | *rp++ = '%';
|
|---|
| 476 | break;
|
|---|
| 477 |
|
|---|
| 478 | case 'i' :
|
|---|
| 479 | destcol++;
|
|---|
| 480 | destline++;
|
|---|
| 481 | break;
|
|---|
| 482 |
|
|---|
| 483 | case 'B' :
|
|---|
| 484 | if (dp == NULL)
|
|---|
| 485 | return("OOPS");
|
|---|
| 486 | *dp = 16 * (*dp / 10) + *dp % 10;
|
|---|
| 487 | break;
|
|---|
| 488 |
|
|---|
| 489 | case 'D' :
|
|---|
| 490 | if (dp == NULL)
|
|---|
| 491 | return("OOPS");
|
|---|
| 492 | *dp = *dp - 2 * (*dp % 16);
|
|---|
| 493 | break;
|
|---|
| 494 |
|
|---|
| 495 | case 'd' :
|
|---|
| 496 | case '2' :
|
|---|
| 497 | case '3' :
|
|---|
| 498 | if (dp == NULL)
|
|---|
| 499 | return("OOPS");
|
|---|
| 500 | numval = *dp;
|
|---|
| 501 | dp = (dp == &destline) ? &destcol : NULL;
|
|---|
| 502 | if (numval >= 100) {
|
|---|
| 503 | *rp++ = '0' + numval / 100;
|
|---|
| 504 | }
|
|---|
| 505 | else if (*cm == '3') {
|
|---|
| 506 | *rp++ = ' ';
|
|---|
| 507 | }
|
|---|
| 508 | if (numval >= 10) {
|
|---|
| 509 | *rp++ = '0' + ((numval%100)/10);
|
|---|
| 510 | }
|
|---|
| 511 | else if (*cm == '3' || *cm == '2') {
|
|---|
| 512 | *rp++ = ' ';
|
|---|
| 513 | }
|
|---|
| 514 | *rp++ = '0' + (numval%10);
|
|---|
| 515 | break;
|
|---|
| 516 | default :
|
|---|
| 517 | return("OOPS");
|
|---|
| 518 | }
|
|---|
| 519 | }
|
|---|
| 520 | else *rp++ = *cm;
|
|---|
| 521 | }
|
|---|
| 522 | *rp = '\0';
|
|---|
| 523 | strcpy(rp, added);
|
|---|
| 524 | return(ret);
|
|---|
| 525 | }
|
|---|
| 526 |
|
|---|
| 527 | static int tens_of_ms_p_char[] = { /* index as returned by gtty */
|
|---|
| 528 | /* assume 10 bits per char */
|
|---|
| 529 | 0, 2000, 1333, 909, 743, 666, 500, 333, 166, 83, 55, 41, 20, 10, 5, 2
|
|---|
| 530 | };
|
|---|
| 531 | /*
|
|---|
| 532 | * tputs - put the string cp out onto the terminal, using the function
|
|---|
| 533 | * outc. Also handle padding.
|
|---|
| 534 | */
|
|---|
| 535 | int
|
|---|
| 536 | tputs(cp, affcnt, outc)
|
|---|
| 537 | register char *cp;
|
|---|
| 538 | int affcnt;
|
|---|
| 539 | int (*outc)();
|
|---|
| 540 | {
|
|---|
| 541 | int delay = 0;
|
|---|
| 542 | if (cp == NULL)
|
|---|
| 543 | return(1);
|
|---|
| 544 | while (ISDIGIT(*cp)) {
|
|---|
| 545 | delay = delay * 10 + (*cp++ - '0');
|
|---|
| 546 | }
|
|---|
| 547 | delay *= 10;
|
|---|
| 548 | if (*cp == '.') {
|
|---|
| 549 | cp++;
|
|---|
| 550 | if (ISDIGIT(*cp)) {
|
|---|
| 551 | delay += *cp++ - '0';
|
|---|
| 552 | }
|
|---|
| 553 | while (ISDIGIT(*cp)) cp++;
|
|---|
| 554 | }
|
|---|
| 555 | if (*cp == '*') {
|
|---|
| 556 | delay *= affcnt;
|
|---|
| 557 | cp++;
|
|---|
| 558 | }
|
|---|
| 559 | while (*cp)
|
|---|
| 560 | (*outc)(*cp++);
|
|---|
| 561 | if (delay != 0 &&
|
|---|
| 562 | ospeed > 0 &&
|
|---|
| 563 | ospeed < (sizeof tens_of_ms_p_char / sizeof tens_of_ms_p_char[0])) {
|
|---|
| 564 | delay = (delay + tens_of_ms_p_char[ospeed] - 1) /
|
|---|
| 565 | tens_of_ms_p_char[ospeed];
|
|---|
| 566 | while (delay--) (*outc)(PC);
|
|---|
| 567 | }
|
|---|
| 568 | return(1);
|
|---|
| 569 | }
|
|---|
| 570 |
|
|---|
| 571 | /*
|
|---|
| 572 | * That's all, folks...
|
|---|
| 573 | */
|
|---|
