Annotation of src/lib/libc/gen/getttyent.c, Revision 1.1
1.1 ! cgd 1: /*
! 2: * Copyright (c) 1989 The Regents of the University of California.
! 3: * 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. All advertising materials mentioning features or use of this software
! 14: * must display the following acknowledgement:
! 15: * This product includes software developed by the University of
! 16: * California, Berkeley and its contributors.
! 17: * 4. Neither the name of the University nor the names of its contributors
! 18: * may be used to endorse or promote products derived from this software
! 19: * without specific prior written permission.
! 20: *
! 21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 31: * SUCH DAMAGE.
! 32: */
! 33:
! 34: #if defined(LIBC_SCCS) && !defined(lint)
! 35: static char sccsid[] = "@(#)getttyent.c 5.10 (Berkeley) 3/23/91";
! 36: #endif /* LIBC_SCCS and not lint */
! 37:
! 38: #include <ttyent.h>
! 39: #include <stdio.h>
! 40: #include <ctype.h>
! 41: #include <string.h>
! 42:
! 43: static char zapchar;
! 44: static FILE *tf;
! 45:
! 46: struct ttyent *
! 47: getttynam(tty)
! 48: const char *tty;
! 49: {
! 50: register struct ttyent *t;
! 51:
! 52: setttyent();
! 53: while (t = getttyent())
! 54: if (!strcmp(tty, t->ty_name))
! 55: break;
! 56: endttyent();
! 57: return (t);
! 58: }
! 59:
! 60: struct ttyent *
! 61: getttyent()
! 62: {
! 63: static struct ttyent tty;
! 64: register int c;
! 65: register char *p;
! 66: #define MAXLINELENGTH 100
! 67: static char line[MAXLINELENGTH];
! 68: static char *skip(), *value();
! 69:
! 70: if (!tf && !setttyent())
! 71: return (NULL);
! 72: for (;;) {
! 73: if (!fgets(p = line, sizeof(line), tf))
! 74: return (NULL);
! 75: /* skip lines that are too big */
! 76: if (!index(p, '\n')) {
! 77: while ((c = getc(tf)) != '\n' && c != EOF)
! 78: ;
! 79: continue;
! 80: }
! 81: while (isspace(*p))
! 82: ++p;
! 83: if (*p && *p != '#')
! 84: break;
! 85: }
! 86:
! 87: zapchar = 0;
! 88: tty.ty_name = p;
! 89: p = skip(p);
! 90: if (!*(tty.ty_getty = p))
! 91: tty.ty_getty = tty.ty_type = NULL;
! 92: else {
! 93: p = skip(p);
! 94: if (!*(tty.ty_type = p))
! 95: tty.ty_type = NULL;
! 96: else
! 97: p = skip(p);
! 98: }
! 99: tty.ty_status = 0;
! 100: tty.ty_window = NULL;
! 101:
! 102: #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
! 103: #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
! 104: for (; *p; p = skip(p)) {
! 105: if (scmp(_TTYS_OFF))
! 106: tty.ty_status &= ~TTY_ON;
! 107: else if (scmp(_TTYS_ON))
! 108: tty.ty_status |= TTY_ON;
! 109: else if (scmp(_TTYS_SECURE))
! 110: tty.ty_status |= TTY_SECURE;
! 111: else if (vcmp(_TTYS_WINDOW))
! 112: tty.ty_window = value(p);
! 113: else
! 114: break;
! 115: }
! 116:
! 117: if (zapchar == '#' || *p == '#')
! 118: while ((c = *++p) == ' ' || c == '\t')
! 119: ;
! 120: tty.ty_comment = p;
! 121: if (*p == 0)
! 122: tty.ty_comment = 0;
! 123: if (p = index(p, '\n'))
! 124: *p = '\0';
! 125: return (&tty);
! 126: }
! 127:
! 128: #define QUOTED 1
! 129:
! 130: /*
! 131: * Skip over the current field, removing quotes, and return a pointer to
! 132: * the next field.
! 133: */
! 134: static char *
! 135: skip(p)
! 136: register char *p;
! 137: {
! 138: register char *t;
! 139: register int c, q;
! 140:
! 141: for (q = 0, t = p; (c = *p) != '\0'; p++) {
! 142: if (c == '"') {
! 143: q ^= QUOTED; /* obscure, but nice */
! 144: continue;
! 145: }
! 146: if (q == QUOTED && *p == '\\' && *(p+1) == '"')
! 147: p++;
! 148: *t++ = *p;
! 149: if (q == QUOTED)
! 150: continue;
! 151: if (c == '#') {
! 152: zapchar = c;
! 153: *p = 0;
! 154: break;
! 155: }
! 156: if (c == '\t' || c == ' ' || c == '\n') {
! 157: zapchar = c;
! 158: *p++ = 0;
! 159: while ((c = *p) == '\t' || c == ' ' || c == '\n')
! 160: p++;
! 161: break;
! 162: }
! 163: }
! 164: *--t = '\0';
! 165: return (p);
! 166: }
! 167:
! 168: static char *
! 169: value(p)
! 170: register char *p;
! 171: {
! 172:
! 173: return ((p = index(p, '=')) ? ++p : NULL);
! 174: }
! 175:
! 176: int
! 177: setttyent()
! 178: {
! 179:
! 180: if (tf) {
! 181: (void)rewind(tf);
! 182: return (1);
! 183: } else if (tf = fopen(_PATH_TTYS, "r"))
! 184: return (1);
! 185: return (0);
! 186: }
! 187:
! 188: int
! 189: endttyent()
! 190: {
! 191: int rval;
! 192:
! 193: if (tf) {
! 194: rval = !(fclose(tf) == EOF);
! 195: tf = NULL;
! 196: return (rval);
! 197: }
! 198: return (1);
! 199: }
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