137 lines
2.4 KiB
C
137 lines
2.4 KiB
C
/*
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* Copyright (c) 1985 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <strings.h>
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#include <ttyent.h>
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static char TTYFILE[] = "/etc/ttys";
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static int zapchar;
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static FILE *tf = NULL;
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#define LINE 256
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static char line[LINE];
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static struct ttyent tty;
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void
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setttyent()
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{
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if (tf == NULL)
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tf = fopen(TTYFILE, "r");
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else
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rewind(tf);
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}
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void
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endttyent()
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{
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if (tf != NULL) {
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(void) fclose(tf);
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tf = NULL;
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}
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}
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#define QUOTED 1
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/*
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* Skip over the current field, removing quotes,
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* and return a pointer to the next field.
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*/
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static char *
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skip(p)
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register char *p;
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{
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register char *t = p;
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register int c;
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register int q = 0;
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for (; (c = *p) != '\0'; p++) {
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if (c == '"') {
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q ^= QUOTED; /* obscure, but nice */
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continue;
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}
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if (q == QUOTED && *p == '\\' && *(p+1) == '"')
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p++;
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*t++ = *p;
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if (q == QUOTED)
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continue;
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if (c == '#') {
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zapchar = c;
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*p = 0;
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break;
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}
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if (c == '\t' || c == ' ' || c == '\n') {
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zapchar = c;
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*p++ = 0;
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while ((c = *p) == '\t' || c == ' ' || c == '\n')
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p++;
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break;
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}
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}
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*--t = '\0';
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return (p);
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}
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static char *
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value(p)
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register char *p;
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{
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if ((p = index(p,'=')) == 0)
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return(NULL);
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p++; /* get past the = sign */
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return(p);
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}
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struct ttyent *
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getttyent()
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{
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register char *p;
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register int c;
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if (tf == NULL) {
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if ((tf = fopen(TTYFILE, "r")) == NULL)
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return (NULL);
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}
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do {
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p = fgets(line, LINE, tf);
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if (p == NULL)
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return (NULL);
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while ((c = *p) == '\t' || c == ' ' || c == '\n')
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p++;
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} while (c == '\0' || c == '#');
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zapchar = 0;
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tty.ty_name = p;
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p = skip(p);
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tty.ty_getty = p;
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p = skip(p);
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tty.ty_type = p;
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p = skip(p);
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tty.ty_status = 0;
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tty.ty_window = NULL;
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for (; *p; p = skip(p)) {
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#define space(x) ((c = p[x]) == ' ' || c == '\t' || c == '\n')
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if (strncmp(p, "on", 2) == 0 && space(2))
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tty.ty_status |= TTY_ON;
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else if (strncmp(p, "off", 3) == 0 && space(3))
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tty.ty_status &= ~TTY_ON;
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else if (strncmp(p, "secure", 6) == 0 && space(6))
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tty.ty_status |= TTY_SECURE;
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else if (strncmp(p, "window=", 7) == 0)
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tty.ty_window = value(p);
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else
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break;
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}
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if (zapchar == '#' || *p == '#')
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while ((c = *++p) == ' ' || c == '\t')
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;
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tty.ty_comment = p;
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if (*p == 0)
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tty.ty_comment = 0;
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p = index(p, '\n');
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if (p)
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*p = '\0';
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return(&tty);
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}
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