diff options
Diffstat (limited to 'lib/libc/gen/getttyent.c')
| -rw-r--r-- | lib/libc/gen/getttyent.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/lib/libc/gen/getttyent.c b/lib/libc/gen/getttyent.c new file mode 100644 index 0000000..9b9e3ea --- /dev/null +++ b/lib/libc/gen/getttyent.c @@ -0,0 +1,257 @@ +/* + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <ttyent.h> +#include <stdio.h> +#include <stdlib.h> +#include <ctype.h> +#include <string.h> + +static char zapchar; +static FILE *tf; +static size_t lbsize; +static char *line; + +#define MALLOCCHUNK 100 + +static char *skip(char *); +static char *value(char *); + +struct ttyent * +getttynam(const char *tty) +{ + struct ttyent *t; + + if (strncmp(tty, "/dev/", 5) == 0) + tty += 5; + setttyent(); + while ( (t = getttyent()) ) + if (!strcmp(tty, t->ty_name)) + break; + endttyent(); + return (t); +} + +struct ttyent * +getttyent(void) +{ + static struct ttyent tty; + char *p; + int c; + size_t i; + + if (!tf && !setttyent()) + return (NULL); + for (;;) { + if (!fgets(p = line, lbsize, tf)) + return (NULL); + /* extend buffer if line was too big, and retry */ + while (!index(p, '\n') && !feof(tf)) { + i = strlen(p); + lbsize += MALLOCCHUNK; + if ((p = realloc(line, lbsize)) == NULL) { + (void)endttyent(); + return (NULL); + } + line = p; + if (!fgets(&line[i], lbsize - i, tf)) + return (NULL); + } + while (isspace((unsigned char)*p)) + ++p; + if (*p && *p != '#') + break; + } + +#define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) +#define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' + + zapchar = 0; + tty.ty_name = p; + tty.ty_status = 0; + tty.ty_window = NULL; + tty.ty_group = _TTYS_NOGROUP; + + p = skip(p); + if (!*(tty.ty_getty = p)) + tty.ty_getty = tty.ty_type = NULL; + else { + p = skip(p); + if (!*(tty.ty_type = p)) + tty.ty_type = NULL; + else { + /* compatibility kludge: handle network/dialup specially */ + if (scmp(_TTYS_DIALUP)) + tty.ty_status |= TTY_DIALUP; + else if (scmp(_TTYS_NETWORK)) + tty.ty_status |= TTY_NETWORK; + p = skip(p); + } + } + + for (; *p; p = skip(p)) { + if (scmp(_TTYS_OFF)) + tty.ty_status &= ~TTY_ON; + else if (scmp(_TTYS_ON)) + tty.ty_status |= TTY_ON; + else if (scmp(_TTYS_SECURE)) + tty.ty_status |= TTY_SECURE; + else if (scmp(_TTYS_INSECURE)) + tty.ty_status &= ~TTY_SECURE; + else if (scmp(_TTYS_DIALUP)) + tty.ty_status |= TTY_DIALUP; + else if (scmp(_TTYS_NETWORK)) + tty.ty_status |= TTY_NETWORK; + else if (vcmp(_TTYS_WINDOW)) + tty.ty_window = value(p); + else if (vcmp(_TTYS_GROUP)) + tty.ty_group = value(p); + else + break; + } + + if (zapchar == '#' || *p == '#') + while ((c = *++p) == ' ' || c == '\t') + ; + tty.ty_comment = p; + if (*p == 0) + tty.ty_comment = 0; + if ( (p = index(p, '\n')) ) + *p = '\0'; + return (&tty); +} + +#define QUOTED 1 + +/* + * Skip over the current field, removing quotes, and return a pointer to + * the next field. + */ +static char * +skip(char *p) +{ + char *t; + int c, q; + + for (q = 0, t = p; (c = *p) != '\0'; p++) { + if (c == '"') { + q ^= QUOTED; /* obscure, but nice */ + continue; + } + if (q == QUOTED && *p == '\\' && *(p+1) == '"') + p++; + *t++ = *p; + if (q == QUOTED) + continue; + if (c == '#') { + zapchar = c; + *p = 0; + break; + } + if (c == '\t' || c == ' ' || c == '\n') { + zapchar = c; + *p++ = 0; + while ((c = *p) == '\t' || c == ' ' || c == '\n') + p++; + break; + } + } + *--t = '\0'; + return (p); +} + +static char * +value(char *p) +{ + + return ((p = index(p, '=')) ? ++p : NULL); +} + +int +setttyent(void) +{ + + if (line == NULL) { + if ((line = malloc(MALLOCCHUNK)) == NULL) + return (0); + lbsize = MALLOCCHUNK; + } + if (tf) { + rewind(tf); + return (1); + } else if ( (tf = fopen(_PATH_TTYS, "r")) ) + return (1); + return (0); +} + +int +endttyent(void) +{ + int rval; + + /* + * NB: Don't free `line' because getttynam() + * may still be referencing it + */ + if (tf) { + rval = (fclose(tf) != EOF); + tf = NULL; + return (rval); + } + return (1); +} + +static int +isttystat(const char *tty, int flag) +{ + struct ttyent *t; + + return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); +} + + +int +isdialuptty(const char *tty) +{ + + return isttystat(tty, TTY_DIALUP); +} + +int +isnettty(const char *tty) +{ + + return isttystat(tty, TTY_NETWORK); +} |
