diff options
Diffstat (limited to 'libc/misc/ttyent/getttyent.c')
| -rw-r--r-- | libc/misc/ttyent/getttyent.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/libc/misc/ttyent/getttyent.c b/libc/misc/ttyent/getttyent.c new file mode 100644 index 000000000..7784a6ab4 --- /dev/null +++ b/libc/misc/ttyent/getttyent.c @@ -0,0 +1,198 @@ +/* + * 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 0 +static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; +#endif + +#include <ttyent.h> +#include <stdio.h> +#include <stdio_ext.h> +#include <ctype.h> +#include <string.h> + +static char zapchar; +static FILE *tf; + +struct ttyent * +getttynam(const char *tty) +{ + register struct ttyent *t; + + setttyent(); + while ((t = getttyent())) + if (!strcmp(tty, t->ty_name)) + break; + endttyent(); + return (t); +} + +static char *skip __P((char *)); +static char *value __P((char *)); + +struct ttyent * getttyent() +{ + static struct ttyent tty; + register int c; + register char *p; +#define MAXLINELENGTH 100 + static char line[MAXLINELENGTH]; + + if (!tf && !setttyent()) + return (NULL); + flockfile (tf); + for (;;) { + if (!fgets_unlocked(p = line, sizeof(line), tf)) { + funlockfile (tf); + return (NULL); + } + /* skip lines that are too big */ + if (!index(p, '\n')) { + while ((c = getc_unlocked(tf)) != '\n' && c != EOF) + ; + continue; + } + while (isspace(*p)) + ++p; + if (*p && *p != '#') + break; + } + + zapchar = 0; + tty.ty_name = p; + 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 + p = skip(p); + } + tty.ty_status = 0; + tty.ty_window = NULL; + +#define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1]) +#define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' + 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 (vcmp(_TTYS_WINDOW)) + tty.ty_window = value(p); + else + break; + } + /* We can release the lock only here since `zapchar' is global. */ + funlockfile(tf); + + 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(register char *p) +{ + register char *t; + register 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(register char *p) +{ + + return ((p = index(p, '=')) ? ++p : NULL); +} + +int setttyent(void) +{ + + if (tf) { + rewind(tf); + return (1); + } else if ((tf = fopen(_PATH_TTYS, "r"))) { + /* We do the locking ourselves. */ + __fsetlocking (tf, FSETLOCKING_BYCALLER); + return (1); + } + return (0); +} + +int endttyent(void) +{ + int rval; + + if (tf) { + rval = !(fclose(tf) == EOF); + tf = NULL; + return (rval); + } + return (1); +} |