38b8831b3
Denis Vlasenko
2008-02-25
Subject
lpd: now with "svn add"...
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printutils/lpd.c+79 -0
| @@ -0,0 +1,79 @@ | |
| + | /* vi: set sw=4 ts=4: */ |
| + | /* |
| + | * micro lpd - a small non-queueing lpd |
| + | * |
| + | * Copyright (C) 2008 by Vladimir Dronnikov <[email protected]> |
| + | * |
| + | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
| + | */ |
| + | #include "libbb.h" |
| + | |
| + | int lpd_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE; |
| + | int lpd_main(int argc, char *argv[]) |
| + | { |
| + | char *s; |
| + | |
| + | // goto spool directory |
| + | // spool directory contains either links to real printer devices or just simple files |
| + | // these links or files are called "queues" |
| + | if (!argv[1]) |
| + | bb_show_usage(); |
| + | |
| + | xchdir(argv[1]); |
| + | |
| + | xdup2(1, 2); |
| + | |
| + | // read command |
| + | s = xmalloc_reads(STDIN_FILENO, NULL); |
| + | |
| + | // N.B. we keep things simple |
| + | // only "receive job" command is meaningful here... |
| + | if (2 == *s) { |
| + | char *queue; |
| + | |
| + | // parse command: "\x2QUEUE_NAME\n" |
| + | queue = s + 1; |
| + | *strchrnul(s, '\n') = '\0'; |
| + | |
| + | while (1) { |
| + | // signal OK |
| + | write(STDOUT_FILENO, "", 1); |
| + | // get subcommand |
| + | s = xmalloc_reads(STDIN_FILENO, NULL); |
| + | if (!s) |
| + | return EXIT_SUCCESS; // EOF (probably) |
| + | // valid s must be of form: SUBCMD | LEN | SP | FNAME |
| + | // N.B. we bail out on any error |
| + | // control or data file follows |
| + | if (2 == s[0] || 3 == s[0]) { |
| + | int fd; |
| + | size_t len; |
| + | // 2: control file (ignoring), 3: data file |
| + | fd = -1; |
| + | if (3 == s[0]) |
| + | fd = xopen(queue, O_RDWR | O_APPEND); |
| + | // get data length |
| + | *strchrnul(s, ' ') = '\0'; |
| + | len = xatou(s + 1); |
| + | // dump exactly len bytes to file, or die |
| + | bb_copyfd_exact_size(STDIN_FILENO, fd, len); |
| + | close(fd); // NB: can do close(-1). Who cares? |
| + | free(s); |
| + | // got no ACK? -> bail out |
| + | if (safe_read(STDIN_FILENO, s, 1) <= 0 || s[0]) { |
| + | // don't talk to peer - it obviously |
| + | // don't follow the protocol |
| + | return EXIT_FAILURE; |
| + | } |
| + | } else { |
| + | // any other subcommand aborts receiving job |
| + | // N.B. abort subcommand itself doesn't contain |
| + | // fname so it failed earlier... |
| + | break; |
| + | } |
| + | } |
| + | } |
| + | |
| + | printf("Command %02x not supported\n", (unsigned char)*s); |
| + | return EXIT_FAILURE; |
| + | } |