src/core/show-status.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2014 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include "alloc-util.h"
  21 #include "fd-util.h"
  22 #include "io-util.h"
  23 #include "parse-util.h"
  24 #include "show-status.h"
  25 #include "string-util.h"
  26 #include "terminal-util.h"
  27 #include "util.h"
  28
  29 int parse_show_status(const char *v, ShowStatus *ret) {
  30         int r;
  31
  32         assert(v);
  33         assert(ret);
  34
  35         if (streq(v, "auto")) {
  36                 *ret = SHOW_STATUS_AUTO;
  37                 return 0;
  38         }
  39
  40         r = parse_boolean(v);
  41         if (r < 0)
  42                 return r;
  43
  44         *ret = r ? SHOW_STATUS_YES : SHOW_STATUS_NO;
  45         return 0;
  46 }
  47
  48 int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) {
  49         static const char status_indent[] = "         "; /* "[" STATUS "] " */
  50         _cleanup_free_ char *s = NULL;
  51         _cleanup_close_ int fd = -1;
  52         struct iovec iovec[6] = {};
  53         int n = 0;
  54         static bool prev_ephemeral;
  55
  56         assert(format);
  57
  58         /* This is independent of logging, as status messages are
  59          * optional and go exclusively to the console. */
  60
  61         if (vasprintf(&s, format, ap) < 0)
  62                 return log_oom();
  63
  64         fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
  65         if (fd < 0)
  66                 return fd;
  67
  68         if (ellipse) {
  69                 char *e;
  70                 size_t emax, sl;
  71                 int c;
  72
  73                 c = fd_columns(fd);
  74                 if (c <= 0)
  75                         c = 80;
  76
  77                 sl = status ? sizeof(status_indent)-1 : 0;
  78
  79                 emax = c - sl - 1;
  80                 if (emax < 3)
  81                         emax = 3;
  82
  83                 e = ellipsize(s, emax, 50);
  84                 if (e) {
  85                         free(s);
  86                         s = e;
  87                 }
  88         }
  89
  90         if (prev_ephemeral)
  91                 IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE);
  92         prev_ephemeral = ephemeral;
  93
  94         if (status) {
  95                 if (!isempty(status)) {
  96                         IOVEC_SET_STRING(iovec[n++], "[");
  97                         IOVEC_SET_STRING(iovec[n++], status);
  98                         IOVEC_SET_STRING(iovec[n++], "] ");
  99                 } else
 100                         IOVEC_SET_STRING(iovec[n++], status_indent);
 101         }
 102
 103         IOVEC_SET_STRING(iovec[n++], s);
 104         if (!ephemeral)
 105                 IOVEC_SET_STRING(iovec[n++], "\n");
 106
 107         if (writev(fd, iovec, n) < 0)
 108                 return -errno;
 109
 110         return 0;
 111 }
 112
 113 int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) {
 114         va_list ap;
 115         int r;
 116
 117         assert(format);
 118
 119         va_start(ap, format);
 120         r = status_vprintf(status, ellipse, ephemeral, format, ap);
 121         va_end(ap);
 122
 123         return r;
 124 }