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/*
* xtl_logger_stdio.c
*
* log message consumer that writes to stdio
*
* Copyright (c) 2010 Citrix
* Part of a generic logging interface used by various dom0 userland libraries.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xentoollog.h"
#include <time.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
struct xentoollog_logger_stdiostream {
xentoollog_logger vtable;
FILE *f;
xentoollog_level min_level;
unsigned flags;
int progress_erase_len, progress_last_percent;
int tty;
};
static void progress_erase(xentoollog_logger_stdiostream *lg) {
if (lg->progress_erase_len)
fprintf(lg->f, "\r%*s\r", lg->progress_erase_len, "");
}
static void stdiostream_vmessage(xentoollog_logger *logger_in,
xentoollog_level level,
int errnoval,
const char *context,
const char *format,
va_list al) {
xentoollog_logger_stdiostream *lg = (void*)logger_in;
if (level < lg->min_level)
return;
progress_erase(lg);
if (lg->flags & XTL_STDIOSTREAM_SHOW_DATE) {
struct tm lt_buf;
time_t now = time(0);
struct tm *lt= localtime_r(&now, <_buf);
fprintf(lg->f, "%04d-%02d-%02d %02d:%02d:%02d %s ",
lt->tm_year+1900, lt->tm_mon+1, lt->tm_mday,
lt->tm_hour, lt->tm_min, lt->tm_sec,
tzname[daylight ? !!lt->tm_isdst : 0]);
}
if (lg->flags & XTL_STDIOSTREAM_SHOW_PID)
fprintf(lg->f, "[%lu] ", (unsigned long)getpid());
if (context)
fprintf(lg->f, "%s: ", context);
fprintf(lg->f, "%s: ", xtl_level_to_string(level));
vfprintf(lg->f, format, al);
if (errnoval >= 0)
fprintf(lg->f, ": %s", strerror(errnoval));
putc('\n', lg->f);
fflush(lg->f);
}
static void stdiostream_message(struct xentoollog_logger *logger_in,
xentoollog_level level,
const char *context,
const char *format, ...)
{
va_list al;
va_start(al,format);
stdiostream_vmessage(logger_in, level, -1, context, format, al);
va_end(al);
}
static void stdiostream_progress(struct xentoollog_logger *logger_in,
const char *context,
const char *doing_what, int percent,
unsigned long done, unsigned long total) {
xentoollog_logger_stdiostream *lg = (void*)logger_in;
int newpel, extra_erase;
xentoollog_level this_level;
if (lg->flags & XTL_STDIOSTREAM_HIDE_PROGRESS)
return;
if (percent < lg->progress_last_percent) {
this_level = XTL_PROGRESS;
} else if (percent == lg->progress_last_percent) {
return;
} else if (percent < lg->progress_last_percent + 5) {
this_level = XTL_DETAIL;
} else {
this_level = XTL_PROGRESS;
}
if (this_level < lg->min_level)
return;
lg->progress_last_percent = percent;
if (!lg->tty) {
stdiostream_message(logger_in, this_level, context,
"%s: %lu/%lu %3d%%",
doing_what, done, total, percent);
return;
}
if (lg->progress_erase_len)
putc('\r', lg->f);
newpel = fprintf(lg->f, "%s%s" "%s: %lu/%lu %3d%%%s",
context?context:"", context?": ":"",
doing_what, done, total, percent,
done == total ? "\n" : "");
extra_erase = lg->progress_erase_len - newpel;
if (extra_erase > 0)
fprintf(lg->f, "%*s\r", extra_erase, "");
lg->progress_erase_len = newpel;
}
static void stdiostream_destroy(struct xentoollog_logger *logger_in) {
xentoollog_logger_stdiostream *lg = (void*)logger_in;
progress_erase(lg);
free(lg);
}
void xtl_stdiostream_set_minlevel(xentoollog_logger_stdiostream *lg,
xentoollog_level min_level) {
lg->min_level = min_level;
}
void xtl_stdiostream_adjust_flags(xentoollog_logger_stdiostream *lg,
unsigned set_flags, unsigned clear_flags) {
unsigned new_flags = (lg->flags & ~clear_flags) | set_flags;
if (new_flags & XTL_STDIOSTREAM_HIDE_PROGRESS)
progress_erase(lg);
lg->flags = new_flags;
}
xentoollog_logger_stdiostream *xtl_createlogger_stdiostream
(FILE *f, xentoollog_level min_level, unsigned flags) {
xentoollog_logger_stdiostream newlogger;
newlogger.f = f;
newlogger.min_level = min_level;
newlogger.flags = flags;
newlogger.tty = isatty(fileno(newlogger.f)) > 0;
if (newlogger.flags & XTL_STDIOSTREAM_SHOW_DATE) tzset();
newlogger.progress_erase_len = 0;
return XTL_NEW_LOGGER(stdiostream, newlogger);
}
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