cosmopolitan/libc/log/vflogf.c

123 lines
4.5 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program 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 │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/bits.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/stat.h"
#include "libc/calls/struct/timeval.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/fmt/conv.h"
#include "libc/fmt/fmt.h"
#include "libc/log/internal.h"
#include "libc/log/log.h"
#include "libc/math.h"
#include "libc/nexgen32e/nexgen32e.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/fileno.h"
#include "libc/time/struct/tm.h"
#include "libc/time/time.h"
#define kNontrivialSize (8 * 1000 * 1000)
STATIC_YOINK("ntoa");
STATIC_YOINK("stoa");
STATIC_YOINK("ftoa");
static int loglevel2char(unsigned level) {
switch (level) {
case kLogInfo:
return 'I';
case kLogDebug:
return 'D';
case kLogWarn:
return 'W';
case kLogFatal:
return 'F';
case kLogVerbose:
return 'V';
default:
return '?';
}
}
/**
* Takes corrective action if logging is on the fritz.
*/
void vflogf_onfail(FILE *f) {
errno_t err;
struct stat st;
if (IsTiny()) return;
err = ferror(f);
if ((err == ENOSPC || err == EDQUOT || err == EFBIG) &&
(fstat(fileno(f), &st) == -1 || st.st_size > kNontrivialSize)) {
ftruncate(fileno(f), 0);
fseek(f, SEEK_SET, 0);
f->beg = f->end = 0;
clearerr(f);
(fprintf)(f, "performed emergency log truncation: %s\r\n", strerror(err));
}
}
/**
* Writes formatted message w/ timestamp to log.
*/
void(vflogf)(unsigned level, const char *file, int line, FILE *f,
const char *fmt, va_list va) {
static struct timespec ts;
struct tm tm;
long double t2;
const char *prog;
int64_t secs, nsec, dots;
char timebuf[32], *timebufp;
if (!f) f = g_logfile;
if (fileno(f) == -1) return;
t2 = nowl();
secs = t2;
nsec = rem1000000000int64(t2 * 1e9L);
if (secs > ts.tv_sec) {
localtime_r(&secs, &tm);
strftime(timebuf, sizeof(timebuf), "%Y-%m-%dT%H:%M:%S.", &tm);
timebufp = timebuf;
dots = nsec;
} else {
timebufp = "--------------------";
dots = nsec - ts.tv_nsec;
}
ts.tv_sec = secs;
ts.tv_nsec = nsec;
prog = basename(program_invocation_name);
if ((fprintf)(f, "%c%s%06ld:%s:%d:%.*s:%d] ", loglevel2char(level), timebufp,
rem1000000int64(div1000int64(dots)), file, line,
strchrnul(prog, '.') - prog, prog, getpid()) <= 0) {
vflogf_onfail(f);
}
(vfprintf)(f, fmt, va);
va_end(va);
fputs("\r\n", f);
if (level == kLogFatal) {
__start_fatal(file, line);
(dprintf)(STDERR_FILENO, "fatal error see logfile\r\n");
__die();
unreachable;
}
}