122 lines
4.4 KiB
C
122 lines
4.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/bits.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/calls/struct/timeval.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/fmt/conv.h"
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#include "libc/fmt/fmt.h"
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#include "libc/log/internal.h"
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#include "libc/log/log.h"
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#include "libc/math.h"
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#include "libc/nexgen32e/nexgen32e.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/time/struct/tm.h"
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#include "libc/time/time.h"
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#define kNontrivialSize (8 * 1000 * 1000)
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STATIC_YOINK("ntoa");
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STATIC_YOINK("stoa");
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STATIC_YOINK("ftoa");
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static int loglevel2char(unsigned level) {
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switch (level) {
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case kLogInfo:
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return 'I';
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case kLogDebug:
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return 'D';
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case kLogWarn:
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return 'W';
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case kLogFatal:
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return 'F';
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case kLogVerbose:
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return 'V';
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default:
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return '?';
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}
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}
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/**
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* Takes corrective action if logging is on the fritz.
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*/
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void vflogf_onfail(FILE *f) {
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errno_t err;
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struct stat st;
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if (IsTiny()) return;
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err = ferror(f);
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if ((err == ENOSPC || err == EDQUOT || err == EFBIG) &&
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(fstat(fileno(f), &st) == -1 || st.st_size > kNontrivialSize)) {
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ftruncate(fileno(f), 0);
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fseek(f, SEEK_SET, 0);
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f->beg = f->end = 0;
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clearerr(f);
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(fprintf)(f, "performed emergency log truncation: %s\n", strerror(err));
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}
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}
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/**
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* Writes formatted message w/ timestamp to log.
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*/
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void(vflogf)(unsigned level, const char *file, int line, FILE *f,
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const char *fmt, va_list va) {
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static struct timespec ts;
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struct tm tm;
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long double t2;
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const char *prog;
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int64_t secs, nsec, dots;
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char timebuf[32], *timebufp;
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if (!f) f = g_logfile;
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if (fileno(f) == -1) return;
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t2 = nowl();
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secs = t2;
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nsec = rem1000000000int64(t2 * 1e9L);
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if (secs > ts.tv_sec) {
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localtime_r(&secs, &tm);
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strftime(timebuf, sizeof(timebuf), "%Y-%m-%dT%H:%M:%S.", &tm);
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timebufp = timebuf;
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dots = nsec;
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} else {
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timebufp = "--------------------";
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dots = nsec - ts.tv_nsec;
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}
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ts.tv_sec = secs;
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ts.tv_nsec = nsec;
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prog = basename(program_invocation_name);
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if ((fprintf)(f, "%c%s%06ld:%s:%d:%.*s:%d] ", loglevel2char(level), timebufp,
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rem1000000int64(div1000int64(dots)), file, line,
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strchrnul(prog, '.') - prog, prog, getpid()) <= 0) {
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vflogf_onfail(f);
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}
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(vfprintf)(f, fmt, va);
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va_end(va);
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fputs("\n", f);
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if (level == kLogFatal) {
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__start_fatal(file, line);
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(dprintf)(STDERR_FILENO, "fatal error see logfile\n");
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__die();
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unreachable;
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}
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}
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