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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/fmt/strerror_r.c Normal file
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/*-*- 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/safemacros.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/fmt/fmt.h"
#include "libc/macros.h"
#include "libc/nt/enum/formatmessageflags.h"
#include "libc/nt/process.h"
#include "libc/nt/runtime.h"
#include "libc/str/str.h"
static const char *geterrname(int code) {
extern const char kErrnoNames[];
const long *e;
const char *s;
size_t i;
for (i = 0, e = &E2BIG; e <= &EXFULL; ++e, ++i) {
if (code == *e && (s = indexdoublenulstring(&kErrnoNames[0], i))) {
return s;
}
}
return NULL;
}
/**
* Converts errno value to string.
* @return 0 on success, or error code
*/
int strerror_r(int err, char *buf, size_t size) {
const char *s;
s = (err == -1 || IsTiny()) ? "?" : firstnonnull(geterrname(err), "?");
if (!SupportsWindows()) {
snprintf(buf, size, "E%s[%d]", s, err);
} else {
char16_t buf16[100];
int winstate, sysvstate;
winstate = GetLastError();
sysvstate = errno;
if (FormatMessage(
kNtFormatMessageFromSystem | kNtFormatMessageIgnoreInserts, NULL,
err, 0, buf16, ARRAYLEN(buf16) - 1, 0) > 0) {
chomp(buf16);
} else {
buf16[0] = u'\0';
}
snprintf(buf, size, "E%s/err=%d/errno:%d/GetLastError:%d%s%hs", s, err,
sysvstate, winstate, buf16[0] ? " " : "", buf16);
}
return 0;
}