65 lines
2.9 KiB
C
65 lines
2.9 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/errno.h"
|
|
#include "libc/mem/mem.h"
|
|
#include "libc/runtime/carsort.h"
|
|
#include "tool/build/lib/xlaterrno.h"
|
|
|
|
struct LinuxErrno {
|
|
int32_t local;
|
|
int32_t linux;
|
|
};
|
|
|
|
extern const char kLinuxErrnosLength[];
|
|
extern const struct LinuxErrno kLinuxErrnos[];
|
|
static struct LinuxErrno *errnos;
|
|
|
|
/**
|
|
* Turns local errno into Linux errno.
|
|
*/
|
|
int XlatErrno(int local) {
|
|
static bool once;
|
|
long i, n, m, l, r;
|
|
n = (uintptr_t)kLinuxErrnosLength;
|
|
if (!once) {
|
|
errnos = malloc(sizeof(struct LinuxErrno) * n);
|
|
for (i = 0; i < n; ++i) {
|
|
errnos[i].local =
|
|
*(int *)((intptr_t)kLinuxErrnos + kLinuxErrnos[i].local);
|
|
errnos[i].linux = kLinuxErrnos[i].linux;
|
|
}
|
|
carsort100(n, (void *)errnos);
|
|
once = true;
|
|
}
|
|
l = 0;
|
|
r = n - 1;
|
|
while (l <= r) {
|
|
m = (l + r) / 2;
|
|
if (errnos[m].local < local) {
|
|
l = m + 1;
|
|
} else if (errnos[m].local > local) {
|
|
r = m - 1;
|
|
} else {
|
|
return errnos[m].linux;
|
|
}
|
|
}
|
|
return ENOSYS;
|
|
}
|