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/* $OpenBSD: strerror_r.c,v 1.6 2005/08/08 08:05:37 espie Exp $ */
/* Public Domain <marc@snafu.org> */
// G++ automatically defines _GNU_SOURCE, which then means that <string.h>
// gives us the GNU variant.
#undef _GNU_SOURCE
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include "private/ErrnoRestorer.h"
#include "private/libc_logging.h"
struct Pair {
int code;
const char* msg;
};
static const char* __code_string_lookup(const Pair* strings, int code) {
for (size_t i = 0; strings[i].msg != NULL; ++i) {
if (strings[i].code == code) {
return strings[i].msg;
}
}
return NULL;
}
static const Pair _sys_error_strings[] = {
#define __BIONIC_ERRDEF(x,y,z) { x, z },
#include <sys/_errdefs.h>
{ 0, NULL }
};
extern "C" __LIBC_HIDDEN__ const char* __strerror_lookup(int error_number) {
return __code_string_lookup(_sys_error_strings, error_number);
}
static const Pair _sys_signal_strings[] = {
#define __BIONIC_SIGDEF(signal_number, signal_description) { signal_number, signal_description },
#include <sys/_sigdefs.h>
{ 0, NULL }
};
extern "C" __LIBC_HIDDEN__ const char* __strsignal_lookup(int signal_number) {
return __code_string_lookup(_sys_signal_strings, signal_number);
}
int strerror_r(int error_number, char* buf, size_t buf_len) {
ErrnoRestorer errno_restorer;
size_t length;
const char* error_name = __strerror_lookup(error_number);
if (error_name != NULL) {
length = strlcpy(buf, error_name, buf_len);
} else {
length = __libc_format_buffer(buf, buf_len, "Unknown error %d", error_number);
}
if (length >= buf_len) {
errno_restorer.override(ERANGE);
return -1;
}
return 0;
}
extern "C" char* __gnu_strerror_r(int error_number, char* buf, size_t buf_len) {
ErrnoRestorer errno_restorer; // The glibc strerror_r doesn't set errno if it truncates...
strerror_r(error_number, buf, buf_len);
return buf; // ...and just returns whatever fit.
}
extern "C" __LIBC_HIDDEN__ const char* __strsignal(int signal_number, char* buf, size_t buf_len) {
const char* signal_name = __strsignal_lookup(signal_number);
if (signal_name != NULL) {
return signal_name;
}
const char* prefix = "Unknown";
if (signal_number >= SIGRTMIN && signal_number <= SIGRTMAX) {
prefix = "Real-time";
signal_number -= SIGRTMIN;
}
size_t length = snprintf(buf, buf_len, "%s signal %d", prefix, signal_number);
if (length >= buf_len) {
return NULL;
}
return buf;
}
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