416d7ddaff
We already had the POSIX strerror_r, but some third-party code defines _GNU_SOURCE and expects to get the GNU strerror_r instead. This exposed a bug in the libc internal logging functions where unlike their standard brethren they wouldn't return the number of bytes they'd have liked to have written. Bug: 16243479 Change-Id: I1745752ccbdc569646d34f5071f6df2be066d5f4
92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
/* $OpenBSD: strerror_r.c,v 1.6 2005/08/08 08:05:37 espie Exp $ */
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/* Public Domain <marc@snafu.org> */
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// G++ automatically defines _GNU_SOURCE, which then means that <string.h>
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// gives us the GNU variant.
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#undef _GNU_SOURCE
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdio.h>
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#include "private/ErrnoRestorer.h"
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#include "private/libc_logging.h"
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struct Pair {
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int code;
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const char* msg;
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};
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static const char* __code_string_lookup(const Pair* strings, int code) {
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for (size_t i = 0; strings[i].msg != NULL; ++i) {
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if (strings[i].code == code) {
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return strings[i].msg;
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}
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}
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return NULL;
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}
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static const Pair _sys_error_strings[] = {
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#define __BIONIC_ERRDEF(x,y,z) { x, z },
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#include <sys/_errdefs.h>
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{ 0, NULL }
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};
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extern "C" __LIBC_HIDDEN__ const char* __strerror_lookup(int error_number) {
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return __code_string_lookup(_sys_error_strings, error_number);
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}
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static const Pair _sys_signal_strings[] = {
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#define __BIONIC_SIGDEF(signal_number, signal_description) { signal_number, signal_description },
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#include <sys/_sigdefs.h>
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{ 0, NULL }
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};
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extern "C" __LIBC_HIDDEN__ const char* __strsignal_lookup(int signal_number) {
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return __code_string_lookup(_sys_signal_strings, signal_number);
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}
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int strerror_r(int error_number, char* buf, size_t buf_len) {
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ErrnoRestorer errno_restorer;
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size_t length;
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const char* error_name = __strerror_lookup(error_number);
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if (error_name != NULL) {
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length = strlcpy(buf, error_name, buf_len);
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} else {
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length = __libc_format_buffer(buf, buf_len, "Unknown error %d", error_number);
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}
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if (length >= buf_len) {
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errno_restorer.override(ERANGE);
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return -1;
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}
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return 0;
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}
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extern "C" char* __gnu_strerror_r(int error_number, char* buf, size_t buf_len) {
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ErrnoRestorer errno_restorer; // The glibc strerror_r doesn't set errno if it truncates...
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strerror_r(error_number, buf, buf_len);
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return buf; // ...and just returns whatever fit.
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}
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extern "C" __LIBC_HIDDEN__ const char* __strsignal(int signal_number, char* buf, size_t buf_len) {
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const char* signal_name = __strsignal_lookup(signal_number);
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if (signal_name != NULL) {
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return signal_name;
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}
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const char* prefix = "Unknown";
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if (signal_number >= SIGRTMIN && signal_number <= SIGRTMAX) {
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prefix = "Real-time";
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signal_number -= SIGRTMIN;
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}
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size_t length = snprintf(buf, buf_len, "%s signal %d", prefix, signal_number);
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if (length >= buf_len) {
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return NULL;
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}
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return buf;
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}
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