1 files changed, 125 insertions, 0 deletions
diff --git a/lib/libc/string/strerror.c b/lib/libc/string/strerror.c
new file mode 100644
index 00000000..1d5903cb
--- /dev/null
+++ b/lib/libc/string/strerror.c
@@ -0,0 +1,125 @@
+#include <libc.h>
+#include <errno.h>
+#include <string.h>
+#include <locale.h>
+
+char *strerror(int errnum)
+{
+	char *table[] = {
+		[0] = "No error information",
+		[EILSEQ] = "Illegal byte sequence",
+		[EDOM] = "Domain error",
+		[ERANGE] = "Result not representable",
+		[ENOTTY] = "Not a tty",
+		[EACCES] = "Permission denied",
+		[EPERM] = "Operation not permitted",
+		[ENOENT] = "No such file or directory",
+		[ESRCH] = "No such process",
+		[EEXIST] = "File exists",
+		[EOVERFLOW] = "Value too large for data type",
+		[ENOSPC] = "No space left on device",
+		[ENOMEM] = "Out of memory",
+		[EBUSY] = "Resource busy",
+		[EINTR] = "Interrupted system call",
+		[EAGAIN] = "Resource temporarily unavailable",
+		[ESPIPE] = "Invalid seek",
+		[EXDEV] = "Cross-device link",
+		[EROFS] = "Read-only file system",
+		[ENOTEMPTY] = "Directory not empty",
+		[ECONNRESET] = "Connection reset by peer",
+		[ETIMEDOUT] = "Operation timed out",
+		[ECONNREFUSED] = "Connection refused",
+		[EHOSTDOWN] = "Host is down",
+		[EHOSTUNREACH] = "Host is unreachable",
+		[EADDRINUSE] = "Address in use",
+		[EPIPE] = "Broken pipe",
+		[EIO] = "I/O error",
+		[ENXIO] = "No such device or address",
+		[ENOTBLK] = "Block device required",
+		[ENODEV] = "No such device",
+		[ENOTDIR] = "Not a directory",
+		[EISDIR] = "Is a directory",
+		[ETXTBSY] = "Text file busy",
+		[ENOEXEC] = "Exec format error",
+		[EINVAL] = "Invalid argument",
+		[E2BIG] = "Argument list too long",
+		[ELOOP] = "Symbolic link loop",
+		[ENAMETOOLONG] = "Filename too long",
+		[ENFILE] = "Too many open files in system",
+		[EMFILE] = "No file descriptors available",
+		[EBADF] = "Bad file descriptor",
+		[ECHILD] = "No child process",
+		[EFAULT] = "Bad address",
+		[EFBIG] = "File too large",
+		[EMLINK] = "Too many links",
+		[ENOLCK] = "No locks available",
+		[EDEADLK] = "Resource deadlock would occur",
+		[ENOTRECOVERABLE] = "State not recoverable",
+		[EOWNERDEAD] = "Previous owner died",
+		[ECANCELED] = "Operation canceled",
+		[ENOSYS] = "Function not implemented",
+		[ENOMSG] = "No message of desired type",
+		[EIDRM] = "Identifier removed",
+		[ENOSTR] = "Device not a stream",
+		[ENODATA] = "No data available",
+		[ETIME] = "Device timeout",
+		[ENOSR] = "Out of streams resources",
+		[ENOLINK] = "Link has been severed",
+		[EPROTO] = "Protocol error",
+		[EBADMSG] = "Bad message",
+		[EBADFD] = "File descriptor in bad state",
+		[ENOTSOCK] = "Not a socket",
+		[EDESTADDRREQ] = "Destination address required",
+		[EMSGSIZE] = "Message too large",
+		[EPROTOTYPE] = "Protocol wrong type for socket",
+		[ENOPROTOOPT] = "Protocol not available",
+		[EPROTONOSUPPORT] = "Not supported",
+		[ESOCKTNOSUPPORT] = "Type not supported",
+		[ENOTSUP] = "Not supported",
+		[EPFNOSUPPORT] = "Protocol family not supported",
+		[EAFNOSUPPORT] = "Address family not supported by protocol",
+		[EADDRNOTAVAIL] = "Address not available",
+		[ENETDOWN] = "Network is down",
+		[ENETUNREACH] = "Network unreachable",
+		[ENETRESET] = "Connection reset by network",
+		[ECONNABORTED] = "Connection aborted",
+		[ENOBUFS] = "No buffer space available",
+		[EISCONN] = "Socket is connected",
+		[ENOTCONN] = "Socket not connected",
+		[ESHUTDOWN] = "Cannot send after socket shutdown",
+		[EALREADY] = "Operation already in progress",
+		[EINPROGRESS] = "Operation in progress",
+		[ESTALE] = "Stale file handle",
+		[EUCLEAN] = "Data consistency error",
+		[ENAVAIL] = "Resource not available",
+		[EREMOTEIO] = "Remote I/O error",
+		[EDQUOT] = "Quota exceeded",
+		[ENOMEDIUM] = "No medium found",
+		[EMEDIUMTYPE] = "Wrong medium type",
+		[EMULTIHOP] = "Multihop attempted",
+		[ENOKEY] = "Required key not available",
+		[EKEYEXPIRED] = "Key has expired",
+		[EKEYREVOKED] = "Key has been revoked",
+		[EKEYREJECTED] = "Key was rejected by service",
+	};
+
+	return table[errnum];
+}
+
+int strerror_r(int errnum, char *buf, size_t buflen)
+{
+	const char *msg = strerror(errnum);
+	size_t msglen = strlen(msg) + 1;
+
+	if (buflen < msglen) {
+		return ERANGE;
+	}
+
+	memcpy(buf, msg, msglen);
+	return 0;
+}
+
+weak char *strerror_l(int errnum, locale_t unused locale)
+{
+	return strerror(errnum);
+}