#include "features.h" // for __weak

#include <errno.h>  // for ERANGE, E2BIG, EACCES, EADDRINUSE, EADDRNOTAVAIL
#include <libc.h>   // for __unused
#include <string.h> // for memcpy, size_t, strerror, strlen, locale_t

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);
}