banan-os/kernel/klibc/string.cpp

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#include <errno.h>
#include <string.h>
int memcmp(const void* s1, const void* s2, size_t n)
{
auto* u1 = static_cast<const unsigned char*>(s1);
auto* u2 = static_cast<const unsigned char*>(s2);
for (size_t i = 0; i < n; i++)
if (u1[i] != u2[i])
return u1[i] - u2[i];
return 0;
}
void* memcpy(void* __restrict s1, const void* __restrict s2, size_t n)
{
auto* dst = static_cast<unsigned char*>(s1);
auto* src = static_cast<const unsigned char*>(s2);
for (size_t i = 0; i < n; i++)
dst[i] = src[i];
return s1;
}
void* memmove(void* s1, const void* s2, size_t n)
{
auto* dst = static_cast<unsigned char*>(s1);
auto* src = static_cast<const unsigned char*>(s2);
if (dst < src)
{
for (size_t i = 0; i < n; i++)
dst[i] = src[i];
}
else
{
for (size_t i = 1; i <= n; i++)
dst[n - i] = src[n - i];
}
return s1;
}
void* memset(void* s, int c, size_t n)
{
auto* u = static_cast<unsigned char*>(s);
for (size_t i = 0; i < n; i++)
u[i] = c;
return s;
}
size_t strlen(const char* str)
{
size_t len = 0;
while (str[len])
len++;
return len;
}
char* strcpy(char* __restrict dst, const char* __restrict src)
{
size_t i = 0;
for (; src[i]; i++)
dst[i] = src[i];
dst[i] = '\0';
return dst;
}
char* strncpy(char* __restrict dst, const char* __restrict src, size_t len)
{
size_t i = 0;
for (; i < len && src[i]; i++)
dst[i] = src[i];
if (i < len)
dst[i] = '\0';
return dst;
}
const char* strerrordesc_np(int error)
{
switch (error)
{
case 0: return "Success";
case E2BIG: return "Argument list too long.";
case EACCES: return "Permission denied.";
case EADDRINUSE: return "Address in use.";
case EADDRNOTAVAIL: return "Address not available.";
case EAFNOSUPPORT: return "Address family not supported.";
case EAGAIN: return "Resource unavailable, try again.";
case EALREADY: return "Connection already in progress.";
case EBADF: return "Bad file descriptor.";
case EBADMSG: return "Bad message.";
case EBUSY: return "Device or resource busy.";
case ECANCELED: return "Operation canceled.";
case ECHILD: return "No child processes.";
case ECONNABORTED: return "Connection aborted.";
case ECONNREFUSED: return "Connection refused.";
case ECONNRESET: return "Connection reset.";
case EDEADLK: return "Resource deadlock would occur.";
case EDESTADDRREQ: return "Destination address required.";
case EDOM: return "Mathematics argument out of domain of function.";
case EDQUOT: return "Reserved.";
case EEXIST: return "File exists.";
case EFAULT: return "Bad address.";
case EFBIG: return "File too large.";
case EHOSTUNREACH: return "Host is unreachable.";
case EIDRM: return "Identifier removed.";
case EILSEQ: return "Illegal byte sequence.";
case EINPROGRESS: return "Operation in progress.";
case EINTR: return "Interrupted function.";
case EINVAL: return "Invalid argument.";
case EIO: return "I/O error.";
case EISCONN: return "Socket is connected.";
case EISDIR: return "Is a directory.";
case ELOOP: return "Too many levels of symbolic links.";
case EMFILE: return "File descriptor value too large.";
case EMLINK: return "Too many links.";
case EMSGSIZE: return "Message too large.";
case EMULTIHOP: return "Reserved.";
case ENAMETOOLONG: return "Filename too long.";
case ENETDOWN: return "Network is down.";
case ENETRESET: return "Connection aborted by network.";
case ENETUNREACH: return "Network unreachable.";
case ENFILE: return "Too many files open in system.";
case ENOBUFS: return "No buffer space available.";
case ENODATA: return "No message is available on the STREAM head read queue.";
case ENODEV: return "No such device.";
case ENOENT: return "No such file or directory.";
case ENOEXEC: return "Executable file format error.";
case ENOLCK: return "No locks available.";
case ENOLINK: return "Reserved.";
case ENOMEM: return "Not enough space.";
case ENOMSG: return "No message of the desired type.";
case ENOPROTOOPT: return "Protocol not available.";
case ENOSPC: return "No space left on device.";
case ENOSR: return "No STREAM resources.";
case ENOSTR: return "Not a STREAM.";
case ENOSYS: return "Functionality not supported.";
case ENOTCONN: return "The socket is not connected.";
case ENOTDIR: return "Not a directory or a symbolic link to a directory.";
case ENOTEMPTY: return "Directory not empty.";
case ENOTRECOVERABLE: return "State not recoverable.";
case ENOTSOCK: return "Not a socket.";
case ENOTSUP: return "Not supported.";
case ENOTTY: return "Inappropriate I/O control operation.";
case ENXIO: return "No such device or address.";
case EOPNOTSUPP: return "Operation not supported on socket .";
case EOVERFLOW: return "Value too large to be stored in data type.";
case EOWNERDEAD: return "Previous owner died.";
case EPERM: return "Operation not permitted.";
case EPIPE: return "Broken pipe.";
case EPROTO: return "Protocol error.";
case EPROTONOSUPPORT: return "Protocol not supported.";
case EPROTOTYPE: return "Protocol wrong type for socket.";
case ERANGE: return "Result too large.";
case EROFS: return "Read-only file system.";
case ESPIPE: return "Invalid seek.";
case ESRCH: return "No such process.";
case ESTALE: return "Reserved.";
case ETIME: return "Stream ioctl() timeout.";
case ETIMEDOUT: return "Connection timed out.";
case ETXTBSY: return "Text file busy.";
case EWOULDBLOCK: return "Operation would block.";
case EXDEV: return "Cross-device link.";
case EEXISTS: return "File exists";
case ENOTBLK: return "Block device required";
case EUNKNOWN: return "Unknown error";
}
return nullptr;
}