banan-os/libc/string.cpp

335 lines
10 KiB
C++

#include <errno.h>
#include <stdio.h>
#include <string.h>
int errno = 0;
int memcmp(const void* s1, const void* s2, size_t n)
{
const unsigned char* a = static_cast<const unsigned char*>(s1);
const unsigned char* b = static_cast<const unsigned char*>(s2);
for (size_t i = 0; i < n; i++)
if (a[i] != b[i])
return a[i] - b[i];
return 0;
}
void* memcpy(void* __restrict__ dstp, const void* __restrict__ srcp, size_t n)
{
unsigned char* dst = static_cast<unsigned char*>(dstp);
const unsigned char* src = static_cast<const unsigned char*>(srcp);
for (size_t i = 0; i < n; i++)
dst[i] = src[i];
return dstp;
}
void* memmove(void* destp, const void* srcp, size_t n)
{
unsigned char* dest = static_cast<unsigned char*>(destp);
const unsigned char* src = static_cast<const unsigned char*>(srcp);
if (dest < src)
{
for (size_t i = 0; i < n; i++)
dest[i] = src[i];
}
else
{
for (size_t i = 1; i <= n; i++)
dest[n - i] = src[n - i];
}
return destp;
}
void* memset(void* s, int c, size_t n)
{
unsigned char* p = static_cast<unsigned char*>(s);
for (size_t i = 0; i < n; i++)
p[i] = c;
return s;
}
int strcmp(const char* s1, const char* s2)
{
const unsigned char* u1 = (unsigned char*)s1;
const unsigned char* u2 = (unsigned char*)s2;
for (; *u1 && *u2; u1++, u2++)
if (*u1 != *u2)
break;
return *u1 - *u2;
}
char* strcpy(char* __restrict__ dest, const char* __restrict__ src)
{
size_t i;
for (i = 0; src[i]; i++)
dest[i] = src[i];
dest[i] = '\0';
return dest;
}
char* strcat(char* __restrict__ dest, const char* __restrict__ src)
{
strcpy(dest + strlen(src), src);
return dest;
}
char* strerror(int error)
{
static char buffer[1024];
buffer[0] = 0;
strcpy(buffer, strerrordesc_np(error));
return buffer;
}
const char* strerrorname_np(int error)
{
switch (error)
{
case 0: return "NOERROR";
case E2BIG: return "E2BIG";
case EACCES: return "EACCES";
case EADDRINUSE: return "EADDRINUSE";
case EADDRNOTAVAIL: return "EADDRNOTAVAIL";
case EAFNOSUPPORT: return "EAFNOSUPPORT";
case EAGAIN: return "EAGAIN";
case EALREADY: return "EALREADY";
case EBADF: return "EBADF";
case EBADMSG: return "EBADMSG";
case EBUSY: return "EBUSY";
case ECANCELED: return "ECANCELED";
case ECHILD: return "ECHILD";
case ECONNABORTED: return "ECONNABORTED";
case ECONNREFUSED: return "ECONNREFUSED";
case ECONNRESET: return "ECONNRESET";
case EDEADLK: return "EDEADLK";
case EDESTADDRREQ: return "EDESTADDRREQ";
case EDOM: return "EDOM";
case EDQUOT: return "EDQUOT";
case EEXIST: return "EEXIST";
case EFAULT: return "EFAULT";
case EFBIG: return "EFBIG";
case EHOSTUNREACH: return "EHOSTUNREACH";
case EIDRM: return "EIDRM";
case EILSEQ: return "EILSEQ";
case EINPROGRESS: return "EINPROGRESS";
case EINTR: return "EINTR";
case EINVAL: return "EINVAL";
case EIO: return "EIO";
case EISCONN: return "EISCONN";
case EISDIR: return "EISDIR";
case ELOOP: return "ELOOP";
case EMFILE: return "EMFILE";
case EMLINK: return "EMLINK";
case EMSGSIZE: return "EMSGSIZE";
case EMULTIHOP: return "EMULTIHOP";
case ENAMETOOLONG: return "ENAMETOOLONG";
case ENETDOWN: return "ENETDOWN";
case ENETRESET: return "ENETRESET";
case ENETUNREACH: return "ENETUNREACH";
case ENFILE: return "ENFILE";
case ENOBUFS: return "ENOBUFS";
case ENODATA: return "ENODATA";
case ENODEV: return "ENODEV";
case ENOENT: return "ENOENT";
case ENOEXEC: return "ENOEXEC";
case ENOLCK: return "ENOLCK";
case ENOLINK: return "ENOLINK";
case ENOMEM: return "ENOMEM";
case ENOMSG: return "ENOMSG";
case ENOPROTOOPT: return "ENOPROTOOPT";
case ENOSPC: return "ENOSPC";
case ENOSR: return "ENOSR";
case ENOSTR: return "ENOSTR";
case ENOSYS: return "ENOSYS";
case ENOTCONN: return "ENOTCONN";
case ENOTDIR: return "ENOTDIR";
case ENOTEMPTY: return "ENOTEMPTY";
case ENOTRECOVERABLE: return "ENOTRECOVERABLE";
case ENOTSOCK: return "ENOTSOCK";
case ENOTSUP: return "ENOTSUP";
case ENOTTY: return "ENOTTY";
case ENXIO: return "ENXIO";
case EOPNOTSUPP: return "EOPNOTSUPP";
case EOVERFLOW: return "EOVERFLOW";
case EOWNERDEAD: return "EOWNERDEAD";
case EPERM: return "EPERM";
case EPIPE: return "EPIPE";
case EPROTO: return "EPROTO";
case EPROTONOSUPPORT: return "EPROTONOSUPPORT";
case EPROTOTYPE: return "EPROTOTYPE";
case ERANGE: return "ERANGE";
case EROFS: return "EROFS";
case ESPIPE: return "ESPIPE";
case ESRCH: return "ESRCH";
case ESTALE: return "ESTALE";
case ETIME: return "ETIME";
case ETIMEDOUT: return "ETIMEDOUT";
case ETXTBSY: return "ETXTBSY";
case EWOULDBLOCK: return "EWOULDBLOCK";
case EXDEV: return "EXDEV";
case EEXISTS: return "EEXISTS";
case ENOTBLK: return "ENOTBLK";
case EUNKNOWN: return "EUNKNOWN";
}
errno = EINVAL;
return "EUNKNOWN";
}
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";
}
errno = EINVAL;
return "Unknown error";
}
size_t strlen(const char* str)
{
size_t len = 0;
while (str[len])
len++;
return len;
}
int strncmp(const char* s1, const char* s2, size_t n)
{
const unsigned char* u1 = (unsigned char*)s1;
const unsigned char* u2 = (unsigned char*)s2;
for (; --n && *u1 && *u2; u1++, u2++)
if (*u1 != *u2)
break;
return *u1 - *u2;
}
char* strchr(const char* str, int c)
{
while (*str)
{
if (*str == c)
return (char*)str;
str++;
}
return (*str == c) ? (char*)str : nullptr;
}
char* strchrnul(const char* str, int c)
{
while (*str)
{
if (*str == c)
return (char*)str;
str++;
}
return (char*)str;
}
char* strncpy(char* __restrict__ dest, const char* __restrict__ src, size_t n)
{
size_t i;
for (i = 0; src[i] && i < n; i++)
dest[i] = src[i];
for (; i < n; i++)
dest[i] = '\0';
return dest;
}
char* strstr(const char* haystack, const char* needle)
{
for (size_t i = 0; haystack[i]; i++)
if (memcmp(haystack + i, needle, strlen(needle)) == 0)
return (char*)haystack + i;
return NULL;
}