335 lines
10 KiB
C++
335 lines
10 KiB
C++
#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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int errno = 0;
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int memcmp(const void* s1, const void* s2, size_t n)
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{
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const unsigned char* a = static_cast<const unsigned char*>(s1);
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const unsigned char* b = static_cast<const unsigned char*>(s2);
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for (size_t i = 0; i < n; i++)
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if (a[i] != b[i])
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return a[i] - b[i];
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return 0;
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}
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void* memcpy(void* __restrict__ dstp, const void* __restrict__ srcp, size_t n)
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{
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unsigned char* dst = static_cast<unsigned char*>(dstp);
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const unsigned char* src = static_cast<const unsigned char*>(srcp);
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for (size_t i = 0; i < n; i++)
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dst[i] = src[i];
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return dstp;
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}
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void* memmove(void* destp, const void* srcp, size_t n)
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{
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unsigned char* dest = static_cast<unsigned char*>(destp);
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const unsigned char* src = static_cast<const unsigned char*>(srcp);
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if (dest < src)
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{
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for (size_t i = 0; i < n; i++)
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dest[i] = src[i];
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}
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else
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{
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for (size_t i = 1; i <= n; i++)
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dest[n - i] = src[n - i];
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}
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return destp;
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}
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void* memset(void* s, int c, size_t n)
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{
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unsigned char* p = static_cast<unsigned char*>(s);
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for (size_t i = 0; i < n; i++)
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p[i] = c;
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return s;
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}
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int strcmp(const char* s1, const char* s2)
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{
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const unsigned char* u1 = (unsigned char*)s1;
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const unsigned char* u2 = (unsigned char*)s2;
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for (; *u1 && *u2; u1++, u2++)
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if (*u1 != *u2)
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break;
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return *u1 - *u2;
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}
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char* strcpy(char* __restrict__ dest, const char* __restrict__ src)
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{
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size_t i;
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for (i = 0; src[i]; i++)
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dest[i] = src[i];
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dest[i] = '\0';
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return dest;
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}
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char* strcat(char* __restrict__ dest, const char* __restrict__ src)
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{
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strcpy(dest + strlen(src), src);
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return dest;
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}
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char* strerror(int error)
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{
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static char buffer[1024];
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buffer[0] = 0;
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strcpy(buffer, strerrordesc_np(error));
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return buffer;
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}
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const char* strerrorname_np(int error)
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{
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switch (error)
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{
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case 0: return "NOERROR";
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case E2BIG: return "E2BIG";
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case EACCES: return "EACCES";
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case EADDRINUSE: return "EADDRINUSE";
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case EADDRNOTAVAIL: return "EADDRNOTAVAIL";
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case EAFNOSUPPORT: return "EAFNOSUPPORT";
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case EAGAIN: return "EAGAIN";
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case EALREADY: return "EALREADY";
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case EBADF: return "EBADF";
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case EBADMSG: return "EBADMSG";
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case EBUSY: return "EBUSY";
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case ECANCELED: return "ECANCELED";
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case ECHILD: return "ECHILD";
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case ECONNABORTED: return "ECONNABORTED";
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case ECONNREFUSED: return "ECONNREFUSED";
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case ECONNRESET: return "ECONNRESET";
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case EDEADLK: return "EDEADLK";
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case EDESTADDRREQ: return "EDESTADDRREQ";
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case EDOM: return "EDOM";
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case EDQUOT: return "EDQUOT";
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case EEXIST: return "EEXIST";
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case EFAULT: return "EFAULT";
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case EFBIG: return "EFBIG";
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case EHOSTUNREACH: return "EHOSTUNREACH";
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case EIDRM: return "EIDRM";
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case EILSEQ: return "EILSEQ";
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case EINPROGRESS: return "EINPROGRESS";
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case EINTR: return "EINTR";
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case EINVAL: return "EINVAL";
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case EIO: return "EIO";
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case EISCONN: return "EISCONN";
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case EISDIR: return "EISDIR";
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case ELOOP: return "ELOOP";
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case EMFILE: return "EMFILE";
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case EMLINK: return "EMLINK";
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case EMSGSIZE: return "EMSGSIZE";
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case EMULTIHOP: return "EMULTIHOP";
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case ENAMETOOLONG: return "ENAMETOOLONG";
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case ENETDOWN: return "ENETDOWN";
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case ENETRESET: return "ENETRESET";
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case ENETUNREACH: return "ENETUNREACH";
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case ENFILE: return "ENFILE";
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case ENOBUFS: return "ENOBUFS";
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case ENODATA: return "ENODATA";
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case ENODEV: return "ENODEV";
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case ENOENT: return "ENOENT";
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case ENOEXEC: return "ENOEXEC";
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case ENOLCK: return "ENOLCK";
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case ENOLINK: return "ENOLINK";
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case ENOMEM: return "ENOMEM";
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case ENOMSG: return "ENOMSG";
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case ENOPROTOOPT: return "ENOPROTOOPT";
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case ENOSPC: return "ENOSPC";
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case ENOSR: return "ENOSR";
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case ENOSTR: return "ENOSTR";
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case ENOSYS: return "ENOSYS";
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case ENOTCONN: return "ENOTCONN";
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case ENOTDIR: return "ENOTDIR";
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case ENOTEMPTY: return "ENOTEMPTY";
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case ENOTRECOVERABLE: return "ENOTRECOVERABLE";
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case ENOTSOCK: return "ENOTSOCK";
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case ENOTSUP: return "ENOTSUP";
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case ENOTTY: return "ENOTTY";
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case ENXIO: return "ENXIO";
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case EOPNOTSUPP: return "EOPNOTSUPP";
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case EOVERFLOW: return "EOVERFLOW";
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case EOWNERDEAD: return "EOWNERDEAD";
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case EPERM: return "EPERM";
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case EPIPE: return "EPIPE";
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case EPROTO: return "EPROTO";
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case EPROTONOSUPPORT: return "EPROTONOSUPPORT";
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case EPROTOTYPE: return "EPROTOTYPE";
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case ERANGE: return "ERANGE";
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case EROFS: return "EROFS";
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case ESPIPE: return "ESPIPE";
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case ESRCH: return "ESRCH";
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case ESTALE: return "ESTALE";
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case ETIME: return "ETIME";
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case ETIMEDOUT: return "ETIMEDOUT";
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case ETXTBSY: return "ETXTBSY";
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case EWOULDBLOCK: return "EWOULDBLOCK";
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case EXDEV: return "EXDEV";
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case EEXISTS: return "EEXISTS";
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case ENOTBLK: return "ENOTBLK";
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case EUNKNOWN: return "EUNKNOWN";
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}
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errno = EINVAL;
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return "EUNKNOWN";
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}
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const char* strerrordesc_np(int error)
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{
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switch (error)
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{
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case 0: return "Success";
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case E2BIG: return "Argument list too long.";
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case EACCES: return "Permission denied.";
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case EADDRINUSE: return "Address in use.";
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case EADDRNOTAVAIL: return "Address not available.";
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case EAFNOSUPPORT: return "Address family not supported.";
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case EAGAIN: return "Resource unavailable, try again.";
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case EALREADY: return "Connection already in progress.";
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case EBADF: return "Bad file descriptor.";
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case EBADMSG: return "Bad message.";
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case EBUSY: return "Device or resource busy.";
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case ECANCELED: return "Operation canceled.";
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case ECHILD: return "No child processes.";
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case ECONNABORTED: return "Connection aborted.";
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case ECONNREFUSED: return "Connection refused.";
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case ECONNRESET: return "Connection reset.";
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case EDEADLK: return "Resource deadlock would occur.";
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case EDESTADDRREQ: return "Destination address required.";
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case EDOM: return "Mathematics argument out of domain of function.";
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case EDQUOT: return "Reserved.";
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case EEXIST: return "File exists.";
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case EFAULT: return "Bad address.";
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case EFBIG: return "File too large.";
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case EHOSTUNREACH: return "Host is unreachable.";
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case EIDRM: return "Identifier removed.";
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case EILSEQ: return "Illegal byte sequence.";
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case EINPROGRESS: return "Operation in progress.";
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case EINTR: return "Interrupted function.";
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case EINVAL: return "Invalid argument.";
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case EIO: return "I/O error.";
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case EISCONN: return "Socket is connected.";
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case EISDIR: return "Is a directory.";
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case ELOOP: return "Too many levels of symbolic links.";
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case EMFILE: return "File descriptor value too large.";
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case EMLINK: return "Too many links.";
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case EMSGSIZE: return "Message too large.";
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case EMULTIHOP: return "Reserved.";
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case ENAMETOOLONG: return "Filename too long.";
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case ENETDOWN: return "Network is down.";
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case ENETRESET: return "Connection aborted by network.";
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case ENETUNREACH: return "Network unreachable.";
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case ENFILE: return "Too many files open in system.";
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case ENOBUFS: return "No buffer space available.";
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case ENODATA: return "No message is available on the STREAM head read queue.";
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case ENODEV: return "No such device.";
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case ENOENT: return "No such file or directory.";
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case ENOEXEC: return "Executable file format error.";
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case ENOLCK: return "No locks available.";
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case ENOLINK: return "Reserved.";
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case ENOMEM: return "Not enough space.";
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case ENOMSG: return "No message of the desired type.";
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case ENOPROTOOPT: return "Protocol not available.";
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case ENOSPC: return "No space left on device.";
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case ENOSR: return "No STREAM resources.";
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case ENOSTR: return "Not a STREAM.";
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case ENOSYS: return "Functionality not supported.";
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case ENOTCONN: return "The socket is not connected.";
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case ENOTDIR: return "Not a directory or a symbolic link to a directory.";
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case ENOTEMPTY: return "Directory not empty.";
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case ENOTRECOVERABLE: return "State not recoverable.";
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case ENOTSOCK: return "Not a socket.";
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case ENOTSUP: return "Not supported.";
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case ENOTTY: return "Inappropriate I/O control operation.";
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case ENXIO: return "No such device or address.";
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case EOPNOTSUPP: return "Operation not supported on socket .";
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case EOVERFLOW: return "Value too large to be stored in data type.";
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case EOWNERDEAD: return "Previous owner died.";
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case EPERM: return "Operation not permitted.";
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case EPIPE: return "Broken pipe.";
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case EPROTO: return "Protocol error.";
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case EPROTONOSUPPORT: return "Protocol not supported.";
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case EPROTOTYPE: return "Protocol wrong type for socket.";
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case ERANGE: return "Result too large.";
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case EROFS: return "Read-only file system.";
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case ESPIPE: return "Invalid seek.";
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case ESRCH: return "No such process.";
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case ESTALE: return "Reserved.";
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case ETIME: return "Stream ioctl() timeout.";
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case ETIMEDOUT: return "Connection timed out.";
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case ETXTBSY: return "Text file busy.";
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case EWOULDBLOCK: return "Operation would block.";
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case EXDEV: return "Cross-device link.";
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case EEXISTS: return "File exists";
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case ENOTBLK: return "Block device required";
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case EUNKNOWN: return "Unknown error";
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}
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errno = EINVAL;
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return "Unknown error";
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}
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size_t strlen(const char* str)
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{
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size_t len = 0;
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while (str[len])
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len++;
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return len;
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}
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int strncmp(const char* s1, const char* s2, size_t n)
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{
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const unsigned char* u1 = (unsigned char*)s1;
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const unsigned char* u2 = (unsigned char*)s2;
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for (; --n && *u1 && *u2; u1++, u2++)
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if (*u1 != *u2)
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break;
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return *u1 - *u2;
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}
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char* strchr(const char* str, int c)
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{
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while (*str)
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{
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if (*str == c)
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return (char*)str;
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str++;
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}
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return (*str == c) ? (char*)str : nullptr;
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}
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char* strchrnul(const char* str, int c)
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{
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while (*str)
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{
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if (*str == c)
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return (char*)str;
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str++;
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}
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return (char*)str;
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}
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char* strncpy(char* __restrict__ dest, const char* __restrict__ src, size_t n)
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{
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size_t i;
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for (i = 0; src[i] && i < n; i++)
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dest[i] = src[i];
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for (; i < n; i++)
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dest[i] = '\0';
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return dest;
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}
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char* strstr(const char* haystack, const char* needle)
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{
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for (size_t i = 0; haystack[i]; i++)
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if (memcmp(haystack + i, needle, strlen(needle)) == 0)
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return (char*)haystack + i;
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return NULL;
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}
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