mirror of
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79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
#include "string.h"
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#include "errno.h"
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#include "stdio.h"
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extern "C" {
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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++))
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++len;
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return len;
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}
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int strcmp(const char* s1, const char* s2)
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{
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for (; *s1 == *s2; ++s1, ++s2) {
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if (*s1 == 0)
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return 0;
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}
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return *(const unsigned char*)s1 < *(const unsigned char*)s2 ? -1 : 1;
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}
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void memcpy(void* dest, const void* src, size_t n)
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{
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auto* bdest = (unsigned char*)dest;
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auto* bsrc = (const unsigned char*)src;
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for (; n; --n)
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*(bdest++) = *(bsrc++);
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}
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const char* strerror(int errnum)
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{
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switch (errnum) {
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case 0: return "No error";
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case EPERM: return "Operation not permitted";
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case ENOENT: return "No such file or directory";
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case ESRCH: return "No such process";
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case EINTR: return "Interrupted syscall";
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case EIO: return "I/O error";
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case ENXIO: return "No such device/address";
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case E2BIG: return "Argument list too long";
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case ENOEXEC: return "Exec format error";
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case EBADF: return "Bad fd number";
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case ECHILD: return "No child processes";
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case EAGAIN: return "Try again";
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case ENOMEM: return "Out of memory";
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case EACCES: return "Access denied";
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case EFAULT: return "Bad address";
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case ENOTBLK: return "Not a block device";
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case EBUSY: return "Resource busy";
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case EEXIST: return "File already exists";
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case EXDEV: return "Cross-device link";
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case ENODEV: return "No such device";
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case ENOTDIR: return "Not a directory";
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case EISDIR: return "Is a directory";
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case EINVAL: return "Invalid argument";
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case ENFILE: return "File table overflow";
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case EMFILE: return "Too many open files";
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case ENOTTY: return "Not a TTY";
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case ETXTBSY: return "Text file busy";
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case EFBIG: return "File too big";
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case ENOSPC: return "No space left";
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case ESPIPE: return "Illegal seek";
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case EROFS: return "File system is read-only";
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case EMLINK: return "Too many links";
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case EPIPE: return "Broken pipe";
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case EDOM: return "Math argument out of domain";
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case ERANGE: return "Math result not representable";
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case ENAMETOOLONG: return "Name too long";
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case EOVERFLOW: return "Value too large for data type";
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}
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printf("strerror() missing string for errnum=%d\n", errnum);
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return "Unknown error";
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}
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}
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