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Stored size: 1.68 KB
Contents
#ifndef MLIB_ERROR_PRIVATE_H
#define MLIB_ERROR_PRIVATE_H
#include "./user-check.h"
#include "./str.h"
#ifdef _WIN32
#include "./windows-lean.h"
#else
#include <errno.h>
#endif
/**
* @brief Obtain a string containing an error message corresponding to an error
* code from the host platform.
*
* @param errn An error code for the system. (e.g. GetLastError() on Windows)
* @return mstr A new string containing the resulting error. Must be freed with
* @ref mstr_free().
*/
static inline mstr
merror_system_error_string (int errn)
{
#ifdef _WIN32
wchar_t *wbuffer = NULL;
DWORD slen = FormatMessageW (FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
(DWORD) errn,
0,
(LPWSTR) &wbuffer,
0,
NULL);
if (slen == 0) {
return mstr_copy_cstr (
"[Error while getting error string from FormatMessageW()]");
}
mstr_narrow_result narrow = mstr_win32_narrow (wbuffer);
LocalFree (wbuffer);
assert (narrow.error == 0);
// Messages from FormatMessage contain an additional CR+LF
if (mstr_ends_with (narrow.string.view, mstrv_lit ("\r\n"))) {
mstr_inplace_remove_suffix (&narrow.string, 2);
}
return narrow.string;
#else
errno = 0;
char *const str = strerror (errn);
if (errno) {
return mstr_copy_cstr (
"[Error while getting error string from strerror()]");
}
return mstr_copy_cstr (str);
#endif
}
#endif // MLIB_ERROR_PRIVATE_H
Version data entries
3 entries across 3 versions & 1 rubygems