janwas
6e82e33ccf
- debug_warn_err now takes LibError - lib_error.cpp: revise error code -> string (only support liberror now); add function to set errno from LibError - unifont, CFont: parameter made a simple wchar_t from const wchar_t& - mmap now sets errno - Loader and VfsUtil function now return LibError as well - Profile.cpp, ProfileViewer.cpp: fix int/uint/size_t warnings - Renderer.cpp: fix cannot-generate-assignment-operator warning This was SVN commit r3235.
116 lines
3.1 KiB
C++
116 lines
3.1 KiB
C++
// note: this is called lib_errors.cpp because we have another
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// errors.cpp; the MS linker isn't smart enough to deal with
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// object files of the same name but in different paths.
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#include "precompiled.h"
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#include "lib_errors.h"
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#include "sysdep/sysdep.h"
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#include <string.h>
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#include <stdlib.h> // abs
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static const char* LibError_description(LibError err)
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{
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// not in our range
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const int ierr = abs((int)err);
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if(!(ERR_MIN <= ierr && ierr < ERR_MAX))
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return 0;
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switch(err)
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{
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#define ERR(err, id, str) case id: return str;
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#include "lib_errors.h"
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default: return "Unknown error";
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}
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UNREACHABLE;
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}
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// generate textual description of an error code.
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// stores up to <max_chars> in the given buffer.
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// if error is unknown/invalid, the string will be something like
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// "Unknown error (65536, 0x10000)".
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void error_description_r(LibError err, char* buf, size_t max_chars)
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{
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// lib error
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const char* str = LibError_description(err);
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if(str)
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{
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// <err> was one of our error codes (chosen so as not to conflict
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// with any others), so we're done.
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strcpy_s(buf, max_chars, str);
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return;
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}
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// fallback
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snprintf(buf, max_chars, "Unknown error (%d, 0x%X)", err, err);
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}
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// return the LibError equivalent of errno, or ERR_FAIL if
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// there's no equal.
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// only call after a POSIX function indicates failure.
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LibError LibError_from_errno()
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{
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switch(errno)
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{
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case ENOMEM: return ERR_NO_MEM;
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case EINVAL: return ERR_INVALID_PARAM;
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case ENOSYS: return ERR_NOT_IMPLEMENTED;
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case ENOENT: return ERR_PATH_NOT_FOUND;
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case EACCES: return ERR_FILE_ACCESS;
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case EIO: return ERR_IO;
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case ENAMETOOLONG: return ERR_PATH_LENGTH;
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default: return ERR_FAIL;
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}
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UNREACHABLE;
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}
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// translate the return value of any POSIX function into LibError.
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// ret is typically to -1 to indicate error and 0 on success.
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// you should set errno to 0 before calling the POSIX function to
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// make sure we do not return any stale errors.
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LibError LibError_from_posix(int ret)
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{
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debug_assert(ret == 0 || ret == -1);
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return (ret == 0)? ERR_OK : LibError_from_errno();
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}
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// return the errno.h equivalent of <err>.
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// does not assign to errno (this simplifies code by allowing direct return)
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static int return_errno_from_LibError(LibError err)
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{
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switch(err)
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{
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case ERR_NO_MEM: return ENOMEM;
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case ERR_INVALID_PARAM: return EINVAL;
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case ERR_NOT_IMPLEMENTED: return ENOSYS;
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case ERR_PATH_NOT_FOUND: return ENOENT;
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case ERR_FILE_ACCESS: return EACCES;
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case ERR_IO: return EIO;
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case ERR_PATH_LENGTH: return ENAMETOOLONG;
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// somewhat of a quandary: the set of errnos in wposix.h doesn't
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// have an "unknown error". we pick EPERM because we don't expect
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// that to come up often otherwise.
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default: return EPERM;
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}
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}
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// set errno to the equivalent of <err>. used in wposix - underlying
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// functions return LibError but must be translated to errno at
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// e.g. the mmap interface level. higher-level code that calls mmap will
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// in turn convert back to LibError.
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void LibError_set_errno(LibError err)
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{
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errno = return_errno_from_LibError(err);
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}
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