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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206//// makepath.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Defines the makepath family of functions, which compose a path string.//#include <corecrt_internal_securecrt.h>#include <mbstring.h>#include <stdlib.h>
static char const* previous_character(char const* const first, char const* const current) throw(){ return reinterpret_cast<char const*>(_mbsdec( reinterpret_cast<unsigned char const*>(first), reinterpret_cast<unsigned char const*>(current)));}
static wchar_t const* previous_character(wchar_t const*, wchar_t const* const current) throw(){ return current - 1;}
template <typename Character>static errno_t __cdecl cleanup_after_error( _Out_writes_z_(count) Character* const buffer, size_t const count) throw(){ // This is referenced only in the Debug CRT build UNREFERENCED_PARAMETER(count);
_RESET_STRING(buffer, count); _RETURN_BUFFER_TOO_SMALL(buffer, count); return EINVAL; // This is unreachable}
// These functions compose a path string from its component parts. They// concatenate the drive, directory, file_name, and extension into the provided// result_buffer. For the functions that do not have a buffer count parameter,// the buffer is assumed to be large enough to hold however many characters are// required.//// The drive may or may not contain a ':'. The directory may or may not contain// a leading or trailing '/' or '\'. The extension may or may not contain a// leading '.'.template <typename Character>static errno_t __cdecl common_makepath_s( _Out_writes_z_(result_count) Character* const result_buffer, _In_ size_t const result_count, _In_opt_z_ Character const* const drive, _In_opt_z_ Character const* const directory, _In_opt_z_ Character const* const file_name, _In_opt_z_ Character const* const extension ) throw(){ _VALIDATE_STRING(result_buffer, result_count);
Character* result_it = result_buffer;
// For the non-secure makepath functions, result_count is _CRT_UNBOUNDED_BUFFER_SIZE. // In this case, we do not want to perform arithmetic with the result_count. Instead, // we set the result_end to nullptr: result_it will never be a null pointer, // and when we need to perform arithmetic with result_end we can check it for // null first. Character* const result_end = result_count != _CRT_UNBOUNDED_BUFFER_SIZE ? result_buffer + result_count : nullptr;
CRT_WARNING_DISABLE_PUSH(26015, "Silence prefast about overflow - covered by result_end for secure callers")
// Copy the drive: if (drive && drive[0] != '\0') { if (result_end != nullptr && result_end - result_it < 2) return cleanup_after_error(result_buffer, result_count);
*result_it++ = *drive; *result_it++ = ':'; }
// Copy the directory: if (directory && directory[0] != '\0') { Character const* source_it = directory; while (*source_it != '\0') { if ((result_end != nullptr) && (result_it >= result_end)) return cleanup_after_error(result_buffer, result_count);
*result_it++ = *source_it++; }
// Write a trailing backslash if there isn't one: source_it = previous_character(directory, source_it); if (*source_it != '/' && *source_it != '\\') { if ((result_end != nullptr) && (result_it >= result_end)) return cleanup_after_error(result_buffer, result_count);
*result_it++ = '\\'; } }
// Copy the file name: if (file_name) { Character const* source_it = file_name; while (*source_it != '\0') { if ((result_end != nullptr) && (result_it >= result_end)) return cleanup_after_error(result_buffer, result_count);
*result_it++ = *source_it++; } }
// Copy the extension: if (extension) { // Add a '.' if one is required: if (extension[0] != '\0' && extension[0] != '.') { if ((result_end != nullptr) && (result_it >= result_end)) return cleanup_after_error(result_buffer, result_count);
*result_it++ = '.'; }
Character const* source_it = extension; while (*source_it != '\0') { if ((result_end != nullptr) && (result_it >= result_end)) return cleanup_after_error(result_buffer, result_count);
*result_it++ = *source_it++; } }
// Copy the null terminator: if ((result_end != nullptr) && (result_it >= result_end)) return cleanup_after_error(result_buffer, result_count);
*result_it++ = '\0';
CRT_WARNING_POP
_FILL_STRING(result_buffer, result_count, result_it - result_buffer); return 0;}
extern "C" void __cdecl _makepath( char* const result_buffer, char const* const drive, char const* const directory, char const* const file_name, char const* const extension ){ _makepath_s(result_buffer, _CRT_UNBOUNDED_BUFFER_SIZE, drive, directory, file_name, extension);}
extern "C" void __cdecl _wmakepath( wchar_t* const result_buffer, wchar_t const* const drive, wchar_t const* const directory, wchar_t const* const file_name, wchar_t const* const extension ){ _wmakepath_s(result_buffer, _CRT_UNBOUNDED_BUFFER_SIZE, drive, directory, file_name, extension);}
extern "C" errno_t __cdecl _makepath_s( char* const result_buffer, size_t const result_count, char const* const drive, char const* const directory, char const* const file_name, char const* const extension ){ return common_makepath_s(result_buffer, result_count, drive, directory, file_name, extension);}
extern "C" errno_t __cdecl _wmakepath_s( wchar_t* const result_buffer, size_t const result_count, wchar_t const* const drive, wchar_t const* const directory, wchar_t const* const file_name, wchar_t const* const extension ){ return common_makepath_s(result_buffer, result_count, drive, directory, file_name, extension);}