reactos/sdk/lib/crt/stdlib/makepath_s.c

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/*
* PROJECT: ReactOS CRT library
* LICENSE: See COPYING in the top level directory
* FILE: lib/sdk/crt/stdlib/makepath_s.c
* PURPOSE: Creates a path
* PROGRAMMERS: Wine team
* Copyright 1996,1998 Marcus Meissner
* Copyright 1996 Jukka Iivonen
* Copyright 1997,2000 Uwe Bonnes
* Copyright 2000 Jon Griffiths
*
*/
#include <precomp.h>
#include <stdlib.h>
#include <string.h>
/*********************************************************************
* _makepath_s (MSVCRT.@)
*
* Safe version of _makepath.
*/
int CDECL _makepath_s(char *path, size_t size, const char *drive,
const char *directory, const char *filename,
const char *extension)
{
char *p = path;
if (!path || !size)
{
*_errno() = EINVAL;
return EINVAL;
}
if (drive && drive[0])
{
if (size <= 2)
goto range;
*p++ = drive[0];
*p++ = ':';
size -= 2;
}
if (directory && directory[0])
{
size_t len = strlen(directory);
unsigned int needs_separator = directory[len - 1] != '/' && directory[len - 1] != '\\';
size_t copylen = min(size - 1, len);
if (size < 2)
goto range;
memmove(p, directory, copylen);
if (size <= len)
goto range;
p += copylen;
size -= copylen;
if (needs_separator)
{
if (size < 2)
goto range;
*p++ = '\\';
size -= 1;
}
}
if (filename && filename[0])
{
size_t len = strlen(filename);
size_t copylen = min(size - 1, len);
if (size < 2)
goto range;
memmove(p, filename, copylen);
if (size <= len)
goto range;
p += len;
size -= len;
}
if (extension && extension[0])
{
size_t len = strlen(extension);
unsigned int needs_period = extension[0] != '.';
size_t copylen;
if (size < 2)
goto range;
if (needs_period)
{
*p++ = '.';
size -= 1;
}
copylen = min(size - 1, len);
memcpy(p, extension, copylen);
if (size <= len)
goto range;
p += copylen;
}
*p = '\0';
return 0;
range:
path[0] = '\0';
*_errno() = ERANGE;
return ERANGE;
}