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

   1 /*
   2  * PROJECT:     ReactOS CRT library
   3  * LICENSE:     See COPYING in the top level directory
   4  * FILE:        lib/sdk/crt/stdlib/makepath_s.c
   5  * PURPOSE:     Creates a path
   6  * PROGRAMMERS: Wine team
   7  *              Copyright 1996,1998 Marcus Meissner
   8  *              Copyright 1996 Jukka Iivonen
   9  *              Copyright 1997,2000 Uwe Bonnes
  10  *              Copyright 2000 Jon Griffiths
  11  *
  12  */
  13
  14 #include <precomp.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17
  18 /*********************************************************************
  19  *              _makepath_s (MSVCRT.@)
  20  *
  21  * Safe version of _makepath.
  22  */
  23 int CDECL _makepath_s(char *path, size_t size, const char *drive,
  24                       const char *directory, const char *filename,
  25                       const char *extension)
  26 {
  27     char *p = path;
  28
  29     if (!path || !size)
  30     {
  31         *_errno() = EINVAL;
  32         return EINVAL;
  33     }
  34
  35     if (drive && drive[0])
  36     {
  37         if (size <= 2)
  38             goto range;
  39
  40         *p++ = drive[0];
  41         *p++ = ':';
  42         size -= 2;
  43     }
  44
  45     if (directory && directory[0])
  46     {
  47         unsigned int len = strlen(directory);
  48         unsigned int needs_separator = directory[len - 1] != '/' && directory[len - 1] != '\\';
  49         unsigned int copylen = min(size - 1, len);
  50
  51         if (size < 2)
  52             goto range;
  53
  54         memmove(p, directory, copylen);
  55
  56         if (size <= len)
  57             goto range;
  58
  59         p += copylen;
  60         size -= copylen;
  61
  62         if (needs_separator)
  63         {
  64             if (size < 2)
  65                 goto range;
  66
  67             *p++ = '\\';
  68             size -= 1;
  69         }
  70     }
  71
  72     if (filename && filename[0])
  73     {
  74         unsigned int len = strlen(filename);
  75         unsigned int copylen = min(size - 1, len);
  76
  77         if (size < 2)
  78             goto range;
  79
  80         memmove(p, filename, copylen);
  81
  82         if (size <= len)
  83             goto range;
  84
  85         p += len;
  86         size -= len;
  87     }
  88
  89     if (extension && extension[0])
  90     {
  91         unsigned int len = strlen(extension);
  92         unsigned int needs_period = extension[0] != '.';
  93         unsigned int copylen;
  94
  95         if (size < 2)
  96             goto range;
  97
  98         if (needs_period)
  99         {
 100             *p++ = '.';
 101             size -= 1;
 102         }
 103
 104         copylen = min(size - 1, len);
 105         memcpy(p, extension, copylen);
 106
 107         if (size <= len)
 108             goto range;
 109
 110         p += copylen;
 111     }
 112
 113     *p = '\0';
 114     return 0;
 115
 116 range:
 117     path[0] = '\0';
 118     *_errno() = ERANGE;
 119     return ERANGE;
 120 }