payloads/libpayload/curses/PDCurses/dos/pdcclip.c

   1 /* Public Domain Curses */
   2
   3 #include "pdcdos.h"
   4
   5 RCSID("$Id: pdcclip.c,v 1.33 2008/07/13 16:08:17 wmcbrine Exp $")
   6
   7 #include <stdlib.h>
   8
   9 /*man-start**************************************************************
  10
  11   Name:                                                         clipboard
  12
  13   Synopsis:
  14         int PDC_getclipboard(char **contents, long *length);
  15         int PDC_setclipboard(const char *contents, long length);
  16         int PDC_freeclipboard(char *contents);
  17         int PDC_clearclipboard(void);
  18
  19   Description:
  20         PDC_getclipboard() gets the textual contents of the system's
  21         clipboard. This function returns the contents of the clipboard
  22         in the contents argument. It is the responsibilitiy of the
  23         caller to free the memory returned, via PDC_freeclipboard().
  24         The length of the clipboard contents is returned in the length
  25         argument.
  26
  27         PDC_setclipboard copies the supplied text into the system's
  28         clipboard, emptying the clipboard prior to the copy.
  29
  30         PDC_clearclipboard() clears the internal clipboard.
  31
  32   Return Values:
  33         indicator of success/failure of call.
  34         PDC_CLIP_SUCCESS        the call was successful
  35         PDC_CLIP_MEMORY_ERROR   unable to allocate sufficient memory for
  36                                 the clipboard contents
  37         PDC_CLIP_EMPTY          the clipboard contains no text
  38         PDC_CLIP_ACCESS_ERROR   no clipboard support
  39
  40   Portability                                X/Open    BSD    SYS V
  41         PDC_getclipboard                        -       -       -
  42         PDC_setclipboard                        -       -       -
  43         PDC_freeclipboard                       -       -       -
  44         PDC_clearclipboard                      -       -       -
  45
  46 **man-end****************************************************************/
  47
  48 /* global clipboard contents, should be NULL if none set */
  49
  50 static char *pdc_DOS_clipboard = NULL;
  51
  52 int PDC_getclipboard(char **contents, long *length)
  53 {
  54     int len;
  55
  56     PDC_LOG(("PDC_getclipboard() - called\n"));
  57
  58     if (!pdc_DOS_clipboard)
  59         return PDC_CLIP_EMPTY;
  60
  61     len = strlen(pdc_DOS_clipboard);
  62     if ((*contents = malloc(len + 1)) == NULL)
  63         return PDC_CLIP_MEMORY_ERROR;
  64
  65     strcpy(*contents, pdc_DOS_clipboard);
  66     *length = len;
  67
  68     return PDC_CLIP_SUCCESS;
  69 }
  70
  71 int PDC_setclipboard(const char *contents, long length)
  72 {
  73     PDC_LOG(("PDC_setclipboard() - called\n"));
  74
  75     if (pdc_DOS_clipboard)
  76     {
  77         free(pdc_DOS_clipboard);
  78         pdc_DOS_clipboard = NULL;
  79     }
  80
  81     if (contents)
  82     {
  83         if ((pdc_DOS_clipboard = malloc(length + 1)) == NULL)
  84             return PDC_CLIP_MEMORY_ERROR;
  85
  86         strcpy(pdc_DOS_clipboard, contents);
  87     }
  88
  89     return PDC_CLIP_SUCCESS;
  90 }
  91
  92 int PDC_freeclipboard(char *contents)
  93 {
  94     PDC_LOG(("PDC_freeclipboard() - called\n"));
  95
  96     /* should we also free empty the system clipboard? probably not */
  97
  98     if (contents)
  99     {
 100
 101         /* NOTE: We free the memory, but we can not set caller's pointer
 102            to NULL, so if caller calls again then will try to access
 103            free'd memory.  We 1st overwrite memory with a string so if
 104            caller tries to use free memory they won't get what they
 105            expect & hopefully notice. */
 106
 107         /* memset(contents, 0xFD, strlen(contents)); */
 108
 109         if (strlen(contents) >= strlen("PDCURSES"))
 110             strcpy(contents, "PDCURSES");
 111
 112         free(contents);
 113     }
 114
 115     return PDC_CLIP_SUCCESS;
 116 }
 117
 118 int PDC_clearclipboard(void)
 119 {
 120     PDC_LOG(("PDC_clearclipboard() - called\n"));
 121
 122     if (pdc_DOS_clipboard)
 123     {
 124         free(pdc_DOS_clipboard);
 125         pdc_DOS_clipboard = NULL;
 126     }
 127
 128     return PDC_CLIP_SUCCESS;
 129 }