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      1 /*
      2 
      3 Copyright 1986, 1998  The Open Group
      4 
      5 Permission to use, copy, modify, distribute, and sell this software and its
      6 documentation for any purpose is hereby granted without fee, provided that
      7 the above copyright notice appear in all copies and that both that
      8 copyright notice and this permission notice appear in supporting
      9 documentation.
     10 
     11 The above copyright notice and this permission notice shall be included in
     12 all copies or substantial portions of the Software.
     13 
     14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
     17 OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
     18 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     19 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     20 
     21 Except as contained in this notice, the name of The Open Group shall not be
     22 used in advertising or otherwise to promote the sale, use or other dealings
     23 in this Software without prior written authorization from The Open Group.
     24 
     25 */
     26 
     27 #ifdef HAVE_CONFIG_H
     28 #include <config.h>
     29 #endif
     30 #include "Xlibint.h"
     31 
     32 int
     33 XDrawString(
     34     register Display *dpy,
     35     Drawable d,
     36     GC gc,
     37     int x,
     38     int y,
     39     _Xconst char *string,
     40     int length)
     41 {
     42     int Datalength = 0;
     43     register xPolyText8Req *req;
     44 
     45     if (length <= 0)
     46        return 0;
     47 
     48     LockDisplay(dpy);
     49     FlushGC(dpy, gc);
     50     GetReq (PolyText8, req);
     51     req->drawable = d;
     52     req->gc = gc->gid;
     53     req->x = x;
     54     req->y = y;
     55 
     56 
     57     Datalength += SIZEOF(xTextElt) * ((length + 253) / 254) + length;
     58 
     59 
     60     req->length += (Datalength + 3)>>2;  /* convert to number of 32-bit words */
     61 
     62 
     63     /*
     64      * If the entire request does not fit into the remaining space in the
     65      * buffer, flush the buffer first.   If the request does fit into the
     66      * empty buffer, then we won't have to flush it at the end to keep
     67      * the buffer 32-bit aligned.
     68      */
     69 
     70     if (dpy->bufptr + Datalength > dpy->bufmax)
     71     	_XFlush (dpy);
     72 
     73     {
     74 	int nbytes;
     75 	int PartialNChars = length;
     76         /* register xTextElt *elt; */
     77  	char *CharacterOffset = (char *)string;
     78         unsigned char *tbuf;
     79 
     80 	while(PartialNChars > 254)
     81         {
     82  	    nbytes = 254 + SIZEOF(xTextElt);
     83 	    BufAlloc (unsigned char *, tbuf, nbytes);
     84 /*    elt->delta = 0;
     85  *    elt->len = 254;
     86  */
     87             *(unsigned char *)tbuf = 254;
     88             *(tbuf+1) = 0;
     89 /*       memcpy ((char *) (elt + 1), CharacterOffset, 254);
     90  */
     91             memcpy ((char *)tbuf+2, CharacterOffset, 254);
     92 	    PartialNChars = PartialNChars - 254;
     93 	    CharacterOffset += 254;
     94 	}
     95 
     96         if (PartialNChars)
     97         {
     98 	    nbytes = PartialNChars + SIZEOF(xTextElt);
     99 	    BufAlloc (unsigned char *, tbuf, nbytes);
    100 /*    elt->delta = 0;
    101  *    elt->len = PartialNChars;
    102  */
    103             *(unsigned char *)tbuf =  PartialNChars;
    104             *(tbuf+1) = 0;
    105 /*     memcpy ((char *) (elt + 1), CharacterOffset, PartialNChars);
    106  */
    107          memcpy ((char *)tbuf+2, CharacterOffset, (size_t)PartialNChars);
    108 	 }
    109     }
    110 
    111     /* Pad request out to a 32-bit boundary */
    112 
    113     if (Datalength &= 3) {
    114 	char *pad;
    115 	/*
    116 	 * BufAlloc is a macro that uses its last argument more than
    117 	 * once, otherwise I'd write "BufAlloc (char *, pad, 4-length)"
    118 	 */
    119 	length = 4 - Datalength;
    120 	BufAlloc (char *, pad, length);
    121 	/*
    122 	 * if there are 3 bytes of padding, the first byte MUST be 0
    123 	 * so the pad bytes aren't mistaken for a final xTextElt
    124 	 */
    125 	*pad = 0;
    126         }
    127 
    128     /*
    129      * If the buffer pointer is not now pointing to a 32-bit boundary,
    130      * we must flush the buffer so that it does point to a 32-bit boundary
    131      * at the end of this routine.
    132      */
    133 
    134     if ((dpy->bufptr - dpy->buffer) & 3)
    135        _XFlush (dpy);
    136     UnlockDisplay(dpy);
    137     SyncHandle();
    138     return 0;
    139 }
    140