Bug Summary

File:src/PolyTxt.c
Location:line 180, column 7
Description:Value stored to 'FirstTimeThrough' is never read

Annotated Source Code

1/*
2
3Copyright 1986, 1998 The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21Except as contained in this notice, the name of The Open Group shall not be
22used in advertising or otherwise to promote the sale, use or other dealings
23in this Software without prior written authorization from The Open Group.
24
25*/
26
27#ifdef HAVE_CONFIG_H1
28#include <config.h>
29#endif
30#include "Xlibint.h"
31
32int
33XDrawText(
34 register Display *dpy,
35 Drawable d,
36 GC gc,
37 int x,
38 int y,
39 XTextItem *items,
40 int nitems)
41{
42 register int i;
43 register XTextItem *item;
44 int length = 0;
45 register xPolyText8Req *req;
46
47 LockDisplay(dpy)if ((dpy)->lock_fns) (*(dpy)->lock_fns->lock_display
)(dpy);
48 FlushGC(dpy, gc)if ((gc)->dirty) _XFlushGCCache((dpy), (gc));
49 GetReq (PolyText8, req)req = (xPolyText8Req *) _XGetRequest(dpy, 74, 16);
50 req->drawable = d;
51 req->gc = gc->gid;
52 req->x = x;
53 req->y = y;
54
55 item = items;
56 for (i=0; i < nitems; i++) {
57 if (item->font)
58 length += 5; /* a 255 byte, plus size of Font id */
59 if (item->delta)
60 {
61 if (item->delta > 0)
62 {
63 length += SIZEOF(xTextElt)2 * ((item->delta + 126) / 127);
64 }
65 else
66 {
67 length += SIZEOF(xTextElt)2 * ((-item->delta + 127) / 128);
68 }
69 }
70 if (item->nchars > 0)
71 {
72 length += SIZEOF(xTextElt)2 * ((item->nchars + 253) / 254 - 1);
73 if (!item->delta) length += SIZEOF(xTextElt)2;
74 length += item->nchars;
75 }
76 item++;
77 }
78
79 req->length += (length + 3)>>2; /* convert to number of 32-bit words */
80
81
82 /*
83 * If the entire request does not fit into the remaining space in the
84 * buffer, flush the buffer first. If the request does fit into the
85 * empty buffer, then we won't have to flush it at the end to keep
86 * the buffer 32-bit aligned.
87 */
88
89 if (dpy->bufptr + length > dpy->bufmax)
90 _XFlush (dpy);
91
92 item = items;
93 for (i=0; i< nitems; i++) {
94
95 if (item->font) {
96 /* to mark a font shift, write a 255 byte followed by
97 the 4 bytes of font ID, big-end first */
98 register unsigned char *f;
99 BufAlloc (unsigned char *, f, 5)if (dpy->bufptr + (5) > dpy->bufmax) _XFlush (dpy); f
= (unsigned char *) dpy->bufptr; memset(f, '\0', 5); dpy->
bufptr += (5);;
100
101 f[0] = 255;
102 f[1] = (item->font & 0xff000000) >> 24;
103 f[2] = (item->font & 0x00ff0000) >> 16;
104 f[3] = (item->font & 0x0000ff00) >> 8;
105 f[4] = item->font & 0x000000ff;
106
107 /* update GC shadow */
108 gc->values.font = item->font;
109 }
110
111 {
112 int nbytes = SIZEOF(xTextElt)2;
113 int PartialNChars = item->nchars;
114 int PartialDelta = item->delta;
115 /* register xTextElt *elt; */
116 int FirstTimeThrough = True1;
117 char *CharacterOffset = item->chars;
118 char *tbuf = NULL((void*)0);
119
120 while((PartialDelta < -128) || (PartialDelta > 127))
121 {
122 int nb = SIZEOF(xTextElt)2;
123
124 BufAlloc (char *, tbuf, nb)if (dpy->bufptr + (nb) > dpy->bufmax) _XFlush (dpy);
tbuf = (char *) dpy->bufptr; memset(tbuf, '\0', nb); dpy->
bufptr += (nb);;
125 *tbuf = 0; /* elt->len */
126 if (PartialDelta > 0 )
127 {
128 *(tbuf+1) = 127; /* elt->delta */
129 PartialDelta = PartialDelta - 127;
130 }
131 else
132 {
133 /* -128 = 0x8, need to be careful of signed chars... */
134 *((unsigned char *)(tbuf+1)) = 0x80; /* elt->delta */
135 PartialDelta = PartialDelta + 128;
136 }
137 }
138 if (PartialDelta)
139 {
140 BufAlloc (char *, tbuf , nbytes)if (dpy->bufptr + (nbytes) > dpy->bufmax) _XFlush (dpy
); tbuf = (char *) dpy->bufptr; memset(tbuf, '\0', nbytes)
; dpy->bufptr += (nbytes);;
141 *tbuf = 0; /* elt->len */
142 *(tbuf+1) = PartialDelta; /* elt->delta */
143 }
144 while(PartialNChars > 254)
145 {
146 nbytes = 254;
147 if (FirstTimeThrough)
148 {
149 FirstTimeThrough = False0;
150 if (!item->delta)
151 {
152 nbytes += SIZEOF(xTextElt)2;
153 BufAlloc (char *, tbuf, nbytes)if (dpy->bufptr + (nbytes) > dpy->bufmax) _XFlush (dpy
); tbuf = (char *) dpy->bufptr; memset(tbuf, '\0', nbytes)
; dpy->bufptr += (nbytes);;
154 *(tbuf+1) = 0; /* elt->delta */
155 }
156 else
157 {
158 char *DummyChar;
159 BufAlloc(char *, DummyChar, nbytes)if (dpy->bufptr + (nbytes) > dpy->bufmax) _XFlush (dpy
); DummyChar = (char *) dpy->bufptr; memset(DummyChar, '\0'
, nbytes); dpy->bufptr += (nbytes);;
160 }
161 }
162 else
163 {
164 nbytes += SIZEOF(xTextElt)2;
165 BufAlloc (char *, tbuf, nbytes)if (dpy->bufptr + (nbytes) > dpy->bufmax) _XFlush (dpy
); tbuf = (char *) dpy->bufptr; memset(tbuf, '\0', nbytes)
; dpy->bufptr += (nbytes);;
166 *(tbuf+1) = 0; /* elt->delta */
167 }
168 /* watch out for signs on chars */
169 *(unsigned char *)tbuf = 254; /* elt->len */
170 memcpy (tbuf+2 , CharacterOffset, 254);
171 PartialNChars = PartialNChars - 254;
172 CharacterOffset += 254;
173
174 }
175 if (PartialNChars)
176 {
177 nbytes = PartialNChars;
178 if (FirstTimeThrough)
179 {
180 FirstTimeThrough = False0;
Value stored to 'FirstTimeThrough' is never read
181 if (!item->delta)
182 {
183 nbytes += SIZEOF(xTextElt)2;
184 BufAlloc (char *, tbuf, nbytes)if (dpy->bufptr + (nbytes) > dpy->bufmax) _XFlush (dpy
); tbuf = (char *) dpy->bufptr; memset(tbuf, '\0', nbytes)
; dpy->bufptr += (nbytes);;
185 *(tbuf+1) = 0; /* elt->delta */
186 }
187 else
188 {
189 char *DummyChar;
190 BufAlloc(char *, DummyChar, nbytes)if (dpy->bufptr + (nbytes) > dpy->bufmax) _XFlush (dpy
); DummyChar = (char *) dpy->bufptr; memset(DummyChar, '\0'
, nbytes); dpy->bufptr += (nbytes);;
191 }
192 }
193 else
194 {
195 nbytes += SIZEOF(xTextElt)2;
196 BufAlloc (char *, tbuf, nbytes)if (dpy->bufptr + (nbytes) > dpy->bufmax) _XFlush (dpy
); tbuf = (char *) dpy->bufptr; memset(tbuf, '\0', nbytes)
; dpy->bufptr += (nbytes);;
197 *(tbuf+1) = 0; /* elt->delta */
198 }
199 *tbuf = PartialNChars; /* elt->len */
200 memcpy (tbuf+2 , CharacterOffset, PartialNChars);
201 }
202 }
203 item++;
204 }
205
206 /* Pad request out to a 32-bit boundary */
207
208 if (length &= 3) {
209 char *pad;
210 /*
211 * BufAlloc is a macro that uses its last argument more than
212 * once, otherwise I'd write "BufAlloc (char *, pad, 4-length)"
213 */
214 length = 4 - length;
215 BufAlloc (char *, pad, length)if (dpy->bufptr + (length) > dpy->bufmax) _XFlush (dpy
); pad = (char *) dpy->bufptr; memset(pad, '\0', length); dpy
->bufptr += (length);;
216 /*
217 * if there are 3 bytes of padding, the first byte MUST be 0
218 * so the pad bytes aren't mistaken for a final xTextElt
219 */
220 *pad = 0;
221 }
222
223 /*
224 * If the buffer pointer is not now pointing to a 32-bit boundary,
225 * we must flush the buffer so that it does point to a 32-bit boundary
226 * at the end of this routine.
227 */
228
229 if ((dpy->bufptr - dpy->buffer) & 3)
230 _XFlush (dpy);
231 UnlockDisplay(dpy)if ((dpy)->lock_fns) (*(dpy)->lock_fns->unlock_display
)(dpy);
232 SyncHandle()if (dpy->synchandler) (*dpy->synchandler)(dpy);
233 return 0;
234 }