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CID 39934: Fix potential buffer overflow.

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This commit is contained in:
Renaud 2015-04-13 18:26:06 +08:00
parent e3b6d1e076
commit 4ac1913cd1
1 changed files with 31 additions and 53 deletions
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84
display.c
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@ -243,6 +243,17 @@ static void vtputc(int c)
++vtcol;
}
static int vtputs( const char *s) {
int n = 0 ;
while( *s) {
vtputc( *s++) ;
n += 1 ;
}
return n ;
}
/*
* Erase from the end of the software cursor to the end of the line on which
* the software cursor is located.
@ -1108,14 +1119,11 @@ static int updateline(int row, struct video *vp1, struct video *vp2)
*/
static void modeline(struct window *wp)
{
char *cp;
int c;
int n; /* cursor position count */
struct buffer *bp;
int i; /* loop index */
int lchar; /* character to draw line in buffer with */
int firstm; /* is this the first mode? */
char tline[NLINE]; /* buffer for part of mode line */
n = wp->w_toprow + wp->w_ntrows; /* Location. */
vscreen[n]->v_flag |= VFCHG | VFREQ | VFCOL; /* Redraw next time. */
@ -1154,64 +1162,37 @@ static void modeline(struct window *wp)
vtputc( ' ') ;
n = 3 ;
cp = PROGRAM_NAME_LONG " " VERSION ": " ;
while ((c = *cp++) != 0) {
vtputc(c);
++n;
}
cp = &bp->b_bname[0];
while ((c = *cp++) != 0) {
vtputc(c);
++n;
}
strcpy(tline, " (");
n += vtputs( PROGRAM_NAME_LONG " " VERSION ": ") ;
n += vtputs( bp->b_bname) ;
n += vtputs( " (") ;
/* display the modes */
firstm = TRUE;
if ((bp->b_flag & BFTRUNC) != 0) {
firstm = FALSE;
strcat(tline, "Truncated");
}
n += vtputs( "Truncated") ;
} else
firstm = TRUE ;
for (i = 0; i < NUMMODES; i++) /* add in the mode flags */
if (wp->w_bufp->b_mode & (1 << i)) {
if (firstm != TRUE)
strcat(tline, " ");
firstm = FALSE;
strcat( tline, modename[ i]) ;
}
strcat(tline, ") ");
n += vtputs( " ") ;
else
firstm = FALSE ;
cp = &tline[0];
while ((c = *cp++) != 0) {
vtputc(c);
++n;
}
n += vtputs( modename[ i]) ;
}
n += vtputs( ") ") ;
#if PKCODE
if (bp->b_fname[0] != 0 && strcmp(bp->b_bname, bp->b_fname) != 0)
if (bp->b_fname[0] != 0 && strcmp(bp->b_bname, bp->b_fname) != 0) {
#else
if (bp->b_fname[0] != 0) /* File name. */
if (bp->b_fname[0] != 0) { /* File name. */
n += vtputs( "File: ") ;
#endif
{
#if PKCODE == 0
cp = "File: ";
while ((c = *cp++) != 0) {
vtputc(c);
++n;
}
#endif
cp = &bp->b_fname[0];
while ((c = *cp++) != 0) {
vtputc(c);
++n;
}
n += vtputs( bp->b_fname) ;
vtputc(' ');
++n;
}
@ -1225,6 +1206,7 @@ static void modeline(struct window *wp)
struct line *lp = wp->w_linep;
int rows = wp->w_ntrows;
char *msg = NULL;
char tline[ 6] ; /* buffer for part of mode line */
vtcol = n - 7; /* strlen(" top ") plus a couple */
while (rows--) {
@ -1282,11 +1264,7 @@ static void modeline(struct window *wp)
}
}
cp = msg;
while ((c = *cp++) != 0) {
vtputc(c);
++n;
}
n += vtputs( msg) ;
}
}