/* the position of the trailer */
int pdf_trailer(char *pdf, int len)
{
int pos = prevline(pdf, len, len); /* %%EOF */
while (!startswith(pdf + pos, "trailer"))
if ((pos = prevline(pdf, len, pos)) < 0)
return -1;
return nextline(pdf, len, pos); /* skip trailer\n */
}
/* the position of the last xref table */
static int pdf_xref(char *pdf, int len)
{
int pos = prevline(pdf, len, len); /* %%EOF */
if ((pos = prevline(pdf, len, pos)) < 0)
return -1;
/* read startxref offset */
if (sscanf(pdf + pos, "%d", &pos) != 1 || pos >= len || pos < 0)
return -1;
return nextline(pdf, len, pos); /* skip xref\n */
}
void
Buffer::update(int ch)
{
switch (ch) {
case KEY_UP:
prevline();
break;
case KEY_DOWN:
nextline();
break;
case KEY_RIGHT:
nextchar();
break;
case KEY_LEFT:
prevchar();
break;
case KEY_HOME:
begofline();
break;
case KEY_END:
endofline();
break;
case 127:
delchar();
break;
case '\n':
case '\r':
newline();
break;
default:
addchar(ch);
}
}
/*
* gotoline(n) - return a pointer to line 'n'
*
* Returns a pointer to the last line of the file if n is zero, or beyond the
* end of the file.
*/
LPtr *
gotoline(int n)
{
static LPtr l;
l.index = 0;
if (n == 0)
l = *prevline(Fileend);
else {
LPtr *p;
for (l = *Filemem; --n > 0; l = *p)
if ((p = nextline(&l)) == NULL)
break;
}
return &l;
}
void
cursupdate()
{
LPTR *p;
int inc, c, nlines;
int i;
int didinc;
if (bufempty()) { /* special case - file is empty */
*Topchar = *Filemem;
*Curschar = *Filemem;
} else if ( LINEOF(Curschar) < LINEOF(Topchar) ) {
nlines = cntllines(Curschar,Topchar);
/* if the cursor is above the top of */
/* the screen, put it at the top of the screen.. */
*Topchar = *Curschar;
Topchar->index = 0;
/* ... and, if we weren't very close to begin with, */
/* we scroll so that the line is close to the middle. */
if ( nlines > Rows/3 ) {
for (i=0, p = Topchar; i < Rows/3 ;i++, *Topchar = *p)
if ((p = prevline(p)) == NULL)
break;
} else
s_ins(0, nlines-1);
updatescreen();
}
else if (LINEOF(Curschar) >= LINEOF(Botchar)) {
nlines = cntllines(Botchar,Curschar);
/* If the cursor is off the bottom of the screen, */
/* put it at the top of the screen.. */
/* ... and back up */
if ( nlines > Rows/3 ) {
p = Curschar;
for (i=0; i < (2*Rows)/3 ;i++)
if ((p = prevline(p)) == NULL)
break;
*Topchar = *p;
} else {
scrollup(nlines);
}
updatescreen();
}
Cursrow = Curscol = Cursvcol = 0;
for ( p=Topchar; p->linep != Curschar->linep ;p = nextline(p) )
Cursrow += plines(p);
Cline_row = Cursrow;
Cline_size = plines(p);
for (i=0; i <= Curschar->index ;i++) {
c = Curschar->linep->s[i];
/* A tab gets expanded, depending on the current column */
if ( c == TAB && !P(P_LS) )
inc = P(P_TS) - (Curscol % P(P_TS));
else
inc = chars[(unsigned)(c & 0xff)].ch_size;
Curscol += inc;
Cursvcol += inc;
if ( Curscol >= Columns ) {
Curscol -= Columns;
Cursrow++;
didinc = TRUE;
}
else
didinc = FALSE;
}
if (didinc)
Cursrow--;
if (c == TAB && State == NORMAL && !P(P_LS)) {
Curscol--;
Cursvcol--;
} else {
Curscol -= inc;
Cursvcol -= inc;
}
if (Curscol < 0)
Curscol += Columns;
if (set_want_col) {
Curswant = Cursvcol;
set_want_col = FALSE;
}
}
