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exm.c
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exm.c
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#include "ex.h"
/*
* Ex - a text editor
* Bill Joy UCB June/August 1977
*/
static int getcopy(void);
static int getPUT(void);
void
move(void)
{
register int *adt;
if (Command[0] == 'M') {
setdot1();
markpr(addr2 == dot ? addr1 - 1 : addr2 + 1);
} else
setdot();
nonzero();
adt = address();
if (adt == 0)
error("%s where?|%s requires a trailing address", Command);
ex_newline();
move1(Command[0] != 'M', adt);
killed();
}
int *tad1;
void
move1(char cflag, int *addrt)
{
register int *adt, *ad1, *ad2;
int lines;
adt = addrt;
lines = (addr2 - addr1) + 1;
if (cflag) {
tad1 = addr1;
ad1 = dol;
append(getcopy, ad1++);
ad2 = dol;
} else {
ad2 = addr2;
for (ad1 = addr1; ad1 <= ad2;)
*ad1++ &= ~01;
ad1 = addr1;
}
ad2++;
if (adt < ad1) {
if (adt + 1 == ad1 && !cflag)
error("That move would do nothing!");
dot = adt + (ad2 - ad1);
if (++adt != ad1) {
reverse(adt, ad1);
reverse(ad1, ad2);
reverse(adt, ad2);
}
} else if (adt >= ad2) {
dot = adt++;
reverse(ad1, ad2);
reverse(ad2, adt);
reverse(ad1, adt);
} else
error("Move to a moved line");
change();
if (!inglobal) {
if (cflag) {
undap1 = addrt + 1;
undap2 = undap1 + lines;
deletenone();
} else {
undkind = UNDMOVE;
undap1 = addr1;
undap2 = addr2;
unddel = addrt;
unddol = dol;
}
}
}
void
reverse(int *a1, int *a2)
{
register int t;
for (;;) {
t = *--a2;
if (a2 <= a1)
return;
*a2 = *a1;
*a1++ = t;
}
}
static int
getcopy(void)
{
if (tad1 > addr2)
return (EOF);
ex_getline(*tad1++);
return (0);
}
static int
getPUT(void)
{
if (tad1 > unddol)
return (EOF);
ex_getline(*tad1++);
tad1++;
return (0);
}
void
yank(void)
{
save12();
undkind = UNDNONE;
killed();
}
void
PUT(void)
{
register int cnt;
cnt = unddol - dol;
tad1 = dol + 1;
append(getPUT, addr2);
netchange(cnt);
}