gno/bin/vi/mark.c

130 lines
2.5 KiB
C
Raw Normal View History

/*
* STEVIE - Simply Try this Editor for VI Enthusiasts
*
* Code Contributions By : Tim Thompson twitch!tjt
* Tony Andrews onecom!wldrdg!tony
* G. R. (Fred) Walter watmath!grwalter
*/
#include "stevie.h"
#ifdef MEGAMAX
overlay "mark"
#endif
/*
* This file contains routines to maintain and manipulate marks.
*/
#define NMARKS 10 /* max. # of marks that can be saved */
struct mark {
char name;
LPtr pos;
};
static struct mark mlist[NMARKS];
static struct mark pcmark; /* previous context mark */
static bool_t pcvalid = FALSE;/* true if pcmark is valid */
/*
* setmark(c) - set mark 'c' at current cursor position
*
* Returns TRUE on success, FALSE if no room for mark or bad name given.
*/
bool_t
setmark(char c)
{
int i;
if (!isalpha(c))
return FALSE;
/*
* If there is already a mark of this name, then just use the existing
* mark entry.
*/
for (i = 0; i < NMARKS; i++) {
if (mlist[i].name == c) {
mlist[i].pos = *Curschar;
return TRUE;
}
}
/*
* There wasn't a mark of the given name, so find a free slot
*/
for (i = 0; i < NMARKS; i++) {
if (mlist[i].name == NUL) { /* got a free one */
mlist[i].name = c;
mlist[i].pos = *Curschar;
return TRUE;
}
}
return FALSE;
}
/*
* setpcmark() - set the previous context mark to the current position
*/
void
setpcmark(void)
{
pcmark.pos = *Curschar;
pcvalid = TRUE;
}
/*
* getmark(c) - find mark for char 'c'
*
* Return pointer to LPtr or NULL if no such mark.
*/
LPtr *
getmark(char c)
{
int i;
if (c == '\'' || c == '`') /* previous context mark */
return pcvalid ? &(pcmark.pos) : (LPtr *) NULL;
for (i = 0; i < NMARKS; i++) {
if (mlist[i].name == c)
return &(mlist[i].pos);
}
return (LPtr *) NULL;
}
/*
* clrall() - clear all marks
*
* Used mainly when trashing the entire buffer during ":e" type commands
*/
void
clrall(void)
{
int i;
for (i = 0; i < NMARKS; i++)
mlist[i].name = NUL;
pcvalid = FALSE;
}
/*
* clrmark(line) - clear any marks for 'line'
*
* Used any time a line is deleted so we don't have marks pointing to
* non-existent lines.
*/
void
clrmark(LINE *line)
{
int i;
for (i = 0; i < NMARKS; i++) {
if (mlist[i].pos.linep == line)
mlist[i].name = NUL;
}
if (pcvalid && (pcmark.pos.linep == line))
pcvalid = FALSE;
}