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ASME's Mechanical Engine…ing Toolkit 1997 December
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ASME's Mechanical Engineering Toolkit 1997 December.iso
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mark.c
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C/C++ Source or Header
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1988-06-07
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2KB
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132 lines
/*
* STevie - ST editor for VI enthusiasts.
*
* Extensive modifications by: Tony Andrews onecom!wldrdg!tony
*
*/
#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(c)
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()
{
pcmark.pos = *Curschar;
pcvalid = TRUE;
}
/*
* getmark(c) - find mark for char 'c'
*
* Return pointer to LPTR or NULL if no such mark.
*/
LPTR *
getmark(c)
char c;
{
register 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()
{
register 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 *line;
{
register 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;
}