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121 lines
2.3 KiB
121 lines
2.3 KiB
/* $Header: /nw/tony/src/stevie/src/RCS/mark.c,v 1.3 89/03/11 22:42:39 tony Exp $
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*
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* Routines to save and retrieve marks.
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*/
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#include "stevie.h"
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#define NMARKS 10 /* max. # of marks that can be saved */
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struct mark {
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char name;
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LNPTR pos;
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};
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static struct mark mlist[NMARKS];
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static struct mark pcmark; /* previous context mark */
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static bool_t pcvalid = FALSE; /* true if pcmark is valid */
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/*
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* setmark(c) - set mark 'c' at current cursor position
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*
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* Returns TRUE on success, FALSE if no room for mark or bad name given.
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*/
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bool_t
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setmark(c)
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register char c;
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{
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register int i;
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if (!isalpha(c))
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return FALSE;
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/*
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* If there is already a mark of this name, then just use the
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* existing mark entry.
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*/
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for (i=0; i < NMARKS ;i++) {
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if (mlist[i].name == c) {
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mlist[i].pos = *Curschar;
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return TRUE;
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}
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}
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/*
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* There wasn't a mark of the given name, so find a free slot
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*/
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for (i=0; i < NMARKS ;i++) {
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if (mlist[i].name == NUL) { /* got a free one */
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mlist[i].name = c;
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mlist[i].pos = *Curschar;
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return TRUE;
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}
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}
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return FALSE;
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}
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/*
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* setpcmark() - set the previous context mark to the current position
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*/
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void
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setpcmark()
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{
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pcmark.pos = *Curschar;
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pcvalid = TRUE;
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}
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/*
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* getmark(c) - find mark for char 'c'
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*
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* Return pointer to LNPTR or NULL if no such mark.
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*/
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LNPTR *
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getmark(c)
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register char c;
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{
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register int i;
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if (c == '\'' || c == '`') /* previous context mark */
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return pcvalid ? &(pcmark.pos) : (LNPTR *) NULL;
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for (i=0; i < NMARKS ;i++) {
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if (mlist[i].name == c)
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return &(mlist[i].pos);
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}
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return (LNPTR *) NULL;
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}
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/*
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* clrall() - clear all marks
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*
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* Used mainly when trashing the entire buffer during ":e" type commands
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*/
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void
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clrall()
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{
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register int i;
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for (i=0; i < NMARKS ;i++)
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mlist[i].name = NUL;
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pcvalid = FALSE;
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}
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/*
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* clrmark(line) - clear any marks for 'line'
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*
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* Used any time a line is deleted so we don't have marks pointing to
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* non-existent lines.
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*/
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void
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clrmark(line)
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register LINE *line;
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{
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register int i;
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for (i=0; i < NMARKS ;i++) {
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if (mlist[i].pos.linep == line)
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mlist[i].name = NUL;
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}
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if (pcvalid && (pcmark.pos.linep == line))
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pcvalid = FALSE;
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}
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