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FBUF.C
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/* FBUF.C -- Buffer Managment
Written March 1991 by Craig A. Finseth
Copyright 1991,2,3,4 by Craig A. Finseth
*/
#include "freyja.h"
#if defined(UNIX)
#include <sys/types.h>
#include <sys/stat.h>
#endif
struct phys_page {
char page_data[PAGESIZE]; /* the page */
struct phys_page *next; /* LRU chain */
struct phys_page *prev;
char page_loc; /* logical location of page */
int page_num;
FLAG is_mod; /* is the page dirty? */
struct virt_page *pptr; /* page description for this page */
};
/* cached information on the current page */
static struct virt_page *cur_page; /* virtual page */
static int cur_pt_offset; /* point offset */
static int cur_page_len; /* page length */
static char *cur_cptr; /* actual character */
static char *cur_page_start; /* start of the page */
static char *cur_gap_start; /* position of the gap */
static char *cur_gap_end;
static FLAG cur_is_mod; /* is modified (dirty) */
static int cur_col = -1; /* current column position */
static int savecol;
struct mark *getmark;
static struct virt_page vp[SWAPMAX];
static struct mark marks[MAXMARK];
#define MAXSMARK (sizeof(screenmarks) / sizeof(screenmarks[0]))
static struct mark screenmarks[ROWMAX + 2];
#if defined(MSDOS)
static unsigned swap_base;
#else
static char *swap_base;
#endif
static struct phys_page pages[NUM_PHYS_PAGES]; /* page descriptors */
static struct phys_page *first_phys_page; /* LRU chain of pages in memory */
static struct phys_page *last_phys_page;
#define SWAPMAPSIZE ((long)SWAPMAX * 1024 / PAGESIZE)
static char swap_map[SWAPMAPSIZE]; /* swap file in use flags */
static int num_swap; /* number of swap file pages */
void B_FileReadCheck(void);
void B_GetGap(void);
int B_IndexB(char *array, int len, char chr);
int B_IndexF(char *array, int len, char chr);
FLAG B_InsChar(char new);
void B_MarkUpdate(struct virt_page *new_page, int amt, int new_offset);
void B_MarkUpdateNP(struct virt_page *new_page, int new_offset);
void B_MovePointTo(int dist);
struct virt_page * B_PageAllocate(struct buffer *bptr, struct virt_page *prev,
struct virt_page *next);
struct phys_page *B_PageFindFree(void);
void B_PageFree(struct buffer *bptr, struct virt_page *pptr);
FLAG B_PageSplit(int amount);
void B_PageToMemory(struct virt_page *pptr);
void B_PageToCurrent(struct virt_page *pptr);
void B_RulerLine(void);
void B_SetScreenMarks(FLAG newflag);
void B_SetScreenMarks2(struct window *wptr, FLAG newflag);
/* ------------------------------------------------------------ */
/* Initialize the buffer abstraction. Return TRUE on success or FALSE
on failure. */
FLAG
BInit(int swap_size)
{
struct phys_page *pptr;
int cnt;
if (swap_size > SWAPMAX) swap_size = SWAPMAX;
cbuf = NULL;
cur_page = NULL;
for (pptr = pages; pptr < &pages[NUM_PHYS_PAGES]; ++pptr) {
pptr->page_loc = 'M';
pptr->is_mod = FALSE;
pptr->next = pptr + 1;
pptr->prev = pptr - 1;
}
first_phys_page = pages;
first_phys_page->prev = NULL;
last_phys_page = pptr - 1;
last_phys_page->next = NULL;
getmark = BMarkCreate();
for (cnt = 0; cnt < MAXMARK; cnt++) marks[cnt].pptr = NULL;
for (cnt = 0; cnt < MAXSMARK; cnt++) screenmarks[cnt].pptr = NULL;
for (cnt = 0; cnt < NUMBUFFERS; cnt++) buffers[cnt].num_pages = 0;
for (cnt = 0; cnt < SWAPMAPSIZE; cnt++) swap_map[cnt] = 0;
num_swap = ((long)swap_size * 1024) / PAGESIZE;
#if defined(MSDOS)
/* 64 = 1024 / 16 */
#if defined(SYSMGR)
swap_base = JAlloc(swap_size * 64);
#else
swap_base = SwapAlloc(swap_size * 64);
#endif
return(swap_base != 0);
#endif
#if defined(UNIX)
swap_base = (char *)malloc(swap_size * 1024);
return(swap_base != NULL);
#endif
}
/* ------------------------------------------------------------ */
/* Terminate the buffer abstraction. */
void
BFini(void)
{
#if defined(MSDOS)
#if defined(SYSMGR)
JFree(swap_base);
#else
SwapFree(swap_base);
#endif
#endif
#if defined(UNIX)
free(swap_base);
#endif
}
/* ------------------------------------------------------------ */
/* Create a buffer. Returns a pointer to the buffer descriptor or NULL. */
struct buffer *
BBufCreate(char *fname)
{
struct buffer *bptr;
if (cbuf == NULL) {
for (bptr = buffers; bptr < &buffers[NUMBUFFERS]; bptr++) {
if (BIsFree(bptr)) break;
}
if (bptr >= &buffers[NUMBUFFERS]) {
DError(RES_NOFREE);
return(NULL);
}
}
else {
for (bptr = cbuf + 1; bptr != cbuf; bptr++) {
if (bptr > &buffers[NUMBUFFERS]) bptr = buffers;
if (BIsFree(bptr)) break;
}
if (bptr == cbuf) {
DError(RES_NOFREE);
return(NULL);
}
}
/* copy parameters from previous buffer */
bptr->c = (cbuf == NULL) ? c.d : cbuf->c;
xstrcpy(bptr->fname, fname);
bptr->num_pages = 0;
bptr->is_mod = FALSE;
bptr->point_offset = 0;
bptr->mptr = NULL;
if ((bptr->point_page = B_PageAllocate(bptr, NULL, NULL)) == NULL)
return(NULL);
B_PageToMemory(bptr->point_page);
BBufGoto(bptr);
bptr->mptr = BMarkCreate();
mark = bptr->mptr;
return(bptr);
}
/* ------------------------------------------------------------ */
/* Delete the buffer and all associated pages. If no non-system
buffers are left, re-create scratch. */
void
BBufDelete(void)
{
struct buffer *bptr;
if (strequ(cbuf->fname, Res_String(NULL, RES_MSGS, RES_SYSKILL))) {
DError(RES_NODELKILL);
return;
}
while (cbuf->first != NULL) B_PageFree(cbuf, cbuf->first);
cbuf->num_pages = 0;
cur_page = NULL;
savecol = -1;
BMarkDelete(cbuf->mptr);
/* go to the previous buffer */
for (bptr = cbuf; 1; ) {
if (bptr == buffers) bptr = &buffers[NUMBUFFERS];
bptr--;
if (bptr == cbuf) break;
if (BIsFree(bptr)) continue;
if (c.g.skip_system && !isuarg && IS_SYS(bptr->fname)) continue;
cbuf = NULL;
BBufGoto(bptr);
return;
}
cbuf = NULL;
BBufCreate(Res_String(NULL, RES_MSGS, RES_SYSSCRATCH));
}
/* ------------------------------------------------------------ */
/* Locate a buffer with a buffer name of exactly NAME (preferred) or
starting with NAME (backup). */
struct buffer *
BBufFind(char *name)
{
struct buffer *bptr;
for (bptr = cbuf + 1; 1; bptr++) {
if (bptr >= &buffers[NUMBUFFERS]) bptr = buffers;
if (!BIsFree(bptr) && strequ(name, bptr->fname)) return(bptr);
if (bptr == cbuf) break;
}
for (bptr = cbuf + 1; 1; bptr++) {
if (bptr >= &buffers[NUMBUFFERS]) bptr = buffers;
if (!BIsFree(bptr) && strnequ(name, bptr->fname, strlen(name)))
return(bptr);
if (bptr == cbuf) break;
}
return(NULL);
}
/* ------------------------------------------------------------ */
/* Switch to the specified buffer. */
void
BBufGoto(struct buffer *bptr)
{
if (bptr == NULL || bptr->num_pages == 0) {
DError(RES_NOTBUFF);
return;
}
if (cbuf != NULL) {
cbuf->point_page = cur_page;
cbuf->point_offset = cur_pt_offset;
}
B_PageToCurrent(bptr->point_page);
B_MovePointTo(bptr->point_offset);
cbuf = bptr;
cur_col = -1;
mark = cbuf->mptr;
}
/* ------------------------------------------------------------ */
/* Clear the current buffer's modified flag. */
void
BBufUnmod(void)
{
cbuf->is_mod = FALSE;
}
/* ------------------------------------------------------------ */
/* Change the current character to TO. */
void
BCharChange(char to)
{
if (!BIsEnd()) {
*cur_cptr = to;
cbuf->is_mod = TRUE;
cur_is_mod = TRUE;
B_SetScreenMarks(FALSE);
BMoveBy(1);
}
else BInsChar(to);
}
/* ------------------------------------------------------------ */
/* Delete AMOUNT characters. If AMOUNT is negative, delete backwards. */
void
BCharDelete(int amount)
{
int num = amount;
int tmp;
struct mark *mptr;
struct virt_page *vpage;
if (amount == 0) return;
B_GetGap();
if (cur_pt_offset + amount > cur_page_len)
num = cur_page_len - cur_pt_offset;
if (num < 0) num = 0;
cur_gap_end += num;
cur_page_len -= num;
if (cur_page == cbuf->last) amount = num;
amount -= num;
cbuf->is_mod = TRUE;
cur_is_mod = TRUE;
if (cur_page_len == 0 &&
(cur_page->next != NULL || cur_page->prev != NULL)) {
vpage = cur_page->next;
tmp = 0;
if (vpage == NULL) {
vpage = cur_page->prev;
tmp = vpage->page_len;
}
B_MarkUpdateNP(vpage, tmp);
B_PageFree(cbuf, cur_page);
cur_page = NULL;
}
else {
vpage = cur_page;
tmp = cur_pt_offset;
if (tmp >= cur_page_len && cur_page->next) {
vpage = cur_page->next;
tmp = 0;
}
B_MarkUpdate(vpage, num, tmp);
}
B_PageToCurrent(vpage);
B_MovePointTo(tmp);
if (amount != 0)
BCharDelete(amount);
else B_SetScreenMarks(TRUE);
}
/* ------------------------------------------------------------ */
/* Load the buffer with the current file. */
FLAG
BFileRead(void)
{
int fd;
int len;
int chr;
int amt;
int col;
long there;
struct mark *mptr;
#if defined(UNIX)
struct stat statbuf;
#endif
#if defined(MSDOS)
FLAG cr_found = FALSE;
#endif
FLAG ok = TRUE;
B_PageToCurrent(cbuf->first);
while (cur_page->next != NULL) B_PageFree(cbuf, cur_page->next);
for (mptr = marks; mptr < &marks[MAXMARK]; ++mptr) {
if (mptr->pptr && mptr->bptr == cbuf) {
mptr->pptr = cur_page;
mptr->mark_offset = 0;
mptr->is_mod = TRUE;
}
}
for (mptr = screenmarks; mptr < &screenmarks[MAXSMARK]; ++mptr) {
if (mptr->pptr != NULL && mptr->bptr == cbuf) {
mptr->pptr = cur_page;
mptr->mark_offset = 0;
mptr->is_mod = TRUE;
}
}
#if defined(MSDOS)
#define O_RDONLY 0 /* dummy */
if ((fd = open(cbuf->fname, O_RDONLY)) < 0) {
#endif
#if defined(UNIX)
if ((fd = open(cbuf->fname, O_RDONLY, 0)) < 0) {
#endif
cur_gap_start = cur_page_start;
cur_gap_end = cur_page_start + PAGESIZE;
cur_page_len = 0;
B_MovePointTo(0);
cur_is_mod = FALSE;
cbuf->is_mod = FALSE;
cur_col = 0;
#if defined(UNIX)
cbuf->file_time = 0;
#endif
return(TRUE);
}
while ((len = read(fd, cur_page_start, PAGESIZE)) > 0) {
cur_gap_start = cur_page_start + len;
cur_gap_end = cur_page_start + PAGESIZE;
cur_page_len = len;
B_MovePointTo(0);
cur_is_mod = TRUE;
#if defined(MSDOS)
if (!isuarg && cr_found && *cur_cptr == LF) {
*cur_page_start = NL;
--(cur_page->prev->page_len);
--(cur_page->prev->gap_start);
}
cr_found = FALSE;
while (cur_pt_offset < cur_page_len) {
if (!isuarg && *cur_cptr == CR) {
B_MovePointTo(cur_pt_offset + 1);
B_GetGap();
if (cur_pt_offset >= cur_page_len)
cr_found = TRUE;
else if (*cur_cptr == LF) {
--cur_gap_start;
--cur_page_len;
*cur_gap_end = NL;
}
B_MovePointTo(cur_pt_offset - 1);
}
B_MovePointTo(cur_pt_offset + 1);
}
#else
B_MovePointTo(cur_page_len);
#endif
if (len < PAGESIZE) break;
if (B_PageAllocate(cbuf, cur_page, NULL) == NULL) {
ok = FALSE;
break;
}
B_PageToCurrent(cur_page->next);
B_MovePointTo(0);
}
if (len < 0) ok = FALSE;
#if defined(UNIX)
fstat(fd, &statbuf);
cbuf->file_time = statbuf.st_mtime;
#endif
close(fd);
if (cur_pt_offset == 0 && cur_page != cbuf->first) {
B_PageFree(cbuf, cur_page);
cur_page = NULL;
}
else {
B_GetGap();
cur_gap_end = cur_page_start + PAGESIZE;
cur_page_len = cur_pt_offset;
}
B_PageToCurrent(cbuf->first);
B_MovePointTo(0);
cur_col = 0;
cbuf->is_mod = FALSE;
if (cbuf->c.fill == 'W') {
col = 0;
while (!BIsEnd()) {
chr = BGetCharAdv();
if (chr == NL) {
there = BGetLocation();
col = 0;
}
else if (chr == TAB) {
col += TGetTabWidth(col);
}
else if (chr == SP) {
there = BGetLocation();
col++;
}
else if (col >= cbuf->c.right_margin) {
amt = BGetLocation() - there + 1;
BMoveBy(-amt);
BCharChange(SNL);
BMoveBy(amt);
col = amt;
}
else {
col++;
}
}
BMoveToStart();
}
if (Res_Char(RES_CONF, RES_RULERCHECK) == 'Y') B_FileReadCheck();
return(ok);
}
/* ------------------------------------------------------------ */
/* Write the buffer to its file. */
FLAG
BFileWrite(void)
{
struct virt_page *vpage;
int fd;
int len;
FLAG was_err;
char *cptr;
char buf[PAGESIZE];
char bname[FNAMEMAX];
char chr;
#if defined(UNIX)
struct stat statbuf;
#endif
if (Res_Char(RES_CONF, RES_BACKUP) == 'Y') {
xstrcpy(bname, cbuf->fname);
PSetExt(bname, "BAK", TRUE);
unlink(bname);
rename(cbuf->fname, bname);
}
#if defined(MSDOS)
if ((fd = creat(cbuf->fname, 0666)) < 0) return(FALSE);
#endif
#if defined(UNIX)
if (stat(cbuf->fname, &statbuf) >= 0) {
if ((cbuf->file_time != 0 &&
(cbuf->file_time != statbuf.st_mtime)) &&
!KAsk(RES_ASKOVER))
return(FALSE);
}
if ((fd = open(cbuf->fname, O_WRONLY | O_TRUNC | O_CREAT, 0666)) < 0)
return(FALSE);
#endif
BMarkToPoint(cwin->point);
cptr = buf;
for (vpage = cbuf->first, was_err = FALSE;
vpage != NULL && !was_err; ) {
B_PageToCurrent(vpage);
B_MovePointTo(0);
vpage = cur_page->next;
while (cur_pt_offset < cur_page_len) {
chr = *cur_cptr;
if (chr == SNL) {
*cptr++ = (cbuf->c.fill == 'W') ? SP : SNL;
}
#if defined(MSDOS)
else if (!isuarg && chr == NL) {
*cptr++ = CR;
if (cptr >= &buf[PAGESIZE]) {
was_err = write(fd, buf, PAGESIZE)
!= PAGESIZE;
if (was_err) break;
cptr = buf;
}
*cptr++ = LF;
}
#endif
else {
*cptr++ = chr;
}
if (cptr >= &buf[PAGESIZE]) {
was_err = write(fd, buf, PAGESIZE) != PAGESIZE;
if (was_err) break;
cptr = buf;
}
B_MovePointTo(cur_pt_offset + 1);
}
}
len = cptr - buf;
if (was_err || len != write(fd, buf, len))
DError(RES_ERRWRITE);
else cbuf->is_mod = FALSE;
#if defined(UNIX)
fstat(fd,&statbuf);
cbuf->file_time = statbuf.st_mtime;
#endif
close(fd);
BPointToMark(cwin->point);
return(TRUE);
}
/* ------------------------------------------------------------ */
/* Write out one modified page. */
void
BFlush(void)
{
struct phys_page *ppage;
for (ppage = last_phys_page; ppage->prev != NULL &&
(ppage->page_loc != 'S' || !ppage->is_mod);
ppage = ppage->prev) ;
if (ppage->prev == NULL) return;
if (ppage->pptr->page_len != 0) {
#if defined(MSDOS)
#if defined(SYSMGR)
char huge *tmp = (char huge *) (
((long)swap_base << 16) +
((long)_DS << 16) );
#else
char huge *tmp = (char huge *)((long)swap_base << 16);
#endif
PagePut(tmp + ((long)ppage->page_num) * PAGESIZE,
ppage->page_data, PAGESIZE);
#endif
#if defined(UNIX)
memmove(swap_base + ppage->page_num * PAGESIZE,
ppage->page_data, PAGESIZE);
#endif
}
ppage->is_mod = FALSE;
}
/* ------------------------------------------------------------ */
/* Return the current character. */
char
BGetChar(void)
{
return(*cur_cptr);
}
/* ------------------------------------------------------------ */
/* Return the current character and move the point by 1 char. Same as
c = BGetChar(); BMoveBy(1);, but optimized for speed. */
char
BGetCharAdv(void)
{
int num;
char chr = *cur_cptr;
if (cur_pt_offset >= cur_page_len) return(chr);
if (chr == NL || chr == SNL)
cur_col = 0;
else if (cur_col >= 0) {
cur_col += (chr == TAB) ? TGetTabWidth(cur_col) :
TGetWidth(chr);
}
if (++cur_pt_offset < cur_page_len) {
if (++cur_cptr == cur_gap_start) cur_cptr = cur_gap_end;
return(chr);
}
--cur_pt_offset;
num = cur_pt_offset + 1;
if (num >= 0 && num < cur_page_len) {
B_MovePointTo(num);
return(chr);
}
if (num >= cur_page_len && cbuf->last == cur_page) {
B_MovePointTo(cur_page_len);
return(chr);
}
if (num < 0) {
if (cur_page == cbuf->first) {
B_MovePointTo(0);
return(chr);
}
B_PageToCurrent(cur_page->prev);
B_MovePointTo(cur_page_len);
}
else {
num -= cur_page_len; /* must use this cur_page_len */
B_PageToCurrent(cur_page->next);
B_MovePointTo(0);
}
if (num != 0) BMoveBy(num);
return(chr);
}
/* ------------------------------------------------------------ */
/* Return the current column. */
int
BGetCol(void)
{
if (cur_col >= 0) return(cur_col);
if (cur_pt_offset > cur_page_len) {
cur_col = 0;
return(0);
}
BMarkToPoint(getmark);
if (BSearchB(NL, SNL)) BMoveBy(1);
cur_col = 0;
while (BIsBeforeMark(getmark)) BMoveBy(1);
return(cur_col);
}
/* ------------------------------------------------------------ */
/* Returns the buffer's length. */
long
BGetLength(struct buffer *bptr)
{
long len;
struct virt_page *vpage;
len = 0;
for (vpage = bptr->first; vpage != NULL; vpage = vpage->next) {
if (vpage == cur_page)
len += cur_page_len;
else len += vpage->page_len;
}
return(len);
}
/* ------------------------------------------------------------ */
/* Return the current point location. */
long
BGetLocation(void)
{
long len;
struct virt_page *vpage;
len = 0;
for (vpage = cbuf->first; vpage != cur_page; vpage = vpage->next)
len += vpage->page_len;
return(len + cur_pt_offset);
}
/* ------------------------------------------------------------ */
/* Insert the specified character into the buffer. Return True on
success or False on buffer full. */
FLAG
BInsChar(char chr)
{
FLAG ok;
ok = B_InsChar(chr);
B_SetScreenMarks(FALSE);
return(ok);
}
/* ------------------------------------------------------------ */
/* Insert AMT spaces. */
void
BInsSpaces(int amt)
{
while (amt-- > 0) B_InsChar(SP);
B_SetScreenMarks(FALSE);
}
/* ------------------------------------------------------------ */
/* Insert the string into the buffer. Return True on success or False
on buffer full. */
FLAG
BInsStr(char *str)
{
FLAG ok = TRUE;
while (*str != NUL) {
if (!B_InsChar(*str++)) {
ok = FALSE;
break;
}
}
B_SetScreenMarks(FALSE);
return(ok);
}
/* ------------------------------------------------------------ */
/* Put in the right number of tabs and spaces */
void
BInsTabSpaces(int amt)
{
for ( ; amt >= cbuf->c.tab_spacing; amt -= cbuf->c.tab_spacing) {
B_InsChar(TAB);
}
BInsSpaces(amt);
}
/* ------------------------------------------------------------ */
/* Put the point in a special, repeatable invalid state off the end of
the buffer. */
void
BInvalid(void)
{
B_PageToCurrent(cbuf->last);
B_MovePointTo(cur_page_len + 1);
cur_col = -1;
}
/* ------------------------------------------------------------ */
/* Is the point after the mark? */
FLAG
BIsAfterMark(struct mark *mptr)
{
struct virt_page *vpage;
if (mptr->pptr == NULL || mptr->bptr != cbuf) {
DError(RES_BADMARK);
return(FALSE);
}
if (mptr->pptr == cur_page) return(cur_pt_offset > mptr->mark_offset);
for (vpage = cur_page; vpage && vpage != mptr->pptr;
vpage = vpage->prev);
return(vpage != NULL);
}
/* ------------------------------------------------------------ */
/* Is the point at the mark? */
FLAG
BIsAtMark(struct mark *mptr)
{
return(mptr->pptr == cur_page && mptr->mark_offset == cur_pt_offset);
}
/* ------------------------------------------------------------ */
/* Is the point before the mark? */
FLAG
BIsBeforeMark(struct mark *mptr)
{
struct virt_page *vpage;
if (mptr->pptr == NULL || mptr->bptr != cbuf) {
DError(RES_BADMARK);
return(FALSE);
}
if (mptr->pptr == cur_page) return(cur_pt_offset < mptr->mark_offset);
for (vpage = cur_page; vpage != NULL && vpage != mptr->pptr;
vpage = vpage->next);
return(vpage != NULL);
}
/* ------------------------------------------------------------ */
/* Is the point at the end of the buffer? */
FLAG
BIsEnd(void)
{
return(cur_pt_offset >= cur_page_len && cur_page == cbuf->last);
}
/* ------------------------------------------------------------ */
/* Return True if the buffer is free, or False if it is in use. */
FLAG
BIsFree(struct buffer *bptr)
{
return(bptr->num_pages == 0);
}
/* ------------------------------------------------------------ */
/* Has the buffer been modified? */
FLAG
BIsMod(struct buffer *bptr)
{
return(bptr->is_mod);
}
/* ------------------------------------------------------------ */
/* Is the point at the beginning of the buffer? */
FLAG
BIsStart(void)
{
return(cur_pt_offset == 0 && cur_page == cbuf->first);
}
/* ------------------------------------------------------------ */
/* Put the cursor in specific column, rounding. */
void
BMakeColB(int col)
{
int old_col;
if (BSearchB(NL, SNL)) BMoveBy(1);
cur_col = 0;
while (cur_col < col && *cur_cptr != NL && *cur_cptr != SNL &&
!BIsEnd()) {
old_col = cur_col;
BMoveBy(1);
}
if (cur_col != 0 && cur_col - col > col - old_col) BMoveBy(-1);
}
/* ------------------------------------------------------------ */
/* Put cursor in specific column, no rounding. */
void
BMakeColF(int col)
{
if (BSearchB(NL, SNL)) BMoveBy(1);
cur_col = 0;
while (cur_col < col && *cur_cptr != NL && *cur_cptr != SNL &&
!BIsEnd()) {
BMoveBy(1);
}
}
/* ------------------------------------------------------------ */
/* Return the mark's buffer. */
struct buffer *
BMarkBuf(struct mark *mptr)
{
return(mptr->bptr);
}
/* ------------------------------------------------------------ */
/* Create a mark at the point. */
struct mark *
BMarkCreate(void)
{
struct mark *mptr;
for (mptr = marks; mptr < &marks[MAXMARK] && mptr->pptr != NULL;
mptr++) ;
if (mptr >= &marks[MAXMARK - 1]) {
DError(RES_NOMARKS);
mptr = &marks[MAXMARK - 1];
}
mptr->bptr = cbuf;
mptr->pptr = cur_page;
mptr->mark_offset = cur_pt_offset;
return(mptr);