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eeng.c
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eeng.c
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/*
edx (EDitor for X), (C) 2003, Terry Loveall
released into the public domain.
Based upon the original work ee.c of Yijun Ding, copyright 1991 which is
in the public domain.
This program comes with no warranties or binaries. Use at your own risk.
*/
#define VOID_LINK (unsigned int)-1
#ifdef GREEK
/* Greek letters */
static char *greek_letter[26] = {
"alpha", "!beta", "Chi", "Delta", "!epsilon", "!Phi",
"Gamma", "eta", "iota", "Psi", "kappa", "Lambda", "mu", "nu",
"omega", "Pi", "!Theta", "!rho", "!Sigma", "tau", "Upsilon", NULL,
"Omega", "Xi", "Psi", "zeta"
};
int var_greek = 0; /* variant of Greek letters */
#endif
int x=0, screen_width; /* screen position 1 <= x <= screen_width */
int y=1, screen_height; /* screen size 0 <= y <= screen_height */
int eolx; /* coord of eol */
int update_scr = 1; /* do screen updates flag */
int first_time = 1; /* first time flag for stdin use */
char *bstart, *bend; /* marked block start, end and char pointer */
char *binding[26];
#define YTOP 0 /* first line */
char bbuf[NLEN]; /* temp file name */
char sbuf[NLEN], rbuf[NLEN]; /* search buffer, replace buffer */
char *s; /* pointer to search string */
int rlen, slen; /* replace and search lengths */
unsigned blen; /* length of text in block buffer */
char *cur_pos;
char *line_start; /* current pos, start of current line */
char *screen_start; /* global screen start */
unsigned int xlo; /* x offset for left display edge */
char *last_pos; /* last last position visited */
char *old_pos; /* last position visited */
int x_offset; /* offset of xtru from line_start */
int xtru = 0, ytru = 0; /* file position */
int ytot = 0; /* 0 <= ytru <= ytot */
int y01, y2; /* 1st, 2nd line of window */
int tabsize=8; /* tab size */
int doCtrlC = 0; /* decode next char from ^C function */
int doCtrlK = 0; /* decode next char from ^K function */
int doCtrlQ = 0; /* decode next char from ^Q function */
int doCtrlX = 0; /* decode next char from ^X function */
int doEscap = 0; /* decode next char from Esc function */
int help_done = 0;
int literal = 0;
int col; /* width of dialog preset (if any) */
int diastart; /* start of dialog input field */
int first; /* first dialog char flag, 0=true */
int dblen; /* current dialog buffer size */
char *diabuf; /* dialog buffer pointer */
void (*dialogCB) (); /* callback pointer */
static char lbuf[16]; /* goto line number buffer */
static char cbuf[16]; /* goto column number buffer */
static char wbuf[8]="78"; /* reformat block right margin */
static char twbuf[8]="4"; /* tab width buffer */
static char mbuf[NLEN]; /* macro record buffer */
static char *pmbuf=mbuf; /* record pointer for macro buffer */
struct stat ofstat; /* edit file stat structure */
FILE *fi, *fb; /* file handles for input, block */
static int fo; /* file handle for output */
static char fbuf[NLEN]; /* current file name buffer */
#ifndef TERMINAL
static char newbuf[NLEN]; /* new file name buffer */
#endif /* TERMINAL */
char flag[WIN+1]="\0\0\0C\0\0N\0\0"; /* options flag presets */
char fsym[]="MFOCTBNRAW"; /* Modified,Fill,Overwrite,Case,Tab,Block marked,autoiNdent,Rec,All,Word */
/* word delimiter chars */
char wdelims[] = "\t ,;+*=^&|?:`()[]{}<>\"\'";
char mdelims[] = "\t ,;+-*=^&|?`()[]{}<>\"\'";
char sdelims[] = "\t >]})";
char s1delims[] = "\t ";
/* current window struct */
typedef struct {
char name[NLEN];
int jump;
} MWIN; /* my window structure */
MWIN ewin; /* current window */
char *file_end; /* end of file */
char *mk; /* mark */
char *last_mk = NULL; /* prev mk position */
#ifdef STATICBUF
/* static buffer allocation scheme */
char bb[BMAX]; /* block buffer */
char edbuf[AMAX]; /* edit buffer */
char unbuf[AMAX]; /* undo stack */
/* undo record struct */
typedef struct {
void *link;
char *pos;
int length;
char str[1];
} U_REC;
#else
/* dynamic buffer allocation scheme */
#define UMAX 0x2000 /* undo level */
unsigned int amax, bmax, umax; /* main buffer, block size, undo level */
char *bb; /* block buffer */
char *edbuf; /* edit buffer */
void *unbuf; /* undo stack */
/* undo record struct */
typedef struct {
unsigned int link;
int pos;
int length;
char str[0];
} U_REC;
#endif /* STATICBUF */
int undo_wrap = 0; /* undo buffer wrap flag */
U_REC* undop; /* active undo/redo pointer */
U_REC* undosp; /* top of undo stack pointer */
int in_undo; /* dont reset undop to undosp if true */
int undone=1; /* have undone all */
/* function prototypes */
int get_tru(char* pos);
char* get_cur();
void init_undo();
U_REC* new_undo(char *pos, int len);
void u_del(char *pos, int len);
void u_ins(char *pos, int len);
void ytot_ins();
void undo();
void redo();
void sys_exit(int code);
void bell();
void move_to(int newx, int newy);
void getx();
void cursor_up(), cursor_down(), cursor_left(), cursor_right();
void cursor_pageup();
void cursor_pagedown();
void word_left();
void word_right();
void word_mark();
void word_marknopen();
void drstr(char* disp, int i);
void show_rest(int len, char *s);
void show_scr(int fr, int to);
void scroll_up();
void scroll_down();
void show_sdn(int line);
void show_flag(int x, int g);
void dialog(int key);
void show_note(char *prp);
int show_gets(char *prp, char *buf, int blen, void *cb);
void options(int key);
void show_pos();
void show_top(), show_help(), show_mode();
void top();
char *file_new();
void file_read();
char *file_ltab(char *s);
int file_write(int fd, char *s, char *e);
int file_fout();
void do_save();
#ifndef TERMINAL
void set_title();
int SYSTEM (char *cmd);
void gorun();
void new_edit(char *path, char *fn);
void newedit(char *fn);
void mterm();
#endif /* TERMINAL */
void do_cd();
void chgdir();
void do_open();
void file_save(int f_all, int f_win);
void newfile();
void file_resize(char *s, char *d);
void goto_x(int xx), goto_y(int yy);
void goto_ptr(char *s);
void goline();
void goto_last();
void goto_line(), goto_col();
void gocol();
void goto_col();
void twist_pos();
int str_cmp(char *s);
void gofind();
char *goto_find(char *s, int back);
void get_mk(char* dbuf);
char *goto_search(int back);
void dorepl();
void doSAR();
void goto_replace(int all);
void gettab();
void tab_size();
void getmarg();
void window_size();
void mark_off();
void block_put(), block_get(), block_mark();
void remove_block();
void block_remove_update();
void chg_case(int upper);
void transpose();
void block_copy(int delete);
void block_paste(), block_write(), block_line();
void doblockr();
void doblockw();
void block_read();
int block_fill();
void find_match();
void block_format();
void key_return(), key_deleol(char *s), key_delete();
void key_backspace(), key_delword(int eol);
void key_tab(int tabi);
void key_normal(int key);
void key_macros(int record);
#ifdef GREEK
void l(int key);
#endif
void ctrlc_key(int key);
void ctrlk_key(int key);
void ctrlq_key(int key);
void key_control(int key);
#ifdef TERMINAL
void main_meta(int key);
#else
void key_alt(int key);
void key_escape(int key);
void key_func(int key);
#endif /* TERMINAL */
void scr_update();
void main_exec(int key);
/* code */
/*
void prrec(U_REC* undp, char indicator)
{
char str[NLEN];
if(undp == NULL) return;
memset(str,0,NLEN);
memcpy(str, undp->str, undp->length >= 0 ? undp->length: 0 - undp->length);
printf("%c:p=%x, l=%x, pos=%x, ln=%x, str=%s.\n",
indicator,
(unsigned int)undp,
(unsigned int)undp->link + unbuf,
(unsigned int)(undp->pos + edbuf),
undp->length,
str);
}
*/
/* get true x co-ord for char at 'pos' */
int get_tru(char* pos)
{
char* tmpp;
int i = 1;
tmpp = line_start + strlen(line_start+1)+1;
if(line_start > pos || tmpp < pos) {
#ifdef DEBUG
printf("Pos=%x, ls=%x, le=%x.\n",
(unsigned int)pos,
(unsigned int)line_start,
(unsigned int)tmpp);
#else
printf("get_tru\n");
bell();
#endif /* DEBUG */
return 0;
}
for(tmpp = line_start+1; tmpp < pos; tmpp++){
if(*tmpp != '\t') {i++;}
else {
i = i + ((tabsize) - ((i-1)%tabsize));
}
}
return(i);
}
char* get_cur()
{
return(line_start+x_offset);
}
#ifdef STATICBUF
void init_undo()
{
undosp = undop = (void*)&unbuf;
undop->link = NULL;
undop->pos = cur_pos - 1;
undop->length = 0;
}
static char ub[2] = "";
U_REC* new_undo(char *pos, int len)
{
U_REC *tmp;
int tlen = abs(undosp->length);
/* wrap undo pointer if no space for requested len in undo buffer */
tmp = (char*) &undosp->str[tlen] + sizeof(U_REC) + len < (char*) &unbuf + AMAX
? (char*)&undosp->str[tlen]
: (void*)&unbuf;
tmp->link = undosp;
tmp->pos = pos;
tmp->length = 0;
if(flag[CHG] && ((char*)tmp->link >
(char*)&unbuf + (AMAX - (AMAX / 10)))){
bell();
show_gets("Undo buffer 90\% full! ", (char*)ub, 1, show_pos);
}
return tmp;
}
void u_del(char *pos, int len)
{
if(!undosp) init_undo();
if(!undosp->length) undosp->pos = pos;
/* get new_undo if top rec is u_ins, or different pos or no space */
else if((undosp->length > 0) ||
( (void*)&undosp->pos[0 - undosp->length] != pos ) || /* stack only del not bs */
( (char*)&undosp->str[0 - undosp->length] + len >= (char*)unbuf + AMAX )) {
undosp = new_undo(pos, abs(len));
if(undosp == (void*)&unbuf) undo_wrap--; /* say undo wrapped */
}
if(len) memcpy(&undosp->str[abs(undosp->length)], pos, len);
undosp->length = undosp->length - len;
if(!in_undo) { undop = undosp; undone = 0;}
}
void u_ins(char *pos, int len)
{
int tlen;
if(!undosp) init_undo();
if(!undosp->length) undosp->pos = pos;
/* get new_undo if top rec is u_del, or different pos or no space */
else if((undosp->length < 0) ||
/* stack only left to right insertions */
( (void*)&undosp->pos[undosp->length] != pos ) ||
( (char*)&undosp->str[undosp->length] + len >= (char*)unbuf + AMAX )) {
undosp = new_undo(pos, abs(len));
if(undosp == (void*)&unbuf) undo_wrap--; /* say undo wrapped */
}
tlen = abs(undosp->length);
if(len) memcpy(&undosp->str[tlen], pos, len);
undosp->length = tlen + len;
if(!in_undo) { undop = undosp; undone = 0;}
}
void ytot_ins()
{
char* e;
for(e=undop->pos; e<undop->pos + abs(undop->length); e++)
if(*e == EOL) ytot++;
}
void undo()
{
/* dont undo nothing, but say nothing is unchanged */
if(undone) { bell(); return; }
if(undop != undosp) undop = undop->link;
in_undo++;
goto_ptr(undop->pos);
if(undop->length < 0) { /* is delete so insert */
/* delete flag is negative length */
file_resize(undop->pos, undop->pos - undop->length);
memcpy(undop->pos, &undop->str[0], 0 - undop->length);
u_ins(undop->pos, 0 - undop->length);
ytot_ins(); /* adjust ytot when inserting */
}
else { /* is insert so delete */
file_resize(undop->pos + undop->length, undop->pos);
}
goto_ptr(undop->pos);
if(!undop->link) {
undone = -1;
flag[CHG] = 0;
show_top();
}
in_undo--;
flag[SHW] = 1;
}
void redo()
{
/* dont redo nothing */
if(undop == undosp) { bell(); return; }
in_undo++;
goto_ptr(undop->pos);
if(undop->length > 0) { /* is insert so insert */
file_resize(undop->pos, undop->pos + undop->length);
memcpy(undop->pos, &undop->str[0], undop->length);
u_ins(undop->pos, undop->length);
ytot_ins(); /* adjust ytot when inserting */
}
else { /* is delete so delete */
file_resize(undop->pos - undop->length, undop->pos);
}
goto_ptr(undop->pos);
undop = (void*)&undop->str[abs(undosp->length)];
undone = 0;
in_undo--;
flag[SHW] = 1;
}
#else /* STATICBUF */
char * realloc_buffer(int mode)
{
char *ptr;
int i;
switch(mode) {
case 0: {
i = amax+AMAX+tabsize+1;
if (i<0) return NULL;
ptr = realloc(edbuf, (size_t)i);
if (ptr) {
amax += AMAX;
i = ptr - edbuf;
edbuf += i;
file_end += i;
cur_pos += i;
line_start += i;
last_pos += i;
old_pos += i;
screen_start += i;
mk += i;
bstart += i;
bend += i;
if (last_mk) last_mk += i;
}
return ptr;
}
case 1: {
i = bmax+BMAX+tabsize+1;
if (i<0) return NULL;
ptr = realloc(bb, (size_t)i);
if (ptr) {
bmax += BMAX;
bb = ptr;
}
return ptr;
}
case 2: {
i = umax+UMAX+1;
if (i<0) return NULL;
ptr = realloc(unbuf, (size_t)i);
if (ptr) {
umax += UMAX;
i = (intptr_t)ptr - (intptr_t)unbuf;
unbuf = ptr;
undop = (void*)undop+i;
undosp = (void*)undosp+i;
}
return ptr;
}
}
return NULL;
}
void init_undo()
{
undosp = undop = unbuf;
undop->link = VOID_LINK;
undop->pos = cur_pos - edbuf -1;
undop->length = 0;
}
U_REC* new_undo(char *pos, int len)
{
U_REC *tmp;
int tlen = abs(undosp->length);
retry:
/* wrap undo pointer if no space for requested len in undo buffer */
if ((void *)undosp->str + tlen + sizeof(U_REC) + len < unbuf + umax) {
tmp = (void *)undosp->str + tlen;
} else {
if (realloc_buffer(2)) goto retry;
tmp = (void *)unbuf;
}
tmp->link = (uintptr_t)undosp - (uintptr_t)unbuf;
tmp->pos = pos - edbuf;
tmp->length = 0;
return tmp;
}
void u_del(char *pos, int len)
{
if(!undosp) init_undo();
if(!undosp->length) undosp->pos = pos - edbuf;
/* get new_undo if top rec is u_ins, or different pos or no space */
if((undosp->length > 0) ||
( undosp->pos + edbuf - undosp->length != pos) || /* stack only del not bs */
( (void*)undosp->str - undosp->length + abs(len) >= unbuf + umax )) {
undosp = new_undo(pos, abs(len));
if(undosp == unbuf) undo_wrap--; /* say undo wrapped */
}
if(len) memcpy(undosp->str + abs(undosp->length), pos, len);
undosp->length = undosp->length - len;
if(!in_undo) { undop = undosp; undone = 0;}
}
void u_ins(char *pos, int len)
{
int tlen;
if(!undosp) init_undo();
if(!undosp->length) undosp->pos = pos - edbuf;
/* get new_undo if top rec is u_del, or different pos or no space */
if((undosp->length < 0) ||
/* stack only left to right insertions */
( undosp->pos + edbuf + undosp->length != pos ) ||
( (void *)undosp->str + undosp->length + abs(len) >= unbuf + umax )) {
undosp = new_undo(pos, abs(len));
if(undosp == unbuf) undo_wrap--; /* say undo wrapped */
}
tlen = abs(undosp->length);
if(len) memcpy(undosp->str + tlen, pos, len);
undosp->length = tlen + len;
if(!in_undo) { undop = undosp; undone = 0;}
}
void ytot_ins()
{
char* e;
for(e=undop->pos+edbuf; e<undop->pos+edbuf + abs(undop->length); e++)
if(*e == EOL) ytot++;
}
void undo()
{
/* dont undo nothing, but say nothing is unchanged */
if(undone) { bell(); return; }
if(undop != undosp) {
if (undop->link == VOID_LINK)
undop = unbuf;
else
undop = undop->link + unbuf;
}
in_undo++;
goto_ptr(undop->pos + edbuf);
if(undop->length < 0) { /* is delete so insert */
/* delete flag is negative length */
file_resize(undop->pos + edbuf, undop->pos + edbuf - undop->length);
memcpy(undop->pos + edbuf, undop->str, - undop->length);
u_ins(undop->pos + edbuf, - undop->length);
ytot_ins(); /* adjust ytot when inserting */
}
else { /* is insert so delete */
file_resize(undop->pos + edbuf + undop->length, undop->pos + edbuf);
}
goto_ptr(undop->pos + edbuf);
if(undop->link==VOID_LINK) {
undone = -1;
flag[CHG] = 0;
show_top();
}
in_undo--;
flag[SHW] = 1;
}
void redo()
{
/* dont redo nothing */
if(undop == undosp) { bell(); return; }
in_undo++;
goto_ptr(undop->pos + edbuf);
if(undop->length > 0) { /* is insert so insert */
file_resize(undop->pos + edbuf, undop->pos + edbuf + undop->length);
memcpy(undop->pos + edbuf, undop->str, undop->length);
u_ins(undop->pos + edbuf, undop->length);
ytot_ins(); /* adjust ytot when inserting */
}
else { /* is delete< so delete */
file_resize(undop->pos + edbuf - undop->length, undop->pos + edbuf);
}
goto_ptr(undop->pos + edbuf);
undop = (void*)undop->str + abs(undosp->length);
undone = 0;
in_undo--;
flag[SHW] = 1;
}
#endif /* STATICBUF */
#ifdef TERMINAL
void sys_exit(int code)
{
if(!(flag[CHG])) {
/* watch where you're goin', clean up where you been */
if(cfdpath) free(cfdpath);
gotoxy(0,phys_height+2);
ttclose();
exitf = 0;
} else putch(7);
}
void bell()
{
putch(7);
}
#else
char a[2] = "";
void do_exit(int code)
{
if((a[0] & ~0x20) == 'S') {do_save(); sys_exit(0);}
if((a[0] & ~0x20) == 'X') {flag[CHG] = 0; sys_exit(0);}
}
void sys_exit(int code)
{
// if file modified then do 'Save-as:', optionally save-and-exit.
if(flag[CHG]) {
bell();
show_gets("Changed: Save, eXit or Cont.?", a, sizeof(a), &do_exit);
return;
}
if(!(flag[CHG])) {
/* watch where you're goin', clean up where you been */
if(selection_text) free(selection_text);
if(cfdpath) free(cfdpath);
exit(code);
}
bell();
}
#endif /* TERMINAL */
void goto_xpos()
{
goto_x(x_offset < strlen(line_start+1)+1 ?
x_offset :
strlen(line_start+1)+1);
}
/* cursor movement */
void cursor_up()
{
if(flag[BLK]) flag[SHW] = 1;
if(ytru == 0) return;
ytru--;
while(*--line_start != EOL) ;
y--;
goto_xpos();
}
void cursor_down()
{
if(flag[BLK]) flag[SHW] = 1;
if(ytru == ytot) return;
ytru++;
while(*++line_start != EOL) ;
y++;
goto_xpos();
}
void move_to(int newx, int newy)
{
int old;
if ((newy < 0) || (file_end==edbuf+1)) return;
if((y == newy && x == newx) || (executive != MAIN)) return;
while((y < newy) && (ytru < ytot)) cursor_down();
while((y > newy) && (ytru > 0)) cursor_up();
if((line_start[x_offset] == EOL) && (x_offset != 1)) cursor_left();
/* detect impossible to achieve x pos within tabs */
old = xtru - newx;
while((old > 0 ? xtru > newx : xtru < newx) && (*cur_pos != EOL)){
xtru < newx ? cursor_right() : cursor_left();
}
}
void getx()
{
xtru = get_tru(cur_pos);
x_offset = cur_pos - line_start;
x = xtru - xlo;
}
/* cursor left & right */
void cursor_left()
{
if(xtru == 1){ cursor_up(); goto_x(strlen(line_start+1)+1); return;};
if(flag[BLK]) flag[SHW] = 1;
if( x == 1 && xlo != 0){
xlo -= XINC;
flag[SHW] = 1;
}
--cur_pos;
getx();
}
void cursor_right()
{
if(*cur_pos == EOL) {goto_x(1); cursor_down(); return;};
if(flag[BLK]) flag[SHW] = 1;
if(x == screen_width-1) {
xlo += XINC;
flag[SHW] = 1;
}
++cur_pos;
getx();
}
void cursor_pageup()
{
int i,ytmp=y;
for(i=1; i<screen_height; ++i) cursor_up();
if(ytru < screen_height) ytmp = 0;
y = ytmp;
flag[SHW] = 1;
}
void cursor_pagedown()
{
int i,ytmp=y;
for(i=1; i<screen_height; ++i) cursor_down();
y = ytmp;
flag[SHW] = 1;
}
void word_left()
{
char *d = cur_pos;
if(d[-1] == EOL) { /* at bol */
if(ytru == 0) return; /* don't backup past start */
cursor_up();
goto_x(strlen(line_start+1)+1); /* goto end of line */
return;
}
/* skip white space separators */
while(strchr(wdelims,d[-1])) { d--; cursor_left(); }
/* skip real chars */
while(!strchr(wdelims,d[-1])) { d--; cursor_left(); }
}
void word_right()
{
char *d = cur_pos;
if(*d == EOL) { /* at eol */
if(ytru >= ytot) return; /* don't go past end */
cursor_down();
goto_x(1); /* goto start of line */
return;
}
/* skip real chars */
while(!strchr(wdelims,*d)) { d++; cursor_right(); }
/* skip white space seperators */
while(strchr(wdelims,*d)) { d++; cursor_right(); }
}
void word_mark()
{
if(cur_pos[0] <= BLNK) return; /* don't mark nothing */
mark_off();
if(!strchr(wdelims,cur_pos[-1])) word_left();
block_mark();
while(!strchr(wdelims,*cur_pos)) cursor_right();
#ifndef TERMINAL
keve->state |= ShiftMask;
#endif /* TERMINAL */
}
// mark word under cursor and open in new window if a valid filename
void word_marknopen()
{
char sbuf[NLEN];
char *s = sbuf;
struct stat o_stat;
get_mk(sbuf); // get just the filename
#ifndef TERMINAL
s += strlen(sbuf);
if(!stat(sbuf,&o_stat) && S_ISREG(o_stat.st_mode)){
// pick up possible grep ':nnn:' string for implicit edx goto line
while(!strchr(mdelims,*cur_pos)){ *s++ = *cur_pos; cursor_right();}
*s = 0;
new_edit(cfdpath, sbuf);
}
#endif /* TERMINAL */
}
/* display --------------------------------------------------------*/
/* assuming cursor in correct position: show_rest(screen_width-x,line_start+x_offset) */
void drstr(char* disp, int i)
{
#ifdef TERMINAL
disp[i] = 0;
cputs(disp);
#else
drawstring(disp,i);
#endif /* TERMINAL */
outxy.X += i;
}
void show_rest(int len, char *s)
{
char *ss;
char disp[MAXVLINE];
int i,j,k=0,xlt=xlo;
ss = s;
i = 0;
if(flag[BLK]) {
if(cur_pos < mk)
{ bstart = cur_pos; bend = mk; }
else
{ bstart = mk; bend = cur_pos; }
if ((ss >= bstart) && (ss < bend)) highvideo();
}
while(*ss != EOL && i < MAXVLINE) {
if(flag[BLK]) {
if (ss == bstart) { drstr(disp+xlo,i-xlo); k += i; xlo=i=0; highvideo(); }
if (ss == bend) { drstr(disp+xlo,i-xlo); k += i; xlo=i=0; lowvideo(); }
}
if(*ss == '\t') {
for(j = i +(tabsize - (k+i)%tabsize); i<j; disp[i++] = ' ');
ss++;
}
#ifdef TERMINAL
else if(*ss == '\r') {disp[i++] = '.';ss++;}
#endif /* TERMINAL */
else disp[i++] = *ss++;
}
if(i) drstr(disp+xlo,i-xlo);
if(flag[BLK] && (ss == bend)) lowvideo();
clreol();
xlo = xlt;
}
/* line_start and y correct */
void show_scr(int fr, int to)
{
int len=screen_width-1;
int i=fr;
screen_start=line_start;
/* calculate screen_start */
for(; i<y; i++) while(screen_start > edbuf && *--screen_start != EOL) ;
for(; i>y; i--) while(*++screen_start != EOL) ;
/* first line */
screen_start++;
do {
gotoxy(0,fr+y2);
if(screen_start<file_end && strlen(screen_start) > xlo)
show_rest(len, screen_start);
else {
if(((flag[BLK]) &&
(screen_start == bend)) ||
(screen_start == bend+1)) lowvideo();
clreol();
}
/* skip EOL */
while(*screen_start++) ;
} while(++fr <= to);
}
void scroll_up()
{
if(!y) cursor_down();
y--;
flag[SHW] = 1;
}
void scroll_down()
{
if(line_start <= edbuf) return;
if(ytru <= y) return;
if(y >= screen_height-1) cursor_up();
y++;
flag[SHW] = 1;
}
void show_sdn(int line)
{
gotoxy(0,y2+line);
show_scr(0, screen_height-1);
}
void show_flag(int x, int g)
{
gotoxy(20+x-1,y01);
putch(g? fsym[x]: '.');
flag[x] = g;
}
/*
simple minded line input executive for status line dialogs.
Successful completion, indicated by a Return key, executes the
callback in dialogCB. Responds to 'Esc' and ^C by terminating
without executing the callback. Printing first char resets Col.
Use ^H to overwrite preset string, 'End' displays cursor to EOS.
All other characters input to diabuf. Set by 'show_gets'.
*/
void dialog(int key)
{
int skey;
skey = key & 0xff;
gotoxy(diastart+col,y01);
#ifdef TERMINAL
if(key == 0x0c) { /* ^L */
#else
undraw_cursor();
if(keve->state & ControlMask) skey &= 0x1f;
if(key == XK_End) {
#endif /* TERMINAL */
while((diabuf[col] != 0) && (col < dblen)) putch(diabuf[col++]);
} else {
switch(skey){
case 8: {
if(col < 0) col = strlen(diabuf);
#ifdef TERMINAL
if(col) { col--; gotoxy(--outxy.X,outxy.Y); putch(' '); gotoxy(outxy.X,outxy.Y);}
#else
if(col) { col--; outxy.X--; putch(' '); outxy.X--;}
#endif /* TERMINAL */
break;
}
case 3:
case 13:
case 27: {
executive = MAIN;
diabuf[col] = 0;
if(skey == 13) dialogCB(0);
flag[SHW] = 1;
scr_update();
show_top();
break;
}
default: {
if(col < 0 || !first) {
col = 0;
gotoxy(diastart+col,y01);
clreol();
}
if(col < dblen){
diabuf[col++] = key;
putch(key);
} else bell();
}
}
}
first = key;
#ifndef TERMINAL
draw_cursor();
show_vbar();