WebSVN – SvarDOS – Diff – /sved/trunk/sved.c


/* Sved, the SvarDOS editor
 *
 * Copyright (C) 2023 Mateusz Viste
 *
 * Sved is released under the terms of the MIT license.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
 
#include <dos.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>   /* _fcalloc() */
 
#include "mdr\cout.h"
#include "mdr\dos.h"
#include "mdr\keyb.h"
 
#include "svarlang\svarlang.h"
 
#define COL_TXT        0
#define COL_STATUSBAR1 1
#define COL_STATUSBAR2 2
#define COL_SCROLLBAR  3
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};
 
#define SCROLL_CURSOR 0xB1
 
 
struct line {
  struct line far *prev;
  struct line far *next;
  unsigned short len;
  char payload[1];
};
 
struct linedb {
 
  struct line far *cursor;
  unsigned short xoffset;
};
 
 
/* returns non-zero on error */
static int line_add(struct linedb *db, const char far *line) {
  unsigned short slen;
  struct line far *l;
 
  /* slen = strlen(line) (but for far pointer) */
  for (slen = 0; line[slen] != 0; slen++);
 
  /* trim out CR/LF line endings */
  if ((slen >= 2) && (line[slen - 2] == '\r')) {
    slen -= 2;
  } else if ((slen >= 1) && (line[slen - 1] == '\n')) {
    slen--;
  }
 
  l = _fcalloc(1, sizeof(struct line) + slen + 1);
  if (l == NULL) return(-1);
 
  l->prev = db->cursor;
  if (db->cursor) {
    l->next = db->cursor->next;
    db->cursor->next = l;
    l->next->prev = l;
  }
  db->cursor = l;
  _fmemcpy(l->payload, line, slen);
  l->len = slen;
 
  return(0);
}
 
 
static void db_rewind(struct linedb *db) {
  if (db->cursor == NULL) return;
  while (db->cursor->prev) db->cursor = db->cursor->prev;
 
}
 
 
static void load_colorscheme(void) {
  scheme[COL_TXT] = 0x17;
  scheme[COL_STATUSBAR1] = 0x70;
  scheme[COL_STATUSBAR2] = 0x78;
  scheme[COL_SCROLLBAR] = 0x70;
}
 
 
static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {
  unsigned char i;
  const char *s = svarlang_strid(0); /* HELP */
  unsigned char helpcol = screenw - (strlen(s) + 4);
 
  /* clear screen */
  mdr_cout_cls(scheme[COL_TXT]);
 
  /* status bar */
  for (i = 0; i < helpcol; i++) {
    mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);
    if (*fname != 0) fname++;
  }
  mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);
  mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);
 
  /* scroll bar */
  for (i = 0; i < (screenh - 1); i++) {
    mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
  }
}
 
 
static void ui_help(unsigned char screenw) {
#define MAXLINLEN 35
  unsigned short i, x, offset;
  offset = (screenw - MAXLINLEN + 1) >> 1;
  mdr_cout_cursor_hide();
  for (i = 2; i <= 12; i++) {
    for (x = offset - 2; x < offset + MAXLINLEN; x++) mdr_cout_char(i, x, ' ', scheme[COL_STATUSBAR1]);
  }
 
  mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);
  for (i = 0; i <= 2; i++) {
    mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);
  }
  mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);
  mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);
 
  keyb_getkey();
  mdr_cout_cursor_show();
#undef MAXLINLEN
}
 
 
static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto, unsigned char y) {
 
  unsigned char len;
  const struct line far *l;
 
#ifdef DBG_REFRESH
  static char m = 'a';
  m++;
  if (m > 'z') m = 'a';
#endif
 
  /* rewind cursor line to first line that needs redrawing */
  for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;
 
  /* iterate over lines and redraw whatever needs to be redrawn */
  for (; l != NULL; l = l->next, y++) {
 
    /* skip lines that do not need to be refreshed */
    if (y < uidirtyfrom) continue;
    if (y > uidirtyto) break;
 
    if (db->xoffset < l->len) {
      for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);
    } else {
      len = 0;
    }
    while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);
 
#ifdef DBG_REFRESH
    mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
#endif
 
    if (y == screenh - 2) break;
  }
 
}
 
 
static void check_cursor_not_after_eol(struct linedb *db, unsigned char *cursorpos, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->xoffset + *cursorpos <= db->cursor->len) return;
 
  if (db->cursor->len < db->xoffset) {
    *cursorpos = 0;
    db->xoffset = db->cursor->len;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  } else {
    *cursorpos = db->cursor->len - db->xoffset;
  }
}
 
 
static void cursor_up(struct linedb *db, unsigned char *cursorposy, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->prev != NULL) {
    db->cursor = db->cursor->prev;
    if (*cursorposy == 0) {
 
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    } else {
      *cursorposy -= 1;
    }
  }
}
 
 
static void cursor_eol(struct linedb *db, unsigned char *cursorposx, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  /* adjust xoffset to make sure eol is visible on screen */
  if (db->xoffset > db->cursor->len) {
    db->xoffset = db->cursor->len - 1;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
    db->xoffset = db->cursor->len - screenw + 2;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
  *cursorposx = db->cursor->len - db->xoffset;
}
 
 
static void cursor_down(struct linedb *db, unsigned char *cursorposy, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->next != NULL) {
    db->cursor = db->cursor->next;
    if (*cursorposy < screenh - 2) {
      *cursorposy += 1;
    } else {
 
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    }
  }
}
 
 
static void cursor_left(struct linedb *db, unsigned char *cursorposx, unsigned char *cursorposy, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (*cursorposx > 0) {
    *cursorposx -= 1;
  } else if (db->xoffset > 0) {
    db->xoffset -= 1;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
    cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);
    cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);
  }
}
 
 
static void cursor_home(struct linedb *db, unsigned char *cursorposx, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  *cursorposx = 0;
  if (db->xoffset != 0) {
    db->xoffset = 0;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
}
 
 
static void cursor_right(struct linedb *db, unsigned char *cursorposx, unsigned char *cursorposy, unsigned char screenw, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->len > db->xoffset + *cursorposx) {
    if (*cursorposx < screenw - 2) {
      *cursorposx += 1;
    } else {
      db->xoffset += 1;
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    }
  } else {
    cursor_down(db, cursorposy, screenh, uidirtyfrom, uidirtyto);
    cursor_home(db, cursorposx, uidirtyfrom, uidirtyto);
  }
}
 
 
static void del(struct linedb *db, unsigned char cursorposx, unsigned char cursorposy, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (cursorposx + db->xoffset < db->cursor->len) {
    _fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
    *uidirtyfrom = cursorposy;
    *uidirtyto = cursorposy;
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
    struct line far *nextline = db->cursor->next;
    if (db->cursor->next->len > 0) {
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
      if (newptr != NULL) {
        db->cursor = newptr;
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
        db->cursor->len += db->cursor->next->len;
 
 
      }
    }
    db->cursor->next = db->cursor->next->next;
    db->cursor->next->prev = db->cursor;
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
    _ffree(nextline);
    *uidirtyfrom = cursorposy;
    *uidirtyto = 0xff;
  }
}
 
 
static void bkspc(struct linedb *db, unsigned char *cursorposx, unsigned char *cursorposy, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
  if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
 
  cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);
  del(db, *cursorposx, *cursorposy, uidirtyfrom, uidirtyto);
}
 
 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
 * of argc and argv, saves some 330 bytes of binary size */
static char *parseargv(void) {
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
  unsigned char count = 0;
  char *argv[4];
 
  while (count < 4) {
    /* jump to nearest arg */
    while (*tail == ' ') {
      *tail = 0;
      tail++;
    }
 
    if (*tail == '\r') {
      *tail = 0;
      break;
    }
 
    argv[count++] = tail;
 
    /* jump to next delimiter */
    while ((*tail != ' ') && (*tail != '\r')) tail++;
  }
 
  /* check args now */
  if (count != 1) return(NULL);
 
  return(argv[0]);
}
 
 
static int loadfile(struct linedb *db, const char *fname) {
  char buff[1024];
  unsigned int prevlen = 0, len, llen;
  int fd;
  int r = 0;
 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
    mdr_coutraw_puts("Failed to open file:");
    mdr_coutraw_puts(fname);
    return(-1);
  }
 
  do {
    if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {
      len += prevlen;
    } else {
      len = prevlen;
    }
 
    /* look for nearest \n and replace with 0*/
    for (llen = 0; buff[llen] != '\n'; llen++) {
      if (llen == sizeof(buff)) break;
    }
    buff[llen] = 0;
    if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */
    if (line_add(db, buff) != 0) {
      mdr_coutraw_puts("out of memory");
      r = -1;
      break;
    }
 
    len -= llen + 1;
    memmove(buff, buff + llen + 1, len);
    prevlen = len;
  } while (len > 0);
 
  _dos_close(fd);
 
  return(r);
}
 
 
int main(void) {
  const char *fname;
  struct linedb db;
  unsigned char screenw = 0, screenh = 0;
  unsigned char cursorposx = 0, cursorposy = 0;
  unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */
 
  bzero(&db, sizeof(db));
 
  {
    char nlspath[128], lang[8];
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
  }
 
  fname = parseargv();
 
  if (fname == NULL) {
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
    return(0);
  }
 
  /* load file */
  if (loadfile(&db, fname) != 0) return(1);
 
  /* add an empty line at end if not present already */
  if (db.cursor->len != 0) line_add(&db, "");
 
  if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
  ui_basic(screenw, screenh, fname);
 
  db_rewind(&db);
 
  for (;;) {
    int k;
 
    check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
    mdr_cout_locate(cursorposy, cursorposx);
 
    if (uidirtyfrom != 0xff) {
      ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto, cursorposy);
      uidirtyfrom = 0xff;
    }
 
    k = keyb_getkey();
 
    if (k == 0x150) { /* down */
      cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x148) { /* up */
      cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14D) { /* right */
      cursor_right(&db, &cursorposx, &cursorposy, screenw, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14B) { /* left */
      cursor_left(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x149) { /* pgup */
      // TODO
 
    } else if (k == 0x151) { /* pgdown */
      // TODO
 
    } else if (k == 0x147) { /* home */
       cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14F) { /* end */
       cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x1B) { /* ESC */
      break;
 
    } else if (k == 0x0D) { /* ENTER */
      /* add a new line */
      if (line_add(&db, db.cursor->payload + db.xoffset + cursorposx) == 0) {
        /* trim the line above */
        db.cursor->prev->len = db.xoffset + cursorposx;
        db.cursor->prev->payload[db.cursor->prev->len] = 0;
        /* move cursor to the (new) line below */
        cursorposx = 0;
        if (cursorposy < screenh - 2) {
          uidirtyfrom = cursorposy;
          cursorposy++;
        } else {
 
          uidirtyfrom = 0;
        }
        uidirtyto = 0xff;
      } else {
        /* ERROR: OUT OF MEMORY */
      }
 
    } else if (k == 0x153) {  /* DEL */
      del(&db, cursorposx, cursorposy, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x008) { /* BKSPC */
      bkspc(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
      struct line far *n;
      n = _frealloc(db.cursor, sizeof(struct line) + db.cursor->len);
      if (n != NULL) {
        unsigned short off = db.xoffset + cursorposx;
        if (n->prev) n->prev->next = n;
        if (n->next) n->next->prev = n;
 
        db.cursor = n;
        _fmemmove(db.cursor->payload + off + 1, db.cursor->payload + off, db.cursor->len - off + 1);
        db.cursor->len += 1;
        uidirtyfrom = cursorposy;
        uidirtyto = cursorposy;
        db.cursor->payload[off] = k;
        cursor_right(&db, &cursorposx, &cursorposy, screenw, screenh, &uidirtyfrom, &uidirtyto);
      }
 
    } else if (k == 0x13b) { /* F1 */
      ui_help(screenw);
      uidirtyfrom = 0;
      uidirtyto = 0xff;
 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
      char buff[4];
      const char *HEX = "0123456789ABCDEF";
      buff[0] = HEX[(k >> 8) & 15];
      buff[1] = HEX[(k >> 4) & 15];
      buff[2] = HEX[k & 15];
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);
      mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);
      keyb_getkey();
      break;
    }
  }
 
  mdr_cout_close();
 
  /* TODO free memory */
 
  return(0);
}
 

Rev 1309	Rev 1310
1	`/* Sved, the SvarDOS editor`	1	`/* Sved, the SvarDOS editor`
2	`*`	2	`*`
3	`* Copyright (C) 2023 Mateusz Viste`	3	`* Copyright (C) 2023 Mateusz Viste`
4	`*`	4	`*`
5	`* Sved is released under the terms of the MIT license.`	5	`* Sved is released under the terms of the MIT license.`
6	`*`	6	`*`
7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`	7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`
8	`* of this software and associated documentation files (the "Software"), to`	8	`* of this software and associated documentation files (the "Software"), to`
9	`* deal in the Software without restriction, including without limitation the`	9	`* deal in the Software without restriction, including without limitation the`
10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`	10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`
11	`* sell copies of the Software, and to permit persons to whom the Software is`	11	`* sell copies of the Software, and to permit persons to whom the Software is`
12	`* furnished to do so, subject to the following conditions:`	12	`* furnished to do so, subject to the following conditions:`
13	`*`	13	`*`
14	`* The above copyright notice and this permission notice shall be included in`	14	`* The above copyright notice and this permission notice shall be included in`
15	`* all copies or substantial portions of the Software.`	15	`* all copies or substantial portions of the Software.`
16	`*`	16	`*`
17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`	17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`	18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`	19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`
20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`	20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`
21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`	21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`
22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`	22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`
23	`* IN THE SOFTWARE.`	23	`* IN THE SOFTWARE.`
24	`*/`	24	`*/`
25		25
26	`#include <dos.h>`	26	`#include <dos.h>`
27	`#include <fcntl.h>`	27	`#include <fcntl.h>`
28	`#include <stdlib.h>`	28	`#include <stdlib.h>`
29	`#include <string.h>`	29	`#include <string.h>`
30	`#include <malloc.h> /* _fcalloc() */`	30	`#include <malloc.h> /* _fcalloc() */`
31		31
32	`#include "mdr\cout.h"`	32	`#include "mdr\cout.h"`
33	`#include "mdr\dos.h"`	33	`#include "mdr\dos.h"`
34	`#include "mdr\keyb.h"`	34	`#include "mdr\keyb.h"`
35		35
36	`#include "svarlang\svarlang.h"`	36	`#include "svarlang\svarlang.h"`
37		37
38	`#define COL_TXT 0`	38	`#define COL_TXT 0`
39	`#define COL_STATUSBAR1 1`	39	`#define COL_STATUSBAR1 1`
40	`#define COL_STATUSBAR2 2`	40	`#define COL_STATUSBAR2 2`
41	`#define COL_SCROLLBAR 3`	41	`#define COL_SCROLLBAR 3`
42	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	42	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
43	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`	43	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`
44		44
45	`#define SCROLL_CURSOR 0xB1`	45	`#define SCROLL_CURSOR 0xB1`
46		46
47		47
48	`struct line {`	48	`struct line {`
49	`struct line far *prev;`	49	`struct line far *prev;`
50	`struct line far *next;`	50	`struct line far *next;`
51	`unsigned short len;`	51	`unsigned short len;`
52	`char payload[1];`	52	`char payload[1];`
53	`};`	53	`};`
54		54
55	`struct linedb {`	55	`struct linedb {`
56	`struct line far *topscreen;`	-
57	`struct line far *cursor;`	56	`struct line far *cursor;`
58	`unsigned short xoffset;`	57	`unsigned short xoffset;`
59	`};`	58	`};`
60		59
61		60
62	`/* returns non-zero on error */`	61	`/* returns non-zero on error */`
63	`static int line_add(struct linedb db, const char far line) {`	62	`static int line_add(struct linedb db, const char far line) {`
64	`unsigned short slen;`	63	`unsigned short slen;`
65	`struct line far *l;`	64	`struct line far *l;`
66		65
67	`/* slen = strlen(line) (but for far pointer) */`	66	`/* slen = strlen(line) (but for far pointer) */`
68	`for (slen = 0; line[slen] != 0; slen++);`	67	`for (slen = 0; line[slen] != 0; slen++);`
69		68
70	`/* trim out CR/LF line endings */`	69	`/* trim out CR/LF line endings */`
71	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	70	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
72	`slen -= 2;`	71	`slen -= 2;`
73	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	72	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
74	`slen--;`	73	`slen--;`
75	`}`	74	`}`
76		75
77	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	76	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
78	`if (l == NULL) return(-1);`	77	`if (l == NULL) return(-1);`
79		78
80	`l->prev = db->cursor;`	79	`l->prev = db->cursor;`
81	`if (db->cursor) {`	80	`if (db->cursor) {`
82	`l->next = db->cursor->next;`	81	`l->next = db->cursor->next;`
83	`db->cursor->next = l;`	82	`db->cursor->next = l;`
84	`l->next->prev = l;`	83	`l->next->prev = l;`
85	`}`	84	`}`
86	`db->cursor = l;`	85	`db->cursor = l;`
87	`_fmemcpy(l->payload, line, slen);`	86	`_fmemcpy(l->payload, line, slen);`
88	`l->len = slen;`	87	`l->len = slen;`
89		88
90	`return(0);`	89	`return(0);`
91	`}`	90	`}`
92		91
93		92
94	`static void db_rewind(struct linedb *db) {`	93	`static void db_rewind(struct linedb *db) {`
95	`if (db->cursor == NULL) return;`	94	`if (db->cursor == NULL) return;`
96	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	95	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
97	`db->topscreen = db->cursor;`	-
98	`}`	96	`}`
99		97
100		98
101	`static void load_colorscheme(void) {`	99	`static void load_colorscheme(void) {`
102	`scheme[COL_TXT] = 0x17;`	100	`scheme[COL_TXT] = 0x17;`
103	`scheme[COL_STATUSBAR1] = 0x70;`	101	`scheme[COL_STATUSBAR1] = 0x70;`
104	`scheme[COL_STATUSBAR2] = 0x78;`	102	`scheme[COL_STATUSBAR2] = 0x78;`
105	`scheme[COL_SCROLLBAR] = 0x70;`	103	`scheme[COL_SCROLLBAR] = 0x70;`
106	`}`	104	`}`
107		105
108		106
109	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {`	107	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {`
110	`unsigned char i;`	108	`unsigned char i;`
111	`const char s = svarlang_strid(0); / HELP */`	109	`const char s = svarlang_strid(0); / HELP */`
112	`unsigned char helpcol = screenw - (strlen(s) + 4);`	110	`unsigned char helpcol = screenw - (strlen(s) + 4);`
113		111
114	`/* clear screen */`	112	`/* clear screen */`
115	`mdr_cout_cls(scheme[COL_TXT]);`	113	`mdr_cout_cls(scheme[COL_TXT]);`
116		114
117	`/* status bar */`	115	`/* status bar */`
118	`for (i = 0; i < helpcol; i++) {`	116	`for (i = 0; i < helpcol; i++) {`
119	`mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);`	117	`mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);`
120	`if (*fname != 0) fname++;`	118	`if (*fname != 0) fname++;`
121	`}`	119	`}`
122	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	120	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
123	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	121	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
124		122
125	`/* scroll bar */`	123	`/* scroll bar */`
126	`for (i = 0; i < (screenh - 1); i++) {`	124	`for (i = 0; i < (screenh - 1); i++) {`
127	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	125	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
128	`}`	126	`}`
129	`}`	127	`}`
130		128
131		129
132	`static void ui_help(unsigned char screenw) {`	130	`static void ui_help(unsigned char screenw) {`
133	`#define MAXLINLEN 35`	131	`#define MAXLINLEN 35`
134	`unsigned short i, x, offset;`	132	`unsigned short i, x, offset;`
135	`offset = (screenw - MAXLINLEN + 1) >> 1;`	133	`offset = (screenw - MAXLINLEN + 1) >> 1;`
136	`mdr_cout_cursor_hide();`	134	`mdr_cout_cursor_hide();`
137	`for (i = 2; i <= 12; i++) {`	135	`for (i = 2; i <= 12; i++) {`
138	`for (x = offset - 2; x < offset + MAXLINLEN; x++) mdr_cout_char(i, x, ' ', scheme[COL_STATUSBAR1]);`	136	`for (x = offset - 2; x < offset + MAXLINLEN; x++) mdr_cout_char(i, x, ' ', scheme[COL_STATUSBAR1]);`
139	`}`	137	`}`
140		138
141	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	139	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
142	`for (i = 0; i <= 2; i++) {`	140	`for (i = 0; i <= 2; i++) {`
143	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	141	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
144	`}`	142	`}`
145	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	143	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
146	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	144	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
147		145
148	`keyb_getkey();`	146	`keyb_getkey();`
149	`mdr_cout_cursor_show();`	147	`mdr_cout_cursor_show();`
150	`#undef MAXLINLEN`	148	`#undef MAXLINLEN`
151	`}`	149	`}`
152		150
153		151
154	`static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	152	`static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto, unsigned char y) {`
155	`unsigned char y = 0;`	-
156	`unsigned char len;`	153	`unsigned char len;`
157	`struct line far *l;`	154	`const struct line far *l;`
158		155
159	`#ifdef DBG_REFRESH`	156	`#ifdef DBG_REFRESH`
160	`static char m = 'a';`	157	`static char m = 'a';`
161	`m++;`	158	`m++;`
162	`if (m > 'z') m = 'a';`	159	`if (m > 'z') m = 'a';`
163	`#endif`	160	`#endif`
164		161
-		162	`/* rewind cursor line to first line that needs redrawing */`
-		163	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`
-		164
-		165	`/* iterate over lines and redraw whatever needs to be redrawn */`
165	`for (l = db->topscreen; l != NULL; l = l->next, y++) {`	166	`for (; l != NULL; l = l->next, y++) {`
166		167
167	`/* skip lines that do not to be refreshed */`	168	`/* skip lines that do not need to be refreshed */`
168	`if (y < uidirtyfrom) continue;`	169	`if (y < uidirtyfrom) continue;`
169	`if (y > uidirtyto) break;`	170	`if (y > uidirtyto) break;`
170		171
171	`if (db->xoffset < l->len) {`	172	`if (db->xoffset < l->len) {`
172	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`	173	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`
173	`} else {`	174	`} else {`
174	`len = 0;`	175	`len = 0;`
175	`}`	176	`}`
176	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`	177	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`
177		178
178	`#ifdef DBG_REFRESH`	179	`#ifdef DBG_REFRESH`
179	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	180	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
180	`#endif`	181	`#endif`
181		182
182	`if (y == screenh - 2) break;`	183	`if (y == screenh - 2) break;`
183	`}`	184	`}`
-		185
184	`}`	186	`}`
185		187
186		188
187	`static void check_cursor_not_after_eol(struct linedb db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	189	`static void check_cursor_not_after_eol(struct linedb db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
188	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`	190	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`
189		191
190	`if (db->cursor->len < db->xoffset) {`	192	`if (db->cursor->len < db->xoffset) {`
191	`*cursorpos = 0;`	193	`*cursorpos = 0;`
192	`db->xoffset = db->cursor->len;`	194	`db->xoffset = db->cursor->len;`
193	`*uidirtyfrom = 0;`	195	`*uidirtyfrom = 0;`
194	`*uidirtyto = 0xff;`	196	`*uidirtyto = 0xff;`
195	`} else {`	197	`} else {`
196	`*cursorpos = db->cursor->len - db->xoffset;`	198	`*cursorpos = db->cursor->len - db->xoffset;`
197	`}`	199	`}`
198	`}`	200	`}`
199		201
200		202
201	`static void cursor_up(struct linedb db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	203	`static void cursor_up(struct linedb db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
202	`if (db->cursor->prev != NULL) {`	204	`if (db->cursor->prev != NULL) {`
203	`db->cursor = db->cursor->prev;`	205	`db->cursor = db->cursor->prev;`
204	`if (*cursorposy == 0) {`	206	`if (*cursorposy == 0) {`
205	`db->topscreen = db->cursor;`	-
206	`*uidirtyfrom = 0;`	207	`*uidirtyfrom = 0;`
207	`*uidirtyto = 0xff;`	208	`*uidirtyto = 0xff;`
208	`} else {`	209	`} else {`
209	`*cursorposy -= 1;`	210	`*cursorposy -= 1;`
210	`}`	211	`}`
211	`}`	212	`}`
212	`}`	213	`}`
213		214
214		215
215	`static void cursor_eol(struct linedb db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	216	`static void cursor_eol(struct linedb db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
216	`/* adjust xoffset to make sure eol is visible on screen */`	217	`/* adjust xoffset to make sure eol is visible on screen */`
217	`if (db->xoffset > db->cursor->len) {`	218	`if (db->xoffset > db->cursor->len) {`
218	`db->xoffset = db->cursor->len - 1;`	219	`db->xoffset = db->cursor->len - 1;`
219	`*uidirtyfrom = 0;`	220	`*uidirtyfrom = 0;`
220	`*uidirtyto = 0xff;`	221	`*uidirtyto = 0xff;`
221	`}`	222	`}`
222		223
223	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	224	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
224	`db->xoffset = db->cursor->len - screenw + 2;`	225	`db->xoffset = db->cursor->len - screenw + 2;`
225	`*uidirtyfrom = 0;`	226	`*uidirtyfrom = 0;`
226	`*uidirtyto = 0xff;`	227	`*uidirtyto = 0xff;`
227	`}`	228	`}`
228	`*cursorposx = db->cursor->len - db->xoffset;`	229	`*cursorposx = db->cursor->len - db->xoffset;`
229	`}`	230	`}`
230		231
231		232
232	`static void cursor_down(struct linedb db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	233	`static void cursor_down(struct linedb db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
233	`if (db->cursor->next != NULL) {`	234	`if (db->cursor->next != NULL) {`
234	`db->cursor = db->cursor->next;`	235	`db->cursor = db->cursor->next;`
235	`if (*cursorposy < screenh - 2) {`	236	`if (*cursorposy < screenh - 2) {`
236	`*cursorposy += 1;`	237	`*cursorposy += 1;`
237	`} else {`	238	`} else {`
238	`db->topscreen = db->topscreen->next;`	-
239	`*uidirtyfrom = 0;`	239	`*uidirtyfrom = 0;`
240	`*uidirtyto = 0xff;`	240	`*uidirtyto = 0xff;`
241	`}`	241	`}`
242	`}`	242	`}`
243	`}`	243	`}`
244		244
245		245
246	`static void cursor_left(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	246	`static void cursor_left(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
247	`if (*cursorposx > 0) {`	247	`if (*cursorposx > 0) {`
248	`*cursorposx -= 1;`	248	`*cursorposx -= 1;`
249	`} else if (db->xoffset > 0) {`	249	`} else if (db->xoffset > 0) {`
250	`db->xoffset -= 1;`	250	`db->xoffset -= 1;`
251	`*uidirtyfrom = 0;`	251	`*uidirtyfrom = 0;`
252	`*uidirtyto = 0xff;`	252	`*uidirtyto = 0xff;`
253	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	253	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
254	`cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);`	254	`cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);`
255	`cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);`	255	`cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);`
256	`}`	256	`}`
257	`}`	257	`}`
258		258
259		259
260	`static void cursor_home(struct linedb db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	260	`static void cursor_home(struct linedb db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
261	`*cursorposx = 0;`	261	`*cursorposx = 0;`
262	`if (db->xoffset != 0) {`	262	`if (db->xoffset != 0) {`
263	`db->xoffset = 0;`	263	`db->xoffset = 0;`
264	`*uidirtyfrom = 0;`	264	`*uidirtyfrom = 0;`
265	`*uidirtyto = 0xff;`	265	`*uidirtyto = 0xff;`
266	`}`	266	`}`
267	`}`	267	`}`
268		268
269		269
270	`static void cursor_right(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	270	`static void cursor_right(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
271	`if (db->cursor->len > db->xoffset + *cursorposx) {`	271	`if (db->cursor->len > db->xoffset + *cursorposx) {`
272	`if (*cursorposx < screenw - 2) {`	272	`if (*cursorposx < screenw - 2) {`
273	`*cursorposx += 1;`	273	`*cursorposx += 1;`
274	`} else {`	274	`} else {`
275	`db->xoffset += 1;`	275	`db->xoffset += 1;`
276	`*uidirtyfrom = 0;`	276	`*uidirtyfrom = 0;`
277	`*uidirtyto = 0xff;`	277	`*uidirtyto = 0xff;`
278	`}`	278	`}`
279	`} else {`	279	`} else {`
280	`cursor_down(db, cursorposy, screenh, uidirtyfrom, uidirtyto);`	280	`cursor_down(db, cursorposy, screenh, uidirtyfrom, uidirtyto);`
281	`cursor_home(db, cursorposx, uidirtyfrom, uidirtyto);`	281	`cursor_home(db, cursorposx, uidirtyfrom, uidirtyto);`
282	`}`	282	`}`
283	`}`	283	`}`
284		284
285		285
286	`static void del(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	286	`static void del(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
287	`if (cursorposx + db->xoffset < db->cursor->len) {`	287	`if (cursorposx + db->xoffset < db->cursor->len) {`
288	`_fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);`	288	`_fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);`
289	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	289	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
290	`*uidirtyfrom = cursorposy;`	290	`*uidirtyfrom = cursorposy;`
291	`*uidirtyto = cursorposy;`	291	`*uidirtyto = cursorposy;`
292	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	292	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
293	`struct line far *nextline = db->cursor->next;`	293	`struct line far *nextline = db->cursor->next;`
294	`if (db->cursor->next->len > 0) {`	294	`if (db->cursor->next->len > 0) {`
295	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	295	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
296	`if (newptr != NULL) {`	296	`if (newptr != NULL) {`
297	`db->cursor = newptr;`	297	`db->cursor = newptr;`
298	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	298	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
299	`db->cursor->len += db->cursor->next->len;`	299	`db->cursor->len += db->cursor->next->len;`
300	`/* update db->topscreen if needed */`	-
301	`if (cursorposy == 0) db->topscreen = db->cursor;`	-
302	`}`	300	`}`
303	`}`	301	`}`
304	`db->cursor->next = db->cursor->next->next;`	302	`db->cursor->next = db->cursor->next->next;`
305	`db->cursor->next->prev = db->cursor;`	303	`db->cursor->next->prev = db->cursor;`
306	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	304	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
307	`_ffree(nextline);`	305	`_ffree(nextline);`
308	`*uidirtyfrom = cursorposy;`	306	`*uidirtyfrom = cursorposy;`
309	`*uidirtyto = 0xff;`	307	`*uidirtyto = 0xff;`
310	`}`	308	`}`
311	`}`	309	`}`
312		310
313		311
314	`static void bkspc(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	312	`static void bkspc(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
315		313
316	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	314	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
317	`if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	315	`if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
318		316
319	`cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);`	317	`cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);`
320	`del(db, cursorposx, cursorposy, uidirtyfrom, uidirtyto);`	318	`del(db, cursorposx, cursorposy, uidirtyfrom, uidirtyto);`
321	`}`	319	`}`
322		320
323		321
324	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	322	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
325	`* of argc and argv, saves some 330 bytes of binary size */`	323	`* of argc and argv, saves some 330 bytes of binary size */`
326	`static char *parseargv(void) {`	324	`static char *parseargv(void) {`
327	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	325	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
328	`unsigned char count = 0;`	326	`unsigned char count = 0;`
329	`char *argv[4];`	327	`char *argv[4];`
330		328
331	`while (count < 4) {`	329	`while (count < 4) {`
332	`/* jump to nearest arg */`	330	`/* jump to nearest arg */`
333	`while (*tail == ' ') {`	331	`while (*tail == ' ') {`
334	`*tail = 0;`	332	`*tail = 0;`
335	`tail++;`	333	`tail++;`
336	`}`	334	`}`
337		335
338	`if (*tail == '\r') {`	336	`if (*tail == '\r') {`
339	`*tail = 0;`	337	`*tail = 0;`
340	`break;`	338	`break;`
341	`}`	339	`}`
342		340
343	`argv[count++] = tail;`	341	`argv[count++] = tail;`
344		342
345	`/* jump to next delimiter */`	343	`/* jump to next delimiter */`
346	`while ((tail != ' ') && (tail != '\r')) tail++;`	344	`while ((tail != ' ') && (tail != '\r')) tail++;`
347	`}`	345	`}`
348		346
349	`/* check args now */`	347	`/* check args now */`
350	`if (count != 1) return(NULL);`	348	`if (count != 1) return(NULL);`
351		349
352	`return(argv[0]);`	350	`return(argv[0]);`
353	`}`	351	`}`
354		352
355		353
356	`static int loadfile(struct linedb db, const char fname) {`	354	`static int loadfile(struct linedb db, const char fname) {`
357	`char buff[1024];`	355	`char buff[1024];`
358	`unsigned int prevlen = 0, len, llen;`	356	`unsigned int prevlen = 0, len, llen;`
359	`int fd;`	357	`int fd;`
360	`int r = 0;`	358	`int r = 0;`
361		359
362	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	360	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
363	`mdr_coutraw_puts("Failed to open file:");`	361	`mdr_coutraw_puts("Failed to open file:");`
364	`mdr_coutraw_puts(fname);`	362	`mdr_coutraw_puts(fname);`
365	`return(-1);`	363	`return(-1);`
366	`}`	364	`}`
367		365
368	`do {`	366	`do {`
369	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`	367	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`
370	`len += prevlen;`	368	`len += prevlen;`
371	`} else {`	369	`} else {`
372	`len = prevlen;`	370	`len = prevlen;`
373	`}`	371	`}`
374		372
375	`/* look for nearest \n and replace with 0*/`	373	`/* look for nearest \n and replace with 0*/`
376	`for (llen = 0; buff[llen] != '\n'; llen++) {`	374	`for (llen = 0; buff[llen] != '\n'; llen++) {`
377	`if (llen == sizeof(buff)) break;`	375	`if (llen == sizeof(buff)) break;`
378	`}`	376	`}`
379	`buff[llen] = 0;`	377	`buff[llen] = 0;`
380	`if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`	378	`if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`
381	`if (line_add(db, buff) != 0) {`	379	`if (line_add(db, buff) != 0) {`
382	`mdr_coutraw_puts("out of memory");`	380	`mdr_coutraw_puts("out of memory");`
383	`r = -1;`	381	`r = -1;`
384	`break;`	382	`break;`
385	`}`	383	`}`
386		384
387	`len -= llen + 1;`	385	`len -= llen + 1;`
388	`memmove(buff, buff + llen + 1, len);`	386	`memmove(buff, buff + llen + 1, len);`
389	`prevlen = len;`	387	`prevlen = len;`
390	`} while (len > 0);`	388	`} while (len > 0);`
391		389
392	`_dos_close(fd);`	390	`_dos_close(fd);`
393		391
394	`return(r);`	392	`return(r);`
395	`}`	393	`}`
396		394
397		395
398	`int main(void) {`	396	`int main(void) {`
399	`const char *fname;`	397	`const char *fname;`
400	`struct linedb db;`	398	`struct linedb db;`
401	`unsigned char screenw = 0, screenh = 0;`	399	`unsigned char screenw = 0, screenh = 0;`
402	`unsigned char cursorposx = 0, cursorposy = 0;`	400	`unsigned char cursorposx = 0, cursorposy = 0;`
403	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`	401	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`
404		402
405	`bzero(&db, sizeof(db));`	403	`bzero(&db, sizeof(db));`
406		404
407	`{`	405	`{`
408	`char nlspath[128], lang[8];`	406	`char nlspath[128], lang[8];`
409	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`	407	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`
410	`}`	408	`}`
411		409
412	`fname = parseargv();`	410	`fname = parseargv();`
413		411
414	`if (fname == NULL) {`	412	`if (fname == NULL) {`
415	`mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */`	413	`mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */`
416	`return(0);`	414	`return(0);`
417	`}`	415	`}`
418		416
419	`/* load file */`	417	`/* load file */`
420	`if (loadfile(&db, fname) != 0) return(1);`	418	`if (loadfile(&db, fname) != 0) return(1);`
421		419
422	`/* add an empty line at end if not present already */`	420	`/* add an empty line at end if not present already */`
423	`if (db.cursor->len != 0) line_add(&db, "");`	421	`if (db.cursor->len != 0) line_add(&db, "");`
424		422
425	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`	423	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`
426	`ui_basic(screenw, screenh, fname);`	424	`ui_basic(screenw, screenh, fname);`
427		425
428	`db_rewind(&db);`	426	`db_rewind(&db);`
429		427
430	`for (;;) {`	428	`for (;;) {`
431	`int k;`	429	`int k;`
432		430
433	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	431	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
434	`mdr_cout_locate(cursorposy, cursorposx);`	432	`mdr_cout_locate(cursorposy, cursorposx);`
435		433
436	`if (uidirtyfrom != 0xff) {`	434	`if (uidirtyfrom != 0xff) {`
437	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);`	435	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto, cursorposy);`
438	`uidirtyfrom = 0xff;`	436	`uidirtyfrom = 0xff;`
439	`}`	437	`}`
440		438
441	`k = keyb_getkey();`	439	`k = keyb_getkey();`
442		440
443	`if (k == 0x150) { /* down */`	441	`if (k == 0x150) { /* down */`
444	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`	442	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`
445		443
446	`} else if (k == 0x148) { /* up */`	444	`} else if (k == 0x148) { /* up */`
447	`cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);`	445	`cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);`
448		446
449	`} else if (k == 0x14D) { /* right */`	447	`} else if (k == 0x14D) { /* right */`
450	`cursor_right(&db, &cursorposx, &cursorposy, screenw, screenh, &uidirtyfrom, &uidirtyto);`	448	`cursor_right(&db, &cursorposx, &cursorposy, screenw, screenh, &uidirtyfrom, &uidirtyto);`
451		449
452	`} else if (k == 0x14B) { /* left */`	450	`} else if (k == 0x14B) { /* left */`
453	`cursor_left(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`	451	`cursor_left(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`
454		452
455	`} else if (k == 0x149) { /* pgup */`	453	`} else if (k == 0x149) { /* pgup */`
456	`// TODO`	454	`// TODO`
457		455
458	`} else if (k == 0x151) { /* pgdown */`	456	`} else if (k == 0x151) { /* pgdown */`
459	`// TODO`	457	`// TODO`
460		458
461	`} else if (k == 0x147) { /* home */`	459	`} else if (k == 0x147) { /* home */`
462	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	460	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
463		461
464	`} else if (k == 0x14F) { /* end */`	462	`} else if (k == 0x14F) { /* end */`
465	`cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);`	463	`cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);`
466		464
467	`} else if (k == 0x1B) { /* ESC */`	465	`} else if (k == 0x1B) { /* ESC */`
468	`break;`	466	`break;`
469		467
470	`} else if (k == 0x0D) { /* ENTER */`	468	`} else if (k == 0x0D) { /* ENTER */`
471	`/* add a new line */`	469	`/* add a new line */`
472	`if (line_add(&db, db.cursor->payload + db.xoffset + cursorposx) == 0) {`	470	`if (line_add(&db, db.cursor->payload + db.xoffset + cursorposx) == 0) {`
473	`/* trim the line above */`	471	`/* trim the line above */`
474	`db.cursor->prev->len = db.xoffset + cursorposx;`	472	`db.cursor->prev->len = db.xoffset + cursorposx;`
475	`db.cursor->prev->payload[db.cursor->prev->len] = 0;`	473	`db.cursor->prev->payload[db.cursor->prev->len] = 0;`
476	`/* move cursor to the (new) line below */`	474	`/* move cursor to the (new) line below */`
477	`cursorposx = 0;`	475	`cursorposx = 0;`
478	`if (cursorposy < screenh - 2) {`	476	`if (cursorposy < screenh - 2) {`
479	`uidirtyfrom = cursorposy;`	477	`uidirtyfrom = cursorposy;`
480	`cursorposy++;`	478	`cursorposy++;`
481	`} else {`	479	`} else {`
482	`db.topscreen = db.topscreen->next;`	-
483	`uidirtyfrom = 0;`	480	`uidirtyfrom = 0;`
484	`}`	481	`}`
485	`uidirtyto = 0xff;`	482	`uidirtyto = 0xff;`
486	`} else {`	483	`} else {`
487	`/* ERROR: OUT OF MEMORY */`	484	`/* ERROR: OUT OF MEMORY */`
488	`}`	485	`}`
489		486
490	`} else if (k == 0x153) { /* DEL */`	487	`} else if (k == 0x153) { /* DEL */`
491	`del(&db, cursorposx, cursorposy, &uidirtyfrom, &uidirtyto);`	488	`del(&db, cursorposx, cursorposy, &uidirtyfrom, &uidirtyto);`
492		489
493	`} else if (k == 0x008) { /* BKSPC */`	490	`} else if (k == 0x008) { /* BKSPC */`
494	`bkspc(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`	491	`bkspc(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`
495		492

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1622 – Rev 1309 → 1310