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\bios.h"
#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_msg(const char *msg, unsigned char screenw, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  unsigned short x, y, msglen, i;
  msglen = strlen(msg);
  y = (screenh - 4) >> 1;
  x = (screenw - msglen - 4) >> 1;
  for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);
  mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);
 
  if (*uidirtyfrom > y) *uidirtyfrom = y;
  if (*uidirtyto < y+2) *uidirtyto = y+2;
}
 
 
static void ui_help(unsigned char screenw) {
#define MAXLINLEN 35
  unsigned short i, offset;
  offset = (screenw - MAXLINLEN + 1) >> 1;
  mdr_cout_cursor_hide();
  for (i = 2; i <= 12; i++) {
    mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);
  }
 
  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);
}
 
 
static int savefile(const struct linedb *db, const char *fname) {
  int fd;
  const struct line far *l;
  unsigned bytes;
  if (_dos_open(fname, O_WRONLY, &fd) != 0) {
    return(-1);
  }
 
  l = db->cursor;
  while (l->prev) l = l->prev;
 
  while (l) {
    _dos_write(fd, l->payload, l->len, &bytes);
    _dos_write(fd, "\r\n", 2, &bytes);
    l = l->next;
  }
 
  _dos_close(fd);
  return(0);
}
 
 
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 if (k == 0x13f) { /* F5 */
      const char *m[] = {"SAVED", "SAVING FILE FAILED"};
      int i;
      i = !!savefile(&db, fname);
      ui_msg(m[i], screenw, screenh, &uidirtyfrom, &uidirtyto);
      mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
 
    } 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 1311	Rev 1312
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\bios.h"`
32	`#include "mdr\cout.h"`	33	`#include "mdr\cout.h"`
33	`#include "mdr\dos.h"`	34	`#include "mdr\dos.h"`
34	`#include "mdr\keyb.h"`	35	`#include "mdr\keyb.h"`
35		36
36	`#include "svarlang\svarlang.h"`	37	`#include "svarlang\svarlang.h"`
37		38
38	`#define COL_TXT 0`	39	`#define COL_TXT 0`
39	`#define COL_STATUSBAR1 1`	40	`#define COL_STATUSBAR1 1`
40	`#define COL_STATUSBAR2 2`	41	`#define COL_STATUSBAR2 2`
41	`#define COL_SCROLLBAR 3`	42	`#define COL_SCROLLBAR 3`
42	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	43	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
43	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`	44	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`
44		45
45	`#define SCROLL_CURSOR 0xB1`	46	`#define SCROLL_CURSOR 0xB1`
46		47
47		48
48	`struct line {`	49	`struct line {`
49	`struct line far *prev;`	50	`struct line far *prev;`
50	`struct line far *next;`	51	`struct line far *next;`
51	`unsigned short len;`	52	`unsigned short len;`
52	`char payload[1];`	53	`char payload[1];`
53	`};`	54	`};`
54		55
55	`struct linedb {`	56	`struct linedb {`
56	`struct line far *cursor;`	57	`struct line far *cursor;`
57	`unsigned short xoffset;`	58	`unsigned short xoffset;`
58	`};`	59	`};`
59		60
60		61
61	`/* returns non-zero on error */`	62	`/* returns non-zero on error */`
62	`static int line_add(struct linedb db, const char far line) {`	63	`static int line_add(struct linedb db, const char far line) {`
63	`unsigned short slen;`	64	`unsigned short slen;`
64	`struct line far *l;`	65	`struct line far *l;`
65		66
66	`/* slen = strlen(line) (but for far pointer) */`	67	`/* slen = strlen(line) (but for far pointer) */`
67	`for (slen = 0; line[slen] != 0; slen++);`	68	`for (slen = 0; line[slen] != 0; slen++);`
68		69
69	`/* trim out CR/LF line endings */`	70	`/* trim out CR/LF line endings */`
70	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	71	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
71	`slen -= 2;`	72	`slen -= 2;`
72	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	73	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
73	`slen--;`	74	`slen--;`
74	`}`	75	`}`
75		76
76	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	77	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
77	`if (l == NULL) return(-1);`	78	`if (l == NULL) return(-1);`
78		79
79	`l->prev = db->cursor;`	80	`l->prev = db->cursor;`
80	`if (db->cursor) {`	81	`if (db->cursor) {`
81	`l->next = db->cursor->next;`	82	`l->next = db->cursor->next;`
82	`db->cursor->next = l;`	83	`db->cursor->next = l;`
83	`l->next->prev = l;`	84	`l->next->prev = l;`
84	`}`	85	`}`
85	`db->cursor = l;`	86	`db->cursor = l;`
86	`_fmemcpy(l->payload, line, slen);`	87	`_fmemcpy(l->payload, line, slen);`
87	`l->len = slen;`	88	`l->len = slen;`
88		89
89	`return(0);`	90	`return(0);`
90	`}`	91	`}`
91		92
92		93
93	`static void db_rewind(struct linedb *db) {`	94	`static void db_rewind(struct linedb *db) {`
94	`if (db->cursor == NULL) return;`	95	`if (db->cursor == NULL) return;`
95	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	96	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
96	`}`	97	`}`
97		98
98		99
99	`static void load_colorscheme(void) {`	100	`static void load_colorscheme(void) {`
100	`scheme[COL_TXT] = 0x17;`	101	`scheme[COL_TXT] = 0x17;`
101	`scheme[COL_STATUSBAR1] = 0x70;`	102	`scheme[COL_STATUSBAR1] = 0x70;`
102	`scheme[COL_STATUSBAR2] = 0x78;`	103	`scheme[COL_STATUSBAR2] = 0x78;`
103	`scheme[COL_SCROLLBAR] = 0x70;`	104	`scheme[COL_SCROLLBAR] = 0x70;`
104	`}`	105	`}`
105		106
106		107
107	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {`	108	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {`
108	`unsigned char i;`	109	`unsigned char i;`
109	`const char s = svarlang_strid(0); / HELP */`	110	`const char s = svarlang_strid(0); / HELP */`
110	`unsigned char helpcol = screenw - (strlen(s) + 4);`	111	`unsigned char helpcol = screenw - (strlen(s) + 4);`
111		112
112	`/* clear screen */`	113	`/* clear screen */`
113	`mdr_cout_cls(scheme[COL_TXT]);`	114	`mdr_cout_cls(scheme[COL_TXT]);`
114		115
115	`/* status bar */`	116	`/* status bar */`
116	`for (i = 0; i < helpcol; i++) {`	117	`for (i = 0; i < helpcol; i++) {`
117	`mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);`	118	`mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);`
118	`if (*fname != 0) fname++;`	119	`if (*fname != 0) fname++;`
119	`}`	120	`}`
120	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	121	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
121	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	122	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
122		123
123	`/* scroll bar */`	124	`/* scroll bar */`
124	`for (i = 0; i < (screenh - 1); i++) {`	125	`for (i = 0; i < (screenh - 1); i++) {`
125	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	126	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
126	`}`	127	`}`
127	`}`	128	`}`
128		129
129		130
-		131	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
-		132	`unsigned short x, y, msglen, i;`
-		133	`msglen = strlen(msg);`
-		134	`y = (screenh - 4) >> 1;`
-		135	`x = (screenw - msglen - 4) >> 1;`
-		136	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);`
-		137	`mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);`
-		138
-		139	`if (uidirtyfrom > y) uidirtyfrom = y;`
-		140	`if (uidirtyto < y+2) uidirtyto = y+2;`
-		141	`}`
-		142
-		143
130	`static void ui_help(unsigned char screenw) {`	144	`static void ui_help(unsigned char screenw) {`
131	`#define MAXLINLEN 35`	145	`#define MAXLINLEN 35`
132	`unsigned short i, x, offset;`	146	`unsigned short i, offset;`
133	`offset = (screenw - MAXLINLEN + 1) >> 1;`	147	`offset = (screenw - MAXLINLEN + 1) >> 1;`
134	`mdr_cout_cursor_hide();`	148	`mdr_cout_cursor_hide();`
135	`for (i = 2; i <= 12; i++) {`	149	`for (i = 2; i <= 12; i++) {`
136	`for (x = offset - 2; x < offset + MAXLINLEN; x++) mdr_cout_char(i, x, ' ', scheme[COL_STATUSBAR1]);`	150	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`
137	`}`	151	`}`
138		152
139	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	153	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
140	`for (i = 0; i <= 2; i++) {`	154	`for (i = 0; i <= 2; i++) {`
141	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	155	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
142	`}`	156	`}`
143	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	157	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
144	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	158	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
145		159
146	`keyb_getkey();`	160	`keyb_getkey();`
147	`mdr_cout_cursor_show();`	161	`mdr_cout_cursor_show();`
148	`#undef MAXLINLEN`	162	`#undef MAXLINLEN`
149	`}`	163	`}`
150		164
151		165
152	`static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto, unsigned char y) {`	166	`static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto, unsigned char y) {`
153	`unsigned char len;`	167	`unsigned char len;`
154	`const struct line far *l;`	168	`const struct line far *l;`
155		169
156	`#ifdef DBG_REFRESH`	170	`#ifdef DBG_REFRESH`
157	`static char m = 'a';`	171	`static char m = 'a';`
158	`m++;`	172	`m++;`
159	`if (m > 'z') m = 'a';`	173	`if (m > 'z') m = 'a';`
160	`#endif`	174	`#endif`
161		175
162	`/* rewind cursor line to first line that needs redrawing */`	176	`/* rewind cursor line to first line that needs redrawing */`
163	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`	177	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`
164		178
165	`/* iterate over lines and redraw whatever needs to be redrawn */`	179	`/* iterate over lines and redraw whatever needs to be redrawn */`
166	`for (; l != NULL; l = l->next, y++) {`	180	`for (; l != NULL; l = l->next, y++) {`
167		181
168	`/* skip lines that do not need to be refreshed */`	182	`/* skip lines that do not need to be refreshed */`
169	`if (y < uidirtyfrom) continue;`	183	`if (y < uidirtyfrom) continue;`
170	`if (y > uidirtyto) break;`	184	`if (y > uidirtyto) break;`
171		185
172	`if (db->xoffset < l->len) {`	186	`if (db->xoffset < l->len) {`
173	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`	187	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`
174	`} else {`	188	`} else {`
175	`len = 0;`	189	`len = 0;`
176	`}`	190	`}`
177	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`	191	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`
178		192
179	`#ifdef DBG_REFRESH`	193	`#ifdef DBG_REFRESH`
180	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	194	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
181	`#endif`	195	`#endif`
182		196
183	`if (y == screenh - 2) break;`	197	`if (y == screenh - 2) break;`
184	`}`	198	`}`
185		199
186	`}`	200	`}`
187		201
188		202
189	`static void check_cursor_not_after_eol(struct linedb db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	203	`static void check_cursor_not_after_eol(struct linedb db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
190	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`	204	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`
191		205
192	`if (db->cursor->len < db->xoffset) {`	206	`if (db->cursor->len < db->xoffset) {`
193	`*cursorpos = 0;`	207	`*cursorpos = 0;`
194	`db->xoffset = db->cursor->len;`	208	`db->xoffset = db->cursor->len;`
195	`*uidirtyfrom = 0;`	209	`*uidirtyfrom = 0;`
196	`*uidirtyto = 0xff;`	210	`*uidirtyto = 0xff;`
197	`} else {`	211	`} else {`
198	`*cursorpos = db->cursor->len - db->xoffset;`	212	`*cursorpos = db->cursor->len - db->xoffset;`
199	`}`	213	`}`
200	`}`	214	`}`
201		215
202		216
203	`static void cursor_up(struct linedb db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	217	`static void cursor_up(struct linedb db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
204	`if (db->cursor->prev != NULL) {`	218	`if (db->cursor->prev != NULL) {`
205	`db->cursor = db->cursor->prev;`	219	`db->cursor = db->cursor->prev;`
206	`if (*cursorposy == 0) {`	220	`if (*cursorposy == 0) {`
207	`*uidirtyfrom = 0;`	221	`*uidirtyfrom = 0;`
208	`*uidirtyto = 0xff;`	222	`*uidirtyto = 0xff;`
209	`} else {`	223	`} else {`
210	`*cursorposy -= 1;`	224	`*cursorposy -= 1;`
211	`}`	225	`}`
212	`}`	226	`}`
213	`}`	227	`}`
214		228
215		229
216	`static void cursor_eol(struct linedb db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	230	`static void cursor_eol(struct linedb db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
217	`/* adjust xoffset to make sure eol is visible on screen */`	231	`/* adjust xoffset to make sure eol is visible on screen */`
218	`if (db->xoffset > db->cursor->len) {`	232	`if (db->xoffset > db->cursor->len) {`
219	`db->xoffset = db->cursor->len - 1;`	233	`db->xoffset = db->cursor->len - 1;`
220	`*uidirtyfrom = 0;`	234	`*uidirtyfrom = 0;`
221	`*uidirtyto = 0xff;`	235	`*uidirtyto = 0xff;`
222	`}`	236	`}`
223		237
224	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	238	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
225	`db->xoffset = db->cursor->len - screenw + 2;`	239	`db->xoffset = db->cursor->len - screenw + 2;`
226	`*uidirtyfrom = 0;`	240	`*uidirtyfrom = 0;`
227	`*uidirtyto = 0xff;`	241	`*uidirtyto = 0xff;`
228	`}`	242	`}`
229	`*cursorposx = db->cursor->len - db->xoffset;`	243	`*cursorposx = db->cursor->len - db->xoffset;`
230	`}`	244	`}`
231		245
232		246
233	`static void cursor_down(struct linedb db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	247	`static void cursor_down(struct linedb db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
234	`if (db->cursor->next != NULL) {`	248	`if (db->cursor->next != NULL) {`
235	`db->cursor = db->cursor->next;`	249	`db->cursor = db->cursor->next;`
236	`if (*cursorposy < screenh - 2) {`	250	`if (*cursorposy < screenh - 2) {`
237	`*cursorposy += 1;`	251	`*cursorposy += 1;`
238	`} else {`	252	`} else {`
239	`*uidirtyfrom = 0;`	253	`*uidirtyfrom = 0;`
240	`*uidirtyto = 0xff;`	254	`*uidirtyto = 0xff;`
241	`}`	255	`}`
242	`}`	256	`}`
243	`}`	257	`}`
244		258
245		259
246	`static void cursor_left(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	260	`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) {`	261	`if (*cursorposx > 0) {`
248	`*cursorposx -= 1;`	262	`*cursorposx -= 1;`
249	`} else if (db->xoffset > 0) {`	263	`} else if (db->xoffset > 0) {`
250	`db->xoffset -= 1;`	264	`db->xoffset -= 1;`
251	`*uidirtyfrom = 0;`	265	`*uidirtyfrom = 0;`
252	`*uidirtyto = 0xff;`	266	`*uidirtyto = 0xff;`
253	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	267	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
254	`cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);`	268	`cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);`
255	`cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);`	269	`cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);`
256	`}`	270	`}`
257	`}`	271	`}`
258		272
259		273
260	`static void cursor_home(struct linedb db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	274	`static void cursor_home(struct linedb db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
261	`*cursorposx = 0;`	275	`*cursorposx = 0;`
262	`if (db->xoffset != 0) {`	276	`if (db->xoffset != 0) {`
263	`db->xoffset = 0;`	277	`db->xoffset = 0;`
264	`*uidirtyfrom = 0;`	278	`*uidirtyfrom = 0;`
265	`*uidirtyto = 0xff;`	279	`*uidirtyto = 0xff;`
266	`}`	280	`}`
267	`}`	281	`}`
268		282
269		283
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) {`	284	`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) {`	285	`if (db->cursor->len > db->xoffset + *cursorposx) {`
272	`if (*cursorposx < screenw - 2) {`	286	`if (*cursorposx < screenw - 2) {`
273	`*cursorposx += 1;`	287	`*cursorposx += 1;`
274	`} else {`	288	`} else {`
275	`db->xoffset += 1;`	289	`db->xoffset += 1;`
276	`*uidirtyfrom = 0;`	290	`*uidirtyfrom = 0;`
277	`*uidirtyto = 0xff;`	291	`*uidirtyto = 0xff;`
278	`}`	292	`}`
279	`} else {`	293	`} else {`
280	`cursor_down(db, cursorposy, screenh, uidirtyfrom, uidirtyto);`	294	`cursor_down(db, cursorposy, screenh, uidirtyfrom, uidirtyto);`
281	`cursor_home(db, cursorposx, uidirtyfrom, uidirtyto);`	295	`cursor_home(db, cursorposx, uidirtyfrom, uidirtyto);`
282	`}`	296	`}`
283	`}`	297	`}`
284		298
285		299
286	`static void del(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	300	`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) {`	301	`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);`	302	`_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 */`	303	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
290	`*uidirtyfrom = cursorposy;`	304	`*uidirtyfrom = cursorposy;`
291	`*uidirtyto = cursorposy;`	305	`*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) */`	306	`} 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;`	307	`struct line far *nextline = db->cursor->next;`
294	`if (db->cursor->next->len > 0) {`	308	`if (db->cursor->next->len > 0) {`
295	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	309	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
296	`if (newptr != NULL) {`	310	`if (newptr != NULL) {`
297	`db->cursor = newptr;`	311	`db->cursor = newptr;`
298	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	312	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
299	`db->cursor->len += db->cursor->next->len;`	313	`db->cursor->len += db->cursor->next->len;`
300	`}`	314	`}`
301	`}`	315	`}`
302	`db->cursor->next = db->cursor->next->next;`	316	`db->cursor->next = db->cursor->next->next;`
303	`db->cursor->next->prev = db->cursor;`	317	`db->cursor->next->prev = db->cursor;`
304	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	318	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
305	`_ffree(nextline);`	319	`_ffree(nextline);`
306	`*uidirtyfrom = cursorposy;`	320	`*uidirtyfrom = cursorposy;`
307	`*uidirtyto = 0xff;`	321	`*uidirtyto = 0xff;`
308	`}`	322	`}`
309	`}`	323	`}`
310		324
311		325
312	`static void bkspc(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	326	`static void bkspc(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
313		327
314	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	328	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
315	`if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	329	`if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
316		330
317	`cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);`	331	`cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);`
318	`del(db, cursorposx, cursorposy, uidirtyfrom, uidirtyto);`	332	`del(db, cursorposx, cursorposy, uidirtyfrom, uidirtyto);`
319	`}`	333	`}`
320		334
321		335
322	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	336	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
323	`* of argc and argv, saves some 330 bytes of binary size */`	337	`* of argc and argv, saves some 330 bytes of binary size */`
324	`static char *parseargv(void) {`	338	`static char *parseargv(void) {`
325	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	339	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
326	`unsigned char count = 0;`	340	`unsigned char count = 0;`
327	`char *argv[4];`	341	`char *argv[4];`
328		342
329	`while (count < 4) {`	343	`while (count < 4) {`
330	`/* jump to nearest arg */`	344	`/* jump to nearest arg */`
331	`while (*tail == ' ') {`	345	`while (*tail == ' ') {`
332	`*tail = 0;`	346	`*tail = 0;`
333	`tail++;`	347	`tail++;`
334	`}`	348	`}`
335		349
336	`if (*tail == '\r') {`	350	`if (*tail == '\r') {`
337	`*tail = 0;`	351	`*tail = 0;`
338	`break;`	352	`break;`
339	`}`	353	`}`
340		354
341	`argv[count++] = tail;`	355	`argv[count++] = tail;`
342		356
343	`/* jump to next delimiter */`	357	`/* jump to next delimiter */`
344	`while ((tail != ' ') && (tail != '\r')) tail++;`	358	`while ((tail != ' ') && (tail != '\r')) tail++;`
345	`}`	359	`}`
346		360
347	`/* check args now */`	361	`/* check args now */`
348	`if (count != 1) return(NULL);`	362	`if (count != 1) return(NULL);`
349		363
350	`return(argv[0]);`	364	`return(argv[0]);`
351	`}`	365	`}`
352		366
353		367
354	`static int loadfile(struct linedb db, const char fname) {`	368	`static int loadfile(struct linedb db, const char fname) {`
355	`char buff[1024];`	369	`char buff[1024];`
356	`unsigned int prevlen = 0, len, llen;`	370	`unsigned int prevlen = 0, len, llen;`
357	`int fd;`	371	`int fd;`
358	`int r = 0;`	372	`int r = 0;`
359		373
360	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	374	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
361	`mdr_coutraw_puts("Failed to open file:");`	375	`mdr_coutraw_puts("Failed to open file:");`
362	`mdr_coutraw_puts(fname);`	376	`mdr_coutraw_puts(fname);`
363	`return(-1);`	377	`return(-1);`
364	`}`	378	`}`
365		379
366	`do {`	380	`do {`
367	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`	381	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`
368	`len += prevlen;`	382	`len += prevlen;`
369	`} else {`	383	`} else {`
370	`len = prevlen;`	384	`len = prevlen;`
371	`}`	385	`}`
372		386
373	`/* look for nearest \n and replace with 0*/`	387	`/* look for nearest \n and replace with 0*/`
374	`for (llen = 0; buff[llen] != '\n'; llen++) {`	388	`for (llen = 0; buff[llen] != '\n'; llen++) {`
375	`if (llen == sizeof(buff)) break;`	389	`if (llen == sizeof(buff)) break;`
376	`}`	390	`}`
377	`buff[llen] = 0;`	391	`buff[llen] = 0;`
378	`if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`	392	`if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`
379	`if (line_add(db, buff) != 0) {`	393	`if (line_add(db, buff) != 0) {`
380	`mdr_coutraw_puts("out of memory");`	394	`mdr_coutraw_puts("out of memory");`
381	`r = -1;`	395	`r = -1;`
382	`break;`	396	`break;`
383	`}`	397	`}`
384		398
385	`len -= llen + 1;`	399	`len -= llen + 1;`
386	`memmove(buff, buff + llen + 1, len);`	400	`memmove(buff, buff + llen + 1, len);`
387	`prevlen = len;`	401	`prevlen = len;`
388	`} while (len > 0);`	402	`} while (len > 0);`
389		403
390	`_dos_close(fd);`	404	`_dos_close(fd);`
391		405
392	`return(r);`	406	`return(r);`
393	`}`	407	`}`
394		408
395		409
396	`static int savefile(const struct linedb db, const char fname) {`	410	`static int savefile(const struct linedb db, const char fname) {`
397	`int fd;`	411	`int fd;`
398	`const struct line far *l;`	412	`const struct line far *l;`
399	`unsigned bytes;`	413	`unsigned bytes;`
400	`if (_dos_open(fname, O_WRONLY, &fd) != 0) {`	414	`if (_dos_open(fname, O_WRONLY, &fd) != 0) {`
401	`return(-1);`	415	`return(-1);`
402	`}`	416	`}`
403		417
404	`l = db->cursor;`	418	`l = db->cursor;`
405	`while (l->prev) l = l->prev;`	419	`while (l->prev) l = l->prev;`
406		420
407	`while (l) {`	421	`while (l) {`
408	`_dos_write(fd, l->payload, l->len, &bytes);`	422	`_dos_write(fd, l->payload, l->len, &bytes);`
409	`_dos_write(fd, "\r\n", 2, &bytes);`	423	`_dos_write(fd, "\r\n", 2, &bytes);`
410	`l = l->next;`	424	`l = l->next;`
411	`}`	425	`}`
412		426
413	`_dos_close(fd);`	427	`_dos_close(fd);`
414	`return(0);`	428	`return(0);`
415	`}`	429	`}`
416		430
417		431
418	`int main(void) {`	432	`int main(void) {`
419	`const char *fname;`	433	`const char *fname;`
420	`struct linedb db;`	434	`struct linedb db;`
421	`unsigned char screenw = 0, screenh = 0;`	435	`unsigned char screenw = 0, screenh = 0;`
422	`unsigned char cursorposx = 0, cursorposy = 0;`	436	`unsigned char cursorposx = 0, cursorposy = 0;`
423	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`	437	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`
424		438
425	`bzero(&db, sizeof(db));`	439	`bzero(&db, sizeof(db));`
426		440
427	`{`	441	`{`
428	`char nlspath[128], lang[8];`	442	`char nlspath[128], lang[8];`
429	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`	443	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`
430	`}`	444	`}`
431		445
432	`fname = parseargv();`	446	`fname = parseargv();`
433		447
434	`if (fname == NULL) {`	448	`if (fname == NULL) {`
435	`mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */`	449	`mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */`
436	`return(0);`	450	`return(0);`
437	`}`	451	`}`
438		452
439	`/* load file */`	453	`/* load file */`
440	`if (loadfile(&db, fname) != 0) return(1);`	454	`if (loadfile(&db, fname) != 0) return(1);`
441		455
442	`/* add an empty line at end if not present already */`	456	`/* add an empty line at end if not present already */`
443	`if (db.cursor->len != 0) line_add(&db, "");`	457	`if (db.cursor->len != 0) line_add(&db, "");`
444		458
445	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`	459	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`
446	`ui_basic(screenw, screenh, fname);`	460	`ui_basic(screenw, screenh, fname);`
447		461
448	`db_rewind(&db);`	462	`db_rewind(&db);`
449		463
450	`for (;;) {`	464	`for (;;) {`
451	`int k;`	465	`int k;`
452		466
453	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	467	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
454	`mdr_cout_locate(cursorposy, cursorposx);`	468	`mdr_cout_locate(cursorposy, cursorposx);`
455		469
456	`if (uidirtyfrom != 0xff) {`	470	`if (uidirtyfrom != 0xff) {`
457	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto, cursorposy);`	471	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto, cursorposy);`
458	`uidirtyfrom = 0xff;`	472	`uidirtyfrom = 0xff;`
459	`}`	473	`}`
460		474
461	`k = keyb_getkey();`	475	`k = keyb_getkey();`
462		476
463	`if (k == 0x150) { /* down */`	477	`if (k == 0x150) { /* down */`
464	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`	478	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`
465		479
466	`} else if (k == 0x148) { /* up */`	480	`} else if (k == 0x148) { /* up */`
467	`cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);`	481	`cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);`
468		482
469	`} else if (k == 0x14D) { /* right */`	483	`} else if (k == 0x14D) { /* right */`
470	`cursor_right(&db, &cursorposx, &cursorposy, screenw, screenh, &uidirtyfrom, &uidirtyto);`	484	`cursor_right(&db, &cursorposx, &cursorposy, screenw, screenh, &uidirtyfrom, &uidirtyto);`
471		485
472	`} else if (k == 0x14B) { /* left */`	486	`} else if (k == 0x14B) { /* left */`
473	`cursor_left(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`	487	`cursor_left(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`
474		488
475	`} else if (k == 0x149) { /* pgup */`	489	`} else if (k == 0x149) { /* pgup */`
476	`// TODO`	490	`// TODO`
477		491
478	`} else if (k == 0x151) { /* pgdown */`	492	`} else if (k == 0x151) { /* pgdown */`
479	`// TODO`	493	`// TODO`
480		494
481	`} else if (k == 0x147) { /* home */`	495	`} else if (k == 0x147) { /* home */`
482	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	496	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
483		497
484	`} else if (k == 0x14F) { /* end */`	498	`} else if (k == 0x14F) { /* end */`
485	`cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);`	499	`cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);`
486		500

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1549 – Rev 1311 → 1312