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 file {
  struct line far *cursor;
  unsigned short xoffset;
  unsigned char cursorposx;
  unsigned char cursorposy;
  char lfonly; /* set if line endings are LF (CR/LF otherwise) */
};
 
 
/* returns non-zero on error */
static int line_add(struct file *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 file *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, const struct file *db) {
  unsigned char i;
  const char *s = svarlang_strid(0); /* HELP */
  unsigned char helpcol = screenw - (strlen(s) + 4);
 
  /* fill status bar with background */
  mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);
 
  /* filename */
  mdr_cout_str(screenh - 1, 0, fname, scheme[COL_STATUSBAR1], screenw);
 
  /* eol type */
  if (db->lfonly) {
    mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);
  } else {
    mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);
  }
 
  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 file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {
  unsigned char x;
  const struct line far *l;
  unsigned char y = db->cursorposy;
 
#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;
 
    x = 0;
    if (db->xoffset < l->len) {
      unsigned char i, limit;
      if (l->len - db->xoffset < screenw) {
        limit = l->len;
      } else {
        limit = db->xoffset + screenw - 1;
      }
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);
    }
 
    /* write empty spaces until end of line */
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);
 
#ifdef DBG_REFRESH
    mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
#endif
 
    if (y == screenh - 2) break;
  }
 
  while (y < screenh - 1) {
    mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);
  }
}
 
 
static void check_cursor_not_after_eol(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
 
  if (db->cursor->len < db->xoffset) {
    db->cursorposx = 0;
    db->xoffset = db->cursor->len;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  } else {
    db->cursorposx = db->cursor->len - db->xoffset;
  }
}
 
 
static void cursor_up(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->prev != NULL) {
    db->cursor = db->cursor->prev;
    if (db->cursorposy == 0) {
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    } else {
      db->cursorposy -= 1;
    }
  }
}
 
 
static void cursor_eol(struct file *db, 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;
  }
  db->cursorposx = db->cursor->len - db->xoffset;
}
 
 
static void cursor_down(struct file *db, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->next != NULL) {
    db->cursor = db->cursor->next;
    if (db->cursorposy < screenh - 2) {
      db->cursorposy += 1;
    } else {
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    }
  }
}
 
 
static void cursor_left(struct file *db, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursorposx > 0) {
    db->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, uidirtyfrom, uidirtyto);
    cursor_eol(db, screenw, uidirtyfrom, uidirtyto);
  }
}
 
 
static void cursor_home(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  db->cursorposx = 0;
  if (db->xoffset != 0) {
    db->xoffset = 0;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
}
 
 
static void cursor_right(struct file *db, unsigned char screenw, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->len > db->xoffset + db->cursorposx) {
    if (db->cursorposx < screenw - 2) {
      db->cursorposx += 1;
    } else {
      db->xoffset += 1;
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    }
  } else {
    cursor_down(db, screenh, uidirtyfrom, uidirtyto);
    cursor_home(db, uidirtyfrom, uidirtyto);
  }
}
 
 
static void del(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursorposx + db->xoffset < db->cursor->len) {
    _fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
    *uidirtyfrom = db->cursorposy;
    *uidirtyto = db->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 = db->cursorposy;
    *uidirtyto = 0xff;
  }
}
 
 
static void bkspc(struct file *db, 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 ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
 
  cursor_left(db, screenw, uidirtyfrom, uidirtyto);
  del(db, 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 file *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);
  }
 
  db->lfonly = 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] == '\r')) {
      buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */
      db->lfonly = 0;
    }
    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 file *db, const char *fname) {
  int fd;
  const struct line far *l;
  unsigned bytes;
  unsigned char eollen;
  unsigned char eolbuf[2];
 
  if (_dos_open(fname, O_WRONLY, &fd) != 0) {
    return(-1);
  }
 
  l = db->cursor;
  while (l->prev) l = l->prev;
 
  /* preset line terminators */
  if (db->lfonly) {
    eolbuf[0] = '\n';
    eollen = 1;
  } else {
    eolbuf[0] = '\r';
    eolbuf[1] = '\n';
    eollen = 2;
  }
 
  while (l) {
    _dos_write(fd, l->payload, l->len, &bytes);
    _dos_write(fd, eolbuf, eollen, &bytes);
    l = l->next;
  }
 
  _dos_close(fd);
  return(0);
}
 
 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len, unsigned char screenw, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  struct line far *n;
  n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);
  if (n != NULL) {
    unsigned short off = db->xoffset + db->cursorposx;
    if (n->prev) n->prev->next = n;
    if (n->next) n->next->prev = n;
    db->cursor = n;
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
    db->cursor->len += len;
    *uidirtyfrom = db->cursorposy;
    *uidirtyto = db->cursorposy;
    while (len--) {
      db->cursor->payload[off++] = *databuf;
      databuf++;
      cursor_right(db, screenw, screenh, uidirtyfrom, uidirtyto);
    }
  }
}
 
 
int main(void) {
  const char *fname;
  struct file db;
  unsigned char screenw = 0, screenh = 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);
 
  db_rewind(&db);
 
  for (;;) {
    int k;
 
    check_cursor_not_after_eol(&db, &uidirtyfrom, &uidirtyto);
    mdr_cout_locate(db.cursorposy, db.cursorposx);
 
    if (uidirtyfrom != 0xff) {
      ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);
      uidirtyfrom = 0xff;
    }
 
    k = keyb_getkey();
 
    if (k == 0x150) { /* down */
      cursor_down(&db, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x148) { /* up */
      cursor_up(&db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14D) { /* right */
      cursor_right(&db, screenw, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14B) { /* left */
      cursor_left(&db, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x149) { /* pgup */
      // TODO
 
    } else if (k == 0x151) { /* pgdown */
      // TODO
 
    } else if (k == 0x147) { /* home */
       cursor_home(&db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14F) { /* end */
       cursor_eol(&db, 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 + db.cursorposx) == 0) {
        /* trim the line above */
        db.cursor->prev->len = db.xoffset + db.cursorposx;
        db.cursor->prev->payload[db.cursor->prev->len] = 0;
        /* move cursor to the (new) line below */
        db.cursorposx = 0;
        if (db.cursorposy < screenh - 2) {
          uidirtyfrom = db.cursorposy;
          db.cursorposy++;
        } else {
          uidirtyfrom = 0;
        }
        uidirtyto = 0xff;
      } else {
        /* ERROR: OUT OF MEMORY */
      }
 
    } else if (k == 0x153) {  /* DEL */
      del(&db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x008) { /* BKSPC */
      bkspc(&db, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
      char c = k;
      insert_in_line(&db, &c, 1, screenw, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x009) { /* TAB */
      const char *tab = "        ";
      insert_in_line(&db, tab, 8, 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 if (k == 0x144) { /* F10 */
      db.lfonly ^= 1;
      ui_basic(screenw, screenh, fname, &db);
 
    } 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 1317	Rev 1318
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\bios.h"`
33	`#include "mdr\cout.h"`	33	`#include "mdr\cout.h"`
34	`#include "mdr\dos.h"`	34	`#include "mdr\dos.h"`
35	`#include "mdr\keyb.h"`	35	`#include "mdr\keyb.h"`
36		36
37	`#include "svarlang\svarlang.h"`	37	`#include "svarlang\svarlang.h"`
38		38
39	`#define COL_TXT 0`	39	`#define COL_TXT 0`
40	`#define COL_STATUSBAR1 1`	40	`#define COL_STATUSBAR1 1`
41	`#define COL_STATUSBAR2 2`	41	`#define COL_STATUSBAR2 2`
42	`#define COL_SCROLLBAR 3`	42	`#define COL_SCROLLBAR 3`
43	`/* 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) */`
44	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`	44	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`
45		45
46	`#define SCROLL_CURSOR 0xB1`	46	`#define SCROLL_CURSOR 0xB1`
47		47
48		48
49	`struct line {`	49	`struct line {`
50	`struct line far *prev;`	50	`struct line far *prev;`
51	`struct line far *next;`	51	`struct line far *next;`
52	`unsigned short len;`	52	`unsigned short len;`
53	`char payload[1];`	53	`char payload[1];`
54	`};`	54	`};`
55		55
56	`struct file {`	56	`struct file {`
57	`struct line far *cursor;`	57	`struct line far *cursor;`
58	`unsigned short xoffset;`	58	`unsigned short xoffset;`
59	`unsigned char cursorposx;`	59	`unsigned char cursorposx;`
60	`unsigned char cursorposy;`	60	`unsigned char cursorposy;`
61	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	61	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
62	`};`	62	`};`
63		63
64		64
65	`/* returns non-zero on error */`	65	`/* returns non-zero on error */`
66	`static int line_add(struct file db, const char far line) {`	66	`static int line_add(struct file db, const char far line) {`
67	`unsigned short slen;`	67	`unsigned short slen;`
68	`struct line far *l;`	68	`struct line far *l;`
69		69
70	`/* slen = strlen(line) (but for far pointer) */`	70	`/* slen = strlen(line) (but for far pointer) */`
71	`for (slen = 0; line[slen] != 0; slen++);`	71	`for (slen = 0; line[slen] != 0; slen++);`
72		72
73	`/* trim out CR/LF line endings */`	73	`/* trim out CR/LF line endings */`
74	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	74	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
75	`slen -= 2;`	75	`slen -= 2;`
76	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	76	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
77	`slen--;`	77	`slen--;`
78	`}`	78	`}`
79		79
80	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	80	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
81	`if (l == NULL) return(-1);`	81	`if (l == NULL) return(-1);`
82		82
83	`l->prev = db->cursor;`	83	`l->prev = db->cursor;`
84	`if (db->cursor) {`	84	`if (db->cursor) {`
85	`l->next = db->cursor->next;`	85	`l->next = db->cursor->next;`
86	`db->cursor->next = l;`	86	`db->cursor->next = l;`
87	`l->next->prev = l;`	87	`l->next->prev = l;`
88	`}`	88	`}`
89	`db->cursor = l;`	89	`db->cursor = l;`
90	`_fmemcpy(l->payload, line, slen);`	90	`_fmemcpy(l->payload, line, slen);`
91	`l->len = slen;`	91	`l->len = slen;`
92		92
93	`return(0);`	93	`return(0);`
94	`}`	94	`}`
95		95
96		96
97	`static void db_rewind(struct file *db) {`	97	`static void db_rewind(struct file *db) {`
98	`if (db->cursor == NULL) return;`	98	`if (db->cursor == NULL) return;`
99	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	99	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
100	`}`	100	`}`
101		101
102		102
103	`static void load_colorscheme(void) {`	103	`static void load_colorscheme(void) {`
104	`scheme[COL_TXT] = 0x17;`	104	`scheme[COL_TXT] = 0x17;`
105	`scheme[COL_STATUSBAR1] = 0x70;`	105	`scheme[COL_STATUSBAR1] = 0x70;`
106	`scheme[COL_STATUSBAR2] = 0x78;`	106	`scheme[COL_STATUSBAR2] = 0x78;`
107	`scheme[COL_SCROLLBAR] = 0x70;`	107	`scheme[COL_SCROLLBAR] = 0x70;`
108	`}`	108	`}`
109		109
110		110
111	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char fname, const struct file db) {`	111	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char fname, const struct file db) {`
112	`unsigned char i;`	112	`unsigned char i;`
113	`const char s = svarlang_strid(0); / HELP */`	113	`const char s = svarlang_strid(0); / HELP */`
114	`unsigned char helpcol = screenw - (strlen(s) + 4);`	114	`unsigned char helpcol = screenw - (strlen(s) + 4);`
115		115
116	`/* fill status bar with background */`	116	`/* fill status bar with background */`
117	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`	117	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`
118		118
119	`/* filename */`	119	`/* filename */`
120	`mdr_cout_str(screenh - 1, 0, fname, scheme[COL_STATUSBAR1], screenw);`	120	`mdr_cout_str(screenh - 1, 0, fname, scheme[COL_STATUSBAR1], screenw);`
121		121
122	`/* eol type */`	122	`/* eol type */`
123	`if (db->lfonly) {`	123	`if (db->lfonly) {`
124	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`	124	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`
125	`} else {`	125	`} else {`
126	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`	126	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`
127	`}`	127	`}`
128		128
129	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	129	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
130	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	130	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
131		131
132	`/* scroll bar */`	132	`/* scroll bar */`
133	`for (i = 0; i < (screenh - 1); i++) {`	133	`for (i = 0; i < (screenh - 1); i++) {`
134	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	134	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
135	`}`	135	`}`
136	`}`	136	`}`
137		137
138		138
139	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	139	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
140	`unsigned short x, y, msglen, i;`	140	`unsigned short x, y, msglen, i;`
141	`msglen = strlen(msg);`	141	`msglen = strlen(msg);`
142	`y = (screenh - 4) >> 1;`	142	`y = (screenh - 4) >> 1;`
143	`x = (screenw - msglen - 4) >> 1;`	143	`x = (screenw - msglen - 4) >> 1;`
144	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);`	144	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);`
145	`mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);`	145	`mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);`
146		146
147	`if (uidirtyfrom > y) uidirtyfrom = y;`	147	`if (uidirtyfrom > y) uidirtyfrom = y;`
148	`if (uidirtyto < y+2) uidirtyto = y+2;`	148	`if (uidirtyto < y+2) uidirtyto = y+2;`
149	`}`	149	`}`
150		150
151		151
152	`static void ui_help(unsigned char screenw) {`	152	`static void ui_help(unsigned char screenw) {`
153	`#define MAXLINLEN 35`	153	`#define MAXLINLEN 35`
154	`unsigned short i, offset;`	154	`unsigned short i, offset;`
155	`offset = (screenw - MAXLINLEN + 1) >> 1;`	155	`offset = (screenw - MAXLINLEN + 1) >> 1;`
156	`mdr_cout_cursor_hide();`	156	`mdr_cout_cursor_hide();`
157	`for (i = 2; i <= 12; i++) {`	157	`for (i = 2; i <= 12; i++) {`
158	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`	158	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`
159	`}`	159	`}`
160		160
161	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	161	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
162	`for (i = 0; i <= 2; i++) {`	162	`for (i = 0; i <= 2; i++) {`
163	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	163	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
164	`}`	164	`}`
165	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	165	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
166	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	166	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
167		167
168	`keyb_getkey();`	168	`keyb_getkey();`
169	`mdr_cout_cursor_show();`	169	`mdr_cout_cursor_show();`
170	`#undef MAXLINLEN`	170	`#undef MAXLINLEN`
171	`}`	171	`}`
172		172
173		173
174	`static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	174	`static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
175	`unsigned char len;`	175	`unsigned char x;`
176	`const struct line far *l;`	176	`const struct line far *l;`
177	`unsigned char y = db->cursorposy;`	177	`unsigned char y = db->cursorposy;`
178		178
179	`#ifdef DBG_REFRESH`	179	`#ifdef DBG_REFRESH`
180	`static char m = 'a';`	180	`static char m = 'a';`
181	`m++;`	181	`m++;`
182	`if (m > 'z') m = 'a';`	182	`if (m > 'z') m = 'a';`
183	`#endif`	183	`#endif`
184		184
185	`/* rewind cursor line to first line that needs redrawing */`	185	`/* rewind cursor line to first line that needs redrawing */`
186	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`	186	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`
187		187
188	`/* iterate over lines and redraw whatever needs to be redrawn */`	188	`/* iterate over lines and redraw whatever needs to be redrawn */`
189	`for (; l != NULL; l = l->next, y++) {`	189	`for (; l != NULL; l = l->next, y++) {`
190		190
191	`/* skip lines that do not need to be refreshed */`	191	`/* skip lines that do not need to be refreshed */`
192	`if (y < uidirtyfrom) continue;`	192	`if (y < uidirtyfrom) continue;`
193	`if (y > uidirtyto) break;`	193	`if (y > uidirtyto) break;`
194		194
-		195	`x = 0;`
195	`if (db->xoffset < l->len) {`	196	`if (db->xoffset < l->len) {`
-		197	`unsigned char i, limit;`
196	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`	198	`if (l->len - db->xoffset < screenw) {`
-		199	`limit = l->len;`
197	`} else {`	200	`} else {`
-		201	`limit = db->xoffset + screenw - 1;`
198	`len = 0;`	202	`}`
-		203	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`
199	`}`	204	`}`
-		205
-		206	`/* write empty spaces until end of line */`
200	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`	207	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`
201		208
202	`#ifdef DBG_REFRESH`	209	`#ifdef DBG_REFRESH`
203	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	210	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
204	`#endif`	211	`#endif`
205		212
206	`if (y == screenh - 2) break;`	213	`if (y == screenh - 2) break;`
207	`}`	214	`}`
208		215
-		216	`while (y < screenh - 1) {`
-		217	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`
-		218	`}`
209	`}`	219	`}`
210		220
211		221
212	`static void check_cursor_not_after_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	222	`static void check_cursor_not_after_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
213	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	223	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
214		224
215	`if (db->cursor->len < db->xoffset) {`	225	`if (db->cursor->len < db->xoffset) {`
216	`db->cursorposx = 0;`	226	`db->cursorposx = 0;`
217	`db->xoffset = db->cursor->len;`	227	`db->xoffset = db->cursor->len;`
218	`*uidirtyfrom = 0;`	228	`*uidirtyfrom = 0;`
219	`*uidirtyto = 0xff;`	229	`*uidirtyto = 0xff;`
220	`} else {`	230	`} else {`
221	`db->cursorposx = db->cursor->len - db->xoffset;`	231	`db->cursorposx = db->cursor->len - db->xoffset;`
222	`}`	232	`}`
223	`}`	233	`}`
224		234
225		235
226	`static void cursor_up(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	236	`static void cursor_up(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
227	`if (db->cursor->prev != NULL) {`	237	`if (db->cursor->prev != NULL) {`
228	`db->cursor = db->cursor->prev;`	238	`db->cursor = db->cursor->prev;`
229	`if (db->cursorposy == 0) {`	239	`if (db->cursorposy == 0) {`
230	`*uidirtyfrom = 0;`	240	`*uidirtyfrom = 0;`
231	`*uidirtyto = 0xff;`	241	`*uidirtyto = 0xff;`
232	`} else {`	242	`} else {`
233	`db->cursorposy -= 1;`	243	`db->cursorposy -= 1;`
234	`}`	244	`}`
235	`}`	245	`}`
236	`}`	246	`}`
237		247
238		248
239	`static void cursor_eol(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	249	`static void cursor_eol(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
240	`/* adjust xoffset to make sure eol is visible on screen */`	250	`/* adjust xoffset to make sure eol is visible on screen */`
241	`if (db->xoffset > db->cursor->len) {`	251	`if (db->xoffset > db->cursor->len) {`
242	`db->xoffset = db->cursor->len - 1;`	252	`db->xoffset = db->cursor->len - 1;`
243	`*uidirtyfrom = 0;`	253	`*uidirtyfrom = 0;`
244	`*uidirtyto = 0xff;`	254	`*uidirtyto = 0xff;`
245	`}`	255	`}`
246		256
247	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	257	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
248	`db->xoffset = db->cursor->len - screenw + 2;`	258	`db->xoffset = db->cursor->len - screenw + 2;`
249	`*uidirtyfrom = 0;`	259	`*uidirtyfrom = 0;`
250	`*uidirtyto = 0xff;`	260	`*uidirtyto = 0xff;`
251	`}`	261	`}`
252	`db->cursorposx = db->cursor->len - db->xoffset;`	262	`db->cursorposx = db->cursor->len - db->xoffset;`
253	`}`	263	`}`
254		264
255		265
256	`static void cursor_down(struct file db, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	266	`static void cursor_down(struct file db, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
257	`if (db->cursor->next != NULL) {`	267	`if (db->cursor->next != NULL) {`
258	`db->cursor = db->cursor->next;`	268	`db->cursor = db->cursor->next;`
259	`if (db->cursorposy < screenh - 2) {`	269	`if (db->cursorposy < screenh - 2) {`
260	`db->cursorposy += 1;`	270	`db->cursorposy += 1;`
261	`} else {`	271	`} else {`
262	`*uidirtyfrom = 0;`	272	`*uidirtyfrom = 0;`
263	`*uidirtyto = 0xff;`	273	`*uidirtyto = 0xff;`
264	`}`	274	`}`
265	`}`	275	`}`
266	`}`	276	`}`
267		277
268		278
269	`static void cursor_left(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	279	`static void cursor_left(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
270	`if (db->cursorposx > 0) {`	280	`if (db->cursorposx > 0) {`
271	`db->cursorposx -= 1;`	281	`db->cursorposx -= 1;`
272	`} else if (db->xoffset > 0) {`	282	`} else if (db->xoffset > 0) {`
273	`db->xoffset -= 1;`	283	`db->xoffset -= 1;`
274	`*uidirtyfrom = 0;`	284	`*uidirtyfrom = 0;`
275	`*uidirtyto = 0xff;`	285	`*uidirtyto = 0xff;`
276	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	286	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
277	`cursor_up(db, uidirtyfrom, uidirtyto);`	287	`cursor_up(db, uidirtyfrom, uidirtyto);`
278	`cursor_eol(db, screenw, uidirtyfrom, uidirtyto);`	288	`cursor_eol(db, screenw, uidirtyfrom, uidirtyto);`
279	`}`	289	`}`
280	`}`	290	`}`
281		291
282		292
283	`static void cursor_home(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	293	`static void cursor_home(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
284	`db->cursorposx = 0;`	294	`db->cursorposx = 0;`
285	`if (db->xoffset != 0) {`	295	`if (db->xoffset != 0) {`
286	`db->xoffset = 0;`	296	`db->xoffset = 0;`
287	`*uidirtyfrom = 0;`	297	`*uidirtyfrom = 0;`
288	`*uidirtyto = 0xff;`	298	`*uidirtyto = 0xff;`
289	`}`	299	`}`
290	`}`	300	`}`
291		301
292		302
293	`static void cursor_right(struct file db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	303	`static void cursor_right(struct file db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
294	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	304	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
295	`if (db->cursorposx < screenw - 2) {`	305	`if (db->cursorposx < screenw - 2) {`
296	`db->cursorposx += 1;`	306	`db->cursorposx += 1;`
297	`} else {`	307	`} else {`
298	`db->xoffset += 1;`	308	`db->xoffset += 1;`
299	`*uidirtyfrom = 0;`	309	`*uidirtyfrom = 0;`
300	`*uidirtyto = 0xff;`	310	`*uidirtyto = 0xff;`
301	`}`	311	`}`
302	`} else {`	312	`} else {`
303	`cursor_down(db, screenh, uidirtyfrom, uidirtyto);`	313	`cursor_down(db, screenh, uidirtyfrom, uidirtyto);`
304	`cursor_home(db, uidirtyfrom, uidirtyto);`	314	`cursor_home(db, uidirtyfrom, uidirtyto);`
305	`}`	315	`}`
306	`}`	316	`}`
307		317
308		318
309	`static void del(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	319	`static void del(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
310	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	320	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
311	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	321	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
312	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	322	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
313	`*uidirtyfrom = db->cursorposy;`	323	`*uidirtyfrom = db->cursorposy;`
314	`*uidirtyto = db->cursorposy;`	324	`*uidirtyto = db->cursorposy;`
315	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	325	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
316	`struct line far *nextline = db->cursor->next;`	326	`struct line far *nextline = db->cursor->next;`
317	`if (db->cursor->next->len > 0) {`	327	`if (db->cursor->next->len > 0) {`
318	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	328	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
319	`if (newptr != NULL) {`	329	`if (newptr != NULL) {`
320	`db->cursor = newptr;`	330	`db->cursor = newptr;`
321	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	331	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
322	`db->cursor->len += db->cursor->next->len;`	332	`db->cursor->len += db->cursor->next->len;`
323	`}`	333	`}`
324	`}`	334	`}`
325	`db->cursor->next = db->cursor->next->next;`	335	`db->cursor->next = db->cursor->next->next;`
326	`db->cursor->next->prev = db->cursor;`	336	`db->cursor->next->prev = db->cursor;`
327	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	337	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
328	`_ffree(nextline);`	338	`_ffree(nextline);`
329	`*uidirtyfrom = db->cursorposy;`	339	`*uidirtyfrom = db->cursorposy;`
330	`*uidirtyto = 0xff;`	340	`*uidirtyto = 0xff;`
331	`}`	341	`}`
332	`}`	342	`}`
333		343
334		344
335	`static void bkspc(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	345	`static void bkspc(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
336		346
337	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	347	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
338	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	348	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
339		349
340	`cursor_left(db, screenw, uidirtyfrom, uidirtyto);`	350	`cursor_left(db, screenw, uidirtyfrom, uidirtyto);`
341	`del(db, uidirtyfrom, uidirtyto);`	351	`del(db, uidirtyfrom, uidirtyto);`
342	`}`	352	`}`
343		353
344		354
345	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	355	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
346	`* of argc and argv, saves some 330 bytes of binary size */`	356	`* of argc and argv, saves some 330 bytes of binary size */`
347	`static char *parseargv(void) {`	357	`static char *parseargv(void) {`
348	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	358	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
349	`unsigned char count = 0;`	359	`unsigned char count = 0;`
350	`char *argv[4];`	360	`char *argv[4];`
351		361
352	`while (count < 4) {`	362	`while (count < 4) {`
353	`/* jump to nearest arg */`	363	`/* jump to nearest arg */`
354	`while (*tail == ' ') {`	364	`while (*tail == ' ') {`
355	`*tail = 0;`	365	`*tail = 0;`
356	`tail++;`	366	`tail++;`
357	`}`	367	`}`
358		368
359	`if (*tail == '\r') {`	369	`if (*tail == '\r') {`
360	`*tail = 0;`	370	`*tail = 0;`
361	`break;`	371	`break;`
362	`}`	372	`}`
363		373
364	`argv[count++] = tail;`	374	`argv[count++] = tail;`
365		375
366	`/* jump to next delimiter */`	376	`/* jump to next delimiter */`
367	`while ((tail != ' ') && (tail != '\r')) tail++;`	377	`while ((tail != ' ') && (tail != '\r')) tail++;`
368	`}`	378	`}`
369		379
370	`/* check args now */`	380	`/* check args now */`
371	`if (count != 1) return(NULL);`	381	`if (count != 1) return(NULL);`
372		382
373	`return(argv[0]);`	383	`return(argv[0]);`
374	`}`	384	`}`
375		385
376		386
377	`static int loadfile(struct file db, const char fname) {`	387	`static int loadfile(struct file db, const char fname) {`
378	`char buff[1024];`	388	`char buff[1024];`
379	`unsigned int prevlen = 0, len, llen;`	389	`unsigned int prevlen = 0, len, llen;`
380	`int fd;`	390	`int fd;`
381	`int r = 0;`	391	`int r = 0;`
382		392
383	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	393	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
384	`mdr_coutraw_puts("Failed to open file:");`	394	`mdr_coutraw_puts("Failed to open file:");`
385	`mdr_coutraw_puts(fname);`	395	`mdr_coutraw_puts(fname);`
386	`return(-1);`	396	`return(-1);`
387	`}`	397	`}`
388		398
389	`db->lfonly = 1;`	399	`db->lfonly = 1;`
390		400
391	`do {`	401	`do {`
392	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`	402	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`
393	`len += prevlen;`	403	`len += prevlen;`
394	`} else {`	404	`} else {`
395	`len = prevlen;`	405	`len = prevlen;`
396	`}`	406	`}`
397		407
398	`/* look for nearest \n and replace with 0*/`	408	`/* look for nearest \n and replace with 0*/`
399	`for (llen = 0; buff[llen] != '\n'; llen++) {`	409	`for (llen = 0; buff[llen] != '\n'; llen++) {`
400	`if (llen == sizeof(buff)) break;`	410	`if (llen == sizeof(buff)) break;`
401	`}`	411	`}`
402	`buff[llen] = 0;`	412	`buff[llen] = 0;`
403	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`	413	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`
404	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`	414	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`
405	`db->lfonly = 0;`	415	`db->lfonly = 0;`
406	`}`	416	`}`
407	`if (line_add(db, buff) != 0) {`	417	`if (line_add(db, buff) != 0) {`
408	`mdr_coutraw_puts("out of memory");`	418	`mdr_coutraw_puts("out of memory");`
409	`r = -1;`	419	`r = -1;`
410	`break;`	420	`break;`
411	`}`	421	`}`
412		422
413	`len -= llen + 1;`	423	`len -= llen + 1;`
414	`memmove(buff, buff + llen + 1, len);`	424	`memmove(buff, buff + llen + 1, len);`
415	`prevlen = len;`	425	`prevlen = len;`
416	`} while (len > 0);`	426	`} while (len > 0);`
417		427
418	`_dos_close(fd);`	428	`_dos_close(fd);`
419		429
420	`return(r);`	430	`return(r);`
421	`}`	431	`}`
422		432
423		433
424	`static int savefile(const struct file db, const char fname) {`	434	`static int savefile(const struct file db, const char fname) {`
425	`int fd;`	435	`int fd;`
426	`const struct line far *l;`	436	`const struct line far *l;`
427	`unsigned bytes;`	437	`unsigned bytes;`
428	`unsigned char eollen;`	438	`unsigned char eollen;`
429	`unsigned char eolbuf[2];`	439	`unsigned char eolbuf[2];`
430		440
431	`if (_dos_open(fname, O_WRONLY, &fd) != 0) {`	441	`if (_dos_open(fname, O_WRONLY, &fd) != 0) {`
432	`return(-1);`	442	`return(-1);`
433	`}`	443	`}`
434		444
435	`l = db->cursor;`	445	`l = db->cursor;`
436	`while (l->prev) l = l->prev;`	446	`while (l->prev) l = l->prev;`
437		447
438	`/* preset line terminators */`	448	`/* preset line terminators */`
439	`if (db->lfonly) {`	449	`if (db->lfonly) {`
440	`eolbuf[0] = '\n';`	450	`eolbuf[0] = '\n';`
441	`eollen = 1;`	451	`eollen = 1;`
442	`} else {`	452	`} else {`
443	`eolbuf[0] = '\r';`	453	`eolbuf[0] = '\r';`
444	`eolbuf[1] = '\n';`	454	`eolbuf[1] = '\n';`
445	`eollen = 2;`	455	`eollen = 2;`
446	`}`	456	`}`
447		457
448	`while (l) {`	458	`while (l) {`
449	`_dos_write(fd, l->payload, l->len, &bytes);`	459	`_dos_write(fd, l->payload, l->len, &bytes);`
450	`_dos_write(fd, eolbuf, eollen, &bytes);`	460	`_dos_write(fd, eolbuf, eollen, &bytes);`
451	`l = l->next;`	461	`l = l->next;`
452	`}`	462	`}`
453		463
454	`_dos_close(fd);`	464	`_dos_close(fd);`
455	`return(0);`	465	`return(0);`
456	`}`	466	`}`
457		467
458		468
459	`static void insert_in_line(struct file db, const char databuf, unsigned short len, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	469	`static void insert_in_line(struct file db, const char databuf, unsigned short len, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
460	`struct line far *n;`	470	`struct line far *n;`
461	`n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);`	471	`n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);`
462	`if (n != NULL) {`	472	`if (n != NULL) {`
463	`unsigned short off = db->xoffset + db->cursorposx;`	473	`unsigned short off = db->xoffset + db->cursorposx;`
464	`if (n->prev) n->prev->next = n;`	474	`if (n->prev) n->prev->next = n;`
465	`if (n->next) n->next->prev = n;`	475	`if (n->next) n->next->prev = n;`
466	`db->cursor = n;`	476	`db->cursor = n;`
467	`_fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);`	477	`_fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);`
468	`db->cursor->len += len;`	478	`db->cursor->len += len;`
469	`*uidirtyfrom = db->cursorposy;`	479	`*uidirtyfrom = db->cursorposy;`
470	`*uidirtyto = db->cursorposy;`	480	`*uidirtyto = db->cursorposy;`
471	`while (len--) {`	481	`while (len--) {`
472	`db->cursor->payload[off++] = *databuf;`	482	`db->cursor->payload[off++] = *databuf;`
473	`databuf++;`	483	`databuf++;`
474	`cursor_right(db, screenw, screenh, uidirtyfrom, uidirtyto);`	484	`cursor_right(db, screenw, screenh, uidirtyfrom, uidirtyto);`
475	`}`	485	`}`
476	`}`	486	`}`
477	`}`	487	`}`
478		488
479		489
480	`int main(void) {`	490	`int main(void) {`
481	`const char *fname;`	491	`const char *fname;`
482	`struct file db;`	492	`struct file db;`
483	`unsigned char screenw = 0, screenh = 0;`	493	`unsigned char screenw = 0, screenh = 0;`
484	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`	494	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`
485		495
486	`bzero(&db, sizeof(db));`	496	`bzero(&db, sizeof(db));`
487		497
488	`{`	498	`{`
489	`char nlspath[128], lang[8];`	499	`char nlspath[128], lang[8];`
490	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`	500	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1425 – Rev 1317 → 1318