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;
  char lfonly; /* set if line endings are LF (CR/LF otherwise) */
};
 
 
/* 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, const struct linedb *db) {
  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]);
 
  /* 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 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);
  }
 
  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 linedb *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);
}
 
 
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);
 
  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 1312	Rev 1313
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 linedb {`	56	`struct linedb {`
57	`struct line far *cursor;`	57	`struct line far *cursor;`
58	`unsigned short xoffset;`	58	`unsigned short xoffset;`
-		59	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
59	`};`	60	`};`
60		61
61		62
62	`/* returns non-zero on error */`	63	`/* returns non-zero on error */`
63	`static int line_add(struct linedb db, const char far line) {`	64	`static int line_add(struct linedb db, const char far line) {`
64	`unsigned short slen;`	65	`unsigned short slen;`
65	`struct line far *l;`	66	`struct line far *l;`
66		67
67	`/* slen = strlen(line) (but for far pointer) */`	68	`/* slen = strlen(line) (but for far pointer) */`
68	`for (slen = 0; line[slen] != 0; slen++);`	69	`for (slen = 0; line[slen] != 0; slen++);`
69		70
70	`/* trim out CR/LF line endings */`	71	`/* trim out CR/LF line endings */`
71	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	72	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
72	`slen -= 2;`	73	`slen -= 2;`
73	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	74	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
74	`slen--;`	75	`slen--;`
75	`}`	76	`}`
76		77
77	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	78	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
78	`if (l == NULL) return(-1);`	79	`if (l == NULL) return(-1);`
79		80
80	`l->prev = db->cursor;`	81	`l->prev = db->cursor;`
81	`if (db->cursor) {`	82	`if (db->cursor) {`
82	`l->next = db->cursor->next;`	83	`l->next = db->cursor->next;`
83	`db->cursor->next = l;`	84	`db->cursor->next = l;`
84	`l->next->prev = l;`	85	`l->next->prev = l;`
85	`}`	86	`}`
86	`db->cursor = l;`	87	`db->cursor = l;`
87	`_fmemcpy(l->payload, line, slen);`	88	`_fmemcpy(l->payload, line, slen);`
88	`l->len = slen;`	89	`l->len = slen;`
89		90
90	`return(0);`	91	`return(0);`
91	`}`	92	`}`
92		93
93		94
94	`static void db_rewind(struct linedb *db) {`	95	`static void db_rewind(struct linedb *db) {`
95	`if (db->cursor == NULL) return;`	96	`if (db->cursor == NULL) return;`
96	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	97	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
97	`}`	98	`}`
98		99
99		100
100	`static void load_colorscheme(void) {`	101	`static void load_colorscheme(void) {`
101	`scheme[COL_TXT] = 0x17;`	102	`scheme[COL_TXT] = 0x17;`
102	`scheme[COL_STATUSBAR1] = 0x70;`	103	`scheme[COL_STATUSBAR1] = 0x70;`
103	`scheme[COL_STATUSBAR2] = 0x78;`	104	`scheme[COL_STATUSBAR2] = 0x78;`
104	`scheme[COL_SCROLLBAR] = 0x70;`	105	`scheme[COL_SCROLLBAR] = 0x70;`
105	`}`	106	`}`
106		107
107		108
108	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {`	109	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char fname, const struct linedb db) {`
109	`unsigned char i;`	110	`unsigned char i;`
110	`const char s = svarlang_strid(0); / HELP */`	111	`const char s = svarlang_strid(0); / HELP */`
111	`unsigned char helpcol = screenw - (strlen(s) + 4);`	112	`unsigned char helpcol = screenw - (strlen(s) + 4);`
112		113
113	`/* clear screen */`	114	`/* clear screen */`
114	`mdr_cout_cls(scheme[COL_TXT]);`	115	`mdr_cout_cls(scheme[COL_TXT]);`
115		116
116	`/* status bar */`	117	`/* fill status bar with background */`
-		118	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`
-		119
117	`for (i = 0; i < helpcol; i++) {`	120	`/* filename */`
118	`mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);`	121	`mdr_cout_str(screenh - 1, 0, fname, scheme[COL_STATUSBAR1], screenw);`
-		122
-		123	`/* eol type */`
119	`if (*fname != 0) fname++;`	124	`if (db->lfonly) {`
-		125	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`
-		126	`} else {`
-		127	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`
120	`}`	128	`}`
-		129
121	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	130	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
122	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	131	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
123		132
124	`/* scroll bar */`	133	`/* scroll bar */`
125	`for (i = 0; i < (screenh - 1); i++) {`	134	`for (i = 0; i < (screenh - 1); i++) {`
126	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	135	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
127	`}`	136	`}`
128	`}`	137	`}`
129		138
130		139
131	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	140	`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;`	141	`unsigned short x, y, msglen, i;`
133	`msglen = strlen(msg);`	142	`msglen = strlen(msg);`
134	`y = (screenh - 4) >> 1;`	143	`y = (screenh - 4) >> 1;`
135	`x = (screenw - msglen - 4) >> 1;`	144	`x = (screenw - msglen - 4) >> 1;`
136	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);`	145	`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);`	146	`mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);`
138		147
139	`if (uidirtyfrom > y) uidirtyfrom = y;`	148	`if (uidirtyfrom > y) uidirtyfrom = y;`
140	`if (uidirtyto < y+2) uidirtyto = y+2;`	149	`if (uidirtyto < y+2) uidirtyto = y+2;`
141	`}`	150	`}`
142		151
143		152
144	`static void ui_help(unsigned char screenw) {`	153	`static void ui_help(unsigned char screenw) {`
145	`#define MAXLINLEN 35`	154	`#define MAXLINLEN 35`
146	`unsigned short i, offset;`	155	`unsigned short i, offset;`
147	`offset = (screenw - MAXLINLEN + 1) >> 1;`	156	`offset = (screenw - MAXLINLEN + 1) >> 1;`
148	`mdr_cout_cursor_hide();`	157	`mdr_cout_cursor_hide();`
149	`for (i = 2; i <= 12; i++) {`	158	`for (i = 2; i <= 12; i++) {`
150	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`	159	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`
151	`}`	160	`}`
152		161
153	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	162	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
154	`for (i = 0; i <= 2; i++) {`	163	`for (i = 0; i <= 2; i++) {`
155	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	164	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
156	`}`	165	`}`
157	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	166	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
158	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	167	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
159		168
160	`keyb_getkey();`	169	`keyb_getkey();`
161	`mdr_cout_cursor_show();`	170	`mdr_cout_cursor_show();`
162	`#undef MAXLINLEN`	171	`#undef MAXLINLEN`
163	`}`	172	`}`
164		173
165		174
166	`static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto, unsigned char y) {`	175	`static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto, unsigned char y) {`
167	`unsigned char len;`	176	`unsigned char len;`
168	`const struct line far *l;`	177	`const struct line far *l;`
169		178
170	`#ifdef DBG_REFRESH`	179	`#ifdef DBG_REFRESH`
171	`static char m = 'a';`	180	`static char m = 'a';`
172	`m++;`	181	`m++;`
173	`if (m > 'z') m = 'a';`	182	`if (m > 'z') m = 'a';`
174	`#endif`	183	`#endif`
175		184
176	`/* rewind cursor line to first line that needs redrawing */`	185	`/* rewind cursor line to first line that needs redrawing */`
177	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`	186	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`
178		187
179	`/* iterate over lines and redraw whatever needs to be redrawn */`	188	`/* iterate over lines and redraw whatever needs to be redrawn */`
180	`for (; l != NULL; l = l->next, y++) {`	189	`for (; l != NULL; l = l->next, y++) {`
181		190
182	`/* skip lines that do not need to be refreshed */`	191	`/* skip lines that do not need to be refreshed */`
183	`if (y < uidirtyfrom) continue;`	192	`if (y < uidirtyfrom) continue;`
184	`if (y > uidirtyto) break;`	193	`if (y > uidirtyto) break;`
185		194
186	`if (db->xoffset < l->len) {`	195	`if (db->xoffset < l->len) {`
187	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`	196	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`
188	`} else {`	197	`} else {`
189	`len = 0;`	198	`len = 0;`
190	`}`	199	`}`
191	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`	200	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`
192		201
193	`#ifdef DBG_REFRESH`	202	`#ifdef DBG_REFRESH`
194	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	203	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
195	`#endif`	204	`#endif`
196		205
197	`if (y == screenh - 2) break;`	206	`if (y == screenh - 2) break;`
198	`}`	207	`}`
199		208
200	`}`	209	`}`
201		210
202		211
203	`static void check_cursor_not_after_eol(struct linedb db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	212	`static void check_cursor_not_after_eol(struct linedb db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
204	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`	213	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`
205		214
206	`if (db->cursor->len < db->xoffset) {`	215	`if (db->cursor->len < db->xoffset) {`
207	`*cursorpos = 0;`	216	`*cursorpos = 0;`
208	`db->xoffset = db->cursor->len;`	217	`db->xoffset = db->cursor->len;`
209	`*uidirtyfrom = 0;`	218	`*uidirtyfrom = 0;`
210	`*uidirtyto = 0xff;`	219	`*uidirtyto = 0xff;`
211	`} else {`	220	`} else {`
212	`*cursorpos = db->cursor->len - db->xoffset;`	221	`*cursorpos = db->cursor->len - db->xoffset;`
213	`}`	222	`}`
214	`}`	223	`}`
215		224
216		225
217	`static void cursor_up(struct linedb db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	226	`static void cursor_up(struct linedb db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
218	`if (db->cursor->prev != NULL) {`	227	`if (db->cursor->prev != NULL) {`
219	`db->cursor = db->cursor->prev;`	228	`db->cursor = db->cursor->prev;`
220	`if (*cursorposy == 0) {`	229	`if (*cursorposy == 0) {`
221	`*uidirtyfrom = 0;`	230	`*uidirtyfrom = 0;`
222	`*uidirtyto = 0xff;`	231	`*uidirtyto = 0xff;`
223	`} else {`	232	`} else {`
224	`*cursorposy -= 1;`	233	`*cursorposy -= 1;`
225	`}`	234	`}`
226	`}`	235	`}`
227	`}`	236	`}`
228		237
229		238
230	`static void cursor_eol(struct linedb db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	239	`static void cursor_eol(struct linedb db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
231	`/* adjust xoffset to make sure eol is visible on screen */`	240	`/* adjust xoffset to make sure eol is visible on screen */`
232	`if (db->xoffset > db->cursor->len) {`	241	`if (db->xoffset > db->cursor->len) {`
233	`db->xoffset = db->cursor->len - 1;`	242	`db->xoffset = db->cursor->len - 1;`
234	`*uidirtyfrom = 0;`	243	`*uidirtyfrom = 0;`
235	`*uidirtyto = 0xff;`	244	`*uidirtyto = 0xff;`
236	`}`	245	`}`
237		246
238	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	247	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
239	`db->xoffset = db->cursor->len - screenw + 2;`	248	`db->xoffset = db->cursor->len - screenw + 2;`
240	`*uidirtyfrom = 0;`	249	`*uidirtyfrom = 0;`
241	`*uidirtyto = 0xff;`	250	`*uidirtyto = 0xff;`
242	`}`	251	`}`
243	`*cursorposx = db->cursor->len - db->xoffset;`	252	`*cursorposx = db->cursor->len - db->xoffset;`
244	`}`	253	`}`
245		254
246		255
247	`static void cursor_down(struct linedb db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	256	`static void cursor_down(struct linedb db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
248	`if (db->cursor->next != NULL) {`	257	`if (db->cursor->next != NULL) {`
249	`db->cursor = db->cursor->next;`	258	`db->cursor = db->cursor->next;`
250	`if (*cursorposy < screenh - 2) {`	259	`if (*cursorposy < screenh - 2) {`
251	`*cursorposy += 1;`	260	`*cursorposy += 1;`
252	`} else {`	261	`} else {`
253	`*uidirtyfrom = 0;`	262	`*uidirtyfrom = 0;`
254	`*uidirtyto = 0xff;`	263	`*uidirtyto = 0xff;`
255	`}`	264	`}`
256	`}`	265	`}`
257	`}`	266	`}`
258		267
259		268
260	`static void cursor_left(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	269	`static void cursor_left(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
261	`if (*cursorposx > 0) {`	270	`if (*cursorposx > 0) {`
262	`*cursorposx -= 1;`	271	`*cursorposx -= 1;`
263	`} else if (db->xoffset > 0) {`	272	`} else if (db->xoffset > 0) {`
264	`db->xoffset -= 1;`	273	`db->xoffset -= 1;`
265	`*uidirtyfrom = 0;`	274	`*uidirtyfrom = 0;`
266	`*uidirtyto = 0xff;`	275	`*uidirtyto = 0xff;`
267	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	276	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
268	`cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);`	277	`cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);`
269	`cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);`	278	`cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);`
270	`}`	279	`}`
271	`}`	280	`}`
272		281
273		282
274	`static void cursor_home(struct linedb db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	283	`static void cursor_home(struct linedb db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
275	`*cursorposx = 0;`	284	`*cursorposx = 0;`
276	`if (db->xoffset != 0) {`	285	`if (db->xoffset != 0) {`
277	`db->xoffset = 0;`	286	`db->xoffset = 0;`
278	`*uidirtyfrom = 0;`	287	`*uidirtyfrom = 0;`
279	`*uidirtyto = 0xff;`	288	`*uidirtyto = 0xff;`
280	`}`	289	`}`
281	`}`	290	`}`
282		291
283		292
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) {`	293	`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) {`
285	`if (db->cursor->len > db->xoffset + *cursorposx) {`	294	`if (db->cursor->len > db->xoffset + *cursorposx) {`
286	`if (*cursorposx < screenw - 2) {`	295	`if (*cursorposx < screenw - 2) {`
287	`*cursorposx += 1;`	296	`*cursorposx += 1;`
288	`} else {`	297	`} else {`
289	`db->xoffset += 1;`	298	`db->xoffset += 1;`
290	`*uidirtyfrom = 0;`	299	`*uidirtyfrom = 0;`
291	`*uidirtyto = 0xff;`	300	`*uidirtyto = 0xff;`
292	`}`	301	`}`
293	`} else {`	302	`} else {`
294	`cursor_down(db, cursorposy, screenh, uidirtyfrom, uidirtyto);`	303	`cursor_down(db, cursorposy, screenh, uidirtyfrom, uidirtyto);`
295	`cursor_home(db, cursorposx, uidirtyfrom, uidirtyto);`	304	`cursor_home(db, cursorposx, uidirtyfrom, uidirtyto);`
296	`}`	305	`}`
297	`}`	306	`}`
298		307
299		308
300	`static void del(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	309	`static void del(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
301	`if (cursorposx + db->xoffset < db->cursor->len) {`	310	`if (cursorposx + db->xoffset < db->cursor->len) {`
302	`_fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);`	311	`_fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);`
303	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	312	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
304	`*uidirtyfrom = cursorposy;`	313	`*uidirtyfrom = cursorposy;`
305	`*uidirtyto = cursorposy;`	314	`*uidirtyto = cursorposy;`
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) */`	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) */`
307	`struct line far *nextline = db->cursor->next;`	316	`struct line far *nextline = db->cursor->next;`
308	`if (db->cursor->next->len > 0) {`	317	`if (db->cursor->next->len > 0) {`
309	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	318	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
310	`if (newptr != NULL) {`	319	`if (newptr != NULL) {`
311	`db->cursor = newptr;`	320	`db->cursor = newptr;`
312	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	321	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
313	`db->cursor->len += db->cursor->next->len;`	322	`db->cursor->len += db->cursor->next->len;`
314	`}`	323	`}`
315	`}`	324	`}`
316	`db->cursor->next = db->cursor->next->next;`	325	`db->cursor->next = db->cursor->next->next;`
317	`db->cursor->next->prev = db->cursor;`	326	`db->cursor->next->prev = db->cursor;`
318	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	327	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
319	`_ffree(nextline);`	328	`_ffree(nextline);`
320	`*uidirtyfrom = cursorposy;`	329	`*uidirtyfrom = cursorposy;`
321	`*uidirtyto = 0xff;`	330	`*uidirtyto = 0xff;`
322	`}`	331	`}`
323	`}`	332	`}`
324		333
325		334
326	`static void bkspc(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	335	`static void bkspc(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
327		336
328	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	337	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
329	`if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	338	`if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
330		339
331	`cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);`	340	`cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);`
332	`del(db, cursorposx, cursorposy, uidirtyfrom, uidirtyto);`	341	`del(db, cursorposx, cursorposy, uidirtyfrom, uidirtyto);`
333	`}`	342	`}`
334		343
335		344
336	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	345	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
337	`* of argc and argv, saves some 330 bytes of binary size */`	346	`* of argc and argv, saves some 330 bytes of binary size */`
338	`static char *parseargv(void) {`	347	`static char *parseargv(void) {`
339	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	348	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
340	`unsigned char count = 0;`	349	`unsigned char count = 0;`
341	`char *argv[4];`	350	`char *argv[4];`
342		351
343	`while (count < 4) {`	352	`while (count < 4) {`
344	`/* jump to nearest arg */`	353	`/* jump to nearest arg */`
345	`while (*tail == ' ') {`	354	`while (*tail == ' ') {`
346	`*tail = 0;`	355	`*tail = 0;`
347	`tail++;`	356	`tail++;`
348	`}`	357	`}`
349		358
350	`if (*tail == '\r') {`	359	`if (*tail == '\r') {`
351	`*tail = 0;`	360	`*tail = 0;`
352	`break;`	361	`break;`
353	`}`	362	`}`
354		363
355	`argv[count++] = tail;`	364	`argv[count++] = tail;`
356		365
357	`/* jump to next delimiter */`	366	`/* jump to next delimiter */`
358	`while ((tail != ' ') && (tail != '\r')) tail++;`	367	`while ((tail != ' ') && (tail != '\r')) tail++;`
359	`}`	368	`}`
360		369
361	`/* check args now */`	370	`/* check args now */`
362	`if (count != 1) return(NULL);`	371	`if (count != 1) return(NULL);`
363		372
364	`return(argv[0]);`	373	`return(argv[0]);`
365	`}`	374	`}`
366		375
367		376
368	`static int loadfile(struct linedb db, const char fname) {`	377	`static int loadfile(struct linedb db, const char fname) {`
369	`char buff[1024];`	378	`char buff[1024];`
370	`unsigned int prevlen = 0, len, llen;`	379	`unsigned int prevlen = 0, len, llen;`
371	`int fd;`	380	`int fd;`
372	`int r = 0;`	381	`int r = 0;`
373		382
374	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	383	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
375	`mdr_coutraw_puts("Failed to open file:");`	384	`mdr_coutraw_puts("Failed to open file:");`
376	`mdr_coutraw_puts(fname);`	385	`mdr_coutraw_puts(fname);`
377	`return(-1);`	386	`return(-1);`
378	`}`	387	`}`
379		388
-		389	`db->lfonly = 1;`
-		390
380	`do {`	391	`do {`
381	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`	392	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`
382	`len += prevlen;`	393	`len += prevlen;`
383	`} else {`	394	`} else {`
384	`len = prevlen;`	395	`len = prevlen;`
385	`}`	396	`}`
386		397
387	`/* look for nearest \n and replace with 0*/`	398	`/* look for nearest \n and replace with 0*/`
388	`for (llen = 0; buff[llen] != '\n'; llen++) {`	399	`for (llen = 0; buff[llen] != '\n'; llen++) {`
389	`if (llen == sizeof(buff)) break;`	400	`if (llen == sizeof(buff)) break;`
390	`}`	401	`}`
391	`buff[llen] = 0;`	402	`buff[llen] = 0;`
-		403	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`
392	`if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`	404	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`
-		405	`db->lfonly = 0;`
-		406	`}`
393	`if (line_add(db, buff) != 0) {`	407	`if (line_add(db, buff) != 0) {`
394	`mdr_coutraw_puts("out of memory");`	408	`mdr_coutraw_puts("out of memory");`
395	`r = -1;`	409	`r = -1;`
396	`break;`	410	`break;`
397	`}`	411	`}`
398		412
399	`len -= llen + 1;`	413	`len -= llen + 1;`
400	`memmove(buff, buff + llen + 1, len);`	414	`memmove(buff, buff + llen + 1, len);`
401	`prevlen = len;`	415	`prevlen = len;`
402	`} while (len > 0);`	416	`} while (len > 0);`
403		417
404	`_dos_close(fd);`	418	`_dos_close(fd);`
405		419
406	`return(r);`	420	`return(r);`
407	`}`	421	`}`
408		422
409		423
410	`static int savefile(const struct linedb db, const char fname) {`	424	`static int savefile(const struct linedb db, const char fname) {`
411	`int fd;`	425	`int fd;`
412	`const struct line far *l;`	426	`const struct line far *l;`
413	`unsigned bytes;`	427	`unsigned bytes;`
-		428	`unsigned char eollen;`
-		429	`unsigned char eolbuf[2];`
-		430
414	`if (_dos_open(fname, O_WRONLY, &fd) != 0) {`	431	`if (_dos_open(fname, O_WRONLY, &fd) != 0) {`
415	`return(-1);`	432	`return(-1);`
416	`}`	433	`}`
417		434
418	`l = db->cursor;`	435	`l = db->cursor;`
419	`while (l->prev) l = l->prev;`	436	`while (l->prev) l = l->prev;`
420		437
-		438	`/* preset line terminators */`
-		439	`if (db->lfonly) {`
-		440	`eolbuf[0] = '\n';`
-		441	`eollen = 1;`
-		442	`} else {`
-		443	`eolbuf[0] = '\r';`
-		444	`eolbuf[1] = '\n';`
-		445	`eollen = 2;`
-		446	`}`
-		447
421	`while (l) {`	448	`while (l) {`
422	`_dos_write(fd, l->payload, l->len, &bytes);`	449	`_dos_write(fd, l->payload, l->len, &bytes);`
423	`_dos_write(fd, "\r\n", 2, &bytes);`	450	`_dos_write(fd, eolbuf, eollen, &bytes);`
424	`l = l->next;`	451	`l = l->next;`
425	`}`	452	`}`
426		453
427	`_dos_close(fd);`	454	`_dos_close(fd);`
428	`return(0);`	455	`return(0);`
429	`}`	456	`}`
430		457
431		458
432	`int main(void) {`	459	`int main(void) {`
433	`const char *fname;`	460	`const char *fname;`
434	`struct linedb db;`	461	`struct linedb db;`
435	`unsigned char screenw = 0, screenh = 0;`	462	`unsigned char screenw = 0, screenh = 0;`
436	`unsigned char cursorposx = 0, cursorposy = 0;`	463	`unsigned char cursorposx = 0, cursorposy = 0;`
437	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`	464	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`
438		465
439	`bzero(&db, sizeof(db));`	466	`bzero(&db, sizeof(db));`
440		467
441	`{`	468	`{`
442	`char nlspath[128], lang[8];`	469	`char nlspath[128], lang[8];`
443	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`	470	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`
444	`}`	471	`}`
445		472
446	`fname = parseargv();`	473	`fname = parseargv();`
447		474
448	`if (fname == NULL) {`	475	`if (fname == NULL) {`
449	`mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */`	476	`mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */`
450	`return(0);`	477	`return(0);`
451	`}`	478	`}`
452		479
453	`/* load file */`	480	`/* load file */`
454	`if (loadfile(&db, fname) != 0) return(1);`	481	`if (loadfile(&db, fname) != 0) return(1);`
455		482
456	`/* add an empty line at end if not present already */`	483	`/* add an empty line at end if not present already */`
457	`if (db.cursor->len != 0) line_add(&db, "");`	484	`if (db.cursor->len != 0) line_add(&db, "");`
458		485
459	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`	486	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`
460	`ui_basic(screenw, screenh, fname);`	487	`ui_basic(screenw, screenh, fname, &db);`
461		488
462	`db_rewind(&db);`	489	`db_rewind(&db);`
463		490
464	`for (;;) {`	491	`for (;;) {`
465	`int k;`	492	`int k;`
466		493
467	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	494	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
468	`mdr_cout_locate(cursorposy, cursorposx);`	495	`mdr_cout_locate(cursorposy, cursorposx);`
469		496
470	`if (uidirtyfrom != 0xff) {`	497	`if (uidirtyfrom != 0xff) {`
471	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto, cursorposy);`	498	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto, cursorposy);`
472	`uidirtyfrom = 0xff;`	499	`uidirtyfrom = 0xff;`
473	`}`	500	`}`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1324 – Rev 1312 → 1313