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 {
  int fd;
  struct line far *cursor;
  unsigned short xoffset;
  unsigned char cursorposx;
  unsigned char cursorposy;
  char lfonly; /* set if line endings are LF (CR/LF otherwise) */
  char fname[1]; /* dynamically sized */
};
 
 
/* 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 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, db->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;
  }
 
  /* fill all lines below if empty (and they need to be redrawn) */
  if (l == NULL) {
    while ((y < screenh - 1) && (y < uidirtyto)) {
      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 struct file *loadfile(const char *fname) {
  char buff[1024];
  unsigned int prevlen = 0, len, llen;
  int fd;
  struct file *db;
 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
    mdr_coutraw_puts("Failed to open file:");
    mdr_coutraw_puts(fname);
    return(NULL);
  }
 
  len = strlen(fname) + 1;
  db = calloc(1, sizeof(struct file) + len);
  if (db == NULL) {
    _dos_close(fd);
    return(NULL);
  }
  memcpy(db->fname, fname, len);
 
  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)) { /* TODO line too long: handle it in some classy way */
        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");
      free(db);
      db = NULL;
      break;
    }
 
    len -= llen + 1;
    memmove(buff, buff + llen + 1, len);
    prevlen = len;
  } while (len > 0);
 
  _dos_close(fd);
 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
  if (db != NULL) {
    if (db->cursor->len != 0) line_add(db, "");
    db_rewind(db);
  }
 
  return(db);
}
 
 
static int savefile(const struct file *db) {
  int fd;
  const struct line far *l;
  unsigned bytes;
  unsigned char eollen;
  unsigned char eolbuf[2];
 
  if (_dos_open(db->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 */
 
 
 
  {
    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 */
  db = loadfile(fname);
 
 
  if (db == NULL) return(1);
 
  if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
  ui_basic(screenw, screenh, 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);
      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, 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();
 
  /* no need to free memory, DOS will do it for me */
 
  return(0);
}
 

Rev 1319	Rev 1320
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	`int fd;`
57	`struct line far *cursor;`	58	`struct line far *cursor;`
58	`unsigned short xoffset;`	59	`unsigned short xoffset;`
59	`unsigned char cursorposx;`	60	`unsigned char cursorposx;`
60	`unsigned char cursorposy;`	61	`unsigned char cursorposy;`
61	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	62	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
-		63	`char fname[1]; /* dynamically sized */`
62	`};`	64	`};`
63		65
64		66
65	`/* returns non-zero on error */`	67	`/* returns non-zero on error */`
66	`static int line_add(struct file db, const char far line) {`	68	`static int line_add(struct file db, const char far line) {`
67	`unsigned short slen;`	69	`unsigned short slen;`
68	`struct line far *l;`	70	`struct line far *l;`
69		71
70	`/* slen = strlen(line) (but for far pointer) */`	72	`/* slen = strlen(line) (but for far pointer) */`
71	`for (slen = 0; line[slen] != 0; slen++);`	73	`for (slen = 0; line[slen] != 0; slen++);`
72		74
73	`/* trim out CR/LF line endings */`	75	`/* trim out CR/LF line endings */`
74	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	76	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
75	`slen -= 2;`	77	`slen -= 2;`
76	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	78	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
77	`slen--;`	79	`slen--;`
78	`}`	80	`}`
79		81
80	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	82	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
81	`if (l == NULL) return(-1);`	83	`if (l == NULL) return(-1);`
82		84
83	`l->prev = db->cursor;`	85	`l->prev = db->cursor;`
84	`if (db->cursor) {`	86	`if (db->cursor) {`
85	`l->next = db->cursor->next;`	87	`l->next = db->cursor->next;`
86	`db->cursor->next = l;`	88	`db->cursor->next = l;`
87	`l->next->prev = l;`	89	`l->next->prev = l;`
88	`}`	90	`}`
89	`db->cursor = l;`	91	`db->cursor = l;`
90	`_fmemcpy(l->payload, line, slen);`	92	`_fmemcpy(l->payload, line, slen);`
91	`l->len = slen;`	93	`l->len = slen;`
92		94
93	`return(0);`	95	`return(0);`
94	`}`	96	`}`
95		97
96		98
97	`static void db_rewind(struct file *db) {`	99	`static void db_rewind(struct file *db) {`
98	`if (db->cursor == NULL) return;`	100	`if (db->cursor == NULL) return;`
99	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	101	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
100	`}`	102	`}`
101		103
102		104
103	`static void load_colorscheme(void) {`	105	`static void load_colorscheme(void) {`
104	`scheme[COL_TXT] = 0x17;`	106	`scheme[COL_TXT] = 0x17;`
105	`scheme[COL_STATUSBAR1] = 0x70;`	107	`scheme[COL_STATUSBAR1] = 0x70;`
106	`scheme[COL_STATUSBAR2] = 0x78;`	108	`scheme[COL_STATUSBAR2] = 0x78;`
107	`scheme[COL_SCROLLBAR] = 0x70;`	109	`scheme[COL_SCROLLBAR] = 0x70;`
108	`}`	110	`}`
109		111
110		112
111	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char fname, const struct file db) {`	113	`static void ui_basic(unsigned char screenw, unsigned char screenh, const struct file *db) {`
112	`unsigned char i;`	114	`unsigned char i;`
113	`const char s = svarlang_strid(0); / HELP */`	115	`const char s = svarlang_strid(0); / HELP */`
114	`unsigned char helpcol = screenw - (strlen(s) + 4);`	116	`unsigned char helpcol = screenw - (strlen(s) + 4);`
115		117
116	`/* fill status bar with background */`	118	`/* fill status bar with background */`
117	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`	119	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`
118		120
119	`/* filename */`	121	`/* filename */`
120	`mdr_cout_str(screenh - 1, 0, fname, scheme[COL_STATUSBAR1], screenw);`	122	`mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);`
121		123
122	`/* eol type */`	124	`/* eol type */`
123	`if (db->lfonly) {`	125	`if (db->lfonly) {`
124	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`	126	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`
125	`} else {`	127	`} else {`
126	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`	128	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`
127	`}`	129	`}`
128		130
129	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	131	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
130	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	132	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
131		133
132	`/* scroll bar */`	134	`/* scroll bar */`
133	`for (i = 0; i < (screenh - 1); i++) {`	135	`for (i = 0; i < (screenh - 1); i++) {`
134	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	136	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
135	`}`	137	`}`
136	`}`	138	`}`
137		139
138		140
139	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	141	`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;`	142	`unsigned short x, y, msglen, i;`
141	`msglen = strlen(msg);`	143	`msglen = strlen(msg);`
142	`y = (screenh - 4) >> 1;`	144	`y = (screenh - 4) >> 1;`
143	`x = (screenw - msglen - 4) >> 1;`	145	`x = (screenw - msglen - 4) >> 1;`
144	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);`	146	`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);`	147	`mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);`
146		148
147	`if (uidirtyfrom > y) uidirtyfrom = y;`	149	`if (uidirtyfrom > y) uidirtyfrom = y;`
148	`if (uidirtyto < y+2) uidirtyto = y+2;`	150	`if (uidirtyto < y+2) uidirtyto = y+2;`
149	`}`	151	`}`
150		152
151		153
152	`static void ui_help(unsigned char screenw) {`	154	`static void ui_help(unsigned char screenw) {`
153	`#define MAXLINLEN 35`	155	`#define MAXLINLEN 35`
154	`unsigned short i, offset;`	156	`unsigned short i, offset;`
155	`offset = (screenw - MAXLINLEN + 1) >> 1;`	157	`offset = (screenw - MAXLINLEN + 1) >> 1;`
156	`mdr_cout_cursor_hide();`	158	`mdr_cout_cursor_hide();`
157	`for (i = 2; i <= 12; i++) {`	159	`for (i = 2; i <= 12; i++) {`
158	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`	160	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`
159	`}`	161	`}`
160		162
161	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	163	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
162	`for (i = 0; i <= 2; i++) {`	164	`for (i = 0; i <= 2; i++) {`
163	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	165	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
164	`}`	166	`}`
165	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	167	`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);`	168	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
167		169
168	`keyb_getkey();`	170	`keyb_getkey();`
169	`mdr_cout_cursor_show();`	171	`mdr_cout_cursor_show();`
170	`#undef MAXLINLEN`	172	`#undef MAXLINLEN`
171	`}`	173	`}`
172		174
173		175
174	`static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	176	`static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
175	`unsigned char x;`	177	`unsigned char x;`
176	`const struct line far *l;`	178	`const struct line far *l;`
177	`unsigned char y = db->cursorposy;`	179	`unsigned char y = db->cursorposy;`
178		180
179	`#ifdef DBG_REFRESH`	181	`#ifdef DBG_REFRESH`
180	`static char m = 'a';`	182	`static char m = 'a';`
181	`m++;`	183	`m++;`
182	`if (m > 'z') m = 'a';`	184	`if (m > 'z') m = 'a';`
183	`#endif`	185	`#endif`
184		186
185	`/* rewind cursor line to first line that needs redrawing */`	187	`/* rewind cursor line to first line that needs redrawing */`
186	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`	188	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`
187		189
188	`/* iterate over lines and redraw whatever needs to be redrawn */`	190	`/* iterate over lines and redraw whatever needs to be redrawn */`
189	`for (; l != NULL; l = l->next, y++) {`	191	`for (; l != NULL; l = l->next, y++) {`
190		192
191	`/* skip lines that do not need to be refreshed */`	193	`/* skip lines that do not need to be refreshed */`
192	`if (y < uidirtyfrom) continue;`	194	`if (y < uidirtyfrom) continue;`
193	`if (y > uidirtyto) break;`	195	`if (y > uidirtyto) break;`
194		196
195	`x = 0;`	197	`x = 0;`
196	`if (db->xoffset < l->len) {`	198	`if (db->xoffset < l->len) {`
197	`unsigned char i, limit;`	199	`unsigned char i, limit;`
198	`if (l->len - db->xoffset < screenw) {`	200	`if (l->len - db->xoffset < screenw) {`
199	`limit = l->len;`	201	`limit = l->len;`
200	`} else {`	202	`} else {`
201	`limit = db->xoffset + screenw - 1;`	203	`limit = db->xoffset + screenw - 1;`
202	`}`	204	`}`
203	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`	205	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`
204	`}`	206	`}`
205		207
206	`/* write empty spaces until end of line */`	208	`/* write empty spaces until end of line */`
207	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`	209	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`
208		210
209	`#ifdef DBG_REFRESH`	211	`#ifdef DBG_REFRESH`
210	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	212	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
211	`#endif`	213	`#endif`
212		214
213	`if (y == screenh - 2) break;`	215	`if (y == screenh - 2) break;`
214	`}`	216	`}`
215		217
216	`/* fill all lines below if empty (and they need to be redrawn) */`	218	`/* fill all lines below if empty (and they need to be redrawn) */`
217	`if (l == NULL) {`	219	`if (l == NULL) {`
218	`while ((y < screenh - 1) && (y < uidirtyto)) {`	220	`while ((y < screenh - 1) && (y < uidirtyto)) {`
219	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`	221	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`
220	`}`	222	`}`
221	`}`	223	`}`
222	`}`	224	`}`
223		225
224		226
225	`static void check_cursor_not_after_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	227	`static void check_cursor_not_after_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
226	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	228	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
227		229
228	`if (db->cursor->len < db->xoffset) {`	230	`if (db->cursor->len < db->xoffset) {`
229	`db->cursorposx = 0;`	231	`db->cursorposx = 0;`
230	`db->xoffset = db->cursor->len;`	232	`db->xoffset = db->cursor->len;`
231	`*uidirtyfrom = 0;`	233	`*uidirtyfrom = 0;`
232	`*uidirtyto = 0xff;`	234	`*uidirtyto = 0xff;`
233	`} else {`	235	`} else {`
234	`db->cursorposx = db->cursor->len - db->xoffset;`	236	`db->cursorposx = db->cursor->len - db->xoffset;`
235	`}`	237	`}`
236	`}`	238	`}`
237		239
238		240
239	`static void cursor_up(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	241	`static void cursor_up(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
240	`if (db->cursor->prev != NULL) {`	242	`if (db->cursor->prev != NULL) {`
241	`db->cursor = db->cursor->prev;`	243	`db->cursor = db->cursor->prev;`
242	`if (db->cursorposy == 0) {`	244	`if (db->cursorposy == 0) {`
243	`*uidirtyfrom = 0;`	245	`*uidirtyfrom = 0;`
244	`*uidirtyto = 0xff;`	246	`*uidirtyto = 0xff;`
245	`} else {`	247	`} else {`
246	`db->cursorposy -= 1;`	248	`db->cursorposy -= 1;`
247	`}`	249	`}`
248	`}`	250	`}`
249	`}`	251	`}`
250		252
251		253
252	`static void cursor_eol(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	254	`static void cursor_eol(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
253	`/* adjust xoffset to make sure eol is visible on screen */`	255	`/* adjust xoffset to make sure eol is visible on screen */`
254	`if (db->xoffset > db->cursor->len) {`	256	`if (db->xoffset > db->cursor->len) {`
255	`db->xoffset = db->cursor->len - 1;`	257	`db->xoffset = db->cursor->len - 1;`
256	`*uidirtyfrom = 0;`	258	`*uidirtyfrom = 0;`
257	`*uidirtyto = 0xff;`	259	`*uidirtyto = 0xff;`
258	`}`	260	`}`
259		261
260	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	262	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
261	`db->xoffset = db->cursor->len - screenw + 2;`	263	`db->xoffset = db->cursor->len - screenw + 2;`
262	`*uidirtyfrom = 0;`	264	`*uidirtyfrom = 0;`
263	`*uidirtyto = 0xff;`	265	`*uidirtyto = 0xff;`
264	`}`	266	`}`
265	`db->cursorposx = db->cursor->len - db->xoffset;`	267	`db->cursorposx = db->cursor->len - db->xoffset;`
266	`}`	268	`}`
267		269
268		270
269	`static void cursor_down(struct file db, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	271	`static void cursor_down(struct file db, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
270	`if (db->cursor->next != NULL) {`	272	`if (db->cursor->next != NULL) {`
271	`db->cursor = db->cursor->next;`	273	`db->cursor = db->cursor->next;`
272	`if (db->cursorposy < screenh - 2) {`	274	`if (db->cursorposy < screenh - 2) {`
273	`db->cursorposy += 1;`	275	`db->cursorposy += 1;`
274	`} else {`	276	`} else {`
275	`*uidirtyfrom = 0;`	277	`*uidirtyfrom = 0;`
276	`*uidirtyto = 0xff;`	278	`*uidirtyto = 0xff;`
277	`}`	279	`}`
278	`}`	280	`}`
279	`}`	281	`}`
280		282
281		283
282	`static void cursor_left(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	284	`static void cursor_left(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
283	`if (db->cursorposx > 0) {`	285	`if (db->cursorposx > 0) {`
284	`db->cursorposx -= 1;`	286	`db->cursorposx -= 1;`
285	`} else if (db->xoffset > 0) {`	287	`} else if (db->xoffset > 0) {`
286	`db->xoffset -= 1;`	288	`db->xoffset -= 1;`
287	`*uidirtyfrom = 0;`	289	`*uidirtyfrom = 0;`
288	`*uidirtyto = 0xff;`	290	`*uidirtyto = 0xff;`
289	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	291	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
290	`cursor_up(db, uidirtyfrom, uidirtyto);`	292	`cursor_up(db, uidirtyfrom, uidirtyto);`
291	`cursor_eol(db, screenw, uidirtyfrom, uidirtyto);`	293	`cursor_eol(db, screenw, uidirtyfrom, uidirtyto);`
292	`}`	294	`}`
293	`}`	295	`}`
294		296
295		297
296	`static void cursor_home(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	298	`static void cursor_home(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
297	`db->cursorposx = 0;`	299	`db->cursorposx = 0;`
298	`if (db->xoffset != 0) {`	300	`if (db->xoffset != 0) {`
299	`db->xoffset = 0;`	301	`db->xoffset = 0;`
300	`*uidirtyfrom = 0;`	302	`*uidirtyfrom = 0;`
301	`*uidirtyto = 0xff;`	303	`*uidirtyto = 0xff;`
302	`}`	304	`}`
303	`}`	305	`}`
304		306
305		307
306	`static void cursor_right(struct file db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	308	`static void cursor_right(struct file db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
307	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	309	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
308	`if (db->cursorposx < screenw - 2) {`	310	`if (db->cursorposx < screenw - 2) {`
309	`db->cursorposx += 1;`	311	`db->cursorposx += 1;`
310	`} else {`	312	`} else {`
311	`db->xoffset += 1;`	313	`db->xoffset += 1;`
312	`*uidirtyfrom = 0;`	314	`*uidirtyfrom = 0;`
313	`*uidirtyto = 0xff;`	315	`*uidirtyto = 0xff;`
314	`}`	316	`}`
315	`} else {`	317	`} else {`
316	`cursor_down(db, screenh, uidirtyfrom, uidirtyto);`	318	`cursor_down(db, screenh, uidirtyfrom, uidirtyto);`
317	`cursor_home(db, uidirtyfrom, uidirtyto);`	319	`cursor_home(db, uidirtyfrom, uidirtyto);`
318	`}`	320	`}`
319	`}`	321	`}`
320		322
321		323
322	`static void del(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	324	`static void del(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
323	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	325	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
324	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	326	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
325	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	327	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
326	`*uidirtyfrom = db->cursorposy;`	328	`*uidirtyfrom = db->cursorposy;`
327	`*uidirtyto = db->cursorposy;`	329	`*uidirtyto = db->cursorposy;`
328	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	330	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
329	`struct line far *nextline = db->cursor->next;`	331	`struct line far *nextline = db->cursor->next;`
330	`if (db->cursor->next->len > 0) {`	332	`if (db->cursor->next->len > 0) {`
331	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	333	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
332	`if (newptr != NULL) {`	334	`if (newptr != NULL) {`
333	`db->cursor = newptr;`	335	`db->cursor = newptr;`
334	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	336	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
335	`db->cursor->len += db->cursor->next->len;`	337	`db->cursor->len += db->cursor->next->len;`
336	`}`	338	`}`
337	`}`	339	`}`
338	`db->cursor->next = db->cursor->next->next;`	340	`db->cursor->next = db->cursor->next->next;`
339	`db->cursor->next->prev = db->cursor;`	341	`db->cursor->next->prev = db->cursor;`
340	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	342	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
341	`_ffree(nextline);`	343	`_ffree(nextline);`
342	`*uidirtyfrom = db->cursorposy;`	344	`*uidirtyfrom = db->cursorposy;`
343	`*uidirtyto = 0xff;`	345	`*uidirtyto = 0xff;`
344	`}`	346	`}`
345	`}`	347	`}`
346		348
347		349
348	`static void bkspc(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	350	`static void bkspc(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
349		351
350	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	352	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
351	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	353	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
352		354
353	`cursor_left(db, screenw, uidirtyfrom, uidirtyto);`	355	`cursor_left(db, screenw, uidirtyfrom, uidirtyto);`
354	`del(db, uidirtyfrom, uidirtyto);`	356	`del(db, uidirtyfrom, uidirtyto);`
355	`}`	357	`}`
356		358
357		359
358	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	360	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
359	`* of argc and argv, saves some 330 bytes of binary size */`	361	`* of argc and argv, saves some 330 bytes of binary size */`
360	`static char *parseargv(void) {`	362	`static char *parseargv(void) {`
361	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	363	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
362	`unsigned char count = 0;`	364	`unsigned char count = 0;`
363	`char *argv[4];`	365	`char *argv[4];`
364		366
365	`while (count < 4) {`	367	`while (count < 4) {`
366	`/* jump to nearest arg */`	368	`/* jump to nearest arg */`
367	`while (*tail == ' ') {`	369	`while (*tail == ' ') {`
368	`*tail = 0;`	370	`*tail = 0;`
369	`tail++;`	371	`tail++;`
370	`}`	372	`}`
371		373
372	`if (*tail == '\r') {`	374	`if (*tail == '\r') {`
373	`*tail = 0;`	375	`*tail = 0;`
374	`break;`	376	`break;`
375	`}`	377	`}`
376		378
377	`argv[count++] = tail;`	379	`argv[count++] = tail;`
378		380
379	`/* jump to next delimiter */`	381	`/* jump to next delimiter */`
380	`while ((tail != ' ') && (tail != '\r')) tail++;`	382	`while ((tail != ' ') && (tail != '\r')) tail++;`
381	`}`	383	`}`
382		384
383	`/* check args now */`	385	`/* check args now */`
384	`if (count != 1) return(NULL);`	386	`if (count != 1) return(NULL);`
385		387
386	`return(argv[0]);`	388	`return(argv[0]);`
387	`}`	389	`}`
388		390
389		391
390	`static int loadfile(struct file db, const char fname) {`	392	`static struct file loadfile(const char fname) {`
391	`char buff[1024];`	393	`char buff[1024];`
392	`unsigned int prevlen = 0, len, llen;`	394	`unsigned int prevlen = 0, len, llen;`
393	`int fd;`	395	`int fd;`
394	`int r = 0;`	396	`struct file *db;`
395		397
396	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	398	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
397	`mdr_coutraw_puts("Failed to open file:");`	399	`mdr_coutraw_puts("Failed to open file:");`
398	`mdr_coutraw_puts(fname);`	400	`mdr_coutraw_puts(fname);`
399	`return(-1);`	401	`return(NULL);`
400	`}`	402	`}`
401		403
-		404	`len = strlen(fname) + 1;`
-		405	`db = calloc(1, sizeof(struct file) + len);`
-		406	`if (db == NULL) {`
-		407	`_dos_close(fd);`
-		408	`return(NULL);`
-		409	`}`
-		410	`memcpy(db->fname, fname, len);`
-		411
402	`db->lfonly = 1;`	412	`db->lfonly = 1;`
403		413
404	`do {`	414	`do {`
405	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`	415	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`
406	`len += prevlen;`	416	`len += prevlen;`
407	`} else {`	417	`} else {`
408	`len = prevlen;`	418	`len = prevlen;`
409	`}`	419	`}`
410		420
411	`/* look for nearest \n and replace with 0*/`	421	`/* look for nearest \n and replace with 0*/`
412	`for (llen = 0; buff[llen] != '\n'; llen++) {`	422	`for (llen = 0; buff[llen] != '\n'; llen++) {`
413	`if (llen == sizeof(buff)) break;`	423	`if (llen == sizeof(buff)) { /* TODO line too long: handle it in some classy way */`
-		424	`break;`
-		425	`}`
414	`}`	426	`}`
415	`buff[llen] = 0;`	427	`buff[llen] = 0;`
416	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`	428	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`
417	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`	429	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`
418	`db->lfonly = 0;`	430	`db->lfonly = 0;`
419	`}`	431	`}`
420	`if (line_add(db, buff) != 0) {`	432	`if (line_add(db, buff) != 0) {`
421	`mdr_coutraw_puts("out of memory");`	433	`mdr_coutraw_puts("out of memory");`
-		434	`free(db);`
422	`r = -1;`	435	`db = NULL;`
423	`break;`	436	`break;`
424	`}`	437	`}`
425		438
426	`len -= llen + 1;`	439	`len -= llen + 1;`
427	`memmove(buff, buff + llen + 1, len);`	440	`memmove(buff, buff + llen + 1, len);`
428	`prevlen = len;`	441	`prevlen = len;`
429	`} while (len > 0);`	442	`} while (len > 0);`
430		443
431	`_dos_close(fd);`	444	`_dos_close(fd);`
432		445
-		446	`/* add an empty line at end if not present already, also rewind cursor to top of file */`
-		447	`if (db != NULL) {`
-		448	`if (db->cursor->len != 0) line_add(db, "");`
-		449	`db_rewind(db);`
-		450	`}`
-		451
433	`return(r);`	452	`return(db);`
434	`}`	453	`}`
435		454
436		455
437	`static int savefile(const struct file db, const char fname) {`	456	`static int savefile(const struct file *db) {`
438	`int fd;`	457	`int fd;`
439	`const struct line far *l;`	458	`const struct line far *l;`
440	`unsigned bytes;`	459	`unsigned bytes;`
441	`unsigned char eollen;`	460	`unsigned char eollen;`
442	`unsigned char eolbuf[2];`	461	`unsigned char eolbuf[2];`
443		462
444	`if (_dos_open(fname, O_WRONLY, &fd) != 0) {`	463	`if (_dos_open(db->fname, O_WRONLY, &fd) != 0) {`
445	`return(-1);`	464	`return(-1);`
446	`}`	465	`}`
447		466
448	`l = db->cursor;`	467	`l = db->cursor;`
449	`while (l->prev) l = l->prev;`	468	`while (l->prev) l = l->prev;`
450		469
451	`/* preset line terminators */`	470	`/* preset line terminators */`
452	`if (db->lfonly) {`	471	`if (db->lfonly) {`
453	`eolbuf[0] = '\n';`	472	`eolbuf[0] = '\n';`
454	`eollen = 1;`	473	`eollen = 1;`
455	`} else {`	474	`} else {`
456	`eolbuf[0] = '\r';`	475	`eolbuf[0] = '\r';`
457	`eolbuf[1] = '\n';`	476	`eolbuf[1] = '\n';`
458	`eollen = 2;`	477	`eollen = 2;`
459	`}`	478	`}`
460		479
461	`while (l) {`	480	`while (l) {`
462	`_dos_write(fd, l->payload, l->len, &bytes);`	481	`_dos_write(fd, l->payload, l->len, &bytes);`
463	`_dos_write(fd, eolbuf, eollen, &bytes);`	482	`_dos_write(fd, eolbuf, eollen, &bytes);`
464	`l = l->next;`	483	`l = l->next;`
465	`}`	484	`}`
466		485
467	`_dos_close(fd);`	486	`_dos_close(fd);`
468	`return(0);`	487	`return(0);`
469	`}`	488	`}`
470		489
471		490
472	`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) {`	491	`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) {`
473	`struct line far *n;`	492	`struct line far *n;`
474	`n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);`	493	`n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);`
475	`if (n != NULL) {`	494	`if (n != NULL) {`
476	`unsigned short off = db->xoffset + db->cursorposx;`	495	`unsigned short off = db->xoffset + db->cursorposx;`
477	`if (n->prev) n->prev->next = n;`	496	`if (n->prev) n->prev->next = n;`
478	`if (n->next) n->next->prev = n;`	497	`if (n->next) n->next->prev = n;`
479	`db->cursor = n;`	498	`db->cursor = n;`
480	`_fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);`	499	`_fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);`
481	`db->cursor->len += len;`	500	`db->cursor->len += len;`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1804 – Rev 1319 → 1320