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 */
  if (db->fname[0] == 0) {
    mdr_cout_str(screenh - 1, 0, svarlang_str(0, 1), scheme[COL_STATUSBAR1], screenw);
  } else {
    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 == 0) return("");
 
  return(argv[0]);
}
 
 
static struct file *loadfile(const char *fname) {
  char buff[1024];
  unsigned int prevlen = 0, len, llen;
  int fd;
  struct file *db;
 
  len = strlen(fname) + 1;
  db = calloc(1, sizeof(struct file) + len);
  if (db == NULL) return(NULL);
  memcpy(db->fname, fname, len);
 
  if (*fname == 0) goto SKIPLOADING;
 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
    mdr_coutraw_puts("Failed to open file:");
    mdr_coutraw_puts(fname);
    free(db);
    return(NULL);
  }
 
 
 
 
 
 
 
 
 
  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);
 
  SKIPLOADING:
 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
  if (db != NULL) {
    if ((db->cursor == NULL) || (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 1320	Rev 1321
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	`int fd;`
58	`struct line far *cursor;`	58	`struct line far *cursor;`
59	`unsigned short xoffset;`	59	`unsigned short xoffset;`
60	`unsigned char cursorposx;`	60	`unsigned char cursorposx;`
61	`unsigned char cursorposy;`	61	`unsigned char cursorposy;`
62	`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 */`	63	`char fname[1]; /* dynamically sized */`
64	`};`	64	`};`
65		65
66		66
67	`/* returns non-zero on error */`	67	`/* returns non-zero on error */`
68	`static int line_add(struct file db, const char far line) {`	68	`static int line_add(struct file db, const char far line) {`
69	`unsigned short slen;`	69	`unsigned short slen;`
70	`struct line far *l;`	70	`struct line far *l;`
71		71
72	`/* slen = strlen(line) (but for far pointer) */`	72	`/* slen = strlen(line) (but for far pointer) */`
73	`for (slen = 0; line[slen] != 0; slen++);`	73	`for (slen = 0; line[slen] != 0; slen++);`
74		74
75	`/* trim out CR/LF line endings */`	75	`/* trim out CR/LF line endings */`
76	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	76	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
77	`slen -= 2;`	77	`slen -= 2;`
78	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	78	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
79	`slen--;`	79	`slen--;`
80	`}`	80	`}`
81		81
82	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	82	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
83	`if (l == NULL) return(-1);`	83	`if (l == NULL) return(-1);`
84		84
85	`l->prev = db->cursor;`	85	`l->prev = db->cursor;`
86	`if (db->cursor) {`	86	`if (db->cursor) {`
87	`l->next = db->cursor->next;`	87	`l->next = db->cursor->next;`
88	`db->cursor->next = l;`	88	`db->cursor->next = l;`
89	`l->next->prev = l;`	89	`l->next->prev = l;`
90	`}`	90	`}`
91	`db->cursor = l;`	91	`db->cursor = l;`
92	`_fmemcpy(l->payload, line, slen);`	92	`_fmemcpy(l->payload, line, slen);`
93	`l->len = slen;`	93	`l->len = slen;`
94		94
95	`return(0);`	95	`return(0);`
96	`}`	96	`}`
97		97
98		98
99	`static void db_rewind(struct file *db) {`	99	`static void db_rewind(struct file *db) {`
100	`if (db->cursor == NULL) return;`	100	`if (db->cursor == NULL) return;`
101	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	101	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
102	`}`	102	`}`
103		103
104		104
105	`static void load_colorscheme(void) {`	105	`static void load_colorscheme(void) {`
106	`scheme[COL_TXT] = 0x17;`	106	`scheme[COL_TXT] = 0x17;`
107	`scheme[COL_STATUSBAR1] = 0x70;`	107	`scheme[COL_STATUSBAR1] = 0x70;`
108	`scheme[COL_STATUSBAR2] = 0x78;`	108	`scheme[COL_STATUSBAR2] = 0x78;`
109	`scheme[COL_SCROLLBAR] = 0x70;`	109	`scheme[COL_SCROLLBAR] = 0x70;`
110	`}`	110	`}`
111		111
112		112
113	`static void ui_basic(unsigned char screenw, unsigned char screenh, const struct file *db) {`	113	`static void ui_basic(unsigned char screenw, unsigned char screenh, const struct file *db) {`
114	`unsigned char i;`	114	`unsigned char i;`
115	`const char s = svarlang_strid(0); / HELP */`	115	`const char s = svarlang_strid(0); / HELP */`
116	`unsigned char helpcol = screenw - (strlen(s) + 4);`	116	`unsigned char helpcol = screenw - (strlen(s) + 4);`
117		117
118	`/* fill status bar with background */`	118	`/* fill status bar with background */`
119	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`	119	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`
120		120
121	`/* filename */`	121	`/* filename */`
-		122	`if (db->fname[0] == 0) {`
-		123	`mdr_cout_str(screenh - 1, 0, svarlang_str(0, 1), scheme[COL_STATUSBAR1], screenw);`
-		124	`} else {`
122	`mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);`	125	`mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);`
-		126	`}`
123		127
124	`/* eol type */`	128	`/* eol type */`
125	`if (db->lfonly) {`	129	`if (db->lfonly) {`
126	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`	130	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`
127	`} else {`	131	`} else {`
128	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`	132	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`
129	`}`	133	`}`
130		134
131	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	135	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
132	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	136	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
133		137
134	`/* scroll bar */`	138	`/* scroll bar */`
135	`for (i = 0; i < (screenh - 1); i++) {`	139	`for (i = 0; i < (screenh - 1); i++) {`
136	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	140	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
137	`}`	141	`}`
138	`}`	142	`}`
139		143
140		144
141	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	145	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
142	`unsigned short x, y, msglen, i;`	146	`unsigned short x, y, msglen, i;`
143	`msglen = strlen(msg);`	147	`msglen = strlen(msg);`
144	`y = (screenh - 4) >> 1;`	148	`y = (screenh - 4) >> 1;`
145	`x = (screenw - msglen - 4) >> 1;`	149	`x = (screenw - msglen - 4) >> 1;`
146	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);`	150	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);`
147	`mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);`	151	`mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);`
148		152
149	`if (uidirtyfrom > y) uidirtyfrom = y;`	153	`if (uidirtyfrom > y) uidirtyfrom = y;`
150	`if (uidirtyto < y+2) uidirtyto = y+2;`	154	`if (uidirtyto < y+2) uidirtyto = y+2;`
151	`}`	155	`}`
152		156
153		157
154	`static void ui_help(unsigned char screenw) {`	158	`static void ui_help(unsigned char screenw) {`
155	`#define MAXLINLEN 35`	159	`#define MAXLINLEN 35`
156	`unsigned short i, offset;`	160	`unsigned short i, offset;`
157	`offset = (screenw - MAXLINLEN + 1) >> 1;`	161	`offset = (screenw - MAXLINLEN + 1) >> 1;`
158	`mdr_cout_cursor_hide();`	162	`mdr_cout_cursor_hide();`
159	`for (i = 2; i <= 12; i++) {`	163	`for (i = 2; i <= 12; i++) {`
160	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`	164	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`
161	`}`	165	`}`
162		166
163	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	167	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
164	`for (i = 0; i <= 2; i++) {`	168	`for (i = 0; i <= 2; i++) {`
165	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	169	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
166	`}`	170	`}`
167	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	171	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
168	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	172	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
169		173
170	`keyb_getkey();`	174	`keyb_getkey();`
171	`mdr_cout_cursor_show();`	175	`mdr_cout_cursor_show();`
172	`#undef MAXLINLEN`	176	`#undef MAXLINLEN`
173	`}`	177	`}`
174		178
175		179
176	`static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	180	`static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
177	`unsigned char x;`	181	`unsigned char x;`
178	`const struct line far *l;`	182	`const struct line far *l;`
179	`unsigned char y = db->cursorposy;`	183	`unsigned char y = db->cursorposy;`
180		184
181	`#ifdef DBG_REFRESH`	185	`#ifdef DBG_REFRESH`
182	`static char m = 'a';`	186	`static char m = 'a';`
183	`m++;`	187	`m++;`
184	`if (m > 'z') m = 'a';`	188	`if (m > 'z') m = 'a';`
185	`#endif`	189	`#endif`
186		190
187	`/* rewind cursor line to first line that needs redrawing */`	191	`/* rewind cursor line to first line that needs redrawing */`
188	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`	192	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`
189		193
190	`/* iterate over lines and redraw whatever needs to be redrawn */`	194	`/* iterate over lines and redraw whatever needs to be redrawn */`
191	`for (; l != NULL; l = l->next, y++) {`	195	`for (; l != NULL; l = l->next, y++) {`
192		196
193	`/* skip lines that do not need to be refreshed */`	197	`/* skip lines that do not need to be refreshed */`
194	`if (y < uidirtyfrom) continue;`	198	`if (y < uidirtyfrom) continue;`
195	`if (y > uidirtyto) break;`	199	`if (y > uidirtyto) break;`
196		200
197	`x = 0;`	201	`x = 0;`
198	`if (db->xoffset < l->len) {`	202	`if (db->xoffset < l->len) {`
199	`unsigned char i, limit;`	203	`unsigned char i, limit;`
200	`if (l->len - db->xoffset < screenw) {`	204	`if (l->len - db->xoffset < screenw) {`
201	`limit = l->len;`	205	`limit = l->len;`
202	`} else {`	206	`} else {`
203	`limit = db->xoffset + screenw - 1;`	207	`limit = db->xoffset + screenw - 1;`
204	`}`	208	`}`
205	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`	209	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`
206	`}`	210	`}`
207		211
208	`/* write empty spaces until end of line */`	212	`/* write empty spaces until end of line */`
209	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`	213	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`
210		214
211	`#ifdef DBG_REFRESH`	215	`#ifdef DBG_REFRESH`
212	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	216	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
213	`#endif`	217	`#endif`
214		218
215	`if (y == screenh - 2) break;`	219	`if (y == screenh - 2) break;`
216	`}`	220	`}`
217		221
218	`/* fill all lines below if empty (and they need to be redrawn) */`	222	`/* fill all lines below if empty (and they need to be redrawn) */`
219	`if (l == NULL) {`	223	`if (l == NULL) {`
220	`while ((y < screenh - 1) && (y < uidirtyto)) {`	224	`while ((y < screenh - 1) && (y < uidirtyto)) {`
221	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`	225	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`
222	`}`	226	`}`
223	`}`	227	`}`
224	`}`	228	`}`
225		229
226		230
227	`static void check_cursor_not_after_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	231	`static void check_cursor_not_after_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
228	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	232	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
229		233
230	`if (db->cursor->len < db->xoffset) {`	234	`if (db->cursor->len < db->xoffset) {`
231	`db->cursorposx = 0;`	235	`db->cursorposx = 0;`
232	`db->xoffset = db->cursor->len;`	236	`db->xoffset = db->cursor->len;`
233	`*uidirtyfrom = 0;`	237	`*uidirtyfrom = 0;`
234	`*uidirtyto = 0xff;`	238	`*uidirtyto = 0xff;`
235	`} else {`	239	`} else {`
236	`db->cursorposx = db->cursor->len - db->xoffset;`	240	`db->cursorposx = db->cursor->len - db->xoffset;`
237	`}`	241	`}`
238	`}`	242	`}`
239		243
240		244
241	`static void cursor_up(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	245	`static void cursor_up(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
242	`if (db->cursor->prev != NULL) {`	246	`if (db->cursor->prev != NULL) {`
243	`db->cursor = db->cursor->prev;`	247	`db->cursor = db->cursor->prev;`
244	`if (db->cursorposy == 0) {`	248	`if (db->cursorposy == 0) {`
245	`*uidirtyfrom = 0;`	249	`*uidirtyfrom = 0;`
246	`*uidirtyto = 0xff;`	250	`*uidirtyto = 0xff;`
247	`} else {`	251	`} else {`
248	`db->cursorposy -= 1;`	252	`db->cursorposy -= 1;`
249	`}`	253	`}`
250	`}`	254	`}`
251	`}`	255	`}`
252		256
253		257
254	`static void cursor_eol(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	258	`static void cursor_eol(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
255	`/* adjust xoffset to make sure eol is visible on screen */`	259	`/* adjust xoffset to make sure eol is visible on screen */`
256	`if (db->xoffset > db->cursor->len) {`	260	`if (db->xoffset > db->cursor->len) {`
257	`db->xoffset = db->cursor->len - 1;`	261	`db->xoffset = db->cursor->len - 1;`
258	`*uidirtyfrom = 0;`	262	`*uidirtyfrom = 0;`
259	`*uidirtyto = 0xff;`	263	`*uidirtyto = 0xff;`
260	`}`	264	`}`
261		265
262	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	266	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
263	`db->xoffset = db->cursor->len - screenw + 2;`	267	`db->xoffset = db->cursor->len - screenw + 2;`
264	`*uidirtyfrom = 0;`	268	`*uidirtyfrom = 0;`
265	`*uidirtyto = 0xff;`	269	`*uidirtyto = 0xff;`
266	`}`	270	`}`
267	`db->cursorposx = db->cursor->len - db->xoffset;`	271	`db->cursorposx = db->cursor->len - db->xoffset;`
268	`}`	272	`}`
269		273
270		274
271	`static void cursor_down(struct file db, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	275	`static void cursor_down(struct file db, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
272	`if (db->cursor->next != NULL) {`	276	`if (db->cursor->next != NULL) {`
273	`db->cursor = db->cursor->next;`	277	`db->cursor = db->cursor->next;`
274	`if (db->cursorposy < screenh - 2) {`	278	`if (db->cursorposy < screenh - 2) {`
275	`db->cursorposy += 1;`	279	`db->cursorposy += 1;`
276	`} else {`	280	`} else {`
277	`*uidirtyfrom = 0;`	281	`*uidirtyfrom = 0;`
278	`*uidirtyto = 0xff;`	282	`*uidirtyto = 0xff;`
279	`}`	283	`}`
280	`}`	284	`}`
281	`}`	285	`}`
282		286
283		287
284	`static void cursor_left(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	288	`static void cursor_left(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
285	`if (db->cursorposx > 0) {`	289	`if (db->cursorposx > 0) {`
286	`db->cursorposx -= 1;`	290	`db->cursorposx -= 1;`
287	`} else if (db->xoffset > 0) {`	291	`} else if (db->xoffset > 0) {`
288	`db->xoffset -= 1;`	292	`db->xoffset -= 1;`
289	`*uidirtyfrom = 0;`	293	`*uidirtyfrom = 0;`
290	`*uidirtyto = 0xff;`	294	`*uidirtyto = 0xff;`
291	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	295	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
292	`cursor_up(db, uidirtyfrom, uidirtyto);`	296	`cursor_up(db, uidirtyfrom, uidirtyto);`
293	`cursor_eol(db, screenw, uidirtyfrom, uidirtyto);`	297	`cursor_eol(db, screenw, uidirtyfrom, uidirtyto);`
294	`}`	298	`}`
295	`}`	299	`}`
296		300
297		301
298	`static void cursor_home(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	302	`static void cursor_home(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
299	`db->cursorposx = 0;`	303	`db->cursorposx = 0;`
300	`if (db->xoffset != 0) {`	304	`if (db->xoffset != 0) {`
301	`db->xoffset = 0;`	305	`db->xoffset = 0;`
302	`*uidirtyfrom = 0;`	306	`*uidirtyfrom = 0;`
303	`*uidirtyto = 0xff;`	307	`*uidirtyto = 0xff;`
304	`}`	308	`}`
305	`}`	309	`}`
306		310
307		311
308	`static void cursor_right(struct file db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	312	`static void cursor_right(struct file db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
309	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	313	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
310	`if (db->cursorposx < screenw - 2) {`	314	`if (db->cursorposx < screenw - 2) {`
311	`db->cursorposx += 1;`	315	`db->cursorposx += 1;`
312	`} else {`	316	`} else {`
313	`db->xoffset += 1;`	317	`db->xoffset += 1;`
314	`*uidirtyfrom = 0;`	318	`*uidirtyfrom = 0;`
315	`*uidirtyto = 0xff;`	319	`*uidirtyto = 0xff;`
316	`}`	320	`}`
317	`} else {`	321	`} else {`
318	`cursor_down(db, screenh, uidirtyfrom, uidirtyto);`	322	`cursor_down(db, screenh, uidirtyfrom, uidirtyto);`
319	`cursor_home(db, uidirtyfrom, uidirtyto);`	323	`cursor_home(db, uidirtyfrom, uidirtyto);`
320	`}`	324	`}`
321	`}`	325	`}`
322		326
323		327
324	`static void del(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	328	`static void del(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
325	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	329	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
326	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	330	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
327	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	331	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
328	`*uidirtyfrom = db->cursorposy;`	332	`*uidirtyfrom = db->cursorposy;`
329	`*uidirtyto = db->cursorposy;`	333	`*uidirtyto = db->cursorposy;`
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) */`	334	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
331	`struct line far *nextline = db->cursor->next;`	335	`struct line far *nextline = db->cursor->next;`
332	`if (db->cursor->next->len > 0) {`	336	`if (db->cursor->next->len > 0) {`
333	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	337	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
334	`if (newptr != NULL) {`	338	`if (newptr != NULL) {`
335	`db->cursor = newptr;`	339	`db->cursor = newptr;`
336	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	340	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
337	`db->cursor->len += db->cursor->next->len;`	341	`db->cursor->len += db->cursor->next->len;`
338	`}`	342	`}`
339	`}`	343	`}`
340	`db->cursor->next = db->cursor->next->next;`	344	`db->cursor->next = db->cursor->next->next;`
341	`db->cursor->next->prev = db->cursor;`	345	`db->cursor->next->prev = db->cursor;`
342	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	346	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
343	`_ffree(nextline);`	347	`_ffree(nextline);`
344	`*uidirtyfrom = db->cursorposy;`	348	`*uidirtyfrom = db->cursorposy;`
345	`*uidirtyto = 0xff;`	349	`*uidirtyto = 0xff;`
346	`}`	350	`}`
347	`}`	351	`}`
348		352
349		353
350	`static void bkspc(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	354	`static void bkspc(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
351		355
352	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	356	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
353	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	357	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
354		358
355	`cursor_left(db, screenw, uidirtyfrom, uidirtyto);`	359	`cursor_left(db, screenw, uidirtyfrom, uidirtyto);`
356	`del(db, uidirtyfrom, uidirtyto);`	360	`del(db, uidirtyfrom, uidirtyto);`
357	`}`	361	`}`
358		362
359		363
360	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	364	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
361	`* of argc and argv, saves some 330 bytes of binary size */`	365	`* of argc and argv, saves some 330 bytes of binary size */`
362	`static char *parseargv(void) {`	366	`static char *parseargv(void) {`
363	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	367	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
364	`unsigned char count = 0;`	368	`unsigned char count = 0;`
365	`char *argv[4];`	369	`char *argv[4];`
366		370
367	`while (count < 4) {`	371	`while (count < 4) {`
368	`/* jump to nearest arg */`	372	`/* jump to nearest arg */`
369	`while (*tail == ' ') {`	373	`while (*tail == ' ') {`
370	`*tail = 0;`	374	`*tail = 0;`
371	`tail++;`	375	`tail++;`
372	`}`	376	`}`
373		377
374	`if (*tail == '\r') {`	378	`if (*tail == '\r') {`
375	`*tail = 0;`	379	`*tail = 0;`
376	`break;`	380	`break;`
377	`}`	381	`}`
378		382
379	`argv[count++] = tail;`	383	`argv[count++] = tail;`
380		384
381	`/* jump to next delimiter */`	385	`/* jump to next delimiter */`
382	`while ((tail != ' ') && (tail != '\r')) tail++;`	386	`while ((tail != ' ') && (tail != '\r')) tail++;`
383	`}`	387	`}`
384		388
385	`/* check args now */`	389	`/* check args now */`
386	`if (count != 1) return(NULL);`	390	`if (count == 0) return("");`
387		391
388	`return(argv[0]);`	392	`return(argv[0]);`
389	`}`	393	`}`
390		394
391		395
392	`static struct file loadfile(const char fname) {`	396	`static struct file loadfile(const char fname) {`
393	`char buff[1024];`	397	`char buff[1024];`
394	`unsigned int prevlen = 0, len, llen;`	398	`unsigned int prevlen = 0, len, llen;`
395	`int fd;`	399	`int fd;`
396	`struct file *db;`	400	`struct file *db;`
397		401
-		402	`len = strlen(fname) + 1;`
-		403	`db = calloc(1, sizeof(struct file) + len);`
-		404	`if (db == NULL) return(NULL);`
-		405	`memcpy(db->fname, fname, len);`
-		406
-		407	`if (*fname == 0) goto SKIPLOADING;`
-		408
398	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	409	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
399	`mdr_coutraw_puts("Failed to open file:");`	410	`mdr_coutraw_puts("Failed to open file:");`
400	`mdr_coutraw_puts(fname);`	411	`mdr_coutraw_puts(fname);`
-		412	`free(db);`
401	`return(NULL);`	413	`return(NULL);`
402	`}`	414	`}`
403		415
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		-
412	`db->lfonly = 1;`	416	`db->lfonly = 1;`
413		417
414	`do {`	418	`do {`
415	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`	419	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`
416	`len += prevlen;`	420	`len += prevlen;`
417	`} else {`	421	`} else {`
418	`len = prevlen;`	422	`len = prevlen;`
419	`}`	423	`}`
420		424
421	`/* look for nearest \n and replace with 0*/`	425	`/* look for nearest \n and replace with 0*/`
422	`for (llen = 0; buff[llen] != '\n'; llen++) {`	426	`for (llen = 0; buff[llen] != '\n'; llen++) {`
423	`if (llen == sizeof(buff)) { /* TODO line too long: handle it in some classy way */`	427	`if (llen == sizeof(buff)) { /* TODO line too long: handle it in some classy way */`
424	`break;`	428	`break;`
425	`}`	429	`}`
426	`}`	430	`}`
427	`buff[llen] = 0;`	431	`buff[llen] = 0;`
428	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`	432	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`
429	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`	433	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`
430	`db->lfonly = 0;`	434	`db->lfonly = 0;`
431	`}`	435	`}`
432	`if (line_add(db, buff) != 0) {`	436	`if (line_add(db, buff) != 0) {`
433	`mdr_coutraw_puts("out of memory");`	437	`mdr_coutraw_puts("out of memory");`
434	`free(db);`	438	`free(db);`
435	`db = NULL;`	439	`db = NULL;`
436	`break;`	440	`break;`
437	`}`	441	`}`
438		442
439	`len -= llen + 1;`	443	`len -= llen + 1;`
440	`memmove(buff, buff + llen + 1, len);`	444	`memmove(buff, buff + llen + 1, len);`
441	`prevlen = len;`	445	`prevlen = len;`
442	`} while (len > 0);`	446	`} while (len > 0);`
443		447
444	`_dos_close(fd);`	448	`_dos_close(fd);`
445		449
-		450	`SKIPLOADING:`
-		451
446	`/* add an empty line at end if not present already, also rewind cursor to top of file */`	452	`/* add an empty line at end if not present already, also rewind cursor to top of file */`
447	`if (db != NULL) {`	453	`if (db != NULL) {`
448	`if (db->cursor->len != 0) line_add(db, "");`	454	`if ((db->cursor == NULL) \|\| (db->cursor->len != 0)) line_add(db, "");`
449	`db_rewind(db);`	455	`db_rewind(db);`
450	`}`	456	`}`
451		457
452	`return(db);`	458	`return(db);`
453	`}`	459	`}`
454		460
455		461
456	`static int savefile(const struct file *db) {`	462	`static int savefile(const struct file *db) {`
457	`int fd;`	463	`int fd;`
458	`const struct line far *l;`	464	`const struct line far *l;`
459	`unsigned bytes;`	465	`unsigned bytes;`
460	`unsigned char eollen;`	466	`unsigned char eollen;`
461	`unsigned char eolbuf[2];`	467	`unsigned char eolbuf[2];`
462		468
463	`if (_dos_open(db->fname, O_WRONLY, &fd) != 0) {`	469	`if (_dos_open(db->fname, O_WRONLY, &fd) != 0) {`
464	`return(-1);`	470	`return(-1);`
465	`}`	471	`}`
466		472
467	`l = db->cursor;`	473	`l = db->cursor;`
468	`while (l->prev) l = l->prev;`	474	`while (l->prev) l = l->prev;`
469		475
470	`/* preset line terminators */`	476	`/* preset line terminators */`
471	`if (db->lfonly) {`	477	`if (db->lfonly) {`
472	`eolbuf[0] = '\n';`	478	`eolbuf[0] = '\n';`
473	`eollen = 1;`	479	`eollen = 1;`
474	`} else {`	480	`} else {`
475	`eolbuf[0] = '\r';`	481	`eolbuf[0] = '\r';`
476	`eolbuf[1] = '\n';`	482	`eolbuf[1] = '\n';`
477	`eollen = 2;`	483	`eollen = 2;`
478	`}`	484	`}`
479		485
480	`while (l) {`	486	`while (l) {`
481	`_dos_write(fd, l->payload, l->len, &bytes);`	487	`_dos_write(fd, l->payload, l->len, &bytes);`
482	`_dos_write(fd, eolbuf, eollen, &bytes);`	488	`_dos_write(fd, eolbuf, eollen, &bytes);`
483	`l = l->next;`	489	`l = l->next;`
484	`}`	490	`}`
485		491
486	`_dos_close(fd);`	492	`_dos_close(fd);`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1387 – Rev 1320 → 1321