WebSVN – SvarDOS – Diff – /sved/trunk/sved.c


/* Sved, the SvarDOS editor
 *
 * Copyright (C) 2023 Mateusz Viste
 *
 * Sved is released under the terms of the MIT license.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
 
#include <dos.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>   /* _fcalloc() */
 
#include "mdr\bios.h"
#include "mdr\cout.h"
#include "mdr\dos.h"
#include "mdr\keyb.h"
 
#include "svarlang\svarlang.h"
 
#define COL_TXT        0
#define COL_STATUSBAR1 1
#define COL_STATUSBAR2 2
#define COL_SCROLLBAR  3
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};
 
#define SCROLL_CURSOR 0xB1
 
 
struct line {
  struct line far *prev;
  struct line far *next;
  unsigned short len;
  char payload[1];
};
 
struct file {
  struct line far *cursor;
  unsigned short xoffset;
  unsigned char cursorposx;
  unsigned char cursorposy;
  char lfonly; /* set if line endings are LF (CR/LF otherwise) */
};
 
 
/* returns non-zero on error */
static int line_add(struct file *db, const char far *line) {
  unsigned short slen;
  struct line far *l;
 
  /* slen = strlen(line) (but for far pointer) */
  for (slen = 0; line[slen] != 0; slen++);
 
  /* trim out CR/LF line endings */
  if ((slen >= 2) && (line[slen - 2] == '\r')) {
    slen -= 2;
  } else if ((slen >= 1) && (line[slen - 1] == '\n')) {
    slen--;
  }
 
  l = _fcalloc(1, sizeof(struct line) + slen + 1);
  if (l == NULL) return(-1);
 
  l->prev = db->cursor;
  if (db->cursor) {
    l->next = db->cursor->next;
    db->cursor->next = l;
    l->next->prev = l;
  }
  db->cursor = l;
  _fmemcpy(l->payload, line, slen);
  l->len = slen;
 
  return(0);
}
 
 
static void db_rewind(struct file *db) {
  if (db->cursor == NULL) return;
  while (db->cursor->prev) db->cursor = db->cursor->prev;
}
 
 
static void load_colorscheme(void) {
  scheme[COL_TXT] = 0x17;
  scheme[COL_STATUSBAR1] = 0x70;
  scheme[COL_STATUSBAR2] = 0x78;
  scheme[COL_SCROLLBAR] = 0x70;
}
 
 
static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname, const struct file *db) {
  unsigned char i;
  const char *s = svarlang_strid(0); /* HELP */
  unsigned char helpcol = screenw - (strlen(s) + 4);
 
  /* fill status bar with background */
  mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);
 
  /* filename */
  mdr_cout_str(screenh - 1, 0, fname, scheme[COL_STATUSBAR1], screenw);
 
  /* eol type */
  if (db->lfonly) {
    mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);
  } else {
    mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);
  }
 
  mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);
  mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);
 
  /* scroll bar */
  for (i = 0; i < (screenh - 1); i++) {
    mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
  }
}
 
 
static void ui_msg(const char *msg, unsigned char screenw, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  unsigned short x, y, msglen, i;
  msglen = strlen(msg);
  y = (screenh - 4) >> 1;
  x = (screenw - msglen - 4) >> 1;
  for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);
  mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);
 
  if (*uidirtyfrom > y) *uidirtyfrom = y;
  if (*uidirtyto < y+2) *uidirtyto = y+2;
}
 
 
static void ui_help(unsigned char screenw) {
#define MAXLINLEN 35
  unsigned short i, offset;
  offset = (screenw - MAXLINLEN + 1) >> 1;
  mdr_cout_cursor_hide();
  for (i = 2; i <= 12; i++) {
    mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);
  }
 
  mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);
  for (i = 0; i <= 2; i++) {
    mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);
  }
  mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);
  mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);
 
  keyb_getkey();
  mdr_cout_cursor_show();
#undef MAXLINLEN
}
 
 
static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {
  unsigned char len;
  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;
 
    if (db->xoffset < l->len) {
      for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);
    } else {
      len = 0;
    }
    while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);
 
#ifdef DBG_REFRESH
    mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
#endif
 
    if (y == screenh - 2) break;
  }
 
}
 
 
static void check_cursor_not_after_eol(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
 
  if (db->cursor->len < db->xoffset) {
    db->cursorposx = 0;
    db->xoffset = db->cursor->len;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  } else {
    db->cursorposx = db->cursor->len - db->xoffset;
  }
}
 
 
static void cursor_up(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->prev != NULL) {
    db->cursor = db->cursor->prev;
    if (db->cursorposy == 0) {
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    } else {
      db->cursorposy -= 1;
    }
  }
}
 
 
static void cursor_eol(struct file *db, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  /* adjust xoffset to make sure eol is visible on screen */
  if (db->xoffset > db->cursor->len) {
    db->xoffset = db->cursor->len - 1;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
    db->xoffset = db->cursor->len - screenw + 2;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
  db->cursorposx = db->cursor->len - db->xoffset;
}
 
 
static void cursor_down(struct file *db, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->next != NULL) {
    db->cursor = db->cursor->next;
    if (db->cursorposy < screenh - 2) {
      db->cursorposy += 1;
    } else {
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    }
  }
}
 
 
static void cursor_left(struct file *db, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursorposx > 0) {
    db->cursorposx -= 1;
  } else if (db->xoffset > 0) {
    db->xoffset -= 1;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
    cursor_up(db, uidirtyfrom, uidirtyto);
    cursor_eol(db, screenw, uidirtyfrom, uidirtyto);
  }
}
 
 
static void cursor_home(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  db->cursorposx = 0;
  if (db->xoffset != 0) {
    db->xoffset = 0;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
}
 
 
static void cursor_right(struct file *db, unsigned char screenw, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->len > db->xoffset + db->cursorposx) {
    if (db->cursorposx < screenw - 2) {
      db->cursorposx += 1;
    } else {
      db->xoffset += 1;
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    }
  } else {
    cursor_down(db, screenh, uidirtyfrom, uidirtyto);
    cursor_home(db, uidirtyfrom, uidirtyto);
  }
}
 
 
static void del(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursorposx + db->xoffset < db->cursor->len) {
    _fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
    *uidirtyfrom = db->cursorposy;
    *uidirtyto = db->cursorposy;
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
    struct line far *nextline = db->cursor->next;
    if (db->cursor->next->len > 0) {
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
      if (newptr != NULL) {
        db->cursor = newptr;
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
        db->cursor->len += db->cursor->next->len;
      }
    }
    db->cursor->next = db->cursor->next->next;
    db->cursor->next->prev = db->cursor;
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
    _ffree(nextline);
    *uidirtyfrom = db->cursorposy;
    *uidirtyto = 0xff;
  }
}
 
 
static void bkspc(struct file *db, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
 
  cursor_left(db, screenw, uidirtyfrom, uidirtyto);
  del(db, uidirtyfrom, uidirtyto);
}
 
 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
 * of argc and argv, saves some 330 bytes of binary size */
static char *parseargv(void) {
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
  unsigned char count = 0;
  char *argv[4];
 
  while (count < 4) {
    /* jump to nearest arg */
    while (*tail == ' ') {
      *tail = 0;
      tail++;
    }
 
    if (*tail == '\r') {
      *tail = 0;
      break;
    }
 
    argv[count++] = tail;
 
    /* jump to next delimiter */
    while ((*tail != ' ') && (*tail != '\r')) tail++;
  }
 
  /* check args now */
  if (count != 1) return(NULL);
 
  return(argv[0]);
}
 
 
static int loadfile(struct file *db, const char *fname) {
  char buff[1024];
  unsigned int prevlen = 0, len, llen;
  int fd;
  int r = 0;
 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
    mdr_coutraw_puts("Failed to open file:");
    mdr_coutraw_puts(fname);
    return(-1);
  }
 
  db->lfonly = 1;
 
  do {
    if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {
      len += prevlen;
    } else {
      len = prevlen;
    }
 
    /* look for nearest \n and replace with 0*/
    for (llen = 0; buff[llen] != '\n'; llen++) {
      if (llen == sizeof(buff)) break;
    }
    buff[llen] = 0;
    if ((llen > 0) && (buff[llen - 1] == '\r')) {
      buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */
      db->lfonly = 0;
    }
    if (line_add(db, buff) != 0) {
      mdr_coutraw_puts("out of memory");
      r = -1;
      break;
    }
 
    len -= llen + 1;
    memmove(buff, buff + llen + 1, len);
    prevlen = len;
  } while (len > 0);
 
  _dos_close(fd);
 
  return(r);
}
 
 
static int savefile(const struct file *db, const char *fname) {
  int fd;
  const struct line far *l;
  unsigned bytes;
  unsigned char eollen;
  unsigned char eolbuf[2];
 
  if (_dos_open(fname, O_WRONLY, &fd) != 0) {
    return(-1);
  }
 
  l = db->cursor;
  while (l->prev) l = l->prev;
 
  /* preset line terminators */
  if (db->lfonly) {
    eolbuf[0] = '\n';
    eollen = 1;
  } else {
    eolbuf[0] = '\r';
    eolbuf[1] = '\n';
    eollen = 2;
  }
 
  while (l) {
    _dos_write(fd, l->payload, l->len, &bytes);
    _dos_write(fd, eolbuf, eollen, &bytes);
    l = l->next;
  }
 
  _dos_close(fd);
  return(0);
}
 
 
int main(void) {
  const char *fname;
  struct file db;
  unsigned char screenw = 0, screenh = 0;
 
  unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */
 
  bzero(&db, sizeof(db));
 
  {
    char nlspath[128], lang[8];
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
  }
 
  fname = parseargv();
 
  if (fname == NULL) {
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
    return(0);
  }
 
  /* load file */
  if (loadfile(&db, fname) != 0) return(1);
 
  /* add an empty line at end if not present already */
  if (db.cursor->len != 0) line_add(&db, "");
 
  if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
  ui_basic(screenw, screenh, fname, &db);
 
  db_rewind(&db);
 
  for (;;) {
    int k;
 
    check_cursor_not_after_eol(&db, &uidirtyfrom, &uidirtyto);
    mdr_cout_locate(db.cursorposy, db.cursorposx);
 
    if (uidirtyfrom != 0xff) {
      ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);
      uidirtyfrom = 0xff;
    }
 
    k = keyb_getkey();
 
    if (k == 0x150) { /* down */
      cursor_down(&db, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x148) { /* up */
      cursor_up(&db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14D) { /* right */
      cursor_right(&db, screenw, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14B) { /* left */
      cursor_left(&db, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x149) { /* pgup */
      // TODO
 
    } else if (k == 0x151) { /* pgdown */
      // TODO
 
    } else if (k == 0x147) { /* home */
       cursor_home(&db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14F) { /* end */
       cursor_eol(&db, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x1B) { /* ESC */
      break;
 
    } else if (k == 0x0D) { /* ENTER */
      /* add a new line */
      if (line_add(&db, db.cursor->payload + db.xoffset + db.cursorposx) == 0) {
        /* trim the line above */
        db.cursor->prev->len = db.xoffset + db.cursorposx;
        db.cursor->prev->payload[db.cursor->prev->len] = 0;
        /* move cursor to the (new) line below */
        db.cursorposx = 0;
        if (db.cursorposy < screenh - 2) {
          uidirtyfrom = db.cursorposy;
          db.cursorposy++;
        } else {
          uidirtyfrom = 0;
        }
        uidirtyto = 0xff;
      } else {
        /* ERROR: OUT OF MEMORY */
      }
 
    } else if (k == 0x153) {  /* DEL */
      del(&db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x008) { /* BKSPC */
      bkspc(&db, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
      struct line far *n;
      n = _frealloc(db.cursor, sizeof(struct line) + db.cursor->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 + 1, db.cursor->payload + off, db.cursor->len - off + 1);
        db.cursor->len += 1;
        uidirtyfrom = db.cursorposy;
        uidirtyto = db.cursorposy;
        db.cursor->payload[off] = k;
        cursor_right(&db, screenw, screenh, &uidirtyfrom, &uidirtyto);
      }
 
    } else if (k == 0x13b) { /* F1 */
      ui_help(screenw);
      uidirtyfrom = 0;
      uidirtyto = 0xff;
 
    } else if (k == 0x13f) { /* F5 */
      const char *m[] = {"SAVED", "SAVING FILE FAILED"};
      int i;
      i = !!savefile(&db, fname);
      ui_msg(m[i], screenw, screenh, &uidirtyfrom, &uidirtyto);
      mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
 
    } else if (k == 0x144) { /* F10 */
      db.lfonly ^= 1;
      ui_basic(screenw, screenh, fname, &db);
 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
      char buff[4];
      const char *HEX = "0123456789ABCDEF";
      buff[0] = HEX[(k >> 8) & 15];
      buff[1] = HEX[(k >> 4) & 15];
      buff[2] = HEX[k & 15];
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);
      mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);
      keyb_getkey();
      break;
    }
  }
 
  mdr_cout_close();
 
  /* TODO free memory */
 
  return(0);
}
 

Rev 1315	Rev 1316
1	`/* Sved, the SvarDOS editor`	1	`/* Sved, the SvarDOS editor`
2	`*`	2	`*`
3	`* Copyright (C) 2023 Mateusz Viste`	3	`* Copyright (C) 2023 Mateusz Viste`
4	`*`	4	`*`
5	`* Sved is released under the terms of the MIT license.`	5	`* Sved is released under the terms of the MIT license.`
6	`*`	6	`*`
7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`	7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`
8	`* of this software and associated documentation files (the "Software"), to`	8	`* of this software and associated documentation files (the "Software"), to`
9	`* deal in the Software without restriction, including without limitation the`	9	`* deal in the Software without restriction, including without limitation the`
10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`	10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`
11	`* sell copies of the Software, and to permit persons to whom the Software is`	11	`* sell copies of the Software, and to permit persons to whom the Software is`
12	`* furnished to do so, subject to the following conditions:`	12	`* furnished to do so, subject to the following conditions:`
13	`*`	13	`*`
14	`* The above copyright notice and this permission notice shall be included in`	14	`* The above copyright notice and this permission notice shall be included in`
15	`* all copies or substantial portions of the Software.`	15	`* all copies or substantial portions of the Software.`
16	`*`	16	`*`
17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`	17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`	18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`	19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`
20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`	20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`
21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`	21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`
22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`	22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`
23	`* IN THE SOFTWARE.`	23	`* IN THE SOFTWARE.`
24	`*/`	24	`*/`
25		25
26	`#include <dos.h>`	26	`#include <dos.h>`
27	`#include <fcntl.h>`	27	`#include <fcntl.h>`
28	`#include <stdlib.h>`	28	`#include <stdlib.h>`
29	`#include <string.h>`	29	`#include <string.h>`
30	`#include <malloc.h> /* _fcalloc() */`	30	`#include <malloc.h> /* _fcalloc() */`
31		31
32	`#include "mdr\bios.h"`	32	`#include "mdr\bios.h"`
33	`#include "mdr\cout.h"`	33	`#include "mdr\cout.h"`
34	`#include "mdr\dos.h"`	34	`#include "mdr\dos.h"`
35	`#include "mdr\keyb.h"`	35	`#include "mdr\keyb.h"`
36		36
37	`#include "svarlang\svarlang.h"`	37	`#include "svarlang\svarlang.h"`
38		38
39	`#define COL_TXT 0`	39	`#define COL_TXT 0`
40	`#define COL_STATUSBAR1 1`	40	`#define COL_STATUSBAR1 1`
41	`#define COL_STATUSBAR2 2`	41	`#define COL_STATUSBAR2 2`
42	`#define COL_SCROLLBAR 3`	42	`#define COL_SCROLLBAR 3`
43	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	43	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
44	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`	44	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`
45		45
46	`#define SCROLL_CURSOR 0xB1`	46	`#define SCROLL_CURSOR 0xB1`
47		47
48		48
49	`struct line {`	49	`struct line {`
50	`struct line far *prev;`	50	`struct line far *prev;`
51	`struct line far *next;`	51	`struct line far *next;`
52	`unsigned short len;`	52	`unsigned short len;`
53	`char payload[1];`	53	`char payload[1];`
54	`};`	54	`};`
55		55
56	`struct file {`	56	`struct file {`
57	`struct line far *cursor;`	57	`struct line far *cursor;`
58	`unsigned short xoffset;`	58	`unsigned short xoffset;`
-		59	`unsigned char cursorposx;`
-		60	`unsigned char cursorposy;`
59	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	61	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
60	`};`	62	`};`
61		63
62		64
63	`/* returns non-zero on error */`	65	`/* returns non-zero on error */`
64	`static int line_add(struct file db, const char far line) {`	66	`static int line_add(struct file db, const char far line) {`
65	`unsigned short slen;`	67	`unsigned short slen;`
66	`struct line far *l;`	68	`struct line far *l;`
67		69
68	`/* slen = strlen(line) (but for far pointer) */`	70	`/* slen = strlen(line) (but for far pointer) */`
69	`for (slen = 0; line[slen] != 0; slen++);`	71	`for (slen = 0; line[slen] != 0; slen++);`
70		72
71	`/* trim out CR/LF line endings */`	73	`/* trim out CR/LF line endings */`
72	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	74	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
73	`slen -= 2;`	75	`slen -= 2;`
74	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	76	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
75	`slen--;`	77	`slen--;`
76	`}`	78	`}`
77		79
78	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	80	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
79	`if (l == NULL) return(-1);`	81	`if (l == NULL) return(-1);`
80		82
81	`l->prev = db->cursor;`	83	`l->prev = db->cursor;`
82	`if (db->cursor) {`	84	`if (db->cursor) {`
83	`l->next = db->cursor->next;`	85	`l->next = db->cursor->next;`
84	`db->cursor->next = l;`	86	`db->cursor->next = l;`
85	`l->next->prev = l;`	87	`l->next->prev = l;`
86	`}`	88	`}`
87	`db->cursor = l;`	89	`db->cursor = l;`
88	`_fmemcpy(l->payload, line, slen);`	90	`_fmemcpy(l->payload, line, slen);`
89	`l->len = slen;`	91	`l->len = slen;`
90		92
91	`return(0);`	93	`return(0);`
92	`}`	94	`}`
93		95
94		96
95	`static void db_rewind(struct file *db) {`	97	`static void db_rewind(struct file *db) {`
96	`if (db->cursor == NULL) return;`	98	`if (db->cursor == NULL) return;`
97	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	99	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
98	`}`	100	`}`
99		101
100		102
101	`static void load_colorscheme(void) {`	103	`static void load_colorscheme(void) {`
102	`scheme[COL_TXT] = 0x17;`	104	`scheme[COL_TXT] = 0x17;`
103	`scheme[COL_STATUSBAR1] = 0x70;`	105	`scheme[COL_STATUSBAR1] = 0x70;`
104	`scheme[COL_STATUSBAR2] = 0x78;`	106	`scheme[COL_STATUSBAR2] = 0x78;`
105	`scheme[COL_SCROLLBAR] = 0x70;`	107	`scheme[COL_SCROLLBAR] = 0x70;`
106	`}`	108	`}`
107		109
108		110
109	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char fname, const struct file db) {`	111	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char fname, const struct file db) {`
110	`unsigned char i;`	112	`unsigned char i;`
111	`const char s = svarlang_strid(0); / HELP */`	113	`const char s = svarlang_strid(0); / HELP */`
112	`unsigned char helpcol = screenw - (strlen(s) + 4);`	114	`unsigned char helpcol = screenw - (strlen(s) + 4);`
113		115
114	`/* fill status bar with background */`	116	`/* fill status bar with background */`
115	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`	117	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`
116		118
117	`/* filename */`	119	`/* filename */`
118	`mdr_cout_str(screenh - 1, 0, fname, scheme[COL_STATUSBAR1], screenw);`	120	`mdr_cout_str(screenh - 1, 0, fname, scheme[COL_STATUSBAR1], screenw);`
119		121
120	`/* eol type */`	122	`/* eol type */`
121	`if (db->lfonly) {`	123	`if (db->lfonly) {`
122	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`	124	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`
123	`} else {`	125	`} else {`
124	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`	126	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`
125	`}`	127	`}`
126		128
127	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	129	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
128	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	130	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
129		131
130	`/* scroll bar */`	132	`/* scroll bar */`
131	`for (i = 0; i < (screenh - 1); i++) {`	133	`for (i = 0; i < (screenh - 1); i++) {`
132	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	134	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
133	`}`	135	`}`
134	`}`	136	`}`
135		137
136		138
137	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	139	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
138	`unsigned short x, y, msglen, i;`	140	`unsigned short x, y, msglen, i;`
139	`msglen = strlen(msg);`	141	`msglen = strlen(msg);`
140	`y = (screenh - 4) >> 1;`	142	`y = (screenh - 4) >> 1;`
141	`x = (screenw - msglen - 4) >> 1;`	143	`x = (screenw - msglen - 4) >> 1;`
142	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);`	144	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);`
143	`mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);`	145	`mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);`
144		146
145	`if (uidirtyfrom > y) uidirtyfrom = y;`	147	`if (uidirtyfrom > y) uidirtyfrom = y;`
146	`if (uidirtyto < y+2) uidirtyto = y+2;`	148	`if (uidirtyto < y+2) uidirtyto = y+2;`
147	`}`	149	`}`
148		150
149		151
150	`static void ui_help(unsigned char screenw) {`	152	`static void ui_help(unsigned char screenw) {`
151	`#define MAXLINLEN 35`	153	`#define MAXLINLEN 35`
152	`unsigned short i, offset;`	154	`unsigned short i, offset;`
153	`offset = (screenw - MAXLINLEN + 1) >> 1;`	155	`offset = (screenw - MAXLINLEN + 1) >> 1;`
154	`mdr_cout_cursor_hide();`	156	`mdr_cout_cursor_hide();`
155	`for (i = 2; i <= 12; i++) {`	157	`for (i = 2; i <= 12; i++) {`
156	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`	158	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`
157	`}`	159	`}`
158		160
159	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	161	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
160	`for (i = 0; i <= 2; i++) {`	162	`for (i = 0; i <= 2; i++) {`
161	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	163	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
162	`}`	164	`}`
163	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	165	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
164	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	166	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
165		167
166	`keyb_getkey();`	168	`keyb_getkey();`
167	`mdr_cout_cursor_show();`	169	`mdr_cout_cursor_show();`
168	`#undef MAXLINLEN`	170	`#undef MAXLINLEN`
169	`}`	171	`}`
170		172
171		173
172	`static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto, unsigned char y) {`	174	`static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
173	`unsigned char len;`	175	`unsigned char len;`
174	`const struct line far *l;`	176	`const struct line far *l;`
-		177	`unsigned char y = db->cursorposy;`
175		178
176	`#ifdef DBG_REFRESH`	179	`#ifdef DBG_REFRESH`
177	`static char m = 'a';`	180	`static char m = 'a';`
178	`m++;`	181	`m++;`
179	`if (m > 'z') m = 'a';`	182	`if (m > 'z') m = 'a';`
180	`#endif`	183	`#endif`
181		184
182	`/* rewind cursor line to first line that needs redrawing */`	185	`/* rewind cursor line to first line that needs redrawing */`
183	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`	186	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`
184		187
185	`/* iterate over lines and redraw whatever needs to be redrawn */`	188	`/* iterate over lines and redraw whatever needs to be redrawn */`
186	`for (; l != NULL; l = l->next, y++) {`	189	`for (; l != NULL; l = l->next, y++) {`
187		190
188	`/* skip lines that do not need to be refreshed */`	191	`/* skip lines that do not need to be refreshed */`
189	`if (y < uidirtyfrom) continue;`	192	`if (y < uidirtyfrom) continue;`
190	`if (y > uidirtyto) break;`	193	`if (y > uidirtyto) break;`
191		194
192	`if (db->xoffset < l->len) {`	195	`if (db->xoffset < l->len) {`
193	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`	196	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`
194	`} else {`	197	`} else {`
195	`len = 0;`	198	`len = 0;`
196	`}`	199	`}`
197	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`	200	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`
198		201
199	`#ifdef DBG_REFRESH`	202	`#ifdef DBG_REFRESH`
200	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	203	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
201	`#endif`	204	`#endif`
202		205
203	`if (y == screenh - 2) break;`	206	`if (y == screenh - 2) break;`
204	`}`	207	`}`
205		208
206	`}`	209	`}`
207		210
208		211
209	`static void check_cursor_not_after_eol(struct file db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	212	`static void check_cursor_not_after_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
210	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`	213	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
211		214
212	`if (db->cursor->len < db->xoffset) {`	215	`if (db->cursor->len < db->xoffset) {`
213	`*cursorpos = 0;`	216	`db->cursorposx = 0;`
214	`db->xoffset = db->cursor->len;`	217	`db->xoffset = db->cursor->len;`
215	`*uidirtyfrom = 0;`	218	`*uidirtyfrom = 0;`
216	`*uidirtyto = 0xff;`	219	`*uidirtyto = 0xff;`
217	`} else {`	220	`} else {`
218	`*cursorpos = db->cursor->len - db->xoffset;`	221	`db->cursorposx = db->cursor->len - db->xoffset;`
219	`}`	222	`}`
220	`}`	223	`}`
221		224
222		225
223	`static void cursor_up(struct file db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	226	`static void cursor_up(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
224	`if (db->cursor->prev != NULL) {`	227	`if (db->cursor->prev != NULL) {`
225	`db->cursor = db->cursor->prev;`	228	`db->cursor = db->cursor->prev;`
226	`if (*cursorposy == 0) {`	229	`if (db->cursorposy == 0) {`
227	`*uidirtyfrom = 0;`	230	`*uidirtyfrom = 0;`
228	`*uidirtyto = 0xff;`	231	`*uidirtyto = 0xff;`
229	`} else {`	232	`} else {`
230	`*cursorposy -= 1;`	233	`db->cursorposy -= 1;`
231	`}`	234	`}`
232	`}`	235	`}`
233	`}`	236	`}`
234		237
235		238
236	`static void cursor_eol(struct file db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	239	`static void cursor_eol(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
237	`/* adjust xoffset to make sure eol is visible on screen */`	240	`/* adjust xoffset to make sure eol is visible on screen */`
238	`if (db->xoffset > db->cursor->len) {`	241	`if (db->xoffset > db->cursor->len) {`
239	`db->xoffset = db->cursor->len - 1;`	242	`db->xoffset = db->cursor->len - 1;`
240	`*uidirtyfrom = 0;`	243	`*uidirtyfrom = 0;`
241	`*uidirtyto = 0xff;`	244	`*uidirtyto = 0xff;`
242	`}`	245	`}`
243		246
244	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	247	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
245	`db->xoffset = db->cursor->len - screenw + 2;`	248	`db->xoffset = db->cursor->len - screenw + 2;`
246	`*uidirtyfrom = 0;`	249	`*uidirtyfrom = 0;`
247	`*uidirtyto = 0xff;`	250	`*uidirtyto = 0xff;`
248	`}`	251	`}`
249	`*cursorposx = db->cursor->len - db->xoffset;`	252	`db->cursorposx = db->cursor->len - db->xoffset;`
250	`}`	253	`}`
251		254
252		255
253	`static void cursor_down(struct file db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	256	`static void cursor_down(struct file db, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
254	`if (db->cursor->next != NULL) {`	257	`if (db->cursor->next != NULL) {`
255	`db->cursor = db->cursor->next;`	258	`db->cursor = db->cursor->next;`
256	`if (*cursorposy < screenh - 2) {`	259	`if (db->cursorposy < screenh - 2) {`
257	`*cursorposy += 1;`	260	`db->cursorposy += 1;`
258	`} else {`	261	`} else {`
259	`*uidirtyfrom = 0;`	262	`*uidirtyfrom = 0;`
260	`*uidirtyto = 0xff;`	263	`*uidirtyto = 0xff;`
261	`}`	264	`}`
262	`}`	265	`}`
263	`}`	266	`}`
264		267
265		268
266	`static void cursor_left(struct file db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	269	`static void cursor_left(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
267	`if (*cursorposx > 0) {`	270	`if (db->cursorposx > 0) {`
268	`*cursorposx -= 1;`	271	`db->cursorposx -= 1;`
269	`} else if (db->xoffset > 0) {`	272	`} else if (db->xoffset > 0) {`
270	`db->xoffset -= 1;`	273	`db->xoffset -= 1;`
271	`*uidirtyfrom = 0;`	274	`*uidirtyfrom = 0;`
272	`*uidirtyto = 0xff;`	275	`*uidirtyto = 0xff;`
273	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	276	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
274	`cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);`	277	`cursor_up(db, uidirtyfrom, uidirtyto);`
275	`cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);`	278	`cursor_eol(db, screenw, uidirtyfrom, uidirtyto);`
276	`}`	279	`}`
277	`}`	280	`}`
278		281
279		282
280	`static void cursor_home(struct file db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	283	`static void cursor_home(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
281	`*cursorposx = 0;`	284	`db->cursorposx = 0;`
282	`if (db->xoffset != 0) {`	285	`if (db->xoffset != 0) {`
283	`db->xoffset = 0;`	286	`db->xoffset = 0;`
284	`*uidirtyfrom = 0;`	287	`*uidirtyfrom = 0;`
285	`*uidirtyto = 0xff;`	288	`*uidirtyto = 0xff;`
286	`}`	289	`}`
287	`}`	290	`}`
288		291
289		292
290	`static void cursor_right(struct file db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	293	`static void cursor_right(struct file db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
291	`if (db->cursor->len > db->xoffset + *cursorposx) {`	294	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
292	`if (*cursorposx < screenw - 2) {`	295	`if (db->cursorposx < screenw - 2) {`
293	`*cursorposx += 1;`	296	`db->cursorposx += 1;`
294	`} else {`	297	`} else {`
295	`db->xoffset += 1;`	298	`db->xoffset += 1;`
296	`*uidirtyfrom = 0;`	299	`*uidirtyfrom = 0;`
297	`*uidirtyto = 0xff;`	300	`*uidirtyto = 0xff;`
298	`}`	301	`}`
299	`} else {`	302	`} else {`
300	`cursor_down(db, cursorposy, screenh, uidirtyfrom, uidirtyto);`	303	`cursor_down(db, screenh, uidirtyfrom, uidirtyto);`
301	`cursor_home(db, cursorposx, uidirtyfrom, uidirtyto);`	304	`cursor_home(db, uidirtyfrom, uidirtyto);`
302	`}`	305	`}`
303	`}`	306	`}`
304		307
305		308
306	`static void del(struct file db, unsigned char cursorposx, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	309	`static void del(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
307	`if (cursorposx + db->xoffset < db->cursor->len) {`	310	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
308	`_fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);`	311	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
309	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	312	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
310	`*uidirtyfrom = cursorposy;`	313	`*uidirtyfrom = db->cursorposy;`
311	`*uidirtyto = cursorposy;`	314	`*uidirtyto = db->cursorposy;`
312	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	315	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
313	`struct line far *nextline = db->cursor->next;`	316	`struct line far *nextline = db->cursor->next;`
314	`if (db->cursor->next->len > 0) {`	317	`if (db->cursor->next->len > 0) {`
315	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	318	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
316	`if (newptr != NULL) {`	319	`if (newptr != NULL) {`
317	`db->cursor = newptr;`	320	`db->cursor = newptr;`
318	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	321	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
319	`db->cursor->len += db->cursor->next->len;`	322	`db->cursor->len += db->cursor->next->len;`
320	`}`	323	`}`
321	`}`	324	`}`
322	`db->cursor->next = db->cursor->next->next;`	325	`db->cursor->next = db->cursor->next->next;`
323	`db->cursor->next->prev = db->cursor;`	326	`db->cursor->next->prev = db->cursor;`
324	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	327	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
325	`_ffree(nextline);`	328	`_ffree(nextline);`
326	`*uidirtyfrom = cursorposy;`	329	`*uidirtyfrom = db->cursorposy;`
327	`*uidirtyto = 0xff;`	330	`*uidirtyto = 0xff;`
328	`}`	331	`}`
329	`}`	332	`}`
330		333
331		334
332	`static void bkspc(struct file db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	335	`static void bkspc(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
333		336
334	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	337	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
335	`if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	338	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
336		339
337	`cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);`	340	`cursor_left(db, screenw, uidirtyfrom, uidirtyto);`
338	`del(db, cursorposx, cursorposy, uidirtyfrom, uidirtyto);`	341	`del(db, uidirtyfrom, uidirtyto);`
339	`}`	342	`}`
340		343
341		344
342	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	345	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
343	`* of argc and argv, saves some 330 bytes of binary size */`	346	`* of argc and argv, saves some 330 bytes of binary size */`
344	`static char *parseargv(void) {`	347	`static char *parseargv(void) {`
345	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	348	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
346	`unsigned char count = 0;`	349	`unsigned char count = 0;`
347	`char *argv[4];`	350	`char *argv[4];`
348		351
349	`while (count < 4) {`	352	`while (count < 4) {`
350	`/* jump to nearest arg */`	353	`/* jump to nearest arg */`
351	`while (*tail == ' ') {`	354	`while (*tail == ' ') {`
352	`*tail = 0;`	355	`*tail = 0;`
353	`tail++;`	356	`tail++;`
354	`}`	357	`}`
355		358
356	`if (*tail == '\r') {`	359	`if (*tail == '\r') {`
357	`*tail = 0;`	360	`*tail = 0;`
358	`break;`	361	`break;`
359	`}`	362	`}`
360		363
361	`argv[count++] = tail;`	364	`argv[count++] = tail;`
362		365
363	`/* jump to next delimiter */`	366	`/* jump to next delimiter */`
364	`while ((tail != ' ') && (tail != '\r')) tail++;`	367	`while ((tail != ' ') && (tail != '\r')) tail++;`
365	`}`	368	`}`
366		369
367	`/* check args now */`	370	`/* check args now */`
368	`if (count != 1) return(NULL);`	371	`if (count != 1) return(NULL);`
369		372
370	`return(argv[0]);`	373	`return(argv[0]);`
371	`}`	374	`}`
372		375
373		376
374	`static int loadfile(struct file db, const char fname) {`	377	`static int loadfile(struct file db, const char fname) {`
375	`char buff[1024];`	378	`char buff[1024];`
376	`unsigned int prevlen = 0, len, llen;`	379	`unsigned int prevlen = 0, len, llen;`
377	`int fd;`	380	`int fd;`
378	`int r = 0;`	381	`int r = 0;`
379		382
380	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	383	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
381	`mdr_coutraw_puts("Failed to open file:");`	384	`mdr_coutraw_puts("Failed to open file:");`
382	`mdr_coutraw_puts(fname);`	385	`mdr_coutraw_puts(fname);`
383	`return(-1);`	386	`return(-1);`
384	`}`	387	`}`
385		388
386	`db->lfonly = 1;`	389	`db->lfonly = 1;`
387		390
388	`do {`	391	`do {`
389	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`	392	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`
390	`len += prevlen;`	393	`len += prevlen;`
391	`} else {`	394	`} else {`
392	`len = prevlen;`	395	`len = prevlen;`
393	`}`	396	`}`
394		397
395	`/* look for nearest \n and replace with 0*/`	398	`/* look for nearest \n and replace with 0*/`
396	`for (llen = 0; buff[llen] != '\n'; llen++) {`	399	`for (llen = 0; buff[llen] != '\n'; llen++) {`
397	`if (llen == sizeof(buff)) break;`	400	`if (llen == sizeof(buff)) break;`
398	`}`	401	`}`
399	`buff[llen] = 0;`	402	`buff[llen] = 0;`
400	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`	403	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`
401	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`	404	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`
402	`db->lfonly = 0;`	405	`db->lfonly = 0;`
403	`}`	406	`}`
404	`if (line_add(db, buff) != 0) {`	407	`if (line_add(db, buff) != 0) {`
405	`mdr_coutraw_puts("out of memory");`	408	`mdr_coutraw_puts("out of memory");`
406	`r = -1;`	409	`r = -1;`
407	`break;`	410	`break;`
408	`}`	411	`}`
409		412
410	`len -= llen + 1;`	413	`len -= llen + 1;`
411	`memmove(buff, buff + llen + 1, len);`	414	`memmove(buff, buff + llen + 1, len);`
412	`prevlen = len;`	415	`prevlen = len;`
413	`} while (len > 0);`	416	`} while (len > 0);`
414		417
415	`_dos_close(fd);`	418	`_dos_close(fd);`
416		419
417	`return(r);`	420	`return(r);`
418	`}`	421	`}`
419		422
420		423
421	`static int savefile(const struct file db, const char fname) {`	424	`static int savefile(const struct file db, const char fname) {`
422	`int fd;`	425	`int fd;`
423	`const struct line far *l;`	426	`const struct line far *l;`
424	`unsigned bytes;`	427	`unsigned bytes;`
425	`unsigned char eollen;`	428	`unsigned char eollen;`
426	`unsigned char eolbuf[2];`	429	`unsigned char eolbuf[2];`
427		430
428	`if (_dos_open(fname, O_WRONLY, &fd) != 0) {`	431	`if (_dos_open(fname, O_WRONLY, &fd) != 0) {`
429	`return(-1);`	432	`return(-1);`
430	`}`	433	`}`
431		434
432	`l = db->cursor;`	435	`l = db->cursor;`
433	`while (l->prev) l = l->prev;`	436	`while (l->prev) l = l->prev;`
434		437
435	`/* preset line terminators */`	438	`/* preset line terminators */`
436	`if (db->lfonly) {`	439	`if (db->lfonly) {`
437	`eolbuf[0] = '\n';`	440	`eolbuf[0] = '\n';`
438	`eollen = 1;`	441	`eollen = 1;`
439	`} else {`	442	`} else {`
440	`eolbuf[0] = '\r';`	443	`eolbuf[0] = '\r';`
441	`eolbuf[1] = '\n';`	444	`eolbuf[1] = '\n';`
442	`eollen = 2;`	445	`eollen = 2;`
443	`}`	446	`}`
444		447
445	`while (l) {`	448	`while (l) {`
446	`_dos_write(fd, l->payload, l->len, &bytes);`	449	`_dos_write(fd, l->payload, l->len, &bytes);`
447	`_dos_write(fd, eolbuf, eollen, &bytes);`	450	`_dos_write(fd, eolbuf, eollen, &bytes);`
448	`l = l->next;`	451	`l = l->next;`
449	`}`	452	`}`
450		453
451	`_dos_close(fd);`	454	`_dos_close(fd);`
452	`return(0);`	455	`return(0);`
453	`}`	456	`}`
454		457
455		458
456	`int main(void) {`	459	`int main(void) {`
457	`const char *fname;`	460	`const char *fname;`
458	`struct file db;`	461	`struct file db;`
459	`unsigned char screenw = 0, screenh = 0;`	462	`unsigned char screenw = 0, screenh = 0;`
460	`unsigned char cursorposx = 0, cursorposy = 0;`	-
461	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`	463	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`
462		464
463	`bzero(&db, sizeof(db));`	465	`bzero(&db, sizeof(db));`
464		466
465	`{`	467	`{`
466	`char nlspath[128], lang[8];`	468	`char nlspath[128], lang[8];`
467	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`	469	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`
468	`}`	470	`}`
469		471
470	`fname = parseargv();`	472	`fname = parseargv();`
471		473
472	`if (fname == NULL) {`	474	`if (fname == NULL) {`
473	`mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */`	475	`mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */`
474	`return(0);`	476	`return(0);`
475	`}`	477	`}`
476		478
477	`/* load file */`	479	`/* load file */`
478	`if (loadfile(&db, fname) != 0) return(1);`	480	`if (loadfile(&db, fname) != 0) return(1);`
479		481
480	`/* add an empty line at end if not present already */`	482	`/* add an empty line at end if not present already */`
481	`if (db.cursor->len != 0) line_add(&db, "");`	483	`if (db.cursor->len != 0) line_add(&db, "");`
482		484
483	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`	485	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`
484	`ui_basic(screenw, screenh, fname, &db);`	486	`ui_basic(screenw, screenh, fname, &db);`
485		487
486	`db_rewind(&db);`	488	`db_rewind(&db);`
487		489
488	`for (;;) {`	490	`for (;;) {`
489	`int k;`	491	`int k;`
490		492
491	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	493	`check_cursor_not_after_eol(&db, &uidirtyfrom, &uidirtyto);`
492	`mdr_cout_locate(cursorposy, cursorposx);`	494	`mdr_cout_locate(db.cursorposy, db.cursorposx);`
493		495
494	`if (uidirtyfrom != 0xff) {`	496	`if (uidirtyfrom != 0xff) {`
495	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto, cursorposy);`	497	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);`
496	`uidirtyfrom = 0xff;`	498	`uidirtyfrom = 0xff;`
497	`}`	499	`}`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1767 – Rev 1315 → 1316