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\cout.h"
#include "mdr\dos.h"
#include "mdr\keyb.h"
 
#include "svarlang\svarlang.h"
 
#define COL_TXT        0
#define COL_STATUSBAR1 1
#define COL_STATUSBAR2 2
#define COL_SCROLLBAR  3
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};
 
#define SCROLL_CURSOR 0xB1
 
 
struct line {
  struct line far *prev;
  struct line far *next;
  unsigned short len;
  char payload[1];
};
 
struct linedb {
  struct line far *topscreen;
  struct line far *cursor;
  unsigned short xoffset;
};
 
 
/* returns non-zero on error */
static int line_add(struct linedb *db, const char far *line) {
  unsigned short slen;
  struct line far *l;
 
  /* slen = strlen(line) (but for far pointer) */
  for (slen = 0; line[slen] != 0; slen++);
 
  /* trim out CR/LF line endings */
  if ((slen >= 2) && (line[slen - 2] == '\r')) {
    slen -= 2;
  } else if ((slen >= 1) && (line[slen - 1] == '\n')) {
    slen--;
  }
 
  l = _fcalloc(1, sizeof(struct line) + slen + 1);
  if (l == NULL) return(-1);
 
  l->prev = db->cursor;
  if (db->cursor) {
    l->next = db->cursor->next;
    db->cursor->next = l;
    l->next->prev = l;
  }
  db->cursor = l;
  _fmemcpy(l->payload, line, slen);
  l->len = slen;
 
  return(0);
}
 
 
static void db_rewind(struct linedb *db) {
  if (db->cursor == NULL) return;
  while (db->cursor->prev) db->cursor = db->cursor->prev;
  db->topscreen = db->cursor;
}
 
 
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) {
  unsigned char i;
  const char *s = svarlang_strid(0); /* HELP */
  unsigned char helpcol = screenw - (strlen(s) + 4);
 
  /* clear screen */
  mdr_cout_cls(scheme[COL_TXT]);
 
  /* status bar */
  for (i = 0; i < helpcol; i++) {
    mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);
    if (*fname != 0) fname++;
  }
  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_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {
  unsigned char y = 0;
  unsigned char len;
  struct line far *l;
 
#ifdef DBG_REFRESH
  static char m = 'a';
  m++;
  if (m > 'z') m = 'a';
#endif
 
  for (l = db->topscreen; l != NULL; l = l->next, y++) {
 
    /* skip lines that do not to be refreshed */
    if (y < uidirtyfrom) continue;
    if (y > uidirtyto) break;
 
    if (db->xoffset < l->len) {
      for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);
    } else {
      len = 0;
    }
    while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);
 
#ifdef DBG_REFRESH
    mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
#endif
 
    if (y == screenh - 2) break;
  }
}
 
 
static void check_cursor_not_after_eol(struct linedb *db, unsigned char *cursorpos, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->xoffset + *cursorpos <= db->cursor->len) return;
 
  if (db->cursor->len < db->xoffset) {
    *cursorpos = 0;
    db->xoffset = db->cursor->len;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  } else {
    *cursorpos = db->cursor->len - db->xoffset;
  }
}
 
 
static void cursor_up(struct linedb *db, unsigned char *cursorposy, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->prev != NULL) {
    db->cursor = db->cursor->prev;
    if (*cursorposy == 0) {
      db->topscreen = db->cursor;
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    } else {
      *cursorposy -= 1;
    }
  }
}
 
 
static void cursor_eol(struct linedb *db, unsigned char *cursorposx, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  /* adjust xoffset to make sure eol is visible on screen */
  if (db->xoffset > db->cursor->len) {
    db->xoffset = db->cursor->len - 1;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
    db->xoffset = db->cursor->len - screenw + 2;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
  *cursorposx = db->cursor->len - db->xoffset;
}
 
 
static void cursor_down(struct linedb *db, unsigned char *cursorposy, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->next != NULL) {
    db->cursor = db->cursor->next;
    if (*cursorposy < screenh - 2) {
      *cursorposy += 1;
    } else {
      db->topscreen = db->topscreen->next;
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    }
  }
}
 
 
static void cursor_left(struct linedb *db, unsigned char *cursorposx, unsigned char *cursorposy, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (*cursorposx > 0) {
    *cursorposx -= 1;
  } else if (db->xoffset > 0) {
    db->xoffset -= 1;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
    cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);
    cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);
  }
}
 
 
static void cursor_home(struct linedb *db, unsigned char *cursorposx, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  *cursorposx = 0;
  if (db->xoffset != 0) {
    db->xoffset = 0;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
}
 
 
static void del(struct linedb *db, unsigned char cursorposx, unsigned char cursorposy, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (cursorposx + db->xoffset < db->cursor->len) {
    _fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
    *uidirtyfrom = cursorposy;
    *uidirtyto = cursorposy;
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
    struct line far *nextline = db->cursor->next;
    if (db->cursor->next->len > 0) {
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
      if (newptr != NULL) {
        db->cursor = newptr;
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
        db->cursor->len += db->cursor->next->len;
        /* update db->topscreen if needed */
        if (cursorposy == 0) db->topscreen = db->cursor;
      }
    }
    db->cursor->next = db->cursor->next->next;
    db->cursor->next->prev = db->cursor;
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
    _ffree(nextline);
    *uidirtyfrom = cursorposy;
    *uidirtyto = 0xff;
  }
}
 
 
static void bkspc(struct linedb *db, unsigned char *cursorposx, unsigned char *cursorposy, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
  if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
 
  cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);
  del(db, *cursorposx, *cursorposy, uidirtyfrom, uidirtyto);
}
 
 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
 * of argc and argv, saves some 330 bytes of binary size */
static char *parseargv(void) {
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
  unsigned char count = 0;
  char *argv[4];
 
  while (count < 4) {
    /* jump to nearest arg */
    while (*tail == ' ') {
      *tail = 0;
      tail++;
    }
 
    if (*tail == '\r') {
      *tail = 0;
      break;
    }
 
    argv[count++] = tail;
 
    /* jump to next delimiter */
    while ((*tail != ' ') && (*tail != '\r')) tail++;
  }
 
  /* check args now */
  if (count != 1) return(NULL);
 
  return(argv[0]);
}
 
 
static int loadfile(struct linedb *db, const char *fname) {
  char buff[1024];
  unsigned int prevlen = 0, len, llen;
  int fd;
  int r = 0;
 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
    mdr_coutraw_puts("Failed to open file:");
    mdr_coutraw_puts(fname);
    return(-1);
  }
 
  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])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */
    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);
}
 
 
int main(void) {
  const char *fname;
  struct linedb db;
  unsigned char screenw = 0, screenh = 0;
  unsigned char cursorposx = 0, cursorposy = 0;
  unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */
 
  bzero(&db, sizeof(db));
 
  {
    char nlspath[128], lang[8];
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
  }
 
  fname = parseargv();
 
  if (fname == NULL) {
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
    return(0);
  }
 
  /* load file */
  if (loadfile(&db, fname) != 0) return(1);
 
  /* add an empty line at end if not present already */
  if (db.cursor->len != 0) line_add(&db, "");
 
  if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
  ui_basic(screenw, screenh, fname);
 
  db_rewind(&db);
 
  for (;;) {
    int k;
 
    check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
    mdr_cout_locate(cursorposy, cursorposx);
 
    if (uidirtyfrom != 0xff) {
      ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);
      uidirtyfrom = 0xff;
    }
 
    k = keyb_getkey();
 
    if (k == 0x150) { /* down */
      cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x148) { /* up */
      cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14D) { /* right */
      if (db.cursor->len > db.xoffset + cursorposx) {
        if (cursorposx < screenw - 2) {
          cursorposx++;
        } else {
          db.xoffset++;
          uidirtyfrom = 0;
          uidirtyto = 0xff;
        }
      } else {
        cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);
        cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
      }
 
    } else if (k == 0x14B) { /* left */
      cursor_left(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x149) { /* pgup */
      // TODO
 
    } else if (k == 0x151) { /* pgdown */
      // TODO
 
    } else if (k == 0x147) { /* home */
       cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14F) { /* end */
       cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x1B) { /* ESC */
      break;
 
    } else if (k == 0x0D) { /* ENTER */
      /* add a new line */
      if (line_add(&db, db.cursor->payload + db.xoffset + cursorposx) == 0) {
        /* trim the line above */
        db.cursor->prev->len = db.xoffset + cursorposx;
        db.cursor->prev->payload[db.cursor->prev->len] = 0;
        /* move cursor to the (new) line below */
        cursorposx = 0;
        if (cursorposy < screenh - 2) {
          uidirtyfrom = cursorposy;
          cursorposy++;
        } else {
          db.topscreen = db.topscreen->next;
          uidirtyfrom = 0;
        }
        uidirtyto = 0xff;
      } else {
        /* ERROR: OUT OF MEMORY */
      }
 
    } else if (k == 0x153) {  /* DEL */
      del(&db, cursorposx, cursorposy, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x008) { /* BKSPC */
      bkspc(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);
 
    } else { /* 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 1302	Rev 1307
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\cout.h"`	32	`#include "mdr\cout.h"`
-		33	`#include "mdr\dos.h"`
33	`#include "mdr\keyb.h"`	34	`#include "mdr\keyb.h"`
34		35
35	`#include "svarlang\svarlang.h"`	36	`#include "svarlang\svarlang.h"`
36		37
37	`#define COL_TXT 0`	38	`#define COL_TXT 0`
38	`#define COL_STATUSBAR1 1`	39	`#define COL_STATUSBAR1 1`
39	`#define COL_STATUSBAR2 2`	40	`#define COL_STATUSBAR2 2`
40	`#define COL_SCROLLBAR 3`	41	`#define COL_SCROLLBAR 3`
41	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	42	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
42	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`	43	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`
43		44
44	`#define SCROLL_CURSOR 0xB1`	45	`#define SCROLL_CURSOR 0xB1`
45		46
46		47
47	`struct line {`	48	`struct line {`
48	`struct line far *prev;`	49	`struct line far *prev;`
49	`struct line far *next;`	50	`struct line far *next;`
50	`unsigned short len;`	51	`unsigned short len;`
51	`char payload[1];`	52	`char payload[1];`
52	`};`	53	`};`
53		54
54	`struct linedb {`	55	`struct linedb {`
55	`struct line far *topscreen;`	56	`struct line far *topscreen;`
56	`struct line far *cursor;`	57	`struct line far *cursor;`
57	`unsigned short xoffset;`	58	`unsigned short xoffset;`
58	`};`	59	`};`
59		60
60		61
61	`/* returns non-zero on error */`	62	`/* returns non-zero on error */`
62	`static int line_add(struct linedb db, const char far line) {`	63	`static int line_add(struct linedb db, const char far line) {`
63	`unsigned short slen;`	64	`unsigned short slen;`
64	`struct line far *l;`	65	`struct line far *l;`
65		66
66	`/* slen = strlen(line) (but for far pointer) */`	67	`/* slen = strlen(line) (but for far pointer) */`
67	`for (slen = 0; line[slen] != 0; slen++);`	68	`for (slen = 0; line[slen] != 0; slen++);`
68		69
69	`/* trim out CR/LF line endings */`	70	`/* trim out CR/LF line endings */`
70	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	71	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
71	`slen -= 2;`	72	`slen -= 2;`
72	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	73	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
73	`slen--;`	74	`slen--;`
74	`}`	75	`}`
75		76
76	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	77	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
77	`if (l == NULL) return(-1);`	78	`if (l == NULL) return(-1);`
78		79
79	`l->prev = db->cursor;`	80	`l->prev = db->cursor;`
80	`if (db->cursor) {`	81	`if (db->cursor) {`
81	`l->next = db->cursor->next;`	82	`l->next = db->cursor->next;`
82	`db->cursor->next = l;`	83	`db->cursor->next = l;`
83	`l->next->prev = l;`	84	`l->next->prev = l;`
84	`}`	85	`}`
85	`db->cursor = l;`	86	`db->cursor = l;`
86	`_fmemcpy(l->payload, line, slen);`	87	`_fmemcpy(l->payload, line, slen);`
87	`l->len = slen;`	88	`l->len = slen;`
88		89
89	`return(0);`	90	`return(0);`
90	`}`	91	`}`
91		92
92		93
93	`static void db_rewind(struct linedb *db) {`	94	`static void db_rewind(struct linedb *db) {`
94	`if (db->cursor == NULL) return;`	95	`if (db->cursor == NULL) return;`
95	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	96	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
96	`db->topscreen = db->cursor;`	97	`db->topscreen = db->cursor;`
97	`}`	98	`}`
98		99
99		100
100	`static void load_colorscheme(void) {`	101	`static void load_colorscheme(void) {`
101	`scheme[COL_TXT] = 0x17;`	102	`scheme[COL_TXT] = 0x17;`
102	`scheme[COL_STATUSBAR1] = 0x70;`	103	`scheme[COL_STATUSBAR1] = 0x70;`
103	`scheme[COL_STATUSBAR2] = 0x78;`	104	`scheme[COL_STATUSBAR2] = 0x78;`
104	`scheme[COL_SCROLLBAR] = 0x70;`	105	`scheme[COL_SCROLLBAR] = 0x70;`
105	`}`	106	`}`
106		107
107		108
108	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {`	109	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {`
109	`unsigned char i;`	110	`unsigned char i;`
110	`const char s = svarlang_strid(0); / HELP */`	111	`const char s = svarlang_strid(0); / HELP */`
111	`unsigned char helpcol = screenw - (strlen(s) + 4);`	112	`unsigned char helpcol = screenw - (strlen(s) + 4);`
112		113
113	`/* clear screen */`	114	`/* clear screen */`
114	`mdr_cout_cls(scheme[COL_TXT]);`	115	`mdr_cout_cls(scheme[COL_TXT]);`
115		116
116	`/* status bar */`	117	`/* status bar */`
117	`for (i = 0; i < helpcol; i++) {`	118	`for (i = 0; i < helpcol; i++) {`
118	`mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);`	119	`mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);`
119	`if (*fname != 0) fname++;`	120	`if (*fname != 0) fname++;`
120	`}`	121	`}`
121	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	122	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
122	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	123	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
123		124
124	`/* scroll bar */`	125	`/* scroll bar */`
125	`for (i = 0; i < (screenh - 1); i++) {`	126	`for (i = 0; i < (screenh - 1); i++) {`
126	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	127	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
127	`}`	128	`}`
128	`}`	129	`}`
129		130
130		131
131	`static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	132	`static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
132	`unsigned char y = 0;`	133	`unsigned char y = 0;`
133	`unsigned char len;`	134	`unsigned char len;`
134	`struct line far *l;`	135	`struct line far *l;`
135		136
136	`#ifdef DBG_REFRESH`	137	`#ifdef DBG_REFRESH`
137	`static char m = 'a';`	138	`static char m = 'a';`
138	`m++;`	139	`m++;`
139	`if (m > 'z') m = 'a';`	140	`if (m > 'z') m = 'a';`
140	`#endif`	141	`#endif`
141		142
142	`for (l = db->topscreen; l != NULL; l = l->next, y++) {`	143	`for (l = db->topscreen; l != NULL; l = l->next, y++) {`
143		144
144	`/* skip lines that do not to be refreshed */`	145	`/* skip lines that do not to be refreshed */`
145	`if (y < uidirtyfrom) continue;`	146	`if (y < uidirtyfrom) continue;`
146	`if (y > uidirtyto) break;`	147	`if (y > uidirtyto) break;`
147		148
148	`if (db->xoffset < l->len) {`	149	`if (db->xoffset < l->len) {`
149	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`	150	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`
150	`} else {`	151	`} else {`
151	`len = 0;`	152	`len = 0;`
152	`}`	153	`}`
153	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`	154	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`
154		155
155	`#ifdef DBG_REFRESH`	156	`#ifdef DBG_REFRESH`
156	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	157	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
157	`#endif`	158	`#endif`
158		159
159	`if (y == screenh - 2) break;`	160	`if (y == screenh - 2) break;`
160	`}`	161	`}`
161	`}`	162	`}`
162		163
163		164
164	`static void check_cursor_not_after_eol(struct linedb db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	165	`static void check_cursor_not_after_eol(struct linedb db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
165	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`	166	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`
166		167
167	`if (db->cursor->len < db->xoffset) {`	168	`if (db->cursor->len < db->xoffset) {`
168	`*cursorpos = 0;`	169	`*cursorpos = 0;`
169	`db->xoffset = db->cursor->len;`	170	`db->xoffset = db->cursor->len;`
170	`*uidirtyfrom = 0;`	171	`*uidirtyfrom = 0;`
171	`*uidirtyto = 0xff;`	172	`*uidirtyto = 0xff;`
172	`} else {`	173	`} else {`
173	`*cursorpos = db->cursor->len - db->xoffset;`	174	`*cursorpos = db->cursor->len - db->xoffset;`
174	`}`	175	`}`
175	`}`	176	`}`
176		177
177		178
178	`static void cursor_up(struct linedb db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	179	`static void cursor_up(struct linedb db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
179	`if (db->cursor->prev != NULL) {`	180	`if (db->cursor->prev != NULL) {`
180	`db->cursor = db->cursor->prev;`	181	`db->cursor = db->cursor->prev;`
181	`if (*cursorposy == 0) {`	182	`if (*cursorposy == 0) {`
182	`db->topscreen = db->cursor;`	183	`db->topscreen = db->cursor;`
183	`*uidirtyfrom = 0;`	184	`*uidirtyfrom = 0;`
184	`*uidirtyto = 0xff;`	185	`*uidirtyto = 0xff;`
185	`} else {`	186	`} else {`
186	`*cursorposy -= 1;`	187	`*cursorposy -= 1;`
187	`}`	188	`}`
188	`}`	189	`}`
189	`}`	190	`}`
190		191
191		192
192	`static void cursor_eol(struct linedb db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	193	`static void cursor_eol(struct linedb db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
193	`/* adjust xoffset to make sure eol is visible on screen */`	194	`/* adjust xoffset to make sure eol is visible on screen */`
194	`if (db->xoffset > db->cursor->len) {`	195	`if (db->xoffset > db->cursor->len) {`
195	`db->xoffset = db->cursor->len - 1;`	196	`db->xoffset = db->cursor->len - 1;`
196	`*uidirtyfrom = 0;`	197	`*uidirtyfrom = 0;`
197	`*uidirtyto = 0xff;`	198	`*uidirtyto = 0xff;`
198	`}`	199	`}`
199		200
200	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	201	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
201	`db->xoffset = db->cursor->len - screenw + 2;`	202	`db->xoffset = db->cursor->len - screenw + 2;`
202	`*uidirtyfrom = 0;`	203	`*uidirtyfrom = 0;`
203	`*uidirtyto = 0xff;`	204	`*uidirtyto = 0xff;`
204	`}`	205	`}`
205	`*cursorposx = db->cursor->len - db->xoffset;`	206	`*cursorposx = db->cursor->len - db->xoffset;`
206	`}`	207	`}`
207		208
208		209
209	`static void cursor_down(struct linedb db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	210	`static void cursor_down(struct linedb db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
210	`if (db->cursor->next != NULL) {`	211	`if (db->cursor->next != NULL) {`
211	`db->cursor = db->cursor->next;`	212	`db->cursor = db->cursor->next;`
212	`if (*cursorposy < screenh - 2) {`	213	`if (*cursorposy < screenh - 2) {`
213	`*cursorposy += 1;`	214	`*cursorposy += 1;`
214	`} else {`	215	`} else {`
215	`db->topscreen = db->topscreen->next;`	216	`db->topscreen = db->topscreen->next;`
216	`*uidirtyfrom = 0;`	217	`*uidirtyfrom = 0;`
217	`*uidirtyto = 0xff;`	218	`*uidirtyto = 0xff;`
218	`}`	219	`}`
219	`}`	220	`}`
220	`}`	221	`}`
221		222
222		223
223	`static void cursor_left(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	224	`static void cursor_left(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
224	`if (*cursorposx > 0) {`	225	`if (*cursorposx > 0) {`
225	`*cursorposx -= 1;`	226	`*cursorposx -= 1;`
226	`} else if (db->xoffset > 0) {`	227	`} else if (db->xoffset > 0) {`
227	`db->xoffset -= 1;`	228	`db->xoffset -= 1;`
228	`*uidirtyfrom = 0;`	229	`*uidirtyfrom = 0;`
229	`*uidirtyto = 0xff;`	230	`*uidirtyto = 0xff;`
230	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	231	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
231	`cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);`	232	`cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);`
232	`cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);`	233	`cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);`
233	`}`	234	`}`
234	`}`	235	`}`
235		236
236		237
237	`static void cursor_home(struct linedb db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	238	`static void cursor_home(struct linedb db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
238	`*cursorposx = 0;`	239	`*cursorposx = 0;`
239	`if (db->xoffset != 0) {`	240	`if (db->xoffset != 0) {`
240	`db->xoffset = 0;`	241	`db->xoffset = 0;`
241	`*uidirtyfrom = 0;`	242	`*uidirtyfrom = 0;`
242	`*uidirtyto = 0xff;`	243	`*uidirtyto = 0xff;`
243	`}`	244	`}`
244	`}`	245	`}`
245		246
246		247
247	`static void del(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	248	`static void del(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
248	`if (cursorposx + db->xoffset < db->cursor->len) {`	249	`if (cursorposx + db->xoffset < db->cursor->len) {`
249	`_fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);`	250	`_fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);`
250	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	251	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
251	`*uidirtyfrom = cursorposy;`	252	`*uidirtyfrom = cursorposy;`
252	`*uidirtyto = cursorposy;`	253	`*uidirtyto = cursorposy;`
253	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	254	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
254	`struct line far *nextline = db->cursor->next;`	255	`struct line far *nextline = db->cursor->next;`
255	`if (db->cursor->next->len > 0) {`	256	`if (db->cursor->next->len > 0) {`
256	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	257	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
257	`if (newptr != NULL) {`	258	`if (newptr != NULL) {`
258	`db->cursor = newptr;`	259	`db->cursor = newptr;`
259	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	260	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
260	`db->cursor->len += db->cursor->next->len;`	261	`db->cursor->len += db->cursor->next->len;`
261	`/* update db->topscreen if needed */`	262	`/* update db->topscreen if needed */`
262	`if (cursorposy == 0) db->topscreen = db->cursor;`	263	`if (cursorposy == 0) db->topscreen = db->cursor;`
263	`}`	264	`}`
264	`}`	265	`}`
265	`db->cursor->next = db->cursor->next->next;`	266	`db->cursor->next = db->cursor->next->next;`
266	`db->cursor->next->prev = db->cursor;`	267	`db->cursor->next->prev = db->cursor;`
267	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	268	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
268	`_ffree(nextline);`	269	`_ffree(nextline);`
269	`*uidirtyfrom = cursorposy;`	270	`*uidirtyfrom = cursorposy;`
270	`*uidirtyto = 0xff;`	271	`*uidirtyto = 0xff;`
271	`}`	272	`}`
272	`}`	273	`}`
273		274
274		275
275	`static void bkspc(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	276	`static void bkspc(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
276		277
277	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	278	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
278	`if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	279	`if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
279		280
280	`cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);`	281	`cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);`
281	`del(db, cursorposx, cursorposy, uidirtyfrom, uidirtyto);`	282	`del(db, cursorposx, cursorposy, uidirtyfrom, uidirtyto);`
282	`}`	283	`}`
283		284
284		285
285	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	286	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
286	`* of argc and argv, saves some 330 bytes of binary size */`	287	`* of argc and argv, saves some 330 bytes of binary size */`
287	`static char *parseargv(void) {`	288	`static char *parseargv(void) {`
288	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	289	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
289	`unsigned char count = 0;`	290	`unsigned char count = 0;`
290	`char *argv[4];`	291	`char *argv[4];`
291		292
292	`while (count < 4) {`	293	`while (count < 4) {`
293	`/* jump to nearest arg */`	294	`/* jump to nearest arg */`
294	`while (*tail == ' ') {`	295	`while (*tail == ' ') {`
295	`*tail = 0;`	296	`*tail = 0;`
296	`tail++;`	297	`tail++;`
297	`}`	298	`}`
298		299
299	`if (*tail == '\r') {`	300	`if (*tail == '\r') {`
300	`*tail = 0;`	301	`*tail = 0;`
301	`break;`	302	`break;`
302	`}`	303	`}`
303		304
304	`argv[count++] = tail;`	305	`argv[count++] = tail;`
305		306
306	`/* jump to next delimiter */`	307	`/* jump to next delimiter */`
307	`while ((tail != ' ') && (tail != '\r')) tail++;`	308	`while ((tail != ' ') && (tail != '\r')) tail++;`
308	`}`	309	`}`
309		310
310	`/* check args now */`	311	`/* check args now */`
311	`if (count != 1) return(NULL);`	312	`if (count != 1) return(NULL);`
312		313
313	`return(argv[0]);`	314	`return(argv[0]);`
314	`}`	315	`}`
315		316
316		317
317	`static int loadfile(struct linedb db, const char fname) {`	318	`static int loadfile(struct linedb db, const char fname) {`
318	`char buff[1024];`	319	`char buff[1024];`
319	`unsigned int prevlen = 0, len, llen;`	320	`unsigned int prevlen = 0, len, llen;`
320	`int fd;`	321	`int fd;`
321	`int r = 0;`	322	`int r = 0;`
322		323
323	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	324	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
324	`mdr_coutraw_puts("Failed to open file:");`	325	`mdr_coutraw_puts("Failed to open file:");`
325	`mdr_coutraw_puts(fname);`	326	`mdr_coutraw_puts(fname);`
326	`return(-1);`	327	`return(-1);`
327	`}`	328	`}`
328		329
329	`do {`	330	`do {`
330	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`	331	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`
331	`len += prevlen;`	332	`len += prevlen;`
332	`} else {`	333	`} else {`
333	`len = prevlen;`	334	`len = prevlen;`
334	`}`	335	`}`
335		336
336	`/* look for nearest \n and replace with 0*/`	337	`/* look for nearest \n and replace with 0*/`
337	`for (llen = 0; buff[llen] != '\n'; llen++) {`	338	`for (llen = 0; buff[llen] != '\n'; llen++) {`
338	`if (llen == sizeof(buff)) break;`	339	`if (llen == sizeof(buff)) break;`
339	`}`	340	`}`
340	`buff[llen] = 0;`	341	`buff[llen] = 0;`
341	`if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`	342	`if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`
342	`if (line_add(db, buff) != 0) {`	343	`if (line_add(db, buff) != 0) {`
343	`mdr_coutraw_puts("out of memory");`	344	`mdr_coutraw_puts("out of memory");`
344	`r = -1;`	345	`r = -1;`
345	`break;`	346	`break;`
346	`}`	347	`}`
347		348
348	`len -= llen + 1;`	349	`len -= llen + 1;`
349	`memmove(buff, buff + llen + 1, len);`	350	`memmove(buff, buff + llen + 1, len);`
350	`prevlen = len;`	351	`prevlen = len;`
351	`} while (len > 0);`	352	`} while (len > 0);`
352		353
353	`_dos_close(fd);`	354	`_dos_close(fd);`
354		355
355	`return(r);`	356	`return(r);`
356	`}`	357	`}`
357		358
358		359
359	`int main(void) {`	360	`int main(void) {`
360	`const char *fname;`	361	`const char *fname;`
361	`struct linedb db;`	362	`struct linedb db;`
362	`unsigned char screenw = 0, screenh = 0;`	363	`unsigned char screenw = 0, screenh = 0;`
363	`unsigned char cursorposx = 0, cursorposy = 0;`	364	`unsigned char cursorposx = 0, cursorposy = 0;`
364	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`	365	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`
365		366
366	`bzero(&db, sizeof(db));`	367	`bzero(&db, sizeof(db));`
367		368
-		369	`{`
368	`svarlang_autoload_nlspath("sved");`	370	`char nlspath[128], lang[8];`
-		371	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`
-		372	`}`
369		373
370	`fname = parseargv();`	374	`fname = parseargv();`
371		375
372	`if (fname == NULL) {`	376	`if (fname == NULL) {`
373	`mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */`	377	`mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */`
374	`return(0);`	378	`return(0);`
375	`}`	379	`}`
376		380
377	`/* load file */`	381	`/* load file */`
378	`if (loadfile(&db, fname) != 0) return(1);`	382	`if (loadfile(&db, fname) != 0) return(1);`
379		383
380	`/* add an empty line at end if not present already */`	384	`/* add an empty line at end if not present already */`
381	`if (db.cursor->len != 0) line_add(&db, "");`	385	`if (db.cursor->len != 0) line_add(&db, "");`
382		386
383	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`	387	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`
384	`ui_basic(screenw, screenh, fname);`	388	`ui_basic(screenw, screenh, fname);`
385		389
386	`db_rewind(&db);`	390	`db_rewind(&db);`
387		391
388	`for (;;) {`	392	`for (;;) {`
389	`int k;`	393	`int k;`
390		394
391	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	395	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
392	`mdr_cout_locate(cursorposy, cursorposx);`	396	`mdr_cout_locate(cursorposy, cursorposx);`
393		397
394	`if (uidirtyfrom != 0xff) {`	398	`if (uidirtyfrom != 0xff) {`
395	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);`	399	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);`
396	`uidirtyfrom = 0xff;`	400	`uidirtyfrom = 0xff;`
397	`}`	401	`}`
398		402
399	`k = keyb_getkey();`	403	`k = keyb_getkey();`
400		404
401	`if (k == 0x150) { /* down */`	405	`if (k == 0x150) { /* down */`
402	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`	406	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`
403		407
404	`} else if (k == 0x148) { /* up */`	408	`} else if (k == 0x148) { /* up */`
405	`cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);`	409	`cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);`
406		410
407	`} else if (k == 0x14D) { /* right */`	411	`} else if (k == 0x14D) { /* right */`
408	`if (db.cursor->len > db.xoffset + cursorposx) {`	412	`if (db.cursor->len > db.xoffset + cursorposx) {`
409	`if (cursorposx < screenw - 2) {`	413	`if (cursorposx < screenw - 2) {`
410	`cursorposx++;`	414	`cursorposx++;`
411	`} else {`	415	`} else {`
412	`db.xoffset++;`	416	`db.xoffset++;`
413	`uidirtyfrom = 0;`	417	`uidirtyfrom = 0;`
414	`uidirtyto = 0xff;`	418	`uidirtyto = 0xff;`
415	`}`	419	`}`
416	`} else {`	420	`} else {`
417	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`	421	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`
418	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	422	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
419	`}`	423	`}`
420		424
421	`} else if (k == 0x14B) { /* left */`	425	`} else if (k == 0x14B) { /* left */`
422	`cursor_left(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`	426	`cursor_left(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`
423		427
424	`} else if (k == 0x149) { /* pgup */`	428	`} else if (k == 0x149) { /* pgup */`
425	`// TODO`	429	`// TODO`
426		430
427	`} else if (k == 0x151) { /* pgdown */`	431	`} else if (k == 0x151) { /* pgdown */`
428	`// TODO`	432	`// TODO`
429		433
430	`} else if (k == 0x147) { /* home */`	434	`} else if (k == 0x147) { /* home */`
431	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	435	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
432		436
433	`} else if (k == 0x14F) { /* end */`	437	`} else if (k == 0x14F) { /* end */`
434	`cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);`	438	`cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);`
435		439
436	`} else if (k == 0x1B) { /* ESC */`	440	`} else if (k == 0x1B) { /* ESC */`
437	`break;`	441	`break;`
438		442
439	`} else if (k == 0x0D) { /* ENTER */`	443	`} else if (k == 0x0D) { /* ENTER */`
440	`/* add a new line */`	444	`/* add a new line */`
441	`if (line_add(&db, db.cursor->payload + db.xoffset + cursorposx) == 0) {`	445	`if (line_add(&db, db.cursor->payload + db.xoffset + cursorposx) == 0) {`
442	`/* trim the line above */`	446	`/* trim the line above */`
443	`db.cursor->prev->len = db.xoffset + cursorposx;`	447	`db.cursor->prev->len = db.xoffset + cursorposx;`
444	`db.cursor->prev->payload[db.cursor->prev->len] = 0;`	448	`db.cursor->prev->payload[db.cursor->prev->len] = 0;`
445	`/* move cursor to the (new) line below */`	449	`/* move cursor to the (new) line below */`
446	`cursorposx = 0;`	450	`cursorposx = 0;`
447	`if (cursorposy < screenh - 2) {`	451	`if (cursorposy < screenh - 2) {`
448	`uidirtyfrom = cursorposy;`	452	`uidirtyfrom = cursorposy;`
449	`cursorposy++;`	453	`cursorposy++;`
450	`} else {`	454	`} else {`
451	`db.topscreen = db.topscreen->next;`	455	`db.topscreen = db.topscreen->next;`
452	`uidirtyfrom = 0;`	456	`uidirtyfrom = 0;`
453	`}`	457	`}`
454	`uidirtyto = 0xff;`	458	`uidirtyto = 0xff;`
455	`} else {`	459	`} else {`
456	`/* ERROR: OUT OF MEMORY */`	460	`/* ERROR: OUT OF MEMORY */`
457	`}`	461	`}`
458		462
459	`} else if (k == 0x153) { /* DEL */`	463	`} else if (k == 0x153) { /* DEL */`
460	`del(&db, cursorposx, cursorposy, &uidirtyfrom, &uidirtyto);`	464	`del(&db, cursorposx, cursorposy, &uidirtyfrom, &uidirtyto);`
461		465
462	`} else if (k == 0x008) { /* BKSPC */`	466	`} else if (k == 0x008) { /* BKSPC */`
463	`bkspc(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`	467	`bkspc(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`
464		468
465	`} else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */`	469	`} else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */`
466	`char buff[4];`	470	`char buff[4];`
467	`const char *HEX = "0123456789ABCDEF";`	471	`const char *HEX = "0123456789ABCDEF";`
468	`buff[0] = HEX[(k >> 8) & 15];`	472	`buff[0] = HEX[(k >> 8) & 15];`
469	`buff[1] = HEX[(k >> 4) & 15];`	473	`buff[1] = HEX[(k >> 4) & 15];`
470	`buff[2] = HEX[k & 15];`	474	`buff[2] = HEX[k & 15];`
471	`mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);`	475	`mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);`
472	`mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);`	476	`mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);`
473	`keyb_getkey();`	477	`keyb_getkey();`
474	`break;`	478	`break;`
475	`}`	479	`}`
476	`}`	480	`}`
477		481
478	`mdr_cout_close();`	482	`mdr_cout_close();`
479		483
480	`/* TODO free memory */`	484	`/* TODO free memory */`
481		485
482	`return(0);`	486	`return(0);`
483	`}`	487	`}`
484		488

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1309 – Rev 1302 → 1307