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\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 = "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_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;
  }
}
 
 
/* 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));
 
  svarlang_autoload_nlspath("sved");
 
  fname = parseargv();
 
  if (fname == NULL) {
    mdr_coutraw_puts("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 */
      if (cursorposx > 0) {
        cursorposx--;
      } else if (db.xoffset > 0) {
        db.xoffset--;
        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);
      }
 
    } 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 { /* 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 1288	Rev 1289
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\keyb.h"`	33	`#include "mdr\keyb.h"`
34		34
35	`#include "svarlang\svarlang.h"`	35	`#include "svarlang\svarlang.h"`
36		36
37	`#define COL_TXT 0`	37	`#define COL_TXT 0`
38	`#define COL_STATUSBAR1 1`	38	`#define COL_STATUSBAR1 1`
39	`#define COL_STATUSBAR2 2`	39	`#define COL_STATUSBAR2 2`
40	`#define COL_SCROLLBAR 3`	40	`#define COL_SCROLLBAR 3`
41	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	41	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
42	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`	42	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`
43		43
44	`#define SCROLL_CURSOR 0xB1`	44	`#define SCROLL_CURSOR 0xB1`
45		45
46		46
47	`struct line {`	47	`struct line {`
48	`struct line far *prev;`	48	`struct line far *prev;`
49	`struct line far *next;`	49	`struct line far *next;`
50	`unsigned short len;`	50	`unsigned short len;`
51	`char payload[1];`	51	`char payload[1];`
52	`};`	52	`};`
53		53
54	`struct linedb {`	54	`struct linedb {`
55	`struct line far *topscreen;`	55	`struct line far *topscreen;`
56	`struct line far *cursor;`	56	`struct line far *cursor;`
57	`unsigned short xoffset;`	57	`unsigned short xoffset;`
58	`};`	58	`};`
59		59
60		60
61	`/* returns non-zero on error */`	61	`/* returns non-zero on error */`
62	`int line_add(struct linedb db, const char line) {`	62	`static int line_add(struct linedb db, const char far line) {`
63	`unsigned short slen = strlen(line);`	63	`unsigned short slen;`
64	`struct line far *l;`	64	`struct line far *l;`
65		65
-		66	`/* slen = strlen(line) (but for far pointer) */`
-		67	`for (slen = 0; line[slen] != 0; slen++);`
-		68
66	`/* trim out CR/LF line endings */`	69	`/* trim out CR/LF line endings */`
67	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	70	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
68	`slen -= 2;`	71	`slen -= 2;`
69	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	72	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
70	`slen--;`	73	`slen--;`
71	`}`	74	`}`
72		75
73	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	76	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
74	`if (l == NULL) return(-1);`	77	`if (l == NULL) return(-1);`
75		78
76	`l->prev = db->cursor;`	79	`l->prev = db->cursor;`
77	`if (db->cursor) {`	80	`if (db->cursor) {`
78	`l->next = db->cursor->next;`	81	`l->next = db->cursor->next;`
79	`db->cursor->next = l;`	82	`db->cursor->next = l;`
80	`l->next->prev = l;`	83	`l->next->prev = l;`
81	`}`	84	`}`
82	`db->cursor = l;`	85	`db->cursor = l;`
83	`_fmemcpy(l->payload, line, slen);`	86	`_fmemcpy(l->payload, line, slen);`
84	`l->len = slen;`	87	`l->len = slen;`
85		88
86	`return(0);`	89	`return(0);`
87	`}`	90	`}`
88		91
89		92
90	`void db_rewind(struct linedb *db) {`	93	`static void db_rewind(struct linedb *db) {`
91	`if (db->cursor == NULL) return;`	94	`if (db->cursor == NULL) return;`
92	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	95	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
93	`db->topscreen = db->cursor;`	96	`db->topscreen = db->cursor;`
94	`}`	97	`}`
95		98
96		99
97	`void load_colorscheme(void) {`	100	`static void load_colorscheme(void) {`
98	`scheme[COL_TXT] = 0x17;`	101	`scheme[COL_TXT] = 0x17;`
99	`scheme[COL_STATUSBAR1] = 0x70;`	102	`scheme[COL_STATUSBAR1] = 0x70;`
100	`scheme[COL_STATUSBAR2] = 0x78;`	103	`scheme[COL_STATUSBAR2] = 0x78;`
101	`scheme[COL_SCROLLBAR] = 0x70;`	104	`scheme[COL_SCROLLBAR] = 0x70;`
102	`}`	105	`}`
103		106
104		107
105	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {`	108	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {`
106	`unsigned char i;`	109	`unsigned char i;`
107	`const char *s = "HELP";`	110	`const char *s = "HELP";`
108	`unsigned char helpcol = screenw - (strlen(s) + 4);`	111	`unsigned char helpcol = screenw - (strlen(s) + 4);`
109		112
110	`/* clear screen */`	113	`/* clear screen */`
111	`mdr_cout_cls(scheme[COL_TXT]);`	114	`mdr_cout_cls(scheme[COL_TXT]);`
112		115
113	`/* status bar */`	116	`/* status bar */`
114	`for (i = 0; i < helpcol; i++) {`	117	`for (i = 0; i < helpcol; i++) {`
115	`mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);`	118	`mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);`
116	`if (*fname != 0) fname++;`	119	`if (*fname != 0) fname++;`
117	`}`	120	`}`
118	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	121	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
119	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	122	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
120		123
121	`/* scroll bar */`	124	`/* scroll bar */`
122	`for (i = 0; i < (screenh - 1); i++) {`	125	`for (i = 0; i < (screenh - 1); i++) {`
123	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	126	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
124	`}`	127	`}`
125	`}`	128	`}`
126		129
127		130
128	`static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	131	`static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
129	`unsigned char y = 0;`	132	`unsigned char y = 0;`
130	`unsigned char len;`	133	`unsigned char len;`
131	`struct line far *l;`	134	`struct line far *l;`
132		135
133	`#ifdef DBG_REFRESH`	136	`#ifdef DBG_REFRESH`
134	`static char m = 'a';`	137	`static char m = 'a';`
135	`m++;`	138	`m++;`
136	`if (m > 'z') m = 'a';`	139	`if (m > 'z') m = 'a';`
137	`#endif`	140	`#endif`
138		141
139	`for (l = db->topscreen; l != NULL; l = l->next) {`	142	`for (l = db->topscreen; l != NULL; l = l->next, y++) {`
140		143
141	`/* skip lines that do not to be refreshed */`	144	`/* skip lines that do not to be refreshed */`
142	`if ((y < uidirtyfrom) \|\| (y > uidirtyto)) continue;`	145	`if (y < uidirtyfrom) continue;`
-		146	`if (y > uidirtyto) break;`
143		147
144	`if (db->xoffset < l->len) {`	148	`if (db->xoffset < l->len) {`
145	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`	149	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`
146	`} else {`	150	`} else {`
147	`len = 0;`	151	`len = 0;`
148	`}`	152	`}`
149	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`	153	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`
150		154
151	`#ifdef DBG_REFRESH`	155	`#ifdef DBG_REFRESH`
152	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	156	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
153	`#endif`	157	`#endif`
154		158
155	`if (y == screenh - 2) break;`	159	`if (y == screenh - 2) break;`
156	`y++;`	-
157	`}`	160	`}`
158	`}`	161	`}`
159		162
160		163
161	`static void check_cursor_not_after_eol(struct linedb db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	164	`static void check_cursor_not_after_eol(struct linedb db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
162	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`	165	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`
163		166
164	`if (db->cursor->len < db->xoffset) {`	167	`if (db->cursor->len < db->xoffset) {`
165	`*cursorpos = 0;`	168	`*cursorpos = 0;`
166	`db->xoffset = db->cursor->len;`	169	`db->xoffset = db->cursor->len;`
167	`*uidirtyfrom = 0;`	170	`*uidirtyfrom = 0;`
168	`*uidirtyto = 0xff;`	171	`*uidirtyto = 0xff;`
169	`} else {`	172	`} else {`
170	`*cursorpos = db->cursor->len - db->xoffset;`	173	`*cursorpos = db->cursor->len - db->xoffset;`
171	`}`	174	`}`
172	`}`	175	`}`
173		176
174		177
175	`static void cursor_up(struct linedb db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	178	`static void cursor_up(struct linedb db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
176	`if (db->cursor->prev != NULL) {`	179	`if (db->cursor->prev != NULL) {`
177	`db->cursor = db->cursor->prev;`	180	`db->cursor = db->cursor->prev;`
178	`if (*cursorposy == 0) {`	181	`if (*cursorposy == 0) {`
179	`db->topscreen = db->cursor;`	182	`db->topscreen = db->cursor;`
180	`*uidirtyfrom = 0;`	183	`*uidirtyfrom = 0;`
181	`*uidirtyto = 0xff;`	184	`*uidirtyto = 0xff;`
182	`} else {`	185	`} else {`
183	`*cursorposy -= 1;`	186	`*cursorposy -= 1;`
184	`}`	187	`}`
185	`}`	188	`}`
186	`}`	189	`}`
187		190
188		191
189	`static void cursor_eol(struct linedb db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	192	`static void cursor_eol(struct linedb db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
190	`/* adjust xoffset to make sure eol is visible on screen */`	193	`/* adjust xoffset to make sure eol is visible on screen */`
191	`if (db->xoffset > db->cursor->len) {`	194	`if (db->xoffset > db->cursor->len) {`
192	`db->xoffset = db->cursor->len - 1;`	195	`db->xoffset = db->cursor->len - 1;`
193	`*uidirtyfrom = 0;`	196	`*uidirtyfrom = 0;`
194	`*uidirtyto = 0xff;`	197	`*uidirtyto = 0xff;`
195	`}`	198	`}`
196		199
197	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	200	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
198	`db->xoffset = db->cursor->len - screenw + 2;`	201	`db->xoffset = db->cursor->len - screenw + 2;`
199	`*uidirtyfrom = 0;`	202	`*uidirtyfrom = 0;`
200	`*uidirtyto = 0xff;`	203	`*uidirtyto = 0xff;`
201	`}`	204	`}`
202	`*cursorposx = db->cursor->len - db->xoffset;`	205	`*cursorposx = db->cursor->len - db->xoffset;`
203	`}`	206	`}`
204		207
205		208
206	`static void cursor_down(struct linedb db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	209	`static void cursor_down(struct linedb db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
207	`if (db->cursor->next != NULL) {`	210	`if (db->cursor->next != NULL) {`
208	`db->cursor = db->cursor->next;`	211	`db->cursor = db->cursor->next;`
209	`if (*cursorposy < screenh - 2) {`	212	`if (*cursorposy < screenh - 2) {`
210	`*cursorposy += 1;`	213	`*cursorposy += 1;`
211	`} else {`	214	`} else {`
212	`db->topscreen = db->topscreen->next;`	215	`db->topscreen = db->topscreen->next;`
213	`*uidirtyfrom = 0;`	216	`*uidirtyfrom = 0;`
214	`*uidirtyto = 0xff;`	217	`*uidirtyto = 0xff;`
215	`}`	218	`}`
216	`}`	219	`}`
217	`}`	220	`}`
218		221
219		222
220	`static void cursor_home(struct linedb db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	223	`static void cursor_home(struct linedb db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
221	`*cursorposx = 0;`	224	`*cursorposx = 0;`
222	`if (db->xoffset != 0) {`	225	`if (db->xoffset != 0) {`
223	`db->xoffset = 0;`	226	`db->xoffset = 0;`
224	`*uidirtyfrom = 0;`	227	`*uidirtyfrom = 0;`
225	`*uidirtyto = 0xff;`	228	`*uidirtyto = 0xff;`
226	`}`	229	`}`
227	`}`	230	`}`
228		231
229		232
230	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	233	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
231	`* of argc and argv, saves some 330 bytes of binary size */`	234	`* of argc and argv, saves some 330 bytes of binary size */`
232	`static char *parseargv(void) {`	235	`static char *parseargv(void) {`
233	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	236	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
234	`unsigned char count = 0;`	237	`unsigned char count = 0;`
235	`char *argv[4];`	238	`char *argv[4];`
236		239
237	`while (count < 4) {`	240	`while (count < 4) {`
238	`/* jump to nearest arg */`	241	`/* jump to nearest arg */`
239	`while (*tail == ' ') {`	242	`while (*tail == ' ') {`
240	`*tail = 0;`	243	`*tail = 0;`
241	`tail++;`	244	`tail++;`
242	`}`	245	`}`
243		246
244	`if (*tail == '\r') {`	247	`if (*tail == '\r') {`
245	`*tail = 0;`	248	`*tail = 0;`
246	`break;`	249	`break;`
247	`}`	250	`}`
248		251
249	`argv[count++] = tail;`	252	`argv[count++] = tail;`
250		253
251	`/* jump to next delimiter */`	254	`/* jump to next delimiter */`
252	`while ((tail != ' ') && (tail != '\r')) tail++;`	255	`while ((tail != ' ') && (tail != '\r')) tail++;`
253	`}`	256	`}`
254		257
255	`/* check args now */`	258	`/* check args now */`
256	`if (count != 1) return(NULL);`	259	`if (count != 1) return(NULL);`
257		260
258	`return(argv[0]);`	261	`return(argv[0]);`
259	`}`	262	`}`
260		263
261		264
262	`static int loadfile(struct linedb db, const char fname) {`	265	`static int loadfile(struct linedb db, const char fname) {`
263	`char buff[1024];`	266	`char buff[1024];`
264	`unsigned int prevlen = 0, len, llen;`	267	`unsigned int prevlen = 0, len, llen;`
265	`int fd;`	268	`int fd;`
266	`int r = 0;`	269	`int r = 0;`
267		270
268	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	271	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
269	`mdr_coutraw_puts("Failed to open file:");`	272	`mdr_coutraw_puts("Failed to open file:");`
270	`mdr_coutraw_puts(fname);`	273	`mdr_coutraw_puts(fname);`
271	`return(-1);`	274	`return(-1);`
272	`}`	275	`}`
273		276
274	`do {`	277	`do {`
275	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`	278	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`
276	`len += prevlen;`	279	`len += prevlen;`
277	`} else {`	280	`} else {`
278	`len = prevlen;`	281	`len = prevlen;`
279	`}`	282	`}`
280		283
281	`/* look for nearest \n and replace with 0*/`	284	`/* look for nearest \n and replace with 0*/`
282	`for (llen = 0; buff[llen] != '\n'; llen++) {`	285	`for (llen = 0; buff[llen] != '\n'; llen++) {`
283	`if (llen == sizeof(buff)) break;`	286	`if (llen == sizeof(buff)) break;`
284	`}`	287	`}`
285	`buff[llen] = 0;`	288	`buff[llen] = 0;`
286	`if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`	289	`if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`
287	`if (line_add(db, buff) != 0) {`	290	`if (line_add(db, buff) != 0) {`
288	`mdr_coutraw_puts("out of memory");`	291	`mdr_coutraw_puts("out of memory");`
289	`r = -1;`	292	`r = -1;`
290	`break;`	293	`break;`
291	`}`	294	`}`
292		295
293	`len -= llen + 1;`	296	`len -= llen + 1;`
294	`memmove(buff, buff + llen + 1, len);`	297	`memmove(buff, buff + llen + 1, len);`
295	`prevlen = len;`	298	`prevlen = len;`
296	`} while (len > 0);`	299	`} while (len > 0);`
297		300
298	`_dos_close(fd);`	301	`_dos_close(fd);`
299		302
300	`return(r);`	303	`return(r);`
301	`}`	304	`}`
302		305
303		306
304	`int main(void) {`	307	`int main(void) {`
305	`const char *fname;`	308	`const char *fname;`
306	`struct linedb db;`	309	`struct linedb db;`
307	`unsigned char screenw = 0, screenh = 0;`	310	`unsigned char screenw = 0, screenh = 0;`
308	`unsigned char cursorposx = 0, cursorposy = 0;`	311	`unsigned char cursorposx = 0, cursorposy = 0;`
309	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`	312	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`
310		313
311	`bzero(&db, sizeof(db));`	314	`bzero(&db, sizeof(db));`
312		315
313	`svarlang_autoload_nlspath("sved");`	316	`svarlang_autoload_nlspath("sved");`
314		317
315	`fname = parseargv();`	318	`fname = parseargv();`
316		319
317	`if (fname == NULL) {`	320	`if (fname == NULL) {`
318	`mdr_coutraw_puts("usage: sved file.txt");`	321	`mdr_coutraw_puts("usage: sved file.txt");`
319	`return(0);`	322	`return(0);`
320	`}`	323	`}`
321		324
322	`/* load file */`	325	`/* load file */`
323	`if (loadfile(&db, fname) != 0) return(1);`	326	`if (loadfile(&db, fname) != 0) return(1);`
324		327
325	`/* add an empty line at end if not present already */`	328	`/* add an empty line at end if not present already */`
326	`if (db.cursor->len != 0) line_add(&db, "");`	329	`if (db.cursor->len != 0) line_add(&db, "");`
327		330
328	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`	331	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`
329	`ui_basic(screenw, screenh, fname);`	332	`ui_basic(screenw, screenh, fname);`
330		333
331	`db_rewind(&db);`	334	`db_rewind(&db);`
332		335
333	`for (;;) {`	336	`for (;;) {`
334	`int k;`	337	`int k;`
335		338
336	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	339	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
337	`mdr_cout_locate(cursorposy, cursorposx);`	340	`mdr_cout_locate(cursorposy, cursorposx);`
338		341
339	`if (uidirtyfrom != 0xff) {`	342	`if (uidirtyfrom != 0xff) {`
340	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);`	343	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);`
341	`uidirtyfrom = 0xff;`	344	`uidirtyfrom = 0xff;`
342	`}`	345	`}`
343		346
344	`k = keyb_getkey();`	347	`k = keyb_getkey();`
345		348
346	`if (k == 0x150) { /* down */`	349	`if (k == 0x150) { /* down */`
347	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`	350	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`
348		351
349	`} else if (k == 0x148) { /* up */`	352	`} else if (k == 0x148) { /* up */`
350	`cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);`	353	`cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);`
351		354
352	`} else if (k == 0x14D) { /* right */`	355	`} else if (k == 0x14D) { /* right */`
353	`if (db.cursor->len > db.xoffset + cursorposx) {`	356	`if (db.cursor->len > db.xoffset + cursorposx) {`
354	`if (cursorposx < screenw - 2) {`	357	`if (cursorposx < screenw - 2) {`
355	`cursorposx++;`	358	`cursorposx++;`
356	`} else {`	359	`} else {`
357	`db.xoffset++;`	360	`db.xoffset++;`
358	`uidirtyfrom = 0;`	361	`uidirtyfrom = 0;`
359	`uidirtyto = 0xff;`	362	`uidirtyto = 0xff;`
360	`}`	363	`}`
361	`} else {`	364	`} else {`
362	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`	365	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`
363	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	366	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
364	`}`	367	`}`
365		368
366	`} else if (k == 0x14B) { /* left */`	369	`} else if (k == 0x14B) { /* left */`
367	`if (cursorposx > 0) {`	370	`if (cursorposx > 0) {`
368	`cursorposx--;`	371	`cursorposx--;`
369	`} else if (db.xoffset > 0) {`	372	`} else if (db.xoffset > 0) {`
370	`db.xoffset--;`	373	`db.xoffset--;`
371	`uidirtyfrom = 0;`	374	`uidirtyfrom = 0;`
372	`uidirtyto = 0xff;`	375	`uidirtyto = 0xff;`
373	`} else if (db.cursor->prev != NULL) { /* jump to end of line above */`	376	`} else if (db.cursor->prev != NULL) { /* jump to end of line above */`
374	`cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);`	377	`cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);`
375	`cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);`	378	`cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);`
376	`}`	379	`}`
377		380
378	`} else if (k == 0x149) { /* pgup */`	381	`} else if (k == 0x149) { /* pgup */`
379	`// TODO`	382	`// TODO`
380		383
381	`} else if (k == 0x151) { /* pgdown */`	384	`} else if (k == 0x151) { /* pgdown */`
382	`// TODO`	385	`// TODO`
383		386
384	`} else if (k == 0x147) { /* home */`	387	`} else if (k == 0x147) { /* home */`
385	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	388	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
386		389
387	`} else if (k == 0x14F) { /* end */`	390	`} else if (k == 0x14F) { /* end */`
388	`cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);`	391	`cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);`
389		392
390	`} else if (k == 0x1B) { /* ESC */`	393	`} else if (k == 0x1B) { /* ESC */`
391	`break;`	394	`break;`
392		395
-		396	`} else if (k == 0x0D) { /* ENTER */`
-		397	`/* add a new line */`
-		398	`if (line_add(&db, db.cursor->payload + db.xoffset + cursorposx) == 0) {`
-		399	`/* trim the line above */`
-		400	`db.cursor->prev->len = db.xoffset + cursorposx;`
-		401	`db.cursor->prev->payload[db.cursor->prev->len] = 0;`
-		402	`/* move cursor to the (new) line below */`
-		403	`cursorposx = 0;`
-		404	`if (cursorposy < screenh - 2) {`
-		405	`uidirtyfrom = cursorposy;`
-		406	`cursorposy++;`
-		407	`} else {`
-		408	`db.topscreen = db.topscreen->next;`
-		409	`uidirtyfrom = 0;`
-		410	`}`
-		411	`uidirtyto = 0xff;`
-		412	`} else {`
-		413	`/* ERROR: OUT OF MEMORY */`
-		414	`}`
-		415
393	`} else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */`	416	`} else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */`
394	`char buff[4];`	417	`char buff[4];`
395	`const char *HEX = "0123456789ABCDEF";`	418	`const char *HEX = "0123456789ABCDEF";`
396	`buff[0] = HEX[(k >> 8) & 15];`	419	`buff[0] = HEX[(k >> 8) & 15];`
397	`buff[1] = HEX[(k >> 4) & 15];`	420	`buff[1] = HEX[(k >> 4) & 15];`
398	`buff[2] = HEX[k & 15];`	421	`buff[2] = HEX[k & 15];`
399	`mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);`	422	`mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);`
400	`mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);`	423	`mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);`
401	`keyb_getkey();`	424	`keyb_getkey();`
402	`break;`	425	`break;`
403	`}`	426	`}`
404	`}`	427	`}`
405		428
406	`mdr_cout_close();`	429	`mdr_cout_close();`
407		430
408	`/* TODO free memory */`	431	`/* TODO free memory */`
409		432
410	`return(0);`	433	`return(0);`
411	`}`	434	`}`
412		435

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1559 – Rev 1288 → 1289