Subversion Repositories SvarDOS

Rev

Rev 392 | Rev 397 | Go to most recent revision | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 392 Rev 396
Line 1... Line 1...
1 
/*
1 
/*
2 
 * a variety of helper functions
2 
 * a variety of helper functions
3 
 * Copyright (C) 2021 Mateusz Viste
3 
 * Copyright (C) 2021 Mateusz Viste
4 
 */
 4 
 */
5 
 
 5 
 
- 
 
 6 
#include <i86.h>    /* MK_FP() */
- 
 
 7 
 
6 
#include "helpers.h"
 8 
#include "helpers.h"
7 
 
 9 
 
8 
/* case-insensitive comparison of strings, returns non-zero on equality */
 10 
/* case-insensitive comparison of strings, returns non-zero on equality */
9 
int imatch(const char *s1, const char *s2) {
 11 
int imatch(const char *s1, const char *s2) {
10 
  for (;;) {
 12 
  for (;;) {
Line 167... Line 169...
167 
    mov [res], cx
 169 
    mov [res], cx
168 
    DONE:
 170 
    DONE:
169 
  }
 171 
  }
170 
  return(res);
 172 
  return(res);
171 
}
 173 
}
- 
 
 174 
 
- 
 
 175 
 
- 
 
 176 
/* returns screen's width (in columns) */
- 
 
 177 
unsigned short screen_getwidth(void) {
- 
 
 178 
  /* BIOS 0040:004A = word containing screen width in text columns */
- 
 
 179 
  unsigned short far *scrw = MK_FP(0x40, 0x4a);
- 
 
 180 
  return(*scrw);
- 
 
 181 
}
- 
 
 182 
 
- 
 
 183 
 
- 
 
 184 
/* returns screen's height (in rows) */
- 
 
 185 
unsigned short screen_getheight(void) {
- 
 
 186 
  /* BIOS 0040:0084 = byte containing maximum valid row value (EGA ONLY) */
- 
 
 187 
  unsigned char far *scrh = MK_FP(0x40, 0x84);
- 
 
 188 
  if (*scrh == 0) return(25);  /* pre-EGA adapter */
- 
 
 189 
  return(*scrh + 1);
- 
 
 190 
}
- 
 
 191 
 
- 
 
 192 
 
- 
 
 193 
/* displays the "Press any key to continue" msg and waits for a keypress */
- 
 
 194 
void press_any_key(void) {
- 
 
 195 
  output("Press any key to continue...");
- 
 
 196 
  _asm {
- 
 
 197 
    mov ah, 0x08  /* no echo console input */
- 
 
 198 
    int 0x21      /* pressed key in AL now (0 for extended keys) */
- 
 
 199 
    test al, al
- 
 
 200 
    jnz DONE
- 
 
 201 
    int 0x21      /* executed ah=8 again to read the rest of extended key */
- 
 
 202 
    DONE:
- 
 
 203 
    /* output CR/LF */
- 
 
 204 
    mov ah, 0x02
- 
 
 205 
    mov dl, 0x0D
- 
 
 206 
    int 0x21
- 
 
 207 
    mov dl, 0x0A
- 
 
 208 
    int 0x21
- 
 
 209 
  }
- 
 
 210 
}