Subversion Repositories SvarDOS

Rev

Rev 1571 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1556 mateusz.vi 1 
/*
2 
 * replacement for a couple of libc functions
3 
 */
4 
 
5 
#include <i86.h>
6 
#include <stddef.h>
7 
 
8 
#include "libc.h"
9 
 
10 
 
11 
size_t strlen(const char *s) {
1566 mateusz.vi 12 
  const char *ptr = s;
13 
  while (*ptr != 0) ptr++;
14 
  return(ptr - s);
1556 mateusz.vi 15 
}
16 
 
17 
void bzero(void *ptr, size_t len) {
1571 mateusz.vi 18 
  char *p = ptr;
19 
  while (len > 0) {
20 
    *p = 0;
21 
    p++;
22 
    len--;
23 
  }
1556 mateusz.vi 24 
}
25 
 
26 
/* TODO this function does not handle overlapping strings well! */
1568 mateusz.vi 27 
void fmemmove(void far *dst, const void far *src, size_t len) {
1556 mateusz.vi 28 
  while (len-- > 0) {
1568 mateusz.vi 29 
    *(char far *)dst = *(char far *)src;
30 
    dst = (char far *)dst + 1;
31 
    src = (char far *)src + 1;
1556 mateusz.vi 32 
  }
33 
}
34 
 
35 
unsigned short mdr_dos_fclose(unsigned short handle) {
36 
  unsigned short res = 0;
37 
  _asm {
38 
    push bx
39 
 
40 
    mov ah, 0x3e
41 
    mov bx, handle
42 
    int 0x21
43 
    jnc done
44 
    mov res, ax
45 
    done:
46 
 
47 
    pop bx
48 
  }
49 
  return(res);
50 
}
51 
 
52 
 
1557 mateusz.vi 53 
unsigned short mdr_dos_resizeblock(unsigned short siz, unsigned short segn) {
1556 mateusz.vi 54 
  unsigned short res = 0;
55 
 
56 
  _asm {
57 
    push bx
58 
    push es
59 
 
60 
    mov ah, 0x4a
61 
    mov bx, siz
62 
    mov es, segn
63 
    int 0x21
64 
    jnc done
65 
    mov res, ax
66 
 
67 
    done:
68 
 
69 
    pop es
70 
    pop bx
71 
  }
72 
 
73 
  return(res);
74 
}
75 
 
76 
 
77 
unsigned short mdr_dos_read(unsigned short handle, void far *buf, unsigned short count, unsigned short *bytes) {
78 
  unsigned short res = 0;
79 
  unsigned short resax = 0;
80 
  unsigned short buf_off = FP_OFF(buf);
81 
  unsigned short buf_seg = FP_SEG(buf);
82 
 
83 
  _asm {
84 
    push bx,
85 
    push cx
86 
    push dx
87 
 
88 
    mov ah, 0x3f
89 
    mov bx, handle
90 
    mov cx, count
91 
    mov dx, buf_off
92 
    push ds
93 
    mov ds, buf_seg
94 
    int 0x21
95 
    pop ds
96 
 
97 
    jnc done
98 
    mov res, ax
99 
 
100 
    done:
101 
    mov resax, ax
102 
 
103 
    pop dx
104 
    pop cx
105 
    pop bx
106 
  }
107 
 
108 
  *bytes = resax;
109 
  return(res);
110 
}
111 
 
112 
 
113 
unsigned short mdr_dos_write(unsigned short handle, const void far *buf, unsigned short count, unsigned short *bytes) {
114 
  unsigned short res = 0;
115 
  unsigned short resax = 0;
116 
  unsigned short buf_seg = FP_SEG(buf);
117 
  unsigned short buf_off = FP_OFF(buf);
118 
 
119 
  _asm {
120 
    push bx
121 
    push cx
122 
    push dx
123 
 
124 
    mov ah, 0x40
125 
    mov bx, handle
126 
    mov cx, count
127 
    mov dx, buf_off
128 
    push ds
129 
    mov ds, buf_seg
130 
 
131 
    int 0x21
132 
    pop ds
133 
    jnc done
134 
    mov res, ax
135 
 
136 
    done:
137 
    mov resax, ax
138 
 
139 
    pop dx
140 
    pop cx
141 
    pop bx
142 
  }
143 
 
144 
  *bytes = resax;
145 
  return(res);
146 
}