source: buchla-68k/iolib/rawio.c@ 7258c6a

Last change on this file since 7258c6a was 7258c6a, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Use standard integer types.
  • Property mode set to 100644
File size: 5.0 KB
Line 
1/*
2 ============================================================================
3 rawio.c -- Some raw serial I/O routines for ROMP, et al
4 Version 5 -- 1987-06-11 -- D.N. Lynx Crowe
5
6 Defines: getln(), getrln(), readln(), writeln()
7
8 All of the following use raw BIOS calls to do their I/O.
9
10 int
11 getln(unit,nb,buf)
12 int unit; logical unit number 1..4
13 int nb; buffer limit
14 char *buf; buffer pointer
15
16 Reads a line from unit into buf, with a limit of nb
17 bytes. Does standard input editing (BS. DEL, ^X). Returns
18 on CR, LF, ^X, or buffer full. Returns the byte that stopped
19 the input, or ERR01 for buffer full. Echoes the characters as
20 it reads them, such that "What you see is what you get" on a crt.
21
22 int
23 getrln(unit, nb, buf)
24 int unit; logical unit number 1..4
25 int nb; buffer limit
26 char *buf; buffer pointer
27
28 Reads a line from unit into buf, with a limit of nb bytes.
29 Allows input to be cancelled by ^X. Returns on CR, LF, ^X,
30 ^Z, or buffer full. Returns the byte that stopped the input,
31 or ERR01 for buffer full.
32
33
34
35 int
36 readln(unit,nc,ctl,nb,buf)
37 int unit; logical unit number 1..4
38 int nc; length of control string ctl
39 char *ctl; control string pointer
40 int nb; buffer limit
41 char *buf; buffer pointer (at least nb+1 bytes)
42
43 Reads characters from unit into buf until: 1) nb bytes
44 have been transferred, or, 2) one of the characters in the string
45 at ctl has been read. The terminating character will be in the
46 buffer, followed by a null byte (even if the character from ctl
47 was a null byte). Returns: 1) the terminating character as its value,
48 or 2) ERR01 if stopped by the count in nb, or 3) ERR15 for an
49 invalid unit. Echoes characters as it reads them, unless the
50 character is one of those in ctl.
51
52 void
53 writeln(unit,buf)
54 int unit; logical unit number 0..4
55 char *buf; buffer pointer
56
57 Writes the zero terminated string from buf onto unit.
58
59 ============================================================================
60*/
61
62/*
63 */
64
65#include "stddefs.h"
66#include "errdefs.h"
67#include "ascii.h"
68#include "biosdefs.h"
69
70
71int16_t readln(int16_t unit, int16_t nc, int8_t *ctl, int16_t nb, int8_t *buf)
72{
73 register int8_t *cp;
74 register int16_t i, j;
75 register int8_t *bp;
76 register int8_t c;
77
78
79 if (unit LT 1 OR unit GT 4) /* verify unit number is in range */
80 return(ERR15); /* return ERR15 if not */
81
82 bp = buf; /* setup buffer pointer */
83
84 for (i = 0; i < nb; i++) { /* main read loop */
85
86 c = BIOS(B_GETC, unit) & 0xFF; /* get a byte from the unit */
87
88 *bp++ = c; /* add it to the buffer */
89 *bp = '\0'; /* ... followed by a zero byte */
90
91 cp = ctl; /* setup to scan ctl for the character */
92
93 for (j = 0; j < nc; j++) /* scan each byte of ctl */
94 if (*ctl++ EQ c ) /* done if we find it */
95 return((int16_t)c);
96
97 BIOS(B_PUTC, unit, c); /* echo the character */
98 }
99
100 return(ERR01); /* buffer full */
101}
102
103/*
104 */
105
106int16_t getln(int16_t unit, int16_t nb, int8_t *buf)
107{
108 register int8_t *bp;
109 register int8_t c;
110 register int16_t bc;
111
112 bc = 0; /* number of characters currently in buffer */
113 bp = buf; /* current buffer pointer */
114 *bp = '\0'; /* initial null into buffer */
115
116 while (bc LT nb) {
117
118 c = BIOS(B_GETC, unit) & 0xFF;
119
120 switch (c) {
121
122 case A_BS:
123 case A_DEL:
124
125 if (bc EQ 0) {
126
127 BIOS(B_PUTC, unit, A_BEL);
128 break;
129
130 } else {
131
132 bc--;
133 bp--;
134 *bp = '\0';
135 BIOS(B_PUTC, unit, A_BS);
136 BIOS(B_PUTC, unit, ' ');
137 BIOS(B_PUTC, unit, A_BS);
138 break;
139 }
140
141 case A_CR:
142 case A_LF:
143
144 *bp++ = c; /* put character in buffer */
145 *bp = '\0'; /* terminate line with null */
146 return((int16_t)c); /* return -- CR or LF hit */
147
148/*
149 */
150
151 case CTL('X'):
152
153 *buf = '\0'; /* clear the buffer */
154 return((int16_t)c); /* return -- line cancelled */
155
156 default:
157
158 *bp++ = c; /* put character in buffer */
159 *bp = '\0'; /* terminate line with null */
160 BIOS(B_PUTC, unit, c); /* echo the character */
161 bc++; /* update character count */
162 }
163 }
164
165 return(ERR01); /* buffer full error */
166}
167
168/*
169 */
170
171int16_t getrln(int16_t unit, int16_t nb, int8_t *buf)
172{
173 register int8_t *bp;
174 register int8_t c;
175 register int16_t bc;
176
177 bc = 0; /* number of characters currently in buffer */
178 bp = buf; /* current buffer pointer */
179 *bp = '\0'; /* initial null into buffer */
180
181 while (bc LT nb) {
182
183 c = BIOS(B_GETC, unit) & 0xFF;
184
185 switch (c) {
186
187 case A_CR:
188 case A_LF:
189 case CTL('Z'):
190
191 *bp++ = c; /* put character in buffer */
192 *bp = '\0'; /* terminate line with null */
193 return((int16_t)c); /* return -- CR, LF, or ^Z hit */
194
195 case CTL('X'):
196
197 *buf = '\0'; /* clear the buffer */
198 return((int16_t)c); /* return -- line cancelled */
199
200 default:
201
202 *bp++ = c; /* put character in buffer */
203 *bp = '\0'; /* terminate line with null */
204 bc++; /* update character count */
205 }
206 }
207
208 return(ERR01); /* buffer full error */
209}
210
211/*
212 */
213
214void writeln(int16_t unit, int8_t *buf)
215{
216 register int8_t *bp;
217 register int8_t c;
218
219 bp = buf; /* setup buffer pointer */
220
221 while (c = *bp++) /* send the string, a byte at a time */
222 BIOS(B_PUTC, unit, c);
223}
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