source: buchla-68k/iolib/rawio.c@ 0170798

Last change on this file since 0170798 was b28a12e, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Zero redundant declarations.
  • Property mode set to 100644
File size: 4.9 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 "ram.h"
66
67int16_t readln(int16_t unit, int16_t nc, int8_t *ctl, int16_t nb, int8_t *buf)
68{
69 register int8_t *cp;
70 register int16_t i, j;
71 register int8_t *bp;
72 register int8_t c;
73
74
75 if (unit LT 1 OR unit GT 4) /* verify unit number is in range */
76 return(ERR15); /* return ERR15 if not */
77
78 bp = buf; /* setup buffer pointer */
79
80 for (i = 0; i < nb; i++) { /* main read loop */
81
82 c = BIOS(B_GETC, unit) & 0xFF; /* get a byte from the unit */
83
84 *bp++ = c; /* add it to the buffer */
85 *bp = '\0'; /* ... followed by a zero byte */
86
87 cp = ctl; /* setup to scan ctl for the character */
88
89 for (j = 0; j < nc; j++) /* scan each byte of ctl */
90 if (*ctl++ EQ c ) /* done if we find it */
91 return((int16_t)c);
92
93 BIOS(B_PUTC, unit, c); /* echo the character */
94 }
95
96 return(ERR01); /* buffer full */
97}
98
99/*
100 */
101
102int16_t getln(int16_t unit, int16_t nb, int8_t *buf)
103{
104 register int8_t *bp;
105 register int8_t c;
106 register int16_t bc;
107
108 bc = 0; /* number of characters currently in buffer */
109 bp = buf; /* current buffer pointer */
110 *bp = '\0'; /* initial null into buffer */
111
112 while (bc LT nb) {
113
114 c = BIOS(B_GETC, unit) & 0xFF;
115
116 switch (c) {
117
118 case A_BS:
119 case A_DEL:
120
121 if (bc EQ 0) {
122
123 BIOS(B_PUTC, unit, A_BEL);
124 break;
125
126 } else {
127
128 bc--;
129 bp--;
130 *bp = '\0';
131 BIOS(B_PUTC, unit, A_BS);
132 BIOS(B_PUTC, unit, ' ');
133 BIOS(B_PUTC, unit, A_BS);
134 break;
135 }
136
137 case A_CR:
138 case A_LF:
139
140 *bp++ = c; /* put character in buffer */
141 *bp = '\0'; /* terminate line with null */
142 return((int16_t)c); /* return -- CR or LF hit */
143
144/*
145 */
146
147 case CTL('X'):
148
149 *buf = '\0'; /* clear the buffer */
150 return((int16_t)c); /* return -- line cancelled */
151
152 default:
153
154 *bp++ = c; /* put character in buffer */
155 *bp = '\0'; /* terminate line with null */
156 BIOS(B_PUTC, unit, c); /* echo the character */
157 bc++; /* update character count */
158 }
159 }
160
161 return(ERR01); /* buffer full error */
162}
163
164/*
165 */
166
167int16_t getrln(int16_t unit, int16_t nb, int8_t *buf)
168{
169 register int8_t *bp;
170 register int8_t c;
171 register int16_t bc;
172
173 bc = 0; /* number of characters currently in buffer */
174 bp = buf; /* current buffer pointer */
175 *bp = '\0'; /* initial null into buffer */
176
177 while (bc LT nb) {
178
179 c = BIOS(B_GETC, unit) & 0xFF;
180
181 switch (c) {
182
183 case A_CR:
184 case A_LF:
185 case CTL('Z'):
186
187 *bp++ = c; /* put character in buffer */
188 *bp = '\0'; /* terminate line with null */
189 return((int16_t)c); /* return -- CR, LF, or ^Z hit */
190
191 case CTL('X'):
192
193 *buf = '\0'; /* clear the buffer */
194 return((int16_t)c); /* return -- line cancelled */
195
196 default:
197
198 *bp++ = c; /* put character in buffer */
199 *bp = '\0'; /* terminate line with null */
200 bc++; /* update character count */
201 }
202 }
203
204 return(ERR01); /* buffer full error */
205}
206
207/*
208 */
209
210void writeln(int16_t unit, int8_t *buf)
211{
212 register int8_t *bp;
213 register int8_t c;
214
215 bp = buf; /* setup buffer pointer */
216
217 while (c = *bp++) /* send the string, a byte at a time */
218 BIOS(B_PUTC, unit, c);
219}
220
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