1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "turng.h"
#ifndef __CMIX
# define __CMIX(X)
#endif
#define LINELEN 100
char* upcase(char* s) {
char* p = s;
while (*p) { *p = toupper(*p); p++; }
return s;
}
void readTuringProgram(char* filename) {
FILE* infile;
int lineno, maxlines, jump;
char* linenoStr;
char* command;
char* symbol;
char line[LINELEN];
if (!(infile = __CMIX(spectime)fopen(filename, "r"))) {
fprintf(stderr,
"Error: cannot find turing program source file `%s'\n",
filename);
exit(-1);
}
instrs = 0;
while (__CMIX(spectime)fgets(line, LINELEN, infile)) {
lineno = atoi(strtok(line, " \t\r\n"));
fprintf(stderr, "%2d ", lineno);
if (lineno >= MAXINSTRS) {
__CMIX(spectime)fprintf(stderr, "Linenumber %d too large\n", lineno);
__CMIX(spectime)exit(-1);
};
if (instrs <= lineno) instrs = lineno + 1;
command = upcase(strtok(NULL, " \t\r\n"));
if (!strcmp(command, "IF")) {
symbol = strtok(NULL, " \t\r\n'\"");
strtok(NULL, " '\"\t\r\n"); /* "goto" */
jump = atoi(strtok(NULL, " \t\r\n"));
instruction[lineno].tag = IfGoto;
instruction[lineno].a = symbol[0];
instruction[lineno].i = jump;
fprintf(stderr, "If '%c' goto %d\n",
instruction[lineno].a, instruction[lineno].i);
} else if (!strcmp(command, "LEFT")) {
instruction[lineno].tag = Left;
fprintf(stderr, "Left\n");
} else if (!strcmp(command, "RIGHT")) {
instruction[lineno].tag = Right;
fprintf(stderr, "Right\n");
} else if (!strcmp(command, "GOTO")) {
jump = atoi(strtok(NULL, " \t\r\n"));
instruction[lineno].tag = Goto;
instruction[lineno].i = jump;
fprintf(stderr, "Goto %d\n", instruction[lineno].i);
} else if (!strcmp(command, "READGOTO")) {
instruction[lineno].tag = ReadGoto;
fprintf(stderr, "ReadGoto\n", instruction[lineno].i);
} else if (!strcmp(command, "WRITE")) {
symbol = strtok(NULL, " \t\r\n'\"");
instruction[lineno].tag = Write;
instruction[lineno].a = symbol[0];
fprintf(stderr, "Write '%c'\n", instruction[lineno].a);
} else if (!strcmp(command, "STOP")) {
instruction[lineno].tag = Stop;
fprintf(stderr, "Stop\n");
}
}
fclose(infile);
}
|
