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
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
#include <stdio.h>
#include <ctype.h>
#define DEFTAB 8
#define MAXSTOPS 65
#define ON 1
int stops[MAXSTOPS];
int stop_position, detab_bool, entab_bool;
void entab(void);
void detab(void);
int
main(int argc, char **argv)
{
int flag;
while (--argc > 0 && **++argv == '-')
while((flag = *++*argv))
switch (flag) {
case 'e' :
entab_bool = ON;
break;
case 'd' :
detab_bool = ON;
break;
case 's' :
if(*++*argv != '=')
argc = -1;
else
(*argv)++;
if (**argv == '\0')
argc = -1;
while (isdigit(**argv)) {
if (stop_position > MAXSTOPS)
argc = -1;
stops[stop_position] = stops[stop_position] * 10 + (**argv) - '0';
(*argv)++;
if (**argv == ',') {
(*argv)++;
if(isdigit(**argv) && stop_position < MAXSTOPS)
stop_position++;
}
}
stop_position++;
(*argv)--;
break;
default :
argc = -1;
printf("Err: illigal option %c\n", flag);
break;
}
if (argc || !entab_bool ^ detab_bool)
printf("Usage: tab (-e || -d) -s=s1,s2,s3,...,s%d\n", MAXSTOPS-1);
else if(entab_bool)
entab();
else if (detab_bool)
detab();
return 0;
}
void
entab(void)
{
char input;
int space, stop_now;
space = 0;
stop_now = 0;
stops[stop_position] = DEFTAB;
while((input = getchar()) != EOF)
switch(input) {
case ' ' :
space++;
break;
default :
while (space/stops[stop_now]) {
space -= stops[stop_now];
putchar('\t');
if (stop_now < stop_position)
stop_now++;
}
while (space) {
putchar(' ');
space--;
}
putchar(input);
break;
}
}
void
detab(void)
{
char input;
int count, space, stop_now;
count = 0;
stop_now = 0;
stops[stop_position] = DEFTAB;
while ((input = getchar()) != EOF)
switch (input) {
case '\n' :
count = 0;
putchar('\n');
break;
case '\t' :
space = stops[stop_now] - count%stops[stop_now];
count += space;
while (space--)
putchar(' ');
if (stop_now < stop_position)
stop_now++;
break;
default :
count++;
putchar(input);
break;
}
}
|
