blob: 38252a736f97e6d26d048a14498a2df6f7747549 (
plain)
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
|
#include <u.h>
#include <libc.h>
#include <bio.h>
#include "libString.h"
/* Append an input line to a String.
*
* Returns a pointer to the character string (or 0).
* Leading whitespace and newlines are removed.
*
* Empty lines and lines starting with '#' are ignored.
*/
extern char *
s_getline(Biobuf *fp, String *to)
{
int c;
int len=0;
s_terminate(to);
/* end of input */
if ((c = Bgetc(fp)) < 0)
return 0;
/* take care of inconsequentials */
for(;;) {
/* eat leading white */
while(c==' ' || c=='\t' || c=='\n' || c=='\r')
c = Bgetc(fp);
if(c < 0)
return 0;
/* take care of comments */
if(c == '#'){
do {
c = Bgetc(fp);
if(c < 0)
return 0;
} while(c != '\n');
continue;
}
/* if we got here, we've gotten something useful */
break;
}
/* gather up a line */
for(;;) {
len++;
switch(c) {
case -1:
s_terminate(to);
return len ? to->ptr-len : 0;
case '\\':
c = Bgetc(fp);
if (c != '\n') {
s_putc(to, '\\');
s_putc(to, c);
}
break;
case '\n':
s_terminate(to);
return len ? to->ptr-len : 0;
default:
s_putc(to, c);
break;
}
c = Bgetc(fp);
}
}
|