-
Notifications
You must be signed in to change notification settings - Fork 0
/
parseline.c
102 lines (93 loc) · 2.09 KB
/
parseline.c
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
/*
* ISC License
*
* Copyright (c) 2021, Tommi Leino <namhas@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <syslog.h>
#include <ctype.h>
size_t
parseline(char *base, char *dst, size_t dstsz)
{
char *s, *t, *separator;
size_t len;
/*
* Do we have a separator? If not, return NULL.
*/
s = base;
while (*s != '\0' && *s != '\n')
s++;
if (*s == '\0') {
return -1;
} else {
}
separator = s;
/*
* We had a separator. Extract the line.
*/
s = base;
len = 0;
while (s != separator && ++len < dstsz - 1) {
if (iscntrl(*s) || !isascii(*s)) {
len--;
s++;
} else
*dst++ = *s++;
}
*dst = '\0';
/*
* Overwrite old base with the remaining content, if any.
*/
s = base;
t = separator + 1;
while (*t != '\0')
*s++ = *t++;
*s = '\0';
return separator - base + 1;
}
#ifdef TEST
#include <ctype.h>
#include <unistd.h>
#include <err.h>
int main(int argc, char *argv[])
{
int n;
int len;
int sz;
char buf[1024], dst[1024];
sz = 0;
for (;;) {
if (sizeof(buf) - 1 - sz <= 0) {
warnx("discarded %d bytes; too long line", sz);
sz = 0;
}
n = read(0, &buf[sz], sizeof(buf) - 1 - sz);
if (n > 0) {
sz += n;
buf[sz] = '\0';
while ((len = parseline(buf, dst, sizeof(dst)))
!= -1) {
puts(dst);
sz -= len;
}
} else if (n < 0)
err(1, "read");
else if (n == 0)
break;
}
}
#endif