1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "telescope.h"
18 
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <stdlib.h>
22 #include <unistd.h>
23 
24 int
25 mark_nonblock(int fd)
26 {
27 	int flags;
28 
29 	if ((flags = fcntl(fd, F_GETFL)) == -1)
30                 return 0;
31 	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
32                 return 0;
33 	return 1;
34 }
35 
36 char *
37 telescope_strnchr(char *b, char d, size_t len)
38 {
39 	size_t i;
40 
41 	for (i = 0; i < len; ++i) {
42 		if (b[i] == d)
43 			return &b[i];
44 	}
45 
46 	return NULL;
47 }
48 
49 int
50 has_prefix(const char *str, const char *prfx)
51 {
52 	size_t i;
53 
54 	for (i = 0; str[i] != '\0' && prfx[i] != '\0'; ++i)
55 		if (str[i] != prfx[i])
56 			return 0;
57 	return prfx[i] == '\0';
58 }
59 
60 void
61 dispatch_imsg(struct imsgbuf *ibuf, imsg_handlerfn **handlers, size_t size)
62 {
63 	struct imsg	imsg;
64 	size_t		datalen, i;
65 	ssize_t		n;
66 
67 	if ((n = imsg_read(ibuf)) == -1) {
68 		if (errno == EAGAIN || errno == EWOULDBLOCK)
69 			return;
70                 _exit(1);
71 	}
72 
73 	if (n == 0)
74 		_exit(1);
75 
76 	for (;;) {
77 		if ((n = imsg_get(ibuf, &imsg)) == -1)
78 			_exit(1);
79 		if (n == 0)
80 			return;
81 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
82 		i = imsg.hdr.type;
83 		if (i >= (size / sizeof(imsg_handlerfn*)) || handlers[i] == NULL)
84 			abort();
85 		handlers[i](&imsg, datalen);
86 		imsg_free(&imsg);
87 	}
88 }