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 <errno.h>
18 #include <fcntl.h>
19 #include <string.h>
20 
21 #include "gmid.h"
22 
23 int
24 starts_with(const char *str, const char *prefix)
25 {
26 	size_t i;
27 
28 	if (prefix == NULL)
29 		return 0;
30 
31 	for (i = 0; prefix[i] != '\0'; ++i)
32 		if (str[i] != prefix[i])
33 			return 0;
34 	return 1;
35 }
36 
37 int
38 ends_with(const char *str, const char *sufx)
39 {
40 	size_t i, j;
41 
42 	i = strlen(str);
43 	j = strlen(sufx);
44 
45 	if (j > i)
46 		return 0;
47 
48 	i -= j;
49 	for (j = 0; str[i] != '\0'; i++, j++)
50 		if (str[i] != sufx[j])
51 			return 0;
52 	return 1;
53 }
54 
55 ssize_t
56 filesize(int fd)
57 {
58 	ssize_t len;
59 
60 	if ((len = lseek(fd, 0, SEEK_END)) == -1)
61 		return -1;
62 	if (lseek(fd, 0, SEEK_SET) == -1)
63 		return -1;
64 	return len;
65 }
66 
67 void
68 mark_nonblock(int fd)
69 {
70 	int flags;
71 
72 	if ((flags = fcntl(fd, F_GETFL)) == -1)
73 		fatal("fcntl(F_GETFL): %s", strerror(errno));
74 	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
75 		fatal("fcntl(F_SETFL): %s", strerror(errno));
76 }
77 
78 char *
79 absolutify_path(const char *path)
80 {
81 	char *wd, *r;
82 
83 	if (*path == '/') {
84 		if ((r = strdup(path)) == NULL)
85 			err(1, "strdup");
86 		return r;
87 	}
88 
89 	wd = getcwd(NULL, 0);
90 	if (asprintf(&r, "%s/%s", wd, path) == -1)
91 		err(1, "asprintf");
92 	free(wd);
93 	return r;
94 }