1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
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 <sys/queue.h>
18 
19 #include <errno.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sha1.h>
24 #include <zlib.h>
25 
26 #include "got_error.h"
27 #include "got_object.h"
28 
29 #include "got_lib_delta.h"
30 #include "got_lib_inflate.h"
31 #include "got_lib_object.h"
32 #include "got_lib_sha1.h"
33 
34 #ifndef nitems
35 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
36 #endif
37 
38 const struct got_error *
39 got_error(int code)
40 {
41 	int i;
42 
43 	for (i = 0; i < nitems(got_errors); i++) {
44 		if (code == got_errors[i].code)
45 			return &got_errors[i];
46 	}
47 
48 	abort();
49 }
50 
51 const struct got_error *
52 got_error_msg(int code, const char *msg)
53 {
54 	static struct got_error err;
55 	int i;
56 
57 	for (i = 0; i < nitems(got_errors); i++) {
58 		if (code == got_errors[i].code) {
59 			err.code = code;
60 			err.msg = msg;
61 			return &err;
62 		}
63 	}
64 
65 	abort();
66 }
67 
68 const struct got_error *
69 got_error_from_errno()
70 {
71 	static struct got_error err;
72 
73 	err.code = GOT_ERR_ERRNO;
74 	err.msg = strerror(errno);
75 	return &err;
76 }
77 
78 const struct got_error *
79 got_error_set_errno(int code)
80 {
81 	errno = code;
82 	return got_error_from_errno();
83 }
84 
85 const struct got_error *
86 got_ferror(FILE *f, int code)
87 {
88 	if (ferror(f))
89 		return got_error_from_errno();
90 	return got_error(code);
91 }
92 
93 const struct got_error *
94 got_error_no_obj(struct got_object_id *id)
95 {
96 	static char msg[sizeof("object   not found") +
97 	    SHA1_DIGEST_STRING_LENGTH];
98 	char id_str[SHA1_DIGEST_STRING_LENGTH];
99 	int ret;
100 
101 	if (!got_sha1_digest_to_str(id->sha1, id_str, sizeof(id_str)))
102 		return got_error(GOT_ERR_NO_OBJ);
103 
104 	ret = snprintf(msg, sizeof(msg), "object %s not found", id_str);
105 	if (ret == -1 || ret >= sizeof(msg))
106 		return got_error(GOT_ERR_NO_OBJ);
107 
108 	return got_error_msg(GOT_ERR_NO_OBJ, msg);
109 }