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 #include <uuid.h>
26 
27 #include "got_error.h"
28 #include "got_object.h"
29 
30 #include "got_lib_delta.h"
31 #include "got_lib_inflate.h"
32 #include "got_lib_object.h"
33 #include "got_lib_sha1.h"
34 
35 #ifndef nitems
36 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
37 #endif
38 
39 const struct got_error *
40 got_error(int code)
41 {
42 	int i;
43 
44 	for (i = 0; i < nitems(got_errors); i++) {
45 		if (code == got_errors[i].code)
46 			return &got_errors[i];
47 	}
48 
49 	abort();
50 }
51 
52 const struct got_error *
53 got_error_msg(int code, const char *msg)
54 {
55 	static struct got_error err;
56 	int i;
57 
58 	for (i = 0; i < nitems(got_errors); i++) {
59 		if (code == got_errors[i].code) {
60 			err.code = code;
61 			err.msg = msg;
62 			return &err;
63 		}
64 	}
65 
66 	abort();
67 }
68 
69 const struct got_error *
70 got_error_from_errno()
71 {
72 	static struct got_error err;
73 
74 	err.code = GOT_ERR_ERRNO;
75 	err.msg = strerror(errno);
76 	return &err;
77 }
78 
79 const struct got_error *
80 got_error_set_errno(int code)
81 {
82 	errno = code;
83 	return got_error_from_errno();
84 }
85 
86 const struct got_error *
87 got_ferror(FILE *f, int code)
88 {
89 	if (ferror(f))
90 		return got_error_from_errno();
91 	return got_error(code);
92 }
93 
94 const struct got_error *
95 got_error_no_obj(struct got_object_id *id)
96 {
97 	static char msg[sizeof("object   not found") +
98 	    SHA1_DIGEST_STRING_LENGTH];
99 	char id_str[SHA1_DIGEST_STRING_LENGTH];
100 	int ret;
101 
102 	if (!got_sha1_digest_to_str(id->sha1, id_str, sizeof(id_str)))
103 		return got_error(GOT_ERR_NO_OBJ);
104 
105 	ret = snprintf(msg, sizeof(msg), "object %s not found", id_str);
106 	if (ret == -1 || ret >= sizeof(msg))
107 		return got_error(GOT_ERR_NO_OBJ);
108 
109 	return got_error_msg(GOT_ERR_NO_OBJ, msg);
110 }
111 
112 const struct got_error *
113 got_error_not_ref(const char *refname)
114 {
115 	static char msg[sizeof("reference   not found") + 1004];
116 	int ret;
117 
118 	ret = snprintf(msg, sizeof(msg), "reference %s not found", refname);
119 	if (ret == -1 || ret >= sizeof(msg))
120 		return got_error(GOT_ERR_NOT_REF);
121 
122 	return got_error_msg(GOT_ERR_NOT_REF, msg);
123 }
124 
125 const struct got_error *
126 got_error_uuid(uint32_t uuid_status)
127 {
128 	switch (uuid_status) {
129 	case uuid_s_ok:
130 		return NULL;
131 	case uuid_s_bad_version:
132 		return got_error(GOT_ERR_UUID_VERSION);
133 	case uuid_s_invalid_string_uuid:
134 		return got_error(GOT_ERR_UUID_INVALID);
135 	case uuid_s_no_memory:
136 		return got_error_set_errno(ENOMEM);
137 	default:
138 		return got_error(GOT_ERR_UUID);
139 	}
140 }