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 #include <sys/param.h>
27 
28 #include "got_error.h"
29 #include "got_object.h"
30 
31 #include "got_lib_delta.h"
32 #include "got_lib_inflate.h"
33 #include "got_lib_object.h"
34 #include "got_lib_sha1.h"
35 
36 #ifndef nitems
37 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
38 #endif
39 
40 const struct got_error *
41 got_error(int code)
42 {
43 	int i;
44 
45 	for (i = 0; i < nitems(got_errors); i++) {
46 		if (code == got_errors[i].code)
47 			return &got_errors[i];
48 	}
49 
50 	abort();
51 }
52 
53 const struct got_error *
54 got_error_msg(int code, const char *msg)
55 {
56 	static struct got_error err;
57 	int i;
58 
59 	for (i = 0; i < nitems(got_errors); i++) {
60 		if (code == got_errors[i].code) {
61 			err.code = code;
62 			err.msg = msg;
63 			return &err;
64 		}
65 	}
66 
67 	abort();
68 }
69 
70 const struct got_error *
71 got_error_from_errno(void)
72 {
73 	static struct got_error err;
74 
75 	err.code = GOT_ERR_ERRNO;
76 	err.msg = strerror(errno);
77 	return &err;
78 }
79 
80 const struct got_error *
81 got_error_prefix_errno(const char *prefix)
82 {
83 	static struct got_error err;
84 	static char err_msg[MAXPATHLEN + 20];
85 
86 	snprintf(err_msg, sizeof(err_msg), "%s: %s", prefix,
87 	    strerror(errno));
88 
89 	err.code = GOT_ERR_ERRNO;
90 	err.msg = err_msg;
91 	return &err;
92 }
93 
94 const struct got_error *
95 got_error_set_errno(int code)
96 {
97 	errno = code;
98 	return got_error_from_errno();
99 }
100 
101 const struct got_error *
102 got_ferror(FILE *f, int code)
103 {
104 	if (ferror(f))
105 		return got_error_from_errno();
106 	return got_error(code);
107 }
108 
109 const struct got_error *
110 got_error_no_obj(struct got_object_id *id)
111 {
112 	static char msg[sizeof("object   not found") +
113 	    SHA1_DIGEST_STRING_LENGTH];
114 	char id_str[SHA1_DIGEST_STRING_LENGTH];
115 	int ret;
116 
117 	if (!got_sha1_digest_to_str(id->sha1, id_str, sizeof(id_str)))
118 		return got_error(GOT_ERR_NO_OBJ);
119 
120 	ret = snprintf(msg, sizeof(msg), "object %s not found", id_str);
121 	if (ret == -1 || ret >= sizeof(msg))
122 		return got_error(GOT_ERR_NO_OBJ);
123 
124 	return got_error_msg(GOT_ERR_NO_OBJ, msg);
125 }
126 
127 const struct got_error *
128 got_error_not_ref(const char *refname)
129 {
130 	static char msg[sizeof("reference   not found") + 1004];
131 	int ret;
132 
133 	ret = snprintf(msg, sizeof(msg), "reference %s not found", refname);
134 	if (ret == -1 || ret >= sizeof(msg))
135 		return got_error(GOT_ERR_NOT_REF);
136 
137 	return got_error_msg(GOT_ERR_NOT_REF, msg);
138 }
139 
140 const struct got_error *
141 got_error_uuid(uint32_t uuid_status)
142 {
143 	switch (uuid_status) {
144 	case uuid_s_ok:
145 		return NULL;
146 	case uuid_s_bad_version:
147 		return got_error(GOT_ERR_UUID_VERSION);
148 	case uuid_s_invalid_string_uuid:
149 		return got_error(GOT_ERR_UUID_INVALID);
150 	case uuid_s_no_memory:
151 		return got_error_set_errno(ENOMEM);
152 	default:
153 		return got_error(GOT_ERR_UUID);
154 	}
155 }