1 /*
2 * SysDB - src/utils/error.c
3 * Copyright (C) 2013 Sebastian 'tokkee' Harl <sh@tokkee.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
28 #include "utils/error.h"
30 #include <pthread.h>
32 #include <stdarg.h>
33 #include <stdio.h>
34 #include <string.h>
36 /*
37 * private data types
38 */
40 typedef struct {
41 int prio;
42 char msg[SDB_MAX_ERROR];
43 _Bool finalized;
44 } sdb_error_ctx_t;
45 #define SDB_ERROR_INIT { -1, "", 1 }
47 /*
48 * private variables
49 */
51 static sdb_error_ctx_t default_error_ctx = SDB_ERROR_INIT;
53 static pthread_key_t error_ctx_key;
54 static _Bool error_ctx_key_initialized = 0;
56 /*
57 * private helper functions
58 */
60 static void
61 sdb_error_ctx_init(void)
62 {
63 if (error_ctx_key_initialized)
64 return;
66 pthread_key_create(&error_ctx_key, NULL);
67 error_ctx_key_initialized = 1;
68 } /* sdb_error_init */
70 static sdb_error_ctx_t *
71 sdb_error_ctx_create(void)
72 {
73 sdb_error_ctx_t *ctx;
75 ctx = malloc(sizeof(*ctx));
76 if (! ctx)
77 return NULL;
79 *ctx = default_error_ctx;
81 if (! error_ctx_key_initialized)
82 sdb_error_ctx_init();
83 pthread_setspecific(error_ctx_key, ctx);
84 return ctx;
85 } /* sdb_error_ctx_create */
87 static sdb_error_ctx_t *
88 sdb_error_get_ctx(void)
89 {
90 sdb_error_ctx_t *ctx;
92 if (! error_ctx_key_initialized)
93 sdb_error_ctx_init();
94 ctx = pthread_getspecific(error_ctx_key);
96 if (! ctx)
97 ctx = sdb_error_ctx_create();
98 if (! ctx)
99 return NULL;
100 return ctx;
101 } /* sdb_error_get_ctx */
103 static int
104 sdb_error_clear(void)
105 {
106 sdb_error_ctx_t *ctx;
108 ctx = sdb_error_get_ctx();
109 if (! ctx)
110 return -1;
112 ctx->prio = -1;
113 ctx->msg[0] = '\0';
114 ctx->finalized = 1;
115 return 0;
116 } /* sdb_error_clear */
118 static int
119 sdb_error_vappend(int prio, const char *fmt, va_list ap)
120 {
121 sdb_error_ctx_t *ctx;
122 size_t len;
124 ctx = sdb_error_get_ctx();
125 if (! ctx)
126 return -1;
128 len = strlen(ctx->msg);
129 if (len >= sizeof(ctx->msg))
130 return 0; /* nothing written */
132 if (prio >= 0)
133 ctx->prio = prio;
135 ctx->finalized = 0;
136 return vsnprintf(ctx->msg + len, sizeof(ctx->msg) - len, fmt, ap);
137 } /* sdb_error_vappend */
139 static int
140 sdb_error_log(void)
141 {
142 sdb_error_ctx_t *ctx;
143 int ret;
145 ctx = sdb_error_get_ctx();
146 if (! ctx)
147 return -1;
149 if (ctx->finalized)
150 return 0;
152 ret = fprintf(stderr, "[%s] %s\n",
153 SDB_LOG_PRIO_TO_STRING(ctx->prio), ctx->msg);
154 ctx->finalized = 1;
155 return ret;
156 } /* sdb_error_log */
158 /*
159 * public API
160 */
162 int
163 sdb_error_set(int prio, const char *fmt, ...)
164 {
165 va_list ap;
166 int ret;
168 if (sdb_error_clear())
169 return -1;
171 va_start(ap, fmt);
172 ret = sdb_error_vappend(prio, fmt, ap);
173 va_end(ap);
175 sdb_error_log();
176 return ret;
177 } /* sdb_error_set */
179 int
180 sdb_error_start(int prio, const char *fmt, ...)
181 {
182 va_list ap;
183 int ret;
185 if (sdb_error_clear())
186 return -1;
188 va_start(ap, fmt);
189 ret = sdb_error_vappend(prio, fmt, ap);
190 va_end(ap);
192 return ret;
193 } /* sdb_error_start */
195 int
196 sdb_error_append(const char *fmt, ...)
197 {
198 va_list ap;
199 int ret;
201 va_start(ap, fmt);
202 ret = sdb_error_vappend(/* dont change prio */ -1, fmt, ap);
203 va_end(ap);
205 return ret;
206 } /* sdb_error_append */
208 int
209 sdb_error_finish(void)
210 {
211 return sdb_error_log();
212 } /* sdb_error_finish */
214 const char *
215 sdb_error_get(void)
216 {
217 sdb_error_ctx_t *ctx;
219 ctx = sdb_error_get_ctx();
220 if (! ctx)
221 return "success";
222 return ctx->msg;
223 } /* sdb_error_get */
225 int
226 sdb_error_get_prio(void)
227 {
228 sdb_error_ctx_t *ctx;
230 ctx = sdb_error_get_ctx();
231 if (! ctx)
232 return -1;
233 return ctx->prio;
234 } /* sdb_error_get_prio */
236 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */