2 * Error handling for libcdecl.
3 * Copyright © 2011-2012, 2021, 2023 Nick Bowler
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
27 #include "cdecl-internal.h"
29 #include <glthread/lock.h>
30 #include <glthread/tls.h>
34 gl_once_define(static, tls_initialized)
35 static gl_tls_key_t tls_key;
38 struct cdecl_error err;
40 char str[FLEXIBLE_ARRAY_MEMBER];
43 /* This pre-initialized error is reserved for dire out-of-memory conditions. */
44 static struct cdecl_error err_no_mem;
46 static void free_err(void *err)
48 if (err == &err_no_mem)
54 static void set_err(unsigned code, struct cdecl_error *err)
56 static const char errmsgs[] = STRTAB_INITIALIZER;
60 err->code = CDECL_ENOMEM;
63 err->code = CDECL_ENOPARSE;
67 err->str = _(&errmsgs[code]);
70 static void initialize(void)
73 set_err(CDECL__ENOMEM, &err_no_mem);
74 gl_tls_key_init(tls_key, free_err);
77 static void *alloc_err_state(void *old, size_t buf_size)
79 struct err_state *state;
82 state = p = realloc(old, offsetof(struct err_state, str) + buf_size);
84 state->nstr = buf_size;
86 /* Failed allocation, but existing state is still good */
89 /* Failed allocation, no existing state */
93 gl_tls_set(tls_key, p);
97 static struct err_state *get_err_state(void)
101 gl_once(tls_initialized, initialize);
103 state = gl_tls_get(tls_key);
104 if (state == &err_no_mem)
107 return alloc_err_state(state, 100);
112 * Set the library error to one of the preset messages defined in errmsg.h
115 void cdecl__errmsg(unsigned msg)
117 struct err_state *state;
119 state = get_err_state();
123 set_err(msg, &state->err);
127 * Sets the library error to code, with a printf-style error string.
129 void cdecl__err(unsigned code, const char *fmt, ...)
131 struct err_state *state;
135 state = get_err_state();
141 rc = vsnprintf(state->str, state->nstr, fmt, ap);
144 if (rc > 0 && rc >= state->nstr) {
145 assert(try++ == 0 && rc < SIZE_MAX / 4);
146 state = alloc_err_state(state, (size_t)(rc+1u) * 3 / 2);
153 state->err.str = state->str;
154 state->err.code = code;
157 const struct cdecl_error *cdecl_get_error(void)
159 struct err_state *state = get_err_state();
161 return state ? &state->err : NULL;