/*
* Error handling for libcdecl.
- * Copyright © 2011-2012, 2021 Nick Bowler
+ * Copyright © 2011-2012, 2021, 2023 Nick Bowler
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
-#include <string.h>
#include <assert.h>
-#include <stdarg.h>
#include "cdecl.h"
#include "cdecl-internal.h"
#include <glthread/lock.h>
#include <glthread/tls.h>
-gl_once_define(static, tls_initialized);
-static gl_tls_key_t tls_key;
+#include "errmsg.h"
struct err_state {
struct cdecl_error err;
char str[FLEXIBLE_ARRAY_MEMBER];
};
-/* This error is reserved for extremely dire out-of-memory conditions. */
-static struct err_state err_no_mem = {
- .err = {
- .code = CDECL_ENOMEM,
- .str = NULL,
- },
-};
+/* This pre-initialized error is reserved for dire out-of-memory conditions. */
+static struct cdecl_error err_no_mem;
+static gl_tls_key_t tls_key;
static void free_err(void *err)
{
free(err);
}
-static void initialize(void)
+static void set_err(unsigned code, struct cdecl_error *err)
{
- cdecl__init_i18n();
- err_no_mem.err.str = _("failed to allocate memory");
+ static const char errmsgs[] = STRTAB_INITIALIZER;
+
+ switch (code) {
+ case CDECL__ENOMEM:
+ err->code = CDECL_ENOMEM;
+ break;
+ default:
+ err->code = CDECL_ENOPARSE;
+ break;
+ }
+
+ err->str = _(&errmsgs[code]);
+}
+static void initialize_cb(void)
+{
+#if ENABLE_NLS
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ bindtextdomain("bison-runtime", BISON_LOCALEDIR);
+#endif
+ set_err(CDECL__ENOMEM, &err_no_mem);
gl_tls_key_init(tls_key, free_err);
}
-/*
- * cdecl__err(CDECL_ENOMEM);
- * cdecl__err(code, fmt, ...);
- *
- * Sets the library error to code, with a printf-style error string.
- */
-void cdecl__err(unsigned code, ...)
+static void *alloc_err_state(void *old, size_t buf_size)
{
- const char *fmt;
struct err_state *state;
- int rc, try = 0;
- va_list ap;
+ void *p;
+
+ state = p = realloc(old, offsetof(struct err_state, str) + buf_size);
+ if (state) {
+ state->nstr = buf_size;
+ } else if (old) {
+ /* Failed allocation, but existing state is still good */
+ p = old;
+ } else {
+ /* Failed allocation, no existing state */
+ p = &err_no_mem;
+ }
- gl_once(tls_initialized, initialize);
+ gl_tls_set(tls_key, p);
+ return state;
+}
+
+static struct err_state *get_err_state(void)
+{
+ void *state;
+
+ gl_once_define(static, tls_initialized)
+ gl_once(tls_initialized, initialize_cb);
state = gl_tls_get(tls_key);
- if (!state || state == &err_no_mem) {
- void *tmp = malloc(sizeof *state + 100);
+ if (state == &err_no_mem)
+ state = NULL;
+ if (!state)
+ return alloc_err_state(state, 100);
+ return state;
+}
- if (!tmp) {
- state = &err_no_mem;
- return;
- }
- gl_tls_set(tls_key, (state = tmp));
- state->nstr = 100;
- }
+#if ENABLE_NLS
+/*
+ * Initialize gettext indirectly via get_err_state.
+ */
+void cdecl__init_i18n(void)
+{
+ get_err_state();
+}
+#endif
- if (code == CDECL_ENOMEM) {
- if (state != &err_no_mem)
- state->err = err_no_mem.err;
+/*
+ * Set the library error to one of the preset messages defined in errmsg.h
+ * (CDECL__Exxx).
+ */
+void cdecl__errmsg(unsigned msg)
+{
+ struct err_state *state;
+
+ state = get_err_state();
+ if (!state)
return;
- }
-retry:
- va_start(ap, code);
- fmt = va_arg(ap, const char *);
- rc = vsnprintf(state->str, state->nstr, fmt, ap);
- va_end(ap);
- if (rc > 0 && rc >= state->nstr) {
- void *tmp;
- size_t n;
+ set_err(msg, &state->err);
+}
- assert(try == 0 && rc < SIZE_MAX / 4);
+/*
+ * Sets the library error to code; fmt is a printf-style string that may use
+ * up to one %s directive, to refer to arg.
+ */
+void cdecl__err(unsigned code, const char *fmt, const char *arg)
+{
+ struct err_state *state;
+ int rc, try = 0;
- n = ((size_t)rc + 1) * 2;
- tmp = realloc(state, sizeof *state + n);
- if (tmp) {
- state = tmp;
- state->nstr = n;
- try++;
+ state = get_err_state();
+ if (!state)
+ return;
- goto retry;
- }
+retry:
+ rc = snprintf(state->str, state->nstr, fmt, arg);
+ if (rc > 0 && rc >= state->nstr) {
+ assert(try++ == 0 && rc < SIZE_MAX / 4);
+ state = alloc_err_state(state, (size_t)(rc+1u) * 3 / 2);
+ if (!state)
+ return;
- state->err = err_no_mem.err;
- return;
+ goto retry;
}
state->err.str = state->str;
const struct cdecl_error *cdecl_get_error(void)
{
- struct err_state *state;
+ struct err_state *state = get_err_state();
- gl_once(tls_initialized, initialize);
-
- state = gl_tls_get(tls_key);
return state ? &state->err : NULL;
}