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glibc/iconv/iconvconfig.c
Roland McGrath ed2bca567c 2004-12-19 Roland McGrath <roland@redhat.com> 
* iconv/iconvconfig.c (nostdlib, output_file, output_file_len):
	New variables.
	(options, parse_opt, main): Take new options --nostdlib and
	--output/-o to set them.  Under --nostdlib, skip GCONV_PATH dirs.
	(write_output): If output_file is set, write the output there.
2004-12-19 23:23:42 +00:00

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/* Generate fastloading iconv module configuration files.
Copyright (C) 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2000.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <argp.h>
#include <assert.h>
#include <error.h>
#include <errno.h>
#include <fcntl.h>
#include <libintl.h>
#include <locale.h>
#include <mcheck.h>
#include <search.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/cdefs.h>
#include <sys/uio.h>
#include "iconvconfig.h"
/* Get libc version number. */
#include "../version.h"
#define PACKAGE _libc_intl_domainname
/* The hashing function we use. */
#include "../intl/hash-string.h"
/* Types used. */
struct module
{
char *fromname;
struct Strent *fromname_strent;
char *filename;
struct Strent *filename_strent;
const char *directory;
struct Strent *directory_strent;
struct module *next;
int cost;
struct Strent *toname_strent;
char toname[0];
};
struct alias
{
char *fromname;
struct Strent *froment;
struct module *module;
struct Strent *toent;
char toname[0];
};
struct name
{
const char *name;
struct Strent *strent;
int module_idx;
uint32_t hashval;
};
struct name_info
{
const char *canonical_name;
struct Strent *canonical_strent;
struct module *from_internal;
struct module *to_internal;
struct other_conv_list
{
int dest_idx;
struct other_conv
{
gidx_t module_idx;
struct module *module;
struct other_conv *next;
} other_conv;
struct other_conv_list *next;
} *other_conv_list;
};
/* Name and version of program. */
static void print_version (FILE *stream, struct argp_state *state);
void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;
/* Short description of program. */
static const char doc[] = N_("\
Create fastloading iconv module configuration file.");
/* Strings for arguments in help texts. */
static const char args_doc[] = N_("[DIR...]");
/* Prototype for option handler. */
static error_t parse_opt (int key, char *arg, struct argp_state *state);
/* Function to print some extra text in the help message. */
static char *more_help (int key, const char *text, void *input);
/* Definitions of arguments for argp functions. */
#define OPT_PREFIX 300
#define OPT_NOSTDLIB 301
static const struct argp_option options[] =
{
{ "prefix", OPT_PREFIX, "PATH", 0, N_("Prefix used for all file accesses") },
{ "output", 'o', "FILE", 0, N_("\
Put output in FILE instead of installed location\
(--prefix does not apply to FILE)") },
{ "nostdlib", OPT_NOSTDLIB, NULL, 0,
N_("Do not search standard directories, only those on the command line") },
{ NULL, 0, NULL, 0, NULL }
};
/* Data structure to communicate with argp functions. */
static struct argp argp =
{
options, parse_opt, args_doc, doc, NULL, more_help
};
/* The function doing the actual work. */
static int handle_dir (const char *dir);
/* Add all known builtin conversions and aliases. */
static void add_builtins (void);
/* Create list of all aliases without circular aliases. */
static void get_aliases (void);
/* Create list of all modules. */
static void get_modules (void);
/* Get list of all the names and thereby indexing them. */
static void generate_name_list (void);
/* Collect information about all the names. */
static void generate_name_info (void);
/* Write the output file. */
static int write_output (void);
/* Prefix to be used for all file accesses. */
static const char *prefix = "";
/* Its length. */
static size_t prefix_len;
/* Directory to place output file in. */
static const char *output_file;
/* Its length. */
static size_t output_file_len;
/* If true, omit the GCONV_PATH directories and require some arguments. */
static bool nostdlib;
/* Search tree of the modules we know. */
static void *modules;
/* Search tree of the aliases we know. */
static void *aliases;
/* Search tree for name to index mapping. */
static void *names;
/* Number of names we know about. */
static int nnames;
/* List of all aliases. */
static struct alias **alias_list;
static size_t nalias_list;
static size_t nalias_list_max;
/* List of all modules. */
static struct module **module_list;
static size_t nmodule_list;
static size_t nmodule_list_max;
/* Names and information about them. */
static struct name_info *name_info;
static size_t nname_info;
/* Number of translations not from or to INTERNAL. */
static size_t nextra_modules;
/* Names and aliases for the builtin transformations. */
static struct
{
const char *from;
const char *to;
} builtin_alias[] =
{
#define BUILTIN_ALIAS(alias, real) \
{ .from = alias, .to = real },
#define BUILTIN_TRANSFORMATION(From, To, Cost, Name, Fct, BtowcFct, \
MinF, MaxF, MinT, MaxT)
#include <gconv_builtin.h>
};
#undef BUILTIN_ALIAS
#undef BUILTIN_TRANSFORMATION
#define nbuiltin_alias (sizeof (builtin_alias) / sizeof (builtin_alias[0]))
static struct
{
const char *from;
const char *to;
const char *module;
int cost;
} builtin_trans[] =
{
#define BUILTIN_ALIAS(alias, real)
#define BUILTIN_TRANSFORMATION(From, To, Cost, Name, Fct, BtowcFct, \
MinF, MaxF, MinT, MaxT) \
{ .from = From, .to = To, .module = Name, .cost = Cost },
#include <gconv_builtin.h>
};
#undef BUILTIN_ALIAS
#undef BUILTIN_TRANSFORMATION
#define nbuiltin_trans (sizeof (builtin_trans) / sizeof (builtin_trans[0]))
/* Filename extension for the modules. */
#ifndef MODULE_EXT
# define MODULE_EXT ".so"
#endif
static const char gconv_module_ext[] = MODULE_EXT;
extern void *xmalloc (size_t n) __attribute_malloc__;
extern void *xcalloc (size_t n, size_t m) __attribute_malloc__;
extern void *xrealloc (void *p, size_t n);
/* C string table handling. */
struct Strtab;
struct Strent;
/* Create new C string table object in memory. */
extern struct Strtab *strtabinit (void);
/* Free resources allocated for C string table ST. */
extern void strtabfree (struct Strtab *st);
/* Add string STR (length LEN is != 0) to C string table ST. */
extern struct Strent *strtabadd (struct Strtab *st, const char *str,
size_t len);
/* Finalize string table ST and store size in *SIZE and return a pointer. */
extern void *strtabfinalize (struct Strtab *st, size_t *size);
/* Get offset in string table for string associated with SE. */
extern size_t strtaboffset (struct Strent *se);
/* String table we construct. */
static struct Strtab *strtab;
int
main (int argc, char *argv[])
{
int remaining;
int status = 0;
/* Enable memory use testing. */
/* mcheck_pedantic (NULL); */
mtrace ();
/* Set locale via LC_ALL. */
setlocale (LC_ALL, "");
/* Set the text message domain. */
textdomain (_libc_intl_domainname);
/* Parse and process arguments. */
argp_parse (&argp, argc, argv, 0, &remaining, NULL);
if (nostdlib && remaining == argc)
error (2, 0, _("Directory arguments required when using --nostdlib"));
/* Initialize the string table. */
strtab = strtabinit ();
/* Handle all directories mentioned. */
while (remaining < argc)
status |= handle_dir (argv[remaining++]);
if (! nostdlib)
{
/* In any case also handle the standard directory. */
char *path = strdupa (GCONV_PATH), *tp = strsep (&path, ":");
while (tp != NULL)
{
status |= handle_dir (tp);
tp = strsep (&path, ":");
}
}
/* Add the builtin transformations and aliases without overwriting
anything. */
add_builtins ();
/* Store aliases in an array. */
get_aliases ();
/* Get list of all modules. */
get_modules ();
/* Generate list of all the names we know to handle in some way. */
generate_name_list ();
/* Now we know all the names we will handle, collect information
about them. */
generate_name_info ();
/* Write the output file, but only if we haven't seen any error. */
if (status == 0)
status = write_output ();
else
error (1, 0, _("no output file produced because warning were issued"));
return status;
}
/* Handle program arguments. */
static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
switch (key)
{
case OPT_PREFIX:
prefix = arg;
prefix_len = strlen (prefix);
break;
case 'o':
output_file = arg;
output_file_len = strlen (output_file);
break;
case OPT_NOSTDLIB:
nostdlib = true;
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
static char *
more_help (int key, const char *text, void *input)
{
switch (key)
{
case ARGP_KEY_HELP_EXTRA:
/* We print some extra information. */
return strdup (gettext ("\
For bug reporting instructions, please see:\n\
<http://www.gnu.org/software/libc/bugs.html>.\n"));
default:
break;
}
return (char *) text;
}
/* Print the version information. */
static void
print_version (FILE *stream, struct argp_state *state)
{
fprintf (stream, "iconvconfig (GNU %s) %s\n", PACKAGE, VERSION);
fprintf (stream, gettext ("\
Copyright (C) %s Free Software Foundation, Inc.\n\
This is free software; see the source for copying conditions. There is NO\n\
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
"), "2004");
fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper");
}
static int
alias_compare (const void *p1, const void *p2)
{
const struct alias *a1 = (const struct alias *) p1;
const struct alias *a2 = (const struct alias *) p2;
return strcmp (a1->fromname, a2->fromname);
}
static void
new_alias (const char *fromname, size_t fromlen, const char *toname,
size_t tolen)
{
struct alias *newp;
void **inserted;
newp = (struct alias *) xmalloc (sizeof (struct alias) + fromlen + tolen);
newp->fromname = mempcpy (newp->toname, toname, tolen);
memcpy (newp->fromname, fromname, fromlen);
newp->module = NULL;
inserted = (void **) tsearch (newp, &aliases, alias_compare);
if (inserted == NULL)
error (EXIT_FAILURE, errno, gettext ("while inserting in search tree"));
if (*inserted != newp)
/* Something went wrong, free this entry. */
free (newp);
else
{
newp->froment = strtabadd (strtab, newp->fromname, fromlen);
newp->toent = strtabadd (strtab, newp->toname, tolen);
}
}
/* Add new alias. */
static void
add_alias (char *rp)
{
/* We now expect two more string. The strings are normalized
(converted to UPPER case) and strored in the alias database. */
char *from;
char *to;
char *wp;
while (isspace (*rp))
++rp;
from = wp = rp;
while (*rp != '\0' && !isspace (*rp))
*wp++ = toupper (*rp++);
if (*rp == '\0')
/* There is no `to' string on the line. Ignore it. */
return;
*wp++ = '\0';
to = ++rp;
while (isspace (*rp))
++rp;
while (*rp != '\0' && !isspace (*rp))
*wp++ = toupper (*rp++);
if (to == wp)
/* No `to' string, ignore the line. */
return;
*wp++ = '\0';
assert (strlen (from) + 1 == (size_t) (to - from));
assert (strlen (to) + 1 == (size_t) (wp - to));
new_alias (from, to - from, to, wp - to);
}
static void
append_alias (const void *nodep, VISIT value, int level)
{
if (value != leaf && value != postorder)
return;
if (nalias_list_max == nalias_list)
{
nalias_list_max += 50;
alias_list = (struct alias **) xrealloc (alias_list,
(nalias_list_max
* sizeof (struct alias *)));
}
alias_list[nalias_list++] = *(struct alias **) nodep;
}
static void
get_aliases (void)
{
twalk (aliases, append_alias);
}
static int
module_compare (const void *p1, const void *p2)
{
const struct module *m1 = (const struct module *) p1;
const struct module *m2 = (const struct module *) p2;
int result;
result = strcmp (m1->fromname, m2->fromname);
if (result == 0)
result = strcmp (m1->toname, m2->toname);
return result;
}
/* Create new module record. */
static void
new_module (const char *fromname, size_t fromlen, const char *toname,
size_t tolen, const char *directory,
const char *filename, size_t filelen, int cost, size_t need_ext)
{
struct module *new_module;
size_t dirlen = strlen (directory) + 1;
char *tmp;
void **inserted;
new_module = (struct module *) xmalloc (sizeof (struct module)
+ fromlen + tolen + filelen
+ need_ext);
new_module->fromname = mempcpy (new_module->toname, toname, tolen);
new_module->filename = mempcpy (new_module->fromname, fromname, fromlen);
new_module->cost = cost;
new_module->next = NULL;
tmp = mempcpy (new_module->filename, filename, filelen);
if (need_ext)
{
memcpy (tmp - 1, gconv_module_ext, need_ext + 1);
filelen += need_ext;
}
new_module->directory = directory;
/* Now insert the new module data structure in our search tree. */
inserted = (void **) tsearch (new_module, &modules, module_compare);
if (inserted == NULL)
error (EXIT_FAILURE, errno, "while inserting in search tree");
if (*inserted != new_module)
free (new_module);
else
{
new_module->fromname_strent = strtabadd (strtab, new_module->fromname,
fromlen);
new_module->toname_strent = strtabadd (strtab, new_module->toname,
tolen);
new_module->filename_strent = strtabadd (strtab, new_module->filename,
filelen);
new_module->directory_strent = strtabadd (strtab, directory, dirlen);
}
}
/* Add new module. */
static void
internal_function
add_module (char *rp, const char *directory)
{
/* We expect now
1. `from' name
2. `to' name
3. filename of the module
4. an optional cost value
*/
char *from;
char *to;
char *module;
char *wp;
int need_ext;
int cost;
while (isspace (*rp))
++rp;
from = rp;
while (*rp != '\0' && !isspace (*rp))
{
*rp = toupper (*rp);
++rp;
}
if (*rp == '\0')
return;
*rp++ = '\0';
to = wp = rp;
while (isspace (*rp))
++rp;
while (*rp != '\0' && !isspace (*rp))
*wp++ = toupper (*rp++);
if (*rp == '\0')
return;
*wp++ = '\0';
do
++rp;
while (isspace (*rp));
module = wp;
while (*rp != '\0' && !isspace (*rp))
*wp++ = *rp++;
if (*rp == '\0')
{
/* There is no cost, use one by default. */
*wp++ = '\0';
cost = 1;
}
else
{
/* There might be a cost value. */
char *endp;
*wp++ = '\0';
cost = strtol (rp, &endp, 10);
if (rp == endp || cost < 1)
/* No useful information. */
cost = 1;
}
if (module[0] == '\0')
/* No module name given. */
return;
/* See whether we must add the ending. */
need_ext = 0;
if ((size_t) (wp - module) < sizeof (gconv_module_ext)
|| memcmp (wp - sizeof (gconv_module_ext), gconv_module_ext,
sizeof (gconv_module_ext)) != 0)
/* We must add the module extension. */
need_ext = sizeof (gconv_module_ext) - 1;
assert (strlen (from) + 1 == (size_t) (to - from));
assert (strlen (to) + 1 == (size_t) (module - to));
assert (strlen (module) + 1 == (size_t) (wp - module));
new_module (from, to - from, to, module - to, directory, module, wp - module,
cost, need_ext);
}
/* Read the config file and add the data for this directory to that. */
static int
handle_dir (const char *dir)
{
char *cp;
FILE *fp;
char *line = NULL;
size_t linelen = 0;
size_t dirlen = strlen (dir);
if (dir[dirlen - 1] != '/')
{
char *newp = (char *) xmalloc (dirlen + 2);
dir = memcpy (newp, dir, dirlen);
newp[dirlen++] = '/';
newp[dirlen] = '\0';
}
char infile[prefix_len + dirlen + sizeof "gconv-modules"];
cp = infile;
if (dir[0] == '/')
cp = mempcpy (cp, prefix, prefix_len);
strcpy (mempcpy (cp, dir, dirlen), "gconv-modules");
fp = fopen (infile, "r");
if (fp == NULL)
{
error (0, errno, "cannot open `%s'", infile);
return 1;
}
/* No threads present. */
__fsetlocking (fp, FSETLOCKING_BYCALLER);
while (!feof_unlocked (fp))
{
char *rp, *endp, *word;
ssize_t n = __getdelim (&line, &linelen, '\n', fp);
if (n < 0)
/* An error occurred. */
break;
rp = line;
/* Terminate the line (excluding comments or newline) with a NUL
byte to simplify the following code. */
endp = strchr (rp, '#');
if (endp != NULL)
*endp = '\0';
else
if (rp[n - 1] == '\n')
rp[n - 1] = '\0';
while (isspace (*rp))
++rp;
/* If this is an empty line go on with the next one. */
if (rp == endp)
continue;
word = rp;
while (*rp != '\0' && !isspace (*rp))
++rp;
if (rp - word == sizeof ("alias") - 1
&& memcmp (word, "alias", sizeof ("alias") - 1) == 0)
add_alias (rp);
else if (rp - word == sizeof ("module") - 1
&& memcmp (word, "module", sizeof ("module") - 1) == 0)
add_module (rp, dir);
/* else */
/* Otherwise ignore the line. */
}
free (line);
fclose (fp);
return 0;
}
static void
append_module (const void *nodep, VISIT value, int level)
{
struct module *mo;
if (value != leaf && value != postorder)
return;
mo = *(struct module **) nodep;
if (nmodule_list > 0
&& strcmp (module_list[nmodule_list - 1]->fromname, mo->fromname) == 0)
{
/* Same name. */
mo->next = module_list[nmodule_list - 1];
module_list[nmodule_list - 1] = mo;
return;
}
if (nmodule_list_max == nmodule_list)
{
nmodule_list_max += 50;
module_list = (struct module **) xrealloc (module_list,
(nmodule_list_max
* sizeof (struct module *)));
}
module_list[nmodule_list++] = mo;
}
static void
get_modules (void)
{
twalk (modules, append_module);
}
static void
add_builtins (void)
{
size_t cnt;
/* Add all aliases. */
for (cnt = 0; cnt < nbuiltin_alias; ++cnt)
new_alias (builtin_alias[cnt].from,
strlen (builtin_alias[cnt].from) + 1,
builtin_alias[cnt].to,
strlen (builtin_alias[cnt].to) + 1);
/* add the builtin transformations. */
for (cnt = 0; cnt < nbuiltin_trans; ++cnt)
new_module (builtin_trans[cnt].from,
strlen (builtin_trans[cnt].from) + 1,
builtin_trans[cnt].to,
strlen (builtin_trans[cnt].to) + 1,
"", builtin_trans[cnt].module,
strlen (builtin_trans[cnt].module) + 1,
builtin_trans[cnt].cost, 0);
}
static int
name_compare (const void *p1, const void *p2)
{
const struct name *n1 = (const struct name *) p1;
const struct name *n2 = (const struct name *) p2;
return strcmp (n1->name, n2->name);
}
static struct name *
new_name (const char *str, struct Strent *strent)
{
struct name *newp = (struct name *) xmalloc (sizeof (struct name));
newp->name = str;
newp->strent = strent;
newp->module_idx = -1;
newp->hashval = __hash_string (str);
++nnames;
return newp;
}
static void
generate_name_list (void)
{
size_t i;
/* A name we always need. */
tsearch (new_name ("INTERNAL", strtabadd (strtab, "INTERNAL",
sizeof ("INTERNAL"))),
&names, name_compare);
for (i = 0; i < nmodule_list; ++i)
{
struct module *runp;
if (strcmp (module_list[i]->fromname, "INTERNAL") != 0)
tsearch (new_name (module_list[i]->fromname,
module_list[i]->fromname_strent),
&names, name_compare);
for (runp = module_list[i]; runp != NULL; runp = runp->next)
if (strcmp (runp->toname, "INTERNAL") != 0)
tsearch (new_name (runp->toname, runp->toname_strent),
&names, name_compare);
}
}
static int
name_to_module_idx (const char *name, int add)
{
struct name **res;
struct name fake_name = { .name = name };
int idx;
res = (struct name **) tfind (&fake_name, &names, name_compare);
if (res == NULL)
abort ();
idx = (*res)->module_idx;
if (idx == -1 && add)
/* No module index assigned yet. */
idx = (*res)->module_idx = nname_info++;
return idx;
}
static void
generate_name_info (void)
{
size_t i;
int idx;
name_info = (struct name_info *) xcalloc (nmodule_list + 1,
sizeof (struct name_info));
/* First add a special entry for the INTERNAL name. This must have
index zero. */
idx = name_to_module_idx ("INTERNAL", 1);
name_info[0].canonical_name = "INTERNAL";
name_info[0].canonical_strent = strtabadd (strtab, "INTERNAL",
sizeof ("INTERNAL"));
assert (nname_info == 1);
for (i = 0; i < nmodule_list; ++i)
{
struct module *runp;
for (runp = module_list[i]; runp != NULL; runp = runp->next)
if (strcmp (runp->fromname, "INTERNAL") == 0)
{
idx = name_to_module_idx (runp->toname, 1);
name_info[idx].from_internal = runp;
assert (name_info[idx].canonical_name == NULL
|| strcmp (name_info[idx].canonical_name,
runp->toname) == 0);
name_info[idx].canonical_name = runp->toname;
name_info[idx].canonical_strent = runp->toname_strent;
}
else if (strcmp (runp->toname, "INTERNAL") == 0)
{
idx = name_to_module_idx (runp->fromname, 1);
name_info[idx].to_internal = runp;
assert (name_info[idx].canonical_name == NULL
|| strcmp (name_info[idx].canonical_name,
runp->fromname) == 0);
name_info[idx].canonical_name = runp->fromname;
name_info[idx].canonical_strent = runp->fromname_strent;
}
else
{
/* This is a transformation not to or from the INTERNAL
encoding. */
int from_idx = name_to_module_idx (runp->fromname, 1);
int to_idx = name_to_module_idx (runp->toname, 1);
struct other_conv_list *newp;
newp = (struct other_conv_list *)
xmalloc (sizeof (struct other_conv_list));
newp->other_conv.module_idx = to_idx;
newp->other_conv.module = runp;
newp->other_conv.next = NULL; /* XXX Allow multiple module sequence */
newp->dest_idx = to_idx;
newp->next = name_info[from_idx].other_conv_list;
name_info[from_idx].other_conv_list = newp;
assert (name_info[from_idx].canonical_name == NULL
|| strcmp (name_info[from_idx].canonical_name,
runp->fromname) == 0);
name_info[from_idx].canonical_name = runp->fromname;
name_info[from_idx].canonical_strent = runp->fromname_strent;
++nextra_modules;
}
}
/* Now add the module index information for all the aliases. */
for (i = 0; i < nalias_list; ++i)
{
struct name fake_name = { .name = alias_list[i]->toname };
struct name **tonamep;
tonamep = (struct name **) tfind (&fake_name, &names, name_compare);
if (tonamep != NULL)
{
struct name *newp = new_name (alias_list[i]->fromname,
alias_list[i]->froment);
newp->module_idx = (*tonamep)->module_idx;
tsearch (newp, &names, name_compare);
}
}
}
static int
is_prime (unsigned long int candidate)
{
/* No even number and none less than 10 will be passed here. */
unsigned long int divn = 3;
unsigned long int sq = divn * divn;
while (sq < candidate && candidate % divn != 0)
{
++divn;
sq += 4 * divn;
++divn;
}
return candidate % divn != 0;
}
static uint32_t
next_prime (uint32_t seed)
{
/* Make it definitely odd. */
seed |= 1;
while (!is_prime (seed))
seed += 2;
return seed;
}
/* Format of the output file.
Offset Length Description
0000 4 Magic header bytes
0004 4 Offset of string table (stoff)
0008 4 Offset of name hashing table (hoff)
000C 4 Hashing table size (hsize)
0010 4 Offset of module table (moff)
0014 4 Offset of other conversion module table (ooff)
stoff ??? String table
hoff 8*hsize Array of tuples
string table offset
module index
moff ??? Array of tuples
canonical name offset
from-internal module dir name offset
from-internal module name off
to-internal module dir name offset
to-internal module name offset
offset into other conversion table
ooff ??? One or more of
number of steps/modules
one or more of tuple
canonical name offset for output
module dir name offset
module name offset
(following last entry with step count 0)
*/
static int
write_output (void)
{
int fd;
char *string_table;
size_t string_table_size;
struct gconvcache_header header;
struct hash_entry *hash_table;
size_t hash_size;
struct module_entry *module_table;
char *extra_table;
char *cur_extra_table;
size_t n;
int idx;
struct iovec iov[6];
static const gidx_t null_word;
size_t total;
char finalname[prefix_len + sizeof GCONV_MODULES_CACHE];
char tmpfname[(output_file == NULL ? sizeof finalname : output_file_len + 1)
+ strlen (".XXXXXX")];
/* Function to insert the names. */
auto void
name_insert (const void *nodep, VISIT value, int level)
{
struct name *name;
unsigned int idx;
unsigned int hval2;
if (value != leaf && value != postorder)
return;
name = *(struct name **) nodep;
idx = name->hashval % hash_size;
hval2 = 1 + name->hashval % (hash_size - 2);
while (hash_table[idx].string_offset != 0)
if ((idx += hval2) >= hash_size)
idx -= hash_size;
hash_table[idx].string_offset = strtaboffset (name->strent);
assert (name->module_idx != -1);
hash_table[idx].module_idx = name->module_idx;
}
/* Open the output file. */
if (output_file == NULL)
{
assert (GCONV_MODULES_CACHE[0] == '/');
strcpy (stpcpy (mempcpy (tmpfname, prefix, prefix_len),
GCONV_MODULES_CACHE),
".XXXXXX");
strcpy (mempcpy (finalname, prefix, prefix_len), GCONV_MODULES_CACHE);
}
else
strcpy (mempcpy (tmpfname, output_file, output_file_len), ".XXXXXX");
fd = mkstemp (tmpfname);
if (fd == -1)
return 1;
/* Create the string table. */
string_table = strtabfinalize (strtab, &string_table_size);
/* Create the hashing table. We know how many strings we have.
Creating a perfect hash table is not reasonable here. Therefore
we use open hashing and a table size which is the next prime 40%
larger than the number of strings. */
hash_size = next_prime (nnames * 1.4);
hash_table = (struct hash_entry *) xcalloc (hash_size,
sizeof (struct hash_entry));
/* Fill the hash table. */
twalk (names, name_insert);
/* Create the section for the module list. */
module_table = (struct module_entry *) xcalloc (sizeof (struct module_entry),
nname_info);
/* Allocate memory for the non-INTERNAL conversions. The allocated
memory can be more than is actually needed. */
extra_table = (char *) xcalloc (sizeof (struct extra_entry)
+ sizeof (gidx_t)
+ sizeof (struct extra_entry_module),
nextra_modules);
cur_extra_table = extra_table;
/* Fill in the module information. */
for (n = 0; n < nname_info; ++n)
{
module_table[n].canonname_offset =
strtaboffset (name_info[n].canonical_strent);
if (name_info[n].from_internal == NULL)
{
module_table[n].fromdir_offset = 0;
module_table[n].fromname_offset = 0;
}
else
{
module_table[n].fromdir_offset =
strtaboffset (name_info[n].from_internal->directory_strent);
module_table[n].fromname_offset =
strtaboffset (name_info[n].from_internal->filename_strent);
}
if (name_info[n].to_internal == NULL)
{
module_table[n].todir_offset = 0;
module_table[n].toname_offset = 0;
}
else
{
module_table[n].todir_offset =
strtaboffset (name_info[n].to_internal->directory_strent);
module_table[n].toname_offset =
strtaboffset (name_info[n].to_internal->filename_strent);
}
if (name_info[n].other_conv_list != NULL)
{
struct other_conv_list *other = name_info[n].other_conv_list;
/* Store the reference. We add 1 to distinguish the entry
at offset zero from the case where no extra modules are
available. The file reader has to account for the
offset. */
module_table[n].extra_offset = 1 + cur_extra_table - extra_table;
do
{
struct other_conv *runp;
struct extra_entry *extra;
/* Allocate new entry. */
extra = (struct extra_entry *) cur_extra_table;
cur_extra_table += sizeof (struct extra_entry);
extra->module_cnt = 0;
runp = &other->other_conv;
do
{
cur_extra_table += sizeof (struct extra_entry_module);
extra->module[extra->module_cnt].outname_offset =
runp->next == NULL
? other->dest_idx : runp->next->module_idx;
extra->module[extra->module_cnt].dir_offset =
strtaboffset (runp->module->directory_strent);
extra->module[extra->module_cnt].name_offset =
strtaboffset (runp->module->filename_strent);
++extra->module_cnt;
runp = runp->next;
}
while (runp != NULL);
other = other->next;
}
while (other != NULL);
/* Final module_cnt is zero. */
*((gidx_t *) cur_extra_table) = 0;
cur_extra_table += sizeof (gidx_t);
}
}
header.magic = GCONVCACHE_MAGIC;
iov[0].iov_base = &header;
iov[0].iov_len = sizeof (struct gconvcache_header);
total = iov[0].iov_len;
header.string_offset = total;
iov[1].iov_base = string_table;
iov[1].iov_len = string_table_size;
total += iov[1].iov_len;
idx = 2;
if ((string_table_size & (sizeof (gidx_t) - 1)) != 0)
{
iov[2].iov_base = (void *) &null_word;
iov[2].iov_len = (sizeof (gidx_t)
- (string_table_size & (sizeof (gidx_t) - 1)));
total += iov[2].iov_len;
++idx;
}
header.hash_offset = total;
header.hash_size = hash_size;
iov[idx].iov_base = hash_table;
iov[idx].iov_len = hash_size * sizeof (struct hash_entry);
total += iov[idx].iov_len;
++idx;
header.module_offset = total;
iov[idx].iov_base = module_table;
iov[idx].iov_len = nname_info * sizeof (struct module_entry);
total += iov[idx].iov_len;
++idx;
assert ((size_t) (cur_extra_table - extra_table)
<= ((sizeof (struct extra_entry) + sizeof (gidx_t)
+ sizeof (struct extra_entry_module))
* nextra_modules));
header.otherconv_offset = total;
iov[idx].iov_base = extra_table;
iov[idx].iov_len = cur_extra_table - extra_table;
total += iov[idx].iov_len;
++idx;
if ((size_t) TEMP_FAILURE_RETRY (writev (fd, iov, idx)) != total
/* The file was created with mode 0600. Make it world-readable. */
|| fchmod (fd, 0644) != 0
/* Rename the file, possibly replacing an old one. */
|| rename (tmpfname, output_file ?: finalname) != 0)
{
int save_errno = errno;
close (fd);
unlink (tmpfname);
error (EXIT_FAILURE, save_errno,
gettext ("cannot generate output file"));
}
close (fd);
return 0;
}
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