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glibc/stdio-common/reg-modifier.c
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/* Copyright (C) 2009-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
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, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <limits.h> | |
#include <printf.h> | |
#include <stdlib.h> | |
#include <wchar.h> | |
#include <libc-lock.h> | |
struct printf_modifier_record | |
{ | |
struct printf_modifier_record *next; | |
int bit; | |
wchar_t str[0]; | |
}; | |
struct printf_modifier_record **__printf_modifier_table attribute_hidden; | |
__libc_lock_define_initialized (static, lock) | |
/* Bits to hand out. */ | |
static int next_bit; | |
int | |
__register_printf_modifier (const wchar_t *str) | |
{ | |
if (str[0] == L'\0') | |
{ | |
einval: | |
__set_errno (EINVAL); | |
return -1; | |
} | |
const wchar_t *wc = str; | |
while (*wc != L'\0') | |
if (*wc < 0 || *wc > (wchar_t) UCHAR_MAX) | |
goto einval; | |
else | |
++wc; | |
if (next_bit / 8 == sizeof (((struct printf_info *) NULL)->user)) | |
{ | |
__set_errno (ENOSPC); | |
return -1; | |
} | |
int result = -1; | |
__libc_lock_lock (lock); | |
if (__printf_modifier_table == NULL) | |
{ | |
__printf_modifier_table = calloc (UCHAR_MAX, | |
sizeof (*__printf_modifier_table)); | |
if (__printf_modifier_table == NULL) | |
goto out; | |
} | |
/* Create enough room for the string. But we don't need the first | |
character. */ | |
struct printf_modifier_record *newp = malloc (sizeof (*newp) | |
+ ((wc - str) | |
* sizeof (wchar_t))); | |
if (newp == NULL) | |
goto out; | |
newp->next = __printf_modifier_table[(unsigned char) *str]; | |
newp->bit = 1 << next_bit++; | |
__wmemcpy (newp->str, str + 1, wc - str); | |
__printf_modifier_table[(unsigned char) *str] = newp; | |
result = newp->bit; | |
out: | |
__libc_lock_unlock (lock); | |
return result; | |
} | |
weak_alias (__register_printf_modifier, register_printf_modifier) | |
#include <stdio.h> | |
int | |
attribute_hidden | |
__handle_registered_modifier_mb (const unsigned char **format, | |
struct printf_info *info) | |
{ | |
struct printf_modifier_record *runp = __printf_modifier_table[**format]; | |
int best_bit = 0; | |
int best_len = 0; | |
const unsigned char *best_cp = NULL; | |
while (runp != NULL) | |
{ | |
const unsigned char *cp = *format + 1; | |
wchar_t *fcp = runp->str; | |
while (*cp != '\0' && *fcp != L'\0') | |
if (*cp != *fcp) | |
break; | |
else | |
++cp, ++fcp; | |
if (*fcp == L'\0' && cp - *format > best_len) | |
{ | |
best_cp = cp; | |
best_len = cp - *format; | |
best_bit = runp->bit; | |
} | |
runp = runp->next; | |
} | |
if (best_bit != 0) | |
{ | |
info->user |= best_bit; | |
*format = best_cp; | |
return 0; | |
} | |
return 1; | |
} | |
int | |
attribute_hidden | |
__handle_registered_modifier_wc (const unsigned int **format, | |
struct printf_info *info) | |
{ | |
struct printf_modifier_record *runp = __printf_modifier_table[**format]; | |
int best_bit = 0; | |
int best_len = 0; | |
const unsigned int *best_cp = NULL; | |
while (runp != NULL) | |
{ | |
const unsigned int *cp = *format + 1; | |
wchar_t *fcp = runp->str; | |
while (*cp != '\0' && *fcp != L'\0') | |
if (*cp != *fcp) | |
break; | |
else | |
++cp, ++fcp; | |
if (*fcp == L'\0' && cp - *format > best_len) | |
{ | |
best_cp = cp; | |
best_len = cp - *format; | |
best_bit = runp->bit; | |
} | |
runp = runp->next; | |
} | |
if (best_bit != 0) | |
{ | |
info->user |= best_bit; | |
*format = best_cp; | |
return 0; | |
} | |
return 1; | |
} | |
libc_freeres_fn (free_mem) | |
{ | |
if (__printf_modifier_table != NULL) | |
{ | |
for (int i = 0; i < UCHAR_MAX; ++i) | |
{ | |
struct printf_modifier_record *runp = __printf_modifier_table[i]; | |
while (runp != NULL) | |
{ | |
struct printf_modifier_record *oldp = runp; | |
runp = runp->next; | |
free (oldp); | |
} | |
} | |
free (__printf_modifier_table); | |
} | |
} |