1 /* Copyright (C) 1991-2020 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU General Public 6 License as published by the Free Software Foundation; either 7 version 3 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 General Public License for more details. 13 14 You should have received a copy of the GNU General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #ifndef _LIBC 19 # include <libc-config.h> 20 #endif 21 22 /* Enable GNU extensions in fnmatch.h. */ 23 #ifndef _GNU_SOURCE 24 # define _GNU_SOURCE 1 25 #endif 26 27 #include <fnmatch.h> 28 29 #include <assert.h> 30 #include <errno.h> 31 #include <ctype.h> 32 #include <string.h> 33 #include <stdlib.h> 34 #if defined _LIBC || HAVE_ALLOCA 35 # include <alloca.h> 36 #endif 37 #include <wchar.h> 38 #include <wctype.h> 39 #include <stddef.h> 40 #include <stdbool.h> 41 42 /* We need some of the locale data (the collation sequence information) 43 but there is no interface to get this information in general. Therefore 44 we support a correct implementation only in glibc. */ 45 #ifdef _LIBC 46 # include "../locale/localeinfo.h" 47 # include "../locale/coll-lookup.h" 48 # include <shlib-compat.h> 49 50 # define CONCAT(a,b) __CONCAT(a,b) 51 # define btowc __btowc 52 # define iswctype __iswctype 53 # define mbsrtowcs __mbsrtowcs 54 # define mempcpy __mempcpy 55 # define strnlen __strnlen 56 # define towlower __towlower 57 # define wcscat __wcscat 58 # define wcslen __wcslen 59 # define wctype __wctype 60 # define wmemchr __wmemchr 61 # define wmempcpy __wmempcpy 62 # define fnmatch __fnmatch 63 extern int fnmatch (const char *pattern, const char *string, int flags); 64 #endif 65 66 #ifdef _LIBC 67 # if __GNUC__ < 7 68 # define FALLTHROUGH ((void) 0) 69 # else 70 # define FALLTHROUGH __attribute__ ((__fallthrough__)) 71 # endif 72 #else 73 # include "attribute.h" 74 #endif 75 76 #include <intprops.h> 77 #include <flexmember.h> 78 79 /* We often have to test for FNM_FILE_NAME and FNM_PERIOD being both set. */ 80 #define NO_LEADING_PERIOD(flags) \ 81 ((flags & (FNM_FILE_NAME | FNM_PERIOD)) == (FNM_FILE_NAME | FNM_PERIOD)) 82 83 #ifndef _LIBC 84 # if HAVE_ALLOCA 85 /* The OS usually guarantees only one guard page at the bottom of the stack, 86 and a page size can be as small as 4096 bytes. So we cannot safely 87 allocate anything larger than 4096 bytes. Also care for the possibility 88 of a few compiler-allocated temporary stack slots. */ 89 # define __libc_use_alloca(n) ((n) < 4032) 90 # else 91 /* Just use malloc. */ 92 # define __libc_use_alloca(n) false 93 # undef alloca 94 # define alloca(n) malloc (n) 95 # endif 96 # define alloca_account(size, avar) ((avar) += (size), alloca (size)) 97 #endif 98 99 /* Provide support for user-defined character classes, based on the functions 100 from ISO C 90 amendment 1. */ 101 #ifdef CHARCLASS_NAME_MAX 102 # define CHAR_CLASS_MAX_LENGTH CHARCLASS_NAME_MAX 103 #else 104 /* This shouldn't happen but some implementation might still have this 105 problem. Use a reasonable default value. */ 106 # define CHAR_CLASS_MAX_LENGTH 256 107 #endif 108 109 #define IS_CHAR_CLASS(string) wctype (string) 110 111 /* Avoid depending on library functions or files 112 whose names are inconsistent. */ 113 114 /* Global variable. */ 115 static int posixly_correct; 116 117 /* Note that this evaluates C many times. */ 118 #define FOLD(c) ((flags & FNM_CASEFOLD) ? tolower (c) : (c)) 119 #define CHAR char 120 #define UCHAR unsigned char 121 #define INT int 122 #define FCT internal_fnmatch 123 #define EXT ext_match 124 #define END end_pattern 125 #define STRUCT fnmatch_struct 126 #define L_(CS) CS 127 #define BTOWC(C) btowc (C) 128 #define STRLEN(S) strlen (S) 129 #define STRCAT(D, S) strcat (D, S) 130 #define MEMPCPY(D, S, N) mempcpy (D, S, N) 131 #define MEMCHR(S, C, N) memchr (S, C, N) 132 #define WIDE_CHAR_VERSION 0 133 #ifdef _LIBC 134 # include <locale/weight.h> 135 # define FINDIDX findidx 136 #endif 137 #include "fnmatch_loop.c" 138 139 140 #define FOLD(c) ((flags & FNM_CASEFOLD) ? towlower (c) : (c)) 141 #define CHAR wchar_t 142 #define UCHAR wint_t 143 #define INT wint_t 144 #define FCT internal_fnwmatch 145 #define EXT ext_wmatch 146 #define END end_wpattern 147 #define L_(CS) L##CS 148 #define BTOWC(C) (C) 149 #define STRLEN(S) wcslen (S) 150 #define STRCAT(D, S) wcscat (D, S) 151 #define MEMPCPY(D, S, N) wmempcpy (D, S, N) 152 #define MEMCHR(S, C, N) wmemchr (S, C, N) 153 #define WIDE_CHAR_VERSION 1 154 #ifdef _LIBC 155 /* Change the name the header defines so it doesn't conflict with 156 the <locale/weight.h> version included above. */ 157 # define findidx findidxwc 158 # include <locale/weightwc.h> 159 # undef findidx 160 # define FINDIDX findidxwc 161 #endif 162 163 #undef IS_CHAR_CLASS 164 /* We have to convert the wide character string in a multibyte string. But 165 we know that the character class names consist of alphanumeric characters 166 from the portable character set, and since the wide character encoding 167 for a member of the portable character set is the same code point as 168 its single-byte encoding, we can use a simplified method to convert the 169 string to a multibyte character string. */ 170 static wctype_t 171 is_char_class (const wchar_t *wcs) 172 { 173 char s[CHAR_CLASS_MAX_LENGTH + 1]; 174 char *cp = s; 175 176 do 177 { 178 /* Test for a printable character from the portable character set. */ 179 #ifdef _LIBC 180 if (*wcs < 0x20 || *wcs > 0x7e 181 || *wcs == 0x24 || *wcs == 0x40 || *wcs == 0x60) 182 return (wctype_t) 0; 183 #else 184 switch (*wcs) 185 { 186 case L' ': case L'!': case L'"': case L'#': case L'%': 187 case L'&': case L'\'': case L'(': case L')': case L'*': 188 case L'+': case L',': case L'-': case L'.': case L'/': 189 case L'0': case L'1': case L'2': case L'3': case L'4': 190 case L'5': case L'6': case L'7': case L'8': case L'9': 191 case L':': case L';': case L'<': case L'=': case L'>': 192 case L'?': 193 case L'A': case L'B': case L'C': case L'D': case L'E': 194 case L'F': case L'G': case L'H': case L'I': case L'J': 195 case L'K': case L'L': case L'M': case L'N': case L'O': 196 case L'P': case L'Q': case L'R': case L'S': case L'T': 197 case L'U': case L'V': case L'W': case L'X': case L'Y': 198 case L'Z': 199 case L'[': case L'\\': case L']': case L'^': case L'_': 200 case L'a': case L'b': case L'c': case L'd': case L'e': 201 case L'f': case L'g': case L'h': case L'i': case L'j': 202 case L'k': case L'l': case L'm': case L'n': case L'o': 203 case L'p': case L'q': case L'r': case L's': case L't': 204 case L'u': case L'v': case L'w': case L'x': case L'y': 205 case L'z': case L'{': case L'|': case L'}': case L'~': 206 break; 207 default: 208 return (wctype_t) 0; 209 } 210 #endif 211 212 /* Avoid overrunning the buffer. */ 213 if (cp == s + CHAR_CLASS_MAX_LENGTH) 214 return (wctype_t) 0; 215 216 *cp++ = (char) *wcs++; 217 } 218 while (*wcs != L'\0'); 219 220 *cp = '\0'; 221 222 return wctype (s); 223 } 224 #define IS_CHAR_CLASS(string) is_char_class (string) 225 226 #include "fnmatch_loop.c" 227 228 229 int 230 fnmatch (const char *pattern, const char *string, int flags) 231 { 232 if (__glibc_unlikely (MB_CUR_MAX != 1)) 233 { 234 mbstate_t ps; 235 size_t n; 236 const char *p; 237 wchar_t *wpattern_malloc = NULL; 238 wchar_t *wpattern; 239 wchar_t *wstring_malloc = NULL; 240 wchar_t *wstring; 241 size_t alloca_used = 0; 242 243 /* Convert the strings into wide characters. */ 244 memset (&ps, '\0', sizeof (ps)); 245 p = pattern; 246 n = strnlen (pattern, 1024); 247 if (__glibc_likely (n < 1024)) 248 { 249 wpattern = (wchar_t *) alloca_account ((n + 1) * sizeof (wchar_t), 250 alloca_used); 251 n = mbsrtowcs (wpattern, &p, n + 1, &ps); 252 if (__glibc_unlikely (n == (size_t) -1)) 253 /* Something wrong. 254 XXX Do we have to set 'errno' to something which mbsrtows hasn't 255 already done? */ 256 return -1; 257 if (p) 258 { 259 memset (&ps, '\0', sizeof (ps)); 260 goto prepare_wpattern; 261 } 262 } 263 else 264 { 265 prepare_wpattern: 266 n = mbsrtowcs (NULL, &pattern, 0, &ps); 267 if (__glibc_unlikely (n == (size_t) -1)) 268 /* Something wrong. 269 XXX Do we have to set 'errno' to something which mbsrtows hasn't 270 already done? */ 271 return -1; 272 if (__glibc_unlikely (n >= (size_t) -1 / sizeof (wchar_t))) 273 { 274 __set_errno (ENOMEM); 275 return -2; 276 } 277 wpattern_malloc = wpattern 278 = (wchar_t *) malloc ((n + 1) * sizeof (wchar_t)); 279 assert (mbsinit (&ps)); 280 if (wpattern == NULL) 281 return -2; 282 (void) mbsrtowcs (wpattern, &pattern, n + 1, &ps); 283 } 284 285 assert (mbsinit (&ps)); 286 n = strnlen (string, 1024); 287 p = string; 288 if (__glibc_likely (n < 1024)) 289 { 290 wstring = (wchar_t *) alloca_account ((n + 1) * sizeof (wchar_t), 291 alloca_used); 292 n = mbsrtowcs (wstring, &p, n + 1, &ps); 293 if (__glibc_unlikely (n == (size_t) -1)) 294 { 295 /* Something wrong. 296 XXX Do we have to set 'errno' to something which 297 mbsrtows hasn't already done? */ 298 free_return: 299 free (wpattern_malloc); 300 return -1; 301 } 302 if (p) 303 { 304 memset (&ps, '\0', sizeof (ps)); 305 goto prepare_wstring; 306 } 307 } 308 else 309 { 310 prepare_wstring: 311 n = mbsrtowcs (NULL, &string, 0, &ps); 312 if (__glibc_unlikely (n == (size_t) -1)) 313 /* Something wrong. 314 XXX Do we have to set 'errno' to something which mbsrtows hasn't 315 already done? */ 316 goto free_return; 317 if (__glibc_unlikely (n >= (size_t) -1 / sizeof (wchar_t))) 318 { 319 free (wpattern_malloc); 320 __set_errno (ENOMEM); 321 return -2; 322 } 323 324 wstring_malloc = wstring 325 = (wchar_t *) malloc ((n + 1) * sizeof (wchar_t)); 326 if (wstring == NULL) 327 { 328 free (wpattern_malloc); 329 return -2; 330 } 331 assert (mbsinit (&ps)); 332 (void) mbsrtowcs (wstring, &string, n + 1, &ps); 333 } 334 335 int res = internal_fnwmatch (wpattern, wstring, wstring + n, 336 flags & FNM_PERIOD, flags, NULL, 337 alloca_used); 338 339 free (wstring_malloc); 340 free (wpattern_malloc); 341 342 return res; 343 } 344 345 return internal_fnmatch (pattern, string, string + strlen (string), 346 flags & FNM_PERIOD, flags, NULL, 0); 347 } 348 349 #undef fnmatch 350 versioned_symbol (libc, __fnmatch, fnmatch, GLIBC_2_2_3); 351 #if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2_3) 352 strong_alias (__fnmatch, __fnmatch_old) 353 compat_symbol (libc, __fnmatch_old, fnmatch, GLIBC_2_0); 354 #endif 355 libc_hidden_ver (__fnmatch, fnmatch) 356