lib/libc/citrus/citrus_prop.c

   1 /* $FreeBSD: head/lib/libc/iconv/citrus_prop.c 281798 2015-04-20 22:09:50Z pfg $ */
   2 /* $NetBSD: citrus_prop.c,v 1.4 2011/03/30 08:22:01 jruoho Exp $ */
   3
   4 /*-
   5  * Copyright (c)2006 Citrus Project,
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  */
  30
  31 #include <sys/cdefs.h>
  32
  33 #include <assert.h>
  34 #include <errno.h>
  35 #include <limits.h>
  36 #include <stdbool.h>
  37 #include <stddef.h>
  38 #include <stdio.h>
  39 #include <stdint.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42
  43 #include "citrus_namespace.h"
  44 #include "citrus_bcs.h"
  45 #include "citrus_region.h"
  46 #include "citrus_memstream.h"
  47 #include "citrus_prop.h"
  48
  49 typedef struct {
  50         _citrus_prop_type_t type;
  51         union {
  52                 const char *str;
  53                 int chr;
  54                 bool boolean;
  55                 uint64_t num;
  56         } u;
  57 } _citrus_prop_object_t;
  58
  59 static __inline void
  60 _citrus_prop_object_init(_citrus_prop_object_t *obj, _citrus_prop_type_t type)
  61 {
  62
  63         obj->type = type;
  64         memset(&obj->u, 0, sizeof(obj->u));
  65 }
  66
  67 static __inline void
  68 _citrus_prop_object_uninit(_citrus_prop_object_t *obj)
  69 {
  70
  71         if (obj->type == _CITRUS_PROP_STR)
  72                 free(__DECONST(void *, obj->u.str));
  73 }
  74
  75 static const char *xdigit = "0123456789ABCDEF";
  76
  77 #define _CITRUS_PROP_READ_UINT_COMMON(_func_, _type_, _max_)            \
  78 static int                                                              \
  79 _citrus_prop_read_##_func_##_common(struct _memstream * __restrict ms,  \
  80     _type_ * __restrict result, int base)                               \
  81 {                                                                       \
  82         _type_ acc, cutoff;                                             \
  83         int ch, cutlim, n;                                              \
  84         char *p;                                                        \
  85                                                                         \
  86         acc = (_type_)0;                                                \
  87         cutoff = _max_ / base;                                          \
  88         cutlim = _max_ % base;                                          \
  89         for (;;) {                                                      \
  90                 ch = _memstream_getc(ms);                               \
  91                 p = strchr(xdigit, _bcs_toupper(ch));                   \
  92                 if (p == NULL || (n = (p - xdigit)) >= base)            \
  93                         break;                                          \
  94                 if (acc > cutoff || (acc == cutoff && n > cutlim))      \
  95                         break;                                          \
  96                 acc *= base;                                            \
  97                 acc += n;                                               \
  98         }                                                               \
  99         _memstream_ungetc(ms, ch);                                      \
 100         *result = acc;                                                  \
 101         return (0);                                                     \
 102 }
 103 _CITRUS_PROP_READ_UINT_COMMON(chr, int, UCHAR_MAX)
 104 _CITRUS_PROP_READ_UINT_COMMON(num, uint64_t, UINT64_MAX)
 105 #undef _CITRUS_PROP_READ_UINT_COMMON
 106
 107 #define _CITRUS_PROP_READ_INT(_func_, _type_)                   \
 108 static int                                                      \
 109 _citrus_prop_read_##_func_(struct _memstream * __restrict ms,   \
 110     _citrus_prop_object_t * __restrict obj)                     \
 111 {                                                               \
 112         int base, ch;                                           \
 113                                                                 \
 114         _memstream_skip_ws(ms);                                 \
 115         ch = _memstream_getc(ms);                               \
 116         switch (ch) {                                           \
 117         case '+':                                               \
 118                 ch = _memstream_getc(ms);                       \
 119         }                                                       \
 120         base = 10;                                              \
 121         if (ch == '0') {                                        \
 122                 base -= 2;                                      \
 123                 ch = _memstream_getc(ms);                       \
 124                 if (ch == 'x' || ch == 'X') {                   \
 125                         ch = _memstream_getc(ms);               \
 126                         if (_bcs_isxdigit(ch) == 0) {           \
 127                                 _memstream_ungetc(ms, ch);      \
 128                                 obj->u._func_ = 0;              \
 129                                 return (0);                     \
 130                         }                                       \
 131                         base += 8;                              \
 132                 }                                               \
 133         } else if (_bcs_isdigit(ch) == 0)                       \
 134                 return (EINVAL);                                \
 135         _memstream_ungetc(ms, ch);                              \
 136         return (_citrus_prop_read_##_func_##_common             \
 137             (ms, &obj->u._func_, base));                        \
 138 }
 139 _CITRUS_PROP_READ_INT(chr, int)
 140 _CITRUS_PROP_READ_INT(num, uint64_t)
 141 #undef _CITRUS_PROP_READ_INT
 142
 143 static int
 144 _citrus_prop_read_character_common(struct _memstream * __restrict ms,
 145     int * __restrict result)
 146 {
 147         int base, ch;
 148
 149         ch = _memstream_getc(ms);
 150         if (ch != '\\')
 151                 *result = ch;
 152         else {
 153                 ch = _memstream_getc(ms);
 154                 base = 16;
 155                 switch (ch) {
 156                 case 'a':
 157                         *result = '\a';
 158                         break;
 159                 case 'b':
 160                         *result = '\b';
 161                         break;
 162                 case 'f':
 163                         *result = '\f';
 164                         break;
 165                 case 'n':
 166                         *result = '\n';
 167                         break;
 168                 case 'r':
 169                         *result = '\r';
 170                         break;
 171                 case 't':
 172                         *result = '\t';
 173                         break;
 174                 case 'v':
 175                         *result = '\v';
 176                         break;
 177                 case '0': case '1': case '2': case '3':
 178                 case '4': case '5': case '6': case '7':
 179                         _memstream_ungetc(ms, ch);
 180                         base -= 8;
 181                         /*FALLTHROUGH*/
 182                 case 'x':
 183                         return (_citrus_prop_read_chr_common(ms, result, base));
 184                         /*NOTREACHED*/
 185                 default:
 186                         /* unknown escape */
 187                         *result = ch;
 188                 }
 189         }
 190         return (0);
 191 }
 192
 193 static int
 194 _citrus_prop_read_character(struct _memstream * __restrict ms,
 195     _citrus_prop_object_t * __restrict obj)
 196 {
 197         int ch, errnum;
 198
 199         _memstream_skip_ws(ms);
 200         ch = _memstream_getc(ms);
 201         if (ch != '\'') {
 202                 _memstream_ungetc(ms, ch);
 203                 return (_citrus_prop_read_chr(ms, obj));
 204         }
 205         errnum = _citrus_prop_read_character_common(ms, &ch);
 206         if (errnum != 0)
 207                 return (errnum);
 208         obj->u.chr = ch;
 209         ch = _memstream_getc(ms);
 210         if (ch != '\'')
 211                 return (EINVAL);
 212         return (0);
 213 }
 214
 215 static int
 216 _citrus_prop_read_bool(struct _memstream * __restrict ms,
 217     _citrus_prop_object_t * __restrict obj)
 218 {
 219
 220         _memstream_skip_ws(ms);
 221         switch (_bcs_tolower(_memstream_getc(ms))) {
 222         case 't':
 223                 if (_bcs_tolower(_memstream_getc(ms)) == 'r' &&
 224                     _bcs_tolower(_memstream_getc(ms)) == 'u' &&
 225                     _bcs_tolower(_memstream_getc(ms)) == 'e') {
 226                         obj->u.boolean = true;
 227                         return (0);
 228                 }
 229                 break;
 230         case 'f':
 231                 if (_bcs_tolower(_memstream_getc(ms)) == 'a' &&
 232                     _bcs_tolower(_memstream_getc(ms)) == 'l' &&
 233                     _bcs_tolower(_memstream_getc(ms)) == 's' &&
 234                     _bcs_tolower(_memstream_getc(ms)) == 'e') {
 235                         obj->u.boolean = false;
 236                         return (0);
 237                 }
 238         }
 239         return (EINVAL);
 240 }
 241
 242 static int
 243 _citrus_prop_read_str(struct _memstream * __restrict ms,
 244     _citrus_prop_object_t * __restrict obj)
 245 {
 246         int ch, errnum, quot;
 247         char *s, *t;
 248 #define _CITRUS_PROP_STR_BUFSIZ 512
 249         size_t m, n;
 250
 251         m = _CITRUS_PROP_STR_BUFSIZ;
 252         s = malloc(m);
 253         if (s == NULL)
 254                 return (ENOMEM);
 255         n = 0;
 256         _memstream_skip_ws(ms);
 257         quot = _memstream_getc(ms);
 258         switch (quot) {
 259         case EOF:
 260                 goto done;
 261                 /*NOTREACHED*/
 262         case '\\':
 263                 _memstream_ungetc(ms, quot);
 264                 quot = EOF;
 265                 /*FALLTHROUGH*/
 266         case '\"': case '\'':
 267                 break;
 268         default:
 269                 s[n] = quot;
 270                 ++n, --m;
 271                 quot = EOF;
 272         }
 273         for (;;) {
 274                 if (m < 1) {
 275                         m = _CITRUS_PROP_STR_BUFSIZ;
 276                         t = realloc(s, n + m);
 277                         if (t == NULL) {
 278                                 free(s);
 279                                 return (ENOMEM);
 280                         }
 281                         s = t;
 282                 }
 283                 ch = _memstream_getc(ms);
 284                 if (quot == ch || (quot == EOF &&
 285                     (ch == ';' || _bcs_isspace(ch)))) {
 286 done:
 287                         s[n] = '\0';
 288                         obj->u.str = (const char *)s;
 289                         return (0);
 290                 }
 291                 _memstream_ungetc(ms, ch);
 292                 errnum = _citrus_prop_read_character_common(ms, &ch);
 293                 if (errnum != 0) {
 294                         free(s);
 295                         return (errnum);
 296                 }
 297                 s[n] = ch;
 298                 ++n, --m;
 299         }
 300         free(s);
 301         return (EINVAL);
 302 #undef _CITRUS_PROP_STR_BUFSIZ
 303 }
 304
 305 typedef int (*_citrus_prop_read_type_t)(struct _memstream * __restrict,
 306     _citrus_prop_object_t * __restrict);
 307
 308 static const _citrus_prop_read_type_t readers[] = {
 309         _citrus_prop_read_bool,
 310         _citrus_prop_read_str,
 311         _citrus_prop_read_character,
 312         _citrus_prop_read_num,
 313 };
 314
 315 static __inline int
 316 _citrus_prop_read_symbol(struct _memstream * __restrict ms,
 317     char * __restrict s, size_t n)
 318 {
 319         int ch;
 320         size_t m;
 321
 322         for (m = 0; m < n; ++m) {
 323                 ch = _memstream_getc(ms);
 324                 if (ch != '_' && _bcs_isalnum(ch) == 0)
 325                         goto name_found;
 326                 s[m] = ch;
 327         }
 328         ch = _memstream_getc(ms);
 329         if (ch == '_' || _bcs_isalnum(ch) != 0)
 330                 return (EINVAL);
 331
 332 name_found:
 333         _memstream_ungetc(ms, ch);
 334         s[m] = '\0';
 335
 336         return (0);
 337 }
 338
 339 static int
 340 _citrus_prop_parse_element(struct _memstream * __restrict ms,
 341     const _citrus_prop_hint_t * __restrict hints, void * __restrict context)
 342 {
 343         int ch, errnum;
 344 #define _CITRUS_PROP_HINT_NAME_LEN_MAX  255
 345         char name[_CITRUS_PROP_HINT_NAME_LEN_MAX + 1];
 346         const _citrus_prop_hint_t *hint;
 347         _citrus_prop_object_t ostart, oend;
 348
 349         errnum = _citrus_prop_read_symbol(ms, name, sizeof(name));
 350         if (errnum != 0)
 351                 return (errnum);
 352         for (hint = hints; hint->name != NULL; ++hint)
 353                 if (_citrus_bcs_strcasecmp(name, hint->name) == 0)
 354                         goto hint_found;
 355         return (EINVAL);
 356
 357 hint_found:
 358         _memstream_skip_ws(ms);
 359         ch = _memstream_getc(ms);
 360         if (ch != '=' && ch != ':')
 361                 _memstream_ungetc(ms, ch);
 362         do {
 363                 _citrus_prop_object_init(&ostart, hint->type);
 364                 _citrus_prop_object_init(&oend, hint->type);
 365                 errnum = (*readers[hint->type])(ms, &ostart);
 366                 if (errnum != 0)
 367                         return (errnum);
 368                 _memstream_skip_ws(ms);
 369                 ch = _memstream_getc(ms);
 370                 switch (hint->type) {
 371                 case _CITRUS_PROP_BOOL:
 372                         /*FALLTHROUGH*/
 373                 case _CITRUS_PROP_STR:
 374                         break;
 375                 default:
 376                         if (ch != '-')
 377                                 break;
 378                         errnum = (*readers[hint->type])(ms, &oend);
 379                         if (errnum != 0)
 380                                 return (errnum);
 381                         _memstream_skip_ws(ms);
 382                         ch = _memstream_getc(ms);
 383                 }
 384 #define CALL0(_func_)                                   \
 385 do {                                                    \
 386         errnum = (*hint->cb._func_.func)(context,       \
 387             hint->name, ostart.u._func_);               \
 388 } while (0)
 389 #define CALL1(_func_)                                   \
 390 do {                                                    \
 391         errnum = (*hint->cb._func_.func)(context,       \
 392             hint->name, ostart.u._func_, oend.u._func_);\
 393 } while (0)
 394                 switch (hint->type) {
 395                 case _CITRUS_PROP_BOOL:
 396                         CALL0(boolean);
 397                         break;
 398                 case _CITRUS_PROP_STR:
 399                         CALL0(str);
 400                         break;
 401                 case _CITRUS_PROP_CHR:
 402                         CALL1(chr);
 403                         break;
 404                 case _CITRUS_PROP_NUM:
 405                         CALL1(num);
 406                         break;
 407                 default:
 408                         abort();
 409                         /*NOTREACHED*/
 410                 }
 411 #undef CALL0
 412 #undef CALL1
 413                 _citrus_prop_object_uninit(&ostart);
 414                 _citrus_prop_object_uninit(&oend);
 415                 if (errnum != 0)
 416                         return (errnum);
 417         } while (ch == ',');
 418         if (ch != ';')
 419                 _memstream_ungetc(ms, ch);
 420         return (0);
 421 }
 422
 423 int
 424 _citrus_prop_parse_variable(const _citrus_prop_hint_t * __restrict hints,
 425     void * __restrict context, const void *var, size_t lenvar)
 426 {
 427         struct _memstream ms;
 428         int ch, errnum;
 429
 430         _memstream_bind_ptr(&ms, __DECONST(void *, var), lenvar);
 431         for (;;) {
 432                 _memstream_skip_ws(&ms);
 433                 ch = _memstream_getc(&ms);
 434                 if (ch == EOF || ch == '\0')
 435                         break;
 436                 _memstream_ungetc(&ms, ch);
 437                 errnum = _citrus_prop_parse_element(&ms, hints, context);
 438                 if (errnum != 0)
 439                         return (errnum);
 440         }
 441         return (0);
 442 }