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Annotation of mandoc/chars.c, Revision 1.58

1.58    ! schwarze    1: /*     $Id: chars.c,v 1.57 2014/04/20 16:46:04 schwarze Exp $ */
1.1       kristaps    2: /*
1.51      schwarze    3:  * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
1.32      schwarze    4:  * Copyright (c) 2011 Ingo Schwarze <schwarze@openbsd.org>
1.1       kristaps    5:  *
                      6:  * Permission to use, copy, modify, and distribute this software for any
                      7:  * purpose with or without fee is hereby granted, provided that the above
                      8:  * copyright notice and this permission notice appear in all copies.
                      9:  *
                     10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     14:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     15:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     16:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     17:  */
1.14      kristaps   18: #ifdef HAVE_CONFIG_H
                     19: #include "config.h"
                     20: #endif
                     21:
1.1       kristaps   22: #include <assert.h>
1.40      kristaps   23: #include <ctype.h>
1.1       kristaps   24: #include <stdlib.h>
                     25: #include <string.h>
                     26:
1.18      kristaps   27: #include "mandoc.h"
1.56      schwarze   28: #include "mandoc_aux.h"
1.43      kristaps   29: #include "libmandoc.h"
1.1       kristaps   30:
1.2       kristaps   31: #define        PRINT_HI         126
                     32: #define        PRINT_LO         32
1.1       kristaps   33:
                     34: struct ln {
                     35:        struct ln        *next;
                     36:        const char       *code;
1.2       kristaps   37:        const char       *ascii;
1.21      kristaps   38:        int               unicode;
1.1       kristaps   39: };
                     40:
1.55      schwarze   41: #define        LINES_MAX         330
1.1       kristaps   42:
1.24      kristaps   43: #define CHAR(in, ch, code) \
1.45      kristaps   44:        { NULL, (in), (ch), (code) },
1.1       kristaps   45:
1.13      kristaps   46: #define        CHAR_TBL_START    static struct ln lines[LINES_MAX] = {
                     47: #define        CHAR_TBL_END      };
                     48:
1.1       kristaps   49: #include "chars.in"
                     50:
1.36      kristaps   51: struct mchars {
1.1       kristaps   52:        struct ln       **htab;
                     53: };
                     54:
1.57      schwarze   55: static const struct ln  *find(const struct mchars *,
1.52      kristaps   56:                                const char *, size_t);
1.1       kristaps   57:
1.57      schwarze   58:
1.1       kristaps   59: void
1.36      kristaps   60: mchars_free(struct mchars *arg)
1.1       kristaps   61: {
                     62:
1.36      kristaps   63:        free(arg->htab);
                     64:        free(arg);
1.1       kristaps   65: }
                     66:
1.36      kristaps   67: struct mchars *
1.38      kristaps   68: mchars_alloc(void)
1.1       kristaps   69: {
1.36      kristaps   70:        struct mchars    *tab;
1.1       kristaps   71:        struct ln       **htab;
                     72:        struct ln        *pp;
                     73:        int               i, hash;
                     74:
                     75:        /*
                     76:         * Constructs a very basic chaining hashtable.  The hash routine
                     77:         * is simply the integral value of the first character.
1.47      kristaps   78:         * Subsequent entries are chained in the order they're processed.
1.1       kristaps   79:         */
                     80:
1.36      kristaps   81:        tab = mandoc_malloc(sizeof(struct mchars));
1.53      schwarze   82:        htab = mandoc_calloc(PRINT_HI - PRINT_LO + 1, sizeof(struct ln *));
1.1       kristaps   83:
                     84:        for (i = 0; i < LINES_MAX; i++) {
1.2       kristaps   85:                hash = (int)lines[i].code[0] - PRINT_LO;
1.1       kristaps   86:
                     87:                if (NULL == (pp = htab[hash])) {
                     88:                        htab[hash] = &lines[i];
                     89:                        continue;
                     90:                }
                     91:
                     92:                for ( ; pp->next; pp = pp->next)
                     93:                        /* Scan ahead. */ ;
                     94:                pp->next = &lines[i];
                     95:        }
                     96:
                     97:        tab->htab = htab;
                     98:        return(tab);
                     99: }
                    100:
1.21      kristaps  101: int
1.52      kristaps  102: mchars_spec2cp(const struct mchars *arg, const char *p, size_t sz)
1.21      kristaps  103: {
                    104:        const struct ln *ln;
                    105:
1.45      kristaps  106:        ln = find(arg, p, sz);
1.21      kristaps  107:        if (NULL == ln)
                    108:                return(-1);
                    109:        return(ln->unicode);
                    110: }
                    111:
1.39      kristaps  112: char
1.36      kristaps  113: mchars_num2char(const char *p, size_t sz)
1.32      schwarze  114: {
1.57      schwarze  115:        int       i;
1.32      schwarze  116:
1.48      kristaps  117:        if ((i = mandoc_strntoi(p, sz, 10)) < 0)
1.39      kristaps  118:                return('\0');
1.57      schwarze  119:
                    120:        return(i > 0 && i < 256 && isprint(i) ? i : '\0');
1.44      kristaps  121: }
                    122:
                    123: int
                    124: mchars_num2uc(const char *p, size_t sz)
                    125: {
1.57      schwarze  126:        int      i;
1.39      kristaps  127:
1.48      kristaps  128:        if ((i = mandoc_strntoi(p, sz, 16)) < 0)
1.44      kristaps  129:                return('\0');
1.58    ! schwarze  130:
        !           131:        /*
        !           132:         * Security warning:
        !           133:         * Never extend the range of accepted characters
        !           134:         * to overlap with the ASCII range, 0x00-0x7F
        !           135:         * without re-auditing the callers of this function.
        !           136:         * Some callers might relay on the fact that we never
        !           137:         * return ASCII characters for their escaping decisions.
        !           138:         *
        !           139:         * XXX Code is missing here to exclude bogus ranges.
        !           140:         */
        !           141:
1.44      kristaps  142:        return(i > 0x80 && i <= 0x10FFFF ? i : '\0');
1.21      kristaps  143: }
                    144:
1.1       kristaps  145: const char *
1.57      schwarze  146: mchars_spec2str(const struct mchars *arg,
1.52      kristaps  147:                const char *p, size_t sz, size_t *rsz)
1.1       kristaps  148: {
1.21      kristaps  149:        const struct ln *ln;
1.1       kristaps  150:
1.45      kristaps  151:        ln = find(arg, p, sz);
1.50      schwarze  152:        if (NULL == ln) {
                    153:                *rsz = 1;
1.21      kristaps  154:                return(NULL);
1.50      schwarze  155:        }
1.21      kristaps  156:
1.24      kristaps  157:        *rsz = strlen(ln->ascii);
1.21      kristaps  158:        return(ln->ascii);
1.1       kristaps  159: }
                    160:
1.21      kristaps  161: static const struct ln *
1.52      kristaps  162: find(const struct mchars *tab, const char *p, size_t sz)
1.1       kristaps  163: {
1.52      kristaps  164:        const struct ln  *pp;
1.1       kristaps  165:        int               hash;
                    166:
                    167:        assert(p);
                    168:
1.47      kristaps  169:        if (0 == sz || p[0] < PRINT_LO || p[0] > PRINT_HI)
1.1       kristaps  170:                return(NULL);
                    171:
1.2       kristaps  172:        hash = (int)p[0] - PRINT_LO;
1.1       kristaps  173:
1.47      kristaps  174:        for (pp = tab->htab[hash]; pp; pp = pp->next)
1.57      schwarze  175:                if (0 == strncmp(pp->code, p, sz) &&
                    176:                    '\0' == pp->code[(int)sz])
1.47      kristaps  177:                        return(pp);
1.1       kristaps  178:
                    179:        return(NULL);
                    180: }

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