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Annotation of mandoc/chars.c, Revision 1.56

1.56    ! schwarze    1: /*     $Id: chars.c,v 1.55 2014/01/22 20:58:39 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:
1.52      kristaps   55: static const struct ln  *find(const struct mchars *,
                     56:                                const char *, size_t);
1.1       kristaps   57:
                     58: void
1.36      kristaps   59: mchars_free(struct mchars *arg)
1.1       kristaps   60: {
                     61:
1.36      kristaps   62:        free(arg->htab);
                     63:        free(arg);
1.1       kristaps   64: }
                     65:
1.36      kristaps   66: struct mchars *
1.38      kristaps   67: mchars_alloc(void)
1.1       kristaps   68: {
1.36      kristaps   69:        struct mchars    *tab;
1.1       kristaps   70:        struct ln       **htab;
                     71:        struct ln        *pp;
                     72:        int               i, hash;
                     73:
                     74:        /*
                     75:         * Constructs a very basic chaining hashtable.  The hash routine
                     76:         * is simply the integral value of the first character.
1.47      kristaps   77:         * Subsequent entries are chained in the order they're processed.
1.1       kristaps   78:         */
                     79:
1.36      kristaps   80:        tab = mandoc_malloc(sizeof(struct mchars));
1.53      schwarze   81:        htab = mandoc_calloc(PRINT_HI - PRINT_LO + 1, sizeof(struct ln *));
1.1       kristaps   82:
                     83:        for (i = 0; i < LINES_MAX; i++) {
1.2       kristaps   84:                hash = (int)lines[i].code[0] - PRINT_LO;
1.1       kristaps   85:
                     86:                if (NULL == (pp = htab[hash])) {
                     87:                        htab[hash] = &lines[i];
                     88:                        continue;
                     89:                }
                     90:
                     91:                for ( ; pp->next; pp = pp->next)
                     92:                        /* Scan ahead. */ ;
                     93:                pp->next = &lines[i];
                     94:        }
                     95:
                     96:        tab->htab = htab;
                     97:        return(tab);
                     98: }
                     99:
1.21      kristaps  100: int
1.52      kristaps  101: mchars_spec2cp(const struct mchars *arg, const char *p, size_t sz)
1.21      kristaps  102: {
                    103:        const struct ln *ln;
                    104:
1.45      kristaps  105:        ln = find(arg, p, sz);
1.21      kristaps  106:        if (NULL == ln)
                    107:                return(-1);
                    108:        return(ln->unicode);
                    109: }
                    110:
1.39      kristaps  111: char
1.36      kristaps  112: mchars_num2char(const char *p, size_t sz)
1.32      schwarze  113: {
                    114:        int               i;
                    115:
1.48      kristaps  116:        if ((i = mandoc_strntoi(p, sz, 10)) < 0)
1.39      kristaps  117:                return('\0');
1.52      kristaps  118:        return(i > 0 && i < 256 && isprint(i) ?
                    119:                        /* LINTED */ i : '\0');
1.44      kristaps  120: }
                    121:
                    122: int
                    123: mchars_num2uc(const char *p, size_t sz)
                    124: {
                    125:        int               i;
1.39      kristaps  126:
1.48      kristaps  127:        if ((i = mandoc_strntoi(p, sz, 16)) < 0)
1.44      kristaps  128:                return('\0');
                    129:        /* FIXME: make sure we're not in a bogus range. */
                    130:        return(i > 0x80 && i <= 0x10FFFF ? i : '\0');
1.21      kristaps  131: }
                    132:
1.1       kristaps  133: const char *
1.52      kristaps  134: mchars_spec2str(const struct mchars *arg,
                    135:                const char *p, size_t sz, size_t *rsz)
1.1       kristaps  136: {
1.21      kristaps  137:        const struct ln *ln;
1.1       kristaps  138:
1.45      kristaps  139:        ln = find(arg, p, sz);
1.50      schwarze  140:        if (NULL == ln) {
                    141:                *rsz = 1;
1.21      kristaps  142:                return(NULL);
1.50      schwarze  143:        }
1.21      kristaps  144:
1.24      kristaps  145:        *rsz = strlen(ln->ascii);
1.21      kristaps  146:        return(ln->ascii);
1.1       kristaps  147: }
                    148:
1.21      kristaps  149: static const struct ln *
1.52      kristaps  150: find(const struct mchars *tab, const char *p, size_t sz)
1.1       kristaps  151: {
1.52      kristaps  152:        const struct ln  *pp;
1.1       kristaps  153:        int               hash;
                    154:
                    155:        assert(p);
                    156:
1.47      kristaps  157:        if (0 == sz || p[0] < PRINT_LO || p[0] > PRINT_HI)
1.1       kristaps  158:                return(NULL);
                    159:
1.2       kristaps  160:        hash = (int)p[0] - PRINT_LO;
1.1       kristaps  161:
1.47      kristaps  162:        for (pp = tab->htab[hash]; pp; pp = pp->next)
                    163:                if (0 == strncmp(pp->code, p, sz) &&
                    164:                                '\0' == pp->code[(int)sz])
                    165:                        return(pp);
1.1       kristaps  166:
                    167:        return(NULL);
                    168: }

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