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Annotation of mandoc/chars.c, Revision 1.46

1.46    ! kristaps    1: /*     $Id: chars.c,v 1.45 2011/05/24 21:24:16 kristaps Exp $ */
1.1       kristaps    2: /*
1.25      schwarze    3:  * Copyright (c) 2009, 2010 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>
1.10      kristaps   24: #include <stdio.h>
1.1       kristaps   25: #include <stdlib.h>
                     26: #include <string.h>
                     27:
1.18      kristaps   28: #include "mandoc.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:
1.45      kristaps   41: #define        LINES_MAX         325
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:
1.45      kristaps   55: static inline int        match(const struct ln *, const char *, size_t);
                     56: static const struct ln  *find(struct mchars *, 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.
                     77:         * Subsequent entries are chained in the order they're processed
                     78:         * (they're in-line re-ordered during lookup).
                     79:         */
                     80:
1.36      kristaps   81:        tab = mandoc_malloc(sizeof(struct mchars));
1.33      kristaps   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:
                    101:
1.21      kristaps  102: /*
                    103:  * Special character to Unicode codepoint.
                    104:  */
                    105: int
1.36      kristaps  106: mchars_spec2cp(struct mchars *arg, const char *p, size_t sz)
1.21      kristaps  107: {
                    108:        const struct ln *ln;
                    109:
1.45      kristaps  110:        ln = find(arg, p, sz);
1.21      kristaps  111:        if (NULL == ln)
                    112:                return(-1);
                    113:        return(ln->unicode);
                    114: }
                    115:
1.32      schwarze  116: /*
1.44      kristaps  117:  * Numbered character string to ASCII codepoint.
1.40      kristaps  118:  * This can only be a printable character (i.e., alnum, punct, space) so
                    119:  * prevent the character from ruining our state (backspace, newline, and
                    120:  * so on).
1.42      kristaps  121:  * If the character is illegal, returns '\0'.
1.32      schwarze  122:  */
1.39      kristaps  123: char
1.36      kristaps  124: mchars_num2char(const char *p, size_t sz)
1.32      schwarze  125: {
                    126:        int               i;
                    127:
1.43      kristaps  128:        if ((i = mandoc_strntou(p, sz, 10)) < 0)
1.39      kristaps  129:                return('\0');
1.44      kristaps  130:        return(isprint(i) ? i : '\0');
                    131: }
                    132:
                    133: /*
                    134:  * Hex character string to Unicode codepoint.
                    135:  * If the character is illegal, returns '\0'.
                    136:  */
                    137: int
                    138: mchars_num2uc(const char *p, size_t sz)
                    139: {
                    140:        int               i;
1.39      kristaps  141:
1.44      kristaps  142:        if ((i = mandoc_strntou(p, sz, 16)) < 0)
                    143:                return('\0');
                    144:        /* FIXME: make sure we're not in a bogus range. */
                    145:        return(i > 0x80 && i <= 0x10FFFF ? i : '\0');
1.21      kristaps  146: }
                    147:
                    148: /*
                    149:  * Special character to string array.
                    150:  */
1.1       kristaps  151: const char *
1.36      kristaps  152: mchars_spec2str(struct mchars *arg, const char *p, size_t sz, size_t *rsz)
1.1       kristaps  153: {
1.21      kristaps  154:        const struct ln *ln;
1.1       kristaps  155:
1.45      kristaps  156:        ln = find(arg, p, sz);
1.21      kristaps  157:        if (NULL == ln)
                    158:                return(NULL);
                    159:
1.24      kristaps  160:        *rsz = strlen(ln->ascii);
1.21      kristaps  161:        return(ln->ascii);
1.1       kristaps  162: }
                    163:
1.21      kristaps  164: static const struct ln *
1.45      kristaps  165: find(struct mchars *tab, const char *p, size_t sz)
1.1       kristaps  166: {
                    167:        struct ln        *pp, *prev;
                    168:        struct ln       **htab;
                    169:        int               hash;
                    170:
                    171:        assert(p);
1.23      kristaps  172:        if (0 == sz)
                    173:                return(NULL);
1.1       kristaps  174:
1.2       kristaps  175:        if (p[0] < PRINT_LO || p[0] > PRINT_HI)
1.1       kristaps  176:                return(NULL);
                    177:
                    178:        /*
                    179:         * Lookup the symbol in the symbol hash.  See ascii2htab for the
                    180:         * hashtable specs.  This dynamically re-orders the hash chain
                    181:         * to optimise for repeat hits.
                    182:         */
                    183:
1.2       kristaps  184:        hash = (int)p[0] - PRINT_LO;
1.1       kristaps  185:        htab = tab->htab;
                    186:
                    187:        if (NULL == (pp = htab[hash]))
                    188:                return(NULL);
                    189:
                    190:        for (prev = NULL; pp; pp = pp->next) {
1.45      kristaps  191:                if ( ! match(pp, p, sz)) {
1.1       kristaps  192:                        prev = pp;
                    193:                        continue;
                    194:                }
                    195:
                    196:                if (prev) {
                    197:                        prev->next = pp->next;
                    198:                        pp->next = htab[hash];
                    199:                        htab[hash] = pp;
                    200:                }
                    201:
1.21      kristaps  202:                return(pp);
1.1       kristaps  203:        }
                    204:
                    205:        return(NULL);
                    206: }
                    207:
                    208: static inline int
1.45      kristaps  209: match(const struct ln *ln, const char *p, size_t sz)
1.1       kristaps  210: {
                    211:
1.22      kristaps  212:        if (strncmp(ln->code, p, sz))
1.1       kristaps  213:                return(0);
1.22      kristaps  214:        return('\0' == ln->code[(int)sz]);
1.1       kristaps  215: }

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