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Annotation of mandoc/term_ascii.c, Revision 1.7

1.7     ! kristaps    1: /*     $Id: term_ascii.c,v 1.6 2010/06/25 19:50:23 kristaps Exp $ */
1.1       kristaps    2: /*
1.4       kristaps    3:  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv>
1.1       kristaps    4:  *
                      5:  * Permission to use, copy, modify, and distribute this software for any
                      6:  * purpose with or without fee is hereby granted, provided that the above
                      7:  * copyright notice and this permission notice appear in all copies.
                      8:  *
                      9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     16:  */
                     17: #ifdef HAVE_CONFIG_H
                     18: #include "config.h"
                     19: #endif
                     20:
                     21: #include <sys/types.h>
                     22:
                     23: #include <assert.h>
                     24: #include <stdint.h>
                     25: #include <stdio.h>
                     26: #include <stdlib.h>
1.2       kristaps   27: #include <unistd.h>
1.1       kristaps   28:
                     29: #include "out.h"
                     30: #include "term.h"
                     31: #include "main.h"
                     32:
1.7     ! kristaps   33: static size_t            ascii_hspan(const struct termp *,
        !            34:                                const struct roffsu *);
        !            35: static size_t            ascii_width(const struct termp *, char);
        !            36: static void              ascii_advance(struct termp *, size_t);
        !            37: static void              ascii_begin(struct termp *);
        !            38: static void              ascii_end(struct termp *);
1.1       kristaps   39: static void              ascii_endline(struct termp *);
                     40: static void              ascii_letter(struct termp *, char);
                     41:
                     42:
                     43: void *
                     44: ascii_alloc(char *outopts)
                     45: {
                     46:        struct termp    *p;
                     47:        const char      *toks[2];
                     48:        char            *v;
                     49:
                     50:        if (NULL == (p = term_alloc(TERMENC_ASCII)))
                     51:                return(NULL);
                     52:
1.5       kristaps   53:        p->tabwidth = 5;
                     54:        p->defrmargin = 78;
                     55:
1.7     ! kristaps   56:        p->advance = ascii_advance;
1.1       kristaps   57:        p->begin = ascii_begin;
                     58:        p->end = ascii_end;
                     59:        p->endline = ascii_endline;
1.7     ! kristaps   60:        p->hspan = ascii_hspan;
        !            61:        p->letter = ascii_letter;
        !            62:        p->type = TERMTYPE_CHAR;
1.5       kristaps   63:        p->width = ascii_width;
1.1       kristaps   64:
                     65:        toks[0] = "width";
                     66:        toks[1] = NULL;
                     67:
                     68:        while (outopts && *outopts)
                     69:                switch (getsubopt(&outopts, UNCONST(toks), &v)) {
                     70:                case (0):
                     71:                        p->defrmargin = (size_t)atoi(v);
                     72:                        break;
                     73:                default:
                     74:                        break;
                     75:                }
                     76:
                     77:        /* Enforce a lower boundary. */
                     78:        if (p->defrmargin < 58)
                     79:                p->defrmargin = 58;
                     80:
                     81:        return(p);
1.5       kristaps   82: }
                     83:
                     84:
1.6       kristaps   85: /* ARGSUSED */
1.5       kristaps   86: static size_t
                     87: ascii_width(const struct termp *p, char c)
                     88: {
                     89:
                     90:        return(1);
1.1       kristaps   91: }
                     92:
                     93:
                     94: void
                     95: ascii_free(void *arg)
                     96: {
                     97:
                     98:        term_free((struct termp *)arg);
                     99: }
                    100:
                    101:
                    102: /* ARGSUSED */
                    103: static void
                    104: ascii_letter(struct termp *p, char c)
                    105: {
                    106:
                    107:        putchar(c);
                    108: }
                    109:
                    110:
                    111: static void
                    112: ascii_begin(struct termp *p)
                    113: {
                    114:
                    115:        (*p->headf)(p, p->argf);
                    116: }
                    117:
                    118:
                    119: static void
                    120: ascii_end(struct termp *p)
                    121: {
                    122:
                    123:        (*p->footf)(p, p->argf);
                    124: }
                    125:
                    126:
                    127: /* ARGSUSED */
                    128: static void
                    129: ascii_endline(struct termp *p)
                    130: {
                    131:
                    132:        putchar('\n');
                    133: }
                    134:
                    135:
                    136: /* ARGSUSED */
                    137: static void
                    138: ascii_advance(struct termp *p, size_t len)
                    139: {
                    140:        size_t          i;
                    141:
                    142:        /* Just print whitespace on the terminal. */
                    143:        for (i = 0; i < len; i++)
                    144:                putchar(' ');
                    145: }
1.7     ! kristaps  146:
        !           147:
        !           148: /* ARGSUSED */
        !           149: static size_t
        !           150: ascii_hspan(const struct termp *p, const struct roffsu *su)
        !           151: {
        !           152:        double           r;
        !           153:
        !           154:        /*
        !           155:         * Approximate based on character width.  These are generated
        !           156:         * entirely by eyeballing the screen, but appear to be correct.
        !           157:         */
        !           158:
        !           159:        switch (su->unit) {
        !           160:        case (SCALE_CM):
        !           161:                r = 4 * su->scale;
        !           162:                break;
        !           163:        case (SCALE_IN):
        !           164:                r = 10 * su->scale;
        !           165:                break;
        !           166:        case (SCALE_PC):
        !           167:                r = (10 * su->scale) / 6;
        !           168:                break;
        !           169:        case (SCALE_PT):
        !           170:                r = (10 * su->scale) / 72;
        !           171:                break;
        !           172:        case (SCALE_MM):
        !           173:                r = su->scale / 1000;
        !           174:                break;
        !           175:        case (SCALE_VS):
        !           176:                r = su->scale * 2 - 1;
        !           177:                break;
        !           178:        default:
        !           179:                r = su->scale;
        !           180:                break;
        !           181:        }
        !           182:
        !           183:        /* Explicitly disallow negative values. */
        !           184:
        !           185:        if (r < 0.0)
        !           186:                r = 0.0;
        !           187:
        !           188:        return((size_t)/* LINTED */
        !           189:                        r);
        !           190: }
        !           191:

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