/* $Id$ */ /* * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons * Copyright (c) 2011-2015, 2017-2021 Ingo Schwarze * Copyright (c) 2022 Anna Vyalkova * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * Common functions for mandoc(1) HTML formatters. * For use by individual formatters and by the main program. */ #include "config.h" #include #include #include #include #include #include #include #include #include #include #include #include "mandoc_aux.h" #include "mandoc_ohash.h" #include "mandoc.h" #include "roff.h" #include "out.h" #include "html.h" #include "manconf.h" #include "main.h" struct htmldata { const char *name; int flags; #define HTML_INPHRASE (1 << 0) /* Can appear in phrasing context. */ #define HTML_TOPHRASE (1 << 1) /* Establishes phrasing context. */ #define HTML_NOSTACK (1 << 2) /* Does not have an end tag. */ #define HTML_NLBEFORE (1 << 3) /* Output line break before opening. */ #define HTML_NLBEGIN (1 << 4) /* Output line break after opening. */ #define HTML_NLEND (1 << 5) /* Output line break before closing. */ #define HTML_NLAFTER (1 << 6) /* Output line break after closing. */ #define HTML_NLAROUND (HTML_NLBEFORE | HTML_NLAFTER) #define HTML_NLINSIDE (HTML_NLBEGIN | HTML_NLEND) #define HTML_NLALL (HTML_NLAROUND | HTML_NLINSIDE) #define HTML_INDENT (1 << 7) /* Indent content by two spaces. */ #define HTML_NOINDENT (1 << 8) /* Exception: never indent content. */ }; static const struct htmldata htmltags[TAG_MAX] = { {"html", HTML_NLALL}, {"head", HTML_NLALL | HTML_INDENT}, {"meta", HTML_NOSTACK | HTML_NLALL}, {"link", HTML_NOSTACK | HTML_NLALL}, {"style", HTML_NLALL | HTML_INDENT}, {"title", HTML_NLAROUND}, {"body", HTML_NLALL}, {"main", HTML_NLALL}, {"div", HTML_NLAROUND}, {"section", HTML_NLALL}, {"nav", HTML_NLALL}, {"table", HTML_NLALL | HTML_INDENT}, {"tr", HTML_NLALL | HTML_INDENT}, {"td", HTML_NLAROUND}, {"li", HTML_NLAROUND | HTML_INDENT}, {"ul", HTML_NLALL | HTML_INDENT}, {"ol", HTML_NLALL | HTML_INDENT}, {"dl", HTML_NLALL | HTML_INDENT}, {"dt", HTML_NLAROUND}, {"dd", HTML_NLAROUND | HTML_INDENT}, {"h2", HTML_TOPHRASE | HTML_NLAROUND}, {"h3", HTML_TOPHRASE | HTML_NLAROUND}, {"p", HTML_TOPHRASE | HTML_NLAROUND | HTML_INDENT}, {"pre", HTML_TOPHRASE | HTML_NLAROUND | HTML_NOINDENT}, {"a", HTML_INPHRASE | HTML_TOPHRASE}, {"b", HTML_INPHRASE | HTML_TOPHRASE}, {"cite", HTML_INPHRASE | HTML_TOPHRASE}, {"code", HTML_INPHRASE | HTML_TOPHRASE}, {"i", HTML_INPHRASE | HTML_TOPHRASE}, {"small", HTML_INPHRASE | HTML_TOPHRASE}, {"span", HTML_INPHRASE | HTML_TOPHRASE}, {"var", HTML_INPHRASE | HTML_TOPHRASE}, {"br", HTML_INPHRASE | HTML_NOSTACK | HTML_NLALL}, {"hr", HTML_INPHRASE | HTML_NOSTACK}, {"mark", HTML_INPHRASE }, {"math", HTML_INPHRASE | HTML_NLALL | HTML_INDENT}, {"mrow", 0}, {"mi", 0}, {"mn", 0}, {"mo", 0}, {"msup", 0}, {"msub", 0}, {"msubsup", 0}, {"mfrac", 0}, {"msqrt", 0}, {"mfenced", 0}, {"mtable", 0}, {"mtr", 0}, {"mtd", 0}, {"munderover", 0}, {"munder", 0}, {"mover", 0}, }; /* Avoid duplicate HTML id= attributes. */ struct id_entry { int ord; /* Ordinal number of the latest occurrence. */ char id[]; /* The id= attribute without any ordinal suffix. */ }; static struct ohash id_unique; static void html_reset_internal(struct html *); static void print_byte(struct html *, char); static void print_endword(struct html *); static void print_indent(struct html *); static void print_word(struct html *, const char *); static void print_ctag(struct html *, struct tag *); static int print_escape(struct html *, char); static int print_encode(struct html *, const char *, const char *, int); static void print_href(struct html *, const char *, const char *, int); static void print_metaf(struct html *); void * html_alloc(const struct manoutput *outopts) { struct html *h; h = mandoc_calloc(1, sizeof(struct html)); h->tag = NULL; h->metac = h->metal = ESCAPE_FONTROMAN; h->style = outopts->style; if ((h->base_man1 = outopts->man) == NULL) h->base_man2 = NULL; else if ((h->base_man2 = strchr(h->base_man1, ';')) != NULL) *h->base_man2++ = '\0'; h->base_includes = outopts->includes; if (outopts->fragment) h->oflags |= HTML_FRAGMENT; if (outopts->toc) h->oflags |= HTML_TOC; mandoc_ohash_init(&id_unique, 4, offsetof(struct id_entry, id)); return h; } static void html_reset_internal(struct html *h) { struct tag *tag; struct id_entry *entry; unsigned int slot; while ((tag = h->tag) != NULL) { h->tag = tag->next; free(tag); } entry = ohash_first(&id_unique, &slot); while (entry != NULL) { free(entry); entry = ohash_next(&id_unique, &slot); } ohash_delete(&id_unique); } void html_reset(void *p) { html_reset_internal(p); mandoc_ohash_init(&id_unique, 4, offsetof(struct id_entry, id)); } void html_free(void *p) { html_reset_internal(p); free(p); } void print_gen_head(struct html *h) { struct tag *t; print_otag(h, TAG_META, "?", "charset", "utf-8"); print_otag(h, TAG_META, "??", "name", "viewport", "content", "width=device-width, initial-scale=1.0"); if (h->style != NULL) { print_otag(h, TAG_LINK, "?h??", "rel", "stylesheet", h->style, "type", "text/css", "media", "all"); return; } /* * Print a minimal embedded style sheet. */ t = print_otag(h, TAG_STYLE, ""); print_text(h, "table.head, table.foot { width: 100%; }"); print_endline(h); print_text(h, "td.head-rtitle, td.foot-os { text-align: right; }"); print_endline(h); print_text(h, "td.head-vol { text-align: center; }"); print_endline(h); print_text(h, ".Nd, .Bf, .Op { display: inline; }"); print_endline(h); print_text(h, ".Pa, .Ad { font-style: italic; }"); print_endline(h); print_text(h, ".Ms { font-weight: bold; }"); print_endline(h); print_text(h, ".Bl-diag "); print_byte(h, '>'); print_text(h, " dt { font-weight: bold; }"); print_endline(h); print_text(h, "code.Nm, .Fl, .Cm, .Ic, code.In, .Fd, .Fn, .Cd " "{ font-weight: bold; font-family: inherit; }"); print_tagq(h, t); } int html_setfont(struct html *h, enum mandoc_esc font) { switch (font) { case ESCAPE_FONTPREV: font = h->metal; break; case ESCAPE_FONTITALIC: case ESCAPE_FONTBOLD: case ESCAPE_FONTBI: case ESCAPE_FONTROMAN: case ESCAPE_FONTCR: case ESCAPE_FONTCB: case ESCAPE_FONTCI: break; case ESCAPE_FONT: font = ESCAPE_FONTROMAN; break; default: return 0; } h->metal = h->metac; h->metac = font; return 1; } static void print_metaf(struct html *h) { if (h->metaf) { print_tagq(h, h->metaf); h->metaf = NULL; } switch (h->metac) { case ESCAPE_FONTITALIC: h->metaf = print_otag(h, TAG_I, ""); break; case ESCAPE_FONTBOLD: h->metaf = print_otag(h, TAG_B, ""); break; case ESCAPE_FONTBI: h->metaf = print_otag(h, TAG_B, ""); print_otag(h, TAG_I, ""); break; case ESCAPE_FONTCR: h->metaf = print_otag(h, TAG_SPAN, "c", "Li"); break; case ESCAPE_FONTCB: h->metaf = print_otag(h, TAG_SPAN, "c", "Li"); print_otag(h, TAG_B, ""); break; case ESCAPE_FONTCI: h->metaf = print_otag(h, TAG_SPAN, "c", "Li"); print_otag(h, TAG_I, ""); break; default: break; } } void html_close_paragraph(struct html *h) { struct tag *this, *next; int flags; this = h->tag; for (;;) { next = this->next; flags = htmltags[this->tag].flags; if (flags & (HTML_INPHRASE | HTML_TOPHRASE)) print_ctag(h, this); if ((flags & HTML_INPHRASE) == 0) break; this = next; } } /* * ROFF_nf switches to no-fill mode, ROFF_fi to fill mode. * TOKEN_NONE does not switch. The old mode is returned. */ enum roff_tok html_fillmode(struct html *h, enum roff_tok want) { struct tag *t; enum roff_tok had; for (t = h->tag; t != NULL; t = t->next) if (t->tag == TAG_PRE) break; had = t == NULL ? ROFF_fi : ROFF_nf; if (want != had) { switch (want) { case ROFF_fi: print_tagq(h, t); break; case ROFF_nf: html_close_paragraph(h); print_otag(h, TAG_PRE, ""); break; case TOKEN_NONE: break; default: abort(); } } return had; } /* * Allocate a string to be used for the "id=" attribute of an HTML * element and/or as a segment identifier for a URI in an element. * The function may fail and return NULL if the node lacks text data * to create the attribute from. * The caller is responsible for free(3)ing the returned string. * * If the "unique" argument is non-zero, the "id_unique" ohash table * is used for de-duplication. If the "unique" argument is 1, * it is the first time the function is called for this tag and * location, so if an ordinal suffix is needed, it is incremented. * If the "unique" argument is 2, it is the second time the function * is called for this tag and location, so the ordinal suffix * remains unchanged. */ char * html_make_id(const struct roff_node *n, int unique) { const struct roff_node *nch; struct id_entry *entry; char *buf, *cp; size_t len; unsigned int slot; if (n->tag != NULL) buf = mandoc_strdup(n->tag); else { switch (n->tok) { case MDOC_Sh: case MDOC_Ss: case MDOC_Sx: case MAN_SH: case MAN_SS: for (nch = n->child; nch != NULL; nch = nch->next) if (nch->type != ROFFT_TEXT) return NULL; buf = NULL; deroff(&buf, n); if (buf == NULL) return NULL; break; default: if (n->child == NULL || n->child->type != ROFFT_TEXT) return NULL; buf = mandoc_strdup(n->child->string); break; } } /* * In ID attributes, only use ASCII characters that are * permitted in URL-fragment strings according to the * explicit list at: * https://url.spec.whatwg.org/#url-fragment-string * In addition, reserve '~' for ordinal suffixes. */ for (cp = buf; *cp != '\0'; cp++) if (isalnum((unsigned char)*cp) == 0 && strchr("!$&'()*+,-./:;=?@_", *cp) == NULL) *cp = '_'; if (unique == 0) return buf; /* Avoid duplicate HTML id= attributes. */ slot = ohash_qlookup(&id_unique, buf); if ((entry = ohash_find(&id_unique, slot)) == NULL) { len = strlen(buf) + 1; entry = mandoc_malloc(sizeof(*entry) + len); entry->ord = 1; memcpy(entry->id, buf, len); ohash_insert(&id_unique, slot, entry); } else if (unique == 1) entry->ord++; if (entry->ord > 1) { cp = buf; mandoc_asprintf(&buf, "%s~%d", cp, entry->ord); free(cp); } return buf; } static int print_escape(struct html *h, char c) { switch (c) { case '<': print_word(h, "<"); break; case '>': print_word(h, ">"); break; case '&': print_word(h, "&"); break; case '"': print_word(h, """); break; case ASCII_NBRSP: print_word(h, " "); break; case ASCII_HYPH: print_byte(h, '-'); break; case ASCII_BREAK: break; default: return 0; } return 1; } static int print_encode(struct html *h, const char *p, const char *pend, int norecurse) { char numbuf[16]; const char *seq; size_t sz; int c, len, breakline, nospace; enum mandoc_esc esc; static const char rejs[10] = { ' ', '\\', '<', '>', '&', '"', ASCII_NBRSP, ASCII_HYPH, ASCII_BREAK, '\0' }; if (pend == NULL) pend = strchr(p, '\0'); breakline = 0; nospace = 0; while (p < pend) { if (HTML_SKIPCHAR & h->flags && '\\' != *p) { h->flags &= ~HTML_SKIPCHAR; p++; continue; } for (sz = strcspn(p, rejs); sz-- && p < pend; p++) print_byte(h, *p); if (breakline && (p >= pend || *p == ' ' || *p == ASCII_NBRSP)) { print_otag(h, TAG_BR, ""); breakline = 0; while (p < pend && (*p == ' ' || *p == ASCII_NBRSP)) p++; continue; } if (p >= pend) break; if (*p == ' ') { print_endword(h); p++; continue; } if (print_escape(h, *p++)) continue; esc = mandoc_escape(&p, &seq, &len); switch (esc) { case ESCAPE_FONT: case ESCAPE_FONTPREV: case ESCAPE_FONTBOLD: case ESCAPE_FONTITALIC: case ESCAPE_FONTBI: case ESCAPE_FONTROMAN: case ESCAPE_FONTCR: case ESCAPE_FONTCB: case ESCAPE_FONTCI: if (0 == norecurse) { h->flags |= HTML_NOSPACE; if (html_setfont(h, esc)) print_metaf(h); h->flags &= ~HTML_NOSPACE; } continue; case ESCAPE_SKIPCHAR: h->flags |= HTML_SKIPCHAR; continue; case ESCAPE_ERROR: continue; default: break; } if (h->flags & HTML_SKIPCHAR) { h->flags &= ~HTML_SKIPCHAR; continue; } switch (esc) { case ESCAPE_UNICODE: /* Skip past "u" header. */ c = mchars_num2uc(seq + 1, len - 1); break; case ESCAPE_NUMBERED: c = mchars_num2char(seq, len); if (c < 0) continue; break; case ESCAPE_SPECIAL: c = mchars_spec2cp(seq, len); if (c <= 0) continue; break; case ESCAPE_UNDEF: c = *seq; break; case ESCAPE_DEVICE: print_word(h, "html"); continue; case ESCAPE_BREAK: breakline = 1; continue; case ESCAPE_NOSPACE: if ('\0' == *p) nospace = 1; continue; case ESCAPE_OVERSTRIKE: if (len == 0) continue; c = seq[len - 1]; break; default: continue; } if ((c < 0x20 && c != 0x09) || (c > 0x7E && c < 0xA0)) c = 0xFFFD; if (c > 0x7E) { (void)snprintf(numbuf, sizeof(numbuf), "&#x%.4X;", c); print_word(h, numbuf); } else if (print_escape(h, c) == 0) print_byte(h, c); } return nospace; } static void print_href(struct html *h, const char *name, const char *sec, int man) { struct stat sb; const char *p, *pp; char *filename; if (man) { pp = h->base_man1; if (h->base_man2 != NULL) { mandoc_asprintf(&filename, "%s.%s", name, sec); if (stat(filename, &sb) == -1) pp = h->base_man2; free(filename); } } else pp = h->base_includes; while ((p = strchr(pp, '%')) != NULL) { print_encode(h, pp, p, 1); if (man && p[1] == 'S') { if (sec == NULL) print_byte(h, '1'); else print_encode(h, sec, NULL, 1); } else if ((man && p[1] == 'N') || (man == 0 && p[1] == 'I')) print_encode(h, name, NULL, 1); else print_encode(h, p, p + 2, 1); pp = p + 2; } if (*pp != '\0') print_encode(h, pp, NULL, 1); } struct tag * print_otag(struct html *h, enum htmltag tag, const char *fmt, ...) { va_list ap; struct tag *t; const char *attr; char *arg1, *arg2; int style_written, tflags; tflags = htmltags[tag].flags; /* Flow content is not allowed in phrasing context. */ if ((tflags & HTML_INPHRASE) == 0) { for (t = h->tag; t != NULL; t = t->next) { if (t->closed) continue; assert((htmltags[t->tag].flags & HTML_TOPHRASE) == 0); break; } /* * Always wrap phrasing elements in a paragraph * unless already contained in some flow container; * never put them directly into a section. */ } else if (tflags & HTML_TOPHRASE && h->tag->tag == TAG_SECTION) print_otag(h, TAG_P, "c", "Pp"); /* Push this tag onto the stack of open scopes. */ if ((tflags & HTML_NOSTACK) == 0) { t = mandoc_malloc(sizeof(struct tag)); t->tag = tag; t->next = h->tag; t->refcnt = 0; t->closed = 0; h->tag = t; } else t = NULL; if (tflags & HTML_NLBEFORE) print_endline(h); if (h->col == 0) print_indent(h); else if ((h->flags & HTML_NOSPACE) == 0) { if (h->flags & HTML_KEEP) print_word(h, " "); else { if (h->flags & HTML_PREKEEP) h->flags |= HTML_KEEP; print_endword(h); } } if ( ! (h->flags & HTML_NONOSPACE)) h->flags &= ~HTML_NOSPACE; else h->flags |= HTML_NOSPACE; /* Print out the tag name and attributes. */ print_byte(h, '<'); print_word(h, htmltags[tag].name); va_start(ap, fmt); while (*fmt != '\0' && *fmt != 's') { /* Parse attributes and arguments. */ arg1 = va_arg(ap, char *); arg2 = NULL; switch (*fmt++) { case 'c': attr = "class"; break; case 'h': attr = "href"; break; case 'i': attr = "id"; break; case 'r': attr = "role"; break; case '?': attr = arg1; arg1 = va_arg(ap, char *); break; default: abort(); } if (*fmt == 'M') arg2 = va_arg(ap, char *); if (arg1 == NULL) continue; /* Print the attributes. */ print_byte(h, ' '); print_word(h, attr); print_byte(h, '='); print_byte(h, '"'); switch (*fmt) { case 'I': print_href(h, arg1, NULL, 0); fmt++; break; case 'M': print_href(h, arg1, arg2, 1); fmt++; break; case 'R': print_byte(h, '#'); print_encode(h, arg1, NULL, 1); fmt++; break; default: print_encode(h, arg1, NULL, 1); break; } print_byte(h, '"'); } style_written = 0; while (*fmt++ == 's') { arg1 = va_arg(ap, char *); arg2 = va_arg(ap, char *); if (arg2 == NULL) continue; print_byte(h, ' '); if (style_written == 0) { print_word(h, "style=\""); style_written = 1; } print_word(h, arg1); print_byte(h, ':'); print_byte(h, ' '); print_word(h, arg2); print_byte(h, ';'); } if (style_written) print_byte(h, '"'); va_end(ap); /* Accommodate for "well-formed" singleton escaping. */ if (htmltags[tag].flags & HTML_NOSTACK) print_byte(h, '/'); print_byte(h, '>'); if (tflags & HTML_NLBEGIN) print_endline(h); else h->flags |= HTML_NOSPACE; if (tflags & HTML_INDENT) h->indent++; if (tflags & HTML_NOINDENT) h->noindent++; return t; } /* * Print an element with an optional "id=" attribute. * If the element has phrasing content and an "id=" attribute, * also add a permalink: outside if it can be in phrasing context, * inside otherwise. */ struct tag * print_otag_id(struct html *h, enum htmltag elemtype, const char *cattr, struct roff_node *n) { struct roff_node *nch; struct tag *ret, *t; char *id, *href; ret = NULL; id = href = NULL; if (n->flags & NODE_ID) id = html_make_id(n, 1); if (n->flags & NODE_HREF) href = id == NULL ? html_make_id(n, 2) : id; if (href != NULL && htmltags[elemtype].flags & HTML_INPHRASE) ret = print_otag(h, TAG_A, "chR", "permalink", href); t = print_otag(h, elemtype, "ci", cattr, id); if (ret == NULL) { ret = t; if (href != NULL && (nch = n->child) != NULL) { /* man(7) is safe, it tags phrasing content only. */ if (n->tok > MDOC_MAX || htmltags[elemtype].flags & HTML_TOPHRASE) nch = NULL; else /* For mdoc(7), beware of nested blocks. */ while (nch != NULL && nch->type == ROFFT_TEXT) nch = nch->next; if (nch == NULL) print_otag(h, TAG_A, "chR", "permalink", href); } } free(id); if (id == NULL) free(href); return ret; } static void print_ctag(struct html *h, struct tag *tag) { int tflags; if (tag->closed == 0) { tag->closed = 1; if (tag == h->metaf) h->metaf = NULL; if (tag == h->tblt) h->tblt = NULL; tflags = htmltags[tag->tag].flags; if (tflags & HTML_INDENT) h->indent--; if (tflags & HTML_NOINDENT) h->noindent--; if (tflags & HTML_NLEND) print_endline(h); print_indent(h); print_byte(h, '<'); print_byte(h, '/'); print_word(h, htmltags[tag->tag].name); print_byte(h, '>'); if (tflags & HTML_NLAFTER) print_endline(h); } if (tag->refcnt == 0) { h->tag = tag->next; free(tag); } } void print_gen_decls(struct html *h) { print_word(h, ""); print_endline(h); } void print_gen_comment(struct html *h, struct roff_node *n) { int wantblank; print_word(h, "") == NULL && (wantblank || *n->string != '\0')) { print_endline(h); print_indent(h); print_word(h, n->string); wantblank = *n->string != '\0'; } n = n->next; } if (wantblank) print_endline(h); print_word(h, " -->"); print_endline(h); h->indent = 0; } void print_text(struct html *h, const char *word) { print_tagged_text(h, word, NULL); } void print_tagged_text(struct html *h, const char *word, struct roff_node *n) { struct tag *t; char *href; /* * Always wrap text in a paragraph unless already contained in * some flow container; never put it directly into a section. */ if (h->tag->tag == TAG_SECTION) print_otag(h, TAG_P, "c", "Pp"); /* Output whitespace before this text? */ if (h->col && (h->flags & HTML_NOSPACE) == 0) { if ( ! (HTML_KEEP & h->flags)) { if (HTML_PREKEEP & h->flags) h->flags |= HTML_KEEP; print_endword(h); } else print_word(h, " "); } /* * Optionally switch fonts, optionally write a permalink, then * print the text, optionally surrounded by HTML whitespace. */ assert(h->metaf == NULL); print_metaf(h); print_indent(h); if (n != NULL && (href = html_make_id(n, 2)) != NULL) { t = print_otag(h, TAG_A, "chR", "permalink", href); free(href); } else t = NULL; if ( ! print_encode(h, word, NULL, 0)) { if ( ! (h->flags & HTML_NONOSPACE)) h->flags &= ~HTML_NOSPACE; h->flags &= ~HTML_NONEWLINE; } else h->flags |= HTML_NOSPACE | HTML_NONEWLINE; if (h->metaf != NULL) { print_tagq(h, h->metaf); h->metaf = NULL; } else if (t != NULL) print_tagq(h, t); h->flags &= ~HTML_IGNDELIM; } void print_tagq(struct html *h, const struct tag *until) { struct tag *this, *next; for (this = h->tag; this != NULL; this = next) { next = this == until ? NULL : this->next; print_ctag(h, this); } } /* * Close out all open elements up to but excluding suntil. * Note that a paragraph just inside stays open together with it * because paragraphs include subsequent phrasing content. */ void print_stagq(struct html *h, const struct tag *suntil) { struct tag *this, *next; for (this = h->tag; this != NULL; this = next) { next = this->next; if (this == suntil || (next == suntil && (this->tag == TAG_P || this->tag == TAG_PRE))) break; print_ctag(h, this); } } /*********************************************************************** * Low level output functions. * They implement line breaking using a short static buffer. ***********************************************************************/ /* * Buffer one HTML output byte. * If the buffer is full, flush and deactivate it and start a new line. * If the buffer is inactive, print directly. */ static void print_byte(struct html *h, char c) { if ((h->flags & HTML_BUFFER) == 0) { putchar(c); h->col++; return; } if (h->col + h->bufcol < sizeof(h->buf)) { h->buf[h->bufcol++] = c; return; } putchar('\n'); h->col = 0; print_indent(h); putchar(' '); putchar(' '); fwrite(h->buf, h->bufcol, 1, stdout); putchar(c); h->col = (h->indent + 1) * 2 + h->bufcol + 1; h->bufcol = 0; h->flags &= ~HTML_BUFFER; } /* * If something was printed on the current output line, end it. * Not to be called right after print_indent(). */ void print_endline(struct html *h) { if (h->col == 0) return; if (h->bufcol) { putchar(' '); fwrite(h->buf, h->bufcol, 1, stdout); h->bufcol = 0; } putchar('\n'); h->col = 0; h->flags |= HTML_NOSPACE; h->flags &= ~HTML_BUFFER; } /* * Flush the HTML output buffer. * If it is inactive, activate it. */ static void print_endword(struct html *h) { if (h->noindent) { print_byte(h, ' '); return; } if ((h->flags & HTML_BUFFER) == 0) { h->col++; h->flags |= HTML_BUFFER; } else if (h->bufcol) { putchar(' '); fwrite(h->buf, h->bufcol, 1, stdout); h->col += h->bufcol + 1; } h->bufcol = 0; } /* * If at the beginning of a new output line, * perform indentation and mark the line as containing output. * Make sure to really produce some output right afterwards, * but do not use print_otag() for producing it. */ static void print_indent(struct html *h) { size_t i; if (h->col || h->noindent) return; h->col = h->indent * 2; for (i = 0; i < h->col; i++) putchar(' '); } /* * Print or buffer some characters * depending on the current HTML output buffer state. */ static void print_word(struct html *h, const char *cp) { while (*cp != '\0') print_byte(h, *cp++); }