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[mandoc.git] / html.c
diff --git a/html.c b/html.c
index ab68ba59ea7446ba3e5c3411a5ba14462f402498..0ad84e4f99d3c7bef88ca28f9ff4d3595a1dee14 100644 (file)
--- a/html.c
+++ b/html.c
@@ -1,4 +1,4 @@
-/*     $Id: html.c,v 1.65 2009/10/20 05:45:21 kristaps Exp $ */
+/*     $Id: html.c,v 1.99 2010/04/12 19:45:39 kristaps Exp $ */
 /*
  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
  *
 /*
  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
  *
@@ -14,13 +14,16 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <sys/types.h>
 #include <sys/types.h>
-#include <sys/queue.h>
 
 #include <assert.h>
 
 #include <assert.h>
-#include <err.h>
-#include <stdio.h>
+#include <ctype.h>
 #include <stdarg.h>
 #include <stdarg.h>
+#include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ -33,41 +36,43 @@
 
 #define        UNCONST(a)      ((void *)(uintptr_t)(const void *)(a))
 
 
 #define        UNCONST(a)      ((void *)(uintptr_t)(const void *)(a))
 
-#define        DOCTYPE         "-//W3C//DTD HTML 4.01//EN"
-#define        DTD             "http://www.w3.org/TR/html4/strict.dtd"
-
 struct htmldata {
        const char       *name;
        int               flags;
 #define        HTML_CLRLINE     (1 << 0)
 #define        HTML_NOSTACK     (1 << 1)
 struct htmldata {
        const char       *name;
        int               flags;
 #define        HTML_CLRLINE     (1 << 0)
 #define        HTML_NOSTACK     (1 << 1)
+#define        HTML_AUTOCLOSE   (1 << 2) /* Tag has auto-closure. */
 };
 
 static const struct htmldata htmltags[TAG_MAX] = {
        {"html",        HTML_CLRLINE}, /* TAG_HTML */
        {"head",        HTML_CLRLINE}, /* TAG_HEAD */
        {"body",        HTML_CLRLINE}, /* TAG_BODY */
 };
 
 static const struct htmldata htmltags[TAG_MAX] = {
        {"html",        HTML_CLRLINE}, /* TAG_HTML */
        {"head",        HTML_CLRLINE}, /* TAG_HEAD */
        {"body",        HTML_CLRLINE}, /* TAG_BODY */
-       {"meta",        HTML_CLRLINE | HTML_NOSTACK}, /* TAG_META */
+       {"meta",        HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_META */
        {"title",       HTML_CLRLINE}, /* TAG_TITLE */
        {"div",         HTML_CLRLINE}, /* TAG_DIV */
        {"h1",          0}, /* TAG_H1 */
        {"h2",          0}, /* TAG_H2 */
        {"title",       HTML_CLRLINE}, /* TAG_TITLE */
        {"div",         HTML_CLRLINE}, /* TAG_DIV */
        {"h1",          0}, /* TAG_H1 */
        {"h2",          0}, /* TAG_H2 */
-       {"p",           HTML_CLRLINE}, /* TAG_P */
        {"span",        0}, /* TAG_SPAN */
        {"span",        0}, /* TAG_SPAN */
-       {"link",        HTML_CLRLINE | HTML_NOSTACK}, /* TAG_LINK */
-       {"br",          HTML_CLRLINE | HTML_NOSTACK}, /* TAG_LINK */
+       {"link",        HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_LINK */
+       {"br",          HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_BR */
        {"a",           0}, /* TAG_A */
        {"table",       HTML_CLRLINE}, /* TAG_TABLE */
        {"a",           0}, /* TAG_A */
        {"table",       HTML_CLRLINE}, /* TAG_TABLE */
-       {"col",         HTML_CLRLINE | HTML_NOSTACK}, /* TAG_COL */
+       {"col",         HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_COL */
        {"tr",          HTML_CLRLINE}, /* TAG_TR */
        {"td",          HTML_CLRLINE}, /* TAG_TD */
        {"li",          HTML_CLRLINE}, /* TAG_LI */
        {"ul",          HTML_CLRLINE}, /* TAG_UL */
        {"ol",          HTML_CLRLINE}, /* TAG_OL */
        {"tr",          HTML_CLRLINE}, /* TAG_TR */
        {"td",          HTML_CLRLINE}, /* TAG_TD */
        {"li",          HTML_CLRLINE}, /* TAG_LI */
        {"ul",          HTML_CLRLINE}, /* TAG_UL */
        {"ol",          HTML_CLRLINE}, /* TAG_OL */
-       {"base",        HTML_CLRLINE | HTML_NOSTACK}, /* TAG_BASE */
 };
 
 };
 
-static const char       *const htmlattrs[ATTR_MAX] = {
+static const char      *const htmlfonts[HTMLFONT_MAX] = {
+       "roman",
+       "bold",
+       "italic"
+};
+
+static const char      *const htmlattrs[ATTR_MAX] = {
        "http-equiv",
        "content",
        "name",
        "http-equiv",
        "content",
        "name",
@@ -81,14 +86,23 @@ static      const char       *const htmlattrs[ATTR_MAX] = {
        "valign",
        "target",
        "id",
        "valign",
        "target",
        "id",
+       "summary",
 };
 
 };
 
-#ifdef __linux__
-extern int               getsubopt(char **, char * const *, char **);
-#endif
+static void              print_spec(struct html *, const char *, size_t);
+static void              print_res(struct html *, const char *, size_t);
+static void              print_ctag(struct html *, enum htmltag);
+static void              print_doctype(struct html *);
+static void              print_xmltype(struct html *);
+static int               print_encode(struct html *, const char *, int);
+static void              print_metaf(struct html *, enum roffdeco);
+static void              print_attr(struct html *, 
+                               const char *, const char *);
+static void             *ml_alloc(char *, enum htmltype);
 
 
-void *
-html_alloc(char *outopts)
+
+static void *
+ml_alloc(char *outopts, enum htmltype type)
 {
        struct html     *h;
        const char      *toks[4];
 {
        struct html     *h;
        const char      *toks[4];
@@ -99,17 +113,17 @@ html_alloc(char *outopts)
        toks[2] = "includes";
        toks[3] = NULL;
 
        toks[2] = "includes";
        toks[3] = NULL;
 
-       if (NULL == (h = calloc(1, sizeof(struct html))))
-               return(NULL);
-
-       SLIST_INIT(&h->tags);
-       SLIST_INIT(&h->ords);
-
-       if (NULL == (h->symtab = chars_init(CHARS_HTML))) {
-               free(h);
-               return(NULL);
+       h = calloc(1, sizeof(struct html));
+       if (NULL == h) {
+               perror(NULL);
+               exit(EXIT_FAILURE);
        }
 
        }
 
+       h->type = type;
+       h->tags.head = NULL;
+       h->ords.head = NULL;
+       h->symtab = chars_init(CHARS_HTML);
+
        while (outopts && *outopts)
                switch (getsubopt(&outopts, UNCONST(toks), &v)) {
                case (0):
        while (outopts && *outopts)
                switch (getsubopt(&outopts, UNCONST(toks), &v)) {
                case (0):
@@ -128,6 +142,21 @@ html_alloc(char *outopts)
        return(h);
 }
 
        return(h);
 }
 
+void *
+html_alloc(char *outopts)
+{
+
+       return(ml_alloc(outopts, HTML_HTML_4_01_STRICT));
+}
+
+
+void *
+xhtml_alloc(char *outopts)
+{
+
+       return(ml_alloc(outopts, HTML_XHTML_1_0_STRICT));
+}
+
 
 void
 html_free(void *p)
 
 void
 html_free(void *p)
@@ -138,15 +167,13 @@ html_free(void *p)
 
        h = (struct html *)p;
 
 
        h = (struct html *)p;
 
-       while ( ! SLIST_EMPTY(&h->ords)) {
-               ord = SLIST_FIRST(&h->ords);
-               SLIST_REMOVE_HEAD(&h->ords, entry);
+       while ((ord = h->ords.head) != NULL) { 
+               h->ords.head = ord->next;
                free(ord);
        }
 
                free(ord);
        }
 
-       while ( ! SLIST_EMPTY(&h->tags)) {
-               tag = SLIST_FIRST(&h->tags);
-               SLIST_REMOVE_HEAD(&h->tags, entry);
+       while ((tag = h->tags.head) != NULL) {
+               h->tags.head = tag->next;       
                free(tag);
        }
        
                free(tag);
        }
        
@@ -189,161 +216,149 @@ print_gen_head(struct html *h)
 
 
 static void
 
 
 static void
-print_spec(struct html *h, const char *p, int len)
+print_spec(struct html *h, const char *p, size_t len)
 {
        const char      *rhs;
 {
        const char      *rhs;
-       int              i;
        size_t           sz;
 
        size_t           sz;
 
-       rhs = chars_a2ascii(h->symtab, p, (size_t)len, &sz);
+       rhs = chars_a2ascii(h->symtab, p, len, &sz);
 
        if (NULL == rhs) 
                return;
 
        if (NULL == rhs) 
                return;
-       for (i = 0; i < (int)sz; i++) 
-               putchar(rhs[i]);
+       fwrite(rhs, 1, sz, stdout);
 }
 
 
 static void
 }
 
 
 static void
-print_res(struct html *h, const char *p, int len)
+print_res(struct html *h, const char *p, size_t len)
 {
        const char      *rhs;
 {
        const char      *rhs;
-       int              i;
        size_t           sz;
 
        size_t           sz;
 
-       rhs = chars_a2res(h->symtab, p, (size_t)len, &sz);
+       rhs = chars_a2res(h->symtab, p, len, &sz);
 
        if (NULL == rhs)
                return;
 
        if (NULL == rhs)
                return;
-       for (i = 0; i < (int)sz; i++) 
-               putchar(rhs[i]);
+       fwrite(rhs, 1, sz, stdout);
 }
 
 
 }
 
 
-static void
-print_escape(struct html *h, const char **p)
+struct tag *
+print_ofont(struct html *h, enum htmlfont font)
 {
 {
-       int              j, type;
-       const char      *wp;
+       struct htmlpair  tag;
 
 
-       wp = *p;
-       type = 1;
+       h->metal = h->metac;
+       h->metac = font;
 
 
-       if (0 == *(++wp)) {
-               *p = wp;
-               return;
+       /* FIXME: DECO_ROMAN should just close out preexisting. */
+
+       if (h->metaf && h->tags.head == h->metaf)
+               print_tagq(h, h->metaf);
+
+       PAIR_CLASS_INIT(&tag, htmlfonts[font]);
+       h->metaf = print_otag(h, TAG_SPAN, 1, &tag);
+       return(h->metaf);
+}
+
+
+static void
+print_metaf(struct html *h, enum roffdeco deco)
+{
+       enum htmlfont    font;
+
+       switch (deco) {
+       case (DECO_PREVIOUS):
+               font = h->metal;
+               break;
+       case (DECO_ITALIC):
+               font = HTMLFONT_ITALIC;
+               break;
+       case (DECO_BOLD):
+               font = HTMLFONT_BOLD;
+               break;
+       case (DECO_ROMAN):
+               font = HTMLFONT_NONE;
+               break;
+       default:
+               abort();
+               /* NOTREACHED */
        }
 
        }
 
-       if ('(' == *wp) {
-               wp++;
-               if (0 == *wp || 0 == *(wp + 1)) {
-                       *p = 0 == *wp ? wp : wp + 1;
-                       return;
-               }
+       (void)print_ofont(h, font);
+}
 
 
-               print_spec(h, wp, 2);
-               *p = ++wp;
-               return;
 
 
-       } else if ('*' == *wp) {
-               if (0 == *(++wp)) {
-                       *p = wp;
-                       return;
-               }
+static int
+print_encode(struct html *h, const char *p, int norecurse)
+{
+       size_t           sz;
+       int              len, nospace;
+       const char      *seq;
+       enum roffdeco    deco;
 
 
-               switch (*wp) {
-               case ('('):
-                       wp++;
-                       if (0 == *wp || 0 == *(wp + 1)) {
-                               *p = 0 == *wp ? wp : wp + 1;
-                               return;
-                       }
+       nospace = 0;
 
 
-                       print_res(h, wp, 2);
-                       *p = ++wp;
-                       return;
-               case ('['):
-                       type = 0;
+       for (; *p; p++) {
+               sz = strcspn(p, "\\<>&");
+
+               fwrite(p, 1, sz, stdout);
+               p += /* LINTED */
+                       sz;
+
+               if ('<' == *p) {
+                       printf("&lt;");
+                       continue;
+               } else if ('>' == *p) {
+                       printf("&gt;");
+                       continue;
+               } else if ('&' == *p) {
+                       printf("&amp;");
+                       continue;
+               } else if ('\0' == *p)
                        break;
                        break;
-               default:
-                       print_res(h, wp, 1);
-                       *p = wp;
-                       return;
-               }
-       
-       } else if ('f' == *wp) {
-               if (0 == *(++wp)) {
-                       *p = wp;
-                       return;
-               }
 
 
-               switch (*wp) {
-               case ('B'):
-                       /* TODO */
+               seq = ++p;
+               len = a2roffdeco(&deco, &seq, &sz);
+
+               switch (deco) {
+               case (DECO_RESERVED):
+                       print_res(h, seq, sz);
                        break;
                        break;
-               case ('I'):
-                       /* TODO */
+               case (DECO_SPECIAL):
+                       print_spec(h, seq, sz);
                        break;
                        break;
-               case ('P'):
+               case (DECO_PREVIOUS):
+                       /* FALLTHROUGH */
+               case (DECO_BOLD):
+                       /* FALLTHROUGH */
+               case (DECO_ITALIC):
                        /* FALLTHROUGH */
                        /* FALLTHROUGH */
-               case ('R'):
-                       /* TODO */
+               case (DECO_ROMAN):
+                       if (norecurse)
+                               break;
+                       print_metaf(h, deco);
                        break;
                default:
                        break;
                }
 
                        break;
                default:
                        break;
                }
 
-               *p = wp;
-               return;
+               p += len - 1;
 
 
-       } else if ('[' != *wp) {
-               print_spec(h, wp, 1);
-               *p = wp;
-               return;
+               if (DECO_NOSPACE == deco && '\0' == *(p + 1))
+                       nospace = 1;
        }
 
        }
 
-       wp++;
-       for (j = 0; *wp && ']' != *wp; wp++, j++)
-               /* Loop... */ ;
-
-       if (0 == *wp) {
-               *p = wp;
-               return;
-       }
-
-       if (type)
-               print_spec(h, wp - j, j);
-       else
-               print_res(h, wp - j, j);
-
-       *p = wp;
+       return(nospace);
 }
 
 
 static void
 }
 
 
 static void
-print_encode(struct html *h, const char *p)
+print_attr(struct html *h, const char *key, const char *val)
 {
 {
-
-       for (; *p; p++) {
-               if ('\\' == *p) {
-                       print_escape(h, &p);
-                       continue;
-               }
-               switch (*p) {
-               case ('<'):
-                       printf("&lt;");
-                       break;
-               case ('>'):
-                       printf("&gt;");
-                       break;
-               case ('&'):
-                       printf("&amp;");
-                       break;
-               default:
-                       putchar(*p);
-                       break;
-               }
-       }
+       printf(" %s=\"", key);
+       (void)print_encode(h, val, 1);
+       putchar('\"');
 }
 
 
 }
 
 
@@ -354,58 +369,120 @@ print_otag(struct html *h, enum htmltag tag,
        int              i;
        struct tag      *t;
 
        int              i;
        struct tag      *t;
 
+       /* Push this tags onto the stack of open scopes. */
+
        if ( ! (HTML_NOSTACK & htmltags[tag].flags)) {
        if ( ! (HTML_NOSTACK & htmltags[tag].flags)) {
-               if (NULL == (t = malloc(sizeof(struct tag))))
-                       err(EXIT_FAILURE, "malloc");
+               t = malloc(sizeof(struct tag));
+               if (NULL == t) {
+                       perror(NULL);
+                       exit(EXIT_FAILURE);
+               }
                t->tag = tag;
                t->tag = tag;
-               SLIST_INSERT_HEAD(&h->tags, t, entry);
+               t->next = h->tags.head;
+               h->tags.head = t;
        } else
                t = NULL;
 
        if ( ! (HTML_NOSPACE & h->flags))
                if ( ! (HTML_CLRLINE & htmltags[tag].flags))
        } else
                t = NULL;
 
        if ( ! (HTML_NOSPACE & h->flags))
                if ( ! (HTML_CLRLINE & htmltags[tag].flags))
-                       printf(" ");
+                       putchar(' ');
+
+       /* Print out the tag name and attributes. */
 
        printf("<%s", htmltags[tag].name);
 
        printf("<%s", htmltags[tag].name);
-       for (i = 0; i < sz; i++) {
-               printf(" %s=\"", htmlattrs[p[i].key]);
-               assert(p->val);
-               print_encode(h, p[i].val);
-               printf("\"");
+       for (i = 0; i < sz; i++)
+               print_attr(h, htmlattrs[p[i].key], p[i].val);
+
+       /* Add non-overridable attributes. */
+
+       if (TAG_HTML == tag && HTML_XHTML_1_0_STRICT == h->type) {
+               print_attr(h, "xmlns", "http://www.w3.org/1999/xhtml");
+               print_attr(h, "xml:lang", "en");
+               print_attr(h, "lang", "en");
        }
        }
-       printf(">");
 
 
-       h->flags |= HTML_NOSPACE;
-       if (HTML_CLRLINE & htmltags[tag].flags)
-               h->flags |= HTML_NEWLINE;
-       else
-               h->flags &= ~HTML_NEWLINE;
+       /* Accomodate for XML "well-formed" singleton escaping. */
+
+       if (HTML_AUTOCLOSE & htmltags[tag].flags)
+               switch (h->type) {
+               case (HTML_XHTML_1_0_STRICT):
+                       putchar('/');
+                       break;
+               default:
+                       break;
+               }
 
 
+       putchar('>');
+
+       h->flags |= HTML_NOSPACE;
        return(t);
 }
 
 
        return(t);
 }
 
 
-/* ARGSUSED */
 static void
 print_ctag(struct html *h, enum htmltag tag)
 {
        
        printf("</%s>", htmltags[tag].name);
 static void
 print_ctag(struct html *h, enum htmltag tag)
 {
        
        printf("</%s>", htmltags[tag].name);
-       if (HTML_CLRLINE & htmltags[tag].flags)
+       if (HTML_CLRLINE & htmltags[tag].flags) {
                h->flags |= HTML_NOSPACE;
                h->flags |= HTML_NOSPACE;
-       if (HTML_CLRLINE & htmltags[tag].flags)
-               h->flags |= HTML_NEWLINE;
-       else
-               h->flags &= ~HTML_NEWLINE;
+               putchar('\n');
+       } 
 }
 
 
 }
 
 
-/* ARGSUSED */
 void
 void
-print_gen_doctype(struct html *h)
+print_gen_decls(struct html *h)
 {
 {
-       
-       printf("<!DOCTYPE HTML PUBLIC \"%s\" \"%s\">", DOCTYPE, DTD);
+
+       print_xmltype(h);
+       print_doctype(h);
+}
+
+
+static void
+print_xmltype(struct html *h)
+{
+       const char      *decl;
+
+       switch (h->type) {
+       case (HTML_XHTML_1_0_STRICT):
+               decl = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
+               break;
+       default:
+               decl = NULL;
+               break;
+       }
+
+       if (NULL == decl)
+               return;
+
+       printf("%s\n", decl);
+}
+
+
+static void
+print_doctype(struct html *h)
+{
+       const char      *doctype;
+       const char      *dtd;
+       const char      *name;
+
+       switch (h->type) {
+       case (HTML_HTML_4_01_STRICT):
+               name = "HTML";
+               doctype = "-//W3C//DTD HTML 4.01//EN";
+               dtd = "http://www.w3.org/TR/html4/strict.dtd";
+               break;
+       default:
+               name = "html";
+               doctype = "-//W3C//DTD XHTML 1.0 Strict//EN";
+               dtd = "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";
+               break;
+       }
+
+       printf("<!DOCTYPE %s PUBLIC \"%s\" \"%s\">\n", 
+                       name, doctype, dtd);
 }
 
 
 }
 
 
@@ -430,8 +507,6 @@ print_text(struct html *h, const char *p)
                case(')'):
                        /* FALLTHROUGH */
                case(']'):
                case(')'):
                        /* FALLTHROUGH */
                case(']'):
-                       /* FALLTHROUGH */
-               case('}'):
                        if ( ! (HTML_IGNDELIM & h->flags))
                                h->flags |= HTML_NOSPACE;
                        break;
                        if ( ! (HTML_IGNDELIM & h->flags))
                                h->flags |= HTML_NOSPACE;
                        break;
@@ -440,21 +515,21 @@ print_text(struct html *h, const char *p)
                }
 
        if ( ! (h->flags & HTML_NOSPACE))
                }
 
        if ( ! (h->flags & HTML_NOSPACE))
-               printf(" ");
-
-       h->flags &= ~HTML_NOSPACE;
-       h->flags &= ~HTML_NEWLINE;
+               putchar(' ');
 
 
-       if (p)
-               print_encode(h, p);
+       assert(p);
+       if ( ! print_encode(h, p, 0))
+               h->flags &= ~HTML_NOSPACE;
 
 
+       /* 
+        * Note that we don't process the pipe: the parser sees it as
+        * punctuation, but we don't in terms of typography.
+        */
        if (*p && 0 == *(p + 1))
                switch (*p) {
                case('('):
                        /* FALLTHROUGH */
                case('['):
        if (*p && 0 == *(p + 1))
                switch (*p) {
                case('('):
                        /* FALLTHROUGH */
                case('['):
-                       /* FALLTHROUGH */
-               case('{'):
                        h->flags |= HTML_NOSPACE;
                        break;
                default:
                        h->flags |= HTML_NOSPACE;
                        break;
                default:
@@ -468,10 +543,11 @@ print_tagq(struct html *h, const struct tag *until)
 {
        struct tag      *tag;
 
 {
        struct tag      *tag;
 
-       while ( ! SLIST_EMPTY(&h->tags)) {
-               tag = SLIST_FIRST(&h->tags);
+       while ((tag = h->tags.head) != NULL) {
+               if (tag == h->metaf)
+                       h->metaf = NULL;
                print_ctag(h, tag->tag);
                print_ctag(h, tag->tag);
-               SLIST_REMOVE_HEAD(&h->tags, entry);
+               h->tags.head = tag->next;
                free(tag);
                if (until && tag == until)
                        return;
                free(tag);
                if (until && tag == until)
                        return;
@@ -484,12 +560,13 @@ print_stagq(struct html *h, const struct tag *suntil)
 {
        struct tag      *tag;
 
 {
        struct tag      *tag;
 
-       while ( ! SLIST_EMPTY(&h->tags)) {
-               tag = SLIST_FIRST(&h->tags);
+       while ((tag = h->tags.head) != NULL) {
                if (suntil && tag == suntil)
                        return;
                if (suntil && tag == suntil)
                        return;
+               if (tag == h->metaf)
+                       h->metaf = NULL;
                print_ctag(h, tag->tag);
                print_ctag(h, tag->tag);
-               SLIST_REMOVE_HEAD(&h->tags, entry);
+               h->tags.head = tag->next;
                free(tag);
        }
 }
                free(tag);
        }
 }
@@ -651,3 +728,30 @@ bufcat_su(struct html *h, const char *p, const struct roffsu *su)
                buffmt(h, "%s: %d%s;", p, (int)v, u);
 }
 
                buffmt(h, "%s: %d%s;", p, (int)v, u);
 }
 
+
+void
+html_idcat(char *dst, const char *src, int sz)
+{
+       int              ssz;
+
+       assert(sz);
+
+       /* Cf. <http://www.w3.org/TR/html4/types.html#h-6.2>. */
+
+       for ( ; *dst != '\0' && sz; dst++, sz--)
+               /* Jump to end. */ ;
+
+       assert(sz > 2);
+
+       /* We can't start with a number (bah). */
+
+       *dst++ = 'x';
+       *dst = '\0';
+       sz--;
+
+       for ( ; *src != '\0' && sz > 1; src++) {
+               ssz = snprintf(dst, (size_t)sz, "%.2x", *src);
+               sz -= ssz;
+               dst += ssz;
+       }
+}
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