General clean-ups.

1 files changed, 595 insertions, 0 deletions

diff --git a/term.c b/term.c
new file mode 100644
index 00000000..180c5075
--- /dev/null
+++ b/term.c
@@ -0,0 +1,595 @@
+/* $Id: term.c,v 1.71 2009/03/31 13:50:19 kristaps Exp $ */
+/*
+ * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@openbsd.org>
+ *
+ * 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 AUTHOR DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+ * AUTHOR 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.
+ */
+#include <assert.h>
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "term.h"
+#include "man.h"
+#include "mdoc.h"
+
+extern	int		  man_run(struct termp *, 
+				const struct man *);
+extern	int		  mdoc_run(struct termp *, 
+				const struct mdoc *);
+
+static	struct termp	 *term_alloc(enum termenc);
+static	void		  term_free(struct termp *);
+static	void		  term_pword(struct termp *, const char *, int);
+static	void		  term_pescape(struct termp *, 
+				const char *, int *, int);
+static	void		  term_nescape(struct termp *,
+				const char *, size_t);
+static	void		  term_chara(struct termp *, char);
+static	void		  term_stringa(struct termp *, 
+				const char *, size_t);
+static	int		  term_isopendelim(const char *, int);
+static	int		  term_isclosedelim(const char *, int);
+
+
+void *
+ascii_alloc(void)
+{
+
+	return(term_alloc(TERMENC_ASCII));
+}
+
+
+int
+terminal_run(void *arg, const struct man *man,
+		const struct mdoc *mdoc)
+{
+	struct termp	*p;
+
+	p = (struct termp *)arg;
+
+	if (NULL == p->symtab)
+		p->symtab = term_ascii2htab();
+
+	if (man)
+		return(man_run(p, man));
+	if (mdoc)
+		return(mdoc_run(p, mdoc));
+
+	return(1);
+}
+
+
+void
+terminal_free(void *arg)
+{
+
+	term_free((struct termp *)arg);
+}
+
+
+static void
+term_free(struct termp *p)
+{
+
+	if (p->buf)
+		free(p->buf);
+	if (TERMENC_ASCII == p->enc && p->symtab)
+		term_asciifree(p->symtab);
+
+	free(p);
+}
+
+
+static struct termp *
+term_alloc(enum termenc enc)
+{
+	struct termp *p;
+
+	if (NULL == (p = malloc(sizeof(struct termp))))
+		err(1, "malloc");
+	bzero(p, sizeof(struct termp));
+	p->maxrmargin = 78;
+	p->enc = enc;
+	return(p);
+}
+
+
+static int
+term_isclosedelim(const char *p, int len)
+{
+
+	if (1 != len)
+		return(0);
+
+	switch (*p) {
+	case('.'):
+		/* FALLTHROUGH */
+	case(','):
+		/* FALLTHROUGH */
+	case(';'):
+		/* FALLTHROUGH */
+	case(':'):
+		/* FALLTHROUGH */
+	case('?'):
+		/* FALLTHROUGH */
+	case('!'):
+		/* FALLTHROUGH */
+	case(')'):
+		/* FALLTHROUGH */
+	case(']'):
+		/* FALLTHROUGH */
+	case('}'):
+		return(1);
+	default:
+		break;
+	}
+
+	return(0);
+}
+
+
+static int
+term_isopendelim(const char *p, int len)
+{
+
+	if (1 != len)
+		return(0);
+
+	switch (*p) {
+	case('('):
+		/* FALLTHROUGH */
+	case('['):
+		/* FALLTHROUGH */
+	case('{'):
+		return(1);
+	default:
+		break;
+	}
+
+	return(0);
+}
+
+
+/*
+ * Flush a line of text.  A "line" is loosely defined as being something
+ * that should be followed by a newline, regardless of whether it's
+ * broken apart by newlines getting there.  A line can also be a
+ * fragment of a columnar list.
+ *
+ * Specifically, a line is whatever's in p->buf of length p->col, which
+ * is zeroed after this function returns.
+ *
+ * The variables TERMP_NOLPAD, TERMP_LITERAL and TERMP_NOBREAK are of
+ * critical importance here.  Their behaviour follows:
+ *
+ *  - TERMP_NOLPAD: when beginning to write the line, don't left-pad the
+ *    offset value.  This is useful when doing columnar lists where the
+ *    prior column has right-padded.
+ *
+ *  - TERMP_NOBREAK: this is the most important and is used when making
+ *    columns.  In short: don't print a newline and instead pad to the
+ *    right margin.  Used in conjunction with TERMP_NOLPAD.
+ *
+ *  - TERMP_NONOBREAK: don't newline when TERMP_NOBREAK is specified.
+ *
+ *  In-line line breaking:
+ *
+ *  If TERMP_NOBREAK is specified and the line overruns the right
+ *  margin, it will break and pad-right to the right margin after
+ *  writing.  If maxrmargin is violated, it will break and continue
+ *  writing from the right-margin, which will lead to the above
+ *  scenario upon exit.
+ *
+ *  Otherwise, the line will break at the right margin.  Extremely long
+ *  lines will cause the system to emit a warning (TODO: hyphenate, if
+ *  possible).
+ */
+void
+term_flushln(struct termp *p)
+{
+	int		 i, j;
+	size_t		 vsz, vis, maxvis, mmax, bp;
+
+	/*
+	 * First, establish the maximum columns of "visible" content.
+	 * This is usually the difference between the right-margin and
+	 * an indentation, but can be, for tagged lists or columns, a
+	 * small set of values.
+	 */
+
+	assert(p->offset < p->rmargin);
+	maxvis = p->rmargin - p->offset;
+	mmax = p->maxrmargin - p->offset;
+	bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
+	vis = 0;
+
+	/*
+	 * If in the standard case (left-justified), then begin with our
+	 * indentation, otherwise (columns, etc.) just start spitting
+	 * out text.
+	 */
+
+	if ( ! (p->flags & TERMP_NOLPAD))
+		/* LINTED */
+		for (j = 0; j < (int)p->offset; j++)
+			putchar(' ');
+
+	for (i = 0; i < (int)p->col; i++) {
+		/*
+		 * Count up visible word characters.  Control sequences
+		 * (starting with the CSI) aren't counted.  A space
+		 * generates a non-printing word, which is valid (the
+		 * space is printed according to regular spacing rules).
+		 */
+
+		/* LINTED */
+		for (j = i, vsz = 0; j < (int)p->col; j++) {
+			if (' ' == p->buf[j])
+				break;
+			else if (8 == p->buf[j])
+				j += 1;
+			else
+				vsz++;
+		}
+
+		/*
+		 * Do line-breaking.  If we're greater than our
+		 * break-point and already in-line, break to the next
+		 * line and start writing.  If we're at the line start,
+		 * then write out the word (TODO: hyphenate) and break
+		 * in a subsequent loop invocation.
+		 */
+
+		if ( ! (TERMP_NOBREAK & p->flags)) {
+			if (vis && vis + vsz > bp) {
+				putchar('\n');
+				for (j = 0; j < (int)p->offset; j++)
+					putchar(' ');
+				vis = 0;
+			} 
+		} else if (vis && vis + vsz > bp) {
+			putchar('\n');
+			for (j = 0; j < (int)p->rmargin; j++)
+				putchar(' ');
+			vis = p->rmargin - p->offset;
+		}
+
+		/* 
+		 * Write out the word and a trailing space.  Omit the
+		 * space if we're the last word in the line or beyond
+		 * our breakpoint.
+		 */
+
+		for ( ; i < (int)p->col; i++) {
+			if (' ' == p->buf[i])
+				break;
+			putchar(p->buf[i]);
+		}
+		vis += vsz;
+		if (i < (int)p->col && vis <= bp) {
+			putchar(' ');
+			vis++;
+		}
+	}
+
+	/*
+	 * If we've overstepped our maximum visible no-break space, then
+	 * cause a newline and offset at the right margin.
+	 */
+
+	if ((TERMP_NOBREAK & p->flags) && vis >= maxvis) {
+		if ( ! (TERMP_NONOBREAK & p->flags)) {
+			putchar('\n');
+			for (i = 0; i < (int)p->rmargin; i++)
+				putchar(' ');
+		}
+		p->col = 0;
+		return;
+	}
+
+	/*
+	 * If we're not to right-marginalise it (newline), then instead
+	 * pad to the right margin and stay off.
+	 */
+
+	if (p->flags & TERMP_NOBREAK) {
+		if ( ! (TERMP_NONOBREAK & p->flags))
+			for ( ; vis < maxvis; vis++)
+				putchar(' ');
+	} else
+		putchar('\n');
+
+	p->col = 0;
+}
+
+
+/* 
+ * A newline only breaks an existing line; it won't assert vertical
+ * space.  All data in the output buffer is flushed prior to the newline
+ * assertion.
+ */
+void
+term_newln(struct termp *p)
+{
+
+	p->flags |= TERMP_NOSPACE;
+	if (0 == p->col) {
+		p->flags &= ~TERMP_NOLPAD;
+		return;
+	}
+	term_flushln(p);
+	p->flags &= ~TERMP_NOLPAD;
+}
+
+
+/*
+ * Asserts a vertical space (a full, empty line-break between lines).
+ * Note that if used twice, this will cause two blank spaces and so on.
+ * All data in the output buffer is flushed prior to the newline
+ * assertion.
+ */
+void
+term_vspace(struct termp *p)
+{
+
+	term_newln(p);
+	putchar('\n');
+}
+
+
+/*
+ * Break apart a word into "pwords" (partial-words, usually from
+ * breaking up a phrase into individual words) and, eventually, put them
+ * into the output buffer.  If we're a literal word, then don't break up
+ * the word and put it verbatim into the output buffer.
+ */
+void
+term_word(struct termp *p, const char *word)
+{
+	int 		 i, j, len;
+
+	len = (int)strlen(word);
+
+	if (p->flags & TERMP_LITERAL) {
+		term_pword(p, word, len);
+		return;
+	}
+
+	/* LINTED */
+	for (j = i = 0; i < len; i++) {
+		if (' ' != word[i]) {
+			j++;
+			continue;
+		} 
+		
+		/* Escaped spaces don't delimit... */
+		if (i && ' ' == word[i] && '\\' == word[i - 1]) {
+			j++;
+			continue;
+		}
+
+		if (0 == j)
+			continue;
+		assert(i >= j);
+		term_pword(p, &word[i - j], j);
+		j = 0;
+	}
+	if (j > 0) {
+		assert(i >= j);
+		term_pword(p, &word[i - j], j);
+	}
+}
+
+
+/*
+ * Determine the symbol indicated by an escape sequences, that is, one
+ * starting with a backslash.  Once done, we pass this value into the
+ * output buffer by way of the symbol table.
+ */
+static void
+term_nescape(struct termp *p, const char *word, size_t len)
+{
+	const char	*rhs;
+	size_t		 sz;
+
+	if (NULL == (rhs = term_a2ascii(p->symtab, word, len, &sz))) 
+		return;
+	term_stringa(p, rhs, sz);
+}
+
+
+/*
+ * Handle an escape sequence: determine its length and pass it to the
+ * escape-symbol look table.  Note that we assume mdoc(3) has validated
+ * the escape sequence (we assert upon badly-formed escape sequences).
+ */
+static void
+term_pescape(struct termp *p, const char *word, int *i, int len)
+{
+	int		 j;
+
+	if (++(*i) >= len)
+		return;
+
+	if ('(' == word[*i]) {
+		(*i)++;
+		if (*i + 1 >= len)
+			return;
+
+		term_nescape(p, &word[*i], 2);
+		(*i)++;
+		return;
+
+	} else if ('*' == word[*i]) { 
+		(*i)++;
+		if (*i >= len)
+			return;
+
+		switch (word[*i]) {
+		case ('('):
+			(*i)++;
+			if (*i + 1 >= len)
+				return;
+
+			term_nescape(p, &word[*i], 2);
+			(*i)++;
+			return;
+		case ('['):
+			break;
+		default:
+			term_nescape(p, &word[*i], 1);
+			return;
+		}
+	
+	} else if ('f' == word[*i]) {
+		(*i)++;
+		if (*i >= len)
+			return;
+		switch (word[*i]) {
+		case ('B'):
+			p->flags |= TERMP_BOLD;
+			break;
+		case ('I'):
+			p->flags |= TERMP_UNDER;
+			break;
+		case ('P'):
+			/* FALLTHROUGH */
+		case ('R'):
+			p->flags &= ~TERMP_STYLE;
+			break;
+		default:
+			break;
+		}
+		return;
+
+	} else if ('[' != word[*i]) {
+		term_nescape(p, &word[*i], 1);
+		return;
+	}
+
+	(*i)++;
+	for (j = 0; word[*i] && ']' != word[*i]; (*i)++, j++)
+		/* Loop... */ ;
+
+	if (0 == word[*i])
+		return;
+
+	term_nescape(p, &word[*i - j], (size_t)j);
+}
+
+
+/*
+ * Handle pwords, partial words, which may be either a single word or a
+ * phrase that cannot be broken down (such as a literal string).  This
+ * handles word styling.
+ */
+static void
+term_pword(struct termp *p, const char *word, int len)
+{
+	int		 i;
+
+	if (term_isclosedelim(word, len))
+		if ( ! (TERMP_IGNDELIM & p->flags))
+			p->flags |= TERMP_NOSPACE;
+
+	if ( ! (TERMP_NOSPACE & p->flags))
+		term_chara(p, ' ');
+
+	if ( ! (p->flags & TERMP_NONOSPACE))
+		p->flags &= ~TERMP_NOSPACE;
+
+	/* 
+	 * If ANSI (word-length styling), then apply our style now,
+	 * before the word.
+	 */
+
+	for (i = 0; i < len; i++) {
+		if ('\\' == word[i]) {
+			term_pescape(p, word, &i, len);
+			continue;
+		}
+
+		if (TERMP_STYLE & p->flags) {
+			if (TERMP_BOLD & p->flags) {
+				term_chara(p, word[i]);
+				term_chara(p, 8);
+			}
+			if (TERMP_UNDER & p->flags) {
+				term_chara(p, '_');
+				term_chara(p, 8);
+			}
+		}
+
+		term_chara(p, word[i]);
+	}
+
+	if (term_isopendelim(word, len))
+		p->flags |= TERMP_NOSPACE;
+}
+
+
+/*
+ * Like term_chara() but for arbitrary-length buffers.  Resize the
+ * buffer by a factor of two (if the buffer is less than that) or the
+ * buffer's size.
+ */
+static void
+term_stringa(struct termp *p, const char *c, size_t sz)
+{
+	size_t		 s;
+
+	if (0 == sz)
+		return;
+
+	assert(c);
+	if (p->col + sz >= p->maxcols) {
+		if (0 == p->maxcols)
+			p->maxcols = 256;
+		s = sz > p->maxcols * 2 ? sz : p->maxcols * 2;
+		p->buf = realloc(p->buf, s);
+		if (NULL == p->buf)
+			err(1, "realloc");
+		p->maxcols = s;
+	}
+
+	(void)memcpy(&p->buf[(int)p->col], c, sz);
+	p->col += sz;
+}
+
+
+/*
+ * Insert a single character into the line-buffer.  If the buffer's
+ * space is exceeded, then allocate more space by doubling the buffer
+ * size.
+ */
+static void
+term_chara(struct termp *p, char c)
+{
+	size_t		 s;
+
+	if (p->col + 1 >= p->maxcols) {
+		if (0 == p->maxcols)
+			p->maxcols = 256;
+		s = p->maxcols * 2;
+		p->buf = realloc(p->buf, s);
+		if (NULL == p->buf)
+			err(1, "realloc");
+		p->maxcols = s;
+	}
+	p->buf[(int)(p->col)++] = c;
+}
+