From 86f3195293e0fc04a8930e13107efd5e54ca8fcf Mon Sep 17 00:00:00 2001
From: Niall O'Higgins <niallo@cvs.openbsd.org>
Date: Fri, 12 Jan 2007 23:32:02 +0000
Subject: major re-work of the RCS api.  this results in 100x performance
 improvements in some places and much reduced memory usage.  note that only
 checkout has been fully converted to use the new high-performance functions. 
 other codepaths (e.g. update) still use the old method which is provided for
 backwards compatibility.  we can convert the remaining slow bits over to the
 new api piece-by-piece.

"commit this, now" joris@
brad@ tested, too.
---
 usr.bin/cvs/rcs.c | 428 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 414 insertions(+), 14 deletions(-)

(limited to 'usr.bin/cvs/rcs.c')

diff --git a/usr.bin/cvs/rcs.c b/usr.bin/cvs/rcs.c
index 14d5dd7f729..1ec2c8fb66b 100644
--- a/usr.bin/cvs/rcs.c
+++ b/usr.bin/cvs/rcs.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: rcs.c,v 1.195 2007/01/12 19:28:12 joris Exp $	*/
+/*	$OpenBSD: rcs.c,v 1.196 2007/01/12 23:32:01 niallo Exp $	*/
 /*
  * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
  * All rights reserved.
@@ -236,6 +236,8 @@ static void	rcs_growbuf(RCSFILE *);
 static void	rcs_strprint(const u_char *, size_t, FILE *);
 
 static BUF	*rcs_expand_keywords(char *, struct rcs_delta *, BUF *, int);
+static void	rcs_kwexp_line(char *, struct rcs_delta *, struct cvs_line *,
+		    int mode);
 
 RCSFILE *
 rcs_open(const char *path, int fd, int flags, ...)
@@ -1404,25 +1406,15 @@ rcs_rev_remove(RCSFILE *rf, RCSNUM *rev)
 	newdeltatext = NULL;
 	prevbuf = nextbuf = NULL;
 
-	if (prevrdp != NULL) {
-		if ((prevbuf = rcs_getrev(rf, prevrdp->rd_num)) == NULL)
-			fatal("error getting revision");
-	}
-
 	if (prevrdp != NULL && nextrdp != NULL) {
-		if ((nextbuf = rcs_getrev(rf, nextrdp->rd_num)) == NULL)
-			fatal("error getting revision");
-
 		newdiff = cvs_buf_alloc(64, BUF_AUTOEXT);
 
 		/* calculate new diff */
 		(void)xasprintf(&path_tmp1, "%s/diff1.XXXXXXXXXX", cvs_tmpdir);
-		cvs_buf_write_stmp(nextbuf, path_tmp1, NULL);
-		cvs_buf_free(nextbuf);
+		rcs_rev_write_stmp(rf, nextrdp->rd_num, path_tmp1, 0);
 
 		(void)xasprintf(&path_tmp2, "%s/diff2.XXXXXXXXXX", cvs_tmpdir);
-		cvs_buf_write_stmp(prevbuf, path_tmp2, NULL);
-		cvs_buf_free(prevbuf);
+		rcs_rev_write_stmp(rf, prevrdp->rd_num, path_tmp2, 0);
 
 		diff_format = D_RCSDIFF;
 		if (cvs_diffreg(path_tmp1, path_tmp2, newdiff) == D_ERROR)
@@ -2600,7 +2592,6 @@ rcs_expand_keywords(char *rcsfile, struct rcs_delta *rdp, BUF *bp, int mode)
 	u_int j, found;
 	u_char *c, *kwstr, *start, *end, *fin;
 	char expbuf[256], buf[256];
-	struct tm tb;
 	char *fmt;
 	size_t len;
 
@@ -3038,3 +3029,412 @@ rcs_translate_tag(const char *revstr, RCSFILE *rfp)
 
 	return (rev);
 }
+
+/*
+ * rcs_rev_getlines()
+ *
+ * Get the entire contents of revision <rev> from the RCSFILE <rfp> and
+ * return it as a pointer to a struct cvs_lines.
+ */
+struct cvs_lines *
+rcs_rev_getlines(RCSFILE *rfp, RCSNUM *frev)
+{
+	size_t i, plen;
+	int done, nextroot, found;
+	RCSNUM *tnum, *bnum;
+	struct rcs_branch *brp;
+	struct rcs_delta *hrdp, *trdp, *rdp;
+	u_char *patch;
+	struct cvs_lines *dlines, *plines;
+
+	if ((hrdp = rcs_findrev(rfp, rfp->rf_head)) == NULL)
+		fatal("rcs_rev_write_fd: no HEAD revision");
+
+	tnum = frev;
+	rcs_parse_deltatexts(rfp, hrdp->rd_num);
+
+	/* revision on branch, get the branch root */
+	nextroot = 2;
+	if (RCSNUM_ISBRANCHREV(tnum)) {
+		bnum = rcsnum_alloc();
+		rcsnum_cpy(tnum, bnum, nextroot);
+	} else {
+		bnum = tnum;
+	}
+
+	dlines = cvs_splitlines(hrdp->rd_text, hrdp->rd_tlen);
+
+	done = 0;
+
+	rdp = hrdp;
+	if (!rcsnum_differ(rdp->rd_num, bnum))
+		goto next;
+
+	if ((rdp = rcs_findrev(rfp, hrdp->rd_next)) == NULL)
+		goto done;
+
+again:
+	for (;;) {
+		if (rdp->rd_next->rn_len != 0) {
+			trdp = rcs_findrev(rfp, rdp->rd_next);
+			if (trdp == NULL)
+				fatal("failed to grab next revision");
+		}
+
+		if (rdp->rd_tlen == 0) {
+			rcs_parse_deltatexts(rfp, rdp->rd_num);
+			if (rdp->rd_tlen == 0) {
+				if (!rcsnum_differ(rdp->rd_num, bnum))
+					break;
+				rdp = trdp;
+				continue;
+			}
+		}
+
+		plen = rdp->rd_tlen;
+		patch = rdp->rd_text;
+		plines = cvs_splitlines(patch, plen);
+		rcs_patch_lines(dlines, plines);
+		cvs_freelines(plines);
+
+		if (!rcsnum_differ(rdp->rd_num, bnum))
+			break;
+
+		rdp = trdp;
+	}
+
+next:
+	if (!rcsnum_differ(rdp->rd_num, frev))
+		done = 1;
+
+	if (RCSNUM_ISBRANCHREV(frev) && done != 1) {
+		nextroot += 2;
+		rcsnum_cpy(frev, bnum, nextroot);
+
+		TAILQ_FOREACH(brp, &(rdp->rd_branches), rb_list) {
+			found = 1;
+			for (i = 0; i < nextroot - 1; i++) {
+				if (brp->rb_num->rn_id[i] != bnum->rn_id[i]) {
+					found = 0;
+					break;
+				}
+			}
+
+			break;
+		}
+
+		if (brp == NULL)
+			fatal("expected branch not found on branch list");
+
+		if ((rdp = rcs_findrev(rfp, brp->rb_num)) == NULL)
+			fatal("rcs_rev_write_fd: failed to get delta for target rev");
+
+		goto again;
+	}
+done:
+	if (bnum != tnum)
+		rcsnum_free(bnum);
+
+	return (dlines);
+}
+
+/*
+ * rcs_rev_getbuf()
+ *
+ * XXX: This is really really slow and should be avoided if at all possible!
+ *
+ * Get the entire contents of revision <rev> from the RCSFILE <rfp> and
+ * return it as a BUF pointer.
+ */
+BUF *
+rcs_rev_getbuf(RCSFILE *rfp, RCSNUM *rev)
+{
+	struct cvs_lines *lines;
+	struct cvs_line *lp;
+	BUF *bp;
+
+	lines = rcs_rev_getlines(rfp, rev);
+	bp = cvs_buf_alloc(1024, BUF_AUTOEXT);
+	TAILQ_FOREACH(lp, &lines->l_lines, l_list) {
+		if (lp->l_line == NULL)
+			continue;
+		cvs_buf_append(bp, lp->l_line, lp->l_len);
+	}
+
+	cvs_freelines(lines);
+
+	return (bp);
+}
+
+/*
+ * rcs_rev_write_fd()
+ *
+ * Write the entire contents of revision <frev> from the rcsfile <rfp> to
+ * file descriptor <fd>.
+ */
+void
+rcs_rev_write_fd(RCSFILE *rfp, RCSNUM *rev, int fd, int mode)
+{
+	int expmode;
+	struct rcs_delta *rdp;
+	struct cvs_lines *lines;
+	struct cvs_line *lp;
+
+	lines = rcs_rev_getlines(rfp, rev);
+	/* keyword expansion if necessary */
+	if (!(mode & RCS_KWEXP_NONE)) {
+		if (rfp->rf_expand != NULL)
+			expmode = rcs_kwexp_get(rfp);
+		else
+			expmode = RCS_KWEXP_DEFAULT;
+
+		if (!(expmode & RCS_KWEXP_NONE)) {
+			if ((rdp = rcs_findrev(rfp, rev)) == NULL)
+				fatal("could not fetch revision");
+			rcs_kwexp_lines(rfp->rf_path, rdp, lines, expmode);
+		}
+	}
+	TAILQ_FOREACH(lp, &lines->l_lines, l_list) {
+		if (lp->l_line == NULL)
+			continue;
+		if (write(fd, lp->l_line, lp->l_len) == -1)
+			fatal("rcs_rev_write_fd: %s", strerror(errno));
+	}
+
+	/* XXX: do we need to call futimes(2) on the output fd? */
+
+	cvs_freelines(lines);
+
+}
+
+/*
+ * rcs_rev_write_stmp()
+ *
+ * Write the contents of the rev <rev> to a temporary file whose path is
+ * specified using <template> (see mkstemp(3)). NB. This function will modify
+ * <template>, as per mkstemp.
+ */
+void
+rcs_rev_write_stmp(RCSFILE *rfp,  RCSNUM *rev, char *template, int mode)
+{
+	int fd;
+
+	if ((fd = mkstemp(template)) == -1)
+		fatal("mkstemp: `%s': %s", template, strerror(errno));
+
+	cvs_worklist_add(template, &temp_files);
+	rcs_rev_write_fd(rfp, rev, fd, mode);
+
+	(void)close(fd);
+}
+
+static void
+rcs_kwexp_line(char *rcsfile, struct rcs_delta *rdp, struct cvs_line *line,
+    int mode)
+{
+	int kwtype;
+	u_int j, found;
+	u_char *c, *kwstr, *start, *end, *fin;
+	char expbuf[256], buf[256];
+	char *fmt;
+	size_t len;
+
+	kwtype = 0;
+	kwstr = NULL;
+
+	len = line->l_len;
+	if (len == 0)
+		return;
+
+	c = line->l_line;
+	found = 0;
+	/* Final character in buffer. */
+	fin = c + len - 1;
+
+	/*
+	 * Keyword formats:
+	 * $Keyword$
+	 * $Keyword: value$
+	 */
+	for (; c < fin; c++) {
+		if (*c == '$') {
+			BUF *tmpbuf;
+			size_t clen, tlen;
+
+			/* remember start of this possible keyword */
+			start = c;
+
+			/* first following character has to be alphanumeric */
+			c++;
+			if (!isalpha(*c)) {
+				c = start;
+				continue;
+			}
+
+			/* Number of characters between c and fin, inclusive. */
+			clen = fin - c + 1;
+
+			/* look for any matching keywords */
+			found = 0;
+			for (j = 0; j < RCS_NKWORDS; j++) {
+				size_t kwlen;
+
+				kwlen = strlen(rcs_expkw[j].kw_str);
+				/*
+				 * kwlen must be less than clen since clen
+				 * includes either a terminating `$' or a `:'.
+				 */
+				if (kwlen < clen &&
+				    memcmp(c, rcs_expkw[j].kw_str, kwlen) == 0 &&
+				    (c[kwlen] == '$' || c[kwlen] == ':')) {
+					found = 1;
+					kwstr = rcs_expkw[j].kw_str;
+					kwtype = rcs_expkw[j].kw_type;
+					c += kwlen;
+					break;
+				}
+			}
+
+			/* unknown keyword, continue looking */
+			if (found == 0) {
+				c = start;
+				continue;
+			}
+
+			/*
+			 * if the next character was ':' we need to look for
+			 * an '$' before the end of the line to be sure it is
+			 * in fact a keyword.
+			 */
+			if (*c == ':') {
+				for (; c <= fin; ++c) {
+					if (*c == '$' || *c == '\n')
+						break;
+				}
+
+				if (*c != '$') {
+					c = start;
+					continue;
+				}
+			}
+			end = c + 1;
+
+			/* start constructing the expansion */
+			expbuf[0] = '\0';
+
+			if (mode & RCS_KWEXP_NAME) {
+				if (strlcat(expbuf, "$", sizeof(expbuf)) >= sizeof(expbuf) ||
+				    strlcat(expbuf, kwstr, sizeof(expbuf)) >= sizeof(expbuf))
+					fatal("rcs_expand_keywords: truncated");
+				if ((mode & RCS_KWEXP_VAL) &&
+				    strlcat(expbuf, ": ", sizeof(expbuf)) >= sizeof(expbuf))
+					fatal("rcs_expand_keywords: truncated");
+			}
+
+			/*
+			 * order matters because of RCS_KW_ID and
+			 * RCS_KW_HEADER here
+			 */
+			if (mode & RCS_KWEXP_VAL) {
+				if (kwtype & RCS_KW_RCSFILE) {
+					if (!(kwtype & RCS_KW_FULLPATH))
+						(void)strlcat(expbuf, basename(rcsfile), sizeof(expbuf));
+					else
+						(void)strlcat(expbuf, rcsfile, sizeof(expbuf));
+					if (strlcat(expbuf, " ", sizeof(expbuf)) >= sizeof(expbuf))
+						fatal("rcs_expand_keywords: truncated");
+				}
+
+				if (kwtype & RCS_KW_REVISION) {
+					rcsnum_tostr(rdp->rd_num, buf, sizeof(buf));
+					if (strlcat(buf, " ", sizeof(buf)) >= sizeof(buf) ||
+					    strlcat(expbuf, buf, sizeof(expbuf)) >= sizeof(buf))
+						fatal("rcs_expand_keywords: truncated");
+				}
+
+				if (kwtype & RCS_KW_DATE) {
+					fmt = "%Y/%m/%d %H:%M:%S ";
+
+					strftime(buf, sizeof(buf), fmt, &rdp->rd_date);
+					if (strlcat(expbuf, buf, sizeof(expbuf)) >= sizeof(expbuf))
+						fatal("rcs_expand_keywords: string truncated");
+				}
+
+				if (kwtype & RCS_KW_AUTHOR) {
+					if (strlcat(expbuf, rdp->rd_author, sizeof(expbuf)) >= sizeof(expbuf) ||
+					    strlcat(expbuf, " ", sizeof(expbuf)) >= sizeof(expbuf))
+						fatal("rcs_expand_keywords: string truncated");
+				}
+
+				if (kwtype & RCS_KW_STATE) {
+					if (strlcat(expbuf, rdp->rd_state, sizeof(expbuf)) >= sizeof(expbuf) ||
+					    strlcat(expbuf, " ", sizeof(expbuf)) >= sizeof(expbuf))
+						fatal("rcs_expand_keywords: string truncated");
+				}
+
+				/* order does not matter anymore below */
+				if (kwtype & RCS_KW_LOG)
+					if (strlcat(expbuf, " ", sizeof(expbuf)) >= sizeof(expbuf))
+						fatal("rcs_expand_keywords: string truncated");
+
+				if (kwtype & RCS_KW_SOURCE) {
+					if (strlcat(expbuf, rcsfile, sizeof(expbuf)) >= sizeof(expbuf) ||
+					    strlcat(expbuf, " ", sizeof(expbuf)) >= sizeof(expbuf))
+						fatal("rcs_expand_keywords: string truncated");
+				}
+
+				if (kwtype & RCS_KW_NAME)
+					if (strlcat(expbuf, " ", sizeof(expbuf)) >= sizeof(expbuf))
+						fatal("rcs_expand_keywords: string truncated");
+			}
+
+			/* end the expansion */
+			if (mode & RCS_KWEXP_NAME)
+				if (strlcat(expbuf, "$",
+				    sizeof(expbuf)) >= sizeof(expbuf))
+					fatal("rcs_expand_keywords: truncated");
+
+			/* Concatenate everything together. */
+			tmpbuf = cvs_buf_alloc(len + strlen(expbuf), BUF_AUTOEXT);
+			/* Append everything before keyword. */
+			cvs_buf_append(tmpbuf, line->l_line,
+			    start - (unsigned char *)line->l_line);
+			/* Append keyword. */
+			cvs_buf_append(tmpbuf, expbuf, strlen(expbuf));
+			/* Point c to end of keyword. */
+			tlen = cvs_buf_len(tmpbuf) - 1;
+			/* Append everything after keyword. */
+			cvs_buf_append(tmpbuf, end,
+			    ((unsigned char *)line->l_line + line->l_len) - end);
+			c = cvs_buf_get(tmpbuf) + tlen;
+			/* Point fin to end of data. */
+			fin = cvs_buf_get(tmpbuf) + cvs_buf_len(tmpbuf) - 1;
+			/* Recalculate new length. */
+			len = cvs_buf_len(tmpbuf);
+
+			/* tmpbuf is now ready, convert to string */
+			line->l_len = len;
+			line->l_line = cvs_buf_release(tmpbuf);
+		}
+	}
+}
+
+/*
+ * rcs_kwexp_lines()
+ *
+ * Do keyword expansion of cvs_lines struct, if necessary.
+ * Any lines which need expansion are allocated memory in a separate malloc()
+ * from the original, and l_needsfree is set to 1.  cvs_freelines() will check
+ * for this and free if necessary.  This basically gives us 'copy-on-write'
+ * semantics for expansion of keywords, so we do the minimum work required.
+ *
+ * On error, return NULL.
+ */
+void
+rcs_kwexp_lines(char *rcsfile, struct rcs_delta *rdp, struct cvs_lines *lines,
+    int mode)
+{
+	struct cvs_line *lp;
+	TAILQ_FOREACH(lp, &lines->l_lines, l_list)
+		rcs_kwexp_line(rcsfile, rdp, lp, mode);
+}
-- 
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