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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.

/*	$OpenBSD: diff.c,v 1.112 2007/01/12 23:32:01 niallo Exp $	*/
/*
 * Copyright (c) 2006 Joris Vink <joris@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 "includes.h"

#include "cvs.h"
#include "diff.h"
#include "log.h"
#include "remote.h"

void	cvs_diff_local(struct cvs_file *);

static int Nflag = 0;
static char *rev1 = NULL;
static char *rev2 = NULL;

struct cvs_cmd cvs_cmd_diff = {
	CVS_OP_DIFF, 0, "diff",
	{ "di", "dif" },
	"Show differences between revisions",
	"[-cilNnpu] [[-D date] [-r rev] [-D date2 | -r rev2]] "
	"[-k mode] [file ...]",
	"cD:iklNnpr:Ru",
	NULL,
	cvs_diff
};

int
cvs_diff(int argc, char **argv)
{
	int ch;
	char *arg = ".";
	int flags;
	struct cvs_recursion cr;

	flags = CR_RECURSE_DIRS;
	strlcpy(diffargs, argv[0], sizeof(diffargs));

	while ((ch = getopt(argc, argv, cvs_cmd_diff.cmd_opts)) != -1) {
		switch (ch) {
		case 'c':
			strlcat(diffargs, " -c", sizeof(diffargs));
			diff_format = D_CONTEXT;
			break;
		case 'l':
			flags &= ~CR_RECURSE_DIRS;
			break;
		case 'n':
			strlcat(diffargs, " -n", sizeof(diffargs));
			diff_format = D_RCSDIFF;
			break;
		case 'N':
			strlcat(diffargs, " -N", sizeof(diffargs));
			Nflag = 1;
			break;
		case 'p':
			strlcat(diffargs, " -p", sizeof(diffargs));
			diff_pflag = 1;
			break;
		case 'r':
			if (rev1 == NULL) {
				rev1 = optarg;
			} else if (rev2 == NULL) {
				rev2 = optarg;
			} else {
				fatal("no more than 2 revisions/dates can"
				    " be specified");
			}
			break;
		case 'u':
			strlcat(diffargs, " -u", sizeof(diffargs));
			diff_format = D_UNIFIED;
			break;
		default:
			fatal("%s", cvs_cmd_diff.cmd_synopsis);
		}
	}

	argc -= optind;
	argv += optind;

	cr.enterdir = NULL;
	cr.leavedir = NULL;

	if (current_cvsroot->cr_method != CVS_METHOD_LOCAL) {
		cvs_client_connect_to_server();
		cr.fileproc = cvs_client_sendfile;

		if (!(flags & CR_RECURSE_DIRS))
			cvs_client_send_request("Argument -l");

		switch (diff_format) {
		case D_CONTEXT:
			cvs_client_send_request("Argument -c");
			break;
		case D_RCSDIFF:
			cvs_client_send_request("Argument -n");
			break;
		case D_UNIFIED:
			cvs_client_send_request("Argument -u");
			break;
		default:
			break;
		}

		if (Nflag == 1)
			cvs_client_send_request("Argument -N");

		if (diff_pflag == 1)
			cvs_client_send_request("Argument -p");

		if (rev1 != NULL)
			cvs_client_send_request("Argument -r%s", rev1);
		if (rev2 != NULL)
			cvs_client_send_request("Argument -r%s", rev2);
	} else {
		cr.fileproc = cvs_diff_local;
	}

	cr.flags = flags;

	diff_rev1 = diff_rev2 = NULL;

	if (argc > 0)
		cvs_file_run(argc, argv, &cr);
	else
		cvs_file_run(1, &arg, &cr);

	if (current_cvsroot->cr_method != CVS_METHOD_LOCAL) {
		cvs_client_send_files(argv, argc);
		cvs_client_senddir(".");
		cvs_client_send_request("diff");
		cvs_client_get_responses();
	}

	return (0);
}

void
cvs_diff_local(struct cvs_file *cf)
{
	RCSNUM *r1;
	BUF *b1, *b2;
	struct stat st;
	struct timeval tv[2], tv2[2];
	char rbuf[16], *p1, *p2;

	r1 = NULL;
	b1 = b2 = NULL;

	cvs_log(LP_TRACE, "cvs_diff_local(%s)", cf->file_path);

	if (cf->file_type == CVS_DIR) {
		if (verbosity > 1)
			cvs_log(LP_NOTICE, "Diffing inside %s", cf->file_path);
		return;
	}

	cvs_file_classify(cf, NULL, 0);

	if (cf->file_status == FILE_LOST) {
		cvs_log(LP_ERR, "cannot find file %s", cf->file_path);
		return;
	} else if (cf->file_status == FILE_UNKNOWN) {
		cvs_log(LP_ERR, "I know nothing about %s", cf->file_path);
		return;
	} else if (cf->file_status == FILE_ADDED && Nflag == 0) {
		cvs_log(LP_ERR, "%s is a new entry, no comparison available",
		    cf->file_path);
		return;
	} else if (cf->file_status == FILE_REMOVED && Nflag == 0) {
		cvs_log(LP_ERR, "%s was removed, no comparison available",
		    cf->file_path);
		return;
	} else if (cf->file_status == FILE_UPTODATE && rev1 == NULL &&
	     rev2 == NULL) {
		return;
	}

	if (rev1 != NULL)
		diff_rev1 = rcs_translate_tag(rev1, cf->file_rcs);
	if (rev2 != NULL)
		diff_rev2 = rcs_translate_tag(rev2, cf->file_rcs);

	diff_file = cf->file_path;
	cvs_printf("Index: %s\n%s\nRCS file: %s\n", cf->file_path,
	    RCS_DIFF_DIV, cf->file_rpath);

	if (cf->file_status != FILE_ADDED) {
		if (diff_rev1 != NULL)
			r1 = diff_rev1;
		else
			r1 = cf->file_ent->ce_rev;

		diff_rev1 = r1;
		rcsnum_tostr(r1, rbuf , sizeof(rbuf));
		cvs_printf("retrieving revision %s\n", rbuf);
		if ((b1 = rcs_rev_getbuf(cf->file_rcs, r1)) == NULL)
			fatal("failed to retrieve revision %s", rbuf);

		b1 = rcs_kwexp_buf(b1, cf->file_rcs, r1);

		tv[0].tv_sec = rcs_rev_getdate(cf->file_rcs, r1);
		tv[0].tv_usec = 0;
		tv[1] = tv[0];
	}

	if (diff_rev2 != NULL && cf->file_status != FILE_ADDED &&
	    cf->file_status != FILE_REMOVED) {
		rcsnum_tostr(diff_rev2, rbuf, sizeof(rbuf));
		cvs_printf("retrieving revision %s\n", rbuf);
		if ((b2 = rcs_rev_getbuf(cf->file_rcs, diff_rev2)) == NULL)
			fatal("failed to retrieve revision %s", rbuf);

		b2 = rcs_kwexp_buf(b2, cf->file_rcs, diff_rev2);

		tv2[0].tv_sec = rcs_rev_getdate(cf->file_rcs, diff_rev2);
		tv2[0].tv_usec = 0;
		tv2[1] = tv2[0];
	} else if (cf->file_status != FILE_REMOVED) {
		if (fstat(cf->fd, &st) == -1)
			fatal("fstat failed %s", strerror(errno));
		if ((b2 = cvs_buf_load_fd(cf->fd, BUF_AUTOEXT)) == NULL)
			fatal("failed to load %s", cf->file_path);

		st.st_mtime = cvs_hack_time(st.st_mtime, 1);
		tv2[0].tv_sec = st.st_mtime;
		tv2[0].tv_usec = 0;
		tv2[1] = tv2[0];
	}

	cvs_printf("%s", diffargs);

	if (cf->file_status != FILE_ADDED) {
		rcsnum_tostr(r1, rbuf, sizeof(rbuf));
		cvs_printf(" -r%s", rbuf);

		if (diff_rev2 != NULL) {
			rcsnum_tostr(diff_rev2, rbuf, sizeof(rbuf));
			cvs_printf(" -r%s", rbuf);
		}
	}

	cvs_printf(" %s\n", cf->file_path);

	if (cf->file_status != FILE_ADDED) {
		(void)xasprintf(&p1, "%s/diff1.XXXXXXXXXX", cvs_tmpdir);
		cvs_buf_write_stmp(b1, p1, tv);
		cvs_buf_free(b1);
	} else
		(void)xasprintf(&p1, "%s", CVS_PATH_DEVNULL);

	if (cf->file_status != FILE_REMOVED) {
		(void)xasprintf(&p2, "%s/diff2.XXXXXXXXXX", cvs_tmpdir);
		cvs_buf_write_stmp(b2, p2, tv2);
		cvs_buf_free(b2);
	} else
		(void)xasprintf(&p2, "%s", CVS_PATH_DEVNULL);

	if (cvs_diffreg(p1, p2, NULL) == D_ERROR)
		fatal("cvs_diff_local: failed to get RCS patch");

	cvs_worklist_run(&temp_files, cvs_worklist_unlink);

	if (p1 != NULL)
		xfree(p1);
	if (p2 != NULL)
		xfree(p2);

	if (diff_rev1 != NULL && diff_rev1 != cf->file_ent->ce_rev)
		rcsnum_free(diff_rev1);
	if (diff_rev2 != NULL && diff_rev2 != cf->file_rcsrev)
		rcsnum_free(diff_rev2);

	diff_rev1 = diff_rev2 = NULL;
}