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/*-
* Copyright (c) 2003-2006, Maxime Henrion <mux@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "diff.h"
#include "keyword.h"
#include "misc.h"
#include "stream.h"
typedef long lineno_t;
#define EC_ADD 0
#define EC_DEL 1
/* Editing command and state. */
struct editcmd {
int cmd;
lineno_t where;
lineno_t count;
lineno_t lasta;
lineno_t lastd;
lineno_t editline;
/* For convenience. */
struct keyword *keyword;
struct diffinfo *di;
struct stream *orig;
struct stream *dest;
};
static int diff_geteditcmd(struct editcmd *, char *);
static int diff_copyln(struct editcmd *, lineno_t);
static void diff_write(struct editcmd *, void *, size_t);
int
diff_apply(struct stream *rd, struct stream *orig, struct stream *dest,
struct keyword *keyword, struct diffinfo *di)
{
struct editcmd ec;
lineno_t i;
char *line;
size_t size;
int empty, error, noeol;
memset(&ec, 0, sizeof(ec));
empty = 0;
noeol = 0;
ec.di = di;
ec.keyword = keyword;
ec.orig = orig;
ec.dest = dest;
line = stream_getln(rd, NULL);
while (line != NULL && strcmp(line, ".") != 0 &&
strcmp(line, ".+") != 0) {
/*
* The server sends an empty line and then terminates
* with .+ for forced (and thus empty) commits.
*/
if (*line == '\0') {
if (empty)
return (-1);
empty = 1;
line = stream_getln(rd, NULL);
continue;
}
error = diff_geteditcmd(&ec, line);
if (error)
return (-1);
if (ec.cmd == EC_ADD) {
error = diff_copyln(&ec, ec.where);
if (error)
return (-1);
for (i = 0; i < ec.count; i++) {
line = stream_getln(rd, &size);
if (line == NULL)
return (-1);
if (line[0] == '.') {
line++;
size--;
}
diff_write(&ec, line, size);
}
} else {
assert(ec.cmd == EC_DEL);
error = diff_copyln(&ec, ec.where - 1);
if (error)
return (-1);
for (i = 0; i < ec.count; i++) {
line = stream_getln(orig, NULL);
if (line == NULL)
return (-1);
ec.editline++;
}
}
line = stream_getln(rd, NULL);
}
if (line == NULL)
return (-1);
/* If we got ".+", there's no ending newline. */
if (strcmp(line, ".+") == 0 && !empty)
noeol = 1;
ec.where = 0;
while ((line = stream_getln(orig, &size)) != NULL)
diff_write(&ec, line, size);
stream_flush(dest);
if (noeol) {
error = stream_truncate_rel(dest, -1);
if (error) {
warn("stream_truncate_rel");
return (-1);
}
}
return (0);
}
/* Get an editing command from the diff. */
static int
diff_geteditcmd(struct editcmd *ec, char *line)
{
char *end;
if (line[0] == 'a')
ec->cmd = EC_ADD;
else if (line[0] == 'd')
ec->cmd = EC_DEL;
else
return (-1);
errno = 0;
ec->where = strtol(line + 1, &end, 10);
if (errno || ec->where < 0 || *end != ' ')
return (-1);
line = end + 1;
errno = 0;
ec->count = strtol(line, &end, 10);
if (errno || ec->count <= 0 || *end != '\0')
return (-1);
if (ec->cmd == EC_ADD) {
if (ec->where < ec->lasta)
return (-1);
ec->lasta = ec->where + 1;
} else {
if (ec->where < ec->lasta || ec->where < ec->lastd)
return (-1);
ec->lasta = ec->where;
ec->lastd = ec->where + ec->count;
}
return (0);
}
/* Copy lines from the original version of the file up to line "to". */
static int
diff_copyln(struct editcmd *ec, lineno_t to)
{
char *line;
size_t size;
while (ec->editline < to) {
line = stream_getln(ec->orig, &size);
if (line == NULL)
return (-1);
ec->editline++;
diff_write(ec, line, size);
}
return (0);
}
/* Write a new line to the file, expanding RCS keywords appropriately. */
static void
diff_write(struct editcmd *ec, void *buf, size_t size)
{
char *line, *newline;
size_t newsize;
int ret;
line = buf;
ret = keyword_expand(ec->keyword, ec->di, line, size,
&newline, &newsize);
if (ret) {
stream_write(ec->dest, newline, newsize);
free(newline);
} else {
stream_write(ec->dest, buf, size);
}
}
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