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