File: [local] / src / usr.bin / cvs / buf.c (download)
Revision 1.76, Fri Jul 23 21:46:05 2010 UTC (13 years, 10 months ago) by ray
Branch: MAIN
Changes since 1.75: +31 -30 lines
Reduce variable/function name and whitespace differences between
cvs/rcs.
OK xsa zinovik
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/* $OpenBSD: buf.c,v 1.76 2010/07/23 21:46:05 ray Exp $ */
/*
* Copyright (c) 2003 Jean-Francois Brousseau <jfb@openbsd.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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``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 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.
*/
#include <sys/stat.h>
#include <sys/time.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "atomicio.h"
#include "cvs.h"
#include "buf.h"
#define BUF_INCR 128
#define BUF_GROW(bp, len) \
do { \
b->cb_buf = xrealloc(b->cb_buf, 1, b->cb_size + len); \
b->cb_size += len; \
} while (0);
struct buf {
u_char *cb_buf;
size_t cb_size;
size_t cb_len;
};
BUF *
buf_alloc(size_t len)
{
BUF *b;
b = xmalloc(sizeof(*b));
/* Postpone creation of zero-sized buffers */
if (len > 0)
b->cb_buf = xcalloc(1, len);
else
b->cb_buf = NULL;
b->cb_size = len;
b->cb_len = 0;
return (b);
}
BUF *
buf_load(const char *path)
{
int fd;
BUF *bp;
if ((fd = open(path, O_RDONLY, 0600)) == -1)
fatal("buf_load: failed to load '%s' : %s", path,
strerror(errno));
bp = buf_load_fd(fd);
(void)close(fd);
return (bp);
}
BUF *
buf_load_fd(int fd)
{
struct stat st;
BUF *buf;
if (fstat(fd, &st) == -1)
fatal("buf_load_fd: fstat: %s", strerror(errno));
if (lseek(fd, 0, SEEK_SET) == -1)
fatal("buf_load_fd: lseek: %s", strerror(errno));
if (st.st_size > SIZE_MAX)
fatal("buf_load_fd: file size too big");
buf = buf_alloc(st.st_size);
if (atomicio(read, fd, buf->cb_buf, buf->cb_size) != buf->cb_size)
fatal("buf_load_fd: read: %s", strerror(errno));
buf->cb_len = buf->cb_size;
return (buf);
}
void
buf_free(BUF *b)
{
if (b->cb_buf != NULL)
xfree(b->cb_buf);
xfree(b);
}
u_char *
buf_release(BUF *b)
{
u_char *tmp;
tmp = b->cb_buf;
xfree(b);
return (tmp);
}
void
buf_putc(BUF *b, int c)
{
u_char *bp;
bp = b->cb_buf + b->cb_len;
if (bp == (b->cb_buf + b->cb_size)) {
BUF_GROW(b, BUF_INCR);
bp = b->cb_buf + b->cb_len;
}
*bp = (u_char)c;
b->cb_len++;
}
void
buf_puts(BUF *b, const char *str)
{
buf_append(b, str, strlen(str));
}
void
buf_append(BUF *b, const void *data, size_t len)
{
size_t left;
u_char *bp, *bep;
bp = b->cb_buf + b->cb_len;
bep = b->cb_buf + b->cb_size;
left = bep - bp;
if (left < len) {
BUF_GROW(b, len - left);
bp = b->cb_buf + b->cb_len;
}
memcpy(bp, data, len);
b->cb_len += len;
}
size_t
buf_len(BUF *b)
{
return (b->cb_len);
}
int
buf_write_fd(BUF *b, int fd)
{
if (atomicio(vwrite, fd, b->cb_buf, b->cb_len) != b->cb_len)
return (-1);
return (0);
}
int
buf_write(BUF *b, const char *path, mode_t mode)
{
int fd;
open:
if ((fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)) == -1) {
if (errno == EACCES && unlink(path) != -1)
goto open;
else
fatal("open: `%s': %s", path, strerror(errno));
}
if (buf_write_fd(b, fd) == -1) {
(void)unlink(path);
fatal("buf_write: buf_write_fd: `%s'", path);
}
if (fchmod(fd, mode) < 0)
cvs_log(LP_ERR, "permissions not set on file %s", path);
(void)close(fd);
return (0);
}
int
buf_write_stmp(BUF *b, char *template, struct timeval *tv)
{
int fd;
if ((fd = mkstemp(template)) == -1)
fatal("mkstemp: `%s': %s", template, strerror(errno));
if (buf_write_fd(b, fd) == -1) {
(void)unlink(template);
fatal("buf_write_stmp: buf_write_fd: `%s'", template);
}
if (tv != NULL) {
if (futimes(fd, tv) == -1)
fatal("buf_write_stmp: futimes failed");
}
worklist_add(template, &temp_files);
if (lseek(fd, 0, SEEK_SET) < 0)
fatal("buf_write_stmp: lseek: %s", strerror(errno));
return (fd);
}
u_char *
buf_get(BUF *bp)
{
return (bp->cb_buf);
}
int
buf_differ(const BUF *b1, const BUF *b2)
{
if (b1->cb_len != b2->cb_len)
return (1);
return (memcmp(b1->cb_buf, b2->cb_buf, b1->cb_len));
}