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/*
Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include "changelog-mem-types.h"
#include "gf-changelog-helpers.h"
ssize_t gf_changelog_read_path (int fd, char *buffer, size_t bufsize)
{
return read (fd, buffer, bufsize);
}
size_t
gf_changelog_write (int fd, char *buffer, size_t len)
{
ssize_t size = 0;
size_t writen = 0;
while (writen < len) {
size = write (fd,
buffer + writen, len - writen);
if (size <= 0)
break;
writen += size;
}
return writen;
}
void
gf_rfc3986_encode (unsigned char *s, char *enc, char *estr)
{
for (; *s; s++) {
if (estr[*s])
sprintf(enc, "%c", estr[*s]);
else
sprintf(enc, "%%%02X", *s);
while (*++enc);
}
}
/**
* thread safe version of readline with buffering
* (taken from Unix Network Programming Volume I, W.R. Stevens)
*
* This is favoured over fgets() as we'd need to ftruncate()
* (see gf_changelog_scan() API) to record new changelog files.
* stream open functions does have a truncate like api (although
* that can be done via @fflush(fp), @ftruncate(fd) and @fseek(fp),
* but this involves mixing POSIX file descriptors and stream FILE *).
*
* NOTE: This implmentation still does work with more than one fd's
* used to perform gf_readline(). For this very reason it's not
* made a part of libglusterfs.
*/
static pthread_key_t rl_key;
static pthread_once_t rl_once = PTHREAD_ONCE_INIT;
static void
readline_destructor (void *ptr)
{
GF_FREE (ptr);
}
static void
readline_once (void)
{
pthread_key_create (&rl_key, readline_destructor);
}
static ssize_t
my_read (read_line_t *tsd, int fd, char *ptr)
{
if (tsd->rl_cnt <= 0) {
if ( (tsd->rl_cnt = read (fd, tsd->rl_buf, MAXLINE)) < 0 )
return -1;
else if (tsd->rl_cnt == 0)
return 0;
tsd->rl_bufptr = tsd->rl_buf;
}
tsd->rl_cnt--;
*ptr = *tsd->rl_bufptr++;
return 1;
}
static int
gf_readline_init_once (read_line_t **tsd)
{
if (pthread_once (&rl_once, readline_once) != 0)
return -1;
*tsd = pthread_getspecific (rl_key);
if (*tsd)
goto out;
*tsd = GF_CALLOC (1, sizeof (**tsd),
gf_changelog_mt_libgfchangelog_rl_t);
if (!*tsd)
return -1;
if (pthread_setspecific (rl_key, *tsd) != 0)
return -1;
out:
return 0;
}
ssize_t
gf_readline (int fd, void *vptr, size_t maxlen)
{
size_t n = 0;
size_t rc = 0;
char c = ' ';
char *ptr = NULL;
read_line_t *tsd = NULL;
if (gf_readline_init_once (&tsd))
return -1;
ptr = vptr;
for (n = 1; n < maxlen; n++) {
if ( (rc = my_read (tsd, fd, &c)) == 1 ) {
*ptr++ = c;
if (c == '\n')
break;
} else if (rc == 0) {
*ptr = '\0';
return (n - 1);
} else
return -1;
}
*ptr = '\0';
return n;
}
off_t
gf_lseek (int fd, off_t offset, int whence)
{
off_t off = 0;
read_line_t *tsd = NULL;
if (gf_readline_init_once (&tsd))
return -1;
if ( (off = lseek (fd, offset, whence)) == -1)
return -1;
tsd->rl_cnt = 0;
tsd->rl_bufptr = tsd->rl_buf;
return off;
}
int
gf_ftruncate (int fd, off_t length)
{
read_line_t *tsd = NULL;
if (gf_readline_init_once (&tsd))
return -1;
if (ftruncate (fd, 0))
return -1;
tsd->rl_cnt = 0;
tsd->rl_bufptr = tsd->rl_buf;
return 0;
}
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