/
streams.c
executable file
·2953 lines (2437 loc) · 75.8 KB
/
streams.c
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/*
+----------------------------------------------------------------------+
| PHP Version 4 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2003 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.02 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.php.net/license/2_02.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: |
| Wez Furlong (wez@thebrainroom.com) |
| Borrowed code from: |
| Rasmus Lerdorf <rasmus@lerdorf.on.ca> |
| Jim Winstead <jimw@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#define _GNU_SOURCE
#include "php.h"
#include "php_globals.h"
#include "php_network.h"
#include "php_open_temporary_file.h"
#include "ext/standard/file.h"
#include "ext/standard/basic_functions.h" /* for BG(mmap_file) (not strictly required) */
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#if HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <stddef.h>
#include <fcntl.h>
#ifndef MAP_FAILED
#define MAP_FAILED ((void *) -1)
#endif
#define CHUNK_SIZE 8192
#ifdef PHP_WIN32
#define EWOULDBLOCK WSAEWOULDBLOCK
#endif
#define STREAM_DEBUG 0
#define STREAM_WRAPPER_PLAIN_FILES ((php_stream_wrapper*)-1)
#define PHP_STDIOP_GET_FD(anfd, data) anfd = (data)->file ? fileno((data)->file) : (data)->fd
static php_stream_wrapper php_plain_files_wrapper;
/* {{{ some macros to help track leaks */
#if ZEND_DEBUG
#if USE_ZEND_ALLOC
#define emalloc_rel_orig(size) \
( __php_stream_call_depth == 0 \
? _emalloc((size) ZEND_FILE_LINE_CC ZEND_FILE_LINE_RELAY_CC) \
: _emalloc((size) ZEND_FILE_LINE_CC ZEND_FILE_LINE_ORIG_RELAY_CC) )
#define erealloc_rel_orig(ptr, size) \
( __php_stream_call_depth == 0 \
? _erealloc((ptr), (size), 0 ZEND_FILE_LINE_CC ZEND_FILE_LINE_RELAY_CC) \
: _erealloc((ptr), (size), 0 ZEND_FILE_LINE_CC ZEND_FILE_LINE_ORIG_RELAY_CC) )
#else
#define emalloc_rel_orig(size) emalloc(size)
#define erealloc_rel_orig(ptr, size) erealloc(ptr, size)
#endif
#define pemalloc_rel_orig(size, persistent) ((persistent) ? malloc((size)) : emalloc_rel_orig((size)))
#define perealloc_rel_orig(ptr, size, persistent) ((persistent) ? realloc((ptr), (size)) : erealloc_rel_orig((ptr), (size)))
#else
# define pemalloc_rel_orig(size, persistent) pemalloc((size), (persistent))
# define perealloc_rel_orig(ptr, size, persistent) perealloc((ptr), (size), (persistent))
# define emalloc_rel_orig(size) emalloc((size))
#endif
/* }}} */
/* Under BSD, emulate fopencookie using funopen */
#if HAVE_FUNOPEN
typedef struct {
int (*reader)(void *, char *, int);
int (*writer)(void *, const char *, int);
fpos_t (*seeker)(void *, fpos_t, int);
int (*closer)(void *);
} COOKIE_IO_FUNCTIONS_T;
FILE *fopencookie(void *cookie, const char *mode, COOKIE_IO_FUNCTIONS_T *funcs)
{
return funopen(cookie, funcs->reader, funcs->writer, funcs->seeker, funcs->closer);
}
# define HAVE_FOPENCOOKIE 1
# define PHP_STREAM_COOKIE_FUNCTIONS &stream_cookie_functions
#elif HAVE_FOPENCOOKIE
# define PHP_STREAM_COOKIE_FUNCTIONS stream_cookie_functions
#endif
/* Global wrapper hash, copied to FG(stream_wrappers) on registration of volatile wrapper */
static HashTable url_stream_wrappers_hash;
static int le_stream = FAILURE; /* true global */
static int le_pstream = FAILURE; /* true global */
PHPAPI int php_file_le_stream(void)
{
return le_stream;
}
PHPAPI int php_file_le_pstream(void)
{
return le_pstream;
}
static int _php_stream_release_context(list_entry *le, void *pContext TSRMLS_DC)
{
if (le->ptr == pContext) {
return --le->refcount == 0;
}
return 0;
}
static int forget_persistent_resource_id_numbers(zend_rsrc_list_entry *rsrc TSRMLS_DC)
{
php_stream *stream;
if (Z_TYPE_P(rsrc) != le_pstream)
return 0;
stream = (php_stream*)rsrc->ptr;
#if STREAM_DEBUG
fprintf(stderr, "forget_persistent: %s:%p\n", stream->ops->label, stream);
#endif
stream->rsrc_id = FAILURE;
if (stream->context) {
zend_hash_apply_with_argument(&EG(regular_list),
(apply_func_arg_t) _php_stream_release_context,
stream->context TSRMLS_CC);
stream->context = NULL;
}
return 0;
}
PHP_RSHUTDOWN_FUNCTION(streams)
{
zend_hash_apply(&EG(persistent_list), (apply_func_t)forget_persistent_resource_id_numbers TSRMLS_CC);
return SUCCESS;
}
PHPAPI int php_stream_from_persistent_id(const char *persistent_id, php_stream **stream TSRMLS_DC)
{
zend_rsrc_list_entry *le;
if (zend_hash_find(&EG(persistent_list), (char*)persistent_id, strlen(persistent_id)+1, (void*) &le) == SUCCESS) {
if (Z_TYPE_P(le) == le_pstream) {
if (stream) {
*stream = (php_stream*)le->ptr;
le->refcount++;
(*stream)->rsrc_id = ZEND_REGISTER_RESOURCE(NULL, *stream, le_pstream);
}
return PHP_STREAM_PERSISTENT_SUCCESS;
}
return PHP_STREAM_PERSISTENT_FAILURE;
}
return PHP_STREAM_PERSISTENT_NOT_EXIST;
}
static void display_wrapper_errors(php_stream_wrapper *wrapper, const char *path, const char *caption TSRMLS_DC)
{
char *tmp = estrdup(path);
char *msg;
int free_msg = 0;
if (wrapper) {
if (wrapper->err_count > 0) {
int i;
size_t l;
int brlen;
char *br;
if (PG(html_errors)) {
brlen = 7;
br = "<br />\n";
} else {
brlen = 1;
br = "\n";
}
for (i = 0, l = 0; i < wrapper->err_count; i++) {
l += strlen(wrapper->err_stack[i]);
if (i < wrapper->err_count - 1)
l += brlen;
}
msg = emalloc(l + 1);
msg[0] = '\0';
for (i = 0; i < wrapper->err_count; i++) {
strcat(msg, wrapper->err_stack[i]);
if (i < wrapper->err_count - 1)
strcat(msg, br);
}
free_msg = 1;
} else {
msg = strerror(errno);
}
} else {
msg = "no suitable wrapper could be found";
}
php_strip_url_passwd(tmp);
php_error_docref1(NULL TSRMLS_CC, tmp, E_WARNING, "%s: %s", caption, msg);
efree(tmp);
if (free_msg)
efree(msg);
}
static void tidy_wrapper_error_log(php_stream_wrapper *wrapper TSRMLS_DC)
{
if (wrapper) {
/* tidy up the error stack */
int i;
for (i = 0; i < wrapper->err_count; i++)
efree(wrapper->err_stack[i]);
if (wrapper->err_stack)
efree(wrapper->err_stack);
wrapper->err_stack = NULL;
wrapper->err_count = 0;
}
}
/* allocate a new stream for a particular ops */
PHPAPI php_stream *_php_stream_alloc(php_stream_ops *ops, void *abstract, const char *persistent_id, const char *mode STREAMS_DC TSRMLS_DC) /* {{{ */
{
php_stream *ret;
ret = (php_stream*) pemalloc_rel_orig(sizeof(php_stream), persistent_id ? 1 : 0);
memset(ret, 0, sizeof(php_stream));
#if STREAM_DEBUG
fprintf(stderr, "stream_alloc: %s:%p persistent=%s\n", ops->label, ret, persistent_id);
#endif
ret->ops = ops;
ret->abstract = abstract;
ret->is_persistent = persistent_id ? 1 : 0;
ret->chunk_size = FG(def_chunk_size);
if (FG(auto_detect_line_endings))
ret->flags |= PHP_STREAM_FLAG_DETECT_EOL;
if (persistent_id) {
zend_rsrc_list_entry le;
Z_TYPE(le) = le_pstream;
le.ptr = ret;
le.refcount = 0;
if (FAILURE == zend_hash_update(&EG(persistent_list), (char *)persistent_id,
strlen(persistent_id) + 1,
(void *)&le, sizeof(le), NULL)) {
pefree(ret, 1);
return NULL;
}
}
ret->rsrc_id = ZEND_REGISTER_RESOURCE(NULL, ret, persistent_id ? le_pstream : le_stream);
strlcpy(ret->mode, mode, sizeof(ret->mode));
return ret;
}
/* }}} */
static int _php_stream_free_persistent(list_entry *le, void *pStream TSRMLS_DC)
{
return le->ptr == pStream;
}
PHPAPI int _php_stream_free(php_stream *stream, int close_options TSRMLS_DC) /* {{{ */
{
int ret = 1;
int remove_rsrc = 1;
int preserve_handle = close_options & PHP_STREAM_FREE_PRESERVE_HANDLE ? 1 : 0;
int release_cast = 1;
#if STREAM_DEBUG
fprintf(stderr, "stream_free: %s:%p[%s] in_free=%d opts=%08x\n", stream->ops->label, stream, stream->__orig_path, stream->in_free, close_options);
#endif
/* recursion protection */
if (stream->in_free)
return 1;
stream->in_free++;
/* if we are releasing the stream only (and preserving the underlying handle),
* we need to do things a little differently.
* We are only ever called like this when the stream is cast to a FILE*
* for include (or other similar) purposes.
* */
if (preserve_handle) {
if (stream->fclose_stdiocast == PHP_STREAM_FCLOSE_FOPENCOOKIE) {
/* If the stream was fopencookied, we must NOT touch anything
* here, as the cookied stream relies on it all.
* Instead, mark the stream as OK to auto-clean */
php_stream_auto_cleanup(stream);
stream->in_free--;
return 0;
}
/* otherwise, make sure that we don't close the FILE* from a cast */
release_cast = 0;
}
#if STREAM_DEBUG
fprintf(stderr, "stream_free: %s:%p[%s] preserve_handle=%d release_cast=%d remove_rsrc=%d\n",
stream->ops->label, stream, stream->__orig_path, preserve_handle, release_cast, remove_rsrc);
#endif
/* make sure everything is saved */
_php_stream_flush(stream, 1 TSRMLS_CC);
/* If not called from the resource dtor, remove the stream
* from the resource list.
* */
if ((close_options & PHP_STREAM_FREE_RSRC_DTOR) == 0 && remove_rsrc) {
zend_list_delete(stream->rsrc_id);
}
if (close_options & PHP_STREAM_FREE_CALL_DTOR) {
if (release_cast && stream->fclose_stdiocast == PHP_STREAM_FCLOSE_FOPENCOOKIE) {
/* calling fclose on an fopencookied stream will ultimately
call this very same function. If we were called via fclose,
the cookie_closer unsets the fclose_stdiocast flags, so
we can be sure that we only reach here when PHP code calls
php_stream_free.
Lets let the cookie code clean it all up.
*/
stream->in_free = 0;
return fclose(stream->stdiocast);
}
ret = stream->ops->close(stream, preserve_handle ? 0 : 1 TSRMLS_CC);
stream->abstract = NULL;
/* tidy up any FILE* that might have been fdopened */
if (release_cast && stream->fclose_stdiocast == PHP_STREAM_FCLOSE_FDOPEN && stream->stdiocast) {
fclose(stream->stdiocast);
stream->stdiocast = NULL;
stream->fclose_stdiocast = PHP_STREAM_FCLOSE_NONE;
}
}
if (close_options & PHP_STREAM_FREE_RELEASE_STREAM) {
while (stream->filterhead) {
php_stream_filter_remove_head(stream, 1);
}
if (stream->wrapper && stream->wrapper->wops && stream->wrapper->wops->stream_closer) {
stream->wrapper->wops->stream_closer(stream->wrapper, stream TSRMLS_CC);
stream->wrapper = NULL;
}
if (stream->wrapperdata) {
zval_ptr_dtor(&stream->wrapperdata);
stream->wrapperdata = NULL;
}
if (stream->readbuf) {
pefree(stream->readbuf, stream->is_persistent);
stream->readbuf = NULL;
}
if (stream->is_persistent && (close_options & PHP_STREAM_FREE_PERSISTENT)) {
/* we don't work with *stream but need its value for comparison */
zend_hash_apply_with_argument(&EG(persistent_list), (apply_func_arg_t) _php_stream_free_persistent, stream TSRMLS_CC);
}
#if ZEND_DEBUG
if ((close_options & PHP_STREAM_FREE_RSRC_DTOR) && (stream->__exposed == 0) && (EG(error_reporting) & E_WARNING)) {
/* it leaked: Lets deliberately NOT pefree it so that the memory manager shows it
* as leaked; it will log a warning, but lets help it out and display what kind
* of stream it was. */
char leakbuf[512];
snprintf(leakbuf, sizeof(leakbuf), __FILE__ "(%d) : Stream of type '%s' 0x%08X (path:%s) was not closed\n", __LINE__, stream->ops->label, (unsigned int)stream, stream->__orig_path);
if (stream->__orig_path) {
pefree(stream->__orig_path, stream->is_persistent);
stream->__orig_path = NULL;
}
# if defined(PHP_WIN32)
OutputDebugString(leakbuf);
# else
fprintf(stderr, "%s", leakbuf);
# endif
} else {
if (stream->__orig_path) {
pefree(stream->__orig_path, stream->is_persistent);
stream->__orig_path = NULL;
}
pefree(stream, stream->is_persistent);
}
#else
pefree(stream, stream->is_persistent);
#endif
}
return ret;
}
/* }}} */
/* {{{ filter API */
static HashTable stream_filters_hash;
PHPAPI int php_stream_filter_register_factory(const char *filterpattern, php_stream_filter_factory *factory TSRMLS_DC)
{
return zend_hash_add(&stream_filters_hash, (char*)filterpattern, strlen(filterpattern), factory, sizeof(*factory), NULL);
}
PHPAPI int php_stream_filter_unregister_factory(const char *filterpattern TSRMLS_DC)
{
return zend_hash_del(&stream_filters_hash, (char*)filterpattern, strlen(filterpattern));
}
/* We allow very simple pattern matching for filter factories:
* if "charset.utf-8/sjis" is requested, we search first for an exact
* match. If that fails, we try "charset.*".
* This means that we don't need to clog up the hashtable with a zillion
* charsets (for example) but still be able to provide them all as filters */
PHPAPI php_stream_filter *php_stream_filter_create(const char *filtername, const char *filterparams, int filterparamslen, int persistent TSRMLS_DC)
{
php_stream_filter_factory *factory;
php_stream_filter *filter = NULL;
int n;
char *period;
n = strlen(filtername);
if (SUCCESS == zend_hash_find(&stream_filters_hash, (char*)filtername, n, (void**)&factory)) {
filter = factory->create_filter(filtername, filterparams, filterparamslen, persistent TSRMLS_CC);
} else if ((period = strchr(filtername, '.'))) {
/* try a wildcard */
char wildname[128];
PHP_STRLCPY(wildname, filtername, sizeof(wildname) - 1, period-filtername + 1);
strcat(wildname, "*");
if (SUCCESS == zend_hash_find(&stream_filters_hash, wildname, strlen(wildname), (void**)&factory)) {
filter = factory->create_filter(filtername, filterparams, filterparamslen, persistent TSRMLS_CC);
}
}
if (filter == NULL) {
/* TODO: these need correct docrefs */
if (factory == NULL)
php_error_docref(NULL TSRMLS_CC, E_WARNING, "unable to locate filter \"%s\"", filtername);
else
php_error_docref(NULL TSRMLS_CC, E_WARNING, "unable to create or locate filter \"%s\"", filtername);
}
return filter;
}
PHPAPI php_stream_filter *_php_stream_filter_alloc(php_stream_filter_ops *fops, void *abstract, int persistent STREAMS_DC TSRMLS_DC)
{
php_stream_filter *filter;
filter = (php_stream_filter*) pemalloc_rel_orig(sizeof(php_stream_filter), persistent);
memset(filter, 0, sizeof(php_stream_filter));
filter->fops = fops;
filter->abstract = abstract;
filter->is_persistent = persistent;
return filter;
}
PHPAPI void php_stream_filter_free(php_stream_filter *filter TSRMLS_DC)
{
if (filter->fops->dtor)
filter->fops->dtor(filter TSRMLS_CC);
pefree(filter, filter->is_persistent);
}
PHPAPI void php_stream_filter_prepend(php_stream *stream, php_stream_filter *filter)
{
filter->next = stream->filterhead;
filter->prev = NULL;
if (stream->filterhead) {
stream->filterhead->prev = filter;
} else {
stream->filtertail = filter;
}
stream->filterhead = filter;
filter->stream = stream;
}
PHPAPI void php_stream_filter_append(php_stream *stream, php_stream_filter *filter)
{
filter->prev = stream->filtertail;
filter->next = NULL;
if (stream->filtertail) {
stream->filtertail->next = filter;
} else {
stream->filterhead = filter;
}
stream->filtertail = filter;
filter->stream = stream;
}
PHPAPI php_stream_filter *php_stream_filter_remove(php_stream *stream, php_stream_filter *filter, int call_dtor TSRMLS_DC)
{
assert(stream == filter->stream);
if (filter->prev) {
filter->prev->next = filter->next;
} else {
stream->filterhead = filter->next;
}
if (filter->next) {
filter->next->prev = filter->prev;
} else {
stream->filtertail = filter->prev;
}
if (call_dtor) {
php_stream_filter_free(filter TSRMLS_CC);
return NULL;
}
return filter;
}
/* }}} */
/* {{{ generic stream operations */
static void php_stream_fill_read_buffer(php_stream *stream, size_t size TSRMLS_DC)
{
/* allocate/fill the buffer */
size_t justread = 0;
/* is there enough data in the buffer ? */
if (stream->writepos - stream->readpos < (off_t)size) {
/* ignore eof here; the underlying state might have changed */
/* no; so lets fetch more data */
/* reduce buffer memory consumption if possible, to avoid a realloc */
if (stream->readbuf && stream->readbuflen - stream->writepos < stream->chunk_size) {
memmove(stream->readbuf, stream->readbuf + stream->readpos, stream->readbuflen - stream->readpos);
stream->writepos -= stream->readpos;
stream->readpos = 0;
}
/* grow the buffer if required */
if (stream->readbuflen - stream->writepos < stream->chunk_size) {
stream->readbuflen += stream->chunk_size;
stream->readbuf = perealloc(stream->readbuf, stream->readbuflen,
stream->is_persistent);
}
if (stream->filterhead) {
justread = stream->filterhead->fops->read(stream, stream->filterhead,
stream->readbuf + stream->writepos,
stream->readbuflen - stream->writepos
TSRMLS_CC);
} else {
justread = stream->ops->read(stream, stream->readbuf + stream->writepos,
stream->readbuflen - stream->writepos
TSRMLS_CC);
}
if (justread != (size_t)-1) {
stream->writepos += justread;
}
}
}
PHPAPI size_t _php_stream_read(php_stream *stream, char *buf, size_t size TSRMLS_DC)
{
size_t toread = 0, didread = 0;
while (size > 0) {
/* take from the read buffer first.
* It is possible that a buffered stream was switched to non-buffered, so we
* drain the remainder of the buffer before using the "raw" read mode for
* the excess */
if (stream->writepos > stream->readpos) {
toread = stream->writepos - stream->readpos;
if (toread > size)
toread = size;
memcpy(buf, stream->readbuf + stream->readpos, toread);
stream->readpos += toread;
size -= toread;
buf += toread;
didread += toread;
}
/* ignore eof here; the underlying state might have changed */
if (size == 0) {
break;
}
if (stream->flags & PHP_STREAM_FLAG_NO_BUFFER || stream->chunk_size == 1) {
if (stream->filterhead) {
toread = stream->filterhead->fops->read(stream, stream->filterhead,
buf, size
TSRMLS_CC);
} else {
toread = stream->ops->read(stream, buf, size TSRMLS_CC);
}
} else {
php_stream_fill_read_buffer(stream, size TSRMLS_CC);
toread = stream->writepos - stream->readpos;
if (toread > size)
toread = size;
if (toread > 0) {
memcpy(buf, stream->readbuf + stream->readpos, toread);
stream->readpos += toread;
}
}
if (toread > 0) {
didread += toread;
buf += toread;
size -= toread;
} else {
/* EOF, or temporary end of data (for non-blocking mode). */
break;
}
if (stream->flags & PHP_STREAM_FLAG_AVOID_BLOCKING) {
break;
}
/* just break anyway, to avoid greedy read */
if (stream->wrapper != &php_plain_files_wrapper)
break;
}
if (didread > 0)
stream->position += didread;
return didread;
}
PHPAPI int _php_stream_eof(php_stream *stream TSRMLS_DC)
{
/* if there is data in the buffer, it's not EOF */
if (stream->writepos - stream->readpos > 0)
return 0;
if (!stream->eof && php_stream_is(stream, PHP_STREAM_IS_SOCKET)) {
stream->eof = !_php_network_is_stream_alive(stream TSRMLS_CC);
}
return stream->eof;
}
PHPAPI int _php_stream_putc(php_stream *stream, int c TSRMLS_DC)
{
unsigned char buf = c;
if (php_stream_write(stream, &buf, 1) > 0) {
return 1;
}
return EOF;
}
PHPAPI int _php_stream_getc(php_stream *stream TSRMLS_DC)
{
unsigned char buf;
if (php_stream_read(stream, &buf, 1) > 0) {
return buf & 0xff;
}
return EOF;
}
PHPAPI int _php_stream_puts(php_stream *stream, char *buf TSRMLS_DC)
{
int len;
char newline[2] = "\n"; /* is this OK for Win? */
len = strlen(buf);
if (len > 0 && php_stream_write(stream, buf, len) && php_stream_write(stream, newline, 1)) {
return 1;
}
return 0;
}
PHPAPI int _php_stream_stat(php_stream *stream, php_stream_statbuf *ssb TSRMLS_DC)
{
memset(ssb, 0, sizeof(*ssb));
/* if the stream was wrapped, allow the wrapper to stat it */
if (stream->wrapper && stream->wrapper->wops->stream_stat != NULL) {
return stream->wrapper->wops->stream_stat(stream->wrapper, stream, ssb TSRMLS_CC);
}
/* if the stream doesn't directly support stat-ing, return with failure.
* We could try and emulate this by casting to a FD and fstat-ing it,
* but since the fd might not represent the actual underlying content
* this would give bogus results. */
if (stream->ops->stat == NULL) {
return -1;
}
return (stream->ops->stat)(stream, ssb TSRMLS_CC);
}
PHPAPI char *php_stream_locate_eol(php_stream *stream, char *buf, size_t buf_len TSRMLS_DC)
{
size_t avail;
char *cr, *lf, *eol = NULL;
char *readptr;
if (!buf) {
readptr = stream->readbuf + stream->readpos;
avail = stream->writepos - stream->readpos;
} else {
readptr = buf;
avail = buf_len;
}
/* Look for EOL */
if (stream->flags & PHP_STREAM_FLAG_DETECT_EOL) {
cr = memchr(readptr, '\r', avail);
lf = memchr(readptr, '\n', avail);
if (cr && lf != cr + 1 && !(lf && lf < cr)) {
/* mac */
stream->flags ^= PHP_STREAM_FLAG_DETECT_EOL;
stream->flags |= PHP_STREAM_FLAG_EOL_MAC;
eol = cr;
} else if ((cr && lf && cr == lf - 1) || (lf)) {
/* dos or unix endings */
stream->flags ^= PHP_STREAM_FLAG_DETECT_EOL;
eol = lf;
}
} else if (stream->flags & PHP_STREAM_FLAG_EOL_MAC) {
eol = memchr(readptr, '\r', avail);
} else {
/* unix (and dos) line endings */
eol = memchr(readptr, '\n', avail);
}
return eol;
}
/* If buf == NULL, the buffer will be allocated automatically and will be of an
* appropriate length to hold the line, regardless of the line length, memory
* permitting */
PHPAPI char *_php_stream_get_line(php_stream *stream, char *buf, size_t maxlen,
size_t *returned_len TSRMLS_DC)
{
size_t avail = 0;
size_t current_buf_size = 0;
size_t total_copied = 0;
int grow_mode = 0;
char *bufstart = buf;
if (buf == NULL)
grow_mode = 1;
else if (maxlen == 0)
return NULL;
/*
* If the underlying stream operations block when no new data is readable,
* we need to take extra precautions.
*
* If there is buffered data available, we check for a EOL. If it exists,
* we pass the data immediately back to the caller. This saves a call
* to the read implementation and will not block where blocking
* is not necessary at all.
*
* If the stream buffer contains more data than the caller requested,
* we can also avoid that costly step and simply return that data.
*/
for (;;) {
avail = stream->writepos - stream->readpos;
if (avail > 0) {
size_t cpysz = 0;
char *readptr;
char *eol;
int done = 0;
readptr = stream->readbuf + stream->readpos;
eol = php_stream_locate_eol(stream, NULL, 0 TSRMLS_CC);
if (eol) {
cpysz = eol - readptr + 1;
done = 1;
} else {
cpysz = avail;
}
if (grow_mode) {
/* allow room for a NUL. If this realloc is really a realloc
* (ie: second time around), we get an extra byte. In most
* cases, with the default chunk size of 8K, we will only
* incur that overhead once. When people have lines longer
* than 8K, we waste 1 byte per additional 8K or so.
* That seems acceptable to me, to avoid making this code
* hard to follow */
bufstart = erealloc(bufstart, current_buf_size + cpysz + 1);
current_buf_size += cpysz + 1;
buf = bufstart + total_copied;
} else {
if (cpysz >= maxlen - 1) {
cpysz = maxlen - 1;
done = 1;
}
}
memcpy(buf, readptr, cpysz);
stream->position += cpysz;
stream->readpos += cpysz;
buf += cpysz;
maxlen -= cpysz;
total_copied += cpysz;
if (done) {
break;
}
} else if (stream->eof) {
break;
} else {
/* XXX: Should be fine to always read chunk_size */
size_t toread;
if (grow_mode) {
toread = stream->chunk_size;
} else {
toread = maxlen - 1;
if (toread > stream->chunk_size)
toread = stream->chunk_size;
}
php_stream_fill_read_buffer(stream, toread TSRMLS_CC);
if (stream->writepos - stream->readpos == 0) {
break;
}
}
}
if (total_copied == 0) {
if (grow_mode) {
assert(bufstart == NULL);
}
return NULL;
}
buf[0] = '\0';
if (returned_len)
*returned_len = total_copied;
return bufstart;
}
PHPAPI int _php_stream_flush(php_stream *stream, int closing TSRMLS_DC)
{
int ret = 0;
if (stream->filterhead)
stream->filterhead->fops->flush(stream, stream->filterhead, closing TSRMLS_CC);
if (stream->ops->flush) {
ret = stream->ops->flush(stream TSRMLS_CC);
}
return ret;
}
PHPAPI size_t _php_stream_write(php_stream *stream, const char *buf, size_t count TSRMLS_DC)
{
size_t didwrite = 0, towrite, justwrote;
assert(stream);
if (buf == NULL || count == 0 || stream->ops->write == NULL)
return 0;
/* if we have a seekable stream we need to ensure that data is written at the
* current stream->position. This means invalidating the read buffer and then
* performing a low-level seek */
if (stream->ops->seek && (stream->flags & PHP_STREAM_FLAG_NO_SEEK) == 0 && stream->writepos > stream->readpos) {
stream->readpos = stream->writepos = 0;
stream->ops->seek(stream, stream->position, SEEK_SET, &stream->position TSRMLS_CC);
}
while (count > 0) {
towrite = count;
if (towrite > stream->chunk_size)
towrite = stream->chunk_size;
if (stream->filterhead) {
justwrote = stream->filterhead->fops->write(stream, stream->filterhead, buf, towrite TSRMLS_CC);
} else {
justwrote = stream->ops->write(stream, buf, towrite TSRMLS_CC);
}
/* convert justwrote to an integer, since normally it is unsigned */
if ((int)justwrote > 0) {
buf += justwrote;
count -= justwrote;
didwrite += justwrote;
/* Only screw with the buffer if we can seek, otherwise we lose data
* buffered from fifos and sockets */
if (stream->ops->seek && (stream->flags & PHP_STREAM_FLAG_NO_SEEK) == 0) {
stream->position += justwrote;
}
} else {
break;
}
}
return didwrite;
}
PHPAPI size_t _php_stream_printf(php_stream *stream TSRMLS_DC, const char *fmt, ...)
{
size_t count;
char *buf;
va_list ap;
va_start(ap, fmt);
count = vspprintf(&buf, 0, fmt, ap);
va_end(ap);
if (!buf)
return 0; /* error condition */
count = php_stream_write(stream, buf, count);
efree(buf);
return count;
}
PHPAPI off_t _php_stream_tell(php_stream *stream TSRMLS_DC)
{
return stream->position;
}
PHPAPI int _php_stream_seek(php_stream *stream, off_t offset, int whence TSRMLS_DC)
{
/* handle the case where we are in the buffer */
if ((stream->flags & PHP_STREAM_FLAG_NO_BUFFER) == 0) {
switch(whence) {
case SEEK_CUR:
if (offset > 0 && offset < stream->writepos - stream->readpos) {
stream->readpos += offset;
stream->position += offset;
stream->eof = 0;
return 0;
}
break;
case SEEK_SET:
if (offset > stream->position &&
offset < stream->position + stream->writepos - stream->readpos) {
stream->readpos += offset - stream->position;
stream->position = offset;
stream->eof = 0;
return 0;
}
break;
}
}
if (stream->ops->seek && (stream->flags & PHP_STREAM_FLAG_NO_SEEK) == 0) {
int ret;
if (stream->filterhead)
stream->filterhead->fops->flush(stream, stream->filterhead, 0 TSRMLS_CC);
switch(whence) {
case SEEK_CUR: