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1304 lines (1197 loc) · 32.1 KB
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/*
* buf.c: memory buffers for libxml2
*
* new buffer structures and entry points to simplify the maintainance
* of libxml2 and ensure we keep good control over memory allocations
* and stay 64 bits clean.
* The new entry point use the xmlBufPtr opaque structure and
* xmlBuf...() counterparts to the old xmlBuf...() functions
*
* See Copyright for the status of this software.
*
* daniel@veillard.com
*/
#define IN_LIBXML
#include "libxml.h"
#include <string.h> /* for memset() only ! */
#include <limits.h>
#ifdef HAVE_CTYPE_H
#include <ctype.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <libxml/tree.h>
#include <libxml/globals.h>
#include <libxml/tree.h>
#include "buf.h"
#define WITH_BUFFER_COMPAT
/**
* xmlBuf:
*
* A buffer structure. The base of the structure is somehow compatible
* with struct _xmlBuffer to limit risks on application which accessed
* directly the input->buf->buffer structures.
*/
struct _xmlBuf {
xmlChar *content; /* The buffer content UTF8 */
unsigned int compat_use; /* for binary compatibility */
unsigned int compat_size; /* for binary compatibility */
xmlBufferAllocationScheme alloc; /* The realloc method */
xmlChar *contentIO; /* in IO mode we may have a different base */
size_t use; /* The buffer size used */
size_t size; /* The buffer size */
xmlBufferPtr buffer; /* wrapper for an old buffer */
int error; /* an error code if a failure occured */
};
#ifdef WITH_BUFFER_COMPAT
/*
* Macro for compatibility with xmlBuffer to be used after an xmlBuf
* is updated. This makes sure the compat fields are updated too.
*/
#define UPDATE_COMPAT(buf) \
if (buf->size < INT_MAX) buf->compat_size = buf->size; \
else buf->compat_size = INT_MAX; \
if (buf->use < INT_MAX) buf->compat_use = buf->use; \
else buf->compat_use = INT_MAX;
/*
* Macro for compatibility with xmlBuffer to be used in all the xmlBuf
* entry points, it checks that the compat fields have not been modified
* by direct call to xmlBuffer function from code compiled before 2.9.0 .
*/
#define CHECK_COMPAT(buf) \
if (buf->size != (size_t) buf->compat_size) \
if (buf->compat_size < INT_MAX) \
buf->size = buf->compat_size; \
if (buf->use != (size_t) buf->compat_use) \
if (buf->compat_use < INT_MAX) \
buf->use = buf->compat_use;
#else /* ! WITH_BUFFER_COMPAT */
#define UPDATE_COMPAT(buf)
#define CHECK_COMPAT(buf)
#endif /* WITH_BUFFER_COMPAT */
/**
* xmlBufMemoryError:
* @extra: extra informations
*
* Handle an out of memory condition
* To be improved...
*/
static void
xmlBufMemoryError(xmlBufPtr buf, const char *extra)
{
__xmlSimpleError(XML_FROM_BUFFER, XML_ERR_NO_MEMORY, NULL, NULL, extra);
if ((buf) && (buf->error == 0))
buf->error = XML_ERR_NO_MEMORY;
}
/**
* xmlBufOverflowError:
* @extra: extra informations
*
* Handle a buffer overflow error
* To be improved...
*/
static void
xmlBufOverflowError(xmlBufPtr buf, const char *extra)
{
__xmlSimpleError(XML_FROM_BUFFER, XML_BUF_OVERFLOW, NULL, NULL, extra);
if ((buf) && (buf->error == 0))
buf->error = XML_BUF_OVERFLOW;
}
/**
* xmlBufCreate:
*
* routine to create an XML buffer.
* returns the new structure.
*/
xmlBufPtr
xmlBufCreate(void) {
xmlBufPtr ret;
ret = (xmlBufPtr) xmlMalloc(sizeof(xmlBuf));
if (ret == NULL) {
xmlBufMemoryError(NULL, "creating buffer");
return(NULL);
}
ret->compat_use = 0;
ret->use = 0;
ret->error = 0;
ret->buffer = NULL;
ret->size = xmlDefaultBufferSize;
ret->compat_size = xmlDefaultBufferSize;
ret->alloc = xmlBufferAllocScheme;
ret->content = (xmlChar *) xmlMallocAtomic(ret->size * sizeof(xmlChar));
if (ret->content == NULL) {
xmlBufMemoryError(ret, "creating buffer");
xmlFree(ret);
return(NULL);
}
ret->content[0] = 0;
ret->contentIO = NULL;
return(ret);
}
/**
* xmlBufCreateSize:
* @size: initial size of buffer
*
* routine to create an XML buffer.
* returns the new structure.
*/
xmlBufPtr
xmlBufCreateSize(size_t size) {
xmlBufPtr ret;
ret = (xmlBufPtr) xmlMalloc(sizeof(xmlBuf));
if (ret == NULL) {
xmlBufMemoryError(NULL, "creating buffer");
return(NULL);
}
ret->compat_use = 0;
ret->use = 0;
ret->error = 0;
ret->buffer = NULL;
ret->alloc = xmlBufferAllocScheme;
ret->size = (size ? size+2 : 0); /* +1 for ending null */
ret->compat_size = (int) ret->size;
if (ret->size){
ret->content = (xmlChar *) xmlMallocAtomic(ret->size * sizeof(xmlChar));
if (ret->content == NULL) {
xmlBufMemoryError(ret, "creating buffer");
xmlFree(ret);
return(NULL);
}
ret->content[0] = 0;
} else
ret->content = NULL;
ret->contentIO = NULL;
return(ret);
}
/**
* xmlBufDetach:
* @buf: the buffer
*
* Remove the string contained in a buffer and give it back to the
* caller. The buffer is reset to an empty content.
* This doesn't work with immutable buffers as they can't be reset.
*
* Returns the previous string contained by the buffer.
*/
xmlChar *
xmlBufDetach(xmlBufPtr buf) {
xmlChar *ret;
if (buf == NULL)
return(NULL);
if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE)
return(NULL);
if (buf->buffer != NULL)
return(NULL);
if (buf->error)
return(NULL);
ret = buf->content;
buf->content = NULL;
buf->size = 0;
buf->use = 0;
buf->compat_use = 0;
buf->compat_size = 0;
return ret;
}
/**
* xmlBufCreateStatic:
* @mem: the memory area
* @size: the size in byte
*
* routine to create an XML buffer from an immutable memory area.
* The area won't be modified nor copied, and is expected to be
* present until the end of the buffer lifetime.
*
* returns the new structure.
*/
xmlBufPtr
xmlBufCreateStatic(void *mem, size_t size) {
xmlBufPtr ret;
if ((mem == NULL) || (size == 0))
return(NULL);
ret = (xmlBufPtr) xmlMalloc(sizeof(xmlBuf));
if (ret == NULL) {
xmlBufMemoryError(NULL, "creating buffer");
return(NULL);
}
if (size < INT_MAX) {
ret->compat_use = size;
ret->compat_size = size;
} else {
ret->compat_use = INT_MAX;
ret->compat_size = INT_MAX;
}
ret->use = size;
ret->size = size;
ret->alloc = XML_BUFFER_ALLOC_IMMUTABLE;
ret->content = (xmlChar *) mem;
ret->error = 0;
ret->buffer = NULL;
return(ret);
}
/**
* xmlBufGetAllocationScheme:
* @buf: the buffer
*
* Get the buffer allocation scheme
*
* Returns the scheme or -1 in case of error
*/
int
xmlBufGetAllocationScheme(xmlBufPtr buf) {
if (buf == NULL) {
#ifdef DEBUG_BUFFER
xmlGenericError(xmlGenericErrorContext,
"xmlBufGetAllocationScheme: buf == NULL\n");
#endif
return(-1);
}
return(buf->alloc);
}
/**
* xmlBufSetAllocationScheme:
* @buf: the buffer to tune
* @scheme: allocation scheme to use
*
* Sets the allocation scheme for this buffer
*
* returns 0 in case of success and -1 in case of failure
*/
int
xmlBufSetAllocationScheme(xmlBufPtr buf,
xmlBufferAllocationScheme scheme) {
if ((buf == NULL) || (buf->error != 0)) {
#ifdef DEBUG_BUFFER
xmlGenericError(xmlGenericErrorContext,
"xmlBufSetAllocationScheme: buf == NULL or in error\n");
#endif
return(-1);
}
if ((buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) ||
(buf->alloc == XML_BUFFER_ALLOC_IO))
return(-1);
if ((scheme == XML_BUFFER_ALLOC_DOUBLEIT) ||
(scheme == XML_BUFFER_ALLOC_EXACT) ||
(scheme == XML_BUFFER_ALLOC_HYBRID) ||
(scheme == XML_BUFFER_ALLOC_IMMUTABLE)) {
buf->alloc = scheme;
if (buf->buffer)
buf->buffer->alloc = scheme;
return(0);
}
/*
* Switching a buffer ALLOC_IO has the side effect of initializing
* the contentIO field with the current content
*/
if (scheme == XML_BUFFER_ALLOC_IO) {
buf->alloc = XML_BUFFER_ALLOC_IO;
buf->contentIO = buf->content;
}
return(-1);
}
/**
* xmlBufFree:
* @buf: the buffer to free
*
* Frees an XML buffer. It frees both the content and the structure which
* encapsulate it.
*/
void
xmlBufFree(xmlBufPtr buf) {
if (buf == NULL) {
#ifdef DEBUG_BUFFER
xmlGenericError(xmlGenericErrorContext,
"xmlBufFree: buf == NULL\n");
#endif
return;
}
if ((buf->alloc == XML_BUFFER_ALLOC_IO) &&
(buf->contentIO != NULL)) {
xmlFree(buf->contentIO);
} else if ((buf->content != NULL) &&
(buf->alloc != XML_BUFFER_ALLOC_IMMUTABLE)) {
xmlFree(buf->content);
}
xmlFree(buf);
}
/**
* xmlBufEmpty:
* @buf: the buffer
*
* empty a buffer.
*/
void
xmlBufEmpty(xmlBufPtr buf) {
if ((buf == NULL) || (buf->error != 0)) return;
if (buf->content == NULL) return;
CHECK_COMPAT(buf)
buf->use = 0;
if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) {
buf->content = BAD_CAST "";
} else if ((buf->alloc == XML_BUFFER_ALLOC_IO) &&
(buf->contentIO != NULL)) {
size_t start_buf = buf->content - buf->contentIO;
buf->size += start_buf;
buf->content = buf->contentIO;
buf->content[0] = 0;
} else {
buf->content[0] = 0;
}
UPDATE_COMPAT(buf)
}
/**
* xmlBufShrink:
* @buf: the buffer to dump
* @len: the number of xmlChar to remove
*
* Remove the beginning of an XML buffer.
* NOTE that this routine behaviour differs from xmlBufferShrink()
* as it will return 0 on error instead of -1 due to size_t being
* used as the return type.
*
* Returns the number of byte removed or 0 in case of failure
*/
size_t
xmlBufShrink(xmlBufPtr buf, size_t len) {
if ((buf == NULL) || (buf->error != 0)) return(0);
CHECK_COMPAT(buf)
if (len == 0) return(0);
if (len > buf->use) return(0);
buf->use -= len;
if ((buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) ||
((buf->alloc == XML_BUFFER_ALLOC_IO) && (buf->contentIO != NULL))) {
/*
* we just move the content pointer, but also make sure
* the perceived buffer size has shrinked accordingly
*/
buf->content += len;
buf->size -= len;
/*
* sometimes though it maybe be better to really shrink
* on IO buffers
*/
if ((buf->alloc == XML_BUFFER_ALLOC_IO) && (buf->contentIO != NULL)) {
size_t start_buf = buf->content - buf->contentIO;
if (start_buf >= buf->size) {
memmove(buf->contentIO, &buf->content[0], buf->use);
buf->content = buf->contentIO;
buf->content[buf->use] = 0;
buf->size += start_buf;
}
}
} else {
memmove(buf->content, &buf->content[len], buf->use);
buf->content[buf->use] = 0;
}
UPDATE_COMPAT(buf)
return(len);
}
/**
* xmlBufGrowInternal:
* @buf: the buffer
* @len: the minimum free size to allocate
*
* Grow the available space of an XML buffer, @len is the target value
* Error checking should be done on buf->error since using the return
* value doesn't work that well
*
* Returns 0 in case of error or the length made available otherwise
*/
static size_t
xmlBufGrowInternal(xmlBufPtr buf, size_t len) {
size_t size;
xmlChar *newbuf;
if ((buf == NULL) || (buf->error != 0)) return(0);
CHECK_COMPAT(buf)
if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return(0);
if (buf->use + len < buf->size)
return(buf->size - buf->use);
/*
* Windows has a BIG problem on realloc timing, so we try to double
* the buffer size (if that's enough) (bug 146697)
* Apparently BSD too, and it's probably best for linux too
* On an embedded system this may be something to change
*/
#if 1
if (buf->size > (size_t) len)
size = buf->size * 2;
else
size = buf->use + len + 100;
#else
size = buf->use + len + 100;
#endif
if ((buf->alloc == XML_BUFFER_ALLOC_IO) && (buf->contentIO != NULL)) {
size_t start_buf = buf->content - buf->contentIO;
newbuf = (xmlChar *) xmlRealloc(buf->contentIO, start_buf + size);
if (newbuf == NULL) {
xmlBufMemoryError(buf, "growing buffer");
return(0);
}
buf->contentIO = newbuf;
buf->content = newbuf + start_buf;
} else {
newbuf = (xmlChar *) xmlRealloc(buf->content, size);
if (newbuf == NULL) {
xmlBufMemoryError(buf, "growing buffer");
return(0);
}
buf->content = newbuf;
}
buf->size = size;
UPDATE_COMPAT(buf)
return(buf->size - buf->use);
}
/**
* xmlBufGrow:
* @buf: the buffer
* @len: the minimum free size to allocate
*
* Grow the available space of an XML buffer, @len is the target value
* This is been kept compatible with xmlBufferGrow() as much as possible
*
* Returns -1 in case of error or the length made available otherwise
*/
int
xmlBufGrow(xmlBufPtr buf, int len) {
size_t ret;
if ((buf == NULL) || (len < 0)) return(-1);
if (len == 0)
return(0);
ret = xmlBufGrowInternal(buf, len);
if (buf->error != 0)
return(-1);
return((int) ret);
}
/**
* xmlBufInflate:
* @buf: the buffer
* @len: the minimum extra free size to allocate
*
* Grow the available space of an XML buffer, adding at least @len bytes
*
* Returns 0 if successful or -1 in case of error
*/
int
xmlBufInflate(xmlBufPtr buf, size_t len) {
if (buf == NULL) return(-1);
xmlBufGrowInternal(buf, len + buf->size);
if (buf->error)
return(-1);
return(0);
}
/**
* xmlBufDump:
* @file: the file output
* @buf: the buffer to dump
*
* Dumps an XML buffer to a FILE *.
* Returns the number of #xmlChar written
*/
size_t
xmlBufDump(FILE *file, xmlBufPtr buf) {
size_t ret;
if ((buf == NULL) || (buf->error != 0)) {
#ifdef DEBUG_BUFFER
xmlGenericError(xmlGenericErrorContext,
"xmlBufDump: buf == NULL or in error\n");
#endif
return(0);
}
if (buf->content == NULL) {
#ifdef DEBUG_BUFFER
xmlGenericError(xmlGenericErrorContext,
"xmlBufDump: buf->content == NULL\n");
#endif
return(0);
}
CHECK_COMPAT(buf)
if (file == NULL)
file = stdout;
ret = fwrite(buf->content, sizeof(xmlChar), buf->use, file);
return(ret);
}
/**
* xmlBufContent:
* @buf: the buffer
*
* Function to extract the content of a buffer
*
* Returns the internal content
*/
xmlChar *
xmlBufContent(const xmlBufPtr buf)
{
if ((!buf) || (buf->error))
return NULL;
return(buf->content);
}
/**
* xmlBufEnd:
* @buf: the buffer
*
* Function to extract the end of the content of a buffer
*
* Returns the end of the internal content or NULL in case of error
*/
xmlChar *
xmlBufEnd(const xmlBufPtr buf)
{
if ((!buf) || (buf->error))
return NULL;
CHECK_COMPAT(buf)
return(&buf->content[buf->use]);
}
/**
* xmlBufAddLen:
* @buf: the buffer
* @len: the size which were added at the end
*
* Sometime data may be added at the end of the buffer without
* using the xmlBuf APIs that is used to expand the used space
* and set the zero terminating at the end of the buffer
*
* Returns -1 in case of error and 0 otherwise
*/
int
xmlBufAddLen(xmlBufPtr buf, size_t len) {
if ((buf == NULL) || (buf->error))
return(-1);
CHECK_COMPAT(buf)
if (len > (buf->size - buf->use))
return(-1);
buf->use += len;
UPDATE_COMPAT(buf)
if (buf->size > buf->use)
buf->content[buf->use] = 0;
else
return(-1);
return(0);
}
/**
* xmlBufErase:
* @buf: the buffer
* @len: the size to erase at the end
*
* Sometime data need to be erased at the end of the buffer
*
* Returns -1 in case of error and 0 otherwise
*/
int
xmlBufErase(xmlBufPtr buf, size_t len) {
if ((buf == NULL) || (buf->error))
return(-1);
CHECK_COMPAT(buf)
if (len > buf->use)
return(-1);
buf->use -= len;
buf->content[buf->use] = 0;
UPDATE_COMPAT(buf)
return(0);
}
/**
* xmlBufLength:
* @buf: the buffer
*
* Function to get the length of a buffer
*
* Returns the length of data in the internal content
*/
size_t
xmlBufLength(const xmlBufPtr buf)
{
if ((!buf) || (buf->error))
return 0;
CHECK_COMPAT(buf)
return(buf->use);
}
/**
* xmlBufUse:
* @buf: the buffer
*
* Function to get the length of a buffer
*
* Returns the length of data in the internal content
*/
size_t
xmlBufUse(const xmlBufPtr buf)
{
if ((!buf) || (buf->error))
return 0;
CHECK_COMPAT(buf)
return(buf->use);
}
/**
* xmlBufAvail:
* @buf: the buffer
*
* Function to find how much free space is allocated but not
* used in the buffer. It does not account for the terminating zero
* usually needed
*
* Returns the amount or 0 if none or an error occured
*/
size_t
xmlBufAvail(const xmlBufPtr buf)
{
if ((!buf) || (buf->error))
return 0;
CHECK_COMPAT(buf)
return(buf->size - buf->use);
}
/**
* xmlBufIsEmpty:
* @buf: the buffer
*
* Tell if a buffer is empty
*
* Returns 0 if no, 1 if yes and -1 in case of error
*/
int
xmlBufIsEmpty(const xmlBufPtr buf)
{
if ((!buf) || (buf->error))
return(-1);
CHECK_COMPAT(buf)
return(buf->use == 0);
}
/**
* xmlBufResize:
* @buf: the buffer to resize
* @size: the desired size
*
* Resize a buffer to accommodate minimum size of @size.
*
* Returns 0 in case of problems, 1 otherwise
*/
int
xmlBufResize(xmlBufPtr buf, size_t size)
{
unsigned int newSize;
xmlChar* rebuf = NULL;
size_t start_buf;
if ((buf == NULL) || (buf->error))
return(0);
CHECK_COMPAT(buf)
if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return(0);
/* Don't resize if we don't have to */
if (size < buf->size)
return 1;
/* figure out new size */
switch (buf->alloc){
case XML_BUFFER_ALLOC_IO:
case XML_BUFFER_ALLOC_DOUBLEIT:
/*take care of empty case*/
newSize = (buf->size ? buf->size*2 : size + 10);
while (size > newSize) {
if (newSize > UINT_MAX / 2) {
xmlBufMemoryError(buf, "growing buffer");
return 0;
}
newSize *= 2;
}
break;
case XML_BUFFER_ALLOC_EXACT:
newSize = size+10;
break;
case XML_BUFFER_ALLOC_HYBRID:
if (buf->use < BASE_BUFFER_SIZE)
newSize = size;
else {
newSize = buf->size * 2;
while (size > newSize) {
if (newSize > UINT_MAX / 2) {
xmlBufMemoryError(buf, "growing buffer");
return 0;
}
newSize *= 2;
}
}
break;
default:
newSize = size+10;
break;
}
if ((buf->alloc == XML_BUFFER_ALLOC_IO) && (buf->contentIO != NULL)) {
start_buf = buf->content - buf->contentIO;
if (start_buf > newSize) {
/* move data back to start */
memmove(buf->contentIO, buf->content, buf->use);
buf->content = buf->contentIO;
buf->content[buf->use] = 0;
buf->size += start_buf;
} else {
rebuf = (xmlChar *) xmlRealloc(buf->contentIO, start_buf + newSize);
if (rebuf == NULL) {
xmlBufMemoryError(buf, "growing buffer");
return 0;
}
buf->contentIO = rebuf;
buf->content = rebuf + start_buf;
}
} else {
if (buf->content == NULL) {
rebuf = (xmlChar *) xmlMallocAtomic(newSize);
} else if (buf->size - buf->use < 100) {
rebuf = (xmlChar *) xmlRealloc(buf->content, newSize);
} else {
/*
* if we are reallocating a buffer far from being full, it's
* better to make a new allocation and copy only the used range
* and free the old one.
*/
rebuf = (xmlChar *) xmlMallocAtomic(newSize);
if (rebuf != NULL) {
memcpy(rebuf, buf->content, buf->use);
xmlFree(buf->content);
rebuf[buf->use] = 0;
}
}
if (rebuf == NULL) {
xmlBufMemoryError(buf, "growing buffer");
return 0;
}
buf->content = rebuf;
}
buf->size = newSize;
UPDATE_COMPAT(buf)
return 1;
}
/**
* xmlBufAdd:
* @buf: the buffer to dump
* @str: the #xmlChar string
* @len: the number of #xmlChar to add
*
* Add a string range to an XML buffer. if len == -1, the length of
* str is recomputed.
*
* Returns 0 successful, a positive error code number otherwise
* and -1 in case of internal or API error.
*/
int
xmlBufAdd(xmlBufPtr buf, const xmlChar *str, int len) {
unsigned int needSize;
if ((str == NULL) || (buf == NULL) || (buf->error))
return -1;
CHECK_COMPAT(buf)
if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return -1;
if (len < -1) {
#ifdef DEBUG_BUFFER
xmlGenericError(xmlGenericErrorContext,
"xmlBufAdd: len < 0\n");
#endif
return -1;
}
if (len == 0) return 0;
if (len < 0)
len = xmlStrlen(str);
if (len < 0) return -1;
if (len == 0) return 0;
needSize = buf->use + len + 2;
if (needSize > buf->size){
if (!xmlBufResize(buf, needSize)){
xmlBufMemoryError(buf, "growing buffer");
return XML_ERR_NO_MEMORY;
}
}
memmove(&buf->content[buf->use], str, len*sizeof(xmlChar));
buf->use += len;
buf->content[buf->use] = 0;
UPDATE_COMPAT(buf)
return 0;
}
/**
* xmlBufAddHead:
* @buf: the buffer
* @str: the #xmlChar string
* @len: the number of #xmlChar to add
*
* Add a string range to the beginning of an XML buffer.
* if len == -1, the length of @str is recomputed.
*
* Returns 0 successful, a positive error code number otherwise
* and -1 in case of internal or API error.
*/
int
xmlBufAddHead(xmlBufPtr buf, const xmlChar *str, int len) {
unsigned int needSize;
if ((buf == NULL) || (buf->error))
return(-1);
CHECK_COMPAT(buf)
if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return -1;
if (str == NULL) {
#ifdef DEBUG_BUFFER
xmlGenericError(xmlGenericErrorContext,
"xmlBufAddHead: str == NULL\n");
#endif
return -1;
}
if (len < -1) {
#ifdef DEBUG_BUFFER
xmlGenericError(xmlGenericErrorContext,
"xmlBufAddHead: len < 0\n");
#endif
return -1;
}
if (len == 0) return 0;
if (len < 0)
len = xmlStrlen(str);
if (len <= 0) return -1;
if ((buf->alloc == XML_BUFFER_ALLOC_IO) && (buf->contentIO != NULL)) {
size_t start_buf = buf->content - buf->contentIO;
if (start_buf > (unsigned int) len) {
/*
* We can add it in the space previously shrinked
*/
buf->content -= len;
memmove(&buf->content[0], str, len);
buf->use += len;
buf->size += len;
UPDATE_COMPAT(buf)
return(0);
}
}
needSize = buf->use + len + 2;
if (needSize > buf->size){
if (!xmlBufResize(buf, needSize)){
xmlBufMemoryError(buf, "growing buffer");
return XML_ERR_NO_MEMORY;
}
}
memmove(&buf->content[len], &buf->content[0], buf->use);
memmove(&buf->content[0], str, len);
buf->use += len;
buf->content[buf->use] = 0;
UPDATE_COMPAT(buf)
return 0;
}
/**
* xmlBufCat:
* @buf: the buffer to add to
* @str: the #xmlChar string
*
* Append a zero terminated string to an XML buffer.
*
* Returns 0 successful, a positive error code number otherwise
* and -1 in case of internal or API error.
*/
int
xmlBufCat(xmlBufPtr buf, const xmlChar *str) {
if ((buf == NULL) || (buf->error))
return(-1);
CHECK_COMPAT(buf)
if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return -1;
if (str == NULL) return -1;
return xmlBufAdd(buf, str, -1);
}
/**
* xmlBufCCat:
* @buf: the buffer to dump
* @str: the C char string
*
* Append a zero terminated C string to an XML buffer.
*
* Returns 0 successful, a positive error code number otherwise
* and -1 in case of internal or API error.
*/
int
xmlBufCCat(xmlBufPtr buf, const char *str) {
const char *cur;
if ((buf == NULL) || (buf->error))
return(-1);
CHECK_COMPAT(buf)
if (buf->alloc == XML_BUFFER_ALLOC_IMMUTABLE) return -1;
if (str == NULL) {
#ifdef DEBUG_BUFFER
xmlGenericError(xmlGenericErrorContext,
"xmlBufCCat: str == NULL\n");
#endif
return -1;
}
for (cur = str;*cur != 0;cur++) {