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util: buffer: Reimplement virBuffer internals using glib's GString
GString is surprisingly similar to what libvirt was doing painstakingly manually. Yet it doesn't support the automatic indentation features we use for XML so we rather keep those in form of virBuffer using GString internally. Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa
parent
c721cc1670
commit
244f906b16
@ -21,7 +21,6 @@
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#include <config.h>
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#include <stdarg.h>
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#include "c-ctype.h"
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#include "virbuffer.h"
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#include "virerror.h"
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@ -40,10 +39,7 @@
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static void
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virBufferSetError(virBufferPtr buf, int error)
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{
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VIR_FREE(buf->content);
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buf->size = 0;
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buf->use = 0;
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buf->indent = 0;
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virBufferFreeAndReset(buf);
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buf->error = error;
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}
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@ -122,7 +118,7 @@ virBufferGetIndent(const virBuffer *buf)
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size_t
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virBufferGetEffectiveIndent(const virBuffer *buf)
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{
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if (buf->use && buf->content[buf->use - 1] != '\n')
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if (buf->str && buf->str->len && buf->str->str[buf->str->len - 1] != '\n')
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return 0;
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return buf->indent;
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@ -130,35 +126,38 @@ virBufferGetEffectiveIndent(const virBuffer *buf)
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/**
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* virBufferGrow:
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* virBufferInitialize
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* @buf: the buffer
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* @len: the minimum free size to allocate on top of existing used space
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*
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* Grow the available space of a buffer to at least @len bytes.
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*
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* Returns zero on success or -1 on error
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* Ensures that the internal GString container is allocated.
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*/
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static int
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virBufferGrow(virBufferPtr buf, unsigned int len)
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static void
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virBufferInitialize(virBufferPtr buf)
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{
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int size;
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if (buf->error)
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return -1;
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if ((len + buf->use) < buf->size)
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return 0;
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size = buf->use + len + 1000;
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if (VIR_REALLOC_N_QUIET(buf->content, size) < 0) {
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virBufferSetError(buf, errno);
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return -1;
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}
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buf->size = size;
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return 0;
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if (!buf->str)
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buf->str = g_string_new(NULL);
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}
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static void
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virBufferApplyIndent(virBufferPtr buf)
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{
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const char space[] = " ";
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size_t spacesz = sizeof(space) - 1;
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size_t toindent = virBufferGetEffectiveIndent(buf);
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if (toindent == 0)
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return;
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while (toindent > spacesz) {
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g_string_append_len(buf->str, space, spacesz);
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toindent -= spacesz;
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}
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g_string_append_len(buf->str, space, toindent);
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}
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/**
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* virBufferAdd:
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* @buf: the buffer to append to
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@ -172,25 +171,16 @@ virBufferGrow(virBufferPtr buf, unsigned int len)
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void
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virBufferAdd(virBufferPtr buf, const char *str, int len)
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{
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unsigned int needSize;
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size_t indent;
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if (!str || !buf || buf->error || (len == 0 && buf->indent == 0))
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return;
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indent = virBufferGetEffectiveIndent(buf);
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virBufferInitialize(buf);
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virBufferApplyIndent(buf);
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if (len < 0)
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len = strlen(str);
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needSize = buf->use + indent + len + 2;
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if (virBufferGrow(buf, needSize - buf->use) < 0)
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return;
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memset(&buf->content[buf->use], ' ', indent);
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memcpy(&buf->content[buf->use + indent], str, len);
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buf->use += indent + len;
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buf->content[buf->use] = '\0';
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g_string_append(buf->str, str);
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else
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g_string_append_len(buf->str, str, len);
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}
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/**
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@ -207,7 +197,7 @@ virBufferAdd(virBufferPtr buf, const char *str, int len)
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void
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virBufferAddBuffer(virBufferPtr buf, virBufferPtr toadd)
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{
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if (!toadd)
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if (!toadd || !toadd->str)
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return;
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if (!buf)
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@ -219,12 +209,8 @@ virBufferAddBuffer(virBufferPtr buf, virBufferPtr toadd)
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goto cleanup;
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}
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if (virBufferGrow(buf, toadd->use) < 0)
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goto cleanup;
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memcpy(&buf->content[buf->use], toadd->content, toadd->use);
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buf->use += toadd->use;
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buf->content[buf->use] = '\0';
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virBufferInitialize(buf);
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g_string_append_len(buf->str, toadd->str->str, toadd->str->len);
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cleanup:
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virBufferFreeAndReset(toadd);
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@ -259,7 +245,12 @@ virBufferCurrentContent(virBufferPtr buf)
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{
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if (!buf || buf->error)
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return NULL;
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return buf->use ? buf->content : "";
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if (!buf->str ||
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buf->str->len == 0)
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return "";
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return buf->str->str;
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}
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/**
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@ -277,16 +268,14 @@ virBufferCurrentContent(virBufferPtr buf)
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char *
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virBufferContentAndReset(virBufferPtr buf)
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{
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char *str;
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if (buf == NULL)
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char *str = NULL;
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if (!buf)
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return NULL;
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if (buf->error) {
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memset(buf, 0, sizeof(*buf));
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return NULL;
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}
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if (buf->str)
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str = g_string_free(buf->str, false);
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str = buf->content;
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memset(buf, 0, sizeof(*buf));
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return str;
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}
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@ -299,8 +288,13 @@ virBufferContentAndReset(virBufferPtr buf)
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*/
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void virBufferFreeAndReset(virBufferPtr buf)
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{
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if (buf)
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virBufferSetError(buf, 0);
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if (!buf)
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return;
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if (buf->str)
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g_string_free(buf->str, true);
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memset(buf, 0, sizeof(*buf));
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}
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/**
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@ -360,10 +354,10 @@ virBufferCheckErrorInternal(const virBuffer *buf,
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size_t
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virBufferUse(const virBuffer *buf)
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{
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if (buf == NULL)
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if (!buf || !buf->str)
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return 0;
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return buf->use;
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return buf->str->len;
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}
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/**
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@ -394,48 +388,16 @@ virBufferAsprintf(virBufferPtr buf, const char *format, ...)
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void
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virBufferVasprintf(virBufferPtr buf, const char *format, va_list argptr)
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{
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int size, count, grow_size;
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va_list copy;
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if ((format == NULL) || (buf == NULL))
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return;
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if (buf->error)
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return;
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virBufferAddLit(buf, ""); /* auto-indent */
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virBufferInitialize(buf);
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virBufferApplyIndent(buf);
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if (buf->size == 0 &&
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virBufferGrow(buf, 100) < 0)
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return;
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va_copy(copy, argptr);
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size = buf->size - buf->use;
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if ((count = vsnprintf(&buf->content[buf->use],
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size, format, copy)) < 0) {
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virBufferSetError(buf, errno);
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va_end(copy);
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return;
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}
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va_end(copy);
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/* Grow buffer if necessary and retry */
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if (count >= size) {
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buf->content[buf->use] = 0;
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grow_size = (count + 1 > 1000) ? count + 1 : 1000;
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if (virBufferGrow(buf, grow_size) < 0)
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return;
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size = buf->size - buf->use;
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if ((count = vsnprintf(&buf->content[buf->use],
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size, format, argptr)) < 0) {
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virBufferSetError(buf, errno);
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return;
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}
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}
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buf->use += count;
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g_string_append_vprintf(buf->str, format, argptr);
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}
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@ -638,16 +600,6 @@ virBufferEscape(virBufferPtr buf, char escape, const char *toescape,
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}
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static bool
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virBufferURIEncodeCharIsUnencoded(char c)
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{
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if (c == '-' || c == '.' || c == '_' || c == '~')
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return true;
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return c_isalnum(c);
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}
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/**
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* virBufferURIEncodeString:
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* @buf: the buffer to append to
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@ -660,41 +612,16 @@ virBufferURIEncodeCharIsUnencoded(char c)
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void
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virBufferURIEncodeString(virBufferPtr buf, const char *str)
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{
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int grow_size = 0;
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const char *p;
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unsigned char uc;
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const char *hex = "0123456789ABCDEF";
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if ((buf == NULL) || (str == NULL))
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return;
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if (buf->error)
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return;
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virBufferAddLit(buf, ""); /* auto-indent */
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virBufferInitialize(buf);
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virBufferApplyIndent(buf);
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for (p = str; *p; ++p) {
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if (virBufferURIEncodeCharIsUnencoded(*p))
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grow_size++;
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else
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grow_size += 3; /* %ab */
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}
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if (virBufferGrow(buf, grow_size) < 0)
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return;
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for (p = str; *p; ++p) {
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if (virBufferURIEncodeCharIsUnencoded(*p)) {
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buf->content[buf->use++] = *p;
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} else {
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uc = (unsigned char) *p;
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buf->content[buf->use++] = '%';
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buf->content[buf->use++] = hex[uc >> 4];
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buf->content[buf->use++] = hex[uc & 0xf];
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}
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}
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buf->content[buf->use] = '\0';
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g_string_append_uri_escaped(buf->str, str, NULL, false);
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}
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/**
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@ -810,21 +737,27 @@ virBufferTrim(virBufferPtr buf, const char *str, int len)
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{
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size_t len2 = 0;
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if (!buf || buf->error)
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if (!buf || buf->error || !buf->str)
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return;
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if (!str && len < 0)
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return;
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if (len > 0 && len > buf->use)
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if (len > 0 && len > buf->str->len)
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return;
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if (str) {
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len2 = strlen(str);
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if (len2 > buf->use ||
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memcmp(&buf->content[buf->use - len2], str, len2) != 0)
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if (len2 > buf->str->len ||
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memcmp(&buf->str->str[buf->str->len - len2], str, len2) != 0)
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return;
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}
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buf->use -= len < 0 ? len2 : len;
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buf->content[buf->use] = '\0';
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if (len < 0)
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len = len2;
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g_string_truncate(buf->str, buf->str->len - len);
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}
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@ -33,14 +33,12 @@
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typedef struct _virBuffer virBuffer;
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typedef virBuffer *virBufferPtr;
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#define VIR_BUFFER_INITIALIZER { 0, 0, 0, 0, NULL }
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#define VIR_BUFFER_INITIALIZER { NULL, 0, 0 }
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struct _virBuffer {
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size_t size;
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size_t use;
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GString *str;
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int error; /* errno value, or -1 for usage error */
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int indent;
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char *content;
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};
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const char *virBufferCurrentContent(virBufferPtr buf);
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