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util: buffer: Simplify handling of indent overflows

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Rather than setting usage error truncate the indentation level. Having
the output string misformated is way more useful to figure out where the
error lies rather than reporting an error after a giant formatter
function.

In testBufAutoIndent we now validate that the indentation is truncated
and testBufAddBuffer2 is removed since it became bogus.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2019-10-24 09:25:20 +02:00
parent 49037f94d2
commit e154e01ead
2 changed files with 8 additions and 35 deletions
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8
src/util/virbuffer.c
View File

@ -56,8 +56,8 @@ virBufferSetError(virBufferPtr buf, int error)
* negative to decrease). Automatic indentation is performed by all * negative to decrease). Automatic indentation is performed by all
* additive functions when the existing buffer is empty or ends with a * additive functions when the existing buffer is empty or ends with a
* newline (however, note that no indentation is added after newlines * newline (however, note that no indentation is added after newlines
* embedded in an appended string). If @indent would cause overflow, * embedded in an appended string). If @indent would cause overflow, the
* the buffer error indicator is set. * indentation level is truncated.
*/ */
void void
virBufferAdjustIndent(virBufferPtr buf, int indent) virBufferAdjustIndent(virBufferPtr buf, int indent)
@ -67,12 +67,12 @@ virBufferAdjustIndent(virBufferPtr buf, int indent)
if (indent > 0) { if (indent > 0) {
if (INT_MAX - indent < buf->indent) { if (INT_MAX - indent < buf->indent) {
virBufferSetError(buf, -1); buf->indent = INT_MAX;
return; return;
} }
} else { } else {
if (buf->indent < -indent) { if (buf->indent < -indent) {
virBufferSetError(buf, -1); buf->indent = 0;
return; return;
} }
} }

35
tests/virbuftest.c
View File

@ -85,12 +85,12 @@ static int testBufAutoIndent(const void *data G_GNUC_UNUSED)
ret = -1; ret = -1;
} }
virBufferAdjustIndent(buf, -3); virBufferAdjustIndent(buf, -3);
if (virBufferGetIndent(buf, false) != -1 || if (virBufferGetIndent(buf, false) != 0 ||
virBufferGetIndent(buf, true) != -1 || virBufferGetIndent(buf, true) != 0) {
virBufferError(buf) != -1) { VIR_TEST_DEBUG("Indentation level not truncated");
VIR_TEST_DEBUG("Usage error not flagged");
ret = -1; ret = -1;
} }
virBufferAdjustIndent(buf, 3);
virBufferFreeAndReset(buf); virBufferFreeAndReset(buf);
if (virBufferGetIndent(buf, false) != 0 || if (virBufferGetIndent(buf, false) != 0 ||
virBufferGetIndent(buf, true) != 0 || virBufferGetIndent(buf, true) != 0 ||
@ -298,32 +298,6 @@ static int testBufAddBuffer(const void *data G_GNUC_UNUSED)
return ret; return ret;
} }
static int
testBufAddBuffer2(const void *opaque G_GNUC_UNUSED)
{
g_auto(virBuffer) buf1 = VIR_BUFFER_INITIALIZER;
g_auto(virBuffer) buf2 = VIR_BUFFER_INITIALIZER;
/* Intent of this test is to demonstrate a memleak that happen with
* virBufferAddBuffer */
virBufferAddLit(&buf1, "Hello world!\n");
virBufferAddLit(&buf2, "Hello world!\n");
/* Intentional usage error */
virBufferAdjustIndent(&buf2, -2);
virBufferAddBuffer(&buf1, &buf2);
if (virBufferCurrentContent(&buf1) ||
!virBufferCurrentContent(&buf2)) {
VIR_TEST_DEBUG("Unexpected buffer content");
return -1;
}
return 0;
}
struct testBufAddStrData { struct testBufAddStrData {
const char *data; const char *data;
const char *expect; const char *expect;
@ -481,7 +455,6 @@ mymain(void)
DO_TEST("Auto-indentation", testBufAutoIndent, 0); DO_TEST("Auto-indentation", testBufAutoIndent, 0);
DO_TEST("Trim", testBufTrim, 0); DO_TEST("Trim", testBufTrim, 0);
DO_TEST("AddBuffer", testBufAddBuffer, 0); DO_TEST("AddBuffer", testBufAddBuffer, 0);
DO_TEST("AddBuffer2", testBufAddBuffer2, 0);
DO_TEST("set indent", testBufSetIndent, 0); DO_TEST("set indent", testBufSetIndent, 0);
DO_TEST("autoclean", testBufferAutoclean, 0); DO_TEST("autoclean", testBufferAutoclean, 0);