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Introduce virFilePrintf() as a portable fprintf()

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We can't use GNULIB's fprintf-posix due to licensing
incompatibilities. We do already have a portable
formatting via virAsprintf() which we got from GNULIB
though. We can use to create a virFilePrintf() function.

But really gnulib could just provide a 'fprintf'
module, that depended on just its 'asprintf' module.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2013-05-17 15:11:24 +01:00 committed by Eric Blake
parent fae2505eee
commit a261996255
5 changed files with 74 additions and 36 deletions
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1
src/libvirt_private.syms
View File

@ -1305,6 +1305,7 @@ virFileMatchesNameSuffix;
virFileNBDDeviceAssociate;
virFileOpenAs;
virFileOpenTty;
virFilePrintf;
virFileReadAll;
virFileReadLimFD;
virFileResolveAllLinks;

34
src/util/virfile.c
View File

@ -2318,3 +2318,37 @@ virFileSanitizePath(const char *path)
return cleanpath;
}
/**
* virFilePrintf:
*
* A replacement for fprintf() which uses virVasprintf to
* ensure that portable string format placeholders can be
* used, since gnulib's fprintf() replacement is not
* LGPLV2+ compatible
*/
int virFilePrintf(FILE *fp, const char *msg, ...)
{
va_list vargs;
char *str;
int ret;
va_start(vargs, msg);
if ((ret = virVasprintf(&str, msg, vargs)) < 0)
goto cleanup;
if (fwrite(str, 1, ret, fp) != ret) {
virReportSystemError(errno, "%s",
_("Could not write to stream"));
ret = -1;
}
VIR_FREE(str);
cleanup:
va_end(vargs);
return ret;
}

3
src/util/virfile.h
View File

@ -229,4 +229,7 @@ void virFileWaitForDevices(void);
virBuildPathInternal(path, __VA_ARGS__, NULL)
int virBuildPathInternal(char **path, ...) ATTRIBUTE_SENTINEL;
int virFilePrintf(FILE *fp, const char *msg, ...)
ATTRIBUTE_FMT_PRINTF(2, 3);
#endif /* __VIR_FILE_H */

38
tests/fdstreamtest.c
View File

@ -105,16 +105,16 @@ static int testFDStreamReadCommon(const char *scratchdir, bool blocking)
usleep(20 * 1000);
goto reread;
}
fprintf(stderr, "Failed to read stream: %s\n",
virGetLastErrorMessage());
virFilePrintf(stderr, "Failed to read stream: %s\n",
virGetLastErrorMessage());
goto cleanup;
}
if (got == 0) {
/* Expect EOF 1/2 through last pattern */
if (i == 9 && want == (PATTERN_LEN / 2))
break;
fprintf(stderr, "Unexpected EOF block %zu want %zu\n",
i, want);
virFilePrintf(stderr, "Unexpected EOF block %zu want %zu\n",
i, want);
goto cleanup;
}
offset += got;
@ -122,25 +122,25 @@ static int testFDStreamReadCommon(const char *scratchdir, bool blocking)
}
if (i == 0) {
if (memcmp(buf, pattern + (PATTERN_LEN / 2), PATTERN_LEN / 2) != 0) {
fprintf(stderr, "Mismatched pattern data iteration %zu\n", i);
virFilePrintf(stderr, "Mismatched pattern data iteration %zu\n", i);
goto cleanup;
}
} else if (i == 9) {
if (memcmp(buf, pattern, PATTERN_LEN / 2) != 0) {
fprintf(stderr, "Mismatched pattern data iteration %zu\n", i);
virFilePrintf(stderr, "Mismatched pattern data iteration %zu\n", i);
goto cleanup;
}
} else {
if (memcmp(buf, pattern, PATTERN_LEN) != 0) {
fprintf(stderr, "Mismatched pattern data iteration %zu\n", i);
virFilePrintf(stderr, "Mismatched pattern data iteration %zu\n", i);
goto cleanup;
}
}
}
if (st->driver->streamFinish(st) != 0) {
fprintf(stderr, "Failed to finish stream: %s\n",
virGetLastErrorMessage());
virFilePrintf(stderr, "Failed to finish stream: %s\n",
virGetLastErrorMessage());
goto cleanup;
}
@ -229,8 +229,8 @@ static int testFDStreamWriteCommon(const char *scratchdir, bool blocking)
if (i == 9 &&
want == (PATTERN_LEN / 2))
break;
fprintf(stderr, "Failed to write stream: %s\n",
virGetLastErrorMessage());
virFilePrintf(stderr, "Failed to write stream: %s\n",
virGetLastErrorMessage());
goto cleanup;
}
offset += got;
@ -239,8 +239,8 @@ static int testFDStreamWriteCommon(const char *scratchdir, bool blocking)
}
if (st->driver->streamFinish(st) != 0) {
fprintf(stderr, "Failed to finish stream: %s\n",
virGetLastErrorMessage());
virFilePrintf(stderr, "Failed to finish stream: %s\n",
virGetLastErrorMessage());
goto cleanup;
}
@ -255,7 +255,7 @@ static int testFDStreamWriteCommon(const char *scratchdir, bool blocking)
want = PATTERN_LEN;
if (saferead(fd, buf, want) != want) {
fprintf(stderr, "Short read from data\n");
virFilePrintf(stderr, "Short read from data\n");
goto cleanup;
}
@ -263,22 +263,22 @@ static int testFDStreamWriteCommon(const char *scratchdir, bool blocking)
size_t j;
for (j = 0; j < (PATTERN_LEN / 2); j++) {
if (buf[j] != 0) {
fprintf(stderr, "Mismatched pattern data iteration %zu\n", i);
virFilePrintf(stderr, "Mismatched pattern data iteration %zu\n", i);
goto cleanup;
}
}
if (memcmp(buf + (PATTERN_LEN / 2), pattern, PATTERN_LEN / 2) != 0) {
fprintf(stderr, "Mismatched pattern data iteration %zu\n", i);
virFilePrintf(stderr, "Mismatched pattern data iteration %zu\n", i);
goto cleanup;
}
} else if (i == 9) {
if (memcmp(buf, pattern, PATTERN_LEN / 2) != 0) {
fprintf(stderr, "Mismatched pattern data iteration %zu\n", i);
virFilePrintf(stderr, "Mismatched pattern data iteration %zu\n", i);
goto cleanup;
}
} else {
if (memcmp(buf, pattern, PATTERN_LEN) != 0) {
fprintf(stderr, "Mismatched pattern data iteration %zu\n", i);
virFilePrintf(stderr, "Mismatched pattern data iteration %zu\n", i);
goto cleanup;
}
}
@ -324,7 +324,7 @@ mymain(void)
virFDStreamSetIOHelper(iohelper);
if (!mkdtemp(scratchdir)) {
fprintf(stderr, "Cannot create fakesysfsdir");
virFilePrintf(stderr, "Cannot create fakesysfsdir");
abort();
}

34
tests/virstringtest.c
View File

@ -25,8 +25,8 @@
#include "testutils.h"
#include "virerror.h"
#include "viralloc.h"
#include "virfile.h"
#include "virlog.h"
#include "virstring.h"
#define VIR_FROM_THIS VIR_FROM_NONE
@ -62,18 +62,18 @@ static int testSplit(const void *args)
tmp2 = data->tokens;
while (*tmp1 && *tmp2) {
if (STRNEQ(*tmp1, *tmp2)) {
fprintf(stderr, "Mismatch '%s' vs '%s'\n", *tmp1, *tmp2);
virFilePrintf(stderr, "Mismatch '%s' vs '%s'\n", *tmp1, *tmp2);
goto cleanup;
}
tmp1++;
tmp2++;
}
if (*tmp1) {
fprintf(stderr, "Too many pieces returned\n");
virFilePrintf(stderr, "Too many pieces returned\n");
goto cleanup;
}
if (*tmp2) {
fprintf(stderr, "Too few pieces returned\n");
virFilePrintf(stderr, "Too few pieces returned\n");
goto cleanup;
}
@ -96,7 +96,7 @@ static int testJoin(const void *args)
return -1;
}
if (STRNEQ(got, data->string)) {
fprintf(stderr, "Mismatch '%s' vs '%s'\n", got, data->string);
virFilePrintf(stderr, "Mismatch '%s' vs '%s'\n", got, data->string);
goto cleanup;
}
@ -143,49 +143,49 @@ testStrdup(const void *data ATTRIBUTE_UNUSED)
value = VIR_STRDUP(array[i++], testStrdupLookup1(j++));
if (value != 1) {
fprintf(stderr, "unexpected strdup result %d, expected 1\n", value);
virFilePrintf(stderr, "unexpected strdup result %d, expected 1\n", value);
goto cleanup;
}
if (i != 1) {
fprintf(stderr, "unexpected side effects i=%zu, expected 1\n", i);
virFilePrintf(stderr, "unexpected side effects i=%zu, expected 1\n", i);
goto cleanup;
}
if (j != 1) {
fprintf(stderr, "unexpected side effects j=%zu, expected 1\n", j);
virFilePrintf(stderr, "unexpected side effects j=%zu, expected 1\n", j);
goto cleanup;
}
if (STRNEQ_NULLABLE(array[0], "hello") || array[1]) {
fprintf(stderr, "incorrect array contents '%s' '%s'\n",
NULLSTR(array[0]), NULLSTR(array[1]));
virFilePrintf(stderr, "incorrect array contents '%s' '%s'\n",
NULLSTR(array[0]), NULLSTR(array[1]));
goto cleanup;
}
value = VIR_STRNDUP(array[i++], testStrdupLookup1(j++),
testStrdupLookup2(k++));
if (value != 0) {
fprintf(stderr, "unexpected strdup result %d, expected 0\n", value);
virFilePrintf(stderr, "unexpected strdup result %d, expected 0\n", value);
goto cleanup;
}
if (i != 2) {
fprintf(stderr, "unexpected side effects i=%zu, expected 2\n", i);
virFilePrintf(stderr, "unexpected side effects i=%zu, expected 2\n", i);
goto cleanup;
}
if (j != 2) {
fprintf(stderr, "unexpected side effects j=%zu, expected 2\n", j);
virFilePrintf(stderr, "unexpected side effects j=%zu, expected 2\n", j);
goto cleanup;
}
if (k != 1) {
fprintf(stderr, "unexpected side effects k=%zu, expected 1\n", k);
virFilePrintf(stderr, "unexpected side effects k=%zu, expected 1\n", k);
goto cleanup;
}
if (STRNEQ_NULLABLE(array[0], "hello") || array[1]) {
fprintf(stderr, "incorrect array contents '%s' '%s'\n",
NULLSTR(array[0]), NULLSTR(array[1]));
virFilePrintf(stderr, "incorrect array contents '%s' '%s'\n",
NULLSTR(array[0]), NULLSTR(array[1]));
goto cleanup;
}
if (fail) {
fprintf(stderr, "side effects failed\n");
virFilePrintf(stderr, "side effects failed\n");
goto cleanup;
}