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mprintf: allow %.s with data not being zero terminated

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If the precision is indeed shorter than the string, don't strlen() to
find the end because that's not how the precision operator works.

I also added a unit test for curl_msnprintf to make sure this works and
that the fix doesn't a few other basic use cases. I found a POSIX
compliance problem that I marked TODO in the unit test, and I figure we
need to add more tests in the future.

Reported-by: Török Edwin
This commit is contained in:
Daniel Stenberg 2014-05-04 23:37:24 +02:00
parent 312f36d453
commit 812da4190f
4 changed files with 126 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
lib/mprintf.c
View File

@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1999 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1999 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -804,11 +804,11 @@ static int dprintf_formatf(
len = 0;
}
}
else if(prec != -1)
len = (size_t)prec;
else
len = strlen(str);
if(prec != -1 && (size_t) prec < len)
len = (size_t)prec;
width -= (long)len;
if(p->flags & FLAGS_ALT)
@ -818,7 +818,7 @@ static int dprintf_formatf(
while(width-- > 0)
OUTCHAR(' ');
while(len-- > 0)
while((len-- > 0) && *str)
OUTCHAR(*str++);
if(p->flags&FLAGS_LEFT)
while(width-- > 0)

26
tests/data/test1398 Normal file
View File

@ -0,0 +1,26 @@
<testcase>
<info>
<keywords>
unittest
curl_msnprintf
</keywords>
</info>
#
# Client-side
<client>
<server>
none
</server>
<features>
unittest
</features>
<name>
curl_msnprintf unit tests
</name>
<tool>
unit1398
</tool>
</client>
</testcase>

6
tests/unit/Makefile.inc
View File

@ -6,7 +6,7 @@ UNITFILES = curlcheck.h \
# These are all unit test programs
UNITPROGS = unit1300 unit1301 unit1302 unit1303 unit1304 unit1305 unit1307 \
unit1308 unit1309 unit1330 unit1394 unit1395 unit1396 unit1397
unit1308 unit1309 unit1330 unit1394 unit1395 unit1396 unit1397 unit1398
unit1300_SOURCES = unit1300.c $(UNITFILES)
unit1300_CPPFLAGS = $(AM_CPPFLAGS)
@ -52,3 +52,7 @@ unit1396_CPPFLAGS = $(AM_CPPFLAGS)
unit1397_SOURCES = unit1397.c $(UNITFILES)
unit1397_CPPFLAGS = $(AM_CPPFLAGS)
unit1398_SOURCES = unit1398.c $(UNITFILES)
unit1398_CPPFLAGS = $(AM_CPPFLAGS)

91
tests/unit/unit1398.c Normal file
View File

@ -0,0 +1,91 @@
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curlcheck.h"
#include "curl/mprintf.h"
static CURLcode unit_setup( void ) {return CURLE_OK;}
static void unit_stop( void ) {}
UNITTEST_START
int rc;
char buf[3] = {'b', 'u', 'g'};
const char *str="bug";
int width = 3;
char output[24];
/*#define curl_msnprintf snprintf */
/* without a trailing zero */
rc = curl_msnprintf(output, 4, "%.*s", width, buf);
fail_unless( rc == 3 , "return code should be 3" );
fail_unless(!strcmp(output, "bug"), "wrong output");
/* with a trailing zero */
rc = curl_msnprintf(output, 4, "%.*s", width, str);
fail_unless( rc == 3 , "return code should be 3" );
fail_unless(!strcmp(output, "bug"), "wrong output");
width = 2;
/* one byte less */
rc = curl_msnprintf(output, 4, "%.*s", width, buf);
fail_unless( rc == 2 , "return code should be 2" );
fail_unless(!strcmp(output, "bu"), "wrong output");
/* string with larger precision */
rc = curl_msnprintf(output, 8, "%.8s", str);
fail_unless( rc == 3 , "return code should be 3" );
fail_unless(!strcmp(output, "bug"), "wrong output");
/* longer string with precision */
rc = curl_msnprintf(output, 8, "%.3s", "0123456789");
fail_unless( rc == 3 , "return code should be 3" );
fail_unless(!strcmp(output, "012"), "wrong output");
/* negative width */
rc = curl_msnprintf(output, 8, "%-8s", str);
fail_unless( rc == 8 , "return code should be 8" );
fail_unless(!strcmp(output, "bug "), "wrong output");
/* larger width that string length */
rc = curl_msnprintf(output, 8, "%8s", str);
fail_unless( rc == 8 , "return code should be 8" );
fail_unless(!strcmp(output, " bu"), "wrong output");
/* output a number in a limited output */
rc = curl_msnprintf(output, 4, "%d", 10240);
/* TODO: this should return 5 to be POSIX/snprintf compliant! */
fail_unless( rc == 4 , "return code should be 4" );
fail_unless(!strcmp(output, "102"), "wrong output");
/* padded strings */
rc = curl_msnprintf(output, 16, "%8s%8s", str, str);
fail_unless( rc == 16 , "return code should be 16" );
fail_unless(!strcmp(output, " bug bu"), "wrong output");
/* padded numbers */
rc = curl_msnprintf(output, 16, "%8d%8d", 1234, 5678);
fail_unless( rc == 16 , "return code should be 16" );
fail_unless(!strcmp(output, " 1234 567"), "wrong output");
UNITTEST_STOP