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Code Issues Releases Wiki Activity

Support non-standard vsnprintf() return code

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C99 states that vsnprintf() "returns the number of characters that
would have been printed if the n were unlimited"; but according to the
Linux manual page "glibc until 2.0.6 would return -1 when the output
was truncated" -- so we have to handle both cases ...
This commit is contained in:
Alexander Barton 2014-01-04 23:57:05 +01:00
parent 8872653ef6
commit 5d88030bd1
2 changed files with 33 additions and 5 deletions
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13
src/ngircd/conn.c
View File

@ -1,6 +1,6 @@
/*
* ngIRCd -- The Next Generation IRC Daemon
* Copyright (c)2001-2013 Alexander Barton (alex@barton.de) and Contributors.
* Copyright (c)2001-2014 Alexander Barton (alex@barton.de) and Contributors.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -984,6 +984,7 @@ va_dcl
size_t len;
bool ok;
va_list ap;
int r;
assert( Idx > NONE );
assert( Format != NULL );
@ -993,7 +994,8 @@ va_dcl
#else
va_start( ap );
#endif
if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
r = vsnprintf(buffer, COMMAND_LEN - 2, Format, ap);
if (r >= COMMAND_LEN - 2 || r == -1) {
/*
* The string that should be written to the socket is longer
* than the allowed size of COMMAND_LEN bytes (including both
@ -1014,6 +1016,13 @@ va_dcl
* an other server only routing the message!), so the only
* option left is to shorten the string and to hope that the
* result is still somewhat useful ...
*
* Note:
* C99 states that vsnprintf() "returns the number of characters
* that would have been printed if the n were unlimited"; but
* according to the Linux manual page "glibc until 2.0.6 would
* return -1 when the output was truncated" -- so we have to
* handle both cases ...
* -alex-
*/

25
src/portab/portabtest.c
View File

@ -139,16 +139,35 @@ va_dcl
{
char str[5];
va_list ap;
int r;
#ifdef PROTOTYPES
va_start(ap, Format);
#else
va_start(ap);
#endif
if (vsnprintf(str, sizeof(str), Format, ap) != Len)
Panic("vsnprintf return code");
r = vsnprintf(str, sizeof(str), Format, ap);
va_end(ap);
if (r != Len) {
/* C99 states that vsnprintf() "returns the number of
* characters that would have been printed if the n were
* unlimited", but according to the Linux manual page "glibc
* until 2.0.6 would return -1 when the output was truncated",
* and other implementations (libUTIL on A/UX) even return the
* number of characters processed ... so we only test our own
* implementation and warn on errors otherwise :-/ */
#ifdef HAVE_VSNPRINTF
fprintf(stderr,
"\n ** WARNING: The vsnprintf() function of this system isn't standard\n");
fprintf(stderr,
" ** conformant and returns a WRONG result: %d (should be %d)! The test\n",
r, Len);
fprintf(stderr,
" ** result has been ignored but may lead to errors during execution!\n\n");
#else
Panic("vsnprintf return code");
#endif
}
if (str[4] != '\0')
Panic("vsnprintf NULL byte");
if (strlen(str) != 4)