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Fix C99 error case handling (snprintf ret value >= buffer size).

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This commit is contained in:
Alasdair Kergon 2001-12-31 15:17:34 +00:00
parent 52f71ce77b
commit 6c94692bc6
1 changed files with 9 additions and 5 deletions
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14
lib/misc/lvm-string.h
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@ -10,19 +10,23 @@
#include <stdarg.h>
/*
* Different versions of glibc have different
* return values for over full buffers.
* On error, up to glibc 2.0.6, snprintf returned -1 if buffer was too small;
* From glibc 2.1 it returns number of chars (excl. trailing null) that would
* have been written had there been room.
*
* lvm_snprintf reverts to the old behaviour.
*/
static inline int lvm_snprintf(char *str, size_t size, const char *format, ...)
static inline int lvm_snprintf(char *buf, size_t bufsize,
const char *format, ...)
{
int n;
va_list ap;
va_start(ap, format);
n = vsnprintf(str, size, format, ap);
n = vsnprintf(buf, bufsize, format, ap);
va_end(ap);
if (n < 0 || (n == size))
if (n < 0 || (n > bufsize - 1))
return -1;
return n;