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vasprintf: Pass a 1-character buffer to initial vsnprintf call.

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GNO vsnprintf will give an error if size is 0, leading vasprintf to fail. This prevented sending data in telnetd.
This commit is contained in:
Stephen Heumann 2015-06-03 20:38:31 -05:00
parent 7968e76e4a
commit 98b485d83b
1 changed files with 2 additions and 1 deletions
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3
libtelnet/vasprintf.c
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@ -44,9 +44,10 @@ vasprintf(char **strp, const char *fmt, va_list ap)
{ {
va_list aq; va_list aq;
int ret; int ret;
char c;
va_copy(aq, ap); va_copy(aq, ap);
ret = vsnprintf(NULL, 0, fmt, ap); ret = vsnprintf(&c, 1, fmt, ap);
/* va_end(ap); -- Don't do this on ORCA/C; it messes up the stack */ /* va_end(ap); -- Don't do this on ORCA/C; it messes up the stack */
if ((*strp = malloc(ret + 1)) == NULL) if ((*strp = malloc(ret + 1)) == NULL)
return (-1); return (-1);