05-15-2008
According to POSIX.1-2001:
"The snprintf() function shall be equivalent to sprintf(), with the addition of the n argument which states the size of the buffer referred to by s. If n is zero, nothing shall be written and s may be a null pointer. Otherwise, output bytes beyond the n-1st shall be discarded instead of being written to the array, and a null byte is written at the end of the bytes actually written into the array."
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Following is not the real issue. The issue is with popen.
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GCVT(3) Linux Programmer's Manual GCVT(3)
NAME
gcvt - convert a floating-point number to a string
SYNOPSIS
#include <stdlib.h>
char *gcvt(double number, size_t ndigit, char *buf);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
gcvt(): _SVID_SOURCE || _XOPEN_SOURCE >= 500
DESCRIPTION
The gcvt() function converts number to a minimal length null-terminated ASCII string and stores the result in buf. It produces ndigit sig-
nificant digits in either printf(3) F format or E format.
RETURN VALUE
The gcvt() function returns the address of the string pointed to by buf.
CONFORMING TO
Marked as LEGACY in POSIX.1-2001. POSIX.1-2008 removes the specification of gcvt(), recommending the use of sprintf(3) instead (though
snprintf(3) may be preferable).
SEE ALSO
ecvt(3), fcvt(3), sprintf(3)
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2009-03-15 GCVT(3)