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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LEARN ABOUT MINIX
strfromd
STRFROMD(3) Linux Programmer's Manual STRFROMD(3)
NAME
strfromd, strfromf, strfroml - convert a floating-point value into a string
SYNOPSIS
#include <stdlib.h>
int strfromd(char *restrict str, size_t n,
const char *restrict format, double fp);
int strfromf(char *restrict str, size_t n,
const char *restrict format, float fp);
int strfroml(char *restrict str, size_t n,
const char *restrict format, long double fp);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
strfromd(), strfromf(), strfroml():
__STDC_WANT_IEC_60559_BFP_EXT__
DESCRIPTION
These functions convert a floating-point value, fp, into a string of characters, str, with a configurable format string. At most n charac-
ters are stored into str.
The terminating null character ('