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ECVT_R(3) Linux Programmer's Manual ECVT_R(3) NAME ecvt_r, fcvt_r, qecvt_r, qfcvt_r - convert a floating-point number to a string SYNOPSIS #include <stdlib.h> int ecvt_r(double number, int ndigits, int *restrict decpt, int *restrict sign, char *restrict buf, size_t len); int fcvt_r(double number, int ndigits, int *restrict decpt, int *restrict sign, char *restrict buf, size_t len); int qecvt_r(long double number, int ndigits, int *restrict decpt, int *restrict sign, char *restrict buf, size_t len); int qfcvt_r(long double number, int ndigits, int *restrict decpt, int *restrict sign, char *restrict buf, size_t len); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): ecvt_r(), fcvt_r(), qecvt_r(), qfcvt_r(): /* Glibc since 2.19: */ _DEFAULT_SOURCE || /* Glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE DESCRIPTION The functions ecvt_r(), fcvt_r(), qecvt_r(), and qfcvt_r() are identical to ecvt(3), fcvt(3), qecvt(3), and qfcvt(3), respectively, except that they do not reβ turn their result in a static buffer, but instead use the supplied buf of size len. See ecvt(3) and qecvt(3). RETURN VALUE These functions return 0 on success, and -1 otherwise. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬ββββββββββ βInterface β Attribute β Value β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββ€ βecvt_r(), fcvt_r(), qecvt_r(), qfcvt_r() β Thread safety β MT-Safe β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄ββββββββββ CONFORMING TO These functions are GNU extensions. NOTES These functions are obsolete. Instead, sprintf(3) is recommended. SEE ALSO ecvt(3), qecvt(3), sprintf(3) GNU 2021-03-22 ECVT_R(3)