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ecvt_r(3) — Linux manual page

ecvt_r(3)                Library Functions Manualecvt_r(3)

NAME        top

       ecvt_r, fcvt_r, qecvt_r, qfcvt_r - convert a floating-point number       to a string

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <stdlib.h>[[deprecated]] int ecvt_r(doublenumber, intndigits,int *restrictdecpt, int *restrictsign,char *restrictbuf, size_tsize);[[deprecated]] int fcvt_r(doublenumber, intndigits,int *restrictdecpt, int *restrictsign,char *restrictbuf, size_tsize);[[deprecated]] int qecvt_r(long doublenumber, intndigits,int *restrictdecpt, int *restrictsign,char *restrictbuf, size_tsize);[[deprecated]] int qfcvt_r(long doublenumber, intndigits,int *restrictdecpt, int *restrictsign,char *restrictbuf, size_tsize);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):ecvt_r(),fcvt_r(),qecvt_r(),qfcvt_r():           /* glibc >= 2.19: */ _DEFAULT_SOURCE               || /* glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE

DESCRIPTION        top

       The functionsecvt_r(),fcvt_r(),qecvt_r(), andqfcvt_r() are       identical toecvt(3),fcvt(3),qecvt(3), andqfcvt(3),       respectively, except that they do not return their result in a       static buffer, but instead use the suppliedbuf of sizesize.  Seeecvt(3) andqecvt(3).

RETURN VALUE        top

       These functions return 0 on success, and -1 otherwise.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │ecvt_r(),fcvt_r(),qecvt_r(),       │ Thread safety │ MT-Safe │       │qfcvt_r()                            │               │         │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS        top

       GNU.

NOTES        top

       These functions are obsolete.  Instead,sprintf(3) is recommended.

SEE ALSO        top

ecvt(3),qecvt(3),sprintf(3)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17ecvt_r(3)

Pages that refer to this page:ecvt(3), qecvt(3)

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