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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | NOTES | SEE ALSO | COLOPHON |
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ecvt_r(3) Library Functions Manual ecvt_r(3)
ecvt_r, fcvt_r, qecvt_r, qfcvt_r - convert a floating-point number
to a string
Standard C library (libc, -lc)
#include <stdlib.h>
[[deprecated]] int ecvt_r(double number, int ndigits,
int *restrict decpt, int *restrict sign,
char *restrict buf, size_t size);
[[deprecated]] int fcvt_r(double number, int ndigits,
int *restrict decpt, int *restrict sign,
char *restrict buf, size_t size);
[[deprecated]] int qecvt_r(long double number, int ndigits,
int *restrict decpt, int *restrict sign,
char *restrict buf, size_t size);
[[deprecated]] int qfcvt_r(long double number, int ndigits,
int *restrict decpt, int *restrict sign,
char *restrict buf, size_t size);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
ecvt_r(), fcvt_r(), qecvt_r(), qfcvt_r():
/* glibc >= 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
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 return their result in a
static buffer, but instead use the supplied buf of size size. See
ecvt(3) and qecvt(3).
These functions return 0 on success, and -1 otherwise.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ ecvt_r(), fcvt_r(), qecvt_r(), │ Thread safety │ MT-Safe │
│ qfcvt_r() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
GNU.
These functions are obsolete. Instead, sprintf(3) is recommended.
ecvt(3), qecvt(3), sprintf(3)
This page is part of the man-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 is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 ecvt_r(3)
Pages that refer to this page: ecvt(3), qecvt(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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