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fmt_double(3) [debian man page]

fmt_double(3)						     Library Functions Manual						     fmt_double(3)

NAME
fmt_double - write an ASCII representation of a double SYNTAX
#include <fmt.h> size_t fmt_double(char *dest,double d,size_t maxlen,size_t prec); DESCRIPTION
fmt_double writes an ASCII representation ('0' to '9', base 10) of d to dest and returns the number of bytes written. No more than maxlen bytes will be written. prec digits will be written, using scientific notation if necessary. fmt_double does not append . If dest equals FMT_LEN (i.e. is zero), fmt_double returns the number of bytes it would have written. SEE ALSO
scan_double(3) fmt_double(3)

Check Out this Related Man Page

WCSTOMBS(3)						     Linux Programmer's Manual						       WCSTOMBS(3)

NAME
wcstombs - convert a wide-character string to a multibyte string SYNOPSIS
#include <stdlib.h> size_t wcstombs(char *dest, const wchar_t *src, size_t n); DESCRIPTION
If dest is not a NULL pointer, the wcstombs() function converts the wide-character string src to a multibyte string starting at dest. At most n bytes are written to dest. The conversion starts in the initial state. The conversion can stop for three reasons: 1. A wide character has been encountered that can not be represented as a multibyte sequence (according to the current locale). In this case (size_t) -1 is returned. 2. The length limit forces a stop. In this case the number of bytes written to dest is returned, but the shift state at this point is lost. 3. The wide-character string has been completely converted, including the terminating null wide character (L''). In this case the con- version ends in the initial state. The number of bytes written to dest, excluding the terminating null byte (''), is returned. The programmer must ensure that there is room for at least n bytes at dest. If dest is NULL, n is ignored, and the conversion proceeds as above, except that the converted bytes are not written out to memory, and that no length limit exists. In order to avoid the case 2 above, the programmer should make sure n is greater or equal to wcstombs(NULL,src,0)+1. RETURN VALUE
The wcstombs() function returns the number of bytes that make up the converted part of multibyte sequence, not including the terminating null byte. If a wide character was encountered which could not be converted, (size_t) -1 is returned. CONFORMING TO
C99. NOTES
The behavior of wcstombs() depends on the LC_CTYPE category of the current locale. The function wcsrtombs(3) provides a thread safe interface to the same functionality. SEE ALSO
mbstowcs(3), wcsrtombs(3) COLOPHON
This page is part of release 3.44 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/. GNU
2011-10-16 WCSTOMBS(3)
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