| @node snprintf |
| @section @code{snprintf} |
| @findex snprintf |
| |
| POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/snprintf.html} |
| |
| Gnulib module: snprintf or snprintf-posix |
| |
| Portability problems fixed by either Gnulib module @code{snprintf} or @code{snprintf-posix}: |
| @itemize |
| @item |
| This function is missing on some platforms: |
| MSVC 14. |
| @item |
| This function does not support format directives that access arguments in an |
| arbitrary order, such as @code{"%2$s"}, on some platforms: |
| NetBSD 3.0, mingw. |
| @item |
| This function does not return a byte count as specified in C99 on some |
| platforms: |
| HP-UX 11, IRIX 6.5, Solaris 9, mingw. |
| @end itemize |
| |
| Portability problems fixed by Gnulib module @code{snprintf-posix}: |
| @itemize |
| @item |
| This function does not support size specifiers as in C99 (@code{hh}, @code{ll}, |
| @code{j}, @code{t}, @code{z}) on some platforms: |
| AIX 5.1, HP-UX 11.23, IRIX 6.5, Solaris 9, Cygwin 1.5.24, mingw, MSVC 14. |
| @item |
| printf of @samp{long double} numbers is unsupported on some platforms: |
| mingw, MSVC 14. |
| @item |
| printf @code{"%f"}, @code{"%e"}, @code{"%g"} of Infinity and NaN yields an |
| incorrect result on some platforms: |
| AIX 5.2, Solaris 11.4, mingw, MSVC 14. |
| @item |
| This function does not support the @samp{a} and @samp{A} directives on some |
| platforms: |
| glibc-2.3.6, Mac OS X 10.5, NetBSD 5.0, OpenBSD 4.0, AIX 5.2, HP-UX 11, |
| IRIX 6.5, Solaris 11.4, Cygwin 1.5.x, mingw, MSVC 14. |
| @item |
| This function does not support the @samp{F} directive on some platforms: |
| NetBSD 3.0, AIX 5.1, HP-UX 11.23, IRIX 6.5, Solaris 9, |
| Cygwin 1.5.x, mingw, MSVC 14. |
| @item |
| This function does not support the @samp{n} directive on some platforms: |
| glibc when used with @code{_FORTIFY_SOURCE >= 2} (set by default on Ubuntu), |
| MSVC 14. |
| @item |
| This function does not support the @samp{ls} directive on some platforms: |
| OpenBSD 4.0, IRIX 6.5, Cygwin 1.5.x, Haiku. |
| @item |
| This function does not support precisions in the @samp{ls} directive correctly |
| on some platforms: |
| Solaris 11.4. |
| @item |
| This function doesn't support the @code{'} flag on some platforms: |
| NetBSD 3.0, Cygwin 1.5.24, mingw, MSVC 14. |
| @item |
| This function does not round the argument of the @samp{a} directive correctly |
| on some platforms: |
| Mac OS X 10.12, FreeBSD 6.1. |
| @item |
| printf @code{"%010f"} of NaN and Infinity yields an incorrect result (padded |
| with zeroes, or wrong capitalization) on some platforms: |
| Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, AIX 5.2, IRIX 6.5, Solaris 11.4, Cygwin 1.5.x, mingw, MSVC 14. |
| @item |
| This function does not support precisions larger than 512 or 1024 in integer, |
| floating-point and pointer output on some platforms: |
| AIX 7.1, Solaris 10/x86, mingw, MSVC 14. |
| @item |
| This function mishandles large floating point precisions |
| (for example, formatting 1.0 with @samp{"%.511f"}) |
| on some platforms: |
| Solaris 10. |
| @item |
| This function can crash in out-of-memory conditions on some platforms: |
| FreeBSD 6.0, NetBSD 5.0. |
| @item |
| This function does not truncate the result as specified in C99 on some platforms: |
| mingw, MSVC 14. |
| @item |
| This function does not fully support the @samp{n} directive on some platforms: |
| HP-UX 11, mingw, MSVC 14. |
| @end itemize |
| |
| Portability problems not fixed by Gnulib: |
| @itemize |
| @item |
| The @code{%m} directive is not portable, use @code{%s} mapped to an |
| argument of @code{strerror(errno)} (or a version of @code{strerror_r}) |
| instead. |
| @item |
| Formatting noncanonical @samp{long double} numbers produces |
| nonmeaningful results on some platforms: |
| glibc and others, on x86, x86_64, IA-64 CPUs. |
| @item |
| When formatting an integer with grouping flag, this function inserts thousands |
| separators even in the "C" locale on some platforms: |
| NetBSD 5.1. |
| @end itemize |