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revision 1.510 by akim, Fri Aug 17 14:54:15 2001 UTC revision 1.511 by eggert, Fri Aug 17 16:09:26 2001 UTC
# Line 3248  it, then you can use one of the general Line 3248  it, then you can use one of the general
3248  @end menu  @end menu
3249    
3250  @node Function Portability, Particular Functions, Library Functions, Library Functions  @node Function Portability, Particular Functions, Library Functions, Library Functions
3251  @subsection Portability of Classical Functions  @subsection Portability of C Functions
3252    
3253  Most usual functions can either be missing, or be buggy, or be limited  Most usual functions can either be missing, or be buggy, or be limited
3254  on some architectures.  This section tries to make an inventory of these  on some architectures.  This section tries to make an inventory of these
3255  portability issues.  By definition, this list will always require  portability issues.  By definition, this list will always require
3256  additions, please help us keeping it as complete as possible  additions.  Please help us keeping it as complete as possible.
3257    
3258  @table @asis  @table @asis
3259    @item @code{snprintf}
3260    @c @fuindex snprintf
3261    @prindex @code{snprintf}
3262    @c @fuindex vsnprintf
3263    @prindex @code{vsnprintf}
3264    The ISO C99 standard says that if the output array isn't big enough and
3265    if no other errors occur, @code{snprintf} and @code{vsnprintf} truncate
3266    the output and return the number of bytes that ought to have been
3267    produced.  Some older systems return the truncated length (e.g., GNU C
3268    Library 2.0.x or IRIX 6.5), some a negative value (e.g., earlier GNU C
3269    Library versions), and some the buffer length without truncation (e.g.,
3270    32-bit Solaris 7).  Also, some buggy older systems ignore the length and
3271    overrun the buffer (e.g., 64-bit Solaris 7).
3272    
3273  @item @code{sprintf}  @item @code{sprintf}
3274  @c @fuindex sprintf  @c @fuindex sprintf
3275  @prindex @code{sprintf}  @prindex @code{sprintf}
3276    @c @fuindex vsprintf
3277    @prindex @code{vsprintf}
3278  The ISO C standard says @code{sprintf} and @code{vsprintf} return the  The ISO C standard says @code{sprintf} and @code{vsprintf} return the
3279  number of characters written, but on some old systems (SunOS for  number of bytes written, but on some old systems (SunOS 4 for
3280  instance) they return the buffer pointer instead.  instance) they return the buffer pointer instead.
3281    
3282  @item @code{unlink}  @item @code{unlink}

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