strprint.3

harvest是一个下载html网页得机器人

.\"(c) Copyright 1992, 1993 by Panagiotis Tsirigotis
.\"All rights reserved.  The file named COPYRIGHT specifies the terms 
.\"and conditions for redistribution.
.\"
.\" strprint.3,v 1.1.1.1 1994/04/26 19:08:12 hardy Exp
.TH STRPRINT 3X "30 September 1992"
.SH NAME
str_sprint, tr_sprintv, str_nprint, str_nprintv, str_print, str_printv, strx_sprint, strx_sprintv, strx_nprint, strx_nprintv, strx_print, strx_printv -- formatted conversion to string
.SH SYNOPSIS
.LP
.nf
.ft B
#include "str.h"
.LP
.ft B
char *str_sprint( buf, format, ... )
char *buf ;
char *format ;
.LP
.ft B
char *str_sprintv( buf, format, ap )
char *buf ;
char *format ;
va_list ap ;
.LP
.ft B
int str_nprint( buf, format, ... )
char *buf ;
char *format ;
.LP
.ft B
int str_nprintv( buf, format, ap )
char *buf ;
char *format ;
va_list ap ;
.LP
.ft B
void str_print( countp, buf, format, ... )
int *countp ;
char *buf ;
char *format ;
.LP
.ft B
void str_printv( countp, buf, format, ap )
int *countp ;
char *buf ;
char *format ;
va_list ap ;
.LP
.ft B
char *strx_sprint( buf, len, format, ... )
char *buf ;
int len ;
char *format ;
.LP
.ft B
char *strx_sprintv( buf, len, format, ap )
char *buf ;
int len ;
char *format ;
va_list ap ;
.LP
.ft B
int strx_nprint( buf, len, format, ... )
char *buf ;
int len ;
char *format ;
.LP
.ft B
int strx_nprintv( buf, len, format, ap )
char *buf ;
int len ;
char *format ;
va_list ap ;
.LP
.ft B
void strx_print( countp, buf, len, format, ... )
int *countp ;
char *buf ;
int len ;
char *format ;
.LP
.ft B
void strx_printv( countp, buf, len, format, ap )
int *countp ;
char *buf ;
int len ;
char *format ;
va_list ap ;
.SH DESCRIPTION
.LP
All functions are similar in functionality to \fIsprintf()\fR.
Their only difference is in their return values. For information about their
conversion capabilities, check \fISprint(3)\fR.
.LP
The difference between the \fIstr_*\fR and the \fIstrx_*\fR functions
is that the latter take an extra argument, the size of the buffer, so
that they will never write beyond the end of the buffer. Writing
beyond the end of the buffer is possible with the \fIstr_*\fR functions.
Invoking any of the \fIstrx_*\fR functions with the
.I len
argument set to 0
is the same as calling the equivalent \fIstr_*\fR function.
.LP
All functions will append a
.SM NUL
at the end of
.I buf
(the \fIstrx_*\fR functions will not do this if it would cause 
a buffer overrun).
.LP
.B str_print(),
.B str_printv(),
.B strx_print(),
and
.B strx_printv()
will put in
.I "*countp"
the number of characters placed in 
.I buf
excluding the ending
.SM NUL
(this happens only if
.I "*countp"
is not
.SM NULL
).
.LP
The functions that have a name ending in 'v' are similar to those without
the 'v' at the end of their name
except that instead of accepting a variable number of arguments, they
expect a \fIvarargs(3)\fR argument list.
.SH "RETURN VALUES"
.LP
.B str_sprint(),
.B str_sprintv(),
.B strx_sprint(),
and
.B strx_sprintv()
return
.I buf.
.LP
.B str_nprint(),
.B str_nprintv(),
.B strx_nprint(),
and
.B strx_nprintv()
return the number of characters placed in 
.I buf
excluding the ending
.SM NUL.
.SH "SEE ALSO"
Sprint(3)