| printf.3 (107619) | printf.3 (108037) |
|---|---|
| 1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek and the American National Standards Committee X3, 6.\" on Information Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without --- 20 unchanged lines hidden (view full) --- 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" @(#)printf.3 8.1 (Berkeley) 6/4/93 | 1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek and the American National Standards Committee X3, 6.\" on Information Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without --- 20 unchanged lines hidden (view full) --- 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" @(#)printf.3 8.1 (Berkeley) 6/4/93 |
| 37.\" $FreeBSD: head/lib/libc/stdio/printf.3 107619 2002-12-04 18:57:46Z ru $ | 37.\" $FreeBSD: head/lib/libc/stdio/printf.3 108037 2002-12-18 12:45:11Z ru $ |
| 38.\" 39.Dd November 8, 2001 40.Dt PRINTF 3 41.Os 42.Sh NAME 43.Nm printf , fprintf , sprintf , snprintf , asprintf , 44.Nm vprintf , vfprintf, vsprintf , vsnprintf , vasprintf 45.Nd formatted output conversion --- 23 unchanged lines hidden (view full) --- 69.Ft int 70.Fn vasprintf "char **ret" "const char *format" "va_list ap" 71.Sh DESCRIPTION 72The 73.Fn printf 74family of functions produces output according to a 75.Fa format 76as described below. | 38.\" 39.Dd November 8, 2001 40.Dt PRINTF 3 41.Os 42.Sh NAME 43.Nm printf , fprintf , sprintf , snprintf , asprintf , 44.Nm vprintf , vfprintf, vsprintf , vsnprintf , vasprintf 45.Nd formatted output conversion --- 23 unchanged lines hidden (view full) --- 69.Ft int 70.Fn vasprintf "char **ret" "const char *format" "va_list ap" 71.Sh DESCRIPTION 72The 73.Fn printf 74family of functions produces output according to a 75.Fa format 76as described below. |
| 77.Fn Printf | 77The 78.Fn printf |
| 78and 79.Fn vprintf | 79and 80.Fn vprintf |
| 81functions |
|
| 80write output to 81.Dv stdout , 82the standard output stream; 83.Fn fprintf 84and 85.Fn vfprintf 86write output to the given output 87.Fa stream ; --- 27 unchanged lines hidden (view full) --- 115and 116.Fn vsnprintf , 117which return the number of characters that would have been printed if the 118.Fa size 119were unlimited 120(again, not including the final 121.Ql \e0 ) . 122.Pp | 82write output to 83.Dv stdout , 84the standard output stream; 85.Fn fprintf 86and 87.Fn vfprintf 88write output to the given output 89.Fa stream ; --- 27 unchanged lines hidden (view full) --- 117and 118.Fn vsnprintf , 119which return the number of characters that would have been printed if the 120.Fa size 121were unlimited 122(again, not including the final 123.Ql \e0 ) . 124.Pp |
| 123.Fn Asprintf | 125The 126.Fn asprintf |
| 124and 125.Fn vasprintf | 127and 128.Fn vasprintf |
| 129functions |
|
| 126set 127.Fa *ret 128to be a pointer to a buffer sufficiently large to hold the formatted string. 129This pointer should be passed to 130.Xr free 3 131to release the allocated storage when it is no longer needed. 132If sufficient space cannot be allocated, 133.Fn asprintf 134and 135.Fn vasprintf 136will return \-1 and set 137.Fa ret 138to be a 139.Dv NULL 140pointer. 141.Pp | 130set 131.Fa *ret 132to be a pointer to a buffer sufficiently large to hold the formatted string. 133This pointer should be passed to 134.Xr free 3 135to release the allocated storage when it is no longer needed. 136If sufficient space cannot be allocated, 137.Fn asprintf 138and 139.Fn vasprintf 140will return \-1 and set 141.Fa ret 142to be a 143.Dv NULL 144pointer. 145.Pp |
| 142.Fn Snprintf | 146The 147.Fn snprintf |
| 143and 144.Fn vsnprintf | 148and 149.Fn vsnprintf |
| 150functions |
|
| 145will write at most 146.Fa size Ns \-1 147of the characters printed into the output string 148(the 149.Fa size Ns 'th 150character then gets the terminating 151.Ql \e0 ) ; 152if the return value is greater than or equal to the 153.Fa size 154argument, the string was too short 155and some of the printed characters were discarded. 156The output is always null-terminated. 157.Pp | 151will write at most 152.Fa size Ns \-1 153of the characters printed into the output string 154(the 155.Fa size Ns 'th 156character then gets the terminating 157.Ql \e0 ) ; 158if the return value is greater than or equal to the 159.Fa size 160argument, the string was too short 161and some of the printed characters were discarded. 162The output is always null-terminated. 163.Pp |
| 158.Fn Sprintf | 164The 165.Fn sprintf |
| 159and 160.Fn vsprintf | 166and 167.Fn vsprintf |
| 168functions |
|
| 161effectively assume an infinite 162.Fa size . 163.Pp 164The format string is composed of zero or more directives: 165ordinary 166.\" multibyte 167characters (not 168.Cm % ) , --- 686 unchanged lines hidden --- | 169effectively assume an infinite 170.Fa size . 171.Pp 172The format string is composed of zero or more directives: 173ordinary 174.\" multibyte 175characters (not 176.Cm % ) , --- 686 unchanged lines hidden --- |