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freebsd/lib/libc/stdio/xprintf_vis.c
Poul-Henning Kamp 6dbacee284 Make the %V{is} extension handle a NULL pointer like %s does: output "(null)"
Add %M{essage} extension which prints an errno value as the
corresponding string if possible or numerically otherwise.

It is not currently possible to do the syslog(3) like %m extension
because errno would need to get capatured on entry to the first
function in the printf family, so %M requires you to supply errno
as an argument.

Add %Q{uote} extension which will print a string in double quotes with
appropriate back-slash escapes (only) if necessary.
2006-01-25 12:45:24 +00:00

79 lines
2.4 KiB
C

/*-
* Copyright (c) 2005 Poul-Henning Kamp
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <namespace.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <wchar.h>
#include <vis.h>
#include <assert.h>
#include <sys/time.h>
#include "printf.h"
int
__printf_arginfo_vis(const struct printf_info *pi, size_t n, int *argt)
{
assert(n >= 1);
argt[0] = PA_POINTER;
return (1);
}
int
__printf_render_vis(struct __printf_io *io, const struct printf_info *pi, const void *const *arg)
{
char *p, *buf;
unsigned l;
int ret;
ret = 0;
p = *((char **)arg[0]);
if (p == NULL)
return (__printf_out(io, pi, "(null)", 6));
if (pi->prec >= 0)
l = pi->prec;
else
l = strlen(p);
buf = malloc(l * 4 + 1);
if (buf == NULL)
return (-1);
if (pi->showsign)
ret = strvisx(buf, p, l, VIS_WHITE | VIS_HTTPSTYLE);
else if (pi->pad == '0')
ret = strvisx(buf, p, l, VIS_WHITE | VIS_OCTAL);
else if (pi->alt)
ret = strvisx(buf, p, l, VIS_WHITE);
else
ret = strvisx(buf, p, l, VIS_WHITE | VIS_CSTYLE | VIS_OCTAL);
ret += __printf_out(io, pi, buf, ret);
__printf_flush(io);
free(buf);
return(ret);
}