stdio/FreeBSD/xprintf_quote.c

   1 /*-
   2  * Copyright (c) 2005 Poul-Henning Kamp
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/lib/libc/stdio/xprintf_quote.c,v 1.2 2006/03/02 08:53:45 phk Exp $
  27  */
  28
  29 #include <namespace.h>
  30 #include <stdio.h>
  31 #include <string.h>
  32 #include <stdlib.h>
  33 #include <ctype.h>
  34 #include <wchar.h>
  35 #include <vis.h>
  36 #include <assert.h>
  37 #include <sys/time.h>
  38 #include "printf.h"
  39 #include "xprintf_private.h"
  40
  41 __private_extern__ int
  42 __printf_arginfo_quote(const struct printf_info *pi __unused, size_t n, int *argt)
  43 {
  44
  45         assert(n >= 1);
  46         argt[0] = PA_POINTER;
  47         return (1);
  48 }
  49
  50 __private_extern__ int
  51 __printf_render_quote(struct __printf_io *io, const struct printf_info *pi __unused, const void *const *arg)
  52 {
  53         const char *str, *p, *t, *o;
  54         char r[5];
  55         int i, ret;
  56
  57         str = *((const char *const *)arg[0]);
  58         if (str == NULL)
  59                 return (__printf_out(io, pi, "\"(null)\"", 8));
  60         if (*str == '\0')
  61                 return (__printf_out(io, pi, "\"\"", 2));
  62
  63         for (i = 0, p = str; *p; p++)
  64                 if (isspace(*p) || *p == '\\' || *p == '"')
  65                         i++;
  66         if (!i)
  67                 return (__printf_out(io, pi, str, strlen(str)));
  68
  69         ret = __printf_out(io, pi, "\"", 1);
  70         for (t = p = str; *p; p++) {
  71                 o = NULL;
  72                 if (*p == '\\')
  73                         o = "\\\\";
  74                 else if (*p == '\n')
  75                         o = "\\n";
  76                 else if (*p == '\r')
  77                         o = "\\r";
  78                 else if (*p == '\t')
  79                         o = "\\t";
  80                 else if (*p == ' ')
  81                         o = " ";
  82                 else if (*p == '"')
  83                         o = "\\\"";
  84                 else if (isspace(*p)) {
  85                         sprintf(r, "\\%03o", *p);
  86                         o = r;
  87                 } else
  88                         continue;
  89                 if (p != t)
  90                         ret += __printf_out(io, pi, t, p - t);
  91                 ret += __printf_out(io, pi, o, strlen(o));
  92                 t = p + 1;
  93         }
  94         if (p != t)
  95                 ret += __printf_out(io, pi, t, p - t);
  96         ret += __printf_out(io, pi, "\"", 1);
  97         __printf_flush(io);
  98         return(ret);
  99 }