lib/libc/stdio/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 "un-namespace.h"
  39 #include "printf.h"
  40
  41 int
  42 __printf_arginfo_quote(const struct printf_info *pi __unused, size_t n,
  43                        int *argt)
  44 {
  45
  46         assert(n >= 1);
  47         argt[0] = PA_POINTER;
  48         return (1);
  49 }
  50
  51 int
  52 __printf_render_quote(struct __printf_io *io,
  53                       const struct printf_info *pi __unused,
  54                       const void *const *arg)
  55 {
  56         const char *str, *p, *t, *o;
  57         char r[5];
  58         int i, ret;
  59
  60         str = *((const char *const *)arg[0]);
  61         if (str == NULL)
  62                 return (__printf_out(io, pi, "\"(null)\"", 8));
  63         if (*str == '\0')
  64                 return (__printf_out(io, pi, "\"\"", 2));
  65
  66         for (i = 0, p = str; *p; p++)
  67                 if (isspace(*p) || *p == '\\' || *p == '"')
  68                         i++;
  69         if (!i)
  70                 return (__printf_out(io, pi, str, strlen(str)));
  71
  72         ret = __printf_out(io, pi, "\"", 1);
  73         for (t = p = str; *p; p++) {
  74                 o = NULL;
  75                 if (*p == '\\')
  76                         o = "\\\\";
  77                 else if (*p == '\n')
  78                         o = "\\n";
  79                 else if (*p == '\r')
  80                         o = "\\r";
  81                 else if (*p == '\t')
  82                         o = "\\t";
  83                 else if (*p == ' ')
  84                         o = " ";
  85                 else if (*p == '"')
  86                         o = "\\\"";
  87                 else if (isspace(*p)) {
  88                         sprintf(r, "\\%03o", *p);
  89                         o = r;
  90                 } else {
  91                         continue;
  92                 }
  93                 if (p != t)
  94                         ret += __printf_out(io, pi, t, p - t);
  95                 ret += __printf_out(io, pi, o, strlen(o));
  96                 t = p + 1;
  97         }
  98         if (p != t)
  99                 ret += __printf_out(io, pi, t, p - t);
 100         ret += __printf_out(io, pi, "\"", 1);
 101         __printf_flush(io);
 102         return(ret);
 103 }