contrib/libarchive-2.1/libarchive/archive_string_sprintf.c

   1 /*-
   2  * Copyright (c) 2003-2007 Tim Kientzle
   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(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "archive_platform.h"
  27 __FBSDID("$FreeBSD: src/lib/libarchive/archive_string_sprintf.c,v 1.8 2007/01/09 08:05:55 kientzle Exp $");
  28
  29 /*
  30  * The use of printf()-family functions can be troublesome
  31  * for space-constrained applications.  In addition, correctly
  32  * implementing this function in terms of vsnprintf() requires
  33  * two calls (one to determine the size, another to format the
  34  * result), which in turn requires duplicating the argument list
  35  * using va_copy, which isn't yet universally available.
  36  *
  37  * So, I've implemented a bare minimum of printf()-like capability
  38  * here.  This is only used to format error messages, so doesn't
  39  * require any floating-point support or field-width handling.
  40  */
  41
  42 #include <stdio.h>
  43
  44 #include "archive_string.h"
  45
  46 /*
  47  * Like 'vsprintf', but ensures the target is big enough, resizing if
  48  * necessary.
  49  */
  50 void
  51 __archive_string_vsprintf(struct archive_string *as, const char *fmt,
  52     va_list ap)
  53 {
  54         char long_flag;
  55         intmax_t s; /* Signed integer temp. */
  56         uintmax_t u; /* Unsigned integer temp. */
  57         const char *p, *p2;
  58
  59         __archive_string_ensure(as, 64);
  60
  61         if (fmt == NULL) {
  62                 as->s[0] = 0;
  63                 return;
  64         }
  65
  66         long_flag = '\0';
  67         for (p = fmt; *p != '\0'; p++) {
  68                 const char *saved_p = p;
  69
  70                 if (*p != '%') {
  71                         archive_strappend_char(as, *p);
  72                         continue;
  73                 }
  74
  75                 p++;
  76
  77                 switch(*p) {
  78                 case 'j':
  79                         long_flag = 'j';
  80                         p++;
  81                         break;
  82                 case 'l':
  83                         long_flag = 'l';
  84                         p++;
  85                         break;
  86                 }
  87
  88                 switch (*p) {
  89                 case '%':
  90                         __archive_strappend_char(as, '%');
  91                         break;
  92                 case 'c':
  93                         s = va_arg(ap, int);
  94                         __archive_strappend_char(as, s);
  95                         break;
  96                 case 'd':
  97                         switch(long_flag) {
  98                         case 'j': s = va_arg(ap, intmax_t); break;
  99                         case 'l': s = va_arg(ap, long); break;
 100                         default:  s = va_arg(ap, int); break;
 101                         }
 102                         archive_strappend_int(as, s, 10);
 103                         break;
 104                 case 's':
 105                         p2 = va_arg(ap, char *);
 106                         archive_strcat(as, p2);
 107                         break;
 108                 case 'o': case 'u': case 'x': case 'X':
 109                         /* Common handling for unsigned integer formats. */
 110                         switch(long_flag) {
 111                         case 'j': u = va_arg(ap, uintmax_t); break;
 112                         case 'l': u = va_arg(ap, unsigned long); break;
 113                         default:  u = va_arg(ap, unsigned int); break;
 114                         }
 115                         /* Format it in the correct base. */
 116                         switch (*p) {
 117                         case 'o': archive_strappend_int(as, u, 8); break;
 118                         case 'u': archive_strappend_int(as, u, 10); break;
 119                         default: archive_strappend_int(as, u, 16); break;
 120                         }
 121                         break;
 122                 default:
 123                         /* Rewind and print the initial '%' literally. */
 124                         p = saved_p;
 125                         archive_strappend_char(as, *p);
 126                 }
 127         }
 128 }