contrib/libarchive-1.3.1/libarchive/archive_string_sprintf.c

   1 /*-
   2  * Copyright (c) 2003-2004 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  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "archive_platform.h"
  28 __FBSDID("$FreeBSD: src/lib/libarchive/archive_string_sprintf.c,v 1.7 2005/01/16 22:13:51 kientzle Exp $");
  29
  30 /*
  31  * The use of printf()-family functions can be troublesome
  32  * for space-constrained applications.  In addition, correctly
  33  * implementing this function in terms of vsnprintf() requires
  34  * two calls (one to determine the size, another to format the
  35  * result), which in turn requires duplicating the argument list
  36  * using va_copy, which isn't yet universally available.
  37  *
  38  * So, I've implemented a bare minimum of printf()-like capability
  39  * here.  This is only used to format error messages, so doesn't
  40  * require any floating-point support or field-width handling.
  41  */
  42
  43 #include <stdio.h>
  44
  45 #include "archive_string.h"
  46
  47 /*
  48  * Like 'vsprintf', but ensures the target is big enough, resizing if
  49  * necessary.
  50  */
  51 void
  52 __archive_string_vsprintf(struct archive_string *as, const char *fmt,
  53     va_list ap)
  54 {
  55         char long_flag;
  56         intmax_t s; /* Signed integer temp. */
  57         uintmax_t u; /* Unsigned integer temp. */
  58         const char *p, *p2;
  59
  60         __archive_string_ensure(as, 64);
  61
  62         if (fmt == NULL) {
  63                 as->s[0] = 0;
  64                 return;
  65         }
  66
  67         long_flag = '\0';
  68         for (p = fmt; *p != '\0'; p++) {
  69                 const char *saved_p = p;
  70
  71                 if (*p != '%') {
  72                         archive_strappend_char(as, *p);
  73                         continue;
  74                 }
  75
  76                 p++;
  77
  78                 switch(*p) {
  79                 case 'j':
  80                         long_flag = 'j';
  81                         p++;
  82                         break;
  83                 case 'l':
  84                         long_flag = 'l';
  85                         p++;
  86                         break;
  87                 }
  88
  89                 switch (*p) {
  90                 case '%':
  91                         __archive_strappend_char(as, '%');
  92                         break;
  93                 case 'c':
  94                         s = va_arg(ap, int);
  95                         __archive_strappend_char(as, s);
  96                         break;
  97                 case 'd':
  98                         switch(long_flag) {
  99                         case 'j': s = va_arg(ap, intmax_t); break;
 100                         case 'l': s = va_arg(ap, long); break;
 101                         default:  s = va_arg(ap, int); break;
 102                         }
 103                         archive_strappend_int(as, s, 10);
 104                         break;
 105                 case 's':
 106                         p2 = va_arg(ap, char *);
 107                         archive_strcat(as, p2);
 108                         break;
 109                 case 'o': case 'u': case 'x': case 'X':
 110                         /* Common handling for unsigned integer formats. */
 111                         switch(long_flag) {
 112                         case 'j': u = va_arg(ap, uintmax_t); break;
 113                         case 'l': u = va_arg(ap, unsigned long); break;
 114                         default:  u = va_arg(ap, unsigned int); break;
 115                         }
 116                         /* Format it in the correct base. */
 117                         switch (*p) {
 118                         case 'o': archive_strappend_int(as, u, 8); break;
 119                         case 'u': archive_strappend_int(as, u, 10); break;
 120                         default: archive_strappend_int(as, u, 16); break;
 121                         }
 122                         break;
 123                 default:
 124                         /* Rewind and print the initial '%' literally. */
 125                         p = saved_p;
 126                         archive_strappend_char(as, *p);
 127                 }
 128         }
 129 }