contrib/libarchive-2/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 1.9 2007/07/15 19:13:59 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 #include "archive_private.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         if (__archive_string_ensure(as, 64) == NULL)
  61                 __archive_errx(1, "Out of memory");
  62
  63         if (fmt == NULL) {
  64                 as->s[0] = 0;
  65                 return;
  66         }
  67
  68         long_flag = '\0';
  69         for (p = fmt; *p != '\0'; p++) {
  70                 const char *saved_p = p;
  71
  72                 if (*p != '%') {
  73                         archive_strappend_char(as, *p);
  74                         continue;
  75                 }
  76
  77                 p++;
  78
  79                 switch(*p) {
  80                 case 'j':
  81                         long_flag = 'j';
  82                         p++;
  83                         break;
  84                 case 'l':
  85                         long_flag = 'l';
  86                         p++;
  87                         break;
  88                 }
  89
  90                 switch (*p) {
  91                 case '%':
  92                         __archive_strappend_char(as, '%');
  93                         break;
  94                 case 'c':
  95                         s = va_arg(ap, int);
  96                         __archive_strappend_char(as, s);
  97                         break;
  98                 case 'd':
  99                         switch(long_flag) {
 100                         case 'j': s = va_arg(ap, intmax_t); break;
 101                         case 'l': s = va_arg(ap, long); break;
 102                         default:  s = va_arg(ap, int); break;
 103                         }
 104                         archive_strappend_int(as, s, 10);
 105                         break;
 106                 case 's':
 107                         p2 = va_arg(ap, char *);
 108                         archive_strcat(as, p2);
 109                         break;
 110                 case 'o': case 'u': case 'x': case 'X':
 111                         /* Common handling for unsigned integer formats. */
 112                         switch(long_flag) {
 113                         case 'j': u = va_arg(ap, uintmax_t); break;
 114                         case 'l': u = va_arg(ap, unsigned long); break;
 115                         default:  u = va_arg(ap, unsigned int); break;
 116                         }
 117                         /* Format it in the correct base. */
 118                         switch (*p) {
 119                         case 'o': archive_strappend_int(as, u, 8); break;
 120                         case 'u': archive_strappend_int(as, u, 10); break;
 121                         default: archive_strappend_int(as, u, 16); break;
 122                         }
 123                         break;
 124                 default:
 125                         /* Rewind and print the initial '%' literally. */
 126                         p = saved_p;
 127                         archive_strappend_char(as, *p);
 128                 }
 129         }
 130 }