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 1.10 2008/03/14 22:00:09 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. <sigh> 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 * Utility functions to format signed/unsigned integers and append 49 * them to an archive_string. 50 */ 51 static void 52 append_uint(struct archive_string *as, uintmax_t d, unsigned base) 53 { 54 static const char *digits = "0123456789abcdef"; 55 if (d >= base) 56 append_uint(as, d/base, base); 57 archive_strappend_char(as, digits[d % base]); 58 } 59 60 static void 61 append_int(struct archive_string *as, intmax_t d, unsigned base) 62 { 63 if (d < 0) { 64 archive_strappend_char(as, '-'); 65 d = -d; 66 } 67 append_uint(as, d, base); 68 } 69 70 71 void 72 __archive_string_sprintf(struct archive_string *as, const char *fmt, ...) 73 { 74 va_list ap; 75 76 va_start(ap, fmt); 77 archive_string_vsprintf(as, fmt, ap); 78 va_end(ap); 79 } 80 81 /* 82 * Like 'vsprintf', but ensures the target is big enough, resizing if 83 * necessary. 84 */ 85 void 86 __archive_string_vsprintf(struct archive_string *as, const char *fmt, 87 va_list ap) 88 { 89 char long_flag; 90 intmax_t s; /* Signed integer temp. */ 91 uintmax_t u; /* Unsigned integer temp. */ 92 const char *p, *p2; 93 94 if (__archive_string_ensure(as, 64) == NULL) 95 __archive_errx(1, "Out of memory"); 96 97 if (fmt == NULL) { 98 as->s[0] = 0; 99 return; 100 } 101 102 for (p = fmt; *p != '\0'; p++) { 103 const char *saved_p = p; 104 105 if (*p != '%') { 106 archive_strappend_char(as, *p); 107 continue; 108 } 109 110 p++; 111 112 long_flag = '\0'; 113 switch(*p) { 114 case 'j': 115 long_flag = 'j'; 116 p++; 117 break; 118 case 'l': 119 long_flag = 'l'; 120 p++; 121 break; 122 } 123 124 switch (*p) { 125 case '%': 126 __archive_strappend_char(as, '%'); 127 break; 128 case 'c': 129 s = va_arg(ap, int); 130 __archive_strappend_char(as, s); 131 break; 132 case 'd': 133 switch(long_flag) { 134 case 'j': s = va_arg(ap, intmax_t); break; 135 case 'l': s = va_arg(ap, long); break; 136 default: s = va_arg(ap, int); break; 137 } 138 append_int(as, s, 10); 139 break; 140 case 's': 141 p2 = va_arg(ap, char *); 142 archive_strcat(as, p2); 143 break; 144 case 'o': case 'u': case 'x': case 'X': 145 /* Common handling for unsigned integer formats. */ 146 switch(long_flag) { 147 case 'j': u = va_arg(ap, uintmax_t); break; 148 case 'l': u = va_arg(ap, unsigned long); break; 149 default: u = va_arg(ap, unsigned int); break; 150 } 151 /* Format it in the correct base. */ 152 switch (*p) { 153 case 'o': append_uint(as, u, 8); break; 154 case 'u': append_uint(as, u, 10); break; 155 default: append_uint(as, u, 16); break; 156 } 157 break; 158 default: 159 /* Rewind and print the initial '%' literally. */ 160 p = saved_p; 161 archive_strappend_char(as, *p); 162 } 163 } 164 } 165