1 /* $OpenBSD: dl_printf.c,v 1.21 2017/08/29 15:25:51 deraadt Exp $ */ 2 3 /*- 4 * Copyright (c) 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)printf.c 8.1 (Berkeley) 6/11/93 32 */ 33 34 /* 35 * Scaled down version of printf(3). 36 * 37 * One additional format: 38 * 39 * The format %b is supported to decode error registers. 40 * Its usage is: 41 * 42 * printf("reg=%b\n", regval, "<base><arg>*"); 43 * 44 * where <base> is the output base expressed as a control character, e.g. 45 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 46 * the first of which gives the bit number to be inspected (origin 1), and 47 * the next characters (up to a control character, i.e. a character <= 32), 48 * give the name of the register. Thus: 49 * 50 * printf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 51 * 52 * would produce output: 53 * 54 * reg=3<BITTWO,BITONE> 55 */ 56 57 #include <sys/types.h> 58 #include <stdarg.h> 59 #include "resolve.h" /* for __progname */ 60 #include "syscall.h" 61 #include "util.h" 62 63 static int lastfd = -1; 64 #define OUTBUFSIZE 128 65 static char outbuf[OUTBUFSIZE]; 66 static char *outptr = outbuf; 67 68 static void kprintn(int, u_long, int); 69 static void kdoprnt(int, const char *, va_list); 70 static void _dl_flushbuf(void); 71 72 static void putcharfd(int, int ); 73 74 static void 75 putcharfd(int c, int fd) 76 { 77 char b = c; 78 int len; 79 80 if (fd != lastfd) { 81 _dl_flushbuf(); 82 lastfd = fd; 83 } 84 *outptr++ = b; 85 len = outptr - outbuf; 86 if ((len >= OUTBUFSIZE) || (b == '\n') || (b == '\r')) { 87 _dl_flushbuf(); 88 } 89 } 90 91 static void 92 _dl_flushbuf() 93 { 94 int len = outptr - outbuf; 95 if (len != 0) { 96 _dl_write(lastfd, outbuf, len); 97 outptr = outbuf; 98 } 99 } 100 101 void 102 _dl_printf(const char *fmt, ...) 103 { 104 va_list ap; 105 106 va_start(ap, fmt); 107 kdoprnt(2, fmt, ap); 108 va_end(ap); 109 } 110 111 void 112 _dl_dprintf(int fd, const char *fmt, ...) 113 { 114 va_list ap; 115 116 va_start(ap, fmt); 117 kdoprnt(fd, fmt, ap); 118 va_end(ap); 119 } 120 121 void 122 _dl_vprintf(const char *fmt, va_list ap) 123 { 124 kdoprnt(2, fmt, ap); 125 } 126 127 static void 128 kdoprnt(int fd, const char *fmt, va_list ap) 129 { 130 unsigned long ul; 131 int lflag, ch; 132 char *p; 133 134 for (;;) { 135 while ((ch = *fmt++) != '%') { 136 if (ch == '\0') { 137 _dl_flushbuf(); 138 return; 139 } 140 putcharfd(ch, fd); 141 } 142 lflag = 0; 143 reswitch: 144 switch (ch = *fmt++) { 145 case 'l': 146 lflag = 1; 147 goto reswitch; 148 case 'b': 149 { 150 int set, n; 151 152 ul = va_arg(ap, int); 153 p = va_arg(ap, char *); 154 kprintn(fd, ul, *p++); 155 156 if (!ul) 157 break; 158 159 for (set = 0; (n = *p++);) { 160 if (ul & (1 << (n - 1))) { 161 putcharfd(set ? ',' : '<', fd); 162 for (; (n = *p) > ' '; ++p) 163 putcharfd(n, fd); 164 set = 1; 165 } else 166 for (; *p > ' '; ++p); 167 } 168 if (set) 169 putcharfd('>', fd); 170 } 171 break; 172 case 'c': 173 ch = va_arg(ap, int); 174 putcharfd(ch & 0x7f, fd); 175 break; 176 case 's': 177 p = va_arg(ap, char *); 178 while ((ch = *p++)) 179 putcharfd(ch, fd); 180 break; 181 case 'd': 182 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 183 if ((long)ul < 0) { 184 putcharfd('-', fd); 185 ul = -(long)ul; 186 } 187 kprintn(fd, ul, 10); 188 break; 189 case 'o': 190 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 191 kprintn(fd, ul, 8); 192 break; 193 case 'u': 194 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 195 kprintn(fd, ul, 10); 196 break; 197 case 'p': 198 putcharfd('0', fd); 199 putcharfd('x', fd); 200 lflag += sizeof(void *)==sizeof(u_long)? 1 : 0; 201 case 'x': 202 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 203 kprintn(fd, ul, 16); 204 break; 205 case 'X': 206 { 207 int l; 208 209 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 210 if (lflag) 211 l = (sizeof(ulong) * 8) - 4; 212 else 213 l = (sizeof(u_int) * 8) - 4; 214 while (l >= 0) { 215 putcharfd("0123456789abcdef"[(ul >> l) & 0xf], fd); 216 l -= 4; 217 } 218 break; 219 } 220 default: 221 putcharfd('%', fd); 222 if (lflag) 223 putcharfd('l', fd); 224 putcharfd(ch, fd); 225 } 226 } 227 } 228 229 static void 230 kprintn(int fd, unsigned long ul, int base) 231 { 232 /* hold a long in base 8 */ 233 char *p, buf[(sizeof(long) * NBBY / 3) + 1]; 234 235 p = buf; 236 do { 237 *p++ = "0123456789abcdef"[ul % base]; 238 } while (ul /= base); 239 do { 240 putcharfd(*--p, fd); 241 } while (p > buf); 242 } 243 244 static const char ldso[] = "ld.so: "; 245 246 __dead void 247 _dl_die(const char *fmt, ...) 248 { 249 va_list ap; 250 251 _dl_printf("%s%s: ", ldso, __progname); 252 va_start(ap, fmt); 253 kdoprnt(2, fmt, ap); 254 _dl_write(2, "\n", 1); 255 va_end(ap); 256 257 _dl_diedie(); 258 } 259 260 __dead void 261 _dl_oom(void) 262 { 263 static const char oom[] = ": out of memory\n"; 264 265 _dl_write(2, ldso, sizeof(ldso) - 1); 266 _dl_write(2, __progname, _dl_strlen(__progname)); 267 _dl_write(2, oom, sizeof(oom) - 1); 268 _dl_diedie(); 269 } 270