1 /* $OpenBSD: dl_printf.c,v 1.2 2001/06/06 12:38:44 art 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)printf.c 8.1 (Berkeley) 6/11/93 36 */ 37 38 /* 39 * Scaled down version of printf(3). 40 * 41 * One additional format: 42 * 43 * The format %b is supported to decode error registers. 44 * Its usage is: 45 * 46 * printf("reg=%b\n", regval, "<base><arg>*"); 47 * 48 * where <base> is the output base expressed as a control character, e.g. 49 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 50 * the first of which gives the bit number to be inspected (origin 1), and 51 * the next characters (up to a control character, i.e. a character <= 32), 52 * give the name of the register. Thus: 53 * 54 * printf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 55 * 56 * would produce output: 57 * 58 * reg=3<BITTWO,BITONE> 59 */ 60 61 #include <sys/cdefs.h> 62 #include <sys/types.h> 63 #ifdef __STDC__ 64 #include <stdarg.h> 65 #else 66 #include <varargs.h> 67 #endif 68 #include "syscall.h" 69 70 static void kprintn __P((void (*)(int), u_long, int)); 71 static void kdoprnt __P((void (*)(int), const char *, va_list)); 72 73 static void putchar __P((int)); 74 static void sputchar __P((int)); 75 static char *sbuf; 76 77 static void 78 putchar(int c) 79 { 80 char b; 81 b = c; 82 _dl_write(2, &b, 1); 83 } 84 85 static void 86 sputchar(int c) 87 { 88 *sbuf++ = c; 89 } 90 91 void 92 _dl_sprintf(char *buf, const char *fmt, ...) 93 { 94 va_list ap; 95 96 sbuf = buf; 97 va_start(ap, fmt); 98 kdoprnt(sputchar, fmt, ap); 99 va_end(ap); 100 *sbuf = '\0'; 101 } 102 103 void 104 _dl_printf(const char *fmt, ...) 105 { 106 va_list ap; 107 108 va_start(ap, fmt); 109 kdoprnt(putchar, fmt, ap); 110 va_end(ap); 111 } 112 113 void 114 _dl_vprintf(const char *fmt, va_list ap) 115 { 116 kdoprnt(putchar, fmt, ap); 117 } 118 119 static void 120 kdoprnt(void (*put)(int), const char *fmt, va_list ap) 121 { 122 char *p; 123 int ch; 124 unsigned long ul; 125 int lflag; 126 127 for (;;) { 128 while ((ch = *fmt++) != '%') { 129 if (ch == '\0') 130 return; 131 put(ch); 132 } 133 lflag = 0; 134 reswitch: 135 switch (ch = *fmt++) { 136 case 'l': 137 lflag = 1; 138 goto reswitch; 139 case 'b': 140 { 141 int set, n; 142 ul = va_arg(ap, int); 143 p = va_arg(ap, char *); 144 kprintn(put, ul, *p++); 145 146 if (!ul) 147 break; 148 149 for (set = 0; (n = *p++);) { 150 if (ul & (1 << (n - 1))) { 151 put(set ? ',' : '<'); 152 for (; (n = *p) > ' '; ++p) 153 put(n); 154 set = 1; 155 } else 156 for (; *p > ' '; ++p); 157 } 158 if (set) 159 put('>'); 160 } 161 break; 162 case 'c': 163 ch = va_arg(ap, int); 164 put(ch & 0x7f); 165 break; 166 case 's': 167 p = va_arg(ap, char *); 168 while ((ch = *p++)) 169 put(ch); 170 break; 171 case 'd': 172 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 173 if ((long)ul < 0) { 174 put('-'); 175 ul = -(long)ul; 176 } 177 kprintn(put, ul, 10); 178 break; 179 case 'o': 180 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 181 kprintn(put, ul, 8); 182 break; 183 case 'u': 184 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 185 kprintn(put, ul, 10); 186 break; 187 case 'p': 188 put('0'); 189 put('x'); 190 lflag += sizeof(void *)==sizeof(u_long)? 1 : 0; 191 case 'x': 192 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 193 kprintn(put, ul, 16); 194 break; 195 case 'X': 196 { 197 int l = 28; 198 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 199 while(l >= 0) { 200 put("0123456789abcdef"[(ul >> l) & 0xf]); 201 l -= 4; 202 } 203 break; 204 } 205 default: 206 put('%'); 207 if (lflag) 208 put('l'); 209 put(ch); 210 } 211 } 212 va_end(ap); 213 } 214 215 static void 216 kprintn(void (*put)(int), unsigned long ul, int base) 217 { 218 /* hold a long in base 8 */ 219 char *p, buf[(sizeof(long) * NBBY / 3) + 1]; 220 221 p = buf; 222 do { 223 *p++ = "0123456789abcdef"[ul % base]; 224 } while (ul /= base); 225 do { 226 put(*--p); 227 } while (p > buf); 228 } 229