printf.c revision 1.6
1 /* $NetBSD: printf.c,v 1.6 1995/09/03 20:51:21 pk 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 69 #include "stand.h" 70 71 static void kprintn __P((void (*)(int), u_long, int)); 72 static void sputchar __P((int)); 73 static void kprintf __P((void (*)(int), const char *, va_list)); 74 75 static char *sbuf; 76 77 static void 78 sputchar(c) 79 int c; 80 { 81 *sbuf++ = c; 82 } 83 84 void 85 #ifdef __STDC__ 86 sprintf(char *buf, const char *fmt, ...) 87 #else 88 sprintf(buf, fmt, va_alist) 89 char *buf, *fmt; 90 #endif 91 { 92 va_list ap; 93 94 sbuf = buf; 95 #ifdef __STDC__ 96 va_start(ap, fmt); 97 #else 98 va_start(ap); 99 #endif 100 kprintf(sputchar, fmt, ap); 101 va_end(ap); 102 *sbuf = '\0'; 103 } 104 105 void 106 #ifdef __STDC__ 107 printf(const char *fmt, ...) 108 #else 109 printf(fmt, va_alist) 110 char *fmt; 111 #endif 112 { 113 va_list ap; 114 115 #ifdef __STDC__ 116 va_start(ap, fmt); 117 #else 118 va_start(ap); 119 #endif 120 kprintf(putchar, fmt, ap); 121 va_end(ap); 122 } 123 124 void 125 kprintf(put, fmt, ap) 126 void (*put)__P((int)); 127 const char *fmt; 128 va_list ap; 129 { 130 register char *p; 131 register int ch, n; 132 unsigned long ul; 133 int lflag, set; 134 135 for (;;) { 136 while ((ch = *fmt++) != '%') { 137 if (ch == '\0') 138 return; 139 put(ch); 140 } 141 lflag = 0; 142 reswitch: switch (ch = *fmt++) { 143 case 'l': 144 lflag = 1; 145 goto reswitch; 146 case 'b': 147 ul = va_arg(ap, int); 148 p = va_arg(ap, char *); 149 kprintn(put, ul, *p++); 150 151 if (!ul) 152 break; 153 154 for (set = 0; (n = *p++);) { 155 if (ul & (1 << (n - 1))) { 156 put(set ? ',' : '<'); 157 for (; (n = *p) > ' '; ++p) 158 put(n); 159 set = 1; 160 } else 161 for (; *p > ' '; ++p); 162 } 163 if (set) 164 put('>'); 165 break; 166 case 'c': 167 ch = va_arg(ap, int); 168 put(ch & 0x7f); 169 break; 170 case 's': 171 p = va_arg(ap, char *); 172 while ((ch = *p++)) 173 put(ch); 174 break; 175 case 'd': 176 ul = lflag ? 177 va_arg(ap, long) : va_arg(ap, int); 178 if ((long)ul < 0) { 179 put('-'); 180 ul = -(long)ul; 181 } 182 kprintn(put, ul, 10); 183 break; 184 case 'o': 185 ul = lflag ? 186 va_arg(ap, u_long) : va_arg(ap, u_int); 187 kprintn(put, ul, 8); 188 break; 189 case 'u': 190 ul = lflag ? 191 va_arg(ap, u_long) : va_arg(ap, u_int); 192 kprintn(put, ul, 10); 193 break; 194 case 'x': 195 ul = lflag ? 196 va_arg(ap, u_long) : va_arg(ap, u_int); 197 kprintn(put, ul, 16); 198 break; 199 default: 200 put('%'); 201 if (lflag) 202 put('l'); 203 put(ch); 204 } 205 } 206 va_end(ap); 207 } 208 209 static void 210 kprintn(put, ul, base) 211 void (*put)__P((int)); 212 unsigned long ul; 213 int base; 214 { 215 /* hold a long in base 8 */ 216 char *p, buf[(sizeof(long) * NBBY / 3) + 1]; 217 218 p = buf; 219 do { 220 *p++ = "0123456789abcdef"[ul % base]; 221 } while (ul /= base); 222 do { 223 put(*--p); 224 } while (p > buf); 225 } 226 227 void 228 twiddle() 229 { 230 static int pos; 231 232 putchar("|/-\\"[pos++ & 3]); 233 putchar('\b'); 234 } 235
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