printf.c revision 1.14
1 /* $NetBSD: printf.c,v 1.14 1999/02/11 14:32:00 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 <machine/stdarg.h> 65 #else 66 #include <machine/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 kdoprnt __P((void (*)(int), const char *, va_list)); 74 75 static char *sbuf, *ebuf; 76 77 static void 78 sputchar(c) 79 int c; 80 { 81 if (sbuf < ebuf) 82 *sbuf++ = c; 83 } 84 85 int 86 #ifdef __STDC__ 87 sprintf(char *buf, const char *fmt, ...) 88 #else 89 sprintf(buf, fmt, va_alist) 90 char *buf, *fmt; 91 #endif 92 { 93 va_list ap; 94 int len; 95 96 #ifdef __STDC__ 97 va_start(ap, fmt); 98 #else 99 va_start(ap); 100 #endif 101 len = vsnprintf(buf, -(size_t)buf, fmt, ap); 102 va_end(ap); 103 return (len); 104 } 105 106 int 107 #ifdef __STDC__ 108 snprintf(char *buf, size_t size, const char *fmt, ...) 109 #else 110 snprintf(buf, size, fmt, va_alist) 111 char *buf, *fmt; 112 size_t size; 113 #endif 114 { 115 va_list ap; 116 int len; 117 118 #ifdef __STDC__ 119 va_start(ap, fmt); 120 #else 121 va_start(ap); 122 #endif 123 len = vsnprintf(buf, size, fmt, ap); 124 va_end(ap); 125 return (len); 126 } 127 128 void 129 #ifdef __STDC__ 130 printf(const char *fmt, ...) 131 #else 132 printf(fmt, va_alist) 133 char *fmt; 134 #endif 135 { 136 va_list ap; 137 138 #ifdef __STDC__ 139 va_start(ap, fmt); 140 #else 141 va_start(ap); 142 #endif 143 kdoprnt(putchar, fmt, ap); 144 va_end(ap); 145 } 146 147 void 148 vprintf(const char *fmt, va_list ap) 149 { 150 151 kdoprnt(putchar, fmt, ap); 152 } 153 154 int 155 vsnprintf(char *buf, size_t size, const char *fmt, va_list ap) 156 { 157 158 sbuf = buf; 159 ebuf = buf + size - 1; 160 kdoprnt(sputchar, fmt, ap); 161 *sbuf = '\0'; 162 return (sbuf - buf); 163 } 164 165 int 166 vsprintf(char *buf, const char *fmt, va_list ap) 167 { 168 169 return (vsnprintf(buf, -(size_t)buf, fmt, ap)); 170 } 171 172 void 173 kdoprnt(put, fmt, ap) 174 void (*put)__P((int)); 175 const char *fmt; 176 va_list ap; 177 { 178 register char *p; 179 register int ch, n; 180 unsigned long ul; 181 int lflag, set; 182 183 for (;;) { 184 while ((ch = *fmt++) != '%') { 185 if (ch == '\0') 186 return; 187 put(ch); 188 } 189 lflag = 0; 190 reswitch: switch (ch = *fmt++) { 191 case '\0': 192 /* XXX print the last format character? */ 193 return; 194 case 'l': 195 lflag = 1; 196 goto reswitch; 197 case 'b': 198 ul = va_arg(ap, int); 199 p = va_arg(ap, char *); 200 kprintn(put, ul, *p++); 201 202 if (!ul) 203 break; 204 205 for (set = 0; (n = *p++);) { 206 if (ul & (1 << (n - 1))) { 207 put(set ? ',' : '<'); 208 for (; (n = *p) > ' '; ++p) 209 put(n); 210 set = 1; 211 } else 212 for (; *p > ' '; ++p); 213 } 214 if (set) 215 put('>'); 216 break; 217 case 'c': 218 ch = va_arg(ap, int); 219 put(ch & 0x7f); 220 break; 221 case 's': 222 p = va_arg(ap, char *); 223 while ((ch = *p++)) 224 put(ch); 225 break; 226 case 'd': 227 ul = lflag ? 228 va_arg(ap, long) : va_arg(ap, int); 229 if ((long)ul < 0) { 230 put('-'); 231 ul = -(long)ul; 232 } 233 kprintn(put, ul, 10); 234 break; 235 case 'o': 236 ul = lflag ? 237 va_arg(ap, u_long) : va_arg(ap, u_int); 238 kprintn(put, ul, 8); 239 break; 240 case 'u': 241 ul = lflag ? 242 va_arg(ap, u_long) : va_arg(ap, u_int); 243 kprintn(put, ul, 10); 244 break; 245 case 'p': 246 put('0'); 247 put('x'); 248 /* fall through */ 249 case 'x': 250 ul = lflag ? 251 va_arg(ap, u_long) : va_arg(ap, u_int); 252 kprintn(put, ul, 16); 253 break; 254 default: 255 put('%'); 256 if (lflag) 257 put('l'); 258 put(ch); 259 } 260 } 261 va_end(ap); 262 } 263 264 static void 265 kprintn(put, ul, base) 266 void (*put)__P((int)); 267 unsigned long ul; 268 int base; 269 { 270 /* hold a long in base 8 */ 271 char *p, buf[(sizeof(long) * NBBY / 3) + 1]; 272 273 p = buf; 274 do { 275 *p++ = "0123456789abcdef"[ul % base]; 276 } while (ul /= base); 277 do { 278 put(*--p); 279 } while (p > buf); 280 } 281 282 void 283 twiddle() 284 { 285 static int pos; 286 287 putchar("|/-\\"[pos++ & 3]); 288 putchar('\b'); 289 } 290
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