1 /* $NetBSD: subr_prf.c,v 1.21 2011/07/17 20:54:52 joerg 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 38 #include <sys/cdefs.h> 39 #include <sys/types.h> 40 #include <sys/stdint.h> /* XXX: for intptr_t */ 41 42 #include "stand.h" 43 44 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 45 #define INTMAX_T longlong_t 46 #define UINTMAX_T u_longlong_t 47 #else 48 #define INTMAX_T long 49 #define UINTMAX_T u_long 50 #endif 51 52 #if 0 /* XXX: abuse intptr_t until the situation with ptrdiff_t is clear */ 53 #define PTRDIFF_T ptrdiff_t 54 #else 55 #define PTRDIFF_T intptr_t 56 #endif 57 58 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 59 static void kprintn(void (*)(int), UINTMAX_T, int, int, int); 60 #else 61 static void kprintn(void (*)(int), UINTMAX_T, int); 62 #endif 63 static void sputchar(int); 64 static void kdoprnt(void (*)(int), const char *, va_list); 65 66 static char *sbuf, *ebuf; 67 #if defined(__minix) 68 /* vsnprintf: add support for returning the amount of characters that would have been 69 * written if the buffer was large enough */ 70 static int scount; 71 #endif /* defined(__minix) */ 72 73 const char hexdigits[16] = "0123456789abcdef"; 74 75 #define LONG 0x01 76 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 77 #define LLONG 0x02 78 #endif 79 80 #if defined(__minix) 81 #define HEXCAP 0x100 82 #endif /* defined(__minix) */ 83 84 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 85 #define ALT 0x04 86 #define SPACE 0x08 87 #define LADJUST 0x10 88 #define SIGN 0x20 89 #define ZEROPAD 0x40 90 #define NEGATIVE 0x80 91 #define KPRINTN(base) kprintn(put, ul, base, lflag, width) 92 #define RZERO() \ 93 do { \ 94 if ((lflag & (ZEROPAD|LADJUST)) == ZEROPAD) { \ 95 while (width-- > 0) \ 96 put('0'); \ 97 } \ 98 } while (/*CONSTCOND*/0) 99 #define RPAD() \ 100 do { \ 101 if (lflag & LADJUST) { \ 102 while (width-- > 0) \ 103 put(' '); \ 104 } \ 105 } while (/*CONSTCOND*/0) 106 #define LPAD() \ 107 do { \ 108 if ((lflag & (ZEROPAD|LADJUST)) == 0) { \ 109 while (width-- > 0) \ 110 put(' '); \ 111 } \ 112 } while (/*CONSTCOND*/0) 113 #else /* LIBSA_PRINTF_WIDTH_SUPPORT */ 114 #define KPRINTN(base) kprintn(put, ul, base) 115 #define RZERO() /**/ 116 #define RPAD() /**/ 117 #define LPAD() /**/ 118 #endif /* LIBSA_PRINTF_WIDTH_SUPPORT */ 119 120 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 121 #define KPRINT(base) \ 122 do { \ 123 ul = (lflag & LLONG) \ 124 ? va_arg(ap, u_longlong_t) \ 125 : (lflag & LONG) \ 126 ? va_arg(ap, u_long) \ 127 : va_arg(ap, u_int); \ 128 KPRINTN(base); \ 129 } while (/*CONSTCOND*/0) 130 #else /* LIBSA_PRINTF_LONGLONG_SUPPORT */ 131 #define KPRINT(base) \ 132 do { \ 133 ul = (lflag & LONG) \ 134 ? va_arg(ap, u_long) : va_arg(ap, u_int); \ 135 KPRINTN(base); \ 136 } while (/*CONSTCOND*/0) 137 #endif /* LIBSA_PRINTF_LONGLONG_SUPPORT */ 138 139 static void 140 sputchar(int c) 141 { 142 #if defined(__minix) 143 scount++; /* increase scount regardless */ 144 if (!sbuf) return; /* hanlde NULL sbuf */ 145 #endif /* defined(__minix) */ 146 if (sbuf < ebuf) 147 *sbuf++ = c; 148 } 149 150 void 151 vprintf(const char *fmt, va_list ap) 152 { 153 154 kdoprnt(putchar, fmt, ap); 155 #if defined(__minix) && defined(LIBSA_PRINTF_WIDTH_SUPPORT) 156 /* BJG: our libminc kputc() relies on a 0 to flush the diag buffer. */ 157 putchar(0); 158 #endif /* defined(__minix) && defined(LIBSA_PRINTF_WIDTH_SUPPORT) */ 159 } 160 161 int 162 vsnprintf(char *buf, size_t size, const char *fmt, va_list ap) 163 { 164 165 sbuf = buf; 166 ebuf = buf + size - 1; 167 #if defined(__minix) 168 scount = 0; /* use scount to keep track of written items */ 169 #endif /* defined(__minix) */ 170 171 kdoprnt(sputchar, fmt, ap); 172 173 #if defined(__minix) 174 if (sbuf){ /* handle case where sbuf == NULL */ 175 *sbuf = '\0'; 176 } 177 #if defined(_MINIX_MAGIC) 178 sbuf = ebuf = NULL; /* leave no dangling pointers */ 179 #endif 180 return scount; 181 #else /* __minix is not defined */ 182 *sbuf = '\0'; 183 return sbuf - buf; 184 #endif /* defined(__minix) */ 185 } 186 187 static void 188 kdoprnt(void (*put)(int), const char *fmt, va_list ap) 189 { 190 char *p; 191 int ch; 192 UINTMAX_T ul; 193 int lflag; 194 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 195 int width; 196 char *q; 197 #if defined(__minix) 198 int max; 199 #endif /* defined(__minix) */ 200 #endif 201 202 for (;;) { 203 while ((ch = *fmt++) != '%') { 204 if (ch == '\0') 205 return; 206 put(ch); 207 } 208 lflag = 0; 209 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 210 width = 0; 211 #if defined(__minix) 212 max = -1; 213 #endif /* defined(__minix) */ 214 #endif 215 reswitch: 216 switch (ch = *fmt++) { 217 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 218 #if defined(__minix) 219 case '.': 220 if (*fmt == '*') { 221 max = va_arg(ap, int); 222 fmt++; 223 } else for (max = 0; *fmt >= '0' && *fmt <= '9'; fmt++) 224 max = max * 10 + *fmt - '0'; 225 goto reswitch; 226 #endif /* defined(__minix) */ 227 case '#': 228 lflag |= ALT; 229 goto reswitch; 230 case ' ': 231 lflag |= SPACE; 232 goto reswitch; 233 case '-': 234 lflag |= LADJUST; 235 goto reswitch; 236 case '+': 237 lflag |= SIGN; 238 goto reswitch; 239 case '0': 240 lflag |= ZEROPAD; 241 goto reswitch; 242 case '1': case '2': case '3': case '4': case '5': 243 case '6': case '7': case '8': case '9': 244 for (;;) { 245 width *= 10; 246 width += ch - '0'; 247 ch = *fmt; 248 if ((unsigned)ch - '0' > 9) 249 break; 250 ++fmt; 251 } 252 #endif 253 goto reswitch; 254 case 'l': 255 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 256 if (*fmt == 'l') { 257 ++fmt; 258 lflag |= LLONG; 259 } else 260 #endif 261 lflag |= LONG; 262 goto reswitch; 263 case 't': 264 if (sizeof(PTRDIFF_T) == sizeof(long)) 265 lflag |= LONG; 266 goto reswitch; 267 case 'z': 268 if (sizeof(ssize_t) == sizeof(long)) 269 lflag |= LONG; 270 goto reswitch; 271 case 'c': 272 ch = va_arg(ap, int); 273 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 274 --width; 275 #endif 276 RPAD(); 277 put(ch & 0xFF); 278 LPAD(); 279 break; 280 case 's': 281 p = va_arg(ap, char *); 282 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 283 for (q = p; *q != '\0'; ++q) 284 continue; 285 #if defined(__minix) 286 if (max >= 0 && q - p > max) 287 q = &p[max]; 288 #endif /* defined(__minix) */ 289 width -= q - p; 290 #endif 291 RPAD(); 292 #if defined(LIBSA_PRINTF_WIDTH_SUPPORT) && defined(__minix) 293 while ((max < 0 || max-- > 0) && 294 (ch = (unsigned char)*p++)) 295 #else /* !defined(LIBSA_PRINTF_WIDTH_SUPPORT) || !defined(__minix) */ 296 while ((ch = (unsigned char)*p++)) 297 #endif /* !defined(LIBSA_PRINTF_WIDTH_SUPPORT) || !defined(__minix) */ 298 put(ch); 299 LPAD(); 300 break; 301 case 'd': 302 ul = 303 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 304 (lflag & LLONG) ? va_arg(ap, longlong_t) : 305 #endif 306 (lflag & LONG) ? va_arg(ap, long) : va_arg(ap, int); 307 if ((INTMAX_T)ul < 0) { 308 ul = -(INTMAX_T)ul; 309 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 310 lflag |= NEGATIVE; 311 #else 312 put('-'); 313 #endif 314 } 315 KPRINTN(10); 316 break; 317 case 'o': 318 KPRINT(8); 319 break; 320 case 'u': 321 KPRINT(10); 322 break; 323 case 'p': 324 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 325 lflag |= (LONG|ALT); 326 #else 327 put('0'); 328 put('x'); 329 #endif 330 /* FALLTHROUGH */ 331 case 'x': 332 KPRINT(16); 333 break; 334 #if defined(__minix) 335 case 'X': 336 lflag |= HEXCAP; 337 KPRINT(16); 338 break; 339 #endif /* defined(__minix) */ 340 default: 341 if (ch == '\0') 342 return; 343 put(ch); 344 break; 345 } 346 } 347 } 348 349 static void 350 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 351 kprintn(void (*put)(int), UINTMAX_T ul, int base, int lflag, int width) 352 #else 353 kprintn(void (*put)(int), UINTMAX_T ul, int base) 354 #endif 355 { 356 /* hold a INTMAX_T in base 8 */ 357 char *p, buf[(sizeof(INTMAX_T) * NBBY / 3) + 1 + 2 /* ALT + SIGN */]; 358 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 359 char *q; 360 #endif 361 362 p = buf; 363 do { 364 *p++ = hexdigits[ul % base]; 365 #if defined(__minix) 366 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 367 /* LSC: Quick hack to support capital hex printout. */ 368 if ((lflag & HEXCAP) && (*(p-1) >= 'a') && (*(p-1) <= 'z')) { 369 *(p-1) -= 32; 370 } 371 #endif 372 #endif /* defined(__minix) */ 373 } while (ul /= base); 374 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 375 q = p; 376 if (lflag & ALT && *(p - 1) != '0') { 377 if (base == 8) { 378 *p++ = '0'; 379 } else if (base == 16) { 380 *p++ = 'x'; 381 *p++ = '0'; 382 } 383 } 384 if (lflag & NEGATIVE) 385 *p++ = '-'; 386 else if (lflag & SIGN) 387 *p++ = '+'; 388 else if (lflag & SPACE) 389 *p++ = ' '; 390 width -= p - buf; 391 if ((lflag & LADJUST) == 0) { 392 while (p > q) 393 put(*--p); 394 } 395 #endif 396 RPAD(); 397 RZERO(); 398 do { 399 put(*--p); 400 } while (p > buf); 401 LPAD(); 402 } 403