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 return scount; 178 #else /* __minix is not defined */ 179 *sbuf = '\0'; 180 return sbuf - buf; 181 #endif /* defined(__minix) */ 182 } 183 184 static void 185 kdoprnt(void (*put)(int), const char *fmt, va_list ap) 186 { 187 char *p; 188 int ch; 189 UINTMAX_T ul; 190 int lflag; 191 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 192 int width; 193 char *q; 194 #if defined(__minix) 195 int max; 196 #endif /* defined(__minix) */ 197 #endif 198 199 for (;;) { 200 while ((ch = *fmt++) != '%') { 201 if (ch == '\0') 202 return; 203 put(ch); 204 } 205 lflag = 0; 206 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 207 width = 0; 208 #if defined(__minix) 209 max = -1; 210 #endif /* defined(__minix) */ 211 #endif 212 reswitch: 213 switch (ch = *fmt++) { 214 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 215 #if defined(__minix) 216 case '.': 217 if (*fmt == '*') { 218 max = va_arg(ap, int); 219 fmt++; 220 } else for (max = 0; *fmt >= '0' && *fmt <= '9'; fmt++) 221 max = max * 10 + *fmt - '0'; 222 goto reswitch; 223 #endif /* defined(__minix) */ 224 case '#': 225 lflag |= ALT; 226 goto reswitch; 227 case ' ': 228 lflag |= SPACE; 229 goto reswitch; 230 case '-': 231 lflag |= LADJUST; 232 goto reswitch; 233 case '+': 234 lflag |= SIGN; 235 goto reswitch; 236 case '0': 237 lflag |= ZEROPAD; 238 goto reswitch; 239 case '1': case '2': case '3': case '4': case '5': 240 case '6': case '7': case '8': case '9': 241 for (;;) { 242 width *= 10; 243 width += ch - '0'; 244 ch = *fmt; 245 if ((unsigned)ch - '0' > 9) 246 break; 247 ++fmt; 248 } 249 #endif 250 goto reswitch; 251 case 'l': 252 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 253 if (*fmt == 'l') { 254 ++fmt; 255 lflag |= LLONG; 256 } else 257 #endif 258 lflag |= LONG; 259 goto reswitch; 260 case 't': 261 if (sizeof(PTRDIFF_T) == sizeof(long)) 262 lflag |= LONG; 263 goto reswitch; 264 case 'z': 265 if (sizeof(ssize_t) == sizeof(long)) 266 lflag |= LONG; 267 goto reswitch; 268 case 'c': 269 ch = va_arg(ap, int); 270 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 271 --width; 272 #endif 273 RPAD(); 274 put(ch & 0xFF); 275 LPAD(); 276 break; 277 case 's': 278 p = va_arg(ap, char *); 279 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 280 for (q = p; *q != '\0'; ++q) 281 continue; 282 #if defined(__minix) 283 if (max >= 0 && q - p > max) 284 q = &p[max]; 285 #endif /* defined(__minix) */ 286 width -= q - p; 287 #endif 288 RPAD(); 289 #if defined(LIBSA_PRINTF_WIDTH_SUPPORT) && defined(__minix) 290 while ((max < 0 || max-- > 0) && 291 (ch = (unsigned char)*p++)) 292 #else /* !defined(LIBSA_PRINTF_WIDTH_SUPPORT) || !defined(__minix) */ 293 while ((ch = (unsigned char)*p++)) 294 #endif /* !defined(LIBSA_PRINTF_WIDTH_SUPPORT) || !defined(__minix) */ 295 put(ch); 296 LPAD(); 297 break; 298 case 'd': 299 ul = 300 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 301 (lflag & LLONG) ? va_arg(ap, longlong_t) : 302 #endif 303 (lflag & LONG) ? va_arg(ap, long) : va_arg(ap, int); 304 if ((INTMAX_T)ul < 0) { 305 ul = -(INTMAX_T)ul; 306 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 307 lflag |= NEGATIVE; 308 #else 309 put('-'); 310 #endif 311 } 312 KPRINTN(10); 313 break; 314 case 'o': 315 KPRINT(8); 316 break; 317 case 'u': 318 KPRINT(10); 319 break; 320 case 'p': 321 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 322 lflag |= (LONG|ALT); 323 #else 324 put('0'); 325 put('x'); 326 #endif 327 /* FALLTHROUGH */ 328 case 'x': 329 KPRINT(16); 330 break; 331 #if defined(__minix) 332 case 'X': 333 lflag |= HEXCAP; 334 KPRINT(16); 335 break; 336 #endif /* defined(__minix) */ 337 default: 338 if (ch == '\0') 339 return; 340 put(ch); 341 break; 342 } 343 } 344 } 345 346 static void 347 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 348 kprintn(void (*put)(int), UINTMAX_T ul, int base, int lflag, int width) 349 #else 350 kprintn(void (*put)(int), UINTMAX_T ul, int base) 351 #endif 352 { 353 /* hold a INTMAX_T in base 8 */ 354 char *p, buf[(sizeof(INTMAX_T) * NBBY / 3) + 1 + 2 /* ALT + SIGN */]; 355 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 356 char *q; 357 #endif 358 359 p = buf; 360 do { 361 *p++ = hexdigits[ul % base]; 362 #if defined(__minix) 363 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 364 /* LSC: Quick hack to support capital hex printout. */ 365 if ((lflag & HEXCAP) && (*(p-1) >= 'a') && (*(p-1) <= 'z')) { 366 *(p-1) -= 32; 367 } 368 #endif 369 #endif /* defined(__minix) */ 370 } while (ul /= base); 371 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 372 q = p; 373 if (lflag & ALT && *(p - 1) != '0') { 374 if (base == 8) { 375 *p++ = '0'; 376 } else if (base == 16) { 377 *p++ = 'x'; 378 *p++ = '0'; 379 } 380 } 381 if (lflag & NEGATIVE) 382 *p++ = '-'; 383 else if (lflag & SIGN) 384 *p++ = '+'; 385 else if (lflag & SPACE) 386 *p++ = ' '; 387 width -= p - buf; 388 if ((lflag & LADJUST) == 0) { 389 while (p > q) 390 put(*--p); 391 } 392 #endif 393 RPAD(); 394 RZERO(); 395 do { 396 put(*--p); 397 } while (p > buf); 398 LPAD(); 399 } 400