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