subr_prf.c revision 1.21
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 68 const char hexdigits[16] = "0123456789abcdef"; 69 70 #define LONG 0x01 71 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 72 #define LLONG 0x02 73 #endif 74 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 75 #define ALT 0x04 76 #define SPACE 0x08 77 #define LADJUST 0x10 78 #define SIGN 0x20 79 #define ZEROPAD 0x40 80 #define NEGATIVE 0x80 81 #define KPRINTN(base) kprintn(put, ul, base, lflag, width) 82 #define RZERO() \ 83 do { \ 84 if ((lflag & (ZEROPAD|LADJUST)) == ZEROPAD) { \ 85 while (width-- > 0) \ 86 put('0'); \ 87 } \ 88 } while (/*CONSTCOND*/0) 89 #define RPAD() \ 90 do { \ 91 if (lflag & LADJUST) { \ 92 while (width-- > 0) \ 93 put(' '); \ 94 } \ 95 } while (/*CONSTCOND*/0) 96 #define LPAD() \ 97 do { \ 98 if ((lflag & (ZEROPAD|LADJUST)) == 0) { \ 99 while (width-- > 0) \ 100 put(' '); \ 101 } \ 102 } while (/*CONSTCOND*/0) 103 #else /* LIBSA_PRINTF_WIDTH_SUPPORT */ 104 #define KPRINTN(base) kprintn(put, ul, base) 105 #define RZERO() /**/ 106 #define RPAD() /**/ 107 #define LPAD() /**/ 108 #endif /* LIBSA_PRINTF_WIDTH_SUPPORT */ 109 110 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 111 #define KPRINT(base) \ 112 do { \ 113 ul = (lflag & LLONG) \ 114 ? va_arg(ap, u_longlong_t) \ 115 : (lflag & LONG) \ 116 ? va_arg(ap, u_long) \ 117 : va_arg(ap, u_int); \ 118 KPRINTN(base); \ 119 } while (/*CONSTCOND*/0) 120 #else /* LIBSA_PRINTF_LONGLONG_SUPPORT */ 121 #define KPRINT(base) \ 122 do { \ 123 ul = (lflag & LONG) \ 124 ? va_arg(ap, u_long) : va_arg(ap, u_int); \ 125 KPRINTN(base); \ 126 } while (/*CONSTCOND*/0) 127 #endif /* LIBSA_PRINTF_LONGLONG_SUPPORT */ 128 129 static void 130 sputchar(int c) 131 { 132 133 if (sbuf < ebuf) 134 *sbuf++ = c; 135 } 136 137 void 138 vprintf(const char *fmt, va_list ap) 139 { 140 141 kdoprnt(putchar, fmt, ap); 142 } 143 144 int 145 vsnprintf(char *buf, size_t size, const char *fmt, va_list ap) 146 { 147 148 sbuf = buf; 149 ebuf = buf + size - 1; 150 kdoprnt(sputchar, fmt, ap); 151 *sbuf = '\0'; 152 return sbuf - buf; 153 } 154 155 static void 156 kdoprnt(void (*put)(int), const char *fmt, va_list ap) 157 { 158 char *p; 159 int ch; 160 UINTMAX_T ul; 161 int lflag; 162 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 163 int width; 164 char *q; 165 #endif 166 167 for (;;) { 168 while ((ch = *fmt++) != '%') { 169 if (ch == '\0') 170 return; 171 put(ch); 172 } 173 lflag = 0; 174 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 175 width = 0; 176 #endif 177 reswitch: 178 switch (ch = *fmt++) { 179 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 180 case '#': 181 lflag |= ALT; 182 goto reswitch; 183 case ' ': 184 lflag |= SPACE; 185 goto reswitch; 186 case '-': 187 lflag |= LADJUST; 188 goto reswitch; 189 case '+': 190 lflag |= SIGN; 191 goto reswitch; 192 case '0': 193 lflag |= ZEROPAD; 194 goto reswitch; 195 case '1': case '2': case '3': case '4': case '5': 196 case '6': case '7': case '8': case '9': 197 for (;;) { 198 width *= 10; 199 width += ch - '0'; 200 ch = *fmt; 201 if ((unsigned)ch - '0' > 9) 202 break; 203 ++fmt; 204 } 205 #endif 206 goto reswitch; 207 case 'l': 208 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 209 if (*fmt == 'l') { 210 ++fmt; 211 lflag |= LLONG; 212 } else 213 #endif 214 lflag |= LONG; 215 goto reswitch; 216 case 't': 217 if (sizeof(PTRDIFF_T) == sizeof(long)) 218 lflag |= LONG; 219 goto reswitch; 220 case 'z': 221 if (sizeof(ssize_t) == sizeof(long)) 222 lflag |= LONG; 223 goto reswitch; 224 case 'c': 225 ch = va_arg(ap, int); 226 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 227 --width; 228 #endif 229 RPAD(); 230 put(ch & 0xFF); 231 LPAD(); 232 break; 233 case 's': 234 p = va_arg(ap, char *); 235 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 236 for (q = p; *q != '\0'; ++q) 237 continue; 238 width -= q - p; 239 #endif 240 RPAD(); 241 while ((ch = (unsigned char)*p++)) 242 put(ch); 243 LPAD(); 244 break; 245 case 'd': 246 ul = 247 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 248 (lflag & LLONG) ? va_arg(ap, longlong_t) : 249 #endif 250 (lflag & LONG) ? va_arg(ap, long) : va_arg(ap, int); 251 if ((INTMAX_T)ul < 0) { 252 ul = -(INTMAX_T)ul; 253 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 254 lflag |= NEGATIVE; 255 #else 256 put('-'); 257 #endif 258 } 259 KPRINTN(10); 260 break; 261 case 'o': 262 KPRINT(8); 263 break; 264 case 'u': 265 KPRINT(10); 266 break; 267 case 'p': 268 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 269 lflag |= (LONG|ALT); 270 #else 271 put('0'); 272 put('x'); 273 #endif 274 /* FALLTHROUGH */ 275 case 'x': 276 KPRINT(16); 277 break; 278 default: 279 if (ch == '\0') 280 return; 281 put(ch); 282 break; 283 } 284 } 285 } 286 287 static void 288 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 289 kprintn(void (*put)(int), UINTMAX_T ul, int base, int lflag, int width) 290 #else 291 kprintn(void (*put)(int), UINTMAX_T ul, int base) 292 #endif 293 { 294 /* hold a INTMAX_T in base 8 */ 295 char *p, buf[(sizeof(INTMAX_T) * NBBY / 3) + 1 + 2 /* ALT + SIGN */]; 296 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 297 char *q; 298 #endif 299 300 p = buf; 301 do { 302 *p++ = hexdigits[ul % base]; 303 } while (ul /= base); 304 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 305 q = p; 306 if (lflag & ALT && *(p - 1) != '0') { 307 if (base == 8) { 308 *p++ = '0'; 309 } else if (base == 16) { 310 *p++ = 'x'; 311 *p++ = '0'; 312 } 313 } 314 if (lflag & NEGATIVE) 315 *p++ = '-'; 316 else if (lflag & SIGN) 317 *p++ = '+'; 318 else if (lflag & SPACE) 319 *p++ = ' '; 320 width -= p - buf; 321 if ((lflag & LADJUST) == 0) { 322 while (p > q) 323 put(*--p); 324 } 325 #endif 326 RPAD(); 327 RZERO(); 328 do { 329 put(*--p); 330 } while (p > buf); 331 LPAD(); 332 } 333
Indexes created Wed Oct 01 19:09:53 GMT 2025