subr_prf.c revision 1.29
1 /* $NetBSD: subr_prf.c,v 1.29 2020/06/06 15:45:47 thorpej 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 RADJUSTZEROPAD() \ 83 do { \ 84 if ((lflag & (ZEROPAD|LADJUST)) == ZEROPAD) { \ 85 while (width-- > 0) \ 86 put('0'); \ 87 } \ 88 } while (/*CONSTCOND*/0) 89 #define LADJUSTPAD() \ 90 do { \ 91 if (lflag & LADJUST) { \ 92 while (width-- > 0) \ 93 put(' '); \ 94 } \ 95 } while (/*CONSTCOND*/0) 96 #define RADJUSTPAD() \ 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 RADJUSTZEROPAD() /**/ 106 #define LADJUSTPAD() /**/ 107 #define RADJUSTPAD() /**/ 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 null_sputchar(int c) 131 { 132 sbuf++; 133 } 134 135 static void 136 sputchar(int c) 137 { 138 139 if (sbuf < ebuf) 140 *sbuf++ = c; 141 } 142 143 void 144 vprintf(const char *fmt, va_list ap) 145 { 146 147 kdoprnt(putchar, fmt, ap); 148 } 149 150 int 151 vsnprintf(char *buf, size_t size, const char *fmt, va_list ap) 152 { 153 154 sbuf = buf; 155 ebuf = buf + size - 1; 156 kdoprnt(buf == NULL ? null_sputchar : sputchar, fmt, ap); 157 if (buf != NULL) 158 *sbuf = '\0'; 159 return sbuf - buf; 160 } 161 162 static void 163 kdoprnt(void (*put)(int), const char *fmt, va_list ap) 164 { 165 char *p; 166 int ch; 167 UINTMAX_T ul; 168 int lflag; 169 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 170 int width; 171 char *q; 172 #endif 173 174 for (;;) { 175 while ((ch = *fmt++) != '%') { 176 if (ch == '\0') 177 return; 178 put(ch); 179 } 180 lflag = 0; 181 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 182 width = 0; 183 #endif 184 reswitch: 185 switch (ch = *fmt++) { 186 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 187 case '#': 188 lflag |= ALT; 189 goto reswitch; 190 case ' ': 191 lflag |= SPACE; 192 goto reswitch; 193 case '-': 194 lflag |= LADJUST; 195 goto reswitch; 196 case '+': 197 lflag |= SIGN; 198 goto reswitch; 199 case '0': 200 lflag |= ZEROPAD; 201 goto reswitch; 202 case '1': case '2': case '3': case '4': case '5': 203 case '6': case '7': case '8': case '9': 204 for (;;) { 205 width *= 10; 206 width += ch - '0'; 207 ch = *fmt; 208 if ((unsigned)ch - '0' > 9) 209 break; 210 ++fmt; 211 } 212 #endif 213 case 'l': 214 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 215 if (*fmt == 'l') { 216 ++fmt; 217 lflag |= LLONG; 218 } else 219 #endif 220 lflag |= LONG; 221 goto reswitch; 222 case 'j': 223 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 224 if (sizeof(intmax_t) == sizeof(long long)) 225 lflag |= LLONG; 226 else 227 #endif 228 if (sizeof(intmax_t) == sizeof(long)) 229 lflag |= LONG; 230 goto reswitch; 231 case 't': 232 if (sizeof(PTRDIFF_T) == sizeof(long)) 233 lflag |= LONG; 234 goto reswitch; 235 case 'z': 236 if (sizeof(ssize_t) == sizeof(long)) 237 lflag |= LONG; 238 goto reswitch; 239 case 'c': 240 ch = va_arg(ap, int); 241 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 242 --width; 243 #endif 244 RADJUSTPAD(); 245 put(ch & 0xFF); 246 LADJUSTPAD(); 247 break; 248 case 's': 249 p = va_arg(ap, char *); 250 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 251 for (q = p; *q != '\0'; ++q) 252 continue; 253 width -= q - p; 254 #endif 255 RADJUSTPAD(); 256 while ((ch = (unsigned char)*p++)) 257 put(ch); 258 LADJUSTPAD(); 259 break; 260 case 'd': 261 ul = 262 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT 263 (lflag & LLONG) ? va_arg(ap, longlong_t) : 264 #endif 265 (lflag & LONG) ? va_arg(ap, long) : va_arg(ap, int); 266 if ((INTMAX_T)ul < 0) { 267 ul = -(INTMAX_T)ul; 268 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 269 lflag |= NEGATIVE; 270 #else 271 put('-'); 272 #endif 273 } 274 KPRINTN(10); 275 break; 276 case 'o': 277 KPRINT(8); 278 break; 279 case 'u': 280 KPRINT(10); 281 break; 282 case 'p': 283 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 284 lflag |= (LONG|ALT); 285 #else 286 put('0'); 287 put('x'); 288 #endif 289 /* FALLTHROUGH */ 290 case 'x': 291 KPRINT(16); 292 break; 293 default: 294 if (ch == '\0') 295 return; 296 put(ch); 297 break; 298 } 299 } 300 } 301 302 static void 303 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 304 kprintn(void (*put)(int), UINTMAX_T ul, int base, int lflag, int width) 305 #else 306 kprintn(void (*put)(int), UINTMAX_T ul, int base) 307 #endif 308 { 309 /* hold a INTMAX_T in base 8 */ 310 char *p, buf[(sizeof(INTMAX_T) * NBBY / 3) + 1 + 2 /* ALT + SIGN */]; 311 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 312 char *q; 313 #endif 314 315 p = buf; 316 do { 317 *p++ = hexdigits[ul % base]; 318 } while (ul /= base); 319 #ifdef LIBSA_PRINTF_WIDTH_SUPPORT 320 q = p; 321 if (lflag & ALT && *(p - 1) != '0') { 322 if (base == 8) { 323 *p++ = '0'; 324 } else if (base == 16) { 325 *p++ = 'x'; 326 *p++ = '0'; 327 } 328 } 329 if (lflag & NEGATIVE) 330 *p++ = '-'; 331 else if (lflag & SIGN) 332 *p++ = '+'; 333 else if (lflag & SPACE) 334 *p++ = ' '; 335 width -= p - buf; 336 if (lflag & ZEROPAD) { 337 while (p > q) 338 put(*--p); 339 } 340 #endif 341 RADJUSTPAD(); 342 RADJUSTZEROPAD(); 343 do { 344 put(*--p); 345 } while (p > buf); 346 LADJUSTPAD(); 347 } 348
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