1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if !defined(BUILTIN) && !defined(SHELL) 35 #ifndef lint 36 static char copyright[] = 37 "@(#) Copyright (c) 1989, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif /* not lint */ 40 #endif 41 42 #ifndef lint 43 static char sccsid[] = "@(#)printf.c 8.1 (Berkeley) 7/20/93"; 44 #endif /* not lint */ 45 46 #include <sys/types.h> 47 48 #include <err.h> 49 #include <errno.h> 50 #include <limits.h> 51 #ifdef SHELL 52 #define EOF -1 53 #else 54 #include <stdio.h> 55 #endif 56 #include <stdlib.h> 57 #include <string.h> 58 59 /* 60 * XXX 61 * This *has* to go away. TK. 62 */ 63 #ifdef SHELL 64 #define main printfcmd 65 #define warnx(a, b, c) { \ 66 char buf[64]; \ 67 (void)sprintf(buf, sizeof(buf), a, b, c); \ 68 error(buf); \ 69 } 70 #include "../../bin/sh/bltin/bltin.h" 71 #endif 72 73 #define PF(f, func) { \ 74 if (fieldwidth) \ 75 if (precision) \ 76 (void)printf(f, fieldwidth, precision, func); \ 77 else \ 78 (void)printf(f, fieldwidth, func); \ 79 else if (precision) \ 80 (void)printf(f, precision, func); \ 81 else \ 82 (void)printf(f, func); \ 83 } 84 85 static int asciicode __P((void)); 86 static void escape __P((char *)); 87 static int getchr __P((void)); 88 static double getdouble __P((void)); 89 static int getint __P((int *)); 90 static int getlong __P((long *)); 91 static char *getstr __P((void)); 92 static char *mklong __P((char *, int)); 93 static void usage __P((void)); 94 95 static char **gargv; 96 97 int 98 #ifdef BUILTIN 99 progprintf(argc, argv) 100 #else 101 main(argc, argv) 102 #endif 103 int argc; 104 char *argv[]; 105 { 106 extern int optind; 107 static char *skip1, *skip2; 108 int ch, end, fieldwidth, precision; 109 char convch, nextch, *format, *fmt, *start; 110 111 while ((ch = getopt(argc, argv, "")) != EOF) 112 switch (ch) { 113 case '?': 114 default: 115 usage(); 116 return (1); 117 } 118 argc -= optind; 119 argv += optind; 120 121 if (argc < 1) { 122 usage(); 123 return (1); 124 } 125 126 /* 127 * Basic algorithm is to scan the format string for conversion 128 * specifications -- once one is found, find out if the field 129 * width or precision is a '*'; if it is, gather up value. Note, 130 * format strings are reused as necessary to use up the provided 131 * arguments, arguments of zero/null string are provided to use 132 * up the format string. 133 */ 134 skip1 = "#-+ 0"; 135 skip2 = "0123456789"; 136 137 escape(fmt = format = *argv); /* backslash interpretation */ 138 gargv = ++argv; 139 for (;;) { 140 end = 0; 141 /* find next format specification */ 142 next: for (start = fmt;; ++fmt) { 143 if (!*fmt) { 144 /* avoid infinite loop */ 145 if (end == 1) { 146 warnx("missing format character", 147 NULL, NULL); 148 return (1); 149 } 150 end = 1; 151 if (fmt > start) 152 (void)printf("%s", start); 153 if (!*gargv) 154 return (0); 155 fmt = format; 156 goto next; 157 } 158 /* %% prints a % */ 159 if (*fmt == '%') { 160 if (*++fmt != '%') 161 break; 162 *fmt++ = '\0'; 163 (void)printf("%s", start); 164 goto next; 165 } 166 } 167 168 /* skip to field width */ 169 for (; strchr(skip1, *fmt); ++fmt); 170 if (*fmt == '*') { 171 if (getint(&fieldwidth)) 172 return (1); 173 ++fmt; 174 } else { 175 fieldwidth = 0; 176 177 /* skip to possible '.', get following precision */ 178 for (; strchr(skip2, *fmt); ++fmt); 179 } 180 if (*fmt == '.') { 181 /* precision present? */ 182 ++fmt; 183 if (*fmt == '*') { 184 if (getint(&precision)) 185 return (1); 186 ++fmt; 187 } else { 188 precision = 0; 189 190 /* skip to conversion char */ 191 for (; strchr(skip2, *fmt); ++fmt); 192 } 193 } else 194 precision = 0; 195 if (!*fmt) { 196 warnx("missing format character", NULL, NULL); 197 return (1); 198 } 199 200 convch = *fmt; 201 nextch = *++fmt; 202 *fmt = '\0'; 203 switch(convch) { 204 case 'c': { 205 char p; 206 207 p = getchr(); 208 PF(start, p); 209 break; 210 } 211 case 's': { 212 char *p; 213 214 p = getstr(); 215 PF(start, p); 216 break; 217 } 218 case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': { 219 long p; 220 char *f; 221 222 if ((f = mklong(start, convch)) == NULL) 223 return (1); 224 if (getlong(&p)) 225 return (1); 226 PF(f, p); 227 break; 228 } 229 case 'e': case 'E': case 'f': case 'g': case 'G': { 230 double p; 231 232 p = getdouble(); 233 PF(start, p); 234 break; 235 } 236 default: 237 warnx("illegal format character %c", convch, NULL); 238 return (1); 239 } 240 *fmt = nextch; 241 } 242 /* NOTREACHED */ 243 } 244 245 static char * 246 mklong(str, ch) 247 char *str; 248 int ch; 249 { 250 static char copy[64]; 251 int len; 252 253 len = strlen(str) + 2; 254 memmove(copy, str, len - 3); 255 copy[len - 3] = 'l'; 256 copy[len - 2] = ch; 257 copy[len - 1] = '\0'; 258 return (copy); 259 } 260 261 static void 262 escape(fmt) 263 register char *fmt; 264 { 265 register char *store; 266 register int value, c; 267 268 for (store = fmt; c = *fmt; ++fmt, ++store) { 269 if (c != '\\') { 270 *store = c; 271 continue; 272 } 273 switch (*++fmt) { 274 case '\0': /* EOS, user error */ 275 *store = '\\'; 276 *++store = '\0'; 277 return; 278 case '\\': /* backslash */ 279 case '\'': /* single quote */ 280 *store = *fmt; 281 break; 282 case 'a': /* bell/alert */ 283 *store = '\7'; 284 break; 285 case 'b': /* backspace */ 286 *store = '\b'; 287 break; 288 case 'f': /* form-feed */ 289 *store = '\f'; 290 break; 291 case 'n': /* newline */ 292 *store = '\n'; 293 break; 294 case 'r': /* carriage-return */ 295 *store = '\r'; 296 break; 297 case 't': /* horizontal tab */ 298 *store = '\t'; 299 break; 300 case 'v': /* vertical tab */ 301 *store = '\13'; 302 break; 303 /* octal constant */ 304 case '0': case '1': case '2': case '3': 305 case '4': case '5': case '6': case '7': 306 for (c = 3, value = 0; 307 c-- && *fmt >= '0' && *fmt <= '7'; ++fmt) { 308 value <<= 3; 309 value += *fmt - '0'; 310 } 311 --fmt; 312 *store = value; 313 break; 314 default: 315 *store = *fmt; 316 break; 317 } 318 } 319 *store = '\0'; 320 } 321 322 static int 323 getchr() 324 { 325 if (!*gargv) 326 return ('\0'); 327 return ((int)**gargv++); 328 } 329 330 static char * 331 getstr() 332 { 333 if (!*gargv) 334 return (""); 335 return (*gargv++); 336 } 337 338 static char *Number = "+-.0123456789"; 339 static int 340 getint(ip) 341 int *ip; 342 { 343 long val; 344 345 if (getlong(&val)) 346 return (1); 347 if (val > INT_MAX) { 348 warnx("%s: %s", *gargv, strerror(ERANGE)); 349 return (1); 350 } 351 *ip = val; 352 return (0); 353 } 354 355 static int 356 getlong(lp) 357 long *lp; 358 { 359 long val; 360 char *ep; 361 362 if (!*gargv) { 363 *lp = 0; 364 return (0); 365 } 366 if (strchr(Number, **gargv)) { 367 errno = 0; 368 val = strtol(*gargv, &ep, 0); 369 if (*ep != '\0') { 370 warnx("%s: illegal number", *gargv, NULL); 371 return (1); 372 } 373 if (errno == ERANGE) 374 if (val == LONG_MAX) { 375 warnx("%s: %s", *gargv, strerror(ERANGE)); 376 return (1); 377 } 378 if (val == LONG_MIN) { 379 warnx("%s: %s", *gargv, strerror(ERANGE)); 380 return (1); 381 } 382 383 *lp = val; 384 ++gargv; 385 return (0); 386 } 387 *lp = (long)asciicode(); 388 return (0); 389 } 390 391 static double 392 getdouble() 393 { 394 if (!*gargv) 395 return ((double)0); 396 if (strchr(Number, **gargv)) 397 return (atof(*gargv++)); 398 return ((double)asciicode()); 399 } 400 401 static int 402 asciicode() 403 { 404 register int ch; 405 406 ch = **gargv; 407 if (ch == '\'' || ch == '"') 408 ch = (*gargv)[1]; 409 ++gargv; 410 return (ch); 411 } 412 413 static void 414 usage() 415 { 416 (void)fprintf(stderr, "usage: printf format [arg ...]\n"); 417 } 418