src/tools/dumpscan/xf_printf.c

   1 /*
   2  * CMUCS AFStools
   3  * dumpscan - routines for scanning and manipulating AFS volume dumps
   4  *
   5  * Copyright (c) 1998 Carnegie Mellon University
   6  * All Rights Reserved.
   7  *
   8  * Permission to use, copy, modify and distribute this software and its
   9  * documentation is hereby granted, provided that both the copyright
  10  * notice and this permission notice appear in all copies of the
  11  * software, derivative works or modified versions, and any portions
  12  * thereof, and that both notices appear in supporting documentation.
  13  *
  14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  16  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  17  *
  18  * Carnegie Mellon requests users of this software to return to
  19  *
  20  *  Software Distribution Coordinator  or  Software_Distribution@CS.CMU.EDU
  21  *  School of Computer Science
  22  *  Carnegie Mellon University
  23  *  Pittsburgh PA 15213-3890
  24  *
  25  * any improvements or extensions that they make and grant Carnegie Mellon
  26  * the rights to redistribute these changes.
  27  */
  28
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <stdio.h>
  32 #include <ctype.h>
  33 #include <netinet/in.h>
  34 #include <netdb.h>
  35 #include <stdarg.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38
  39 #include "xfiles.h"
  40 #include "xf_errs.h"
  41
  42 #define SPBUFLEN 40
  43 static char spbuf[SPBUFLEN + 1] = "";
  44
  45
  46 #define MAXPREC 100
  47
  48 /* Generate an ASCII representation of an integer <val>, as follows:
  49  * <base> indicates the base to be used (2-36)
  50  * <uc> is nonzero if letter digits should be uppercase
  51  * <prec> is the minimum number of digits
  52  * The resulting number is stored in <buf>, which must be long enough
  53  * to receive it.  The minimum length is <prec> or ceil(log{base}(val)),
  54  * whichever is larger, plus room for a trailing NUL.
  55  */
  56 static void
  57 mkint(char *buf, unsigned long val, int base, int uc, int prec)
  58 {
  59     int len = 0, dig, i;
  60
  61     while (val) {
  62         dig = val % base;
  63         val = (val - dig) / base;
  64         if (dig < 10)
  65             dig = dig + '0';
  66         else if (uc)
  67             dig = dig + 'A' - 10;
  68         else
  69             dig = dig + 'a' - 10;
  70         buf[len++] = dig;
  71     }
  72     while (len < prec)
  73         buf[len++] = '0';
  74     for (i = 0; i < (len + 1) / 2; i++) {
  75         dig = buf[i];
  76         buf[i] = buf[len - i - 1];
  77         buf[len - i - 1] = dig;
  78     }
  79     buf[len] = 0;
  80 }
  81
  82
  83 /* Write spaces faster than one at a time */
  84 static afs_uint32
  85 wsp(XFILE * X, int count)
  86 {
  87     char *x;
  88     afs_uint32 err;
  89     int i;
  90
  91     if (!spbuf[0]) {
  92         for (x = spbuf, i = SPBUFLEN; i; x++, i--)
  93             *x = ' ';
  94     }
  95
  96     while (count > SPBUFLEN) {
  97         err = xfwrite(X, spbuf, SPBUFLEN);
  98         if (err)
  99             return err;
 100         count -= SPBUFLEN;
 101     }
 102     if (count > 0)
 103         return xfwrite(X, spbuf, count);
 104     return 0;
 105 }
 106
 107
 108 /* This function is a mostly-complete implementation of snprintf,
 109  * with the following features:
 110  *
 111  *   - Actually obeys the length limit, which (unfortunately) many
 112  *     implementations of snprintf do not.
 113  *
 114  *   - Supports all the standard format specifiers for integers
 115  *     (d, i, o, u, x, X), floating-point values (f, e, E, g, G),
 116  *     and strings and characters (c, s, %), plus a few unusual
 117  *     but useful ones described below.
 118  *
 119  *   - Supports all the standard flags (-, 0, +, space, #).  These
 120  *     flags are ignored if used when they are not appropriate.
 121  *
 122  *   - Supports the standard size modifiers for short (h), long (h),
 123  *     and double (L) arguments.  These modifiers are ignored if used
 124  *     when they are not appropriate.
 125  *
 126  *   - Supports minimum field width and precision, where appropriate,
 127  *     including the use of '*' to specify a value given as an argument
 128  *     instead of in the format string.  There is a maximum precision
 129  *     of 100 digits.
 130  *
 131  *   - At present, the 'p' specifier for printing pointers is not
 132  *     implemented, because it is inherently non-portable and thus
 133  *     can be implemented correctly only by the compiler's run-time
 134  *     library.
 135  *
 136  *   - Floating-point specifier (%e, %f, %g) are implemented by
 137  *     calling the standard sprintf, and thus may be unsafe.
 138  *
 139  *   - The '%...$' notation is used primarily when the format string
 140  *     is specified by the user, who knows but cannot change the order
 141  *     of the arguments.  Such usage is inherently dangerous and
 142  *     insecure; thus, it is not supported.
 143  *
 144  * The custom format specifier '%I' is supported.  This specifier
 145  * takes as its argument an unsigned long integer containing an
 146  * IPv4 address in network byte order.  The address is rendered
 147  * either as a hostname or as a dotted quad, as follows:
 148  *
 149  *   - If precision is nonzero or unspecified, a hostname lookup
 150  *     is attempted; if it is successful, the hostname is printed.
 151  *     If the hostname lookup fails, the address is printed in
 152  *     dotted-quad notation.
 153  *
 154  *   - If precision is explicitly specified as 0, then the hostname
 155  *     lookup is skipped, and dotted-quad notation is always used.
 156  *
 157  *   - If a hostname is to be printed:
 158  *     + The precision controls the maximum number of characters
 159  *       printed, as with %s.
 160  *     + If the '#' flag is specified, any letters in the hostname
 161  *       will be forced to lower case before printing.
 162  *     + If the '+' flag is specified, any letters in the hostname
 163  *       will be forced to upper case before printing.  If both
 164  *       '#' and '+' are given, the '+' flag will be ignored.
 165  *     + The '0' and ' ' flags have no effect.
 166  *
 167  *   - If a dotted quad is to be printed:
 168  *     + The precision has no effect; dotted quads are always
 169  *       7 to 12 characters in length, depending on the value
 170  *       to be printed and the format flags used.
 171  *     + If the '0' flag is given, each field (byte) of the address
 172  *       will be padded with '0' on the left to three digits.
 173  *     + If the ' ' flag is given, each field (byte) of the address
 174  *       will be padded with spaces on the left to three digits.  If
 175  *       both '0' and ' ' are given, the ' ' flag will be ignored.
 176  *     + The '#' and '+' flags have no effect.
 177  */
 178
 179 afs_uint32
 180 vxfprintf(XFILE * X, char *fmt, va_list ap)
 181 {
 182     unsigned int width, precision, haveprec, len;
 183     int ljust, plsign, spsign, altform, zfill;
 184     int hflag, lflag, count, *countp, j;
 185     char *x, *y, *lit = 0, xbuf[MAXPREC + 21], fbuf[20];
 186     struct hostent *he;
 187     struct in_addr ia;
 188     unsigned long UVAL;
 189     long SVAL, *lcountp;
 190     double FVAL;
 191     short *hcountp;
 192     afs_uint32 err;
 193
 194     count = 0;
 195     while (*fmt) {
 196         if (*fmt != '%') {
 197             if (!lit)
 198                 lit = fmt;
 199             fmt++;
 200             count++;
 201             continue;
 202         }
 203         if (lit) {
 204             if ((err = xfwrite(X, lit, fmt - lit)))
 205                 return err;
 206             lit = 0;
 207         }
 208
 209     /** Found a format specifier **/
 210         ljust = plsign = spsign = altform = zfill = 0;
 211         width = precision = haveprec = 0;
 212         hflag = lflag = 0;
 213         fmt++;
 214
 215         /* parse format flags */
 216         while (*fmt) {
 217             switch (*fmt) {
 218             case '-':
 219                 ljust = 1;
 220                 fmt++;
 221                 continue;       /* left justify */
 222             case '+':
 223                 plsign = 1;
 224                 fmt++;
 225                 continue;       /* use + or - */
 226             case ' ':
 227                 spsign = 1;
 228                 fmt++;
 229                 continue;       /* use space or - */
 230             case '#':
 231                 altform = 1;
 232                 fmt++;
 233                 continue;       /* alternate form */
 234             case '0':
 235                 zfill = 1;
 236                 fmt++;
 237                 continue;       /* pad with 0 */
 238             default:
 239                 break;
 240             }
 241             break;
 242         }
 243
 244         /* parse minimum width */
 245         if (*fmt == '*') {
 246             width = va_arg(ap, int);
 247             fmt++;
 248         } else
 249             while (isdigit(*fmt)) {
 250                 width = (width * 10) + (*fmt - '0');
 251                 fmt++;
 252             }
 253
 254         /* parse precision */
 255         if (*fmt == '.') {
 256             fmt++;
 257             haveprec = 1;
 258             if (*fmt == '*') {
 259                 precision = va_arg(ap, int);
 260                 fmt++;
 261             } else
 262                 while (isdigit(*fmt)) {
 263                     precision = (precision * 10) + (*fmt - '0');
 264                     fmt++;
 265                 }
 266         }
 267
 268         /* parse size flags */
 269         while (*fmt) {
 270             switch (*fmt) {
 271             case 'h':
 272                 hflag = 1;
 273                 fmt++;
 274                 continue;       /* short argument */
 275             case 'l':
 276                 lflag = 1;
 277                 fmt++;
 278                 continue;       /* long argument */
 279             default:
 280                 break;
 281             }
 282             break;
 283         }
 284
 285         /* parse format specifier */
 286         if (!*fmt)
 287             break;
 288         switch (*fmt++) {
 289         case 'e':
 290         case 'E':
 291         case 'f':
 292         case 'g':
 293         case 'G':
 294             FVAL = va_arg(ap, double);
 295             sprintf(fbuf, "%%%s%s.*L%c", plsign ? "+" : (spsign ? " " : ""),
 296                     altform ? "#" : "", fmt[-1]);
 297             if (!haveprec)
 298                 precision = 6;
 299             if (precision > MAXPREC)
 300                 precision = MAXPREC;
 301             sprintf(xbuf, fbuf, precision, FVAL);
 302             x = xbuf;
 303             len = strlen(x);
 304             break;
 305
 306         case 'i':
 307         case 'd':               /* signed decimal integer */
 308             if (lflag)
 309                 SVAL = va_arg(ap, long);
 310             else if (hflag)
 311                 SVAL = va_arg(ap, int);
 312             else
 313                 SVAL = va_arg(ap, int);
 314             UVAL = (SVAL < 0) ? -SVAL : SVAL;
 315
 316             if (SVAL < 0)
 317                 xbuf[0] = '-';
 318             else if (plsign)
 319                 xbuf[0] = '+';
 320             else if (spsign)
 321                 xbuf[0] = ' ';
 322             else
 323                 xbuf[0] = 0;
 324
 325             if (!haveprec) {
 326                 if (zfill && !ljust)
 327                     precision = width - !!xbuf[0];
 328                 else
 329                     precision = 1;
 330                 if (precision < 1 + !!xbuf[0])
 331                     precision = 1 + !!xbuf[0];
 332             }
 333             if (precision > MAXPREC)
 334                 precision = MAXPREC;
 335
 336             mkint(xbuf + 1, UVAL, 10, 0, precision);
 337             x = xbuf + !xbuf[0];
 338             len = strlen(x);
 339             break;
 340
 341
 342         case 'o':               /* unsigned octal integer */
 343             if (lflag)
 344                 UVAL = va_arg(ap, unsigned long);
 345             else if (hflag)
 346                 UVAL = va_arg(ap, unsigned int);
 347             else
 348                 UVAL = va_arg(ap, unsigned int);
 349
 350             xbuf[0] = '0';
 351
 352             if (!haveprec) {
 353                 if (zfill && !ljust)
 354                     precision = width;
 355                 else
 356                     precision = 1;
 357             }
 358             if (precision > MAXPREC)
 359                 precision = MAXPREC;
 360
 361             mkint(xbuf + 1, UVAL, 8, 0, precision);
 362             x = xbuf + (xbuf[1] == '0' || !altform);
 363             len = strlen(x);
 364             break;
 365
 366         case 'u':               /* unsigned decimal integer */
 367             if (lflag)
 368                 UVAL = va_arg(ap, unsigned long);
 369             else if (hflag)
 370                 UVAL = va_arg(ap, unsigned int);
 371             else
 372                 UVAL = va_arg(ap, unsigned int);
 373
 374             if (!haveprec) {
 375                 if (zfill && !ljust)
 376                     precision = width;
 377                 else
 378                     precision = 1;
 379             }
 380             if (precision > MAXPREC)
 381                 precision = MAXPREC;
 382
 383             mkint(xbuf, UVAL, 10, 0, precision);
 384             x = xbuf;
 385             len = strlen(x);
 386             break;
 387
 388         case 'x':
 389         case 'X':               /* unsigned hexadecimal integer */
 390             if (lflag)
 391                 UVAL = va_arg(ap, unsigned long);
 392             else if (hflag)
 393                 UVAL = va_arg(ap, unsigned int);
 394             else
 395                 UVAL = va_arg(ap, unsigned int);
 396
 397             xbuf[0] = '0';
 398             xbuf[1] = 'x';
 399
 400             if (!haveprec) {
 401                 if (zfill && !ljust)
 402                     precision = width;
 403                 else
 404                     precision = 1;
 405             }
 406             if (precision > MAXPREC)
 407                 precision = MAXPREC;
 408
 409             mkint(xbuf + 2, UVAL, 16, 0, precision);
 410             x = xbuf + ((altform && UVAL) ? 0 : 2);
 411             len = strlen(x);
 412             break;
 413
 414         case '%':               /* literal % */
 415             xbuf[0] = '%';
 416             xbuf[1] = 0;
 417             x = xbuf;
 418             len = 1;
 419             break;
 420
 421         case 'c':               /* character */
 422             xbuf[0] = va_arg(ap, int);
 423             xbuf[1] = 0;
 424             x = xbuf;
 425             len = 1;
 426             break;
 427
 428         case 's':               /* string */
 429             x = va_arg(ap, char *);
 430             if (!x)
 431                 x = "<null>";
 432             len = strlen(x);
 433             if (haveprec && precision < len)
 434                 len = precision;
 435             break;
 436
 437         case 'I':               /* IP address:
 438                                  * value is provided as a network-order unsigned long integer
 439                                  * precision specifies max hostname length, as for %s
 440                                  * if precision is explicitly 0, no hostname lookup is done
 441                                  * if 0fill specified, IPaddr fields are 0-filled to 3 digits
 442                                  * if spsign specified, IPaddr fields are space-filled to 3 digits
 443                                  */
 444             UVAL = va_arg(ap, unsigned long);
 445             ia.s_addr = UVAL;
 446             /* XXX: add support for an application-provided function
 447              * for doing hostname lookups.  We don't do it automatically
 448              * because on some platforms that would prevent us from
 449              * being fully statically linked.
 450              */
 451             if (haveprec && !precision)
 452                 he = 0;
 453             else
 454                 he = gethostbyaddr((char *)&ia, 4, AF_INET);
 455             if (he) {
 456                 x = he->h_name;
 457                 len = strlen(x);
 458                 if (haveprec && precision < len)
 459                     len = precision;
 460                 if (altform) {
 461                     for (y = x; *y; y++)
 462                         if (isupper(*y))
 463                             *y = tolower(*y);
 464                         else if (plsign)
 465                             for (y = x; *y; y++)
 466                                 if (islower(*y))
 467                                     *y = toupper(*y);
 468                 }
 469             } else {
 470                 UVAL = ntohl(UVAL);
 471                 if (zfill)
 472                     x = "%03u.%03u.%03u.%03u";
 473                 else if (spsign)
 474                     x = "%3u.%3u.%3u.%3u";
 475                 else
 476                     x = "%u.%u.%u.%u";
 477                 sprintf(xbuf, x, (UVAL & 0xff000000) >> 24,
 478                         (UVAL & 0x00ff0000) >> 16, (UVAL & 0x0000ff00) >> 8,
 479                         (UVAL & 0x000000ff));
 480                 x = xbuf;
 481                 len = strlen(xbuf);
 482             }
 483             break;
 484
 485         case 'n':               /* report count so far */
 486             if (lflag) {
 487                 lcountp = va_arg(ap, long *);
 488                 *lcountp = count;
 489             } else if (hflag) {
 490                 hcountp = va_arg(ap, short *);
 491                 *hcountp = count;
 492             } else {
 493                 countp = va_arg(ap, int *);
 494                 *countp = count;
 495             }
 496             continue;
 497
 498         default:                /* unknown specifier */
 499             continue;
 500         }
 501
 502         /* render the results */
 503         if (!width)
 504             width = len;
 505         j = width - len;
 506         if (j > 0)
 507             count += j;
 508         count += len;
 509
 510         if (!ljust && (err = wsp(X, j)))
 511             return err;
 512         if ((err = xfwrite(X, x, len)))
 513             return err;
 514         if (ljust && (err = wsp(X, j)))
 515             return err;
 516     }
 517     if (lit && (err = xfwrite(X, lit, fmt - lit)))
 518         return err;
 519     return 0;
 520 }
 521
 522
 523 afs_uint32
 524 xfprintf(XFILE * X, char *fmt, ...)
 525 {
 526     va_list ap;
 527     afs_uint32 err;
 528
 529     va_start(ap, fmt);
 530     err = vxfprintf(X, fmt, ap);
 531     va_end(ap);
 532     return err;
 533 }