usr.bin/nl/nl.c

   1 /*-
   2  * Copyright (c) 1999 The NetBSD Foundation, Inc.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to The NetBSD Foundation
   6  * by Klaus Klein.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *        This product includes software developed by the NetBSD
  19  *        Foundation, Inc. and its contributors.
  20  * 4. Neither the name of The NetBSD Foundation nor the names of its
  21  *    contributors may be used to endorse or promote products derived
  22  *    from this software without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  25  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  26  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  27  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  28  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include <sys/cdefs.h>
  38 #ifndef lint
  39 __COPYRIGHT(
  40 "@(#) Copyright (c) 1999\
  41  The NetBSD Foundation, Inc.  All rights reserved.");
  42 __RCSID("$FreeBSD$");
  43 #endif
  44
  45 #include <sys/types.h>
  46
  47 #include <err.h>
  48 #include <errno.h>
  49 #include <limits.h>
  50 #include <locale.h>
  51 #include <regex.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <unistd.h>
  56 #include <wchar.h>
  57
  58 typedef enum {
  59         number_all,             /* number all lines */
  60         number_nonempty,        /* number non-empty lines */
  61         number_none,            /* no line numbering */
  62         number_regex            /* number lines matching regular expression */
  63 } numbering_type;
  64
  65 struct numbering_property {
  66         const char * const      name;           /* for diagnostics */
  67         numbering_type          type;           /* numbering type */
  68         regex_t                 expr;           /* for type == number_regex */
  69 };
  70
  71 /* line numbering formats */
  72 #define FORMAT_LN       "%-*d"  /* left justified, leading zeros suppressed */
  73 #define FORMAT_RN       "%*d"   /* right justified, leading zeros suppressed */
  74 #define FORMAT_RZ       "%0*d"  /* right justified, leading zeros kept */
  75
  76 #define FOOTER          0
  77 #define BODY            1
  78 #define HEADER          2
  79 #define NP_LAST         HEADER
  80
  81 static struct numbering_property numbering_properties[NP_LAST + 1] = {
  82         { "footer",     number_none     },
  83         { "body",       number_nonempty },
  84         { "header",     number_none     }
  85 };
  86
  87 #define max(a, b)       ((a) > (b) ? (a) : (b))
  88
  89 /*
  90  * Maximum number of characters required for a decimal representation of a
  91  * (signed) int; courtesy of tzcode.
  92  */
  93 #define INT_STRLEN_MAXIMUM \
  94         ((sizeof (int) * CHAR_BIT - 1) * 302 / 1000 + 2)
  95
  96 static void     filter(void);
  97 static void     parse_numbering(const char *, int);
  98 static void     usage(void);
  99
 100 /*
 101  * Pointer to dynamically allocated input line buffer, and its size.
 102  */
 103 static char *buffer;
 104 static size_t buffersize;
 105
 106 /*
 107  * Dynamically allocated buffer suitable for string representation of ints.
 108  */
 109 static char *intbuffer;
 110
 111 /* delimiter characters that indicate the start of a logical page section */
 112 static char delim[2 * MB_LEN_MAX];
 113 static int delimlen;
 114
 115 /*
 116  * Configurable parameters.
 117  */
 118
 119 /* line numbering format */
 120 static const char *format = FORMAT_RN;
 121
 122 /* increment value used to number logical page lines */
 123 static int incr = 1;
 124
 125 /* number of adjacent blank lines to be considered (and numbered) as one */
 126 static unsigned int nblank = 1;
 127
 128 /* whether to restart numbering at logical page delimiters */
 129 static int restart = 1;
 130
 131 /* characters used in separating the line number and the corrsp. text line */
 132 static const char *sep = "\t";
 133
 134 /* initial value used to number logical page lines */
 135 static int startnum = 1;
 136
 137 /* number of characters to be used for the line number */
 138 /* should be unsigned but required signed by `*' precision conversion */
 139 static int width = 6;
 140
 141
 142 int
 143 main(argc, argv)
 144         int argc;
 145         char *argv[];
 146 {
 147         int c;
 148         long val;
 149         unsigned long uval;
 150         char *ep;
 151         size_t intbuffersize, clen;
 152         char delim1[MB_LEN_MAX] = { '\\' }, delim2[MB_LEN_MAX] = { ':' };
 153         size_t delim1len = 1, delim2len = 1;
 154
 155         (void)setlocale(LC_ALL, "");
 156
 157         while ((c = getopt(argc, argv, "pb:d:f:h:i:l:n:s:v:w:")) != -1) {
 158                 switch (c) {
 159                 case 'p':
 160                         restart = 0;
 161                         break;
 162                 case 'b':
 163                         parse_numbering(optarg, BODY);
 164                         break;
 165                 case 'd':
 166                         clen = mbrlen(optarg, MB_CUR_MAX, NULL);
 167                         if (clen == (size_t)-1 || clen == (size_t)-2)
 168                                 errc(EXIT_FAILURE, EILSEQ, NULL);
 169                         if (clen != 0) {
 170                                 memcpy(delim1, optarg, delim1len = clen);
 171                                 clen = mbrlen(optarg + delim1len,
 172                                     MB_CUR_MAX, NULL);
 173                                 if (clen == (size_t)-1 ||
 174                                     clen == (size_t)-2)
 175                                         errc(EXIT_FAILURE, EILSEQ, NULL);
 176                                 if (clen != 0) {
 177                                         memcpy(delim2, optarg + delim1len,
 178                                             delim2len = clen);
 179                                 if (optarg[delim1len + clen] != '\0')
 180                                         errx(EXIT_FAILURE,
 181                                             "invalid delim argument -- %s",
 182                                             optarg);
 183                                 }
 184                         }
 185                         break;
 186                 case 'f':
 187                         parse_numbering(optarg, FOOTER);
 188                         break;
 189                 case 'h':
 190                         parse_numbering(optarg, HEADER);
 191                         break;
 192                 case 'i':
 193                         errno = 0;
 194                         val = strtol(optarg, &ep, 10);
 195                         if ((ep != NULL && *ep != '\0') ||
 196                          ((val == LONG_MIN || val == LONG_MAX) && errno != 0))
 197                                 errx(EXIT_FAILURE,
 198                                     "invalid incr argument -- %s", optarg);
 199                         incr = (int)val;
 200                         break;
 201                 case 'l':
 202                         errno = 0;
 203                         uval = strtoul(optarg, &ep, 10);
 204                         if ((ep != NULL && *ep != '\0') ||
 205                             (uval == ULONG_MAX && errno != 0))
 206                                 errx(EXIT_FAILURE,
 207                                     "invalid num argument -- %s", optarg);
 208                         nblank = (unsigned int)uval;
 209                         break;
 210                 case 'n':
 211                         if (strcmp(optarg, "ln") == 0) {
 212                                 format = FORMAT_LN;
 213                         } else if (strcmp(optarg, "rn") == 0) {
 214                                 format = FORMAT_RN;
 215                         } else if (strcmp(optarg, "rz") == 0) {
 216                                 format = FORMAT_RZ;
 217                         } else
 218                                 errx(EXIT_FAILURE,
 219                                     "illegal format -- %s", optarg);
 220                         break;
 221                 case 's':
 222                         sep = optarg;
 223                         break;
 224                 case 'v':
 225                         errno = 0;
 226                         val = strtol(optarg, &ep, 10);
 227                         if ((ep != NULL && *ep != '\0') ||
 228                          ((val == LONG_MIN || val == LONG_MAX) && errno != 0))
 229                                 errx(EXIT_FAILURE,
 230                                     "invalid startnum value -- %s", optarg);
 231                         startnum = (int)val;
 232                         break;
 233                 case 'w':
 234                         errno = 0;
 235                         val = strtol(optarg, &ep, 10);
 236                         if ((ep != NULL && *ep != '\0') ||
 237                          ((val == LONG_MIN || val == LONG_MAX) && errno != 0))
 238                                 errx(EXIT_FAILURE,
 239                                     "invalid width value -- %s", optarg);
 240                         width = (int)val;
 241                         if (!(width > 0))
 242                                 errx(EXIT_FAILURE,
 243                                     "width argument must be > 0 -- %d",
 244                                     width);
 245                         break;
 246                 case '?':
 247                 default:
 248                         usage();
 249                         /* NOTREACHED */
 250                 }
 251         }
 252         argc -= optind;
 253         argv += optind;
 254
 255         switch (argc) {
 256         case 0:
 257                 break;
 258         case 1:
 259                 if (freopen(argv[0], "r", stdin) == NULL)
 260                         err(EXIT_FAILURE, "%s", argv[0]);
 261                 break;
 262         default:
 263                 usage();
 264                 /* NOTREACHED */
 265         }
 266
 267         /* Generate the delimiter sequence */
 268         memcpy(delim, delim1, delim1len);
 269         memcpy(delim + delim1len, delim2, delim2len);
 270         delimlen = delim1len + delim2len;
 271
 272         /* Determine the maximum input line length to operate on. */
 273         if ((val = sysconf(_SC_LINE_MAX)) == -1) /* ignore errno */
 274                 val = LINE_MAX;
 275         /* Allocate sufficient buffer space (including the terminating NUL). */
 276         buffersize = (size_t)val + 1;
 277         if ((buffer = malloc(buffersize)) == NULL)
 278                 err(EXIT_FAILURE, "cannot allocate input line buffer");
 279
 280         /* Allocate a buffer suitable for preformatting line number. */
 281         intbuffersize = max(INT_STRLEN_MAXIMUM, width) + 1;     /* NUL */
 282         if ((intbuffer = malloc(intbuffersize)) == NULL)
 283                 err(EXIT_FAILURE, "cannot allocate preformatting buffer");
 284
 285         /* Do the work. */
 286         filter();
 287
 288         exit(EXIT_SUCCESS);
 289         /* NOTREACHED */
 290 }
 291
 292 static void
 293 filter()
 294 {
 295         int line;               /* logical line number */
 296         int section;            /* logical page section */
 297         unsigned int adjblank;  /* adjacent blank lines */
 298         int consumed;           /* intbuffer measurement */
 299         int donumber = 0, idx;
 300
 301         adjblank = 0;
 302         line = startnum;
 303         section = BODY;
 304
 305         while (fgets(buffer, (int)buffersize, stdin) != NULL) {
 306                 for (idx = FOOTER; idx <= NP_LAST; idx++) {
 307                         /* Does it look like a delimiter? */
 308                         if (memcmp(buffer + delimlen * idx, delim,
 309                             delimlen) == 0) {
 310                                 /* Was this the whole line? */
 311                                 if (buffer[delimlen * (idx + 1)] == '\n') {
 312                                         section = idx;
 313                                         adjblank = 0;
 314                                         if (restart)
 315                                                 line = startnum;
 316                                         goto nextline;
 317                                 }
 318                         } else {
 319                                 break;
 320                         }
 321                 }
 322
 323                 switch (numbering_properties[section].type) {
 324                 case number_all:
 325                         /*
 326                          * Doing this for number_all only is disputable, but
 327                          * the standard expresses an explicit dependency on
 328                          * `-b a' etc.
 329                          */
 330                         if (buffer[0] == '\n' && ++adjblank < nblank)
 331                                 donumber = 0;
 332                         else
 333                                 donumber = 1, adjblank = 0;
 334                         break;
 335                 case number_nonempty:
 336                         donumber = (buffer[0] != '\n');
 337                         break;
 338                 case number_none:
 339                         donumber = 0;
 340                         break;
 341                 case number_regex:
 342                         donumber =
 343                             (regexec(&numbering_properties[section].expr,
 344                             buffer, 0, NULL, 0) == 0);
 345                         break;
 346                 }
 347
 348                 if (donumber) {
 349                         /* Note: sprintf() is safe here. */
 350                         consumed = sprintf(intbuffer, format, width, line);
 351                         (void)printf("%s",
 352                             intbuffer + max(0, consumed - width));
 353                         line += incr;
 354                 } else {
 355                         (void)printf("%*s", width, "");
 356                 }
 357                 (void)printf("%s%s", sep, buffer);
 358
 359                 if (ferror(stdout))
 360                         err(EXIT_FAILURE, "output error");
 361 nextline:
 362                 ;
 363         }
 364
 365         if (ferror(stdin))
 366                 err(EXIT_FAILURE, "input error");
 367 }
 368
 369 /*
 370  * Various support functions.
 371  */
 372
 373 static void
 374 parse_numbering(argstr, section)
 375         const char *argstr;
 376         int section;
 377 {
 378         int error;
 379         char errorbuf[NL_TEXTMAX];
 380
 381         switch (argstr[0]) {
 382         case 'a':
 383                 numbering_properties[section].type = number_all;
 384                 break;
 385         case 'n':
 386                 numbering_properties[section].type = number_none;
 387                 break;
 388         case 't':
 389                 numbering_properties[section].type = number_nonempty;
 390                 break;
 391         case 'p':
 392                 /* If there was a previous expression, throw it away. */
 393                 if (numbering_properties[section].type == number_regex)
 394                         regfree(&numbering_properties[section].expr);
 395                 else
 396                         numbering_properties[section].type = number_regex;
 397
 398                 /* Compile/validate the supplied regular expression. */
 399                 if ((error = regcomp(&numbering_properties[section].expr,
 400                     &argstr[1], REG_NEWLINE|REG_NOSUB)) != 0) {
 401                         (void)regerror(error,
 402                             &numbering_properties[section].expr,
 403                             errorbuf, sizeof (errorbuf));
 404                         errx(EXIT_FAILURE,
 405                             "%s expr: %s -- %s",
 406                             numbering_properties[section].name, errorbuf,
 407                             &argstr[1]);
 408                 }
 409                 break;
 410         default:
 411                 errx(EXIT_FAILURE,
 412                     "illegal %s line numbering type -- %s",
 413                     numbering_properties[section].name, argstr);
 414         }
 415 }
 416
 417 static void
 418 usage()
 419 {
 420
 421         (void)fprintf(stderr,
 422 "usage: nl [-p] [-b type] [-d delim] [-f type] [-h type] [-i incr] [-l num]\n"
 423 "          [-n format] [-s sep] [-v startnum] [-w width] [file]\n");
 424         exit(EXIT_FAILURE);
 425 }