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 57 typedef enum { 58 number_all, /* number all lines */ 59 number_nonempty, /* number non-empty lines */ 60 number_none, /* no line numbering */ 61 number_regex /* number lines matching regular expression */ 62 } numbering_type; 63 64 struct numbering_property { 65 const char * const name; /* for diagnostics */ 66 numbering_type type; /* numbering type */ 67 regex_t expr; /* for type == number_regex */ 68 }; 69 70 /* line numbering formats */ 71 #define FORMAT_LN "%-*d" /* left justified, leading zeros suppressed */ 72 #define FORMAT_RN "%*d" /* right justified, leading zeros suppressed */ 73 #define FORMAT_RZ "%0*d" /* right justified, leading zeros kept */ 74 75 #define FOOTER 0 76 #define BODY 1 77 #define HEADER 2 78 #define NP_LAST HEADER 79 80 static struct numbering_property numbering_properties[NP_LAST + 1] = { 81 { "footer", number_none }, 82 { "body", number_nonempty }, 83 { "header", number_none } 84 }; 85 86 #define max(a, b) ((a) > (b) ? (a) : (b)) 87 88 /* 89 * Maximum number of characters required for a decimal representation of a 90 * (signed) int; courtesy of tzcode. 91 */ 92 #define INT_STRLEN_MAXIMUM \ 93 ((sizeof (int) * CHAR_BIT - 1) * 302 / 1000 + 2) 94 95 static void filter(void); 96 int main(int, char *[]); 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 /* 112 * Configurable parameters. 113 */ 114 /* delimiter characters that indicate the start of a logical page section */ 115 static char delim[2] = { '\\', ':' }; 116 117 /* line numbering format */ 118 static const char *format = FORMAT_RN; 119 120 /* increment value used to number logical page lines */ 121 static int incr = 1; 122 123 /* number of adjacent blank lines to be considered (and numbered) as one */ 124 static unsigned int nblank = 1; 125 126 /* whether to restart numbering at logical page delimiters */ 127 static int restart = 1; 128 129 /* characters used in separating the line number and the corrsp. text line */ 130 static const char *sep = "\t"; 131 132 /* initial value used to number logical page lines */ 133 static int startnum = 1; 134 135 /* number of characters to be used for the line number */ 136 /* should be unsigned but required signed by `*' precision conversion */ 137 static int width = 6; 138 139 140 int 141 main(argc, argv) 142 int argc; 143 char *argv[]; 144 { 145 int c; 146 long val; 147 unsigned long uval; 148 char *ep; 149 size_t intbuffersize; 150 151 (void)setlocale(LC_ALL, ""); 152 153 while ((c = getopt(argc, argv, "pb:d:f:h:i:l:n:s:v:w:")) != -1) { 154 switch (c) { 155 case 'p': 156 restart = 0; 157 break; 158 case 'b': 159 parse_numbering(optarg, BODY); 160 break; 161 case 'd': 162 if (optarg[0] != '\0') 163 delim[0] = optarg[0]; 164 if (optarg[1] != '\0') 165 delim[1] = optarg[1]; 166 /* at most two delimiter characters */ 167 if (optarg[2] != '\0') { 168 errx(EXIT_FAILURE, 169 "invalid delim argument -- %s", 170 optarg); 171 /* NOTREACHED */ 172 } 173 break; 174 case 'f': 175 parse_numbering(optarg, FOOTER); 176 break; 177 case 'h': 178 parse_numbering(optarg, HEADER); 179 break; 180 case 'i': 181 errno = 0; 182 val = strtol(optarg, &ep, 10); 183 if ((ep != NULL && *ep != '\0') || 184 ((val == LONG_MIN || val == LONG_MAX) && errno != 0)) 185 errx(EXIT_FAILURE, 186 "invalid incr argument -- %s", optarg); 187 incr = (int)val; 188 break; 189 case 'l': 190 errno = 0; 191 uval = strtoul(optarg, &ep, 10); 192 if ((ep != NULL && *ep != '\0') || 193 (uval == ULONG_MAX && errno != 0)) 194 errx(EXIT_FAILURE, 195 "invalid num argument -- %s", optarg); 196 nblank = (unsigned int)uval; 197 break; 198 case 'n': 199 if (strcmp(optarg, "ln") == 0) { 200 format = FORMAT_LN; 201 } else if (strcmp(optarg, "rn") == 0) { 202 format = FORMAT_RN; 203 } else if (strcmp(optarg, "rz") == 0) { 204 format = FORMAT_RZ; 205 } else 206 errx(EXIT_FAILURE, 207 "illegal format -- %s", optarg); 208 break; 209 case 's': 210 sep = optarg; 211 break; 212 case 'v': 213 errno = 0; 214 val = strtol(optarg, &ep, 10); 215 if ((ep != NULL && *ep != '\0') || 216 ((val == LONG_MIN || val == LONG_MAX) && errno != 0)) 217 errx(EXIT_FAILURE, 218 "invalid startnum value -- %s", optarg); 219 startnum = (int)val; 220 break; 221 case 'w': 222 errno = 0; 223 val = strtol(optarg, &ep, 10); 224 if ((ep != NULL && *ep != '\0') || 225 ((val == LONG_MIN || val == LONG_MAX) && errno != 0)) 226 errx(EXIT_FAILURE, 227 "invalid width value -- %s", optarg); 228 width = (int)val; 229 if (!(width > 0)) 230 errx(EXIT_FAILURE, 231 "width argument must be > 0 -- %d", 232 width); 233 break; 234 case '?': 235 default: 236 usage(); 237 /* NOTREACHED */ 238 } 239 } 240 argc -= optind; 241 argv += optind; 242 243 switch (argc) { 244 case 0: 245 break; 246 case 1: 247 if (freopen(argv[0], "r", stdin) == NULL) 248 err(EXIT_FAILURE, "%s", argv[0]); 249 break; 250 default: 251 usage(); 252 /* NOTREACHED */ 253 } 254 255 /* Determine the maximum input line length to operate on. */ 256 if ((val = sysconf(_SC_LINE_MAX)) == -1) /* ignore errno */ 257 val = LINE_MAX; 258 /* Allocate sufficient buffer space (including the terminating NUL). */ 259 buffersize = (size_t)val + 1; 260 if ((buffer = malloc(buffersize)) == NULL) 261 err(EXIT_FAILURE, "cannot allocate input line buffer"); 262 263 /* Allocate a buffer suitable for preformatting line number. */ 264 intbuffersize = max(INT_STRLEN_MAXIMUM, width) + 1; /* NUL */ 265 if ((intbuffer = malloc(intbuffersize)) == NULL) 266 err(EXIT_FAILURE, "cannot allocate preformatting buffer"); 267 268 /* Do the work. */ 269 filter(); 270 271 exit(EXIT_SUCCESS); 272 /* NOTREACHED */ 273 } 274 275 static void 276 filter() 277 { 278 int line; /* logical line number */ 279 int section; /* logical page section */ 280 unsigned int adjblank; /* adjacent blank lines */ 281 int consumed; /* intbuffer measurement */ 282 int donumber, idx; 283 284 adjblank = 0; 285 line = startnum; 286 section = BODY; 287 #ifdef __GNUC__ 288 (void)&donumber; /* avoid bogus `uninitialized' warning */ 289 #endif 290 291 while (fgets(buffer, (int)buffersize, stdin) != NULL) { 292 for (idx = FOOTER; idx <= NP_LAST; idx++) { 293 /* Does it look like a delimiter? */ 294 if (buffer[2 * idx + 0] == delim[0] && 295 buffer[2 * idx + 1] == delim[1]) { 296 /* Was this the whole line? */ 297 if (buffer[2 * idx + 2] == '\n') { 298 section = idx; 299 adjblank = 0; 300 if (restart) 301 line = startnum; 302 goto nextline; 303 } 304 } else { 305 break; 306 } 307 } 308 309 switch (numbering_properties[section].type) { 310 case number_all: 311 /* 312 * Doing this for number_all only is disputable, but 313 * the standard expresses an explicit dependency on 314 * `-b a' etc. 315 */ 316 if (buffer[0] == '\n' && ++adjblank < nblank) 317 donumber = 0; 318 else 319 donumber = 1, adjblank = 0; 320 break; 321 case number_nonempty: 322 donumber = (buffer[0] != '\n'); 323 break; 324 case number_none: 325 donumber = 0; 326 break; 327 case number_regex: 328 donumber = 329 (regexec(&numbering_properties[section].expr, 330 buffer, 0, NULL, 0) == 0); 331 break; 332 } 333 334 if (donumber) { 335 /* Note: sprintf() is safe here. */ 336 consumed = sprintf(intbuffer, format, width, line); 337 (void)printf("%s", 338 intbuffer + max(0, consumed - width)); 339 line += incr; 340 } else { 341 (void)printf("%*s", width, ""); 342 } 343 (void)printf("%s%s", sep, buffer); 344 345 if (ferror(stdout)) 346 err(EXIT_FAILURE, "output error"); 347 nextline: 348 ; 349 } 350 351 if (ferror(stdin)) 352 err(EXIT_FAILURE, "input error"); 353 } 354 355 /* 356 * Various support functions. 357 */ 358 359 static void 360 parse_numbering(argstr, section) 361 const char *argstr; 362 int section; 363 { 364 int error; 365 char errorbuf[NL_TEXTMAX]; 366 367 switch (argstr[0]) { 368 case 'a': 369 numbering_properties[section].type = number_all; 370 break; 371 case 'n': 372 numbering_properties[section].type = number_none; 373 break; 374 case 't': 375 numbering_properties[section].type = number_nonempty; 376 break; 377 case 'p': 378 /* If there was a previous expression, throw it away. */ 379 if (numbering_properties[section].type == number_regex) 380 regfree(&numbering_properties[section].expr); 381 else 382 numbering_properties[section].type = number_regex; 383 384 /* Compile/validate the supplied regular expression. */ 385 if ((error = regcomp(&numbering_properties[section].expr, 386 &argstr[1], REG_NEWLINE|REG_NOSUB)) != 0) { 387 (void)regerror(error, 388 &numbering_properties[section].expr, 389 errorbuf, sizeof (errorbuf)); 390 errx(EXIT_FAILURE, 391 "%s expr: %s -- %s", 392 numbering_properties[section].name, errorbuf, 393 &argstr[1]); 394 } 395 break; 396 default: 397 errx(EXIT_FAILURE, 398 "illegal %s line numbering type -- %s", 399 numbering_properties[section].name, argstr); 400 } 401 } 402 403 static void 404 usage() 405 { 406 407 (void)fprintf(stderr, "usage: nl [-p] [-b type] [-d delim] [-f type] \ 408 [-h type] [-i incr] [-l num]\n\t[-n format] [-s sep] [-v startnum] [-w width] \ 409 [file]\n"); 410 exit(EXIT_FAILURE); 411 } 412