nl.c revision 1.13
1 /* $NetBSD: nl.c,v 1.13 2020/12/22 17:50:55 ginsbach Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1999\ 35 The NetBSD Foundation, Inc. All rights reserved."); 36 __RCSID("$NetBSD: nl.c,v 1.13 2020/12/22 17:50:55 ginsbach Exp $"); 37 #endif 38 39 #include <errno.h> 40 #include <limits.h> 41 #include <locale.h> 42 #include <regex.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 #include <err.h> 48 49 typedef enum { 50 number_all, /* number all lines */ 51 number_nonempty, /* number non-empty lines */ 52 number_none, /* no line numbering */ 53 number_regex /* number lines matching regular expression */ 54 } numbering_type; 55 56 struct numbering_property { 57 const char * const name; /* for diagnostics */ 58 numbering_type type; /* numbering type */ 59 regex_t expr; /* for type == number_regex */ 60 }; 61 62 /* line numbering formats */ 63 #define FORMAT_LN "%-*d" /* left justified, leading zeros suppressed */ 64 #define FORMAT_RN "%*d" /* right justified, leading zeros suppressed */ 65 #define FORMAT_RZ "%0*d" /* right justified, leading zeros kept */ 66 67 #define FOOTER 0 68 #define BODY 1 69 #define HEADER 2 70 #define NP_LAST HEADER 71 72 static struct numbering_property numbering_properties[NP_LAST + 1] = { 73 { "footer", number_none, { 0, 0, 0, 0 } }, 74 { "body", number_nonempty, { 0, 0, 0, 0 } }, 75 { "header", number_none, { 0, 0, 0, 0 } }, 76 }; 77 78 #define max(a, b) ((a) > (b) ? (a) : (b)) 79 80 /* 81 * Maximum number of characters required for a decimal representation of a 82 * (signed) int; courtesy of tzcode. 83 */ 84 #define INT_STRLEN_MAXIMUM \ 85 ((sizeof (int) * CHAR_BIT - 1) * 302 / 1000 + 2) 86 87 static void filter(void); 88 static void parse_numbering(const char *, int); 89 static void usage(void) __attribute__((__noreturn__)); 90 91 /* 92 * Pointer to dynamically allocated input line buffer, and its size. 93 */ 94 static char *buffer; 95 static size_t buffersize; 96 97 /* 98 * Dynamically allocated buffer suitable for string representation of ints. 99 */ 100 static char *intbuffer; 101 static size_t intbuffersize; 102 103 /* 104 * Configurable parameters. 105 */ 106 /* delimiter characters that indicate the start of a logical page section */ 107 static char delim[2] = { '\\', ':' }; 108 109 /* line numbering format */ 110 static const char *format = FORMAT_RN; 111 112 /* increment value used to number logical page lines */ 113 static int incr = 1; 114 115 /* number of adjacent blank lines to be considered (and numbered) as one */ 116 static unsigned int nblank = 1; 117 118 /* whether to restart numbering at logical page delimiters */ 119 static int restart = 1; 120 121 /* characters used in separating the line number and the corrsp. text line */ 122 static const char *sep = "\t"; 123 124 /* initial value used to number logical page lines */ 125 static int startnum = 1; 126 127 /* number of characters to be used for the line number */ 128 /* should be unsigned but required signed by `*' precision conversion */ 129 static int width = 6; 130 131 132 int 133 main(int argc, char *argv[]) 134 { 135 int c; 136 long val; 137 unsigned long uval; 138 char *ep; 139 140 (void)setlocale(LC_ALL, ""); 141 142 /* 143 * Note: this implementation strictly conforms to the XBD Utility 144 * Syntax Guidelines and does not permit the optional `file' operand 145 * to be intermingled with the options, which is defined in the 146 * XCU specification (Issue 5) but declared an obsolescent feature that 147 * will be removed from a future issue. It shouldn't matter, though. 148 */ 149 while ((c = getopt(argc, argv, "pb:d:f:h:i:l:n:s:v:w:")) != -1) { 150 switch (c) { 151 case 'p': 152 restart = 0; 153 break; 154 case 'b': 155 parse_numbering(optarg, BODY); 156 break; 157 case 'd': 158 if (optarg[0] != '\0') 159 delim[0] = optarg[0]; 160 if (optarg[1] != '\0') 161 delim[1] = optarg[1]; 162 /* at most two delimiter characters */ 163 if (optarg[2] != '\0') { 164 errx(EXIT_FAILURE, 165 "invalid delim argument -- %s", 166 optarg); 167 /* NOTREACHED */ 168 } 169 break; 170 case 'f': 171 parse_numbering(optarg, FOOTER); 172 break; 173 case 'h': 174 parse_numbering(optarg, HEADER); 175 break; 176 case 'i': 177 errno = 0; 178 val = strtol(optarg, &ep, 10); 179 if ((ep != NULL && *ep != '\0') || 180 ((val == LONG_MIN || val == LONG_MAX) && errno != 0)) 181 errx(EXIT_FAILURE, 182 "invalid incr argument -- %s", optarg); 183 incr = (int)val; 184 break; 185 case 'l': 186 errno = 0; 187 uval = strtoul(optarg, &ep, 10); 188 if ((ep != NULL && *ep != '\0') || 189 (uval == ULONG_MAX && errno != 0)) 190 errx(EXIT_FAILURE, 191 "invalid num argument -- %s", optarg); 192 nblank = (unsigned int)uval; 193 break; 194 case 'n': 195 if (strcmp(optarg, "ln") == 0) { 196 format = FORMAT_LN; 197 } else if (strcmp(optarg, "rn") == 0) { 198 format = FORMAT_RN; 199 } else if (strcmp(optarg, "rz") == 0) { 200 format = FORMAT_RZ; 201 } else 202 errx(EXIT_FAILURE, 203 "illegal format -- %s", optarg); 204 break; 205 case 's': 206 sep = optarg; 207 break; 208 case 'v': 209 errno = 0; 210 val = strtol(optarg, &ep, 10); 211 if ((ep != NULL && *ep != '\0') || 212 ((val == LONG_MIN || val == LONG_MAX) && errno != 0)) 213 errx(EXIT_FAILURE, 214 "invalid startnum value -- %s", optarg); 215 startnum = (int)val; 216 break; 217 case 'w': 218 errno = 0; 219 val = strtol(optarg, &ep, 10); 220 if ((ep != NULL && *ep != '\0') || 221 ((val == LONG_MIN || val == LONG_MAX) && errno != 0)) 222 errx(EXIT_FAILURE, 223 "invalid width value -- %s", optarg); 224 width = (int)val; 225 if (!(width > 0)) 226 errx(EXIT_FAILURE, 227 "width argument must be > 0 -- %d", 228 width); 229 break; 230 case '?': 231 default: 232 usage(); 233 /* NOTREACHED */ 234 } 235 } 236 argc -= optind; 237 argv += optind; 238 239 switch (argc) { 240 case 0: 241 break; 242 case 1: 243 if (strcmp(argv[0], "-") != 0 && 244 freopen(argv[0], "r", stdin) == NULL) 245 err(EXIT_FAILURE, "Cannot open `%s'", argv[0]); 246 break; 247 default: 248 usage(); 249 /* NOTREACHED */ 250 } 251 252 /* Determine the maximum input line length to operate on. */ 253 if ((val = sysconf(_SC_LINE_MAX)) == -1) /* ignore errno */ 254 val = LINE_MAX; 255 /* Allocate sufficient buffer space (including the terminating NUL). */ 256 buffersize = (size_t)val + 1; 257 if ((buffer = malloc(buffersize)) == NULL) 258 err(EXIT_FAILURE, "Cannot allocate input line buffer"); 259 260 /* Allocate a buffer suitable for preformatting line number. */ 261 intbuffersize = max((int)INT_STRLEN_MAXIMUM, width) + 1; /* NUL */ 262 if ((intbuffer = malloc(intbuffersize)) == NULL) 263 err(EXIT_FAILURE, "cannot allocate preformatting buffer"); 264 265 /* Do the work. */ 266 filter(); 267 268 return EXIT_SUCCESS; 269 /* NOTREACHED */ 270 } 271 272 static void 273 filter(void) 274 { 275 int line; /* logical line number */ 276 int section; /* logical page section */ 277 unsigned int adjblank; /* adjacent blank lines */ 278 int consumed; /* intbuffer measurement */ 279 int donumber, idx; 280 281 adjblank = 0; 282 line = startnum; 283 section = BODY; 284 #ifdef __GNUC__ 285 donumber = 0; /* avoid bogus `uninitialized' warning */ 286 #endif 287 288 while (fgets(buffer, (int)buffersize, stdin) != NULL) { 289 for (idx = FOOTER; idx <= NP_LAST; idx++) { 290 /* Does it look like a delimiter? */ 291 if (buffer[2 * idx + 0] == delim[0] && 292 buffer[2 * idx + 1] == delim[1]) { 293 /* Was this the whole line? */ 294 if (buffer[2 * idx + 2] == '\n') { 295 section = idx; 296 adjblank = 0; 297 if (restart) 298 line = startnum; 299 goto nextline; 300 } 301 } else { 302 break; 303 } 304 } 305 306 switch (numbering_properties[section].type) { 307 case number_all: 308 /* 309 * Doing this for number_all only is disputable, but 310 * the standard expresses an explicit dependency on 311 * `-b a' etc. 312 */ 313 if (buffer[0] == '\n' && ++adjblank < nblank) 314 donumber = 0; 315 else 316 donumber = 1, adjblank = 0; 317 break; 318 case number_nonempty: 319 donumber = (buffer[0] != '\n'); 320 break; 321 case number_none: 322 donumber = 0; 323 break; 324 case number_regex: 325 donumber = 326 (regexec(&numbering_properties[section].expr, 327 buffer, 0, NULL, 0) == 0); 328 break; 329 } 330 331 if (donumber) { 332 consumed = snprintf(intbuffer, intbuffersize, format, 333 width, line); 334 (void)printf("%s", 335 intbuffer + max(0, consumed - width)); 336 line += incr; 337 } else { 338 (void)printf("%*s", width, ""); 339 } 340 (void)printf("%s%s", sep, buffer); 341 342 if (ferror(stdout)) 343 err(EXIT_FAILURE, "output error"); 344 nextline: 345 ; 346 } 347 348 if (ferror(stdin)) 349 err(EXIT_FAILURE, "input error"); 350 } 351 352 /* 353 * Various support functions. 354 */ 355 356 static void 357 parse_numbering(const char *argstr, int section) 358 { 359 int error; 360 char errorbuf[NL_TEXTMAX]; 361 362 switch (argstr[0]) { 363 case 'a': 364 numbering_properties[section].type = number_all; 365 break; 366 case 'n': 367 numbering_properties[section].type = number_none; 368 break; 369 case 't': 370 numbering_properties[section].type = number_nonempty; 371 break; 372 case 'p': 373 /* If there was a previous expression, throw it away. */ 374 if (numbering_properties[section].type == number_regex) 375 regfree(&numbering_properties[section].expr); 376 else 377 numbering_properties[section].type = number_regex; 378 379 /* Compile/validate the supplied regular expression. */ 380 if ((error = regcomp(&numbering_properties[section].expr, 381 &argstr[1], REG_NEWLINE|REG_NOSUB)) != 0) { 382 (void)regerror(error, 383 &numbering_properties[section].expr, 384 errorbuf, sizeof (errorbuf)); 385 errx(EXIT_FAILURE, 386 "%s expr: %s -- %s", 387 numbering_properties[section].name, errorbuf, 388 &argstr[1]); 389 } 390 break; 391 default: 392 errx(EXIT_FAILURE, 393 "illegal %s line numbering type -- %s", 394 numbering_properties[section].name, argstr); 395 } 396 } 397 398 static void 399 usage(void) 400 { 401 (void)fprintf(stderr, "Usage: %s [-p] [-b type] [-d delim] [-f type] " 402 "[-h type] [-i incr] [-l num]\n\t[-n format] [-s sep] " 403 "[-v startnum] [-w width] [file]\n", getprogname()); 404 exit(EXIT_FAILURE); 405 } 406
Indexes created Tue Oct 14 01:09:49 GMT 2025