1246074Sgabor/*- 2246074Sgabor * Copyright 1986, Larry Wall 3246074Sgabor * 4246074Sgabor * Redistribution and use in source and binary forms, with or without 5246074Sgabor * modification, are permitted provided that the following condition is met: 6246074Sgabor * 1. Redistributions of source code must retain the above copyright notice, 7246074Sgabor * this condition and the following disclaimer. 8246074Sgabor * 9246074Sgabor * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 10246074Sgabor * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 11246074Sgabor * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 12246074Sgabor * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 13246074Sgabor * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 14246074Sgabor * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 15246074Sgabor * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 16246074Sgabor * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 17246074Sgabor * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 18246074Sgabor * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 19246074Sgabor * SUCH DAMAGE. 20246074Sgabor * 21246074Sgabor * patch - a program to apply diffs to original files 22246074Sgabor * 23246074Sgabor * -C option added in 1998, original code by Marc Espie, based on FreeBSD 24246074Sgabor * behaviour 25246074Sgabor * 26246091Sdelphij * $OpenBSD: inp.c,v 1.36 2012/04/10 14:46:34 ajacoutot Exp $ 27246091Sdelphij * $FreeBSD$ 28246074Sgabor */ 29246074Sgabor 30246074Sgabor#include <sys/types.h> 31246074Sgabor#include <sys/file.h> 32246074Sgabor#include <sys/stat.h> 33246074Sgabor#include <sys/mman.h> 34285976Sdelphij#include <sys/wait.h> 35246074Sgabor 36246074Sgabor#include <ctype.h> 37285976Sdelphij#include <errno.h> 38246074Sgabor#include <libgen.h> 39287223Sdelphij#include <paths.h> 40287223Sdelphij#include <spawn.h> 41246074Sgabor#include <stddef.h> 42287223Sdelphij#include <stdint.h> 43246074Sgabor#include <stdio.h> 44246074Sgabor#include <stdlib.h> 45246074Sgabor#include <string.h> 46246074Sgabor#include <unistd.h> 47246074Sgabor 48246074Sgabor#include "common.h" 49246074Sgabor#include "util.h" 50246074Sgabor#include "pch.h" 51246074Sgabor#include "inp.h" 52246074Sgabor 53246074Sgabor 54246074Sgabor/* Input-file-with-indexable-lines abstract type */ 55246074Sgabor 56246074Sgaborstatic size_t i_size; /* size of the input file */ 57246074Sgaborstatic char *i_womp; /* plan a buffer for entire file */ 58246074Sgaborstatic char **i_ptr; /* pointers to lines in i_womp */ 59246074Sgaborstatic char empty_line[] = { '\0' }; 60246074Sgabor 61246074Sgaborstatic int tifd = -1; /* plan b virtual string array */ 62246074Sgaborstatic char *tibuf[2]; /* plan b buffers */ 63246074Sgaborstatic LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ 64246074Sgaborstatic LINENUM lines_per_buf; /* how many lines per buffer */ 65246074Sgaborstatic int tireclen; /* length of records in tmp file */ 66246074Sgabor 67246074Sgaborstatic bool rev_in_string(const char *); 68246074Sgaborstatic bool reallocate_lines(size_t *); 69246074Sgabor 70246074Sgabor/* returns false if insufficient memory */ 71246074Sgaborstatic bool plan_a(const char *); 72246074Sgabor 73246074Sgaborstatic void plan_b(const char *); 74246074Sgabor 75246074Sgabor/* New patch--prepare to edit another file. */ 76246074Sgabor 77246074Sgaborvoid 78246074Sgaborre_input(void) 79246074Sgabor{ 80246074Sgabor if (using_plan_a) { 81246074Sgabor free(i_ptr); 82246074Sgabor i_ptr = NULL; 83246074Sgabor if (i_womp != NULL) { 84246074Sgabor munmap(i_womp, i_size); 85246074Sgabor i_womp = NULL; 86246074Sgabor } 87246074Sgabor i_size = 0; 88246074Sgabor } else { 89246074Sgabor using_plan_a = true; /* maybe the next one is smaller */ 90246074Sgabor close(tifd); 91246074Sgabor tifd = -1; 92246074Sgabor free(tibuf[0]); 93246074Sgabor free(tibuf[1]); 94246074Sgabor tibuf[0] = tibuf[1] = NULL; 95246074Sgabor tiline[0] = tiline[1] = -1; 96246074Sgabor tireclen = 0; 97246074Sgabor } 98246074Sgabor} 99246074Sgabor 100246074Sgabor/* Construct the line index, somehow or other. */ 101246074Sgabor 102246074Sgaborvoid 103246074Sgaborscan_input(const char *filename) 104246074Sgabor{ 105246074Sgabor if (!plan_a(filename)) 106246074Sgabor plan_b(filename); 107246074Sgabor if (verbose) { 108246074Sgabor say("Patching file %s using Plan %s...\n", filename, 109246074Sgabor (using_plan_a ? "A" : "B")); 110246074Sgabor } 111246074Sgabor} 112246074Sgabor 113246074Sgaborstatic bool 114246074Sgaborreallocate_lines(size_t *lines_allocated) 115246074Sgabor{ 116246074Sgabor char **p; 117246074Sgabor size_t new_size; 118246074Sgabor 119246074Sgabor new_size = *lines_allocated * 3 / 2; 120246074Sgabor p = realloc(i_ptr, (new_size + 2) * sizeof(char *)); 121246074Sgabor if (p == NULL) { /* shucks, it was a near thing */ 122246074Sgabor munmap(i_womp, i_size); 123246074Sgabor i_womp = NULL; 124246074Sgabor free(i_ptr); 125246074Sgabor i_ptr = NULL; 126246074Sgabor *lines_allocated = 0; 127246074Sgabor return false; 128246074Sgabor } 129246074Sgabor *lines_allocated = new_size; 130246074Sgabor i_ptr = p; 131246074Sgabor return true; 132246074Sgabor} 133246074Sgabor 134246074Sgabor/* Try keeping everything in memory. */ 135246074Sgabor 136246074Sgaborstatic bool 137246074Sgaborplan_a(const char *filename) 138246074Sgabor{ 139287223Sdelphij int ifd, statfailed, pstat; 140246074Sgabor char *p, *s, lbuf[INITLINELEN]; 141246074Sgabor struct stat filestat; 142246074Sgabor ptrdiff_t sz; 143246074Sgabor size_t i; 144246074Sgabor size_t iline, lines_allocated; 145285976Sdelphij pid_t pid; 146246074Sgabor 147246074Sgabor#ifdef DEBUGGING 148246074Sgabor if (debug & 8) 149246074Sgabor return false; 150246074Sgabor#endif 151246074Sgabor 152246074Sgabor if (filename == NULL || *filename == '\0') 153246074Sgabor return false; 154246074Sgabor 155246074Sgabor statfailed = stat(filename, &filestat); 156246074Sgabor if (statfailed && ok_to_create_file) { 157246074Sgabor if (verbose) 158246074Sgabor say("(Creating file %s...)\n", filename); 159246074Sgabor 160246074Sgabor /* 161246074Sgabor * in check_patch case, we still display `Creating file' even 162246074Sgabor * though we're not. The rule is that -C should be as similar 163246074Sgabor * to normal patch behavior as possible 164246074Sgabor */ 165246074Sgabor if (check_only) 166246074Sgabor return true; 167246074Sgabor makedirs(filename, true); 168246074Sgabor close(creat(filename, 0666)); 169246074Sgabor statfailed = stat(filename, &filestat); 170246074Sgabor } 171246074Sgabor if (statfailed && check_only) 172246074Sgabor fatal("%s not found, -C mode, can't probe further\n", filename); 173285976Sdelphij /* For nonexistent or read-only files, look for RCS versions. */ 174285976Sdelphij 175246074Sgabor if (statfailed || 176246074Sgabor /* No one can write to it. */ 177246074Sgabor (filestat.st_mode & 0222) == 0 || 178246074Sgabor /* I can't write to it. */ 179246074Sgabor ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { 180285976Sdelphij char *filebase, *filedir; 181246074Sgabor struct stat cstat; 182287223Sdelphij char *tmp_filename1, *tmp_filename2; 183287223Sdelphij char *argp[4] = { NULL }; 184287223Sdelphij posix_spawn_file_actions_t file_actions; 185246074Sgabor 186246074Sgabor tmp_filename1 = strdup(filename); 187246074Sgabor tmp_filename2 = strdup(filename); 188246074Sgabor if (tmp_filename1 == NULL || tmp_filename2 == NULL) 189246074Sgabor fatal("strdupping filename"); 190285976Sdelphij 191246074Sgabor filebase = basename(tmp_filename1); 192246074Sgabor filedir = dirname(tmp_filename2); 193246074Sgabor 194287223Sdelphij memset(argp, 0, sizeof(argp)); 195287223Sdelphij 196246074Sgabor#define try(f, a1, a2, a3) \ 197285976Sdelphij (snprintf(lbuf, sizeof(lbuf), f, a1, a2, a3), stat(lbuf, &cstat) == 0) 198246074Sgabor 199246074Sgabor /* 200246074Sgabor * else we can't write to it but it's not under a version 201246074Sgabor * control system, so just proceed. 202246074Sgabor */ 203285976Sdelphij if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 204285976Sdelphij try("%s/RCS/%s%s", filedir, filebase, "") || 205285976Sdelphij try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 206246074Sgabor if (!statfailed) { 207246074Sgabor if ((filestat.st_mode & 0222) != 0) 208246074Sgabor /* The owner can write to it. */ 209246074Sgabor fatal("file %s seems to be locked " 210285976Sdelphij "by somebody else under RCS\n", 211285976Sdelphij filename); 212246074Sgabor /* 213246074Sgabor * It might be checked out unlocked. See if 214246074Sgabor * it's safe to check out the default version 215246074Sgabor * locked. 216246074Sgabor */ 217246074Sgabor if (verbose) 218246074Sgabor say("Comparing file %s to default " 219285976Sdelphij "RCS version...\n", filename); 220285976Sdelphij 221287223Sdelphij argp[0] = __DECONST(char *, RCSDIFF); 222287223Sdelphij argp[1] = __DECONST(char *, filename); 223287223Sdelphij posix_spawn_file_actions_init(&file_actions); 224287223Sdelphij posix_spawn_file_actions_addopen(&file_actions, 225287223Sdelphij STDOUT_FILENO, _PATH_DEVNULL, O_WRONLY, 0); 226287223Sdelphij if (posix_spawn(&pid, RCSDIFF, &file_actions, 227287223Sdelphij NULL, argp, NULL) == 0) { 228287223Sdelphij pid = waitpid(pid, &pstat, 0); 229287223Sdelphij if (pid == -1 || WEXITSTATUS(pstat) != 0) 230287223Sdelphij fatal("can't check out file %s: " 231287223Sdelphij "differs from default RCS version\n", 232287223Sdelphij filename); 233287223Sdelphij } else 234287223Sdelphij fatal("posix_spawn: %s\n", strerror(errno)); 235287223Sdelphij posix_spawn_file_actions_destroy(&file_actions); 236246074Sgabor } 237285976Sdelphij 238246074Sgabor if (verbose) 239285976Sdelphij say("Checking out file %s from RCS...\n", 240285976Sdelphij filename); 241285976Sdelphij 242287223Sdelphij argp[0] = __DECONST(char *, CHECKOUT); 243287223Sdelphij argp[1] = __DECONST(char *, "-l"); 244287223Sdelphij argp[2] = __DECONST(char *, filename); 245287223Sdelphij if (posix_spawn(&pid, CHECKOUT, NULL, NULL, argp, 246287223Sdelphij NULL) == 0) { 247287223Sdelphij pid = waitpid(pid, &pstat, 0); 248287223Sdelphij if (pid == -1 || WEXITSTATUS(pstat) != 0 || 249287223Sdelphij stat(filename, &filestat)) 250287223Sdelphij fatal("can't check out file %s from RCS\n", 251287223Sdelphij filename); 252287223Sdelphij } else 253287223Sdelphij fatal("posix_spawn: %s\n", strerror(errno)); 254285976Sdelphij } else if (statfailed) { 255285976Sdelphij fatal("can't find %s\n", filename); 256246074Sgabor } 257285976Sdelphij free(tmp_filename1); 258285976Sdelphij free(tmp_filename2); 259246074Sgabor } 260285976Sdelphij 261246074Sgabor filemode = filestat.st_mode; 262246074Sgabor if (!S_ISREG(filemode)) 263246074Sgabor fatal("%s is not a normal file--can't patch\n", filename); 264246074Sgabor if ((uint64_t)filestat.st_size > SIZE_MAX) { 265246074Sgabor say("block too large to mmap\n"); 266246074Sgabor return false; 267246074Sgabor } 268246074Sgabor i_size = (size_t)filestat.st_size; 269246074Sgabor if (out_of_mem) { 270246074Sgabor set_hunkmax(); /* make sure dynamic arrays are allocated */ 271246074Sgabor out_of_mem = false; 272246074Sgabor return false; /* force plan b because plan a bombed */ 273246074Sgabor } 274246074Sgabor if ((ifd = open(filename, O_RDONLY)) < 0) 275246074Sgabor pfatal("can't open file %s", filename); 276246074Sgabor 277246074Sgabor if (i_size) { 278246074Sgabor i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 279246074Sgabor if (i_womp == MAP_FAILED) { 280246074Sgabor perror("mmap failed"); 281246074Sgabor i_womp = NULL; 282246074Sgabor close(ifd); 283246074Sgabor return false; 284246074Sgabor } 285246074Sgabor } else { 286246074Sgabor i_womp = NULL; 287246074Sgabor } 288246074Sgabor 289246074Sgabor close(ifd); 290246074Sgabor if (i_size) 291246074Sgabor madvise(i_womp, i_size, MADV_SEQUENTIAL); 292246074Sgabor 293246074Sgabor /* estimate the number of lines */ 294246074Sgabor lines_allocated = i_size / 25; 295246074Sgabor if (lines_allocated < 100) 296246074Sgabor lines_allocated = 100; 297246074Sgabor 298246074Sgabor if (!reallocate_lines(&lines_allocated)) 299246074Sgabor return false; 300246074Sgabor 301246074Sgabor /* now scan the buffer and build pointer array */ 302246074Sgabor iline = 1; 303246074Sgabor i_ptr[iline] = i_womp; 304246074Sgabor /* test for NUL too, to maintain the behavior of the original code */ 305246074Sgabor for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 306246074Sgabor if (*s == '\n') { 307246074Sgabor if (iline == lines_allocated) { 308246074Sgabor if (!reallocate_lines(&lines_allocated)) 309246074Sgabor return false; 310246074Sgabor } 311246074Sgabor /* these are NOT NUL terminated */ 312246074Sgabor i_ptr[++iline] = s + 1; 313246074Sgabor } 314246074Sgabor } 315246074Sgabor /* if the last line contains no EOL, append one */ 316246074Sgabor if (i_size > 0 && i_womp[i_size - 1] != '\n') { 317246074Sgabor last_line_missing_eol = true; 318246074Sgabor /* fix last line */ 319246074Sgabor sz = s - i_ptr[iline]; 320246074Sgabor p = malloc(sz + 1); 321246074Sgabor if (p == NULL) { 322246074Sgabor free(i_ptr); 323246074Sgabor i_ptr = NULL; 324246074Sgabor munmap(i_womp, i_size); 325246074Sgabor i_womp = NULL; 326246074Sgabor return false; 327246074Sgabor } 328246074Sgabor 329246074Sgabor memcpy(p, i_ptr[iline], sz); 330246074Sgabor p[sz] = '\n'; 331246074Sgabor i_ptr[iline] = p; 332246074Sgabor /* count the extra line and make it point to some valid mem */ 333246074Sgabor i_ptr[++iline] = empty_line; 334246074Sgabor } else 335246074Sgabor last_line_missing_eol = false; 336246074Sgabor 337246074Sgabor input_lines = iline - 1; 338246074Sgabor 339246074Sgabor /* now check for revision, if any */ 340246074Sgabor 341246074Sgabor if (revision != NULL) { 342246074Sgabor if (!rev_in_string(i_womp)) { 343246074Sgabor if (force) { 344246074Sgabor if (verbose) 345246074Sgabor say("Warning: this file doesn't appear " 346246074Sgabor "to be the %s version--patching anyway.\n", 347246074Sgabor revision); 348246074Sgabor } else if (batch) { 349246074Sgabor fatal("this file doesn't appear to be the " 350246074Sgabor "%s version--aborting.\n", 351246074Sgabor revision); 352246074Sgabor } else { 353246074Sgabor ask("This file doesn't appear to be the " 354246074Sgabor "%s version--patch anyway? [n] ", 355246074Sgabor revision); 356246074Sgabor if (*buf != 'y') 357246074Sgabor fatal("aborted\n"); 358246074Sgabor } 359246074Sgabor } else if (verbose) 360246074Sgabor say("Good. This file appears to be the %s version.\n", 361246074Sgabor revision); 362246074Sgabor } 363246074Sgabor return true; /* plan a will work */ 364246074Sgabor} 365246074Sgabor 366246074Sgabor/* Keep (virtually) nothing in memory. */ 367246074Sgabor 368246074Sgaborstatic void 369246074Sgaborplan_b(const char *filename) 370246074Sgabor{ 371246074Sgabor FILE *ifp; 372246074Sgabor size_t i = 0, j, maxlen = 1; 373246074Sgabor char *p; 374246074Sgabor bool found_revision = (revision == NULL); 375246074Sgabor 376246074Sgabor using_plan_a = false; 377246074Sgabor if ((ifp = fopen(filename, "r")) == NULL) 378246074Sgabor pfatal("can't open file %s", filename); 379246074Sgabor unlink(TMPINNAME); 380246074Sgabor if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 381246074Sgabor pfatal("can't open file %s", TMPINNAME); 382246074Sgabor while (fgets(buf, buf_size, ifp) != NULL) { 383246074Sgabor if (revision != NULL && !found_revision && rev_in_string(buf)) 384246074Sgabor found_revision = true; 385246074Sgabor if ((i = strlen(buf)) > maxlen) 386246074Sgabor maxlen = i; /* find longest line */ 387246074Sgabor } 388246074Sgabor last_line_missing_eol = i > 0 && buf[i - 1] != '\n'; 389246074Sgabor if (last_line_missing_eol && maxlen == i) 390246074Sgabor maxlen++; 391246074Sgabor 392246074Sgabor if (revision != NULL) { 393246074Sgabor if (!found_revision) { 394246074Sgabor if (force) { 395246074Sgabor if (verbose) 396246074Sgabor say("Warning: this file doesn't appear " 397246074Sgabor "to be the %s version--patching anyway.\n", 398246074Sgabor revision); 399246074Sgabor } else if (batch) { 400246074Sgabor fatal("this file doesn't appear to be the " 401246074Sgabor "%s version--aborting.\n", 402246074Sgabor revision); 403246074Sgabor } else { 404246074Sgabor ask("This file doesn't appear to be the %s " 405246074Sgabor "version--patch anyway? [n] ", 406246074Sgabor revision); 407246074Sgabor if (*buf != 'y') 408246074Sgabor fatal("aborted\n"); 409246074Sgabor } 410246074Sgabor } else if (verbose) 411246074Sgabor say("Good. This file appears to be the %s version.\n", 412246074Sgabor revision); 413246074Sgabor } 414246074Sgabor fseek(ifp, 0L, SEEK_SET); /* rewind file */ 415246074Sgabor lines_per_buf = BUFFERSIZE / maxlen; 416246074Sgabor tireclen = maxlen; 417246074Sgabor tibuf[0] = malloc(BUFFERSIZE + 1); 418246074Sgabor if (tibuf[0] == NULL) 419246074Sgabor fatal("out of memory\n"); 420246074Sgabor tibuf[1] = malloc(BUFFERSIZE + 1); 421246074Sgabor if (tibuf[1] == NULL) 422246074Sgabor fatal("out of memory\n"); 423246074Sgabor for (i = 1;; i++) { 424246074Sgabor p = tibuf[0] + maxlen * (i % lines_per_buf); 425246074Sgabor if (i % lines_per_buf == 0) /* new block */ 426246074Sgabor if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 427246074Sgabor pfatal("can't write temp file"); 428246074Sgabor if (fgets(p, maxlen + 1, ifp) == NULL) { 429246074Sgabor input_lines = i - 1; 430246074Sgabor if (i % lines_per_buf != 0) 431246074Sgabor if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 432246074Sgabor pfatal("can't write temp file"); 433246074Sgabor break; 434246074Sgabor } 435246074Sgabor j = strlen(p); 436246074Sgabor /* These are '\n' terminated strings, so no need to add a NUL */ 437246074Sgabor if (j == 0 || p[j - 1] != '\n') 438246074Sgabor p[j] = '\n'; 439246074Sgabor } 440246074Sgabor fclose(ifp); 441246074Sgabor close(tifd); 442246074Sgabor if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 443246074Sgabor pfatal("can't reopen file %s", TMPINNAME); 444246074Sgabor} 445246074Sgabor 446246074Sgabor/* 447246074Sgabor * Fetch a line from the input file, \n terminated, not necessarily \0. 448246074Sgabor */ 449246074Sgaborchar * 450246074Sgaborifetch(LINENUM line, int whichbuf) 451246074Sgabor{ 452246074Sgabor if (line < 1 || line > input_lines) { 453246074Sgabor if (warn_on_invalid_line) { 454246074Sgabor say("No such line %ld in input file, ignoring\n", line); 455246074Sgabor warn_on_invalid_line = false; 456246074Sgabor } 457246074Sgabor return NULL; 458246074Sgabor } 459246074Sgabor if (using_plan_a) 460246074Sgabor return i_ptr[line]; 461246074Sgabor else { 462246074Sgabor LINENUM offline = line % lines_per_buf; 463246074Sgabor LINENUM baseline = line - offline; 464246074Sgabor 465246074Sgabor if (tiline[0] == baseline) 466246074Sgabor whichbuf = 0; 467246074Sgabor else if (tiline[1] == baseline) 468246074Sgabor whichbuf = 1; 469246074Sgabor else { 470246074Sgabor tiline[whichbuf] = baseline; 471246074Sgabor 472246074Sgabor if (lseek(tifd, (off_t) (baseline / lines_per_buf * 473246074Sgabor BUFFERSIZE), SEEK_SET) < 0) 474246074Sgabor pfatal("cannot seek in the temporary input file"); 475246074Sgabor 476246074Sgabor if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) 477246074Sgabor pfatal("error reading tmp file %s", TMPINNAME); 478246074Sgabor } 479246074Sgabor return tibuf[whichbuf] + (tireclen * offline); 480246074Sgabor } 481246074Sgabor} 482246074Sgabor 483246074Sgabor/* 484246074Sgabor * True if the string argument contains the revision number we want. 485246074Sgabor */ 486246074Sgaborstatic bool 487246074Sgaborrev_in_string(const char *string) 488246074Sgabor{ 489246074Sgabor const char *s; 490246074Sgabor size_t patlen; 491246074Sgabor 492246074Sgabor if (revision == NULL) 493246074Sgabor return true; 494246074Sgabor patlen = strlen(revision); 495246074Sgabor if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen])) 496246074Sgabor return true; 497246074Sgabor for (s = string; *s; s++) { 498246074Sgabor if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) && 499246074Sgabor isspace((unsigned char)s[patlen + 1])) { 500246074Sgabor return true; 501246074Sgabor } 502246074Sgabor } 503246074Sgabor return false; 504246074Sgabor} 505