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> 34285979Sdelphij#include <sys/wait.h> 35246074Sgabor 36246074Sgabor#include <ctype.h> 37285979Sdelphij#include <errno.h> 38246074Sgabor#include <libgen.h> 39246074Sgabor#include <limits.h> 40246074Sgabor#include <stddef.h> 41246074Sgabor#include <stdio.h> 42246074Sgabor#include <stdlib.h> 43246074Sgabor#include <string.h> 44246074Sgabor#include <unistd.h> 45246074Sgabor 46246074Sgabor#include "common.h" 47246074Sgabor#include "util.h" 48246074Sgabor#include "pch.h" 49246074Sgabor#include "inp.h" 50246074Sgabor 51246074Sgabor 52246074Sgabor/* Input-file-with-indexable-lines abstract type */ 53246074Sgabor 54246074Sgaborstatic size_t i_size; /* size of the input file */ 55246074Sgaborstatic char *i_womp; /* plan a buffer for entire file */ 56246074Sgaborstatic char **i_ptr; /* pointers to lines in i_womp */ 57246074Sgaborstatic char empty_line[] = { '\0' }; 58246074Sgabor 59246074Sgaborstatic int tifd = -1; /* plan b virtual string array */ 60246074Sgaborstatic char *tibuf[2]; /* plan b buffers */ 61246074Sgaborstatic LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ 62246074Sgaborstatic LINENUM lines_per_buf; /* how many lines per buffer */ 63246074Sgaborstatic int tireclen; /* length of records in tmp file */ 64246074Sgabor 65246074Sgaborstatic bool rev_in_string(const char *); 66246074Sgaborstatic bool reallocate_lines(size_t *); 67246074Sgabor 68246074Sgabor/* returns false if insufficient memory */ 69246074Sgaborstatic bool plan_a(const char *); 70246074Sgabor 71246074Sgaborstatic void plan_b(const char *); 72246074Sgabor 73246074Sgabor/* New patch--prepare to edit another file. */ 74246074Sgabor 75246074Sgaborvoid 76246074Sgaborre_input(void) 77246074Sgabor{ 78246074Sgabor if (using_plan_a) { 79246074Sgabor free(i_ptr); 80246074Sgabor i_ptr = NULL; 81246074Sgabor if (i_womp != NULL) { 82246074Sgabor munmap(i_womp, i_size); 83246074Sgabor i_womp = NULL; 84246074Sgabor } 85246074Sgabor i_size = 0; 86246074Sgabor } else { 87246074Sgabor using_plan_a = true; /* maybe the next one is smaller */ 88246074Sgabor close(tifd); 89246074Sgabor tifd = -1; 90246074Sgabor free(tibuf[0]); 91246074Sgabor free(tibuf[1]); 92246074Sgabor tibuf[0] = tibuf[1] = NULL; 93246074Sgabor tiline[0] = tiline[1] = -1; 94246074Sgabor tireclen = 0; 95246074Sgabor } 96246074Sgabor} 97246074Sgabor 98246074Sgabor/* Construct the line index, somehow or other. */ 99246074Sgabor 100246074Sgaborvoid 101246074Sgaborscan_input(const char *filename) 102246074Sgabor{ 103246074Sgabor if (!plan_a(filename)) 104246074Sgabor plan_b(filename); 105246074Sgabor if (verbose) { 106246074Sgabor say("Patching file %s using Plan %s...\n", filename, 107246074Sgabor (using_plan_a ? "A" : "B")); 108246074Sgabor } 109246074Sgabor} 110246074Sgabor 111246074Sgaborstatic bool 112246074Sgaborreallocate_lines(size_t *lines_allocated) 113246074Sgabor{ 114246074Sgabor char **p; 115246074Sgabor size_t new_size; 116246074Sgabor 117246074Sgabor new_size = *lines_allocated * 3 / 2; 118246074Sgabor p = realloc(i_ptr, (new_size + 2) * sizeof(char *)); 119246074Sgabor if (p == NULL) { /* shucks, it was a near thing */ 120246074Sgabor munmap(i_womp, i_size); 121246074Sgabor i_womp = NULL; 122246074Sgabor free(i_ptr); 123246074Sgabor i_ptr = NULL; 124246074Sgabor *lines_allocated = 0; 125246074Sgabor return false; 126246074Sgabor } 127246074Sgabor *lines_allocated = new_size; 128246074Sgabor i_ptr = p; 129246074Sgabor return true; 130246074Sgabor} 131246074Sgabor 132246074Sgabor/* Try keeping everything in memory. */ 133246074Sgabor 134246074Sgaborstatic bool 135246074Sgaborplan_a(const char *filename) 136246074Sgabor{ 137285979Sdelphij int ifd, statfailed, devnull, pstat; 138246074Sgabor char *p, *s, lbuf[INITLINELEN]; 139246074Sgabor struct stat filestat; 140246074Sgabor ptrdiff_t sz; 141246074Sgabor size_t i; 142246074Sgabor size_t iline, lines_allocated; 143285979Sdelphij pid_t pid; 144285979Sdelphij char *argp[4] = {NULL}; 145246074Sgabor 146246074Sgabor#ifdef DEBUGGING 147246074Sgabor if (debug & 8) 148246074Sgabor return false; 149246074Sgabor#endif 150246074Sgabor 151246074Sgabor if (filename == NULL || *filename == '\0') 152246074Sgabor return false; 153246074Sgabor 154246074Sgabor statfailed = stat(filename, &filestat); 155246074Sgabor if (statfailed && ok_to_create_file) { 156246074Sgabor if (verbose) 157246074Sgabor say("(Creating file %s...)\n", filename); 158246074Sgabor 159246074Sgabor /* 160246074Sgabor * in check_patch case, we still display `Creating file' even 161246074Sgabor * though we're not. The rule is that -C should be as similar 162246074Sgabor * to normal patch behavior as possible 163246074Sgabor */ 164246074Sgabor if (check_only) 165246074Sgabor return true; 166246074Sgabor makedirs(filename, true); 167246074Sgabor close(creat(filename, 0666)); 168246074Sgabor statfailed = stat(filename, &filestat); 169246074Sgabor } 170246074Sgabor if (statfailed && check_only) 171246074Sgabor fatal("%s not found, -C mode, can't probe further\n", filename); 172285979Sdelphij /* For nonexistent or read-only files, look for RCS versions. */ 173285979Sdelphij 174246074Sgabor if (statfailed || 175246074Sgabor /* No one can write to it. */ 176246074Sgabor (filestat.st_mode & 0222) == 0 || 177246074Sgabor /* I can't write to it. */ 178246074Sgabor ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { 179285979Sdelphij char *filebase, *filedir; 180246074Sgabor struct stat cstat; 181246074Sgabor char *tmp_filename1, *tmp_filename2; 182246074Sgabor 183246074Sgabor tmp_filename1 = strdup(filename); 184246074Sgabor tmp_filename2 = strdup(filename); 185246074Sgabor if (tmp_filename1 == NULL || tmp_filename2 == NULL) 186246074Sgabor fatal("strdupping filename"); 187285979Sdelphij 188246074Sgabor filebase = basename(tmp_filename1); 189246074Sgabor filedir = dirname(tmp_filename2); 190246074Sgabor 191246074Sgabor#define try(f, a1, a2, a3) \ 192285979Sdelphij (snprintf(lbuf, sizeof(lbuf), f, a1, a2, a3), stat(lbuf, &cstat) == 0) 193246074Sgabor 194246074Sgabor /* 195246074Sgabor * else we can't write to it but it's not under a version 196246074Sgabor * control system, so just proceed. 197246074Sgabor */ 198285979Sdelphij if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 199285979Sdelphij try("%s/RCS/%s%s", filedir, filebase, "") || 200285979Sdelphij try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 201246074Sgabor if (!statfailed) { 202246074Sgabor if ((filestat.st_mode & 0222) != 0) 203246074Sgabor /* The owner can write to it. */ 204246074Sgabor fatal("file %s seems to be locked " 205285979Sdelphij "by somebody else under RCS\n", 206285979Sdelphij filename); 207246074Sgabor /* 208246074Sgabor * It might be checked out unlocked. See if 209246074Sgabor * it's safe to check out the default version 210246074Sgabor * locked. 211246074Sgabor */ 212246074Sgabor if (verbose) 213246074Sgabor say("Comparing file %s to default " 214285979Sdelphij "RCS version...\n", filename); 215285979Sdelphij 216285979Sdelphij switch (pid = fork()) { 217285979Sdelphij case -1: 218285979Sdelphij fatal("can't fork: %s\n", 219285979Sdelphij strerror(errno)); 220285979Sdelphij case 0: 221285979Sdelphij devnull = open("/dev/null", O_RDONLY); 222285979Sdelphij if (devnull == -1) { 223285979Sdelphij fatal("can't open /dev/null: %s", 224285979Sdelphij strerror(errno)); 225285979Sdelphij } 226285979Sdelphij (void)dup2(devnull, STDOUT_FILENO); 227285979Sdelphij argp[0] = strdup(RCSDIFF); 228285979Sdelphij argp[1] = strdup(filename); 229285979Sdelphij execv(RCSDIFF, argp); 230285979Sdelphij exit(127); 231285979Sdelphij } 232285979Sdelphij pid = waitpid(pid, &pstat, 0); 233285979Sdelphij if (pid == -1 || WEXITSTATUS(pstat) != 0) { 234246074Sgabor fatal("can't check out file %s: " 235285979Sdelphij "differs from default RCS version\n", 236285979Sdelphij filename); 237285979Sdelphij } 238246074Sgabor } 239285979Sdelphij 240246074Sgabor if (verbose) 241285979Sdelphij say("Checking out file %s from RCS...\n", 242285979Sdelphij filename); 243285979Sdelphij 244285979Sdelphij switch (pid = fork()) { 245285979Sdelphij case -1: 246285979Sdelphij fatal("can't fork: %s\n", strerror(errno)); 247285979Sdelphij case 0: 248285979Sdelphij argp[0] = strdup(CHECKOUT); 249285979Sdelphij argp[1] = strdup("-l"); 250285979Sdelphij argp[2] = strdup(filename); 251285979Sdelphij execv(CHECKOUT, argp); 252285979Sdelphij exit(127); 253285979Sdelphij } 254285979Sdelphij pid = waitpid(pid, &pstat, 0); 255285979Sdelphij if (pid == -1 || WEXITSTATUS(pstat) != 0 || 256285979Sdelphij stat(filename, &filestat)) { 257285979Sdelphij fatal("can't check out file %s from RCS\n", 258285979Sdelphij filename); 259285979Sdelphij } 260285979Sdelphij } else if (statfailed) { 261285979Sdelphij fatal("can't find %s\n", filename); 262246074Sgabor } 263285979Sdelphij free(tmp_filename1); 264285979Sdelphij free(tmp_filename2); 265246074Sgabor } 266285979Sdelphij 267246074Sgabor filemode = filestat.st_mode; 268246074Sgabor if (!S_ISREG(filemode)) 269246074Sgabor fatal("%s is not a normal file--can't patch\n", filename); 270246074Sgabor if ((uint64_t)filestat.st_size > SIZE_MAX) { 271246074Sgabor say("block too large to mmap\n"); 272246074Sgabor return false; 273246074Sgabor } 274246074Sgabor i_size = (size_t)filestat.st_size; 275246074Sgabor if (out_of_mem) { 276246074Sgabor set_hunkmax(); /* make sure dynamic arrays are allocated */ 277246074Sgabor out_of_mem = false; 278246074Sgabor return false; /* force plan b because plan a bombed */ 279246074Sgabor } 280246074Sgabor if ((ifd = open(filename, O_RDONLY)) < 0) 281246074Sgabor pfatal("can't open file %s", filename); 282246074Sgabor 283246074Sgabor if (i_size) { 284246074Sgabor i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 285246074Sgabor if (i_womp == MAP_FAILED) { 286246074Sgabor perror("mmap failed"); 287246074Sgabor i_womp = NULL; 288246074Sgabor close(ifd); 289246074Sgabor return false; 290246074Sgabor } 291246074Sgabor } else { 292246074Sgabor i_womp = NULL; 293246074Sgabor } 294246074Sgabor 295246074Sgabor close(ifd); 296246074Sgabor if (i_size) 297246074Sgabor madvise(i_womp, i_size, MADV_SEQUENTIAL); 298246074Sgabor 299246074Sgabor /* estimate the number of lines */ 300246074Sgabor lines_allocated = i_size / 25; 301246074Sgabor if (lines_allocated < 100) 302246074Sgabor lines_allocated = 100; 303246074Sgabor 304246074Sgabor if (!reallocate_lines(&lines_allocated)) 305246074Sgabor return false; 306246074Sgabor 307246074Sgabor /* now scan the buffer and build pointer array */ 308246074Sgabor iline = 1; 309246074Sgabor i_ptr[iline] = i_womp; 310246074Sgabor /* test for NUL too, to maintain the behavior of the original code */ 311246074Sgabor for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 312246074Sgabor if (*s == '\n') { 313246074Sgabor if (iline == lines_allocated) { 314246074Sgabor if (!reallocate_lines(&lines_allocated)) 315246074Sgabor return false; 316246074Sgabor } 317246074Sgabor /* these are NOT NUL terminated */ 318246074Sgabor i_ptr[++iline] = s + 1; 319246074Sgabor } 320246074Sgabor } 321246074Sgabor /* if the last line contains no EOL, append one */ 322246074Sgabor if (i_size > 0 && i_womp[i_size - 1] != '\n') { 323246074Sgabor last_line_missing_eol = true; 324246074Sgabor /* fix last line */ 325246074Sgabor sz = s - i_ptr[iline]; 326246074Sgabor p = malloc(sz + 1); 327246074Sgabor if (p == NULL) { 328246074Sgabor free(i_ptr); 329246074Sgabor i_ptr = NULL; 330246074Sgabor munmap(i_womp, i_size); 331246074Sgabor i_womp = NULL; 332246074Sgabor return false; 333246074Sgabor } 334246074Sgabor 335246074Sgabor memcpy(p, i_ptr[iline], sz); 336246074Sgabor p[sz] = '\n'; 337246074Sgabor i_ptr[iline] = p; 338246074Sgabor /* count the extra line and make it point to some valid mem */ 339246074Sgabor i_ptr[++iline] = empty_line; 340246074Sgabor } else 341246074Sgabor last_line_missing_eol = false; 342246074Sgabor 343246074Sgabor input_lines = iline - 1; 344246074Sgabor 345246074Sgabor /* now check for revision, if any */ 346246074Sgabor 347246074Sgabor if (revision != NULL) { 348246074Sgabor if (!rev_in_string(i_womp)) { 349246074Sgabor if (force) { 350246074Sgabor if (verbose) 351246074Sgabor say("Warning: this file doesn't appear " 352246074Sgabor "to be the %s version--patching anyway.\n", 353246074Sgabor revision); 354246074Sgabor } else if (batch) { 355246074Sgabor fatal("this file doesn't appear to be the " 356246074Sgabor "%s version--aborting.\n", 357246074Sgabor revision); 358246074Sgabor } else { 359246074Sgabor ask("This file doesn't appear to be the " 360246074Sgabor "%s version--patch anyway? [n] ", 361246074Sgabor revision); 362246074Sgabor if (*buf != 'y') 363246074Sgabor fatal("aborted\n"); 364246074Sgabor } 365246074Sgabor } else if (verbose) 366246074Sgabor say("Good. This file appears to be the %s version.\n", 367246074Sgabor revision); 368246074Sgabor } 369246074Sgabor return true; /* plan a will work */ 370246074Sgabor} 371246074Sgabor 372246074Sgabor/* Keep (virtually) nothing in memory. */ 373246074Sgabor 374246074Sgaborstatic void 375246074Sgaborplan_b(const char *filename) 376246074Sgabor{ 377246074Sgabor FILE *ifp; 378246074Sgabor size_t i = 0, j, maxlen = 1; 379246074Sgabor char *p; 380246074Sgabor bool found_revision = (revision == NULL); 381246074Sgabor 382246074Sgabor using_plan_a = false; 383246074Sgabor if ((ifp = fopen(filename, "r")) == NULL) 384246074Sgabor pfatal("can't open file %s", filename); 385246074Sgabor unlink(TMPINNAME); 386246074Sgabor if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 387246074Sgabor pfatal("can't open file %s", TMPINNAME); 388246074Sgabor while (fgets(buf, buf_size, ifp) != NULL) { 389246074Sgabor if (revision != NULL && !found_revision && rev_in_string(buf)) 390246074Sgabor found_revision = true; 391246074Sgabor if ((i = strlen(buf)) > maxlen) 392246074Sgabor maxlen = i; /* find longest line */ 393246074Sgabor } 394246074Sgabor last_line_missing_eol = i > 0 && buf[i - 1] != '\n'; 395246074Sgabor if (last_line_missing_eol && maxlen == i) 396246074Sgabor maxlen++; 397246074Sgabor 398246074Sgabor if (revision != NULL) { 399246074Sgabor if (!found_revision) { 400246074Sgabor if (force) { 401246074Sgabor if (verbose) 402246074Sgabor say("Warning: this file doesn't appear " 403246074Sgabor "to be the %s version--patching anyway.\n", 404246074Sgabor revision); 405246074Sgabor } else if (batch) { 406246074Sgabor fatal("this file doesn't appear to be the " 407246074Sgabor "%s version--aborting.\n", 408246074Sgabor revision); 409246074Sgabor } else { 410246074Sgabor ask("This file doesn't appear to be the %s " 411246074Sgabor "version--patch anyway? [n] ", 412246074Sgabor revision); 413246074Sgabor if (*buf != 'y') 414246074Sgabor fatal("aborted\n"); 415246074Sgabor } 416246074Sgabor } else if (verbose) 417246074Sgabor say("Good. This file appears to be the %s version.\n", 418246074Sgabor revision); 419246074Sgabor } 420246074Sgabor fseek(ifp, 0L, SEEK_SET); /* rewind file */ 421246074Sgabor lines_per_buf = BUFFERSIZE / maxlen; 422246074Sgabor tireclen = maxlen; 423246074Sgabor tibuf[0] = malloc(BUFFERSIZE + 1); 424246074Sgabor if (tibuf[0] == NULL) 425246074Sgabor fatal("out of memory\n"); 426246074Sgabor tibuf[1] = malloc(BUFFERSIZE + 1); 427246074Sgabor if (tibuf[1] == NULL) 428246074Sgabor fatal("out of memory\n"); 429246074Sgabor for (i = 1;; i++) { 430246074Sgabor p = tibuf[0] + maxlen * (i % lines_per_buf); 431246074Sgabor if (i % lines_per_buf == 0) /* new block */ 432246074Sgabor if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 433246074Sgabor pfatal("can't write temp file"); 434246074Sgabor if (fgets(p, maxlen + 1, ifp) == NULL) { 435246074Sgabor input_lines = i - 1; 436246074Sgabor if (i % lines_per_buf != 0) 437246074Sgabor if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 438246074Sgabor pfatal("can't write temp file"); 439246074Sgabor break; 440246074Sgabor } 441246074Sgabor j = strlen(p); 442246074Sgabor /* These are '\n' terminated strings, so no need to add a NUL */ 443246074Sgabor if (j == 0 || p[j - 1] != '\n') 444246074Sgabor p[j] = '\n'; 445246074Sgabor } 446246074Sgabor fclose(ifp); 447246074Sgabor close(tifd); 448246074Sgabor if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 449246074Sgabor pfatal("can't reopen file %s", TMPINNAME); 450246074Sgabor} 451246074Sgabor 452246074Sgabor/* 453246074Sgabor * Fetch a line from the input file, \n terminated, not necessarily \0. 454246074Sgabor */ 455246074Sgaborchar * 456246074Sgaborifetch(LINENUM line, int whichbuf) 457246074Sgabor{ 458246074Sgabor if (line < 1 || line > input_lines) { 459246074Sgabor if (warn_on_invalid_line) { 460246074Sgabor say("No such line %ld in input file, ignoring\n", line); 461246074Sgabor warn_on_invalid_line = false; 462246074Sgabor } 463246074Sgabor return NULL; 464246074Sgabor } 465246074Sgabor if (using_plan_a) 466246074Sgabor return i_ptr[line]; 467246074Sgabor else { 468246074Sgabor LINENUM offline = line % lines_per_buf; 469246074Sgabor LINENUM baseline = line - offline; 470246074Sgabor 471246074Sgabor if (tiline[0] == baseline) 472246074Sgabor whichbuf = 0; 473246074Sgabor else if (tiline[1] == baseline) 474246074Sgabor whichbuf = 1; 475246074Sgabor else { 476246074Sgabor tiline[whichbuf] = baseline; 477246074Sgabor 478246074Sgabor if (lseek(tifd, (off_t) (baseline / lines_per_buf * 479246074Sgabor BUFFERSIZE), SEEK_SET) < 0) 480246074Sgabor pfatal("cannot seek in the temporary input file"); 481246074Sgabor 482246074Sgabor if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) 483246074Sgabor pfatal("error reading tmp file %s", TMPINNAME); 484246074Sgabor } 485246074Sgabor return tibuf[whichbuf] + (tireclen * offline); 486246074Sgabor } 487246074Sgabor} 488246074Sgabor 489246074Sgabor/* 490246074Sgabor * True if the string argument contains the revision number we want. 491246074Sgabor */ 492246074Sgaborstatic bool 493246074Sgaborrev_in_string(const char *string) 494246074Sgabor{ 495246074Sgabor const char *s; 496246074Sgabor size_t patlen; 497246074Sgabor 498246074Sgabor if (revision == NULL) 499246074Sgabor return true; 500246074Sgabor patlen = strlen(revision); 501246074Sgabor if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen])) 502246074Sgabor return true; 503246074Sgabor for (s = string; *s; s++) { 504246074Sgabor if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) && 505246074Sgabor isspace((unsigned char)s[patlen + 1])) { 506246074Sgabor return true; 507246074Sgabor } 508246074Sgabor } 509246074Sgabor return false; 510246074Sgabor} 511