1 /* $OpenBSD: inp.c,v 1.20 2003/07/28 19:15:34 deraadt Exp $ */ 2 3 #ifndef lint 4 static const char rcsid[] = "$OpenBSD: inp.c,v 1.20 2003/07/28 19:15:34 deraadt Exp $"; 5 #endif /* not lint */ 6 7 #include <sys/types.h> 8 #include <sys/file.h> 9 #include <sys/stat.h> 10 11 #include <ctype.h> 12 #include <libgen.h> 13 #include <limits.h> 14 #include <stdio.h> 15 #include <stdlib.h> 16 #include <string.h> 17 #include <unistd.h> 18 19 #include "common.h" 20 #include "util.h" 21 #include "pch.h" 22 #include "inp.h" 23 24 25 /* Input-file-with-indexable-lines abstract type */ 26 27 static off_t i_size; /* size of the input file */ 28 static char *i_womp; /* plan a buffer for entire file */ 29 static char **i_ptr; /* pointers to lines in i_womp */ 30 31 static int tifd = -1; /* plan b virtual string array */ 32 static char *tibuf[2]; /* plan b buffers */ 33 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ 34 static LINENUM lines_per_buf; /* how many lines per buffer */ 35 static int tireclen; /* length of records in tmp file */ 36 37 static bool rev_in_string(const char *); 38 39 /* returns false if insufficient memory */ 40 static bool plan_a(const char *); 41 42 static void plan_b(const char *); 43 44 /* New patch--prepare to edit another file. */ 45 46 void 47 re_input(void) 48 { 49 if (using_plan_a) { 50 i_size = 0; 51 free(i_ptr); 52 free(i_womp); 53 i_womp = NULL; 54 i_ptr = NULL; 55 } else { 56 using_plan_a = TRUE; /* maybe the next one is smaller */ 57 close(tifd); 58 tifd = -1; 59 free(tibuf[0]); 60 free(tibuf[1]); 61 tibuf[0] = tibuf[1] = NULL; 62 tiline[0] = tiline[1] = -1; 63 tireclen = 0; 64 } 65 } 66 67 /* Constuct the line index, somehow or other. */ 68 69 void 70 scan_input(const char *filename) 71 { 72 if (!plan_a(filename)) 73 plan_b(filename); 74 if (verbose) { 75 say("Patching file %s using Plan %s...\n", filename, 76 (using_plan_a ? "A" : "B")); 77 } 78 } 79 80 /* Try keeping everything in memory. */ 81 82 static bool 83 plan_a(const char *filename) 84 { 85 int ifd, statfailed; 86 char *s, lbuf[MAXLINELEN]; 87 LINENUM iline; 88 struct stat filestat; 89 90 if (filename == NULL || *filename == '\0') 91 return FALSE; 92 93 statfailed = stat(filename, &filestat); 94 if (statfailed && ok_to_create_file) { 95 if (verbose) 96 say("(Creating file %s...)\n", filename); 97 98 /* 99 * in check_patch case, we still display `Creating file' even 100 * though we're not. The rule is that -C should be as similar 101 * to normal patch behavior as possible 102 */ 103 if (check_only) 104 return TRUE; 105 makedirs(filename, TRUE); 106 close(creat(filename, 0666)); 107 statfailed = stat(filename, &filestat); 108 } 109 if (statfailed && check_only) 110 fatal("%s not found, -C mode, can't probe further\n", filename); 111 /* For nonexistent or read-only files, look for RCS or SCCS versions. */ 112 if (statfailed || 113 /* No one can write to it. */ 114 (filestat.st_mode & 0222) == 0 || 115 /* I can't write to it. */ 116 ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { 117 char *cs = NULL, *filebase, *filedir; 118 struct stat cstat; 119 120 filebase = basename(filename); 121 filedir = dirname(filename); 122 123 /* Leave room in lbuf for the diff command. */ 124 s = lbuf + 20; 125 126 #define try(f, a1, a2, a3) \ 127 (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0) 128 129 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 130 try("%s/RCS/%s%s", filedir, filebase, "") || 131 try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { 132 snprintf(buf, sizeof buf, CHECKOUT, filename); 133 snprintf(lbuf, sizeof lbuf, RCSDIFF, filename); 134 cs = "RCS"; 135 } else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) || 136 try("%s/%s%s", filedir, SCCSPREFIX, filebase)) { 137 snprintf(buf, sizeof buf, GET, s); 138 snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename); 139 cs = "SCCS"; 140 } else if (statfailed) 141 fatal("can't find %s\n", filename); 142 /* 143 * else we can't write to it but it's not under a version 144 * control system, so just proceed. 145 */ 146 if (cs) { 147 if (!statfailed) { 148 if ((filestat.st_mode & 0222) != 0) 149 /* The owner can write to it. */ 150 fatal("file %s seems to be locked " 151 "by somebody else under %s\n", 152 filename, cs); 153 /* 154 * It might be checked out unlocked. See if 155 * it's safe to check out the default version 156 * locked. 157 */ 158 if (verbose) 159 say("Comparing file %s to default " 160 "%s version...\n", 161 filename, cs); 162 if (system(lbuf)) 163 fatal("can't check out file %s: " 164 "differs from default %s version\n", 165 filename, cs); 166 } 167 if (verbose) 168 say("Checking out file %s from %s...\n", 169 filename, cs); 170 if (system(buf) || stat(filename, &filestat)) 171 fatal("can't check out file %s from %s\n", 172 filename, cs); 173 } 174 } 175 filemode = filestat.st_mode; 176 if (!S_ISREG(filemode)) 177 fatal("%s is not a normal file--can't patch\n", filename); 178 i_size = filestat.st_size; 179 if (out_of_mem) { 180 set_hunkmax(); /* make sure dynamic arrays are allocated */ 181 out_of_mem = FALSE; 182 return FALSE; /* force plan b because plan a bombed */ 183 } 184 if (i_size > SIZE_MAX - 2) 185 fatal("block too large to allocate"); 186 i_womp = malloc((size_t)(i_size + 2)); 187 if (i_womp == NULL) 188 return FALSE; 189 if ((ifd = open(filename, O_RDONLY)) < 0) 190 pfatal("can't open file %s", filename); 191 192 if (read(ifd, i_womp, (size_t) i_size) != i_size) { 193 close(ifd); /* probably means i_size > 15 or 16 bits worth */ 194 free(i_womp); /* at this point it doesn't matter if i_womp was */ 195 return FALSE; /* undersized. */ 196 } 197 198 close(ifd); 199 if (i_size && i_womp[i_size - 1] != '\n') 200 i_womp[i_size++] = '\n'; 201 i_womp[i_size] = '\0'; 202 203 /* count the lines in the buffer so we know how many pointers we need */ 204 205 iline = 0; 206 for (s = i_womp; *s; s++) { 207 if (*s == '\n') 208 iline++; 209 } 210 211 i_ptr = (char **) malloc((iline + 2) * sizeof(char *)); 212 213 if (i_ptr == NULL) { /* shucks, it was a near thing */ 214 free(i_womp); 215 return FALSE; 216 } 217 /* now scan the buffer and build pointer array */ 218 219 iline = 1; 220 i_ptr[iline] = i_womp; 221 for (s = i_womp; *s; s++) { 222 if (*s == '\n') 223 i_ptr[++iline] = s + 1; /* these are NOT NUL terminated */ 224 } 225 input_lines = iline - 1; 226 227 /* now check for revision, if any */ 228 229 if (revision != NULL) { 230 if (!rev_in_string(i_womp)) { 231 if (force) { 232 if (verbose) 233 say("Warning: this file doesn't appear " 234 "to be the %s version--patching anyway.\n", 235 revision); 236 } else if (batch) { 237 fatal("this file doesn't appear to be the " 238 "%s version--aborting.\n", 239 revision); 240 } else { 241 ask("This file doesn't appear to be the " 242 "%s version--patch anyway? [n] ", 243 revision); 244 if (*buf != 'y') 245 fatal("aborted\n"); 246 } 247 } else if (verbose) 248 say("Good. This file appears to be the %s version.\n", 249 revision); 250 } 251 return TRUE; /* plan a will work */ 252 } 253 254 /* Keep (virtually) nothing in memory. */ 255 256 static void 257 plan_b(const char *filename) 258 { 259 FILE *ifp; 260 int i = 0, maxlen = 1; 261 bool found_revision = (revision == NULL); 262 263 using_plan_a = FALSE; 264 if ((ifp = fopen(filename, "r")) == NULL) 265 pfatal("can't open file %s", filename); 266 (void) unlink(TMPINNAME); 267 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 268 pfatal("can't open file %s", TMPINNAME); 269 while (fgets(buf, sizeof buf, ifp) != NULL) { 270 if (revision != NULL && !found_revision && rev_in_string(buf)) 271 found_revision = TRUE; 272 if ((i = strlen(buf)) > maxlen) 273 maxlen = i; /* find longest line */ 274 } 275 if (revision != NULL) { 276 if (!found_revision) { 277 if (force) { 278 if (verbose) 279 say("Warning: this file doesn't appear " 280 "to be the %s version--patching anyway.\n", 281 revision); 282 } else if (batch) { 283 fatal("this file doesn't appear to be the " 284 "%s version--aborting.\n", 285 revision); 286 } else { 287 ask("This file doesn't appear to be the %s " 288 "version--patch anyway? [n] ", 289 revision); 290 if (*buf != 'y') 291 fatal("aborted\n"); 292 } 293 } else if (verbose) 294 say("Good. This file appears to be the %s version.\n", 295 revision); 296 } 297 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 298 lines_per_buf = BUFFERSIZE / maxlen; 299 tireclen = maxlen; 300 tibuf[0] = malloc(BUFFERSIZE + 1); 301 if (tibuf[0] == NULL) 302 fatal("out of memory\n"); 303 tibuf[1] = malloc(BUFFERSIZE + 1); 304 if (tibuf[1] == NULL) 305 fatal("out of memory\n"); 306 for (i = 1;; i++) { 307 if (!(i % lines_per_buf)) /* new block */ 308 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 309 pfatal("can't write temp file"); 310 if (fgets(tibuf[0] + maxlen * (i % lines_per_buf), 311 maxlen + 1, ifp) == NULL) { 312 input_lines = i - 1; 313 if (i % lines_per_buf) 314 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 315 pfatal("can't write temp file"); 316 break; 317 } 318 } 319 fclose(ifp); 320 close(tifd); 321 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 322 pfatal("can't reopen file %s", TMPINNAME); 323 } 324 325 /* 326 * Fetch a line from the input file, \n terminated, not necessarily \0. 327 */ 328 char * 329 ifetch(LINENUM line, int whichbuf) 330 { 331 if (line < 1 || line > input_lines) { 332 say("No such line %ld in input file, ignoring\n", line); 333 return NULL; 334 } 335 if (using_plan_a) 336 return i_ptr[line]; 337 else { 338 LINENUM offline = line % lines_per_buf; 339 LINENUM baseline = line - offline; 340 341 if (tiline[0] == baseline) 342 whichbuf = 0; 343 else if (tiline[1] == baseline) 344 whichbuf = 1; 345 else { 346 tiline[whichbuf] = baseline; 347 348 lseek(tifd, (off_t) (baseline / lines_per_buf * 349 BUFFERSIZE), SEEK_SET); 350 351 if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) 352 pfatal("error reading tmp file %s", TMPINNAME); 353 } 354 return tibuf[whichbuf] + (tireclen * offline); 355 } 356 } 357 358 /* 359 * True if the string argument contains the revision number we want. 360 */ 361 static bool 362 rev_in_string(const char *string) 363 { 364 const char *s; 365 int patlen; 366 367 if (revision == NULL) 368 return TRUE; 369 patlen = strlen(revision); 370 if (strnEQ(string, revision, patlen) && isspace(string[patlen])) 371 return TRUE; 372 for (s = string; *s; s++) { 373 if (isspace(*s) && strnEQ(s + 1, revision, patlen) && 374 isspace(s[patlen + 1])) { 375 return TRUE; 376 } 377 } 378 return FALSE; 379 } 380