Annotation of src/usr.bin/patch/inp.c, Revision 1.42
1.42 ! tobias 1: /* $OpenBSD: inp.c,v 1.41 2014/11/25 10:22:08 tobias Exp $ */
1.28 otto 2:
3: /*
4: * patch - a program to apply diffs to original files
5: *
6: * Copyright 1986, Larry Wall
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following condition is met:
10: * 1. Redistributions of source code must retain the above copyright notice,
11: * this condition and the following disclaimer.
12: *
13: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
14: * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16: * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
17: * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
19: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
20: * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23: * SUCH DAMAGE.
24: *
25: * -C option added in 1998, original code by Marc Espie, based on FreeBSD
26: * behaviour
27: */
1.1 deraadt 28:
1.16 otto 29: #include <sys/types.h>
30: #include <sys/file.h>
31: #include <sys/stat.h>
1.23 otto 32: #include <sys/mman.h>
1.16 otto 33:
34: #include <ctype.h>
35: #include <libgen.h>
36: #include <limits.h>
1.23 otto 37: #include <stddef.h>
1.19 otto 38: #include <stdio.h>
1.16 otto 39: #include <stdlib.h>
40: #include <string.h>
41: #include <unistd.h>
42:
1.1 deraadt 43: #include "common.h"
44: #include "util.h"
45: #include "pch.h"
46: #include "inp.h"
47:
1.7 espie 48:
1.1 deraadt 49: /* Input-file-with-indexable-lines abstract type */
50:
1.12 deraadt 51: static off_t i_size; /* size of the input file */
52: static char *i_womp; /* plan a buffer for entire file */
53: static char **i_ptr; /* pointers to lines in i_womp */
54:
55: static int tifd = -1; /* plan b virtual string array */
56: static char *tibuf[2]; /* plan b buffers */
57: static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
1.42 ! tobias 58: static size_t lines_per_buf; /* how many lines per buffer */
! 59: static size_t tibuflen; /* plan b buffer length */
! 60: static size_t tireclen; /* length of records in tmp file */
1.1 deraadt 61:
1.19 otto 62: static bool rev_in_string(const char *);
1.25 otto 63: static bool reallocate_lines(size_t *);
1.19 otto 64:
65: /* returns false if insufficient memory */
66: static bool plan_a(const char *);
67:
68: static void plan_b(const char *);
1.11 deraadt 69:
1.1 deraadt 70: /* New patch--prepare to edit another file. */
71:
72: void
1.11 deraadt 73: re_input(void)
1.1 deraadt 74: {
1.12 deraadt 75: if (using_plan_a) {
1.16 otto 76: free(i_ptr);
77: i_ptr = NULL;
1.23 otto 78: if (i_womp != NULL) {
79: munmap(i_womp, i_size);
80: i_womp = NULL;
81: }
1.39 tobias 82: i_size = 0;
1.12 deraadt 83: } else {
1.22 otto 84: using_plan_a = true; /* maybe the next one is smaller */
1.12 deraadt 85: close(tifd);
86: tifd = -1;
87: free(tibuf[0]);
88: free(tibuf[1]);
1.16 otto 89: tibuf[0] = tibuf[1] = NULL;
1.12 deraadt 90: tiline[0] = tiline[1] = -1;
91: tireclen = 0;
92: }
1.1 deraadt 93: }
94:
1.33 miod 95: /* Construct the line index, somehow or other. */
1.1 deraadt 96:
97: void
1.19 otto 98: scan_input(const char *filename)
1.1 deraadt 99: {
1.12 deraadt 100: if (!plan_a(filename))
101: plan_b(filename);
102: if (verbose) {
103: say("Patching file %s using Plan %s...\n", filename,
104: (using_plan_a ? "A" : "B"));
105: }
1.1 deraadt 106: }
107:
1.25 otto 108: static bool
109: reallocate_lines(size_t *lines_allocated)
110: {
1.29 otto 111: char **p;
112: size_t new_size;
1.25 otto 113:
1.29 otto 114: new_size = *lines_allocated * 3 / 2;
1.38 doug 115: p = reallocarray(i_ptr, new_size + 2, sizeof(char *));
1.25 otto 116: if (p == NULL) { /* shucks, it was a near thing */
117: munmap(i_womp, i_size);
118: i_womp = NULL;
119: free(i_ptr);
120: i_ptr = NULL;
1.29 otto 121: *lines_allocated = 0;
1.25 otto 122: return false;
123: }
1.29 otto 124: *lines_allocated = new_size;
1.25 otto 125: i_ptr = p;
126: return true;
127: }
128:
1.1 deraadt 129: /* Try keeping everything in memory. */
130:
1.16 otto 131: static bool
1.19 otto 132: plan_a(const char *filename)
1.1 deraadt 133: {
1.19 otto 134: int ifd, statfailed;
1.23 otto 135: char *p, *s, lbuf[MAXLINELEN];
1.20 deraadt 136: struct stat filestat;
1.23 otto 137: off_t i;
138: ptrdiff_t sz;
1.34 otto 139: size_t iline, lines_allocated;
1.23 otto 140:
141: #ifdef DEBUGGING
142: if (debug & 8)
143: return false;
144: #endif
1.1 deraadt 145:
1.19 otto 146: if (filename == NULL || *filename == '\0')
1.22 otto 147: return false;
1.8 millert 148:
1.1 deraadt 149: statfailed = stat(filename, &filestat);
1.12 deraadt 150: if (statfailed && ok_to_create_file) {
1.1 deraadt 151: if (verbose)
1.12 deraadt 152: say("(Creating file %s...)\n", filename);
153:
154: /*
155: * in check_patch case, we still display `Creating file' even
156: * though we're not. The rule is that -C should be as similar
157: * to normal patch behavior as possible
158: */
159: if (check_only)
1.22 otto 160: return true;
161: makedirs(filename, true);
1.12 deraadt 162: close(creat(filename, 0666));
163: statfailed = stat(filename, &filestat);
164: }
165: if (statfailed && check_only)
166: fatal("%s not found, -C mode, can't probe further\n", filename);
1.40 tobias 167: /* For nonexistent or read-only files, look for RCS versions. */
1.12 deraadt 168: if (statfailed ||
169: /* No one can write to it. */
170: (filestat.st_mode & 0222) == 0 ||
171: /* I can't write to it. */
1.19 otto 172: ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) {
1.16 otto 173: char *cs = NULL, *filebase, *filedir;
1.12 deraadt 174: struct stat cstat;
175:
176: filebase = basename(filename);
177: filedir = dirname(filename);
178:
179: /* Leave room in lbuf for the diff command. */
180: s = lbuf + 20;
181:
182: #define try(f, a1, a2, a3) \
183: (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0)
184:
185: if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
186: try("%s/RCS/%s%s", filedir, filebase, "") ||
187: try("%s/%s%s", filedir, filebase, RCSSUFFIX)) {
188: snprintf(buf, sizeof buf, CHECKOUT, filename);
189: snprintf(lbuf, sizeof lbuf, RCSDIFF, filename);
190: cs = "RCS";
191: } else if (statfailed)
192: fatal("can't find %s\n", filename);
193: /*
194: * else we can't write to it but it's not under a version
195: * control system, so just proceed.
196: */
197: if (cs) {
198: if (!statfailed) {
199: if ((filestat.st_mode & 0222) != 0)
200: /* The owner can write to it. */
201: fatal("file %s seems to be locked "
202: "by somebody else under %s\n",
203: filename, cs);
204: /*
205: * It might be checked out unlocked. See if
206: * it's safe to check out the default version
207: * locked.
208: */
209: if (verbose)
210: say("Comparing file %s to default "
211: "%s version...\n",
212: filename, cs);
213: if (system(lbuf))
214: fatal("can't check out file %s: "
215: "differs from default %s version\n",
216: filename, cs);
217: }
218: if (verbose)
219: say("Checking out file %s from %s...\n",
220: filename, cs);
221: if (system(buf) || stat(filename, &filestat))
222: fatal("can't check out file %s from %s\n",
223: filename, cs);
224: }
225: }
226: filemode = filestat.st_mode;
227: if (!S_ISREG(filemode))
228: fatal("%s is not a normal file--can't patch\n", filename);
229: i_size = filestat.st_size;
230: if (out_of_mem) {
231: set_hunkmax(); /* make sure dynamic arrays are allocated */
1.22 otto 232: out_of_mem = false;
233: return false; /* force plan b because plan a bombed */
1.12 deraadt 234: }
1.23 otto 235: if (i_size > SIZE_MAX) {
236: say("block too large to mmap\n");
1.24 deraadt 237: return false;
1.23 otto 238: }
1.12 deraadt 239: if ((ifd = open(filename, O_RDONLY)) < 0)
240: pfatal("can't open file %s", filename);
1.16 otto 241:
1.36 ajacouto 242: if (i_size) {
243: i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
244: if (i_womp == MAP_FAILED) {
245: perror("mmap failed");
246: i_womp = NULL;
247: close(ifd);
248: return false;
249: }
250: } else {
1.23 otto 251: i_womp = NULL;
1.12 deraadt 252: }
1.16 otto 253:
1.12 deraadt 254: close(ifd);
1.30 mickey 255: if (i_size)
256: madvise(i_womp, i_size, MADV_SEQUENTIAL);
1.12 deraadt 257:
1.25 otto 258: /* estimate the number of lines */
259: lines_allocated = i_size / 25;
260: if (lines_allocated < 100)
261: lines_allocated = 100;
1.12 deraadt 262:
1.32 deraadt 263: if (!reallocate_lines(&lines_allocated))
1.24 deraadt 264: return false;
1.23 otto 265:
1.12 deraadt 266: /* now scan the buffer and build pointer array */
267: iline = 1;
268: i_ptr[iline] = i_womp;
1.23 otto 269: /* test for NUL too, to maintain the behavior of the original code */
270: for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
1.25 otto 271: if (*s == '\n') {
272: if (iline == lines_allocated) {
273: if (!reallocate_lines(&lines_allocated))
274: return false;
275: }
276: /* these are NOT NUL terminated */
277: i_ptr[++iline] = s + 1;
278: }
1.12 deraadt 279: }
1.23 otto 280: /* if the last line contains no EOL, append one */
281: if (i_size > 0 && i_womp[i_size - 1] != '\n') {
1.26 otto 282: last_line_missing_eol = true;
1.23 otto 283: /* fix last line */
284: sz = s - i_ptr[iline];
285: p = malloc(sz + 1);
286: if (p == NULL) {
287: free(i_ptr);
288: i_ptr = NULL;
289: munmap(i_womp, i_size);
290: i_womp = NULL;
291: return false;
292: }
1.24 deraadt 293:
1.23 otto 294: memcpy(p, i_ptr[iline], sz);
295: p[sz] = '\n';
296: i_ptr[iline] = p;
297: /* count the extra line and make it point to some valid mem */
298: i_ptr[++iline] = "";
1.26 otto 299: } else
300: last_line_missing_eol = false;
1.23 otto 301:
1.12 deraadt 302: input_lines = iline - 1;
1.11 deraadt 303:
1.12 deraadt 304: /* now check for revision, if any */
1.1 deraadt 305:
1.16 otto 306: if (revision != NULL) {
1.41 tobias 307: if (i_womp == NULL || !rev_in_string(i_womp)) {
1.12 deraadt 308: if (force) {
309: if (verbose)
310: say("Warning: this file doesn't appear "
311: "to be the %s version--patching anyway.\n",
312: revision);
313: } else if (batch) {
314: fatal("this file doesn't appear to be the "
315: "%s version--aborting.\n",
316: revision);
317: } else {
318: ask("This file doesn't appear to be the "
319: "%s version--patch anyway? [n] ",
320: revision);
321: if (*buf != 'y')
322: fatal("aborted\n");
323: }
324: } else if (verbose)
325: say("Good. This file appears to be the %s version.\n",
326: revision);
327: }
1.22 otto 328: return true; /* plan a will work */
1.1 deraadt 329: }
330:
331: /* Keep (virtually) nothing in memory. */
332:
1.16 otto 333: static void
1.19 otto 334: plan_b(const char *filename)
1.1 deraadt 335: {
1.12 deraadt 336: FILE *ifp;
1.42 ! tobias 337: size_t i = 0, j, len, maxlen = 1;
! 338: char *lbuf = NULL, *p;
1.16 otto 339: bool found_revision = (revision == NULL);
1.12 deraadt 340:
1.22 otto 341: using_plan_a = false;
1.16 otto 342: if ((ifp = fopen(filename, "r")) == NULL)
1.12 deraadt 343: pfatal("can't open file %s", filename);
344: (void) unlink(TMPINNAME);
345: if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
346: pfatal("can't open file %s", TMPINNAME);
1.42 ! tobias 347: while ((p = fgetln(ifp, &len)) != NULL) {
! 348: if (p[len - 1] == '\n')
! 349: p[len - 1] = '\0';
! 350: else {
! 351: /* EOF without EOL, copy and add the NUL */
! 352: if ((lbuf = malloc(len + 1)) == NULL)
! 353: fatal("out of memory\n");
! 354: memcpy(lbuf, p, len);
! 355: lbuf[len] = '\0';
! 356: p = lbuf;
! 357:
! 358: last_line_missing_eol = true;
! 359: len++;
! 360: }
! 361: if (revision != NULL && !found_revision && rev_in_string(p))
1.22 otto 362: found_revision = true;
1.42 ! tobias 363: if (len > maxlen)
! 364: maxlen = len; /* find longest line */
1.12 deraadt 365: }
1.42 ! tobias 366: free(lbuf);
! 367: if (ferror(ifp))
! 368: pfatal("can't read file %s", filename);
1.32 deraadt 369:
1.16 otto 370: if (revision != NULL) {
1.12 deraadt 371: if (!found_revision) {
372: if (force) {
373: if (verbose)
374: say("Warning: this file doesn't appear "
375: "to be the %s version--patching anyway.\n",
376: revision);
377: } else if (batch) {
378: fatal("this file doesn't appear to be the "
379: "%s version--aborting.\n",
380: revision);
381: } else {
382: ask("This file doesn't appear to be the %s "
383: "version--patch anyway? [n] ",
384: revision);
385: if (*buf != 'y')
386: fatal("aborted\n");
387: }
388: } else if (verbose)
389: say("Good. This file appears to be the %s version.\n",
390: revision);
391: }
1.16 otto 392: fseek(ifp, 0L, SEEK_SET); /* rewind file */
1.12 deraadt 393: tireclen = maxlen;
1.42 ! tobias 394: tibuflen = maxlen > BUFFERSIZE ? maxlen : BUFFERSIZE;
! 395: lines_per_buf = tibuflen / maxlen;
! 396: tibuf[0] = malloc(tibuflen + 1);
1.16 otto 397: if (tibuf[0] == NULL)
1.12 deraadt 398: fatal("out of memory\n");
1.42 ! tobias 399: tibuf[1] = malloc(tibuflen + 1);
1.16 otto 400: if (tibuf[1] == NULL)
1.12 deraadt 401: fatal("out of memory\n");
402: for (i = 1;; i++) {
1.27 otto 403: p = tibuf[0] + maxlen * (i % lines_per_buf);
404: if (i % lines_per_buf == 0) /* new block */
1.42 ! tobias 405: if (write(tifd, tibuf[0], tibuflen) !=
! 406: (ssize_t) tibuflen)
1.12 deraadt 407: pfatal("can't write temp file");
1.27 otto 408: if (fgets(p, maxlen + 1, ifp) == NULL) {
1.12 deraadt 409: input_lines = i - 1;
1.27 otto 410: if (i % lines_per_buf != 0)
1.42 ! tobias 411: if (write(tifd, tibuf[0], tibuflen) !=
! 412: (ssize_t) tibuflen)
1.12 deraadt 413: pfatal("can't write temp file");
414: break;
415: }
1.27 otto 416: j = strlen(p);
417: /* These are '\n' terminated strings, so no need to add a NUL */
418: if (j == 0 || p[j - 1] != '\n')
419: p[j] = '\n';
1.12 deraadt 420: }
421: fclose(ifp);
422: close(tifd);
423: if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
424: pfatal("can't reopen file %s", TMPINNAME);
1.1 deraadt 425: }
426:
1.12 deraadt 427: /*
428: * Fetch a line from the input file, \n terminated, not necessarily \0.
429: */
1.1 deraadt 430: char *
1.12 deraadt 431: ifetch(LINENUM line, int whichbuf)
1.1 deraadt 432: {
1.12 deraadt 433: if (line < 1 || line > input_lines) {
1.21 otto 434: if (warn_on_invalid_line) {
435: say("No such line %ld in input file, ignoring\n", line);
1.22 otto 436: warn_on_invalid_line = false;
1.21 otto 437: }
1.18 otto 438: return NULL;
1.12 deraadt 439: }
440: if (using_plan_a)
441: return i_ptr[line];
1.1 deraadt 442: else {
1.12 deraadt 443: LINENUM offline = line % lines_per_buf;
444: LINENUM baseline = line - offline;
445:
446: if (tiline[0] == baseline)
447: whichbuf = 0;
448: else if (tiline[1] == baseline)
449: whichbuf = 1;
450: else {
451: tiline[whichbuf] = baseline;
1.16 otto 452:
1.34 otto 453: if (lseek(tifd, (off_t) (baseline / lines_per_buf *
1.42 ! tobias 454: tibuflen), SEEK_SET) < 0)
1.34 otto 455: pfatal("cannot seek in the temporary input file");
1.16 otto 456:
1.42 ! tobias 457: if (read(tifd, tibuf[whichbuf], tibuflen)
! 458: != (ssize_t) tibuflen)
1.12 deraadt 459: pfatal("error reading tmp file %s", TMPINNAME);
460: }
461: return tibuf[whichbuf] + (tireclen * offline);
1.1 deraadt 462: }
463: }
464:
1.12 deraadt 465: /*
466: * True if the string argument contains the revision number we want.
467: */
1.16 otto 468: static bool
1.19 otto 469: rev_in_string(const char *string)
1.1 deraadt 470: {
1.19 otto 471: const char *s;
1.34 otto 472: size_t patlen;
1.1 deraadt 473:
1.16 otto 474: if (revision == NULL)
1.22 otto 475: return true;
1.12 deraadt 476: patlen = strlen(revision);
1.37 deraadt 477: if (strnEQ(string, revision, patlen) &&
478: isspace((unsigned char)string[patlen]))
1.22 otto 479: return true;
1.12 deraadt 480: for (s = string; *s; s++) {
1.37 deraadt 481: if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
482: isspace((unsigned char)s[patlen + 1])) {
1.22 otto 483: return true;
1.12 deraadt 484: }
1.1 deraadt 485: }
1.22 otto 486: return false;
1.1 deraadt 487: }
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