Annotation of src/usr.bin/patch/inp.c, Revision 1.41
1.41 ! tobias 1: /* $OpenBSD: inp.c,v 1.40 2014/11/22 15:49:28 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 */
58: static LINENUM lines_per_buf; /* how many lines per buffer */
59: static int tireclen; /* length of records in tmp file */
1.1 deraadt 60:
1.19 otto 61: static bool rev_in_string(const char *);
1.25 otto 62: static bool reallocate_lines(size_t *);
1.19 otto 63:
64: /* returns false if insufficient memory */
65: static bool plan_a(const char *);
66:
67: static void plan_b(const char *);
1.11 deraadt 68:
1.1 deraadt 69: /* New patch--prepare to edit another file. */
70:
71: void
1.11 deraadt 72: re_input(void)
1.1 deraadt 73: {
1.12 deraadt 74: if (using_plan_a) {
1.16 otto 75: free(i_ptr);
76: i_ptr = NULL;
1.23 otto 77: if (i_womp != NULL) {
78: munmap(i_womp, i_size);
79: i_womp = NULL;
80: }
1.39 tobias 81: i_size = 0;
1.12 deraadt 82: } else {
1.22 otto 83: using_plan_a = true; /* maybe the next one is smaller */
1.12 deraadt 84: close(tifd);
85: tifd = -1;
86: free(tibuf[0]);
87: free(tibuf[1]);
1.16 otto 88: tibuf[0] = tibuf[1] = NULL;
1.12 deraadt 89: tiline[0] = tiline[1] = -1;
90: tireclen = 0;
91: }
1.1 deraadt 92: }
93:
1.33 miod 94: /* Construct the line index, somehow or other. */
1.1 deraadt 95:
96: void
1.19 otto 97: scan_input(const char *filename)
1.1 deraadt 98: {
1.12 deraadt 99: if (!plan_a(filename))
100: plan_b(filename);
101: if (verbose) {
102: say("Patching file %s using Plan %s...\n", filename,
103: (using_plan_a ? "A" : "B"));
104: }
1.1 deraadt 105: }
106:
1.25 otto 107: static bool
108: reallocate_lines(size_t *lines_allocated)
109: {
1.29 otto 110: char **p;
111: size_t new_size;
1.25 otto 112:
1.29 otto 113: new_size = *lines_allocated * 3 / 2;
1.38 doug 114: p = reallocarray(i_ptr, new_size + 2, sizeof(char *));
1.25 otto 115: if (p == NULL) { /* shucks, it was a near thing */
116: munmap(i_womp, i_size);
117: i_womp = NULL;
118: free(i_ptr);
119: i_ptr = NULL;
1.29 otto 120: *lines_allocated = 0;
1.25 otto 121: return false;
122: }
1.29 otto 123: *lines_allocated = new_size;
1.25 otto 124: i_ptr = p;
125: return true;
126: }
127:
1.1 deraadt 128: /* Try keeping everything in memory. */
129:
1.16 otto 130: static bool
1.19 otto 131: plan_a(const char *filename)
1.1 deraadt 132: {
1.19 otto 133: int ifd, statfailed;
1.23 otto 134: char *p, *s, lbuf[MAXLINELEN];
1.20 deraadt 135: struct stat filestat;
1.23 otto 136: off_t i;
137: ptrdiff_t sz;
1.34 otto 138: size_t iline, lines_allocated;
1.23 otto 139:
140: #ifdef DEBUGGING
141: if (debug & 8)
142: return false;
143: #endif
1.1 deraadt 144:
1.19 otto 145: if (filename == NULL || *filename == '\0')
1.22 otto 146: return false;
1.8 millert 147:
1.1 deraadt 148: statfailed = stat(filename, &filestat);
1.12 deraadt 149: if (statfailed && ok_to_create_file) {
1.1 deraadt 150: if (verbose)
1.12 deraadt 151: say("(Creating file %s...)\n", filename);
152:
153: /*
154: * in check_patch case, we still display `Creating file' even
155: * though we're not. The rule is that -C should be as similar
156: * to normal patch behavior as possible
157: */
158: if (check_only)
1.22 otto 159: return true;
160: makedirs(filename, true);
1.12 deraadt 161: close(creat(filename, 0666));
162: statfailed = stat(filename, &filestat);
163: }
164: if (statfailed && check_only)
165: fatal("%s not found, -C mode, can't probe further\n", filename);
1.40 tobias 166: /* For nonexistent or read-only files, look for RCS versions. */
1.12 deraadt 167: if (statfailed ||
168: /* No one can write to it. */
169: (filestat.st_mode & 0222) == 0 ||
170: /* I can't write to it. */
1.19 otto 171: ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) {
1.16 otto 172: char *cs = NULL, *filebase, *filedir;
1.12 deraadt 173: struct stat cstat;
174:
175: filebase = basename(filename);
176: filedir = dirname(filename);
177:
178: /* Leave room in lbuf for the diff command. */
179: s = lbuf + 20;
180:
181: #define try(f, a1, a2, a3) \
182: (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0)
183:
184: if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
185: try("%s/RCS/%s%s", filedir, filebase, "") ||
186: try("%s/%s%s", filedir, filebase, RCSSUFFIX)) {
187: snprintf(buf, sizeof buf, CHECKOUT, filename);
188: snprintf(lbuf, sizeof lbuf, RCSDIFF, filename);
189: cs = "RCS";
190: } else if (statfailed)
191: fatal("can't find %s\n", filename);
192: /*
193: * else we can't write to it but it's not under a version
194: * control system, so just proceed.
195: */
196: if (cs) {
197: if (!statfailed) {
198: if ((filestat.st_mode & 0222) != 0)
199: /* The owner can write to it. */
200: fatal("file %s seems to be locked "
201: "by somebody else under %s\n",
202: filename, cs);
203: /*
204: * It might be checked out unlocked. See if
205: * it's safe to check out the default version
206: * locked.
207: */
208: if (verbose)
209: say("Comparing file %s to default "
210: "%s version...\n",
211: filename, cs);
212: if (system(lbuf))
213: fatal("can't check out file %s: "
214: "differs from default %s version\n",
215: filename, cs);
216: }
217: if (verbose)
218: say("Checking out file %s from %s...\n",
219: filename, cs);
220: if (system(buf) || stat(filename, &filestat))
221: fatal("can't check out file %s from %s\n",
222: filename, cs);
223: }
224: }
225: filemode = filestat.st_mode;
226: if (!S_ISREG(filemode))
227: fatal("%s is not a normal file--can't patch\n", filename);
228: i_size = filestat.st_size;
229: if (out_of_mem) {
230: set_hunkmax(); /* make sure dynamic arrays are allocated */
1.22 otto 231: out_of_mem = false;
232: return false; /* force plan b because plan a bombed */
1.12 deraadt 233: }
1.23 otto 234: if (i_size > SIZE_MAX) {
235: say("block too large to mmap\n");
1.24 deraadt 236: return false;
1.23 otto 237: }
1.12 deraadt 238: if ((ifd = open(filename, O_RDONLY)) < 0)
239: pfatal("can't open file %s", filename);
1.16 otto 240:
1.36 ajacouto 241: if (i_size) {
242: i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
243: if (i_womp == MAP_FAILED) {
244: perror("mmap failed");
245: i_womp = NULL;
246: close(ifd);
247: return false;
248: }
249: } else {
1.23 otto 250: i_womp = NULL;
1.12 deraadt 251: }
1.16 otto 252:
1.12 deraadt 253: close(ifd);
1.30 mickey 254: if (i_size)
255: madvise(i_womp, i_size, MADV_SEQUENTIAL);
1.12 deraadt 256:
1.25 otto 257: /* estimate the number of lines */
258: lines_allocated = i_size / 25;
259: if (lines_allocated < 100)
260: lines_allocated = 100;
1.12 deraadt 261:
1.32 deraadt 262: if (!reallocate_lines(&lines_allocated))
1.24 deraadt 263: return false;
1.23 otto 264:
1.12 deraadt 265: /* now scan the buffer and build pointer array */
266: iline = 1;
267: i_ptr[iline] = i_womp;
1.23 otto 268: /* test for NUL too, to maintain the behavior of the original code */
269: for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
1.25 otto 270: if (*s == '\n') {
271: if (iline == lines_allocated) {
272: if (!reallocate_lines(&lines_allocated))
273: return false;
274: }
275: /* these are NOT NUL terminated */
276: i_ptr[++iline] = s + 1;
277: }
1.12 deraadt 278: }
1.23 otto 279: /* if the last line contains no EOL, append one */
280: if (i_size > 0 && i_womp[i_size - 1] != '\n') {
1.26 otto 281: last_line_missing_eol = true;
1.23 otto 282: /* fix last line */
283: sz = s - i_ptr[iline];
284: p = malloc(sz + 1);
285: if (p == NULL) {
286: free(i_ptr);
287: i_ptr = NULL;
288: munmap(i_womp, i_size);
289: i_womp = NULL;
290: return false;
291: }
1.24 deraadt 292:
1.23 otto 293: memcpy(p, i_ptr[iline], sz);
294: p[sz] = '\n';
295: i_ptr[iline] = p;
296: /* count the extra line and make it point to some valid mem */
297: i_ptr[++iline] = "";
1.26 otto 298: } else
299: last_line_missing_eol = false;
1.23 otto 300:
1.12 deraadt 301: input_lines = iline - 1;
1.11 deraadt 302:
1.12 deraadt 303: /* now check for revision, if any */
1.1 deraadt 304:
1.16 otto 305: if (revision != NULL) {
1.41 ! tobias 306: if (i_womp == NULL || !rev_in_string(i_womp)) {
1.12 deraadt 307: if (force) {
308: if (verbose)
309: say("Warning: this file doesn't appear "
310: "to be the %s version--patching anyway.\n",
311: revision);
312: } else if (batch) {
313: fatal("this file doesn't appear to be the "
314: "%s version--aborting.\n",
315: revision);
316: } else {
317: ask("This file doesn't appear to be the "
318: "%s version--patch anyway? [n] ",
319: revision);
320: if (*buf != 'y')
321: fatal("aborted\n");
322: }
323: } else if (verbose)
324: say("Good. This file appears to be the %s version.\n",
325: revision);
326: }
1.22 otto 327: return true; /* plan a will work */
1.1 deraadt 328: }
329:
330: /* Keep (virtually) nothing in memory. */
331:
1.16 otto 332: static void
1.19 otto 333: plan_b(const char *filename)
1.1 deraadt 334: {
1.12 deraadt 335: FILE *ifp;
1.34 otto 336: size_t i = 0, j, maxlen = 1;
1.27 otto 337: char *p;
1.16 otto 338: bool found_revision = (revision == NULL);
1.12 deraadt 339:
1.22 otto 340: using_plan_a = false;
1.16 otto 341: if ((ifp = fopen(filename, "r")) == NULL)
1.12 deraadt 342: pfatal("can't open file %s", filename);
343: (void) unlink(TMPINNAME);
344: if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
345: pfatal("can't open file %s", TMPINNAME);
1.16 otto 346: while (fgets(buf, sizeof buf, ifp) != NULL) {
347: if (revision != NULL && !found_revision && rev_in_string(buf))
1.22 otto 348: found_revision = true;
1.12 deraadt 349: if ((i = strlen(buf)) > maxlen)
350: maxlen = i; /* find longest line */
351: }
1.27 otto 352: last_line_missing_eol = i > 0 && buf[i - 1] != '\n';
353: if (last_line_missing_eol && maxlen == i)
354: maxlen++;
1.32 deraadt 355:
1.16 otto 356: if (revision != NULL) {
1.12 deraadt 357: if (!found_revision) {
358: if (force) {
359: if (verbose)
360: say("Warning: this file doesn't appear "
361: "to be the %s version--patching anyway.\n",
362: revision);
363: } else if (batch) {
364: fatal("this file doesn't appear to be the "
365: "%s version--aborting.\n",
366: revision);
367: } else {
368: ask("This file doesn't appear to be the %s "
369: "version--patch anyway? [n] ",
370: revision);
371: if (*buf != 'y')
372: fatal("aborted\n");
373: }
374: } else if (verbose)
375: say("Good. This file appears to be the %s version.\n",
376: revision);
377: }
1.16 otto 378: fseek(ifp, 0L, SEEK_SET); /* rewind file */
1.12 deraadt 379: lines_per_buf = BUFFERSIZE / maxlen;
380: tireclen = maxlen;
1.13 deraadt 381: tibuf[0] = malloc(BUFFERSIZE + 1);
1.16 otto 382: if (tibuf[0] == NULL)
1.12 deraadt 383: fatal("out of memory\n");
1.13 deraadt 384: tibuf[1] = malloc(BUFFERSIZE + 1);
1.16 otto 385: if (tibuf[1] == NULL)
1.12 deraadt 386: fatal("out of memory\n");
387: for (i = 1;; i++) {
1.27 otto 388: p = tibuf[0] + maxlen * (i % lines_per_buf);
389: if (i % lines_per_buf == 0) /* new block */
1.12 deraadt 390: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
391: pfatal("can't write temp file");
1.27 otto 392: if (fgets(p, maxlen + 1, ifp) == NULL) {
1.12 deraadt 393: input_lines = i - 1;
1.27 otto 394: if (i % lines_per_buf != 0)
1.12 deraadt 395: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
396: pfatal("can't write temp file");
397: break;
398: }
1.27 otto 399: j = strlen(p);
400: /* These are '\n' terminated strings, so no need to add a NUL */
401: if (j == 0 || p[j - 1] != '\n')
402: p[j] = '\n';
1.12 deraadt 403: }
404: fclose(ifp);
405: close(tifd);
406: if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
407: pfatal("can't reopen file %s", TMPINNAME);
1.1 deraadt 408: }
409:
1.12 deraadt 410: /*
411: * Fetch a line from the input file, \n terminated, not necessarily \0.
412: */
1.1 deraadt 413: char *
1.12 deraadt 414: ifetch(LINENUM line, int whichbuf)
1.1 deraadt 415: {
1.12 deraadt 416: if (line < 1 || line > input_lines) {
1.21 otto 417: if (warn_on_invalid_line) {
418: say("No such line %ld in input file, ignoring\n", line);
1.22 otto 419: warn_on_invalid_line = false;
1.21 otto 420: }
1.18 otto 421: return NULL;
1.12 deraadt 422: }
423: if (using_plan_a)
424: return i_ptr[line];
1.1 deraadt 425: else {
1.12 deraadt 426: LINENUM offline = line % lines_per_buf;
427: LINENUM baseline = line - offline;
428:
429: if (tiline[0] == baseline)
430: whichbuf = 0;
431: else if (tiline[1] == baseline)
432: whichbuf = 1;
433: else {
434: tiline[whichbuf] = baseline;
1.16 otto 435:
1.34 otto 436: if (lseek(tifd, (off_t) (baseline / lines_per_buf *
437: BUFFERSIZE), SEEK_SET) < 0)
438: pfatal("cannot seek in the temporary input file");
1.16 otto 439:
1.12 deraadt 440: if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
441: pfatal("error reading tmp file %s", TMPINNAME);
442: }
443: return tibuf[whichbuf] + (tireclen * offline);
1.1 deraadt 444: }
445: }
446:
1.12 deraadt 447: /*
448: * True if the string argument contains the revision number we want.
449: */
1.16 otto 450: static bool
1.19 otto 451: rev_in_string(const char *string)
1.1 deraadt 452: {
1.19 otto 453: const char *s;
1.34 otto 454: size_t patlen;
1.1 deraadt 455:
1.16 otto 456: if (revision == NULL)
1.22 otto 457: return true;
1.12 deraadt 458: patlen = strlen(revision);
1.37 deraadt 459: if (strnEQ(string, revision, patlen) &&
460: isspace((unsigned char)string[patlen]))
1.22 otto 461: return true;
1.12 deraadt 462: for (s = string; *s; s++) {
1.37 deraadt 463: if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
464: isspace((unsigned char)s[patlen + 1])) {
1.22 otto 465: return true;
1.12 deraadt 466: }
1.1 deraadt 467: }
1.22 otto 468: return false;
1.1 deraadt 469: }
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