Annotation of src/usr.bin/patch/inp.c, Revision 1.33
1.33 ! miod 1: /* $OpenBSD: inp.c,v 1.32 2004/08/05 21:47:24 deraadt 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: */
1.2 niklas 28:
1.1 deraadt 29: #ifndef lint
1.33 ! miod 30: static const char rcsid[] = "$OpenBSD: inp.c,v 1.32 2004/08/05 21:47:24 deraadt Exp $";
1.17 deraadt 31: #endif /* not lint */
1.1 deraadt 32:
1.16 otto 33: #include <sys/types.h>
34: #include <sys/file.h>
35: #include <sys/stat.h>
1.23 otto 36: #include <sys/mman.h>
1.16 otto 37:
38: #include <ctype.h>
39: #include <libgen.h>
40: #include <limits.h>
1.23 otto 41: #include <stddef.h>
1.19 otto 42: #include <stdio.h>
1.16 otto 43: #include <stdlib.h>
44: #include <string.h>
45: #include <unistd.h>
46:
1.1 deraadt 47: #include "common.h"
48: #include "util.h"
49: #include "pch.h"
50: #include "inp.h"
51:
1.7 espie 52:
1.1 deraadt 53: /* Input-file-with-indexable-lines abstract type */
54:
1.12 deraadt 55: static off_t i_size; /* size of the input file */
56: static char *i_womp; /* plan a buffer for entire file */
57: static char **i_ptr; /* pointers to lines in i_womp */
58:
59: static int tifd = -1; /* plan b virtual string array */
60: static char *tibuf[2]; /* plan b buffers */
61: static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
62: static LINENUM lines_per_buf; /* how many lines per buffer */
63: static int tireclen; /* length of records in tmp file */
1.1 deraadt 64:
1.19 otto 65: static bool rev_in_string(const char *);
1.25 otto 66: static bool reallocate_lines(size_t *);
1.19 otto 67:
68: /* returns false if insufficient memory */
69: static bool plan_a(const char *);
70:
71: static void plan_b(const char *);
1.11 deraadt 72:
1.1 deraadt 73: /* New patch--prepare to edit another file. */
74:
75: void
1.11 deraadt 76: re_input(void)
1.1 deraadt 77: {
1.12 deraadt 78: if (using_plan_a) {
79: i_size = 0;
1.16 otto 80: free(i_ptr);
81: i_ptr = NULL;
1.23 otto 82: if (i_womp != NULL) {
83: munmap(i_womp, i_size);
84: i_womp = NULL;
85: }
1.12 deraadt 86: } else {
1.22 otto 87: using_plan_a = true; /* maybe the next one is smaller */
1.12 deraadt 88: close(tifd);
89: tifd = -1;
90: free(tibuf[0]);
91: free(tibuf[1]);
1.16 otto 92: tibuf[0] = tibuf[1] = NULL;
1.12 deraadt 93: tiline[0] = tiline[1] = -1;
94: tireclen = 0;
95: }
1.1 deraadt 96: }
97:
1.33 ! miod 98: /* Construct the line index, somehow or other. */
1.1 deraadt 99:
100: void
1.19 otto 101: scan_input(const char *filename)
1.1 deraadt 102: {
1.12 deraadt 103: if (!plan_a(filename))
104: plan_b(filename);
105: if (verbose) {
106: say("Patching file %s using Plan %s...\n", filename,
107: (using_plan_a ? "A" : "B"));
108: }
1.1 deraadt 109: }
110:
1.25 otto 111: static bool
112: reallocate_lines(size_t *lines_allocated)
113: {
1.29 otto 114: char **p;
115: size_t new_size;
1.25 otto 116:
1.29 otto 117: new_size = *lines_allocated * 3 / 2;
118: p = realloc(i_ptr, (new_size + 2) * sizeof(char *));
1.25 otto 119: if (p == NULL) { /* shucks, it was a near thing */
120: munmap(i_womp, i_size);
121: i_womp = NULL;
122: free(i_ptr);
123: i_ptr = NULL;
1.29 otto 124: *lines_allocated = 0;
1.25 otto 125: return false;
126: }
1.29 otto 127: *lines_allocated = new_size;
1.25 otto 128: i_ptr = p;
129: return true;
130: }
131:
1.1 deraadt 132: /* Try keeping everything in memory. */
133:
1.16 otto 134: static bool
1.19 otto 135: plan_a(const char *filename)
1.1 deraadt 136: {
1.19 otto 137: int ifd, statfailed;
1.23 otto 138: char *p, *s, lbuf[MAXLINELEN];
1.19 otto 139: LINENUM iline;
1.20 deraadt 140: struct stat filestat;
1.23 otto 141: off_t i;
142: ptrdiff_t sz;
1.25 otto 143: size_t lines_allocated;
1.23 otto 144:
145: #ifdef DEBUGGING
146: if (debug & 8)
147: return false;
148: #endif
1.1 deraadt 149:
1.19 otto 150: if (filename == NULL || *filename == '\0')
1.22 otto 151: return false;
1.8 millert 152:
1.1 deraadt 153: statfailed = stat(filename, &filestat);
1.12 deraadt 154: if (statfailed && ok_to_create_file) {
1.1 deraadt 155: if (verbose)
1.12 deraadt 156: say("(Creating file %s...)\n", filename);
157:
158: /*
159: * in check_patch case, we still display `Creating file' even
160: * though we're not. The rule is that -C should be as similar
161: * to normal patch behavior as possible
162: */
163: if (check_only)
1.22 otto 164: return true;
165: makedirs(filename, true);
1.12 deraadt 166: close(creat(filename, 0666));
167: statfailed = stat(filename, &filestat);
168: }
169: if (statfailed && check_only)
170: fatal("%s not found, -C mode, can't probe further\n", filename);
171: /* For nonexistent or read-only files, look for RCS or SCCS versions. */
172: if (statfailed ||
173: /* No one can write to it. */
174: (filestat.st_mode & 0222) == 0 ||
175: /* I can't write to it. */
1.19 otto 176: ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) {
1.16 otto 177: char *cs = NULL, *filebase, *filedir;
1.12 deraadt 178: struct stat cstat;
179:
180: filebase = basename(filename);
181: filedir = dirname(filename);
182:
183: /* Leave room in lbuf for the diff command. */
184: s = lbuf + 20;
185:
186: #define try(f, a1, a2, a3) \
187: (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0)
188:
189: if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
190: try("%s/RCS/%s%s", filedir, filebase, "") ||
191: try("%s/%s%s", filedir, filebase, RCSSUFFIX)) {
192: snprintf(buf, sizeof buf, CHECKOUT, filename);
193: snprintf(lbuf, sizeof lbuf, RCSDIFF, filename);
194: cs = "RCS";
195: } else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) ||
196: try("%s/%s%s", filedir, SCCSPREFIX, filebase)) {
197: snprintf(buf, sizeof buf, GET, s);
198: snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename);
199: cs = "SCCS";
200: } else if (statfailed)
201: fatal("can't find %s\n", filename);
202: /*
203: * else we can't write to it but it's not under a version
204: * control system, so just proceed.
205: */
206: if (cs) {
207: if (!statfailed) {
208: if ((filestat.st_mode & 0222) != 0)
209: /* The owner can write to it. */
210: fatal("file %s seems to be locked "
211: "by somebody else under %s\n",
212: filename, cs);
213: /*
214: * It might be checked out unlocked. See if
215: * it's safe to check out the default version
216: * locked.
217: */
218: if (verbose)
219: say("Comparing file %s to default "
220: "%s version...\n",
221: filename, cs);
222: if (system(lbuf))
223: fatal("can't check out file %s: "
224: "differs from default %s version\n",
225: filename, cs);
226: }
227: if (verbose)
228: say("Checking out file %s from %s...\n",
229: filename, cs);
230: if (system(buf) || stat(filename, &filestat))
231: fatal("can't check out file %s from %s\n",
232: filename, cs);
233: }
234: }
235: filemode = filestat.st_mode;
236: if (!S_ISREG(filemode))
237: fatal("%s is not a normal file--can't patch\n", filename);
238: i_size = filestat.st_size;
239: if (out_of_mem) {
240: set_hunkmax(); /* make sure dynamic arrays are allocated */
1.22 otto 241: out_of_mem = false;
242: return false; /* force plan b because plan a bombed */
1.12 deraadt 243: }
1.23 otto 244: if (i_size > SIZE_MAX) {
245: say("block too large to mmap\n");
1.24 deraadt 246: return false;
1.23 otto 247: }
1.12 deraadt 248: if ((ifd = open(filename, O_RDONLY)) < 0)
249: pfatal("can't open file %s", filename);
1.16 otto 250:
1.31 mickey 251: i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
1.23 otto 252: if (i_womp == MAP_FAILED) {
253: perror("mmap failed");
254: i_womp = NULL;
1.30 mickey 255: close(ifd);
1.23 otto 256: return false;
1.12 deraadt 257: }
1.16 otto 258:
1.12 deraadt 259: close(ifd);
1.30 mickey 260: if (i_size)
261: madvise(i_womp, i_size, MADV_SEQUENTIAL);
1.12 deraadt 262:
1.25 otto 263: /* estimate the number of lines */
264: lines_allocated = i_size / 25;
265: if (lines_allocated < 100)
266: lines_allocated = 100;
1.12 deraadt 267:
1.32 deraadt 268: if (!reallocate_lines(&lines_allocated))
1.24 deraadt 269: return false;
1.23 otto 270:
1.12 deraadt 271: /* now scan the buffer and build pointer array */
272: iline = 1;
273: i_ptr[iline] = i_womp;
1.23 otto 274: /* test for NUL too, to maintain the behavior of the original code */
275: for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
1.25 otto 276: if (*s == '\n') {
277: if (iline == lines_allocated) {
278: if (!reallocate_lines(&lines_allocated))
279: return false;
280: }
281: /* these are NOT NUL terminated */
282: i_ptr[++iline] = s + 1;
283: }
1.12 deraadt 284: }
1.23 otto 285: /* if the last line contains no EOL, append one */
286: if (i_size > 0 && i_womp[i_size - 1] != '\n') {
1.26 otto 287: last_line_missing_eol = true;
1.23 otto 288: /* fix last line */
289: sz = s - i_ptr[iline];
290: p = malloc(sz + 1);
291: if (p == NULL) {
292: free(i_ptr);
293: i_ptr = NULL;
294: munmap(i_womp, i_size);
295: i_womp = NULL;
296: return false;
297: }
1.24 deraadt 298:
1.23 otto 299: memcpy(p, i_ptr[iline], sz);
300: p[sz] = '\n';
301: i_ptr[iline] = p;
302: /* count the extra line and make it point to some valid mem */
303: i_ptr[++iline] = "";
1.26 otto 304: } else
305: last_line_missing_eol = false;
1.23 otto 306:
1.12 deraadt 307: input_lines = iline - 1;
1.11 deraadt 308:
1.12 deraadt 309: /* now check for revision, if any */
1.1 deraadt 310:
1.16 otto 311: if (revision != NULL) {
1.12 deraadt 312: if (!rev_in_string(i_womp)) {
313: if (force) {
314: if (verbose)
315: say("Warning: this file doesn't appear "
316: "to be the %s version--patching anyway.\n",
317: revision);
318: } else if (batch) {
319: fatal("this file doesn't appear to be the "
320: "%s version--aborting.\n",
321: revision);
322: } else {
323: ask("This file doesn't appear to be the "
324: "%s version--patch anyway? [n] ",
325: revision);
326: if (*buf != 'y')
327: fatal("aborted\n");
328: }
329: } else if (verbose)
330: say("Good. This file appears to be the %s version.\n",
331: revision);
332: }
1.22 otto 333: return true; /* plan a will work */
1.1 deraadt 334: }
335:
336: /* Keep (virtually) nothing in memory. */
337:
1.16 otto 338: static void
1.19 otto 339: plan_b(const char *filename)
1.1 deraadt 340: {
1.12 deraadt 341: FILE *ifp;
1.27 otto 342: int i = 0, j, maxlen = 1;
343: char *p;
1.16 otto 344: bool found_revision = (revision == NULL);
1.12 deraadt 345:
1.22 otto 346: using_plan_a = false;
1.16 otto 347: if ((ifp = fopen(filename, "r")) == NULL)
1.12 deraadt 348: pfatal("can't open file %s", filename);
349: (void) unlink(TMPINNAME);
350: if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
351: pfatal("can't open file %s", TMPINNAME);
1.16 otto 352: while (fgets(buf, sizeof buf, ifp) != NULL) {
353: if (revision != NULL && !found_revision && rev_in_string(buf))
1.22 otto 354: found_revision = true;
1.12 deraadt 355: if ((i = strlen(buf)) > maxlen)
356: maxlen = i; /* find longest line */
357: }
1.27 otto 358: last_line_missing_eol = i > 0 && buf[i - 1] != '\n';
359: if (last_line_missing_eol && maxlen == i)
360: maxlen++;
1.32 deraadt 361:
1.16 otto 362: if (revision != NULL) {
1.12 deraadt 363: if (!found_revision) {
364: if (force) {
365: if (verbose)
366: say("Warning: this file doesn't appear "
367: "to be the %s version--patching anyway.\n",
368: revision);
369: } else if (batch) {
370: fatal("this file doesn't appear to be the "
371: "%s version--aborting.\n",
372: revision);
373: } else {
374: ask("This file doesn't appear to be the %s "
375: "version--patch anyway? [n] ",
376: revision);
377: if (*buf != 'y')
378: fatal("aborted\n");
379: }
380: } else if (verbose)
381: say("Good. This file appears to be the %s version.\n",
382: revision);
383: }
1.16 otto 384: fseek(ifp, 0L, SEEK_SET); /* rewind file */
1.12 deraadt 385: lines_per_buf = BUFFERSIZE / maxlen;
386: tireclen = maxlen;
1.13 deraadt 387: tibuf[0] = malloc(BUFFERSIZE + 1);
1.16 otto 388: if (tibuf[0] == NULL)
1.12 deraadt 389: fatal("out of memory\n");
1.13 deraadt 390: tibuf[1] = malloc(BUFFERSIZE + 1);
1.16 otto 391: if (tibuf[1] == NULL)
1.12 deraadt 392: fatal("out of memory\n");
393: for (i = 1;; i++) {
1.27 otto 394: p = tibuf[0] + maxlen * (i % lines_per_buf);
395: if (i % lines_per_buf == 0) /* new block */
1.12 deraadt 396: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
397: pfatal("can't write temp file");
1.27 otto 398: if (fgets(p, maxlen + 1, ifp) == NULL) {
1.12 deraadt 399: input_lines = i - 1;
1.27 otto 400: if (i % lines_per_buf != 0)
1.12 deraadt 401: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
402: pfatal("can't write temp file");
403: break;
404: }
1.27 otto 405: j = strlen(p);
406: /* These are '\n' terminated strings, so no need to add a NUL */
407: if (j == 0 || p[j - 1] != '\n')
408: p[j] = '\n';
1.12 deraadt 409: }
410: fclose(ifp);
411: close(tifd);
412: if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
413: pfatal("can't reopen file %s", TMPINNAME);
1.1 deraadt 414: }
415:
1.12 deraadt 416: /*
417: * Fetch a line from the input file, \n terminated, not necessarily \0.
418: */
1.1 deraadt 419: char *
1.12 deraadt 420: ifetch(LINENUM line, int whichbuf)
1.1 deraadt 421: {
1.12 deraadt 422: if (line < 1 || line > input_lines) {
1.21 otto 423: if (warn_on_invalid_line) {
424: say("No such line %ld in input file, ignoring\n", line);
1.22 otto 425: warn_on_invalid_line = false;
1.21 otto 426: }
1.18 otto 427: return NULL;
1.12 deraadt 428: }
429: if (using_plan_a)
430: return i_ptr[line];
1.1 deraadt 431: else {
1.12 deraadt 432: LINENUM offline = line % lines_per_buf;
433: LINENUM baseline = line - offline;
434:
435: if (tiline[0] == baseline)
436: whichbuf = 0;
437: else if (tiline[1] == baseline)
438: whichbuf = 1;
439: else {
440: tiline[whichbuf] = baseline;
1.16 otto 441:
1.12 deraadt 442: lseek(tifd, (off_t) (baseline / lines_per_buf *
1.16 otto 443: BUFFERSIZE), SEEK_SET);
444:
1.12 deraadt 445: if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
446: pfatal("error reading tmp file %s", TMPINNAME);
447: }
448: return tibuf[whichbuf] + (tireclen * offline);
1.1 deraadt 449: }
450: }
451:
1.12 deraadt 452: /*
453: * True if the string argument contains the revision number we want.
454: */
1.16 otto 455: static bool
1.19 otto 456: rev_in_string(const char *string)
1.1 deraadt 457: {
1.19 otto 458: const char *s;
459: int patlen;
1.1 deraadt 460:
1.16 otto 461: if (revision == NULL)
1.22 otto 462: return true;
1.12 deraadt 463: patlen = strlen(revision);
464: if (strnEQ(string, revision, patlen) && isspace(string[patlen]))
1.22 otto 465: return true;
1.12 deraadt 466: for (s = string; *s; s++) {
467: if (isspace(*s) && strnEQ(s + 1, revision, patlen) &&
468: isspace(s[patlen + 1])) {
1.22 otto 469: return true;
1.12 deraadt 470: }
1.1 deraadt 471: }
1.22 otto 472: return false;
1.1 deraadt 473: }
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