Annotation of src/usr.bin/patch/inp.c, Revision 1.34
1.34 ! otto 1: /* $OpenBSD: inp.c,v 1.33 2005/11/14 19:54:10 miod 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
1.34 ! otto 30: static const char rcsid[] = "$OpenBSD: inp.c,v 1.33 2005/11/14 19:54:10 miod 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];
1.20 deraadt 139: struct stat filestat;
1.23 otto 140: off_t i;
141: ptrdiff_t sz;
1.34 ! otto 142: size_t iline, lines_allocated;
1.23 otto 143:
144: #ifdef DEBUGGING
145: if (debug & 8)
146: return false;
147: #endif
1.1 deraadt 148:
1.19 otto 149: if (filename == NULL || *filename == '\0')
1.22 otto 150: return false;
1.8 millert 151:
1.1 deraadt 152: statfailed = stat(filename, &filestat);
1.12 deraadt 153: if (statfailed && ok_to_create_file) {
1.1 deraadt 154: if (verbose)
1.12 deraadt 155: say("(Creating file %s...)\n", filename);
156:
157: /*
158: * in check_patch case, we still display `Creating file' even
159: * though we're not. The rule is that -C should be as similar
160: * to normal patch behavior as possible
161: */
162: if (check_only)
1.22 otto 163: return true;
164: makedirs(filename, true);
1.12 deraadt 165: close(creat(filename, 0666));
166: statfailed = stat(filename, &filestat);
167: }
168: if (statfailed && check_only)
169: fatal("%s not found, -C mode, can't probe further\n", filename);
170: /* For nonexistent or read-only files, look for RCS or SCCS versions. */
171: if (statfailed ||
172: /* No one can write to it. */
173: (filestat.st_mode & 0222) == 0 ||
174: /* I can't write to it. */
1.19 otto 175: ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) {
1.16 otto 176: char *cs = NULL, *filebase, *filedir;
1.12 deraadt 177: struct stat cstat;
178:
179: filebase = basename(filename);
180: filedir = dirname(filename);
181:
182: /* Leave room in lbuf for the diff command. */
183: s = lbuf + 20;
184:
185: #define try(f, a1, a2, a3) \
186: (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0)
187:
188: if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
189: try("%s/RCS/%s%s", filedir, filebase, "") ||
190: try("%s/%s%s", filedir, filebase, RCSSUFFIX)) {
191: snprintf(buf, sizeof buf, CHECKOUT, filename);
192: snprintf(lbuf, sizeof lbuf, RCSDIFF, filename);
193: cs = "RCS";
194: } else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) ||
195: try("%s/%s%s", filedir, SCCSPREFIX, filebase)) {
196: snprintf(buf, sizeof buf, GET, s);
197: snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename);
198: cs = "SCCS";
199: } else if (statfailed)
200: fatal("can't find %s\n", filename);
201: /*
202: * else we can't write to it but it's not under a version
203: * control system, so just proceed.
204: */
205: if (cs) {
206: if (!statfailed) {
207: if ((filestat.st_mode & 0222) != 0)
208: /* The owner can write to it. */
209: fatal("file %s seems to be locked "
210: "by somebody else under %s\n",
211: filename, cs);
212: /*
213: * It might be checked out unlocked. See if
214: * it's safe to check out the default version
215: * locked.
216: */
217: if (verbose)
218: say("Comparing file %s to default "
219: "%s version...\n",
220: filename, cs);
221: if (system(lbuf))
222: fatal("can't check out file %s: "
223: "differs from default %s version\n",
224: filename, cs);
225: }
226: if (verbose)
227: say("Checking out file %s from %s...\n",
228: filename, cs);
229: if (system(buf) || stat(filename, &filestat))
230: fatal("can't check out file %s from %s\n",
231: filename, cs);
232: }
233: }
234: filemode = filestat.st_mode;
235: if (!S_ISREG(filemode))
236: fatal("%s is not a normal file--can't patch\n", filename);
237: i_size = filestat.st_size;
238: if (out_of_mem) {
239: set_hunkmax(); /* make sure dynamic arrays are allocated */
1.22 otto 240: out_of_mem = false;
241: return false; /* force plan b because plan a bombed */
1.12 deraadt 242: }
1.23 otto 243: if (i_size > SIZE_MAX) {
244: say("block too large to mmap\n");
1.24 deraadt 245: return false;
1.23 otto 246: }
1.12 deraadt 247: if ((ifd = open(filename, O_RDONLY)) < 0)
248: pfatal("can't open file %s", filename);
1.16 otto 249:
1.31 mickey 250: i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
1.23 otto 251: if (i_womp == MAP_FAILED) {
252: perror("mmap failed");
253: i_womp = NULL;
1.30 mickey 254: close(ifd);
1.23 otto 255: return false;
1.12 deraadt 256: }
1.16 otto 257:
1.12 deraadt 258: close(ifd);
1.30 mickey 259: if (i_size)
260: madvise(i_womp, i_size, MADV_SEQUENTIAL);
1.12 deraadt 261:
1.25 otto 262: /* estimate the number of lines */
263: lines_allocated = i_size / 25;
264: if (lines_allocated < 100)
265: lines_allocated = 100;
1.12 deraadt 266:
1.32 deraadt 267: if (!reallocate_lines(&lines_allocated))
1.24 deraadt 268: return false;
1.23 otto 269:
1.12 deraadt 270: /* now scan the buffer and build pointer array */
271: iline = 1;
272: i_ptr[iline] = i_womp;
1.23 otto 273: /* test for NUL too, to maintain the behavior of the original code */
274: for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
1.25 otto 275: if (*s == '\n') {
276: if (iline == lines_allocated) {
277: if (!reallocate_lines(&lines_allocated))
278: return false;
279: }
280: /* these are NOT NUL terminated */
281: i_ptr[++iline] = s + 1;
282: }
1.12 deraadt 283: }
1.23 otto 284: /* if the last line contains no EOL, append one */
285: if (i_size > 0 && i_womp[i_size - 1] != '\n') {
1.26 otto 286: last_line_missing_eol = true;
1.23 otto 287: /* fix last line */
288: sz = s - i_ptr[iline];
289: p = malloc(sz + 1);
290: if (p == NULL) {
291: free(i_ptr);
292: i_ptr = NULL;
293: munmap(i_womp, i_size);
294: i_womp = NULL;
295: return false;
296: }
1.24 deraadt 297:
1.23 otto 298: memcpy(p, i_ptr[iline], sz);
299: p[sz] = '\n';
300: i_ptr[iline] = p;
301: /* count the extra line and make it point to some valid mem */
302: i_ptr[++iline] = "";
1.26 otto 303: } else
304: last_line_missing_eol = false;
1.23 otto 305:
1.12 deraadt 306: input_lines = iline - 1;
1.11 deraadt 307:
1.12 deraadt 308: /* now check for revision, if any */
1.1 deraadt 309:
1.16 otto 310: if (revision != NULL) {
1.12 deraadt 311: if (!rev_in_string(i_womp)) {
312: if (force) {
313: if (verbose)
314: say("Warning: this file doesn't appear "
315: "to be the %s version--patching anyway.\n",
316: revision);
317: } else if (batch) {
318: fatal("this file doesn't appear to be the "
319: "%s version--aborting.\n",
320: revision);
321: } else {
322: ask("This file doesn't appear to be the "
323: "%s version--patch anyway? [n] ",
324: revision);
325: if (*buf != 'y')
326: fatal("aborted\n");
327: }
328: } else if (verbose)
329: say("Good. This file appears to be the %s version.\n",
330: revision);
331: }
1.22 otto 332: return true; /* plan a will work */
1.1 deraadt 333: }
334:
335: /* Keep (virtually) nothing in memory. */
336:
1.16 otto 337: static void
1.19 otto 338: plan_b(const char *filename)
1.1 deraadt 339: {
1.12 deraadt 340: FILE *ifp;
1.34 ! otto 341: size_t i = 0, j, maxlen = 1;
1.27 otto 342: char *p;
1.16 otto 343: bool found_revision = (revision == NULL);
1.12 deraadt 344:
1.22 otto 345: using_plan_a = false;
1.16 otto 346: if ((ifp = fopen(filename, "r")) == NULL)
1.12 deraadt 347: pfatal("can't open file %s", filename);
348: (void) unlink(TMPINNAME);
349: if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
350: pfatal("can't open file %s", TMPINNAME);
1.16 otto 351: while (fgets(buf, sizeof buf, ifp) != NULL) {
352: if (revision != NULL && !found_revision && rev_in_string(buf))
1.22 otto 353: found_revision = true;
1.12 deraadt 354: if ((i = strlen(buf)) > maxlen)
355: maxlen = i; /* find longest line */
356: }
1.27 otto 357: last_line_missing_eol = i > 0 && buf[i - 1] != '\n';
358: if (last_line_missing_eol && maxlen == i)
359: maxlen++;
1.32 deraadt 360:
1.16 otto 361: if (revision != NULL) {
1.12 deraadt 362: if (!found_revision) {
363: if (force) {
364: if (verbose)
365: say("Warning: this file doesn't appear "
366: "to be the %s version--patching anyway.\n",
367: revision);
368: } else if (batch) {
369: fatal("this file doesn't appear to be the "
370: "%s version--aborting.\n",
371: revision);
372: } else {
373: ask("This file doesn't appear to be the %s "
374: "version--patch anyway? [n] ",
375: revision);
376: if (*buf != 'y')
377: fatal("aborted\n");
378: }
379: } else if (verbose)
380: say("Good. This file appears to be the %s version.\n",
381: revision);
382: }
1.16 otto 383: fseek(ifp, 0L, SEEK_SET); /* rewind file */
1.12 deraadt 384: lines_per_buf = BUFFERSIZE / maxlen;
385: tireclen = maxlen;
1.13 deraadt 386: tibuf[0] = malloc(BUFFERSIZE + 1);
1.16 otto 387: if (tibuf[0] == NULL)
1.12 deraadt 388: fatal("out of memory\n");
1.13 deraadt 389: tibuf[1] = malloc(BUFFERSIZE + 1);
1.16 otto 390: if (tibuf[1] == NULL)
1.12 deraadt 391: fatal("out of memory\n");
392: for (i = 1;; i++) {
1.27 otto 393: p = tibuf[0] + maxlen * (i % lines_per_buf);
394: if (i % lines_per_buf == 0) /* new block */
1.12 deraadt 395: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
396: pfatal("can't write temp file");
1.27 otto 397: if (fgets(p, maxlen + 1, ifp) == NULL) {
1.12 deraadt 398: input_lines = i - 1;
1.27 otto 399: if (i % lines_per_buf != 0)
1.12 deraadt 400: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
401: pfatal("can't write temp file");
402: break;
403: }
1.27 otto 404: j = strlen(p);
405: /* These are '\n' terminated strings, so no need to add a NUL */
406: if (j == 0 || p[j - 1] != '\n')
407: p[j] = '\n';
1.12 deraadt 408: }
409: fclose(ifp);
410: close(tifd);
411: if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
412: pfatal("can't reopen file %s", TMPINNAME);
1.1 deraadt 413: }
414:
1.12 deraadt 415: /*
416: * Fetch a line from the input file, \n terminated, not necessarily \0.
417: */
1.1 deraadt 418: char *
1.12 deraadt 419: ifetch(LINENUM line, int whichbuf)
1.1 deraadt 420: {
1.12 deraadt 421: if (line < 1 || line > input_lines) {
1.21 otto 422: if (warn_on_invalid_line) {
423: say("No such line %ld in input file, ignoring\n", line);
1.22 otto 424: warn_on_invalid_line = false;
1.21 otto 425: }
1.18 otto 426: return NULL;
1.12 deraadt 427: }
428: if (using_plan_a)
429: return i_ptr[line];
1.1 deraadt 430: else {
1.12 deraadt 431: LINENUM offline = line % lines_per_buf;
432: LINENUM baseline = line - offline;
433:
434: if (tiline[0] == baseline)
435: whichbuf = 0;
436: else if (tiline[1] == baseline)
437: whichbuf = 1;
438: else {
439: tiline[whichbuf] = baseline;
1.16 otto 440:
1.34 ! otto 441: if (lseek(tifd, (off_t) (baseline / lines_per_buf *
! 442: BUFFERSIZE), SEEK_SET) < 0)
! 443: pfatal("cannot seek in the temporary input file");
1.16 otto 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;
1.34 ! otto 459: size_t 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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