Annotation of src/usr.bin/patch/inp.c, Revision 1.37.6.1
1.37.6.1! guenther 1: /* $OpenBSD: inp.c,v 1.37 2013/11/26 13:19:07 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: */
1.1 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) {
75: i_size = 0;
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: }
1.12 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;
114: p = realloc(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;
1.37.6.1! guenther 134: char *p, *s;
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: }
1.37.6.1! guenther 164: if (statfailed)
! 165: fatal("can't find %s\n", filename);
1.12 deraadt 166: filemode = filestat.st_mode;
167: if (!S_ISREG(filemode))
168: fatal("%s is not a normal file--can't patch\n", filename);
169: i_size = filestat.st_size;
170: if (out_of_mem) {
171: set_hunkmax(); /* make sure dynamic arrays are allocated */
1.22 otto 172: out_of_mem = false;
173: return false; /* force plan b because plan a bombed */
1.12 deraadt 174: }
1.23 otto 175: if (i_size > SIZE_MAX) {
176: say("block too large to mmap\n");
1.24 deraadt 177: return false;
1.23 otto 178: }
1.12 deraadt 179: if ((ifd = open(filename, O_RDONLY)) < 0)
180: pfatal("can't open file %s", filename);
1.16 otto 181:
1.36 ajacouto 182: if (i_size) {
183: i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
184: if (i_womp == MAP_FAILED) {
185: perror("mmap failed");
186: i_womp = NULL;
187: close(ifd);
188: return false;
189: }
190: } else {
1.23 otto 191: i_womp = NULL;
1.12 deraadt 192: }
1.16 otto 193:
1.12 deraadt 194: close(ifd);
1.30 mickey 195: if (i_size)
196: madvise(i_womp, i_size, MADV_SEQUENTIAL);
1.12 deraadt 197:
1.25 otto 198: /* estimate the number of lines */
199: lines_allocated = i_size / 25;
200: if (lines_allocated < 100)
201: lines_allocated = 100;
1.12 deraadt 202:
1.32 deraadt 203: if (!reallocate_lines(&lines_allocated))
1.24 deraadt 204: return false;
1.23 otto 205:
1.12 deraadt 206: /* now scan the buffer and build pointer array */
207: iline = 1;
208: i_ptr[iline] = i_womp;
1.23 otto 209: /* test for NUL too, to maintain the behavior of the original code */
210: for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
1.25 otto 211: if (*s == '\n') {
212: if (iline == lines_allocated) {
213: if (!reallocate_lines(&lines_allocated))
214: return false;
215: }
216: /* these are NOT NUL terminated */
217: i_ptr[++iline] = s + 1;
218: }
1.12 deraadt 219: }
1.23 otto 220: /* if the last line contains no EOL, append one */
221: if (i_size > 0 && i_womp[i_size - 1] != '\n') {
1.26 otto 222: last_line_missing_eol = true;
1.23 otto 223: /* fix last line */
224: sz = s - i_ptr[iline];
225: p = malloc(sz + 1);
226: if (p == NULL) {
227: free(i_ptr);
228: i_ptr = NULL;
229: munmap(i_womp, i_size);
230: i_womp = NULL;
231: return false;
232: }
1.24 deraadt 233:
1.23 otto 234: memcpy(p, i_ptr[iline], sz);
235: p[sz] = '\n';
236: i_ptr[iline] = p;
237: /* count the extra line and make it point to some valid mem */
238: i_ptr[++iline] = "";
1.26 otto 239: } else
240: last_line_missing_eol = false;
1.23 otto 241:
1.12 deraadt 242: input_lines = iline - 1;
1.11 deraadt 243:
1.12 deraadt 244: /* now check for revision, if any */
1.1 deraadt 245:
1.16 otto 246: if (revision != NULL) {
1.12 deraadt 247: if (!rev_in_string(i_womp)) {
248: if (force) {
249: if (verbose)
250: say("Warning: this file doesn't appear "
251: "to be the %s version--patching anyway.\n",
252: revision);
253: } else if (batch) {
254: fatal("this file doesn't appear to be the "
255: "%s version--aborting.\n",
256: revision);
257: } else {
258: ask("This file doesn't appear to be the "
259: "%s version--patch anyway? [n] ",
260: revision);
261: if (*buf != 'y')
262: fatal("aborted\n");
263: }
264: } else if (verbose)
265: say("Good. This file appears to be the %s version.\n",
266: revision);
267: }
1.22 otto 268: return true; /* plan a will work */
1.1 deraadt 269: }
270:
271: /* Keep (virtually) nothing in memory. */
272:
1.16 otto 273: static void
1.19 otto 274: plan_b(const char *filename)
1.1 deraadt 275: {
1.12 deraadt 276: FILE *ifp;
1.34 otto 277: size_t i = 0, j, maxlen = 1;
1.27 otto 278: char *p;
1.16 otto 279: bool found_revision = (revision == NULL);
1.12 deraadt 280:
1.22 otto 281: using_plan_a = false;
1.16 otto 282: if ((ifp = fopen(filename, "r")) == NULL)
1.12 deraadt 283: pfatal("can't open file %s", filename);
284: (void) unlink(TMPINNAME);
285: if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
286: pfatal("can't open file %s", TMPINNAME);
1.16 otto 287: while (fgets(buf, sizeof buf, ifp) != NULL) {
288: if (revision != NULL && !found_revision && rev_in_string(buf))
1.22 otto 289: found_revision = true;
1.12 deraadt 290: if ((i = strlen(buf)) > maxlen)
291: maxlen = i; /* find longest line */
292: }
1.27 otto 293: last_line_missing_eol = i > 0 && buf[i - 1] != '\n';
294: if (last_line_missing_eol && maxlen == i)
295: maxlen++;
1.32 deraadt 296:
1.16 otto 297: if (revision != NULL) {
1.12 deraadt 298: if (!found_revision) {
299: if (force) {
300: if (verbose)
301: say("Warning: this file doesn't appear "
302: "to be the %s version--patching anyway.\n",
303: revision);
304: } else if (batch) {
305: fatal("this file doesn't appear to be the "
306: "%s version--aborting.\n",
307: revision);
308: } else {
309: ask("This file doesn't appear to be the %s "
310: "version--patch anyway? [n] ",
311: revision);
312: if (*buf != 'y')
313: fatal("aborted\n");
314: }
315: } else if (verbose)
316: say("Good. This file appears to be the %s version.\n",
317: revision);
318: }
1.16 otto 319: fseek(ifp, 0L, SEEK_SET); /* rewind file */
1.12 deraadt 320: lines_per_buf = BUFFERSIZE / maxlen;
321: tireclen = maxlen;
1.13 deraadt 322: tibuf[0] = malloc(BUFFERSIZE + 1);
1.16 otto 323: if (tibuf[0] == NULL)
1.12 deraadt 324: fatal("out of memory\n");
1.13 deraadt 325: tibuf[1] = malloc(BUFFERSIZE + 1);
1.16 otto 326: if (tibuf[1] == NULL)
1.12 deraadt 327: fatal("out of memory\n");
328: for (i = 1;; i++) {
1.27 otto 329: p = tibuf[0] + maxlen * (i % lines_per_buf);
330: if (i % lines_per_buf == 0) /* new block */
1.12 deraadt 331: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
332: pfatal("can't write temp file");
1.27 otto 333: if (fgets(p, maxlen + 1, ifp) == NULL) {
1.12 deraadt 334: input_lines = i - 1;
1.27 otto 335: if (i % lines_per_buf != 0)
1.12 deraadt 336: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
337: pfatal("can't write temp file");
338: break;
339: }
1.27 otto 340: j = strlen(p);
341: /* These are '\n' terminated strings, so no need to add a NUL */
342: if (j == 0 || p[j - 1] != '\n')
343: p[j] = '\n';
1.12 deraadt 344: }
345: fclose(ifp);
346: close(tifd);
347: if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
348: pfatal("can't reopen file %s", TMPINNAME);
1.1 deraadt 349: }
350:
1.12 deraadt 351: /*
352: * Fetch a line from the input file, \n terminated, not necessarily \0.
353: */
1.1 deraadt 354: char *
1.12 deraadt 355: ifetch(LINENUM line, int whichbuf)
1.1 deraadt 356: {
1.12 deraadt 357: if (line < 1 || line > input_lines) {
1.21 otto 358: if (warn_on_invalid_line) {
359: say("No such line %ld in input file, ignoring\n", line);
1.22 otto 360: warn_on_invalid_line = false;
1.21 otto 361: }
1.18 otto 362: return NULL;
1.12 deraadt 363: }
364: if (using_plan_a)
365: return i_ptr[line];
1.1 deraadt 366: else {
1.12 deraadt 367: LINENUM offline = line % lines_per_buf;
368: LINENUM baseline = line - offline;
369:
370: if (tiline[0] == baseline)
371: whichbuf = 0;
372: else if (tiline[1] == baseline)
373: whichbuf = 1;
374: else {
375: tiline[whichbuf] = baseline;
1.16 otto 376:
1.34 otto 377: if (lseek(tifd, (off_t) (baseline / lines_per_buf *
378: BUFFERSIZE), SEEK_SET) < 0)
379: pfatal("cannot seek in the temporary input file");
1.16 otto 380:
1.12 deraadt 381: if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
382: pfatal("error reading tmp file %s", TMPINNAME);
383: }
384: return tibuf[whichbuf] + (tireclen * offline);
1.1 deraadt 385: }
386: }
387:
1.12 deraadt 388: /*
389: * True if the string argument contains the revision number we want.
390: */
1.16 otto 391: static bool
1.19 otto 392: rev_in_string(const char *string)
1.1 deraadt 393: {
1.19 otto 394: const char *s;
1.34 otto 395: size_t patlen;
1.1 deraadt 396:
1.16 otto 397: if (revision == NULL)
1.22 otto 398: return true;
1.12 deraadt 399: patlen = strlen(revision);
1.37 deraadt 400: if (strnEQ(string, revision, patlen) &&
401: isspace((unsigned char)string[patlen]))
1.22 otto 402: return true;
1.12 deraadt 403: for (s = string; *s; s++) {
1.37 deraadt 404: if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
405: isspace((unsigned char)s[patlen + 1])) {
1.22 otto 406: return true;
1.12 deraadt 407: }
1.1 deraadt 408: }
1.22 otto 409: return false;
1.1 deraadt 410: }
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