Annotation of src/usr.bin/patch/inp.c, Revision 1.46
1.46 ! deraadt 1: /* $OpenBSD: inp.c,v 1.45 2015/11/11 01:12:10 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>
1.23 otto 36: #include <stddef.h>
1.43 millert 37: #include <stdint.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;
1.44 millert 135: char *p, *s;
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) {
1.46 ! deraadt 151: int fd;
! 152:
1.1 deraadt 153: if (verbose)
1.12 deraadt 154: say("(Creating file %s...)\n", filename);
155:
156: /*
157: * in check_patch case, we still display `Creating file' even
158: * though we're not. The rule is that -C should be as similar
159: * to normal patch behavior as possible
160: */
161: if (check_only)
1.22 otto 162: return true;
163: makedirs(filename, true);
1.46 ! deraadt 164: if ((fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0666)) != -1)
! 165: close(fd);
! 166:
1.12 deraadt 167: statfailed = stat(filename, &filestat);
168: }
1.44 millert 169: if (statfailed)
170: fatal("can't find %s\n", filename);
1.12 deraadt 171: filemode = filestat.st_mode;
172: if (!S_ISREG(filemode))
173: fatal("%s is not a normal file--can't patch\n", filename);
174: i_size = filestat.st_size;
175: if (out_of_mem) {
176: set_hunkmax(); /* make sure dynamic arrays are allocated */
1.22 otto 177: out_of_mem = false;
178: return false; /* force plan b because plan a bombed */
1.12 deraadt 179: }
1.23 otto 180: if (i_size > SIZE_MAX) {
181: say("block too large to mmap\n");
1.24 deraadt 182: return false;
1.23 otto 183: }
1.12 deraadt 184: if ((ifd = open(filename, O_RDONLY)) < 0)
185: pfatal("can't open file %s", filename);
1.16 otto 186:
1.36 ajacouto 187: if (i_size) {
188: i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
189: if (i_womp == MAP_FAILED) {
190: perror("mmap failed");
191: i_womp = NULL;
192: close(ifd);
193: return false;
194: }
195: } else {
1.23 otto 196: i_womp = NULL;
1.12 deraadt 197: }
1.16 otto 198:
1.12 deraadt 199: close(ifd);
1.30 mickey 200: if (i_size)
201: madvise(i_womp, i_size, MADV_SEQUENTIAL);
1.12 deraadt 202:
1.25 otto 203: /* estimate the number of lines */
204: lines_allocated = i_size / 25;
205: if (lines_allocated < 100)
206: lines_allocated = 100;
1.12 deraadt 207:
1.32 deraadt 208: if (!reallocate_lines(&lines_allocated))
1.24 deraadt 209: return false;
1.23 otto 210:
1.12 deraadt 211: /* now scan the buffer and build pointer array */
212: iline = 1;
213: i_ptr[iline] = i_womp;
1.23 otto 214: /* test for NUL too, to maintain the behavior of the original code */
215: for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
1.25 otto 216: if (*s == '\n') {
217: if (iline == lines_allocated) {
218: if (!reallocate_lines(&lines_allocated))
219: return false;
220: }
221: /* these are NOT NUL terminated */
222: i_ptr[++iline] = s + 1;
223: }
1.12 deraadt 224: }
1.23 otto 225: /* if the last line contains no EOL, append one */
226: if (i_size > 0 && i_womp[i_size - 1] != '\n') {
1.26 otto 227: last_line_missing_eol = true;
1.23 otto 228: /* fix last line */
229: sz = s - i_ptr[iline];
230: p = malloc(sz + 1);
231: if (p == NULL) {
232: free(i_ptr);
233: i_ptr = NULL;
234: munmap(i_womp, i_size);
235: i_womp = NULL;
236: return false;
237: }
1.24 deraadt 238:
1.23 otto 239: memcpy(p, i_ptr[iline], sz);
240: p[sz] = '\n';
241: i_ptr[iline] = p;
242: /* count the extra line and make it point to some valid mem */
243: i_ptr[++iline] = "";
1.26 otto 244: } else
245: last_line_missing_eol = false;
1.23 otto 246:
1.12 deraadt 247: input_lines = iline - 1;
1.11 deraadt 248:
1.12 deraadt 249: /* now check for revision, if any */
1.1 deraadt 250:
1.16 otto 251: if (revision != NULL) {
1.41 tobias 252: if (i_womp == NULL || !rev_in_string(i_womp)) {
1.12 deraadt 253: if (force) {
254: if (verbose)
255: say("Warning: this file doesn't appear "
256: "to be the %s version--patching anyway.\n",
257: revision);
258: } else if (batch) {
259: fatal("this file doesn't appear to be the "
260: "%s version--aborting.\n",
261: revision);
262: } else {
263: ask("This file doesn't appear to be the "
264: "%s version--patch anyway? [n] ",
265: revision);
266: if (*buf != 'y')
267: fatal("aborted\n");
268: }
269: } else if (verbose)
270: say("Good. This file appears to be the %s version.\n",
271: revision);
272: }
1.22 otto 273: return true; /* plan a will work */
1.1 deraadt 274: }
275:
276: /* Keep (virtually) nothing in memory. */
277:
1.16 otto 278: static void
1.19 otto 279: plan_b(const char *filename)
1.1 deraadt 280: {
1.12 deraadt 281: FILE *ifp;
1.42 tobias 282: size_t i = 0, j, len, maxlen = 1;
283: char *lbuf = NULL, *p;
1.16 otto 284: bool found_revision = (revision == NULL);
1.12 deraadt 285:
1.22 otto 286: using_plan_a = false;
1.16 otto 287: if ((ifp = fopen(filename, "r")) == NULL)
1.12 deraadt 288: pfatal("can't open file %s", filename);
289: (void) unlink(TMPINNAME);
290: if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
291: pfatal("can't open file %s", TMPINNAME);
1.42 tobias 292: while ((p = fgetln(ifp, &len)) != NULL) {
293: if (p[len - 1] == '\n')
294: p[len - 1] = '\0';
295: else {
296: /* EOF without EOL, copy and add the NUL */
297: if ((lbuf = malloc(len + 1)) == NULL)
298: fatal("out of memory\n");
299: memcpy(lbuf, p, len);
300: lbuf[len] = '\0';
301: p = lbuf;
302:
303: last_line_missing_eol = true;
304: len++;
305: }
306: if (revision != NULL && !found_revision && rev_in_string(p))
1.22 otto 307: found_revision = true;
1.42 tobias 308: if (len > maxlen)
309: maxlen = len; /* find longest line */
1.12 deraadt 310: }
1.42 tobias 311: free(lbuf);
312: if (ferror(ifp))
313: pfatal("can't read file %s", filename);
1.32 deraadt 314:
1.16 otto 315: if (revision != NULL) {
1.12 deraadt 316: if (!found_revision) {
317: if (force) {
318: if (verbose)
319: say("Warning: this file doesn't appear "
320: "to be the %s version--patching anyway.\n",
321: revision);
322: } else if (batch) {
323: fatal("this file doesn't appear to be the "
324: "%s version--aborting.\n",
325: revision);
326: } else {
327: ask("This file doesn't appear to be the %s "
328: "version--patch anyway? [n] ",
329: revision);
330: if (*buf != 'y')
331: fatal("aborted\n");
332: }
333: } else if (verbose)
334: say("Good. This file appears to be the %s version.\n",
335: revision);
336: }
1.16 otto 337: fseek(ifp, 0L, SEEK_SET); /* rewind file */
1.12 deraadt 338: tireclen = maxlen;
1.42 tobias 339: tibuflen = maxlen > BUFFERSIZE ? maxlen : BUFFERSIZE;
340: lines_per_buf = tibuflen / maxlen;
341: tibuf[0] = malloc(tibuflen + 1);
1.16 otto 342: if (tibuf[0] == NULL)
1.12 deraadt 343: fatal("out of memory\n");
1.42 tobias 344: tibuf[1] = malloc(tibuflen + 1);
1.16 otto 345: if (tibuf[1] == NULL)
1.12 deraadt 346: fatal("out of memory\n");
347: for (i = 1;; i++) {
1.27 otto 348: p = tibuf[0] + maxlen * (i % lines_per_buf);
349: if (i % lines_per_buf == 0) /* new block */
1.42 tobias 350: if (write(tifd, tibuf[0], tibuflen) !=
351: (ssize_t) tibuflen)
1.12 deraadt 352: pfatal("can't write temp file");
1.27 otto 353: if (fgets(p, maxlen + 1, ifp) == NULL) {
1.12 deraadt 354: input_lines = i - 1;
1.27 otto 355: if (i % lines_per_buf != 0)
1.42 tobias 356: if (write(tifd, tibuf[0], tibuflen) !=
357: (ssize_t) tibuflen)
1.12 deraadt 358: pfatal("can't write temp file");
359: break;
360: }
1.27 otto 361: j = strlen(p);
362: /* These are '\n' terminated strings, so no need to add a NUL */
363: if (j == 0 || p[j - 1] != '\n')
364: p[j] = '\n';
1.12 deraadt 365: }
366: fclose(ifp);
367: close(tifd);
368: if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
369: pfatal("can't reopen file %s", TMPINNAME);
1.1 deraadt 370: }
371:
1.12 deraadt 372: /*
373: * Fetch a line from the input file, \n terminated, not necessarily \0.
374: */
1.1 deraadt 375: char *
1.12 deraadt 376: ifetch(LINENUM line, int whichbuf)
1.1 deraadt 377: {
1.12 deraadt 378: if (line < 1 || line > input_lines) {
1.21 otto 379: if (warn_on_invalid_line) {
380: say("No such line %ld in input file, ignoring\n", line);
1.22 otto 381: warn_on_invalid_line = false;
1.21 otto 382: }
1.18 otto 383: return NULL;
1.12 deraadt 384: }
385: if (using_plan_a)
386: return i_ptr[line];
1.1 deraadt 387: else {
1.12 deraadt 388: LINENUM offline = line % lines_per_buf;
389: LINENUM baseline = line - offline;
390:
391: if (tiline[0] == baseline)
392: whichbuf = 0;
393: else if (tiline[1] == baseline)
394: whichbuf = 1;
395: else {
396: tiline[whichbuf] = baseline;
1.16 otto 397:
1.34 otto 398: if (lseek(tifd, (off_t) (baseline / lines_per_buf *
1.42 tobias 399: tibuflen), SEEK_SET) < 0)
1.34 otto 400: pfatal("cannot seek in the temporary input file");
1.16 otto 401:
1.42 tobias 402: if (read(tifd, tibuf[whichbuf], tibuflen)
403: != (ssize_t) tibuflen)
1.12 deraadt 404: pfatal("error reading tmp file %s", TMPINNAME);
405: }
406: return tibuf[whichbuf] + (tireclen * offline);
1.1 deraadt 407: }
408: }
409:
1.12 deraadt 410: /*
411: * True if the string argument contains the revision number we want.
412: */
1.16 otto 413: static bool
1.19 otto 414: rev_in_string(const char *string)
1.1 deraadt 415: {
1.19 otto 416: const char *s;
1.34 otto 417: size_t patlen;
1.1 deraadt 418:
1.16 otto 419: if (revision == NULL)
1.22 otto 420: return true;
1.12 deraadt 421: patlen = strlen(revision);
1.37 deraadt 422: if (strnEQ(string, revision, patlen) &&
423: isspace((unsigned char)string[patlen]))
1.22 otto 424: return true;
1.12 deraadt 425: for (s = string; *s; s++) {
1.37 deraadt 426: if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
427: isspace((unsigned char)s[patlen + 1])) {
1.22 otto 428: return true;
1.12 deraadt 429: }
1.1 deraadt 430: }
1.22 otto 431: return false;
1.1 deraadt 432: }
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