Annotation of src/usr.bin/patch/inp.c, Revision 1.49
1.49 ! deraadt 1: /* $OpenBSD: inp.c,v 1.48 2018/04/26 12:42:51 guenther 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/stat.h>
1.23 otto 30: #include <sys/mman.h>
1.16 otto 31:
32: #include <ctype.h>
1.48 guenther 33: #include <fcntl.h>
1.23 otto 34: #include <stddef.h>
1.43 millert 35: #include <stdint.h>
1.19 otto 36: #include <stdio.h>
1.16 otto 37: #include <stdlib.h>
38: #include <string.h>
39: #include <unistd.h>
40:
1.1 deraadt 41: #include "common.h"
42: #include "util.h"
43: #include "pch.h"
44: #include "inp.h"
45:
1.7 espie 46:
1.1 deraadt 47: /* Input-file-with-indexable-lines abstract type */
48:
1.12 deraadt 49: static off_t i_size; /* size of the input file */
50: static char *i_womp; /* plan a buffer for entire file */
51: static char **i_ptr; /* pointers to lines in i_womp */
52:
53: static int tifd = -1; /* plan b virtual string array */
54: static char *tibuf[2]; /* plan b buffers */
55: static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
1.42 tobias 56: static size_t lines_per_buf; /* how many lines per buffer */
57: static size_t tibuflen; /* plan b buffer length */
58: static size_t tireclen; /* length of records in tmp file */
1.1 deraadt 59:
1.19 otto 60: static bool rev_in_string(const char *);
1.25 otto 61: static bool reallocate_lines(size_t *);
1.19 otto 62:
63: /* returns false if insufficient memory */
64: static bool plan_a(const char *);
65:
66: static void plan_b(const char *);
1.11 deraadt 67:
1.1 deraadt 68: /* New patch--prepare to edit another file. */
69:
70: void
1.11 deraadt 71: re_input(void)
1.1 deraadt 72: {
1.12 deraadt 73: if (using_plan_a) {
1.16 otto 74: free(i_ptr);
75: i_ptr = NULL;
1.23 otto 76: if (i_womp != NULL) {
77: munmap(i_womp, i_size);
78: i_womp = NULL;
79: }
1.39 tobias 80: i_size = 0;
1.12 deraadt 81: } else {
1.22 otto 82: using_plan_a = true; /* maybe the next one is smaller */
1.12 deraadt 83: close(tifd);
84: tifd = -1;
85: free(tibuf[0]);
86: free(tibuf[1]);
1.16 otto 87: tibuf[0] = tibuf[1] = NULL;
1.12 deraadt 88: tiline[0] = tiline[1] = -1;
89: tireclen = 0;
90: }
1.1 deraadt 91: }
92:
1.33 miod 93: /* Construct the line index, somehow or other. */
1.1 deraadt 94:
95: void
1.19 otto 96: scan_input(const char *filename)
1.1 deraadt 97: {
1.12 deraadt 98: if (!plan_a(filename))
99: plan_b(filename);
100: if (verbose) {
101: say("Patching file %s using Plan %s...\n", filename,
102: (using_plan_a ? "A" : "B"));
103: }
1.1 deraadt 104: }
105:
1.25 otto 106: static bool
1.47 deraadt 107: reallocate_lines(size_t *lines_allocatedp)
1.25 otto 108: {
1.29 otto 109: char **p;
110: size_t new_size;
1.25 otto 111:
1.47 deraadt 112: new_size = *lines_allocatedp * 3 / 2;
1.38 doug 113: p = reallocarray(i_ptr, new_size + 2, sizeof(char *));
1.25 otto 114: if (p == NULL) { /* shucks, it was a near thing */
115: munmap(i_womp, i_size);
116: i_womp = NULL;
117: free(i_ptr);
118: i_ptr = NULL;
1.47 deraadt 119: *lines_allocatedp = 0;
1.25 otto 120: return false;
121: }
1.47 deraadt 122: *lines_allocatedp = new_size;
1.25 otto 123: i_ptr = p;
124: return true;
125: }
126:
1.1 deraadt 127: /* Try keeping everything in memory. */
128:
1.16 otto 129: static bool
1.19 otto 130: plan_a(const char *filename)
1.1 deraadt 131: {
1.19 otto 132: int ifd, statfailed;
1.44 millert 133: char *p, *s;
1.20 deraadt 134: struct stat filestat;
1.23 otto 135: off_t i;
136: ptrdiff_t sz;
1.34 otto 137: size_t iline, lines_allocated;
1.23 otto 138:
139: #ifdef DEBUGGING
140: if (debug & 8)
141: return false;
142: #endif
1.1 deraadt 143:
1.19 otto 144: if (filename == NULL || *filename == '\0')
1.22 otto 145: return false;
1.8 millert 146:
1.1 deraadt 147: statfailed = stat(filename, &filestat);
1.12 deraadt 148: if (statfailed && ok_to_create_file) {
1.46 deraadt 149: int fd;
150:
1.1 deraadt 151: if (verbose)
1.12 deraadt 152: say("(Creating file %s...)\n", filename);
153:
154: /*
155: * in check_patch case, we still display `Creating file' even
156: * though we're not. The rule is that -C should be as similar
157: * to normal patch behavior as possible
158: */
159: if (check_only)
1.22 otto 160: return true;
161: makedirs(filename, true);
1.46 deraadt 162: if ((fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0666)) != -1)
163: close(fd);
164:
1.12 deraadt 165: statfailed = stat(filename, &filestat);
166: }
1.44 millert 167: if (statfailed)
168: fatal("can't find %s\n", filename);
1.12 deraadt 169: filemode = filestat.st_mode;
170: if (!S_ISREG(filemode))
171: fatal("%s is not a normal file--can't patch\n", filename);
172: i_size = filestat.st_size;
173: if (out_of_mem) {
174: set_hunkmax(); /* make sure dynamic arrays are allocated */
1.22 otto 175: out_of_mem = false;
176: return false; /* force plan b because plan a bombed */
1.12 deraadt 177: }
1.23 otto 178: if (i_size > SIZE_MAX) {
179: say("block too large to mmap\n");
1.24 deraadt 180: return false;
1.23 otto 181: }
1.49 ! deraadt 182: if ((ifd = open(filename, O_RDONLY)) == -1)
1.12 deraadt 183: pfatal("can't open file %s", filename);
1.16 otto 184:
1.36 ajacouto 185: if (i_size) {
186: i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
187: if (i_womp == MAP_FAILED) {
188: perror("mmap failed");
189: i_womp = NULL;
190: close(ifd);
191: return false;
192: }
193: } else {
1.23 otto 194: i_womp = NULL;
1.12 deraadt 195: }
1.16 otto 196:
1.12 deraadt 197: close(ifd);
1.30 mickey 198: if (i_size)
199: madvise(i_womp, i_size, MADV_SEQUENTIAL);
1.12 deraadt 200:
1.25 otto 201: /* estimate the number of lines */
202: lines_allocated = i_size / 25;
203: if (lines_allocated < 100)
204: lines_allocated = 100;
1.12 deraadt 205:
1.32 deraadt 206: if (!reallocate_lines(&lines_allocated))
1.24 deraadt 207: return false;
1.23 otto 208:
1.12 deraadt 209: /* now scan the buffer and build pointer array */
210: iline = 1;
211: i_ptr[iline] = i_womp;
1.23 otto 212: /* test for NUL too, to maintain the behavior of the original code */
213: for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
1.25 otto 214: if (*s == '\n') {
215: if (iline == lines_allocated) {
216: if (!reallocate_lines(&lines_allocated))
217: return false;
218: }
219: /* these are NOT NUL terminated */
220: i_ptr[++iline] = s + 1;
221: }
1.12 deraadt 222: }
1.23 otto 223: /* if the last line contains no EOL, append one */
224: if (i_size > 0 && i_womp[i_size - 1] != '\n') {
1.26 otto 225: last_line_missing_eol = true;
1.23 otto 226: /* fix last line */
227: sz = s - i_ptr[iline];
228: p = malloc(sz + 1);
229: if (p == NULL) {
230: free(i_ptr);
231: i_ptr = NULL;
232: munmap(i_womp, i_size);
233: i_womp = NULL;
234: return false;
235: }
1.24 deraadt 236:
1.23 otto 237: memcpy(p, i_ptr[iline], sz);
238: p[sz] = '\n';
239: i_ptr[iline] = p;
240: /* count the extra line and make it point to some valid mem */
241: i_ptr[++iline] = "";
1.26 otto 242: } else
243: last_line_missing_eol = false;
1.23 otto 244:
1.12 deraadt 245: input_lines = iline - 1;
1.11 deraadt 246:
1.12 deraadt 247: /* now check for revision, if any */
1.1 deraadt 248:
1.16 otto 249: if (revision != NULL) {
1.41 tobias 250: if (i_womp == NULL || !rev_in_string(i_womp)) {
1.12 deraadt 251: if (force) {
252: if (verbose)
253: say("Warning: this file doesn't appear "
254: "to be the %s version--patching anyway.\n",
255: revision);
256: } else if (batch) {
257: fatal("this file doesn't appear to be the "
258: "%s version--aborting.\n",
259: revision);
260: } else {
261: ask("This file doesn't appear to be the "
262: "%s version--patch anyway? [n] ",
263: revision);
264: if (*buf != 'y')
265: fatal("aborted\n");
266: }
267: } else if (verbose)
268: say("Good. This file appears to be the %s version.\n",
269: revision);
270: }
1.22 otto 271: return true; /* plan a will work */
1.1 deraadt 272: }
273:
274: /* Keep (virtually) nothing in memory. */
275:
1.16 otto 276: static void
1.19 otto 277: plan_b(const char *filename)
1.1 deraadt 278: {
1.12 deraadt 279: FILE *ifp;
1.42 tobias 280: size_t i = 0, j, len, maxlen = 1;
281: char *lbuf = NULL, *p;
1.16 otto 282: bool found_revision = (revision == NULL);
1.12 deraadt 283:
1.22 otto 284: using_plan_a = false;
1.16 otto 285: if ((ifp = fopen(filename, "r")) == NULL)
1.12 deraadt 286: pfatal("can't open file %s", filename);
287: (void) unlink(TMPINNAME);
1.49 ! deraadt 288: if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) == -1)
1.12 deraadt 289: pfatal("can't open file %s", TMPINNAME);
1.42 tobias 290: while ((p = fgetln(ifp, &len)) != NULL) {
291: if (p[len - 1] == '\n')
292: p[len - 1] = '\0';
293: else {
294: /* EOF without EOL, copy and add the NUL */
295: if ((lbuf = malloc(len + 1)) == NULL)
296: fatal("out of memory\n");
297: memcpy(lbuf, p, len);
298: lbuf[len] = '\0';
299: p = lbuf;
300:
301: last_line_missing_eol = true;
302: len++;
303: }
304: if (revision != NULL && !found_revision && rev_in_string(p))
1.22 otto 305: found_revision = true;
1.42 tobias 306: if (len > maxlen)
307: maxlen = len; /* find longest line */
1.12 deraadt 308: }
1.42 tobias 309: free(lbuf);
310: if (ferror(ifp))
311: pfatal("can't read file %s", filename);
1.32 deraadt 312:
1.16 otto 313: if (revision != NULL) {
1.12 deraadt 314: if (!found_revision) {
315: if (force) {
316: if (verbose)
317: say("Warning: this file doesn't appear "
318: "to be the %s version--patching anyway.\n",
319: revision);
320: } else if (batch) {
321: fatal("this file doesn't appear to be the "
322: "%s version--aborting.\n",
323: revision);
324: } else {
325: ask("This file doesn't appear to be the %s "
326: "version--patch anyway? [n] ",
327: revision);
328: if (*buf != 'y')
329: fatal("aborted\n");
330: }
331: } else if (verbose)
332: say("Good. This file appears to be the %s version.\n",
333: revision);
334: }
1.16 otto 335: fseek(ifp, 0L, SEEK_SET); /* rewind file */
1.12 deraadt 336: tireclen = maxlen;
1.42 tobias 337: tibuflen = maxlen > BUFFERSIZE ? maxlen : BUFFERSIZE;
338: lines_per_buf = tibuflen / maxlen;
339: tibuf[0] = malloc(tibuflen + 1);
1.16 otto 340: if (tibuf[0] == NULL)
1.12 deraadt 341: fatal("out of memory\n");
1.42 tobias 342: tibuf[1] = malloc(tibuflen + 1);
1.16 otto 343: if (tibuf[1] == NULL)
1.12 deraadt 344: fatal("out of memory\n");
345: for (i = 1;; i++) {
1.27 otto 346: p = tibuf[0] + maxlen * (i % lines_per_buf);
347: if (i % lines_per_buf == 0) /* new block */
1.42 tobias 348: if (write(tifd, tibuf[0], tibuflen) !=
349: (ssize_t) tibuflen)
1.12 deraadt 350: pfatal("can't write temp file");
1.27 otto 351: if (fgets(p, maxlen + 1, ifp) == NULL) {
1.12 deraadt 352: input_lines = i - 1;
1.27 otto 353: if (i % lines_per_buf != 0)
1.42 tobias 354: if (write(tifd, tibuf[0], tibuflen) !=
355: (ssize_t) tibuflen)
1.12 deraadt 356: pfatal("can't write temp file");
357: break;
358: }
1.27 otto 359: j = strlen(p);
360: /* These are '\n' terminated strings, so no need to add a NUL */
361: if (j == 0 || p[j - 1] != '\n')
362: p[j] = '\n';
1.12 deraadt 363: }
364: fclose(ifp);
365: close(tifd);
1.49 ! deraadt 366: if ((tifd = open(TMPINNAME, O_RDONLY)) == -1)
1.12 deraadt 367: pfatal("can't reopen file %s", TMPINNAME);
1.1 deraadt 368: }
369:
1.12 deraadt 370: /*
371: * Fetch a line from the input file, \n terminated, not necessarily \0.
372: */
1.1 deraadt 373: char *
1.12 deraadt 374: ifetch(LINENUM line, int whichbuf)
1.1 deraadt 375: {
1.12 deraadt 376: if (line < 1 || line > input_lines) {
1.21 otto 377: if (warn_on_invalid_line) {
378: say("No such line %ld in input file, ignoring\n", line);
1.22 otto 379: warn_on_invalid_line = false;
1.21 otto 380: }
1.18 otto 381: return NULL;
1.12 deraadt 382: }
383: if (using_plan_a)
384: return i_ptr[line];
1.1 deraadt 385: else {
1.12 deraadt 386: LINENUM offline = line % lines_per_buf;
387: LINENUM baseline = line - offline;
388:
389: if (tiline[0] == baseline)
390: whichbuf = 0;
391: else if (tiline[1] == baseline)
392: whichbuf = 1;
393: else {
394: tiline[whichbuf] = baseline;
1.16 otto 395:
1.34 otto 396: if (lseek(tifd, (off_t) (baseline / lines_per_buf *
1.49 ! deraadt 397: tibuflen), SEEK_SET) == -1)
1.34 otto 398: pfatal("cannot seek in the temporary input file");
1.16 otto 399:
1.42 tobias 400: if (read(tifd, tibuf[whichbuf], tibuflen)
401: != (ssize_t) tibuflen)
1.12 deraadt 402: pfatal("error reading tmp file %s", TMPINNAME);
403: }
404: return tibuf[whichbuf] + (tireclen * offline);
1.1 deraadt 405: }
406: }
407:
1.12 deraadt 408: /*
409: * True if the string argument contains the revision number we want.
410: */
1.16 otto 411: static bool
1.19 otto 412: rev_in_string(const char *string)
1.1 deraadt 413: {
1.19 otto 414: const char *s;
1.34 otto 415: size_t patlen;
1.1 deraadt 416:
1.16 otto 417: if (revision == NULL)
1.22 otto 418: return true;
1.12 deraadt 419: patlen = strlen(revision);
1.37 deraadt 420: if (strnEQ(string, revision, patlen) &&
421: isspace((unsigned char)string[patlen]))
1.22 otto 422: return true;
1.12 deraadt 423: for (s = string; *s; s++) {
1.37 deraadt 424: if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
425: isspace((unsigned char)s[patlen + 1])) {
1.22 otto 426: return true;
1.12 deraadt 427: }
1.1 deraadt 428: }
1.22 otto 429: return false;
1.1 deraadt 430: }
![[BACK]](/icons/back.gif){kind=icon}
Return to inp.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / patch