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-rw-r--r--usr.bin/patch/inp.c430
1 files changed, 430 insertions, 0 deletions
diff --git a/usr.bin/patch/inp.c b/usr.bin/patch/inp.c
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+++ b/usr.bin/patch/inp.c
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+/* $OpenBSD: inp.c,v 1.49 2019/06/28 13:35:02 deraadt Exp $ */
+
+/*
+ * patch - a program to apply diffs to original files
+ *
+ * Copyright 1986, Larry Wall
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following condition is met:
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this condition and the following disclaimer.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * -C option added in 1998, original code by Marc Espie, based on FreeBSD
+ * behaviour
+ */
+
+#include <sys/stat.h>
+#include <sys/mman.h>
+
+#include <ctype.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "util.h"
+#include "pch.h"
+#include "inp.h"
+
+
+/* Input-file-with-indexable-lines abstract type */
+
+static off_t i_size; /* size of the input file */
+static char *i_womp; /* plan a buffer for entire file */
+static char **i_ptr; /* pointers to lines in i_womp */
+
+static int tifd = -1; /* plan b virtual string array */
+static char *tibuf[2]; /* plan b buffers */
+static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
+static size_t lines_per_buf; /* how many lines per buffer */
+static size_t tibuflen; /* plan b buffer length */
+static size_t tireclen; /* length of records in tmp file */
+
+static bool rev_in_string(const char *);
+static bool reallocate_lines(size_t *);
+
+/* returns false if insufficient memory */
+static bool plan_a(const char *);
+
+static void plan_b(const char *);
+
+/* New patch--prepare to edit another file. */
+
+void
+re_input(void)
+{
+ if (using_plan_a) {
+ free(i_ptr);
+ i_ptr = NULL;
+ if (i_womp != NULL) {
+ munmap(i_womp, i_size);
+ i_womp = NULL;
+ }
+ i_size = 0;
+ } else {
+ using_plan_a = true; /* maybe the next one is smaller */
+ close(tifd);
+ tifd = -1;
+ free(tibuf[0]);
+ free(tibuf[1]);
+ tibuf[0] = tibuf[1] = NULL;
+ tiline[0] = tiline[1] = -1;
+ tireclen = 0;
+ }
+}
+
+/* Construct the line index, somehow or other. */
+
+void
+scan_input(const char *filename)
+{
+ if (!plan_a(filename))
+ plan_b(filename);
+ if (verbose) {
+ say("Patching file %s using Plan %s...\n", filename,
+ (using_plan_a ? "A" : "B"));
+ }
+}
+
+static bool
+reallocate_lines(size_t *lines_allocatedp)
+{
+ char **p;
+ size_t new_size;
+
+ new_size = *lines_allocatedp * 3 / 2;
+ p = reallocarray(i_ptr, new_size + 2, sizeof(char *));
+ if (p == NULL) { /* shucks, it was a near thing */
+ munmap(i_womp, i_size);
+ i_womp = NULL;
+ free(i_ptr);
+ i_ptr = NULL;
+ *lines_allocatedp = 0;
+ return false;
+ }
+ *lines_allocatedp = new_size;
+ i_ptr = p;
+ return true;
+}
+
+/* Try keeping everything in memory. */
+
+static bool
+plan_a(const char *filename)
+{
+ int ifd, statfailed;
+ char *p, *s;
+ struct stat filestat;
+ off_t i;
+ ptrdiff_t sz;
+ size_t iline, lines_allocated;
+
+#ifdef DEBUGGING
+ if (debug & 8)
+ return false;
+#endif
+
+ if (filename == NULL || *filename == '\0')
+ return false;
+
+ statfailed = stat(filename, &filestat);
+ if (statfailed && ok_to_create_file) {
+ int fd;
+
+ if (verbose)
+ say("(Creating file %s...)\n", filename);
+
+ /*
+ * in check_patch case, we still display `Creating file' even
+ * though we're not. The rule is that -C should be as similar
+ * to normal patch behavior as possible
+ */
+ if (check_only)
+ return true;
+ makedirs(filename, true);
+ if ((fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0666)) != -1)
+ close(fd);
+
+ statfailed = stat(filename, &filestat);
+ }
+ if (statfailed)
+ fatal("can't find %s\n", filename);
+ filemode = filestat.st_mode;
+ if (!S_ISREG(filemode))
+ fatal("%s is not a normal file--can't patch\n", filename);
+ i_size = filestat.st_size;
+ if (out_of_mem) {
+ set_hunkmax(); /* make sure dynamic arrays are allocated */
+ out_of_mem = false;
+ return false; /* force plan b because plan a bombed */
+ }
+ if (i_size > SIZE_MAX) {
+ say("block too large to mmap\n");
+ return false;
+ }
+ if ((ifd = open(filename, O_RDONLY)) == -1)
+ pfatal("can't open file %s", filename);
+
+ if (i_size) {
+ i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
+ if (i_womp == MAP_FAILED) {
+ perror("mmap failed");
+ i_womp = NULL;
+ close(ifd);
+ return false;
+ }
+ } else {
+ i_womp = NULL;
+ }
+
+ close(ifd);
+ if (i_size)
+ madvise(i_womp, i_size, MADV_SEQUENTIAL);
+
+ /* estimate the number of lines */
+ lines_allocated = i_size / 25;
+ if (lines_allocated < 100)
+ lines_allocated = 100;
+
+ if (!reallocate_lines(&lines_allocated))
+ return false;
+
+ /* now scan the buffer and build pointer array */
+ iline = 1;
+ i_ptr[iline] = i_womp;
+ /* test for NUL too, to maintain the behavior of the original code */
+ for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
+ if (*s == '\n') {
+ if (iline == lines_allocated) {
+ if (!reallocate_lines(&lines_allocated))
+ return false;
+ }
+ /* these are NOT NUL terminated */
+ i_ptr[++iline] = s + 1;
+ }
+ }
+ /* if the last line contains no EOL, append one */
+ if (i_size > 0 && i_womp[i_size - 1] != '\n') {
+ last_line_missing_eol = true;
+ /* fix last line */
+ sz = s - i_ptr[iline];
+ p = malloc(sz + 1);
+ if (p == NULL) {
+ free(i_ptr);
+ i_ptr = NULL;
+ munmap(i_womp, i_size);
+ i_womp = NULL;
+ return false;
+ }
+
+ memcpy(p, i_ptr[iline], sz);
+ p[sz] = '\n';
+ i_ptr[iline] = p;
+ /* count the extra line and make it point to some valid mem */
+ i_ptr[++iline] = "";
+ } else
+ last_line_missing_eol = false;
+
+ input_lines = iline - 1;
+
+ /* now check for revision, if any */
+
+ if (revision != NULL) {
+ if (i_womp == NULL || !rev_in_string(i_womp)) {
+ if (force) {
+ if (verbose)
+ say("Warning: this file doesn't appear "
+ "to be the %s version--patching anyway.\n",
+ revision);
+ } else if (batch) {
+ fatal("this file doesn't appear to be the "
+ "%s version--aborting.\n",
+ revision);
+ } else {
+ ask("This file doesn't appear to be the "
+ "%s version--patch anyway? [n] ",
+ revision);
+ if (*buf != 'y')
+ fatal("aborted\n");
+ }
+ } else if (verbose)
+ say("Good. This file appears to be the %s version.\n",
+ revision);
+ }
+ return true; /* plan a will work */
+}
+
+/* Keep (virtually) nothing in memory. */
+
+static void
+plan_b(const char *filename)
+{
+ FILE *ifp;
+ size_t i = 0, j, len, maxlen = 1;
+ char *lbuf = NULL, *p;
+ bool found_revision = (revision == NULL);
+
+ using_plan_a = false;
+ if ((ifp = fopen(filename, "r")) == NULL)
+ pfatal("can't open file %s", filename);
+ (void) unlink(TMPINNAME);
+ if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) == -1)
+ pfatal("can't open file %s", TMPINNAME);
+ while ((p = fgetln(ifp, &len)) != NULL) {
+ if (p[len - 1] == '\n')
+ p[len - 1] = '\0';
+ else {
+ /* EOF without EOL, copy and add the NUL */
+ if ((lbuf = malloc(len + 1)) == NULL)
+ fatal("out of memory\n");
+ memcpy(lbuf, p, len);
+ lbuf[len] = '\0';
+ p = lbuf;
+
+ last_line_missing_eol = true;
+ len++;
+ }
+ if (revision != NULL && !found_revision && rev_in_string(p))
+ found_revision = true;
+ if (len > maxlen)
+ maxlen = len; /* find longest line */
+ }
+ free(lbuf);
+ if (ferror(ifp))
+ pfatal("can't read file %s", filename);
+
+ if (revision != NULL) {
+ if (!found_revision) {
+ if (force) {
+ if (verbose)
+ say("Warning: this file doesn't appear "
+ "to be the %s version--patching anyway.\n",
+ revision);
+ } else if (batch) {
+ fatal("this file doesn't appear to be the "
+ "%s version--aborting.\n",
+ revision);
+ } else {
+ ask("This file doesn't appear to be the %s "
+ "version--patch anyway? [n] ",
+ revision);
+ if (*buf != 'y')
+ fatal("aborted\n");
+ }
+ } else if (verbose)
+ say("Good. This file appears to be the %s version.\n",
+ revision);
+ }
+ fseek(ifp, 0L, SEEK_SET); /* rewind file */
+ tireclen = maxlen;
+ tibuflen = maxlen > BUFFERSIZE ? maxlen : BUFFERSIZE;
+ lines_per_buf = tibuflen / maxlen;
+ tibuf[0] = malloc(tibuflen + 1);
+ if (tibuf[0] == NULL)
+ fatal("out of memory\n");
+ tibuf[1] = malloc(tibuflen + 1);
+ if (tibuf[1] == NULL)
+ fatal("out of memory\n");
+ for (i = 1;; i++) {
+ p = tibuf[0] + maxlen * (i % lines_per_buf);
+ if (i % lines_per_buf == 0) /* new block */
+ if (write(tifd, tibuf[0], tibuflen) !=
+ (ssize_t) tibuflen)
+ pfatal("can't write temp file");
+ if (fgets(p, maxlen + 1, ifp) == NULL) {
+ input_lines = i - 1;
+ if (i % lines_per_buf != 0)
+ if (write(tifd, tibuf[0], tibuflen) !=
+ (ssize_t) tibuflen)
+ pfatal("can't write temp file");
+ break;
+ }
+ j = strlen(p);
+ /* These are '\n' terminated strings, so no need to add a NUL */
+ if (j == 0 || p[j - 1] != '\n')
+ p[j] = '\n';
+ }
+ fclose(ifp);
+ close(tifd);
+ if ((tifd = open(TMPINNAME, O_RDONLY)) == -1)
+ pfatal("can't reopen file %s", TMPINNAME);
+}
+
+/*
+ * Fetch a line from the input file, \n terminated, not necessarily \0.
+ */
+char *
+ifetch(LINENUM line, int whichbuf)
+{
+ if (line < 1 || line > input_lines) {
+ if (warn_on_invalid_line) {
+ say("No such line %ld in input file, ignoring\n", line);
+ warn_on_invalid_line = false;
+ }
+ return NULL;
+ }
+ if (using_plan_a)
+ return i_ptr[line];
+ else {
+ LINENUM offline = line % lines_per_buf;
+ LINENUM baseline = line - offline;
+
+ if (tiline[0] == baseline)
+ whichbuf = 0;
+ else if (tiline[1] == baseline)
+ whichbuf = 1;
+ else {
+ tiline[whichbuf] = baseline;
+
+ if (lseek(tifd, (off_t) (baseline / lines_per_buf *
+ tibuflen), SEEK_SET) == -1)
+ pfatal("cannot seek in the temporary input file");
+
+ if (read(tifd, tibuf[whichbuf], tibuflen)
+ != (ssize_t) tibuflen)
+ pfatal("error reading tmp file %s", TMPINNAME);
+ }
+ return tibuf[whichbuf] + (tireclen * offline);
+ }
+}
+
+/*
+ * True if the string argument contains the revision number we want.
+ */
+static bool
+rev_in_string(const char *string)
+{
+ const char *s;
+ size_t patlen;
+
+ if (revision == NULL)
+ return true;
+ patlen = strlen(revision);
+ if (strnEQ(string, revision, patlen) &&
+ isspace((unsigned char)string[patlen]))
+ return true;
+ for (s = string; *s; s++) {
+ if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
+ isspace((unsigned char)s[patlen + 1])) {
+ return true;
+ }
+ }
+ return false;
+}
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