Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/patch/inp.c	Lines:	67	222	30.2 %
Date:	2017-11-07	Branches:	36	166	21.7 %


/*	$OpenBSD: inp.c,v 1.47 2017/03/25 23:13:45 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/types.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/mman.h>

#include <ctype.h>
#include <libgen.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)) < 0)
		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)) < 0)
		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)) < 0)
		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) < 0)
				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;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: inp.c,v 1.47 2017/03/25 23:13:45 deraadt Exp $ */
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			*/
28
29			#include <sys/types.h>
30			#include <sys/file.h>
31			#include <sys/stat.h>
32			#include <sys/mman.h>
33
34			#include <ctype.h>
35			#include <libgen.h>
36			#include <stddef.h>
37			#include <stdint.h>
38			#include <stdio.h>
39			#include <stdlib.h>
40			#include <string.h>
41			#include <unistd.h>
42
43			#include "common.h"
44			#include "util.h"
45			#include "pch.h"
46			#include "inp.h"
47
48
49			/* Input-file-with-indexable-lines abstract type */
50
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 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 */
61
62			static bool rev_in_string(const char *);
63			static bool reallocate_lines(size_t *);
64
65			/* returns false if insufficient memory */
66			static bool plan_a(const char *);
67
68			static void plan_b(const char *);
69
70			/* New patch--prepare to edit another file. */
71
72			void
73			re_input(void)
74			{
75	✓✗	936	if (using_plan_a) {
76		468	free(i_ptr);
77		468	i_ptr = NULL;
78	✓✓	468	if (i_womp != NULL) {
79		432	munmap(i_womp, i_size);
80		432	i_womp = NULL;
81		432	}
82			i_size = 0;
83			} else {
84			using_plan_a = true; /* maybe the next one is smaller */
85			close(tifd);
86			tifd = -1;
87			free(tibuf[0]);
88			free(tibuf[1]);
89			tibuf[0] = tibuf[1] = NULL;
90			tiline[0] = tiline[1] = -1;
91			tireclen = 0;
92			}
93		468	}
94
95			/* Construct the line index, somehow or other. */
96
97			void
98			scan_input(const char *filename)
99			{
100	✗✓	936	if (!plan_a(filename))
101			plan_b(filename);
102	✗✓	468	if (verbose) {
103			say("Patching file %s using Plan %s...\n", filename,
104			(using_plan_a ? "A" : "B"));
105			}
106		468	}
107
108			static bool
109			reallocate_lines(size_t *lines_allocatedp)
110			{
111			char **p;
112			size_t new_size;
113
114		936	new_size = lines_allocatedp 3 / 2;
115		468	p = reallocarray(i_ptr, new_size + 2, sizeof(char *));
116	✗✓	468	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;
121			*lines_allocatedp = 0;
122			return false;
123			}
124		468	*lines_allocatedp = new_size;
125		468	i_ptr = p;
126		468	return true;
127		468	}
128
129			/* Try keeping everything in memory. */
130
131			static bool
132			plan_a(const char *filename)
133			{
134			int ifd, statfailed;
135			char p, s;
136		936	struct stat filestat;
137			off_t i;
138			ptrdiff_t sz;
139		468	size_t iline, lines_allocated;
140
141			#ifdef DEBUGGING
142	✗✓	468	if (debug & 8)
143			return false;
144			#endif
145
146	✓✗✗✓	936	if (filename == NULL \|\| *filename == '\0')
147			return false;
148
149		468	statfailed = stat(filename, &filestat);
150	✗✓✗✗	468	if (statfailed && ok_to_create_file) {
151			int fd;
152
153			if (verbose)
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)
162			return true;
163			makedirs(filename, true);
164			if ((fd = open(filename, O_CREAT \| O_TRUNC \| O_WRONLY, 0666)) != -1)
165			close(fd);
166
167			statfailed = stat(filename, &filestat);
168			}
169	✗✓	468	if (statfailed)
170			fatal("can't find %s\n", filename);
171		468	filemode = filestat.st_mode;
172	✗✓	468	if (!S_ISREG(filemode))
173			fatal("%s is not a normal file--can't patch\n", filename);
174		468	i_size = filestat.st_size;
175	✗✓	468	if (out_of_mem) {
176			set_hunkmax(); /* make sure dynamic arrays are allocated */
177			out_of_mem = false;
178			return false; /* force plan b because plan a bombed */
179			}
180	✗✓	468	if (i_size > SIZE_MAX) {
181			say("block too large to mmap\n");
182			return false;
183			}
184	✗✓	468	if ((ifd = open(filename, O_RDONLY)) < 0)
185			pfatal("can't open file %s", filename);
186
187	✓✓	468	if (i_size) {
188		432	i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
189	✗✓	432	if (i_womp == MAP_FAILED) {
190			perror("mmap failed");
191			i_womp = NULL;
192			close(ifd);
193			return false;
194			}
195			} else {
196		36	i_womp = NULL;
197			}
198
199		468	close(ifd);
200	✓✓	468	if (i_size)
201		432	madvise(i_womp, i_size, MADV_SEQUENTIAL);
202
203			/* estimate the number of lines */
204		468	lines_allocated = i_size / 25;
205		468	if (lines_allocated < 100)
206		468	lines_allocated = 100;
207
208	✗✓	468	if (!reallocate_lines(&lines_allocated))
209			return false;
210
211			/* now scan the buffer and build pointer array */
212			iline = 1;
213		468	i_ptr[iline] = i_womp;
214			/* test for NUL too, to maintain the behavior of the original code */
215	✓✓✓✗	8887716	for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
216	✓✓	2962260	if (*s == '\n') {
217	✗✓	127080	if (iline == lines_allocated) {
218			if (!reallocate_lines(&lines_allocated))
219			return false;
220			}
221			/* these are NOT NUL terminated */
222		127080	i_ptr[++iline] = s + 1;
223		127080	}
224			}
225			/* if the last line contains no EOL, append one */
226	✓✓✓✓	900	if (i_size > 0 && i_womp[i_size - 1] != '\n') {
227		180	last_line_missing_eol = true;
228			/* fix last line */
229		180	sz = s - i_ptr[iline];
230		180	p = malloc(sz + 1);
231	✗✓	180	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			}
238
239		180	memcpy(p, i_ptr[iline], sz);
240		180	p[sz] = '\n';
241		180	i_ptr[iline] = p;
242			/* count the extra line and make it point to some valid mem */
243		180	i_ptr[++iline] = "";
244		180	} else
245		288	last_line_missing_eol = false;
246
247		468	input_lines = iline - 1;
248
249			/* now check for revision, if any */
250
251	✗✓	468	if (revision != NULL) {
252			if (i_womp == NULL \|\| !rev_in_string(i_womp)) {
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			}
273		468	return true; /* plan a will work */
274		468	}
275
276			/* Keep (virtually) nothing in memory. */
277
278			static void
279			plan_b(const char *filename)
280			{
281			FILE *ifp;
282			size_t i = 0, j, len, maxlen = 1;
283			char lbuf = NULL, p;
284			bool found_revision = (revision == NULL);
285
286			using_plan_a = false;
287			if ((ifp = fopen(filename, "r")) == NULL)
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);
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))
307			found_revision = true;
308			if (len > maxlen)
309			maxlen = len; /* find longest line */
310			}
311			free(lbuf);
312			if (ferror(ifp))
313			pfatal("can't read file %s", filename);
314
315			if (revision != NULL) {
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			}
337			fseek(ifp, 0L, SEEK_SET); /* rewind file */
338			tireclen = maxlen;
339			tibuflen = maxlen > BUFFERSIZE ? maxlen : BUFFERSIZE;
340			lines_per_buf = tibuflen / maxlen;
341			tibuf[0] = malloc(tibuflen + 1);
342			if (tibuf[0] == NULL)
343			fatal("out of memory\n");
344			tibuf[1] = malloc(tibuflen + 1);
345			if (tibuf[1] == NULL)
346			fatal("out of memory\n");
347			for (i = 1;; i++) {
348			p = tibuf[0] + maxlen * (i % lines_per_buf);
349			if (i % lines_per_buf == 0) /* new block */
350			if (write(tifd, tibuf[0], tibuflen) !=
351			(ssize_t) tibuflen)
352			pfatal("can't write temp file");
353			if (fgets(p, maxlen + 1, ifp) == NULL) {
354			input_lines = i - 1;
355			if (i % lines_per_buf != 0)
356			if (write(tifd, tibuf[0], tibuflen) !=
357			(ssize_t) tibuflen)
358			pfatal("can't write temp file");
359			break;
360			}
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';
365			}
366			fclose(ifp);
367			close(tifd);
368			if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
369			pfatal("can't reopen file %s", TMPINNAME);
370			}
371
372			/*
373			* Fetch a line from the input file, \n terminated, not necessarily \0.
374			*/
375			char *
376			ifetch(LINENUM line, int whichbuf)
377			{
378	✓✗✗✓	427734	if (line < 1 \|\| line > input_lines) {
379			if (warn_on_invalid_line) {
380			say("No such line %ld in input file, ignoring\n", line);
381			warn_on_invalid_line = false;
382			}
383			return NULL;
384			}
385	✓✗	142578	if (using_plan_a)
386		142578	return i_ptr[line];
387			else {
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;
397
398			if (lseek(tifd, (off_t) (baseline / lines_per_buf *
399			tibuflen), SEEK_SET) < 0)
400			pfatal("cannot seek in the temporary input file");
401
402			if (read(tifd, tibuf[whichbuf], tibuflen)
403			!= (ssize_t) tibuflen)
404			pfatal("error reading tmp file %s", TMPINNAME);
405			}
406			return tibuf[whichbuf] + (tireclen * offline);
407			}
408		142578	}
409
410			/*
411			* True if the string argument contains the revision number we want.
412			*/
413			static bool
414			rev_in_string(const char *string)
415			{
416			const char *s;
417			size_t patlen;
418
419			if (revision == NULL)
420			return true;
421			patlen = strlen(revision);
422			if (strnEQ(string, revision, patlen) &&
423			isspace((unsigned char)string[patlen]))
424			return true;
425			for (s = string; *s; s++) {
426			if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
427			isspace((unsigned char)s[patlen + 1])) {
428			return true;
429			}
430			}
431			return false;
432			}