Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/make/lowparse.c	Lines:	144	189	76.2 %
Date:	2017-11-13	Branches:	99	180	55.0 %


/*	$OpenBSD: lowparse.c,v 1.35 2016/10/21 16:12:38 espie Exp $ */

/* low-level parsing functions. */

/*
 * Copyright (c) 1999,2000 Marc Espie.
 *
 * Extensive code changes for the OpenBSD project.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT 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 OPENBSD
 * PROJECT 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.
 */

#include <assert.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "config.h"
#include "defines.h"
#include "buf.h"
#include "lowparse.h"
#include "error.h"
#include "lst.h"
#include "memory.h"
#include "pathnames.h"
#ifndef LOCATION_TYPE
#include "location.h"
#endif
#include "var.h"


#define READ_MAKEFILES "MAKEFILE_LIST"

/* Input stream structure: file or string.
 * Files have str == NULL, F != NULL.
 * Strings have F == NULL, str != NULL.
 */
struct input_stream {
	Location origin;	/* Name of file and line number */
	FILE *F;		/* Open stream, or NULL if pure string. */
	char *str;		/* Input string, if F == NULL. */

	/* Line buffer. */
	char *ptr;		/* Where we are. */
	char *end;		/* Don't overdo it. */
};

static struct input_stream *current;	/* the input_stream being parsed. */

static LIST input_stack;	/* Stack of input_stream waiting to be parsed
				 * (includes and loop reparses) */

/* record gnode location for proper reporting at runtime */
static Location *post_parse = NULL;

/* input_stream ctors.
 *
 * obj = new_input_file(filename, filehandle);
 *	Create input stream from filename, filehandle. */
static struct input_stream *new_input_file(const char *, FILE *);
/* obj = new_input_string(str, origin);
 *	Create input stream from str, origin. */
static struct input_stream *new_input_string(char *, const Location *);
/* free_input_stream(obj);
 *	Discard consumed input stream, closing files, freeing memory.  */
static void free_input_stream(struct input_stream *);


/* Handling basic character reading.
 * c = read_char();
 *	New character c from current input stream, or EOF at end of stream. */
#define read_char()	\
    current->ptr < current->end ? *current->ptr++ : grab_new_line_and_readchar()
/* char = grab_new_line_and_readchar();
 *	Guts for read_char. Grabs a new line off fgetln when we have
 *	consumed the current line and returns the first char, or EOF at end of
 *	stream.  */
static int grab_new_line_and_readchar(void);
/* c = skip_to_end_of_line();
 *	Skips to the end of the current line, returns either '\n' or EOF.  */
static int skip_to_end_of_line(void);


/* Helper functions to handle basic parsing. */
/* read_logical_line(buffer, firstchar);
 *	Grabs logical line into buffer, the first character has already been
 *	read into firstchar.  */
static void read_logical_line(Buffer, int);

/* firstchar = ParseSkipEmptyLines(buffer);
 *	Scans lines, skipping empty lines. May put some characters into
 *	buffer, returns the first character useful to continue parsing
 *	(e.g., not a backslash or a space. */
static int skip_empty_lines_and_read_char(Buffer);

const char *curdir;
size_t curdir_len;

void
Parse_setcurdir(const char *dir)
{
	curdir = dir;
	curdir_len = strlen(dir);
}

static bool
startswith(const char *f, const char *s, size_t len)
{
	return strncmp(f, s, len) == 0 && f[len] == '/';
}

static const char *
simplify(const char *filename)
{
	if (startswith(filename, curdir, curdir_len))
		return filename + curdir_len + 1;
	else if (startswith(filename, _PATH_DEFSYSPATH,
	    sizeof(_PATH_DEFSYSPATH)-1)) {
	    	size_t sz;
		char *buf;
		sz = strlen(filename) - sizeof(_PATH_DEFSYSPATH)+3;
		buf = emalloc(sz);
		snprintf(buf, sz, "<%s>", filename+sizeof(_PATH_DEFSYSPATH));
		return buf;
	} else
		return filename;
}

static struct input_stream *
new_input_file(const char *name, FILE *stream)
{
	struct input_stream *istream;

	istream = emalloc(sizeof(*istream));
	istream->origin.fname = simplify(name);
	Var_Append(READ_MAKEFILES, name);
	istream->str = NULL;
	/* Naturally enough, we start reading at line 0. */
	istream->origin.lineno = 0;
	istream->F = stream;
	istream->ptr = istream->end = NULL;
	return istream;
}

static void
free_input_stream(struct input_stream *istream)
{
	if (istream->F) {
		if (ferror(istream->F))
			Parse_Error(PARSE_FATAL, "Read error");
		if (fileno(istream->F) != STDIN_FILENO)
			(void)fclose(istream->F);
	}
	free(istream->str);
	/* Note we can't free the file names, as they are embedded in GN
	 * for error reports. */
	free(istream);
}

static struct input_stream *
new_input_string(char *str, const Location *origin)
{
	struct input_stream *istream;

	istream = emalloc(sizeof(*istream));
	/* No malloc, name is always taken from an already existing istream
	 * and strings are used in for loops, so we need to reset the line
	 * counter to an appropriate value. */
	istream->origin = *origin;
	istream->F = NULL;
	istream->ptr = istream->str = str;
	istream->end = str + strlen(str);
	return istream;
}


void
Parse_FromString(char *str, unsigned long lineno)
{
	Location origin;

	origin.fname = current->origin.fname;
	origin.lineno = lineno;
	if (DEBUG(FOR))
		(void)fprintf(stderr, "%s\n----\n", str);

	Lst_Push(&input_stack, current);
	assert(current != NULL);
	current = new_input_string(str, &origin);
}


void
Parse_FromFile(const char *name, FILE *stream)
{
	if (current != NULL)
		Lst_Push(&input_stack, current);
	current = new_input_file(name, stream);
}

bool
Parse_NextFile(void)
{
	if (current != NULL)
		free_input_stream(current);
	current = Lst_Pop(&input_stack);
	return current != NULL;
}

static int
grab_new_line_and_readchar(void)
{
	size_t len;

	if (current->F) {
		current->ptr = fgetln(current->F, &len);
		if (current->ptr) {
			current->end = current->ptr + len;
			return *current->ptr++;
		} else {
			current->end = NULL;
		}
	}
	return EOF;
}

static int
skip_to_end_of_line(void)
{
	if (current->F) {
		if (current->end - current->ptr > 1)
			current->ptr = current->end - 1;
		if (*current->ptr == '\n')
			return *current->ptr++;
		return EOF;
	} else {
		int c;

		do {
			c = read_char();
		} while (c != '\n' && c != EOF);
		return c;
	}
}


char *
Parse_ReadNextConditionalLine(Buffer linebuf)
{
	int c;

	/* If first char isn't dot, skip to end of line, handling \ */
	while ((c = read_char()) != '.') {
		for (;c != '\n'; c = read_char()) {
			if (c == '\\') {
				c = read_char();
				if (c == '\n')
					current->origin.lineno++;
			}
			if (c == EOF)
				/* Unclosed conditional, reported by cond.c */
				return NULL;
		}
		current->origin.lineno++;
	}

	/* This is the line we need to copy */
	return Parse_ReadUnparsedLine(linebuf, "conditional");
}

static void
read_logical_line(Buffer linebuf, int c)
{
	for (;;) {
		if (c == '\n') {
			current->origin.lineno++;
			break;
		}
		if (c == EOF)
			break;
		Buf_AddChar(linebuf, c);
		c = read_char();
		while (c == '\\') {
			c = read_char();
			if (c == '\n') {
				Buf_AddSpace(linebuf);
				current->origin.lineno++;
				do {
					c = read_char();
				} while (c == ' ' || c == '\t');
			} else {
				Buf_AddChar(linebuf, '\\');
				if (c == '\\') {
					Buf_AddChar(linebuf, '\\');
					c = read_char();
				}
				break;
			}
		}
	}
}

char *
Parse_ReadUnparsedLine(Buffer linebuf, const char *type)
{
	int c;

	Buf_Reset(linebuf);
	c = read_char();
	if (c == EOF) {
		Parse_Error(PARSE_FATAL, "Unclosed %s", type);
		return NULL;
	}

	/* Handle '\' at beginning of line, since \\n needs special treatment */
	while (c == '\\') {
		c = read_char();
		if (c == '\n') {
			current->origin.lineno++;
			do {
				c = read_char();
			} while (c == ' ' || c == '\t');
		} else {
			Buf_AddChar(linebuf, '\\');
			if (c == '\\') {
				Buf_AddChar(linebuf, '\\');
				c = read_char();
			}
			break;
		}
	}
	read_logical_line(linebuf, c);

	return Buf_Retrieve(linebuf);
}

/* This is a fairly complex function, but without it, we could not skip
 * blocks of comments without reading them. */
static int
skip_empty_lines_and_read_char(Buffer linebuf)
{
	int c;		/* the current character */

	for (;;) {
		Buf_Reset(linebuf);
		c = read_char();
		/* Strip leading spaces, fold on '\n' */
		if (c == ' ') {
			do {
				c = read_char();
			} while (c == ' ' || c == '\t');
			while (c == '\\') {
				c = read_char();
				if (c == '\n') {
					current->origin.lineno++;
					do {
						c = read_char();
					} while (c == ' ' || c == '\t');
				} else {
					Buf_AddChar(linebuf, '\\');
					if (c == '\\') {
						Buf_AddChar(linebuf, '\\');
						c = read_char();
					}
					if (c == EOF)
						return '\n';
					else
						return c;
				}
			}
			assert(c != '\t');
		}
		if (c == '#')
			c = skip_to_end_of_line();
		/* Almost identical to spaces, except this occurs after
		 * comments have been taken care of, and we keep the tab
		 * itself.  */
		if (c == '\t') {
			Buf_AddChar(linebuf, '\t');
			do {
				c = read_char();
			} while (c == ' ' || c == '\t');
			while (c == '\\') {
				c = read_char();
				if (c == '\n') {
					current->origin.lineno++;
					do {
						c = read_char();
					} while (c == ' ' || c == '\t');
				} else {
					Buf_AddChar(linebuf, '\\');
					if (c == '\\') {
						Buf_AddChar(linebuf, '\\');
						c = read_char();
					}
					if (c == EOF)
						return '\n';
					else
						return c;
				}
			}
		}
		if (c == '\n')
			current->origin.lineno++;
		else
			return c;
	}
}

/* Parse_ReadNormalLine removes beginning and trailing blanks (but keeps
 * the first tab), handles escaped newlines, and skips over uninteresting
 * lines.
 *
 * The line number is incremented, which implies that continuation
 * lines are numbered with the last line number (we could do better, at a
 * price).
 *
 * Trivial comments are also removed, but we can't do more, as
 * we don't know which lines are shell commands or not.  */
char *
Parse_ReadNormalLine(Buffer linebuf)
{
	int c;		/* the current character */

	c = skip_empty_lines_and_read_char(linebuf);

	if (c == EOF)
		return NULL;
	else {
		read_logical_line(linebuf, c);
		return Buf_Retrieve(linebuf);
	}
}

unsigned long
Parse_Getlineno(void)
{
	return current ? current->origin.lineno : 0;
}

const char *
Parse_Getfilename(void)
{
	return current ? current->origin.fname : NULL;
}

void
Parse_SetLocation(Location *origin)
{
	post_parse = origin;
}

void
Parse_FillLocation(Location *origin)
{
	if (post_parse) {
		*origin = *post_parse;
	} else {
		origin->lineno = Parse_Getlineno();
		origin->fname = Parse_Getfilename();
	}
}

void
Parse_ReportErrors(void)
{
	if (fatal_errors)
		exit(1);
	else
		assert(current == NULL);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: lowparse.c,v 1.35 2016/10/21 16:12:38 espie Exp $ */
2
3			/* low-level parsing functions. */
4
5			/*
6			* Copyright (c) 1999,2000 Marc Espie.
7			*
8			* Extensive code changes for the OpenBSD project.
9			*
10			* Redistribution and use in source and binary forms, with or without
11			* modification, are permitted provided that the following conditions
12			* are met:
13			* 1. Redistributions of source code must retain the above copyright
14			* notice, this list of conditions and the following disclaimer.
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in the
17			* documentation and/or other materials provided with the distribution.
18			*
19			* THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
20			* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21			* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22			* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
23			* PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25			* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29			* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30			*/
31
32			#include <assert.h>
33			#include <stddef.h>
34			#include <stdio.h>
35			#include <stdlib.h>
36			#include <string.h>
37			#include <unistd.h>
38			#include "config.h"
39			#include "defines.h"
40			#include "buf.h"
41			#include "lowparse.h"
42			#include "error.h"
43			#include "lst.h"
44			#include "memory.h"
45			#include "pathnames.h"
46			#ifndef LOCATION_TYPE
47			#include "location.h"
48			#endif
49			#include "var.h"
50
51
52			#define READ_MAKEFILES "MAKEFILE_LIST"
53
54			/* Input stream structure: file or string.
55			* Files have str == NULL, F != NULL.
56			* Strings have F == NULL, str != NULL.
57			*/
58			struct input_stream {
59			Location origin; /* Name of file and line number */
60			FILE F; / Open stream, or NULL if pure string. */
61			char str; / Input string, if F == NULL. */
62
63			/* Line buffer. */
64			char ptr; / Where we are. */
65			char end; / Don't overdo it. */
66			};
67
68			static struct input_stream current; / the input_stream being parsed. */
69
70			static LIST input_stack; /* Stack of input_stream waiting to be parsed
71			* (includes and loop reparses) */
72
73			/* record gnode location for proper reporting at runtime */
74			static Location *post_parse = NULL;
75
76			/* input_stream ctors.
77			*
78			* obj = new_input_file(filename, filehandle);
79			* Create input stream from filename, filehandle. */
80			static struct input_stream new_input_file(const char , FILE *);
81			/* obj = new_input_string(str, origin);
82			* Create input stream from str, origin. */
83			static struct input_stream new_input_string(char , const Location *);
84			/* free_input_stream(obj);
85			* Discard consumed input stream, closing files, freeing memory. */
86			static void free_input_stream(struct input_stream *);
87
88
89			/* Handling basic character reading.
90			* c = read_char();
91			* New character c from current input stream, or EOF at end of stream. */
92			#define read_char() \
93			current->ptr < current->end ? *current->ptr++ : grab_new_line_and_readchar()
94			/* char = grab_new_line_and_readchar();
95			* Guts for read_char. Grabs a new line off fgetln when we have
96			* consumed the current line and returns the first char, or EOF at end of
97			* stream. */
98			static int grab_new_line_and_readchar(void);
99			/* c = skip_to_end_of_line();
100			* Skips to the end of the current line, returns either '\n' or EOF. */
101			static int skip_to_end_of_line(void);
102
103
104			/* Helper functions to handle basic parsing. */
105			/* read_logical_line(buffer, firstchar);
106			* Grabs logical line into buffer, the first character has already been
107			* read into firstchar. */
108			static void read_logical_line(Buffer, int);
109
110			/* firstchar = ParseSkipEmptyLines(buffer);
111			* Scans lines, skipping empty lines. May put some characters into
112			* buffer, returns the first character useful to continue parsing
113			* (e.g., not a backslash or a space. */
114			static int skip_empty_lines_and_read_char(Buffer);
115
116			const char *curdir;
117			size_t curdir_len;
118
119			void
120			Parse_setcurdir(const char *dir)
121			{
122		33706	curdir = dir;
123		16853	curdir_len = strlen(dir);
124		16853	}
125
126			static bool
127			startswith(const char f, const char s, size_t len)
128			{
129	✓✓	1536925	return strncmp(f, s, len) == 0 && f[len] == '/';
130			}
131
132			static const char *
133			simplify(const char *filename)
134			{
135	✓✓	467678	if (startswith(filename, curdir, curdir_len))
136		7668	return filename + curdir_len + 1;
137	✓✓	226171	else if (startswith(filename, _PATH_DEFSYSPATH,
138			sizeof(_PATH_DEFSYSPATH)-1)) {
139			size_t sz;
140			char *buf;
141		149227	sz = strlen(filename) - sizeof(_PATH_DEFSYSPATH)+3;
142		149227	buf = emalloc(sz);
143		149227	snprintf(buf, sz, "<%s>", filename+sizeof(_PATH_DEFSYSPATH));
144			return buf;
145			} else
146		76944	return filename;
147		233839	}
148
149			static struct input_stream *
150			new_input_file(const char name, FILE stream)
151			{
152			struct input_stream *istream;
153
154		467678	istream = emalloc(sizeof(*istream));
155		233839	istream->origin.fname = simplify(name);
156		233839	Var_Append(READ_MAKEFILES, name);
157		233839	istream->str = NULL;
158			/* Naturally enough, we start reading at line 0. */
159		233839	istream->origin.lineno = 0;
160		233839	istream->F = stream;
161		233839	istream->ptr = istream->end = NULL;
162		233839	return istream;
163			}
164
165			static void
166			free_input_stream(struct input_stream *istream)
167			{
168	✓✓	19005950	if (istream->F) {
169	✓✗✗✓ ✗✗	467678	if (ferror(istream->F))
170			Parse_Error(PARSE_FATAL, "Read error");
171	✓✗✓✓	701517	if (fileno(istream->F) != STDIN_FILENO)
172		233820	(void)fclose(istream->F);
173			}
174		9502975	free(istream->str);
175			/* Note we can't free the file names, as they are embedded in GN
176			* for error reports. */
177		9502975	free(istream);
178		9502975	}
179
180			static struct input_stream *
181			new_input_string(char str, const Location origin)
182			{
183			struct input_stream *istream;
184
185		18538272	istream = emalloc(sizeof(*istream));
186			/* No malloc, name is always taken from an already existing istream
187			* and strings are used in for loops, so we need to reset the line
188			* counter to an appropriate value. */
189		9269136	istream->origin = *origin;
190		9269136	istream->F = NULL;
191		9269136	istream->ptr = istream->str = str;
192		9269136	istream->end = str + strlen(str);
193		9269136	return istream;
194			}
195
196
197			void
198			Parse_FromString(char *str, unsigned long lineno)
199			{
200		18538272	Location origin;
201
202		9269136	origin.fname = current->origin.fname;
203		9269136	origin.lineno = lineno;
204	✗✓	9269136	if (DEBUG(FOR))
205			(void)fprintf(stderr, "%s\n----\n", str);
206
207		9269136	Lst_Push(&input_stack, current);
208	✗✓	9269136	assert(current != NULL);
209		9269136	current = new_input_string(str, &origin);
210		9269136	}
211
212
213			void
214			Parse_FromFile(const char name, FILE stream)
215			{
216	✓✓	467678	if (current != NULL)
217		200131	Lst_Push(&input_stack, current);
218		233839	current = new_input_file(name, stream);
219		233839	}
220
221			bool
222			Parse_NextFile(void)
223			{
224	✓✗	19005950	if (current != NULL)
225		9502975	free_input_stream(current);
226		9502975	current = Lst_Pop(&input_stack);
227		9502975	return current != NULL;
228			}
229
230			static int
231			grab_new_line_and_readchar(void)
232			{
233		64924336	size_t len;
234
235	✓✓	32462168	if (current->F) {
236		23193032	current->ptr = fgetln(current->F, &len);
237	✓✓	23193032	if (current->ptr) {
238		22959173	current->end = current->ptr + len;
239		22959173	return *current->ptr++;
240			} else {
241		233859	current->end = NULL;
242			}
243		233859	}
244		9502995	return EOF;
245		32462168	}
246
247			static int
248			skip_to_end_of_line(void)
249			{
250	✓✓	14974080	if (current->F) {
251	✓✓	1492788	if (current->end - current->ptr > 1)
252		1473369	current->ptr = current->end - 1;
253	✓✗	1492788	if (*current->ptr == '\n')
254		1492788	return *current->ptr++;
255			return EOF;
256			} else {
257			int c;
258
259		5994252	do {
260	✓✗	895903827	c = read_char();
261	✓✓	298634609	} while (c != '\n' && c != EOF);
262			return c;
263			}
264		7487040	}
265
266
267			char *
268			Parse_ReadNextConditionalLine(Buffer linebuf)
269			{
270			int c;
271
272			/* If first char isn't dot, skip to end of line, handling \ */
273	✓✓✓✓	75710387	while ((c = read_char()) != '.') {
274	✓✓✓✓	3455995198	for (;c != '\n'; c = read_char()) {
275	✓✓	859761533	if (c == '\\') {
276	✓✗	2677767	c = read_char();
277	✓✓	892589	if (c == '\n')
278		863118	current->origin.lineno++;
279			}
280	✗✓	859761533	if (c == EOF)
281			/* Unclosed conditional, reported by cond.c */
282			return NULL;
283			}
284		8474533	current->origin.lineno++;
285			}
286
287			/* This is the line we need to copy */
288		8362451	return Parse_ReadUnparsedLine(linebuf, "conditional");
289		8362451	}
290
291			static void
292			read_logical_line(Buffer linebuf, int c)
293			{
294		1870331740	for (;;) {
295	✓✓	1818110930	if (c == '\n') {
296		52220790	current->origin.lineno++;
297		52220790	break;
298			}
299	✓✓	1765890140	if (c == EOF)
300			break;
301	✓✓	3531813513	Buf_AddChar(linebuf, c);
302	✓✓	5297670360	c = read_char();
303	✓✓	3535016492	while (c == '\\') {
304	✓✗	5698011	c = read_char();
305	✓✓	1899337	if (c == '\n') {
306	✓✓	3236256	Buf_AddSpace(linebuf);
307		1618126	current->origin.lineno++;
308		1618126	do {
309	✓✓	16859217	c = read_char();
310	✓✓	5619739	} while (c == ' ' \|\| c == '\t');
311			} else {
312	✗✓	562422	Buf_AddChar(linebuf, '\\');
313	✓✓	281211	if (c == '\\') {
314	✗✓	13158	Buf_AddChar(linebuf, '\\');
315	✓✗	19737	c = read_char();
316		6579	}
317			break;
318			}
319			}
320			}
321		52220810	}
322
323			char *
324			Parse_ReadUnparsedLine(Buffer linebuf, const char *type)
325			{
326			int c;
327
328		21272694	Buf_Reset(linebuf);
329	✓✓	31909041	c = read_char();
330	✗✓	10636347	if (c == EOF) {
331			Parse_Error(PARSE_FATAL, "Unclosed %s", type);
332			return NULL;
333			}
334
335			/* Handle '\' at beginning of line, since \\n needs special treatment */
336	✗✓	21272694	while (c == '\\') {
337			c = read_char();
338			if (c == '\n') {
339			current->origin.lineno++;
340			do {
341			c = read_char();
342			} while (c == ' ' \|\| c == '\t');
343			} else {
344			Buf_AddChar(linebuf, '\\');
345			if (c == '\\') {
346			Buf_AddChar(linebuf, '\\');
347			c = read_char();
348			}
349			break;
350			}
351			}
352		10636347	read_logical_line(linebuf, c);
353
354		10636347	return Buf_Retrieve(linebuf);
355		10636347	}
356
357			/* This is a fairly complex function, but without it, we could not skip
358			* blocks of comments without reading them. */
359			static int
360			skip_empty_lines_and_read_char(Buffer linebuf)
361			{
362			int c; /* the current character */
363
364		113532687	for (;;) {
365		62445249	Buf_Reset(linebuf);
366	✓✓	187335747	c = read_char();
367			/* Strip leading spaces, fold on '\n' */
368	✓✓	62445249	if (c == ' ') {
369		26410	do {
370	✓✗	552585	c = read_char();
371	✓✓	184195	} while (c == ' ' \|\| c == '\t');
372	✗✓	52820	while (c == '\\') {
373			c = read_char();
374			if (c == '\n') {
375			current->origin.lineno++;
376			do {
377			c = read_char();
378			} while (c == ' ' \|\| c == '\t');
379			} else {
380			Buf_AddChar(linebuf, '\\');
381			if (c == '\\') {
382			Buf_AddChar(linebuf, '\\');
383			c = read_char();
384			}
385			if (c == EOF)
386			return '\n';
387			else
388			return c;
389			}
390			}
391	✗✓	26410	assert(c != '\t');
392			}
393	✓✓	62445249	if (c == '#')
394		7487040	c = skip_to_end_of_line();
395			/* Almost identical to spaces, except this occurs after
396			* comments have been taken care of, and we keep the tab
397			* itself. */
398	✓✓	62445249	if (c == '\t') {
399	✗✓	27665344	Buf_AddChar(linebuf, '\t');
400		13832672	do {
401	✓✗	41500359	c = read_char();
402	✓✓	13833453	} while (c == ' ' \|\| c == '\t');
403	✗✓	27665344	while (c == '\\') {
404			c = read_char();
405			if (c == '\n') {
406			current->origin.lineno++;
407			do {
408			c = read_char();
409			} while (c == ' ' \|\| c == '\t');
410			} else {
411			Buf_AddChar(linebuf, '\\');
412			if (c == '\\') {
413			Buf_AddChar(linebuf, '\\');
414			c = read_char();
415			}
416			if (c == EOF)
417			return '\n';
418			else
419			return c;
420			}
421			}
422			}
423	✓✓	62445249	if (c == '\n')
424		11357811	current->origin.lineno++;
425			else
426		51087438	return c;
427			}
428		51087438	}
429
430			/* Parse_ReadNormalLine removes beginning and trailing blanks (but keeps
431			* the first tab), handles escaped newlines, and skips over uninteresting
432			* lines.
433			*
434			* The line number is incremented, which implies that continuation
435			* lines are numbered with the last line number (we could do better, at a
436			* price).
437			*
438			* Trivial comments are also removed, but we can't do more, as
439			* we don't know which lines are shell commands or not. */
440			char *
441			Parse_ReadNormalLine(Buffer linebuf)
442			{
443			int c; /* the current character */
444
445		102174876	c = skip_empty_lines_and_read_char(linebuf);
446
447	✓✓	51087438	if (c == EOF)
448		9502975	return NULL;
449			else {
450		41584463	read_logical_line(linebuf, c);
451		41584463	return Buf_Retrieve(linebuf);
452			}
453		51087438	}
454
455			unsigned long
456			Parse_Getlineno(void)
457			{
458	✓✗	99758088	return current ? current->origin.lineno : 0;
459			}
460
461			const char *
462			Parse_Getfilename(void)
463			{
464	✓✗	98940580	return current ? current->origin.fname : NULL;
465			}
466
467			void
468			Parse_SetLocation(Location *origin)
469			{
470		275850	post_parse = origin;
471		137925	}
472
473			void
474			Parse_FillLocation(Location *origin)
475			{
476	✗✓	49455676	if (post_parse) {
477			origin = post_parse;
478			} else {
479		24727838	origin->lineno = Parse_Getlineno();
480		24727838	origin->fname = Parse_Getfilename();
481			}
482		24727838	}
483
484			void
485			Parse_ReportErrors(void)
486			{
487	✗✓	67416	if (fatal_errors)
488			exit(1);
489			else
490	✗✓	33708	assert(current == NULL);
491		33708	}