scripts/dtc/srcpos.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
  */

 #define _GNU_SOURCE

 #include <stdio.h>

 #include "dtc.h"
 #include "srcpos.h"

 /* A node in our list of directories to search for source/include files */
 struct search_path {
 	struct search_path *next;	/* next node in list, NULL for end */
 	const char *dirname;		/* name of directory to search */
 };

 /* This is the list of directories that we search for source files */
 static struct search_path *search_path_head, **search_path_tail;

 /* Detect infinite include recursion. */
 #define MAX_SRCFILE_DEPTH     (200)
 static int srcfile_depth; /* = 0 */

 static char *get_dirname(const char *path)
 {
 	const char *slash = strrchr(path, '/');

 	if (slash) {
 		int len = slash - path;
 		char *dir = xmalloc(len + 1);

 		memcpy(dir, path, len);
 		dir[len] = '\0';
 		return dir;
 	}
 	return NULL;
 }

 FILE *depfile; /* = NULL */
 struct srcfile_state *current_srcfile; /* = NULL */
 static char *initial_path; /* = NULL */
 static int initial_pathlen; /* = 0 */
 static bool initial_cpp = true;

 static void set_initial_path(char *fname)
 {
 	int i, len = strlen(fname);

 	xasprintf(&initial_path, "%s", fname);
 	initial_pathlen = 0;
 	for (i = 0; i != len; i++)
 		if (initial_path[i] == '/')
 			initial_pathlen++;
 }

 static char *shorten_to_initial_path(char *fname)
 {
 	char *p1, *p2, *prevslash1 = NULL;
 	int slashes = 0;

 	for (p1 = fname, p2 = initial_path; *p1 && *p2; p1++, p2++) {
 		if (*p1 != *p2)
 			break;
 		if (*p1 == '/') {
 			prevslash1 = p1;
 			slashes++;
 		}
 	}
 	p1 = prevslash1 + 1;
 	if (prevslash1) {
 		int diff = initial_pathlen - slashes, i, j;
 		int restlen = strlen(fname) - (p1 - fname);
 		char *res;

 		res = xmalloc((3 * diff) + restlen + 1);
 		for (i = 0, j = 0; i != diff; i++) {
 			res[j++] = '.';
 			res[j++] = '.';
 			res[j++] = '/';
 		}
 		strcpy(res + j, p1);
 		return res;
 	}
 	return NULL;
 }

 /**
  * Try to open a file in a given directory.
  *
  * If the filename is an absolute path, then dirname is ignored. If it is a
  * relative path, then we look in that directory for the file.
  *
  * @param dirname	Directory to look in, or NULL for none
  * @param fname		Filename to look for
  * @param fp		Set to NULL if file did not open
  * @return allocated filename on success (caller must free), NULL on failure
  */
 static char *try_open(const char *dirname, const char *fname, FILE **fp)
 {
 	char *fullname;

 	if (!dirname || fname[0] == '/')
 		fullname = xstrdup(fname);
 	else
 		fullname = join_path(dirname, fname);

 	*fp = fopen(fullname, "rb");
 	if (!*fp) {
 		free(fullname);
 		fullname = NULL;
 	}

 	return fullname;
 }

 /**
  * Open a file for read access
  *
  * If it is a relative filename, we search the full search path for it.
  *
  * @param fname	Filename to open
  * @param fp	Returns pointer to opened FILE, or NULL on failure
  * @return pointer to allocated filename, which caller must free
  */
 static char *fopen_any_on_path(const char *fname, FILE **fp)
 {
 	const char *cur_dir = NULL;
 	struct search_path *node;
 	char *fullname;

 	/* Try current directory first */
 	assert(fp);
 	if (current_srcfile)
 		cur_dir = current_srcfile->dir;
 	fullname = try_open(cur_dir, fname, fp);

 	/* Failing that, try each search path in turn */
 	for (node = search_path_head; !*fp && node; node = node->next)
 		fullname = try_open(node->dirname, fname, fp);

 	return fullname;
 }

 FILE *srcfile_relative_open(const char *fname, char **fullnamep)
 {
 	FILE *f;
 	char *fullname;

 	if (streq(fname, "-")) {
 		f = stdin;
 		fullname = xstrdup("<stdin>");
 	} else {
 		fullname = fopen_any_on_path(fname, &f);
 		if (!f)
 			die("Couldn't open \"%s\": %s\n", fname,
 			    strerror(errno));
 	}

 	if (depfile)
 		fprintf(depfile, " %s", fullname);

 	if (fullnamep)
 		*fullnamep = fullname;
 	else
 		free(fullname);

 	return f;
 }

 void srcfile_push(const char *fname)
 {
 	struct srcfile_state *srcfile;

 	if (srcfile_depth++ >= MAX_SRCFILE_DEPTH)
 		die("Includes nested too deeply");

 	srcfile = xmalloc(sizeof(*srcfile));

 	srcfile->f = srcfile_relative_open(fname, &srcfile->name);
 	srcfile->dir = get_dirname(srcfile->name);
 	srcfile->prev = current_srcfile;

 	srcfile->lineno = 1;
 	srcfile->colno = 1;

 	current_srcfile = srcfile;

 	if (srcfile_depth == 1)
 		set_initial_path(srcfile->name);
 }

 bool srcfile_pop(void)
 {
 	struct srcfile_state *srcfile = current_srcfile;

 	assert(srcfile);

 	current_srcfile = srcfile->prev;

 	if (fclose(srcfile->f))
 		die("Error closing \"%s\": %s\n", srcfile->name,
 		    strerror(errno));

 	/* FIXME: We allow the srcfile_state structure to leak,
 	 * because it could still be referenced from a location
 	 * variable being carried through the parser somewhere.  To
 	 * fix this we could either allocate all the files from a
 	 * table, or use a pool allocator. */

 	return current_srcfile ? true : false;
 }

 void srcfile_add_search_path(const char *dirname)
 {
 	struct search_path *node;

 	/* Create the node */
 	node = xmalloc(sizeof(*node));
 	node->next = NULL;
 	node->dirname = xstrdup(dirname);

 	/* Add to the end of our list */
 	if (search_path_tail)
 		*search_path_tail = node;
 	else
 		search_path_head = node;
 	search_path_tail = &node->next;
 }

 void srcpos_update(struct srcpos *pos, const char *text, int len)
 {
 	int i;

 	pos->file = current_srcfile;

 	pos->first_line = current_srcfile->lineno;
 	pos->first_column = current_srcfile->colno;

 	for (i = 0; i < len; i++)
 		if (text[i] == '\n') {
 			current_srcfile->lineno++;
 			current_srcfile->colno = 1;
 		} else {
 			current_srcfile->colno++;
 		}

 	pos->last_line = current_srcfile->lineno;
 	pos->last_column = current_srcfile->colno;
 }

 struct srcpos *
 srcpos_copy(struct srcpos *pos)
 {
 	struct srcpos *pos_new;
 	struct srcfile_state *srcfile_state;

 	if (!pos)
 		return NULL;

 	pos_new = xmalloc(sizeof(struct srcpos));
 	assert(pos->next == NULL);
 	memcpy(pos_new, pos, sizeof(struct srcpos));

 	/* allocate without free */
 	srcfile_state = xmalloc(sizeof(struct srcfile_state));
 	memcpy(srcfile_state, pos->file, sizeof(struct srcfile_state));
 	pos_new->file = srcfile_state;

 	return pos_new;
 }

 struct srcpos *srcpos_extend(struct srcpos *pos, struct srcpos *newtail)
 {
 	struct srcpos *p;

 	if (!pos)
 		return newtail;

 	for (p = pos; p->next != NULL; p = p->next);
 	p->next = newtail;
 	return pos;
 }

 char *
 srcpos_string(struct srcpos *pos)
 {
 	const char *fname = "<no-file>";
 	char *pos_str;

 	if (pos->file && pos->file->name)
 		fname = pos->file->name;


 	if (pos->first_line != pos->last_line)
 		xasprintf(&pos_str, "%s:%d.%d-%d.%d", fname,
 			  pos->first_line, pos->first_column,
 			  pos->last_line, pos->last_column);
 	else if (pos->first_column != pos->last_column)
 		xasprintf(&pos_str, "%s:%d.%d-%d", fname,
 			  pos->first_line, pos->first_column,
 			  pos->last_column);
 	else
 		xasprintf(&pos_str, "%s:%d.%d", fname,
 			  pos->first_line, pos->first_column);

 	return pos_str;
 }

 static char *
 srcpos_string_comment(struct srcpos *pos, bool first_line, int level)
 {
 	char *pos_str, *fname, *first, *rest;
 	bool fresh_fname = false;

 	if (!pos) {
 		if (level > 1) {
 			xasprintf(&pos_str, "<no-file>:<no-line>");
 			return pos_str;
 		} else {
 			return NULL;
 		}
 	}

 	if (!pos->file)
 		fname = "<no-file>";
 	else if (!pos->file->name)
 		fname = "<no-filename>";
 	else if (level > 1)
 		fname = pos->file->name;
 	else {
 		fname = shorten_to_initial_path(pos->file->name);
 		if (fname)
 			fresh_fname = true;
 		else
 			fname = pos->file->name;
 	}

 	if (level > 1)
 		xasprintf(&first, "%s:%d:%d-%d:%d", fname,
 			  pos->first_line, pos->first_column,
 			  pos->last_line, pos->last_column);
 	else
 		xasprintf(&first, "%s:%d", fname,
 			  first_line ? pos->first_line : pos->last_line);

 	if (fresh_fname)
 		free(fname);

 	if (pos->next != NULL) {
 		rest = srcpos_string_comment(pos->next, first_line, level);
 		xasprintf(&pos_str, "%s, %s", first, rest);
 		free(first);
 		free(rest);
 	} else {
 		pos_str = first;
 	}

 	return pos_str;
 }

 char *srcpos_string_first(struct srcpos *pos, int level)
 {
 	return srcpos_string_comment(pos, true, level);
 }

 char *srcpos_string_last(struct srcpos *pos, int level)
 {
 	return srcpos_string_comment(pos, false, level);
 }

 void srcpos_verror(struct srcpos *pos, const char *prefix,
 		   const char *fmt, va_list va)
 {
 	char *srcstr;

 	srcstr = srcpos_string(pos);

 	fprintf(stderr, "%s: %s ", prefix, srcstr);
 	vfprintf(stderr, fmt, va);
 	fprintf(stderr, "\n");

 	free(srcstr);
 }

 void srcpos_error(struct srcpos *pos, const char *prefix,
 		  const char *fmt, ...)
 {
 	va_list va;

 	va_start(va, fmt);
 	srcpos_verror(pos, prefix, fmt, va);
 	va_end(va);
 }

 void srcpos_set_line(char *f, int l)
 {
 	current_srcfile->name = f;
 	current_srcfile->lineno = l;

 	if (initial_cpp) {
 		initial_cpp = false;
 		set_initial_path(f);
 	}
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
	*/

	#define _GNU_SOURCE

	#include <stdio.h>

	#include "dtc.h"
	#include "srcpos.h"

	/* A node in our list of directories to search for source/include files */
	struct search_path {
	struct search_path next; / next node in list, NULL for end */
	const char dirname; / name of directory to search */
	};

	/* This is the list of directories that we search for source files */
	static struct search_path search_path_head, *search_path_tail;

	/* Detect infinite include recursion. */
	#define MAX_SRCFILE_DEPTH (200)
	static int srcfile_depth; /* = 0 */

	static char get_dirname(const char path)
	{
	const char *slash = strrchr(path, '/');

	if (slash) {
	int len = slash - path;
	char *dir = xmalloc(len + 1);

	memcpy(dir, path, len);
	dir[len] = '\0';
	return dir;
	}
	return NULL;
	}

	FILE depfile; / = NULL */
	struct srcfile_state current_srcfile; / = NULL */
	static char initial_path; / = NULL */
	static int initial_pathlen; /* = 0 */
	static bool initial_cpp = true;

	static void set_initial_path(char *fname)
	{
	int i, len = strlen(fname);

	xasprintf(&initial_path, "%s", fname);
	initial_pathlen = 0;
	for (i = 0; i != len; i++)
	if (initial_path[i] == '/')
	initial_pathlen++;
	}

	static char shorten_to_initial_path(char fname)
	{
	char p1, p2, *prevslash1 = NULL;
	int slashes = 0;

	for (p1 = fname, p2 = initial_path; p1 && p2; p1++, p2++) {
	if (p1 != p2)
	break;
	if (*p1 == '/') {
	prevslash1 = p1;
	slashes++;
	}
	}
	p1 = prevslash1 + 1;
	if (prevslash1) {
	int diff = initial_pathlen - slashes, i, j;
	int restlen = strlen(fname) - (p1 - fname);
	char *res;

	res = xmalloc((3 * diff) + restlen + 1);
	for (i = 0, j = 0; i != diff; i++) {
	res[j++] = '.';
	res[j++] = '.';
	res[j++] = '/';
	}
	strcpy(res + j, p1);
	return res;
	}
	return NULL;
	}

	/**
	* Try to open a file in a given directory.
	*
	* If the filename is an absolute path, then dirname is ignored. If it is a
	* relative path, then we look in that directory for the file.
	*
	* @param dirname Directory to look in, or NULL for none
	* @param fname Filename to look for
	* @param fp Set to NULL if file did not open
	* @return allocated filename on success (caller must free), NULL on failure
	*/
	static char try_open(const char dirname, const char fname, FILE *fp)
	{
	char *fullname;

	if (!dirname \|\| fname[0] == '/')
	fullname = xstrdup(fname);
	else
	fullname = join_path(dirname, fname);

	*fp = fopen(fullname, "rb");
	if (!*fp) {
	free(fullname);
	fullname = NULL;
	}

	return fullname;
	}

	/**
	* Open a file for read access
	*
	* If it is a relative filename, we search the full search path for it.
	*
	* @param fname Filename to open
	* @param fp Returns pointer to opened FILE, or NULL on failure
	* @return pointer to allocated filename, which caller must free
	*/
	static char fopen_any_on_path(const char fname, FILE **fp)
	{
	const char *cur_dir = NULL;
	struct search_path *node;
	char *fullname;

	/* Try current directory first */
	assert(fp);
	if (current_srcfile)
	cur_dir = current_srcfile->dir;
	fullname = try_open(cur_dir, fname, fp);

	/* Failing that, try each search path in turn */
	for (node = search_path_head; !*fp && node; node = node->next)
	fullname = try_open(node->dirname, fname, fp);

	return fullname;
	}

	FILE srcfile_relative_open(const char fname, char **fullnamep)
	{
	FILE *f;
	char *fullname;

	if (streq(fname, "-")) {
	f = stdin;
	fullname = xstrdup("<stdin>");
	} else {
	fullname = fopen_any_on_path(fname, &f);
	if (!f)
	die("Couldn't open \"%s\": %s\n", fname,
	strerror(errno));
	}

	if (depfile)
	fprintf(depfile, " %s", fullname);

	if (fullnamep)
	*fullnamep = fullname;
	else
	free(fullname);

	return f;
	}

	void srcfile_push(const char *fname)
	{
	struct srcfile_state *srcfile;

	if (srcfile_depth++ >= MAX_SRCFILE_DEPTH)
	die("Includes nested too deeply");

	srcfile = xmalloc(sizeof(*srcfile));

	srcfile->f = srcfile_relative_open(fname, &srcfile->name);
	srcfile->dir = get_dirname(srcfile->name);
	srcfile->prev = current_srcfile;

	srcfile->lineno = 1;
	srcfile->colno = 1;

	current_srcfile = srcfile;

	if (srcfile_depth == 1)
	set_initial_path(srcfile->name);
	}

	bool srcfile_pop(void)
	{
	struct srcfile_state *srcfile = current_srcfile;

	assert(srcfile);

	current_srcfile = srcfile->prev;

	if (fclose(srcfile->f))
	die("Error closing \"%s\": %s\n", srcfile->name,
	strerror(errno));

	/* FIXME: We allow the srcfile_state structure to leak,
	* because it could still be referenced from a location
	* variable being carried through the parser somewhere. To
	* fix this we could either allocate all the files from a
	* table, or use a pool allocator. */

	return current_srcfile ? true : false;
	}

	void srcfile_add_search_path(const char *dirname)
	{
	struct search_path *node;

	/* Create the node */
	node = xmalloc(sizeof(*node));
	node->next = NULL;
	node->dirname = xstrdup(dirname);

	/* Add to the end of our list */
	if (search_path_tail)
	*search_path_tail = node;
	else
	search_path_head = node;
	search_path_tail = &node->next;
	}

	void srcpos_update(struct srcpos pos, const char text, int len)
	{
	int i;

	pos->file = current_srcfile;

	pos->first_line = current_srcfile->lineno;
	pos->first_column = current_srcfile->colno;

	for (i = 0; i < len; i++)
	if (text[i] == '\n') {
	current_srcfile->lineno++;
	current_srcfile->colno = 1;
	} else {
	current_srcfile->colno++;
	}

	pos->last_line = current_srcfile->lineno;
	pos->last_column = current_srcfile->colno;
	}

	struct srcpos *
	srcpos_copy(struct srcpos *pos)
	{
	struct srcpos *pos_new;
	struct srcfile_state *srcfile_state;

	if (!pos)
	return NULL;

	pos_new = xmalloc(sizeof(struct srcpos));
	assert(pos->next == NULL);
	memcpy(pos_new, pos, sizeof(struct srcpos));

	/* allocate without free */
	srcfile_state = xmalloc(sizeof(struct srcfile_state));
	memcpy(srcfile_state, pos->file, sizeof(struct srcfile_state));
	pos_new->file = srcfile_state;

	return pos_new;
	}

	struct srcpos srcpos_extend(struct srcpos pos, struct srcpos *newtail)
	{
	struct srcpos *p;

	if (!pos)
	return newtail;

	for (p = pos; p->next != NULL; p = p->next);
	p->next = newtail;
	return pos;
	}

	char *
	srcpos_string(struct srcpos *pos)
	{
	const char *fname = "<no-file>";
	char *pos_str;

	if (pos->file && pos->file->name)
	fname = pos->file->name;


	if (pos->first_line != pos->last_line)
	xasprintf(&pos_str, "%s:%d.%d-%d.%d", fname,
	pos->first_line, pos->first_column,
	pos->last_line, pos->last_column);
	else if (pos->first_column != pos->last_column)
	xasprintf(&pos_str, "%s:%d.%d-%d", fname,
	pos->first_line, pos->first_column,
	pos->last_column);
	else
	xasprintf(&pos_str, "%s:%d.%d", fname,
	pos->first_line, pos->first_column);

	return pos_str;
	}

	static char *
	srcpos_string_comment(struct srcpos *pos, bool first_line, int level)
	{
	char pos_str, fname, first, rest;
	bool fresh_fname = false;

	if (!pos) {
	if (level > 1) {
	xasprintf(&pos_str, "<no-file>:<no-line>");
	return pos_str;
	} else {
	return NULL;
	}
	}

	if (!pos->file)
	fname = "<no-file>";
	else if (!pos->file->name)
	fname = "<no-filename>";
	else if (level > 1)
	fname = pos->file->name;
	else {
	fname = shorten_to_initial_path(pos->file->name);
	if (fname)
	fresh_fname = true;
	else
	fname = pos->file->name;
	}

	if (level > 1)
	xasprintf(&first, "%s:%d:%d-%d:%d", fname,
	pos->first_line, pos->first_column,
	pos->last_line, pos->last_column);
	else
	xasprintf(&first, "%s:%d", fname,
	first_line ? pos->first_line : pos->last_line);

	if (fresh_fname)
	free(fname);

	if (pos->next != NULL) {
	rest = srcpos_string_comment(pos->next, first_line, level);
	xasprintf(&pos_str, "%s, %s", first, rest);
	free(first);
	free(rest);
	} else {
	pos_str = first;
	}

	return pos_str;
	}

	char srcpos_string_first(struct srcpos pos, int level)
	{
	return srcpos_string_comment(pos, true, level);
	}

	char srcpos_string_last(struct srcpos pos, int level)
	{
	return srcpos_string_comment(pos, false, level);
	}

	void srcpos_verror(struct srcpos pos, const char prefix,
	const char *fmt, va_list va)
	{
	char *srcstr;

	srcstr = srcpos_string(pos);

	fprintf(stderr, "%s: %s ", prefix, srcstr);
	vfprintf(stderr, fmt, va);
	fprintf(stderr, "\n");

	free(srcstr);
	}

	void srcpos_error(struct srcpos pos, const char prefix,
	const char *fmt, ...)
	{
	va_list va;

	va_start(va, fmt);
	srcpos_verror(pos, prefix, fmt, va);
	va_end(va);
	}

	void srcpos_set_line(char *f, int l)
	{
	current_srcfile->name = f;
	current_srcfile->lineno = l;

	if (initial_cpp) {
	initial_cpp = false;
	set_initial_path(f);
	}
	}