Enhance source position implementation.

Implemented some print and copy routines.
Made empty srcpos objects that will be used later.
Protected .h file from multiple #include's.
Added srcpos_error() and srcpos_warn().

Signed-off-by: Jon Loeliger <jdl@freescale.com>

dtc-parser.y

@@ -27,6 +27,7 @@
 #include "srcpos.h"
 
 extern int yylex(void);
+extern void yyerror(char const *s);
 
 extern struct boot_info *the_boot_info;
 extern int treesource_error;
@@ -208,9 +209,11 @@ propdata:
 
 			if ($6 != 0)
 				if (fseek(file->file, $6, SEEK_SET) != 0)
-					yyerrorf("Couldn't seek to offset %llu in \"%s\": %s",
-						 (unsigned long long)$6,
-						 $4.val, strerror(errno));
+					srcpos_error(&yyloc,
+						     "Couldn't seek to offset %llu in \"%s\": %s",
+						     (unsigned long long)$6,
+						     $4.val,
+						     strerror(errno));
 
 			d = data_copy_file(file->file, $8);
 
@@ -339,26 +342,10 @@ label:
 
 %%
 
-void yyerrorf(char const *s, ...)
+void yyerror(char const *s)
 {
-	const char *fname = srcpos_file ? srcpos_file->name : "<no-file>";
-	va_list va;
-	va_start(va, s);
-
-	if (strcmp(fname, "-") == 0)
-		fname = "stdin";
-
-	fprintf(stderr, "%s:%d ", fname, yylloc.first_line);
-	vfprintf(stderr, s, va);
-	fprintf(stderr, "\n");
-
+	srcpos_error(&yylloc, "%s", s);
 	treesource_error = 1;
-	va_end(va);
-}
-
-void yyerror (char const *s)
-{
-	yyerrorf("%s", s);
 }
 
 static unsigned long long eval_literal(const char *s, int base, int bits)

srcpos.c

@@ -17,18 +17,40 @@
  *                                                                   USA
  */
 
+#define _GNU_SOURCE
+
+#include <stdio.h>
+
 #include "dtc.h"
 #include "srcpos.h"
 
+
 /*
  * Like yylineno, this is the current open file pos.
  */
-
 struct dtc_file *srcpos_file;
 
-static int dtc_open_one(struct dtc_file *file,
-                        const char *search,
-                        const char *fname)
+/*
+ * The empty source position.
+ */
+
+struct dtc_file dtc_empty_file = {
+	.dir = NULL,
+	.name = "<no file>",
+	.file = NULL
+};
+
+srcpos srcpos_empty = {
+	.first_line = 0,
+	.first_column = 0,
+	.last_line = 0,
+	.last_column = 0,
+	.file = &dtc_empty_file
+};
+
+
+static int
+dtc_open_one(struct dtc_file *file, const char *search, const char *fname)
 {
 	char *fullname;
 
@@ -53,8 +75,8 @@ static int dtc_open_one(struct dtc_file *file,
 }
 
 
-struct dtc_file *dtc_open_file(const char *fname,
-                               const struct search_path *search)
+struct dtc_file *
+dtc_open_file(const char *fname, const struct search_path *search)
 {
 	static const struct search_path default_search = { NULL, NULL, NULL };
 
@@ -106,11 +128,113 @@ fail:
 	die("Couldn't open \"%s\": %s\n", fname, strerror(errno));
 }
 
-void dtc_close_file(struct dtc_file *file)
+
+void
+dtc_close_file(struct dtc_file *file)
 {
 	if (fclose(file->file))
 		die("Error closing \"%s\": %s\n", file->name, strerror(errno));
-
-	free(file->dir);
-	free(file);
+}
+
+
+srcpos *
+srcpos_copy(srcpos *pos)
+{
+	srcpos *pos_new;
+
+	pos_new = xmalloc(sizeof(srcpos));
+	memcpy(pos_new, pos, sizeof(srcpos));
+
+	return pos_new;
+}
+
+
+
+void
+srcpos_dump(srcpos *pos)
+{
+	printf("file        : \"%s\"\n",
+	       pos->file ? (char *) pos->file : "<no file>");
+	printf("first_line  : %d\n", pos->first_line);
+	printf("first_column: %d\n", pos->first_column);
+	printf("last_line   : %d\n", pos->last_line);
+	printf("last_column : %d\n", pos->last_column);
+	printf("file        : %s\n", pos->file->name);
+}
+
+
+char *
+srcpos_string(srcpos *pos)
+{
+	const char *fname;
+	char col_buf[100];
+	char *pos_str;
+
+	if (!pos) {
+		fname = "<no-file>";
+	} else if (pos->file->name) {
+		fname = pos->file->name;
+		if (strcmp(fname, "-") == 0)
+			fname = "stdin";
+	} else {
+		fname = "<no-file>";
+	}
+
+	if (pos->first_line == pos->last_line) {
+		if (pos->first_column == pos->last_column) {
+			snprintf(col_buf, sizeof(col_buf),
+				 "%d:%d",
+				 pos->first_line, pos->first_column);
+		} else {
+			snprintf(col_buf, sizeof(col_buf),
+				 "%d:%d-%d",
+				 pos->first_line,
+				 pos->first_column, pos->last_column);
+		}
+
+	} else {
+		snprintf(col_buf, sizeof(col_buf),
+			 "%d:%d - %d:%d",
+			 pos->first_line, pos->first_column,
+			 pos->last_line, pos->last_column);
+	}
+
+	if (asprintf(&pos_str, "%s %s", fname, col_buf) == -1)
+		return "<unknown source position?";
+
+	return pos_str;
+}
+
+
+void
+srcpos_error(srcpos *pos, char const *fmt, ...)
+{
+	const char *srcstr;
+	va_list va;
+	va_start(va, fmt);
+
+	srcstr = srcpos_string(pos);
+
+	fprintf(stderr, "Error: %s ", srcstr);
+	vfprintf(stderr, fmt, va);
+	fprintf(stderr, "\n");
+
+	va_end(va);
+}
+
+
+void
+srcpos_warn(srcpos *pos, char const *fmt, ...)
+{
+	const char *srcstr;
+	va_list va;
+	va_start(va, fmt);
+
+	srcstr = srcpos_string(pos);
+
+	fprintf(stderr, "Warning: %s ", srcstr);
+	vfprintf(stderr, fmt, va);
+	fprintf(stderr, "\n");
+
+	va_end(va);
 }

srcpos.h

@@ -17,6 +17,9 @@
  *                                                                   USA
  */
 
+#ifndef _SRCPOS_H_
+#define _SRCPOS_H_
+
 /*
  * Augment the standard YYLTYPE with a filenum index into an
  * array of all opened filenames.
@@ -69,9 +72,14 @@ typedef struct YYLTYPE {
     while (YYID (0))
 
 
+typedef YYLTYPE srcpos;
 
-extern void yyerror(char const *);
-extern void yyerrorf(char const *, ...) __attribute__((format(printf, 1, 2)));
+/*
+ * Fictional source position used for IR nodes that are
+ * created without otherwise knowing a true source position.
+ * For example,constant definitions from the command line.
+ */
+extern srcpos srcpos_empty;
 
 extern struct dtc_file *srcpos_file;
 
@@ -83,3 +91,14 @@ struct search_path {
 extern struct dtc_file *dtc_open_file(const char *fname,
                                       const struct search_path *search);
 extern void dtc_close_file(struct dtc_file *file);
+
+extern srcpos *srcpos_copy(srcpos *pos);
+extern char *srcpos_string(srcpos *pos);
+extern void srcpos_dump(srcpos *pos);
+
+extern void srcpos_error(srcpos *pos, char const *, ...)
+     __attribute__((format(printf, 2, 3)));
+extern void srcpos_warn(srcpos *pos, char const *, ...)
+     __attribute__((format(printf, 2, 3)));
+
+#endif /* _SRCPOS_H_ */