X-Git-Url: http://git.ipfire.org/?a=blobdiff_plain;f=tools%2Fmkenvimage.c;h=8eee72e2572e321bbcf70d516d884708724f7fa4;hb=744247de29453c24f14e29191e0271a29cd0b3c1;hp=bbd3041e36f4e5a2ac909fbe101ecfdd91b6345b;hpb=6d4511b2c6734842de9de21c1bc0db4c3ea28b72;p=people%2Fms%2Fu-boot.git

diff --git a/tools/mkenvimage.c b/tools/mkenvimage.c
index bbd3041e36..8eee72e257 100644
--- a/tools/mkenvimage.c
+++ b/tools/mkenvimage.c
@@ -37,6 +37,8 @@ static void usage(const char *exec_name)
 	       "\t\tkey1=value1\n"
 	       "\t\tkey2=value2\n"
 	       "\t\t...\n"
+	       "\tEmpty lines are skipped, and lines with a # in the first\n"
+	       "\tcolumn are treated as comments (also skipped).\n"
 	       "\t-r : the environment has multiple copies in flash\n"
 	       "\t-b : the target is big endian (default is little endian)\n"
 	       "\t-p <byte> : fill the image with <byte> bytes instead of 0xff bytes\n"
@@ -212,19 +214,14 @@ int main(int argc, char **argv)
 		}
 		ret = close(txt_fd);
 	}
-	/* The +1 is for the additionnal ending \0. See below. */
-	if (filesize + 1 > envsize) {
-		fprintf(stderr, "The input file is larger than the environment partition size\n");
-		return EXIT_FAILURE;
-	}
 
-	/* Replace newlines separating variables with \0 */
-	for (fp = 0, ep = 0 ; fp < filesize ; fp++) {
+	/* Parse a byte at time until reaching the file OR until the environment fills
+	 * up. Check ep against envsize - 1 to allow for extra trailing '\0'. */
+	for (fp = 0, ep = 0 ; fp < filesize && ep < envsize - 1; fp++) {
 		if (filebuf[fp] == '\n') {
-			if (ep == 0) {
+			if (fp == 0 || filebuf[fp-1] == '\n') {
 				/*
-				 * Newlines at the beginning of the file ?
-				 * Ignore them.
+				 * Skip empty lines.
 				 */
 				continue;
 			} else if (filebuf[fp-1] == '\\') {
@@ -240,10 +237,33 @@ int main(int argc, char **argv)
 				/* End of a variable */
 				envptr[ep++] = '\0';
 			}
+		} else if ((fp == 0 || filebuf[fp-1] == '\n') && filebuf[fp] == '#') {
+			/* Comment, skip the line. */
+			while (++fp < filesize && filebuf[fp] != '\n')
+			continue;
 		} else {
 			envptr[ep++] = filebuf[fp];
 		}
 	}
+	/* If there are more bytes in the file still, it means the env filled up
+	 * before parsing the whole file.  Eat comments & whitespace here to see if
+	 * there was anything meaning full left in the file, and if so, throw a error
+	 * and exit. */
+	for( ; fp < filesize; fp++ )
+	{
+		if (filebuf[fp] == '\n') {
+			if (fp == 0 || filebuf[fp-1] == '\n') {
+				/* Ignore blank lines */
+				continue;
+			}
+		} else if ((fp == 0 || filebuf[fp-1] == '\n') && filebuf[fp] == '#') {
+			while (++fp < filesize && filebuf[fp] != '\n')
+			continue;
+		} else {
+			fprintf(stderr, "The environment file is too large for the target environment storage\n");
+			return EXIT_FAILURE;
+		}
+	}
 	/*
 	 * Make sure there is a final '\0'
 	 * And do it again on the next byte to mark the end of the environment.