#define -> static const int. Also got rid of some big static buffers.

rpmunpack.c

@@ -19,7 +19,7 @@
 /*
  * Some general definitions
  */
-#define BUFSIZE		512
+
 #define RPM_MAGIC	"\355\253\356\333"
 #define GZ_MAGIC_1	'\037'
 #define GZ_MAGIC_2	'\213'
@@ -27,14 +27,13 @@
 /*
  * Global variables
  */
-static char buffer[BUFSIZE];
 static char *progname;
 static int infile, outfile;
 
 /*
  * Read a specified number of bytes from input file
  */
-static void myread(int num)
+static void myread(int num, char *buffer)
 {
   int err;
 
@@ -52,6 +51,7 @@ static void myread(int num)
 int rpmunpack_main(int argc, char **argv)
 {
   int len, status = 0;
+  char buffer[BUFSIZ];
 
   /* Get our own program name */
   if ((progname = strrchr(argv[0], '/')) == NULL)
@@ -71,13 +71,13 @@ int rpmunpack_main(int argc, char **argv)
 	perror_msg_and_die("%s", argv[1]);
 
   /* Read magic ID and output filename */
-  myread(4);
+  myread(4, buffer);
   if (strncmp(buffer, RPM_MAGIC, 4)) {
 	fprintf(stderr, "Input file is not in RPM format!\n");
 	exit(1);
   }
-  myread(6);		/* Skip flags */
-  myread(64);
+  myread(6, buffer);		/* Skip flags */
+  myread(64, buffer);
   buffer[64] = '\0';
 
   /* Open output file */
@@ -97,9 +97,9 @@ int rpmunpack_main(int argc, char **argv)
    * never appears before offset 0x200, so we skip these first couple of
    * bytes to make the signature scan a little more reliable.
    */
-  myread(0x200 - 74);
+  myread(0x200 - 74, buffer);
   while (status < 2) {
-	myread(1);
+	myread(1, buffer);
 	if (status == 0 && buffer[0] == GZ_MAGIC_1)
 		status++;
 	else if (status == 1 && buffer[0] == GZ_MAGIC_2)
@@ -113,7 +113,7 @@ int rpmunpack_main(int argc, char **argv)
 	perror_msg_and_die("write");
 
   /* Now simply copy the GZIP archive into the output file */
-  while ((len = read(infile, buffer, BUFSIZE)) > 0) {
+  while ((len = read(infile, buffer, BUFSIZ)) > 0) {
 	if (write(outfile, buffer, len) < 0)
 		perror_msg_and_die("write");
   }