maint: port function definitions to C23

C23 does not allow K&R style function definitions.
Use protyped definitions.  However, don't bother with (void) in
function definitions since C23 prefers (); so prefer () to (void) as
this will work with older compilers anyway.

4 files changed, 8 insertions, 8 deletions

diff --git a/sample/add.c b/sample/add.c
index cadbc3a..d51288c 100644
--- a/sample/add.c
+++ b/sample/add.c
@@ -16,7 +16,8 @@
 
 char a[MAX_DIST];	/* last byte buffer for up to MAX_DIST differences */
 
-int main()
+int
+main ()
 {
   int n;		/* number of differences */
   int i;		/* difference counter */
diff --git a/sample/makecrc.c b/sample/makecrc.c
index 8fa2959..bf789d3 100644
--- a/sample/makecrc.c
+++ b/sample/makecrc.c
@@ -3,7 +3,8 @@
 #include <config.h>
 #include <stdio.h>
 
-main()
+int
+main ()
 /*
   Generate a table for a byte-wise 32-bit CRC calculation on the polynomial:
   x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1.
diff --git a/sample/sub.c b/sample/sub.c
index a06cc9b..ce83a98 100644
--- a/sample/sub.c
+++ b/sample/sub.c
@@ -43,9 +43,8 @@
 
 char a[MAX_DIST];	/* last byte buffer for up to MAX_DIST differences */
 
-int main(argc, argv)
-  int argc;
-  char **argv;
+int
+main (int argc, char **argv)
 {
   int n = 1;		/* number of differences */
   int i;		/* difference counter */
diff --git a/sample/zread.c b/sample/zread.c
index e20de49..e38095c 100644
--- a/sample/zread.c
+++ b/sample/zread.c
@@ -10,9 +10,8 @@
  * Usage: zread [file[.gz]]
  * This programs assumes that gzip is somewhere in your path.
  */
-int main(argc, argv)
-    int argc;
-    char **argv;
+int
+main (int argc, char **argv)
 {
     FILE *infile;
     char cmd[256];