--- linksys-tftp-1.2.1/tftpsubs.c	2024-04-16 08:27:50.310449884 -0700
+++ linksys-tftp-1.2.1/tftpsubs.c	2024-04-16 08:53:26.084521570 -0700
@@ -38,6 +38,7 @@ static char sccsid[] = "@(#)tftpsubs.c	5
 // modified tftp header to include pass
 #include <tftp.h>
 #include <stdio.h>
+#include <unistd.h>
 
 #define PKTSIZE (1432+4) /* SEGSIZE+4 */      /* should be moved to tftp.h */
 
@@ -60,14 +61,22 @@ static int current;     /* index of buff
 int newline = 0;        /* fillbuf: in middle of newline expansion */
 int prevchar = -1;      /* putbuf: previous char (cr check) */
 
-struct tftphdr *rw_init();
+/* functions declared in this program */
+struct tftphdr *w_init();
+struct tftphdr *r_init();
+struct tftphdr *rw_init(int x);
+int readit(FILE *file,  struct tftphdr **dpp, int convert);
+int read_ahead(FILE *file, int convert);
+int writeit(FILE *file, struct tftphdr **dpp, int ct, int convert);
+int write_behind( FILE *file, int convert);
+int synchnet(int        f);
 
 struct tftphdr *w_init() { return rw_init(0); }         /* write-behind */
 struct tftphdr *r_init() { return rw_init(1); }         /* read-ahead */
 
-struct tftphdr *
-rw_init(x)              /* init for either read-ahead or write-behind */
-int x;                  /* zero for write-behind, one for read-head */
+/* init for either read-ahead or write-behind */
+struct tftphdr *rw_init(int x)
+                     /* zero for write-behind, one for read-head */
 {
 	newline = 0;            /* init crlf flag */
 	prevchar = -1;
@@ -82,10 +91,8 @@ int x;                  /* zero for writ
 /* Have emptied current buffer by sending to net and getting ack.
    Free it and return next buffer filled with data.
  */
-readit(file, dpp, convert)
-	FILE *file;                     /* file opened for read */
-	struct tftphdr **dpp;
-	int convert;                    /* if true, convert to ascii */
+int readit(FILE *file,  struct tftphdr **dpp, int convert)
+    /* file opened for read               if true, convert to ascii */
 {
 	struct bf *b;
 
@@ -104,9 +111,9 @@ readit(file, dpp, convert)
  * fill the input buffer, doing ascii conversions if requested
  * conversions are  lf -> cr,lf  and cr -> cr, nul
  */
-read_ahead(file, convert)
-	FILE *file;                     /* file opened for read */
-	int convert;                    /* if true, convert to ascii */
+int read_ahead(FILE *file, int convert)  
+	/* file opened for read */
+			/* if true, convert to ascii */
 {
 	register int i;
 	register char *p;
@@ -154,16 +161,14 @@ read_ahead(file, convert)
 	       *p++ = c;
 	}
 	b->counter = (int)(p - dp->th_data);
+        return 0;
 }
 
 /* Update count associated with the buffer, get new buffer
    from the queue.  Calls write_behind only if next buffer not
    available.
  */
-writeit(file, dpp, ct, convert)
-	FILE *file;
-	struct tftphdr **dpp;
-	int convert;
+int writeit(FILE *file, struct tftphdr **dpp, int ct, int convert)
 {
 	bfs[current].counter = ct;      /* set size of data to write */
 	current = !current;             /* switch to other buffer */
@@ -180,9 +185,7 @@ writeit(file, dpp, ct, convert)
  * Note spec is undefined if we get CR as last byte of file or a
  * CR followed by anything else.  In this case we leave it alone.
  */
-write_behind(file, convert)
-	FILE *file;
-	int convert;
+int write_behind( FILE *file, int convert)
 {
 	char *buf;
 	int count;
@@ -238,9 +241,8 @@ skipit:
  * when trace is active).
  */
 
-int
-synchnet(f)
-int	f;		/* socket to flush */
+int synchnet(int        f)
+        /* socket to flush */
 {
 	int i, j = 0;
 	char rbuf[PKTSIZE];
@@ -258,4 +260,5 @@ int	f;		/* socket to flush */
 			return(j);
 		}
 	}
+        return 0;   /* should never get here */
 }