Split out fucntions/definintions in a separate file

c-code/binary_storage.c

+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <byteswap.h>
+#include <sys/time.h>
+#include "binary_storage.h"
+
+unsigned long encodeDbl(double a){
+    unsigned long b;
+    unsigned char *src = (unsigned char *)&a,
+                  *dst = (unsigned char *)&b;
+        dst[0] = src[7];
+        dst[1] = src[6];
+        dst[2] = src[5];
+        dst[3] = src[4];
+        dst[4] = src[3];
+        dst[5] = src[2];
+        dst[6] = src[1];
+        dst[7] = src[0];
+    return b;
+}
+
+BinaryStorage bs_open(char* filename){
+   BinaryStorage storage;
+   storage.file = fopen(filename,"wb");
+   storage.buf_size = 500;
+   storage.con_idx = 0;
+   storage.contents = (long*) malloc(sizeof(unsigned long)*storage.buf_size);
+
+   char header[]="SNS-BIET2020"; 
+   fwrite(header,sizeof(header)-1,1,storage.file);
+   storage.contents[storage.con_idx]=ftell(storage.file);
+   storage.con_idx++;
+
+   return storage;
+}
+
+int write_record(BinaryStorage *bs, char* name, TSTMP timestamp, double value, TAGS *tags){
+  unsigned char name_len = strlen(name);
+
+  int i=0;
+  unsigned int tag_length=0;
+  for(i=0;i<tags->num;i++){
+    tag_length+=strlen(tags->data[i])+2;
+  }
+
+  unsigned int total_length = bswap_32(1+1+name_len+1+8+1+8+1+tag_length);
+  fwrite(&total_length,4,1,bs->file);
+
+/* name */
+  fputc(1,bs->file);
+  fwrite(&name_len,1,1,bs->file);
+  fwrite(name, 1,name_len,bs->file);
+
+/* timestamp */
+  fputc(2,bs->file);
+  unsigned int sec = bswap_32(timestamp.seconds);
+  unsigned int nano = bswap_32(timestamp.nanos); 
+  fwrite(&sec,4,1,bs->file);
+  fwrite(&nano,4,1,bs->file);
+
+/* double scalar */
+  fputc(17,bs->file);
+  unsigned long rawdata = encodeDbl(value);
+  fwrite(&rawdata,8,1,bs->file);
+
+/* tags */
+  for(i=0;i<tags->num;i++){
+    unsigned char tag_len = strlen(tags->data[i]);
+    fputc(4,bs->file);
+    fputc(tag_len,bs->file);
+    fwrite(tags->data[i],1,tag_len,bs->file);
+  }
+
+/* end of record */
+  fputc(254,bs->file);
+
+  bs->contents[bs->con_idx]=ftell(bs->file);  
+  bs->con_idx++;
+}
+
+void bs_close(BinaryStorage *bs){
+   unsigned int total_length = bswap_32(1+1);
+   fwrite(&total_length,4,1,bs->file);
+   fputc(255,bs->file);
+   fputc(254,bs->file);
+   bs->contents[bs->con_idx]=ftell(bs->file);
+   bs->con_idx++;
+   int i;
+   for(i=0;i<bs->con_idx;i++){
+      unsigned long swapped = bswap_64(bs->contents[i]);
+      fwrite(&swapped,8,1,bs->file);
+   }
+   unsigned int num_of_rec = bswap_32(bs->con_idx);
+   fwrite(&num_of_rec,4,1,bs->file);
+
+   fclose(bs->file);
+   free(bs->contents);
+}

c-code/binary_storage.h

+typedef struct tagset {
+  char **data;
+  size_t num;
+} TAGS;
+
+typedef struct timestamp {
+  unsigned int seconds;
+  unsigned int nanos;
+} TSTMP;
+
+typedef struct storage {
+  FILE* file;
+  unsigned long* contents;
+  unsigned int con_idx;
+  size_t buf_size;
+} BinaryStorage;
+
+BinaryStorage bs_open(char* filename);
+int write_record(BinaryStorage *bs, char* name, TSTMP timestamp, double value, TAGS *tags);
+void bs_close(BinaryStorage *bs);
+
+
+

c-code/test_code.c

 #include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <byteswap.h>
 #include <sys/time.h>
-
-unsigned long encodeDbl(double a){
-    unsigned long b;
-    unsigned char *src = (unsigned char *)&a,
-                  *dst = (unsigned char *)&b;
-        dst[0] = src[7];
-        dst[1] = src[6];
-        dst[2] = src[5];
-        dst[3] = src[4];
-        dst[4] = src[3];
-        dst[5] = src[2];
-        dst[6] = src[1];
-        dst[7] = src[0];
-    return b;
-}
-
-typedef struct tagset {
-  char **data;
-  size_t num;
-} TAGS;
-
-typedef struct timestamp {
-  unsigned int seconds;
-  unsigned int nanos;
-} TSTMP;
-
-typedef struct storage {
-  FILE* file;
-  unsigned long* contents;
-  unsigned int con_idx;
-  size_t buf_size;
-} BinaryStorage;
-
-BinaryStorage bs_open(char* filename){
-   BinaryStorage storage;
-   storage.file = fopen(filename,"wb");
-   storage.buf_size = 500;
-   storage.con_idx = 0;
-   storage.contents = (long*) malloc(sizeof(unsigned long)*storage.buf_size);
-
-   char header[]="SNS-BIET2020"; 
-   fwrite(header,sizeof(header)-1,1,storage.file);
-   storage.contents[storage.con_idx]=ftell(storage.file);
-   storage.con_idx++;
-
-   return storage;
-}
-
-int write_record(BinaryStorage *bs, char* name, TSTMP timestamp, double value, TAGS *tags){
-  unsigned char name_len = strlen(name);
-
-  int i=0;
-  unsigned int tag_length=0;
-  for(i=0;i<tags->num;i++){
-    tag_length+=strlen(tags->data[i])+2;
-  }
-
-  unsigned int total_length = bswap_32(1+1+name_len+1+8+1+8+1+tag_length);
-  
-
-
-
-  printf("%d\n",tags->num);
-  fwrite(&total_length,4,1,bs->file);
-
-/* name */
-  fputc(1,bs->file);
-  fwrite(&name_len,1,1,bs->file);
-  fwrite(name, 1,name_len,bs->file);
-
-/* timestamp */
-  fputc(2,bs->file);
-  unsigned int sec = bswap_32(timestamp.seconds);
-  unsigned int nano = bswap_32(timestamp.nanos); 
-  fwrite(&sec,4,1,bs->file);
-  fwrite(&nano,4,1,bs->file);
-
-/* double scalar */
-  fputc(17,bs->file);
-  unsigned long rawdata = encodeDbl(value);
-  fwrite(&rawdata,8,1,bs->file);
-
-/* tags */
-  for(i=0;i<tags->num;i++){
-    unsigned char tag_len = strlen(tags->data[i]);
-    fputc(4,bs->file);
-    fputc(tag_len,bs->file);
-    fwrite(tags->data[i],1,tag_len,bs->file);
-    printf("%s\n",tags->data[i]);
-  }
-
-/* end of record */
-  fputc(254,bs->file);
-
-  bs->contents[bs->con_idx]=ftell(bs->file);  
-  bs->con_idx++;
-}
-
-void bs_close(BinaryStorage *bs){
-   unsigned int total_length = bswap_32(1+1);
-   fwrite(&total_length,4,1,bs->file);
-   fputc(255,bs->file);
-   fputc(254,bs->file);
-   bs->contents[bs->con_idx]=ftell(bs->file);
-   bs->con_idx++;
-   int i;
-   for(i=0;i<bs->con_idx;i++){
-      unsigned long swapped = bswap_64(bs->contents[i]);
-      fwrite(&swapped,8,1,bs->file);
-   }
-   unsigned int num_of_rec = bswap_32(bs->con_idx);
-   fwrite(&num_of_rec,4,1,bs->file);
-
-   fclose(bs->file);
-   free(bs->contents);
-}
+#include <binary_storage.h>
 
 int main(){
    struct timeval tp;
@@ -127,8 +9,7 @@ int main(){
 
    char *tag1 = "TAG1";   
    char *data[]={"MEGA_TAG",tag1};
-   TAGS tags={.data=data, .num=2};
-  
+   TAGS tags={.data=data, .num=2}; 
 
    int i=0;
    for(i=0;i<10;i++){