feat: move file2char to library

file2char/file2char.c

@@ -0,0 +1,87 @@
+/*to use exit*/
+#include <stdlib.h>
+/*to use *print**/
+#include <stdio.h>
+/*to user file2char*/
+#include "file2char.h"
+
+int convert_file2char(char const* path, char **buf){
+  /*declarations*/
+  FILE *fp;
+  long lSize;
+
+  /*TODO Check path for validity!*/
+  /*fopen()
+   *filename
+   *mode
+   *return: set errno value in error case
+   */
+  fp=fopen(path,"r");
+
+  if(fp){
+    fprintf(stdout,"file opened.\n");
+
+    /*set offset to file end*/
+    /*fseek()
+     *stream
+     *offset
+     *origin
+     */
+    fseek(fp,0L,SEEK_END);
+    if (ferror(fp)){
+      printf ("Error seeking file\n");
+    }
+
+    /*get file size*/
+    lSize = ftell( fp );
+    fprintf(stdout,"lSize: %ld.\n",lSize);
+
+    /*set offset to file start*/
+    fseek(fp,0,SEEK_SET);
+    if (ferror(fp)){
+      printf ("Error seeking file\n");
+    }
+
+    /*allocate memory for entire content + null termination*/
+    *buf=(char *)malloc((lSize+1)*sizeof(char));
+    if(!*buf){
+      fclose(fp);
+      fputs("Error allocating memory",stderr);
+      exit(EXIT_FAILURE);
+    }
+    fprintf(stdout,"mem allocated.\n");
+
+    /*copy file into buffer*/
+    /*fread()
+     *ptr
+     *size
+     *count
+     *stream
+     */
+    if( 1!=fread(*buf,lSize,1,fp)){
+      fclose(fp);
+      free(*buf);
+      fputs("Error reading entire file",stderr);
+      exit(EXIT_FAILURE);
+    }
+    fprintf(stdout,"file read.\n");
+
+    /*close file*/
+    if(EOF==fclose(fp)){
+      free(*buf);
+      exit(EXIT_FAILURE);
+    }
+    fprintf(stdout,"file closed.\n");
+
+    (*buf)[lSize] = '\0';
+    fprintf(stdout,"mem null terminated.\n");
+
+    printf("buffer = %s\n", *buf);
+    
+  }else{
+    perror(path);
+    exit(EXIT_FAILURE);
+  }
+  /*done*/
+  return 0;
+}

file2char/file2char.h

@@ -0,0 +1,16 @@
+/*We can use CPP tricks to avoid parsing the same header file more than once*/
+#ifndef FILE2CHAR_H
+#define FILE2CHAR_H
+
+/*
+ * convert_file2char reads the file identified by 'path' into a character buffer
+ * pointed at by 'buf'.
+ * On success, 0 is returned.
+ * On failure, exit(EXIT_FAILURE) is returned.
+ *
+ * WARNING: convert_file2char malloc()s memory to '*buf' which must be freed by
+ * the caller.
+ */
+int convert_file2char(char const* path, char **buf);
+
+#endif /* FILE2CHAR_H */

file2char/main.c

@@ -2,105 +2,11 @@
 #include <stdlib.h>
 /*to use *print**/
 #include <stdio.h>
-
-/*
- * load_file reads the file identified by 'path' into a character buffer
- * pointed at by 'buf'.
- * On success, the size of the file is returned.
- * On failure, exit(EXIT_FAILURE) is returned and.
- *
- * WARNING: load_file malloc()s memory to '*buf' which must be freed by
- * the caller.
- */
-int load_file(char const* path, char **buf){
-  /*declarations*/
-  FILE *fp;
-  long lSize;
-
-  /*fopen()
-   *filename
-   *mode
-   *return: set errno value in error case
-   */
-  fp=fopen(path,"r");
-
-  if(fp){
-    fprintf(stdout,"file opened.\n");
-
-    /*set offset to file end*/
-    /*fseek()
-     *stream
-     *offset
-     *origin
-     */
-    fseek(fp,0L,SEEK_END);
-    if (ferror(fp)){
-      printf ("Error seeking file\n");
-    }
-
-    /*get file size*/
-    lSize = ftell( fp );
-    fprintf(stdout,"lSize: %ld.\n",lSize);
-
-    /*set offset to file start*/
-    fseek(fp,0,SEEK_SET);
-    if (ferror(fp)){
-      printf ("Error seeking file\n");
-    }
-
-    /*allocate memory for entire content + null termination*/
-    *buf=(char *)malloc((lSize+1)*sizeof(char));
-    if(!*buf){
-      fclose(fp);
-      fputs("Error allocating memory",stderr);
-      exit(EXIT_FAILURE);
-    }
-    fprintf(stdout,"mem allocated.\n");
-
-    /*copy file into buffer*/
-    /*fread()
-     *ptr
-     *size
-     *count
-     *stream
-     */
-    if( 1!=fread(*buf,lSize,1,fp)){
-      fclose(fp);
-      free(*buf);
-      fputs("Error reading entire file",stderr);
-      exit(EXIT_FAILURE);
-    }
-    fprintf(stdout,"file read.\n");
-
-    /*close file*/
-    if(EOF==fclose(fp)){
-      free(*buf);
-      exit(EXIT_FAILURE);
-    }
-    fprintf(stdout,"file closed.\n");
-
-    (*buf)[lSize] = '\0';
-    fprintf(stdout,"mem null terminated.\n");
-
-    /*TODO Cleanup debugging!*/
-    /*
-    for (int i = 0; i < lSize; i++) {
-       printf("buffer[%d] == %c\n", i, buffer[i]);
-    }
-    */
-    printf("buffer = %s\n", *buf);
-    
-  }else{
-    perror(path);
-    exit(EXIT_FAILURE);
-  }
-  /*done*/
-  return lSize;
-}
+/*to user file2char*/
+#include "file2char.h"
 
 int main(int argc, char** argv){
   /*declaration*/
-  int  fileSize;
   char *buf;
 
   fprintf(stdout,"main() Started...\n");
@@ -109,11 +15,14 @@ int main(int argc, char** argv){
     fprintf(stderr, "Usage: %s <file path>\n", argv[0]);
     exit(EXIT_FAILURE);
   }
+  fprintf(stdout,"main() argv[1]: %s.\n",argv[1]);
 
-  
-  fileSize = load_file(argv[1], &buf);
+  if(!convert_file2char(argv[1], &buf)){
+    fprintf(stderr,"main() Error calling convert_file2char().\n");
+  }else{
+    fprintf(stdout,"main() convert_file2char() done.\n");
+  }
   free(buf);
-  fprintf(stdout,"main() fileSize: %d.\n",fileSize);
   fprintf(stdout,"main() Done.\n");
   return 0;
 }

file2char/makefile

@@ -2,7 +2,7 @@
 #	command
 #
 RM = /bin/rm -f
-OBJ = main.o
+OBJ = main.o file2char.o
 EXE = main
 CC = /usr/bin/gcc
 CFLAGS = -Wall
@@ -12,7 +12,10 @@ all: $(EXE)
 $(EXE): $(OBJ)
 	$(CC) $(CFLAGS) $(OBJ) -o $(EXE)
 #
-main.o: main.c
+file2char.o: file2char.c file2char.h
+	$(CC) -c file2char.c -o file2char.o
+#
+main.o: main.c file2char.h
 	$(CC) -c main.c -o main.o
 #
 clean: