platypus/platy_bt.c

167 lines
5.1 KiB
C
Executable File

/* File name: platy_bt.c
* Purpose:This is the main program for Assignment #1, CST8152, Winter 17
* Version: 1.17.1
* Author: Svillen Ranev
* Date: 9 January 2017
*/
/* The #define _CRT_SECURE_NO_WARNINGS should be used in MS Visual Studio projects
* to suppress the warnings about using "unsafe" functions like fopen()
* and standard sting library functions defined in string.h.
* The define directive does not have any effect on other compiler projects (gcc, Borland).
*/
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "buffer.h"
/* constant definitions */
#define INIT_CAPACITY 200 /* initial buffer capacity */
#define INC_FACTOR 15 /* increment factor */
/*check for ANSI C compliancy */
#define ANSI_C 0
#if defined(__STDC__)
#undef ANSI_C
#define ANSI_C 1
#endif
/* Declaration of an error printing function with
* variable number of arguments
*/
void err_printf(char *fmt, ...);
/* Declaration of a buffer contents display function */
void display (Buffer *ptr_Buffer);
long get_filesize(char *fname);
int main(int argc, char **argv){
pBuffer ptr_Buffer; /* pointer to Buffer structure */
FILE *fi; /* input file handle */
int loadsize = 0; /*the size of the file loaded in the buffer */
int ansi_c = !ANSI_C; /* ANSI C compliancy flag */
/* Check if the compiler option is set to compile ANSI C */
/* __DATE__, __TIME__, __LINE__, __FILE__, __STDC__ are predefined preprocessor macros*/
if(ansi_c){
err_printf("Date: %s Time: %s",__DATE__, __TIME__);
err_printf("ERROR: Compiler is not ANSI C compliant!\n");
exit(1);
}
/* missing file name or/and mode parameter */
if (argc <= 2){
err_printf("\nDate: %s Time: %s",__DATE__, __TIME__);
err_printf("\nRuntime error at line %d in file %s\n", __LINE__, __FILE__);
err_printf("%s\b\b\b\b%s%s",argv[0],": ","Missing parameters.");
err_printf("Usage: platybt source_file_name mode");
exit(1);
}
/* create a source code input buffer */
switch(*argv[2]){
case 'f': case 'a': case 'm': break;
default:
err_printf("%s%s%s",argv[0],": ","Wrong mode parameter.");
exit(1);
}
/*create the input buffer */
ptr_Buffer = b_create(INIT_CAPACITY,INC_FACTOR,*argv[2]);
if (ptr_Buffer == NULL){
err_printf("%s%s%s",argv[0],": ","Could not create buffer.");
exit(1);
}
/* open the source file */
if ((fi = fopen(argv[1],"r")) == NULL){
err_printf("%s%s%s%s",argv[0],": ", "Cannot open file: ",argv[1]);
exit (1);
}
/* load a source file into the input buffer */
printf("Reading file %s ....Please wait\n",argv[1]);
loadsize = b_load (fi,ptr_Buffer);
if(loadsize == R_FAIL1)
err_printf("%s%s%s",argv[0],": ","Error in loading buffer.");
/* close the source file */
fclose(fi);
/*find the size of the file */
if (loadsize == LOAD_FAIL){
printf("The input file %s %s\n", argv[1],"is not completely loaded.");
printf("Input file size: %ld\n", get_filesize(argv[1]));
}
/* set a mark at the last char in the buffer*/
b_setmark(ptr_Buffer,b_size(ptr_Buffer));
/* display the contents of the input buffer */
display(ptr_Buffer);
/* pack the buffer
* if possible, add end-of-file character (EOF) to the buffer
* display again
*/
if(b_pack(ptr_Buffer)){
if(!b_addc(ptr_Buffer, EOF))
err_printf("%s%s%s",argv[0],": ","Error in writing to buffer.");
display(ptr_Buffer);
}
/* free the dynamic memory used by the buffer */
b_free(ptr_Buffer);
/* make the buffer invalid
It is not necessary here because the function terminates anyway,
but will prevent run-time errors and crashes in future expansions
*/
ptr_Buffer = NULL;
/*return success */
return (0);
}
/* error printing function with variable number of arguments*/
void err_printf( char *fmt, ... ){
/*Initialize variable list */
va_list ap;
va_start(ap, fmt);
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
/* Move to new line */
if( strchr(fmt,'\n') == NULL )
fprintf(stderr,"\n");
}
void display (Buffer *ptr_Buffer){
printf("\nPrinting buffer parameters:\n\n");
printf("The capacity of the buffer is: %d\n",b_capacity(ptr_Buffer));
printf("The current size of the buffer is: %d\n",b_size(ptr_Buffer));
printf("The operational mode of the buffer is: %d\n",b_mode(ptr_Buffer));
printf("The increment factor of the buffer is: %u\n",b_incfactor(ptr_Buffer));
printf("The current mark of the buffer is: %d\n",b_mark(ptr_Buffer));
/*printf("The reallocation flag is: %d\n",b_rflag(ptr_Buffer));*/
printf("\nPrinting buffer contents:\n\n");
b_print(ptr_Buffer);
}
long get_filesize(char *fname){
FILE *input;
long flength;
input = fopen(fname, "r");
if(input == NULL){
err_printf("%s%s","Cannot open file: ",fname);
return 0;
}
fseek(input, 0L, SEEK_END);
flength = ftell(input);
fclose(input);
return flength;
}