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platypus/platy_tt.c

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/* File name: platy_tt.c
* Purpose:This is the main program for Assignment #3 - Symbol Table
* CST8152 - Compilers
* Version: 1.17.01
* Author: S^R
* Date: 1 March 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 does not have any effect in other compiler projects.
*/
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h> /* Constants for calls to exit()*/
#include <string.h>
#include <stdarg.h>
#include "buffer.h"
#include "token.h"
#include "stable.h" /*Do not remove this line. SiR */
/* constant definitions */
/* Input buffer parameters */
#define INIT_CAPACITY 200 /* initial buffer capacity */
#define INC_FACTOR 15 /* increment factor */
/* String Literal Table parameters */
#define STR_INIT_CAPACITY 100 /* initial string literal table capacity */
#define STR_CAPACITY_INC 50 /* initial string literal table capacity inc */
/* Symbol Table default size */
#define ST_DEF_SIZE 100
/*check for ANSI C compliancy */
#define ANSI_C 0
#if defined(__STDC__)
#undef ANSI_C
#define ANSI_C 1
#endif
/* Global objects - variables */
static Buffer *sc_buf; /* pointer to input (source) buffer */
Buffer * str_LTBL; /* this buffer implements String Literal Table */
/* it is used as a repository for string literals */
int scerrnum; /* run-time error number = 0 by default (ANSI) */
STD sym_table; /* Symbol Table Descriptor */
/*external objects */
extern int line; /* source code line numbers - defined in scanner.c */
extern int scanner_init(Buffer * sc_buf);
extern Token malar_next_token(Buffer * sc_buf);
/*function declarations */
void err_printf(char *fmt, ...);
void display (Buffer *ptrBuffer);
long get_filesize(char *fname);
void garbage_collect(void);
/* The main function takes a PLATYPUS source file and optional switches
* as command line arguments.
* usage: stable source_file_name [-stz size][-sts:A | -sts:D]
*/
int main(int argc, char ** argv){
FILE *fi; /* input file handle */
Token t; /* token produced by the scanner */
int loadsize = 0; /*the size of the file loaded in the buffer */
int st_def_size = ST_DEF_SIZE; /* Sumbol Table default size */
char sort_st = 0; /*Symbol Table sort switch */
int ansi_c = !ANSI_C; /* ANSI C 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);
}
/*check for correct arrguments - source file name */
if (argc <= 1){
/* __DATE__, __TIME__, __LINE__, __FILE__ are predefined preprocessor macros*/
err_printf("Date: %s Time: %s",__DATE__, __TIME__);
err_printf("Runtime error at line %d in file %s", __LINE__, __FILE__);
err_printf("%s%s%s",argv[0],": ","Missing source file name.");
err_printf("%s%s%s","Usage: ", "stable", " source_file_name [-stz size][-sts:A | -sts:D]");
exit(EXIT_FAILURE);
}
/* check for optional switches - symbol table size and/or sort */
if (argc == 3){
if (strcmp(argv[2],"-sts:A") && strcmp(argv[2],"-sts:D") ){
err_printf("%s%s%s",argv[0],": ","Invalid switch.");
err_printf("%s%s\b\b\b\b%s","Usage: ", argv[0], " source file name [-stz size][-sts:A | -sts:D]");
exit(EXIT_FAILURE);
}
/*set sort switch*/
if(strcmp(argv[2],"-sts:A"))
sort_st = 'D';
else
sort_st = 'A';
}
/* symbol table size specified */
if (argc == 4){
if (strcmp(argv[2],"-stz")){
err_printf("%s%s%s",argv[0],": ","Invalid switch.");
err_printf("%s%s\b\b\b\b%s","Usage: ", argv[0], " source file name [-stz size][-sts:A | -sts:D]");
exit(EXIT_FAILURE);
}
/* convert the symbol table size */
st_def_size = atoi(argv[3]);
if (st_def_size <= 0){
err_printf("%s%s%s",argv[0],": ","Invalid switch.");
err_printf("%s%s\b\b\b\b%s","Usage: ", argv[0], " source file name [-stz size][-sts:A | -sts:D]");
exit(EXIT_FAILURE);
}
}
if (argc == 5){
if (strcmp(argv[2],"-stz")){
err_printf("%s%s%s",argv[0],": ","Invalid switch.");
err_printf("%s%s\b\b\b\b%s","Usage: ", argv[0], " source file name [-stz size][-sts:A | -sts:D]");
exit(EXIT_FAILURE);
}
/* convert the symbol table size */
st_def_size = atoi(argv[3]);
if (st_def_size <= 0){
err_printf("%s%s%s",argv[0],": ","Invalid switch.");
err_printf("%s%s\b\b\b\b%s","Usage: ", argv[0], " source file name [-stz size][-sts:A | -sts:D]");
exit(EXIT_FAILURE);
}
if (strcmp(argv[4],"-sts:A")&& strcmp(argv[4],"-sts:D") ){
err_printf("%s%s%s",argv[0],": ","Invalid switch.");
err_printf("%s%s\b\b\b\b%s","Usage: ", argv[0], " source file name [-stz size][-sts:A | -sts:D]");
exit(EXIT_FAILURE);
}
if(strcmp(argv[4],"-sts:A"))
sort_st = 'D';
else
sort_st = 'A';
}
/* create a source code input buffer - multiplicative mode */
sc_buf = b_create(INIT_CAPACITY,INC_FACTOR,'m');
if (sc_buf == NULL){
err_printf("%s%s%s",argv[0],": ","Could not create source buffer");
exit(EXIT_FAILURE);
}
/* create symbol table */
sym_table = st_create(st_def_size);
if (!sym_table.st_size){
err_printf("%s%s%s",argv[0],": ","Could not create symbol table");
exit (EXIT_FAILURE);
}
/*open 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 source file into input buffer */
printf("Reading file %s ....Please wait\n",argv[1]);
loadsize = b_load (fi,sc_buf);
if(loadsize == R_FAIL1)
err_printf("%s%s%s",argv[0],": ","Error in loading buffer.");
/* close 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]));
}
/* pack and display the source buffer */
if(b_pack(sc_buf)){
display(sc_buf);
}
/* create string Literal Table */
str_LTBL = b_create(INIT_CAPACITY,INC_FACTOR,'a');
if (str_LTBL == NULL){
err_printf("%s%s%s",argv[0],": ","Could not create string buffer");
exit(EXIT_FAILURE);
}
/*registrer exit function */
atexit(garbage_collect);
/*Testbed for the scanner and the symbol table*/
/* add SEOF to input program buffer*/
b_addc(sc_buf,'\0');
/* Initialize the scanner*/
if(scanner_init(sc_buf)){;
err_printf("%s%s%s",argv[0],": ","Empty program buffer - scanning canceled");
exit(1);
}
printf("Scanning source file...\n\n");
do{
t= malar_next_token(sc_buf);
}while(t.code != SEOF_T);
/* print Symbol Table */
if(sym_table.st_size){
st_print(sym_table);
if(sort_st){
printf("\nSorting symbol table...\n");
st_sort(sym_table,sort_st);
st_print(sym_table);
}
}
/*Test bed for type and update functions */
/*Test bed for bonus*/
return (0); /* same effect as exit(EXIT_SUCCESS) */
}
/* Error printing function with variable number of arguments
*/
void err_printf( char *fmt, ... ){
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");
}
/* The function return the size of an open file
*/
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;
}
/* The function display buffer contents
*/
void display (Buffer *ptrBuffer){
printf("\nPrinting input buffer parameters:\n\n");
printf("The capacity of the buffer is: %d\n",b_capacity(ptrBuffer));
printf("The current size of the buffer is: %d\n",b_size(ptrBuffer));
printf("The reallocation flag is: %d\n",b_rflag(ptrBuffer));
printf("\nPrinting input buffer contents:\n\n");
b_print(ptrBuffer);
}
/* The function frees all dynamically allocated memory.
This function is always called
despite how the program terminates - normally or abnormally.
*/
void garbage_collect(void){
printf("\nCollecting garbage...\n");
b_free(sc_buf);
b_free(str_LTBL);
st_destroy(sym_table);
}
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