261 lines
7.1 KiB
C
Executable File
261 lines
7.1 KiB
C
Executable File
/* File name: platy_st.c
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* Purpose:This is the main program for Assignment #2 - Scanner
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* CST8152 - Compilers
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* Version: 1.17.1
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* Author: S^R
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* Date: 30 January 2017
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*/
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/* The #define _CRT_SECURE_NO_WARNINGS should be used in MS Visual Studio projects
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* to suppress the warnings about using "unsafe" functions like fopen()
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* and standard sting library functions defined in string.h.
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* The define does not have any effect in other compiler projects.
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*/
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#define _CRT_SECURE_NO_WARNINGS
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include "buffer.h"
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#include "token.h"
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/* constant definitions */
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#define INIT_CAPACITY 200 /* initial buffer capacity */
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#define INC_FACTOR 15 /* increment factor */
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#define STR_INIT_CAPACITY 100 /* initial string literal table capacity */
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#define STR_CAPACITY_INC 50 /* initial string literal table capacity inc */
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/*check for ANSI C compliancy */
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#define ANSI_C 0
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#if defined(__STDC__)
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#undef ANSI_C
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#define ANSI_C 1
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#endif
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/* Global objects - variables */
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Buffer * str_LTBL; /* this buffer implements String Literal Table */
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/* it is used as a repository for string literals */
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int scerrnum; /* run-time error number = 0 by default (ANSI) */
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/*external objects */
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extern int line; /* source code line numbers - defined in scanner.c */
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extern int scanner_init(Buffer * sc_buf);
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extern Token malar_next_token(Buffer * sc_buf);
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/*function declarations */
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void err_printf(char *fmt, ...);
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void display (Buffer *ptrBuffer);
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long get_filesize(char *fname);
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void print_token(Token t);
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/* main function takes a PLATYPUS source file as
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* an argument at the command line.
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* usage: scanner source_file_name"
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*/
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int main(int argc, char ** argv){
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Buffer *sc_buf; /* pointer to input (source) buffer */
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FILE *fi; /* input file handle */
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Token t; /* token produced by the scanner */
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int loadsize = 0; /*the size of the file loaded in the buffer */
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int ansi_c = !ANSI_C; /* ANSI C compliancy flag */
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/* Check if the compiler option is set to compile ANSI C */
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/* __DATE__, __TIME__, __LINE__, __FILE__, __STDC__ are predefined preprocessor macros*/
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if(ansi_c){
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err_printf("Date: %s Time: %s",__DATE__, __TIME__);
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err_printf("ERROR: Compiler is not ANSI C compliant!\n");
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exit(1);
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}
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/*check for correct arrguments - source file name */
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if (argc <= 1){
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/* __DATE__, __TIME__, __LINE__, __FILE__ are predefined preprocessor macros*/
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err_printf("Date: %s Time: %s",__DATE__, __TIME__);
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err_printf("Runtime error at line %d in file %s", __LINE__, __FILE__);
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err_printf("%s%s%s",argv[0],": ","Missing source file name.");
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err_printf("%s%s%s","Usage: ", "scanner", " source_file_name");
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exit(1);
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}
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/* create a source code input buffer - multiplicative mode */
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sc_buf = b_create(INIT_CAPACITY,INC_FACTOR,'m');
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if (sc_buf == NULL){
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err_printf("%s%s%s",argv[0],": ","Could not create source buffer");
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exit(1);
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}
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/*open source file */
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if ((fi = fopen(argv[1],"r")) == NULL){
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err_printf("%s%s%s%s",argv[0],": ", "Cannot open file: ",argv[1]);
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exit (1);
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}
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/* load source file into input buffer */
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printf("Reading file %s ....Please wait\n",argv[1]);
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loadsize = b_load (fi,sc_buf);
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if (loadsize == R_FAIL1)
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err_printf("%s%s%s",argv[0],": ","Error in loading buffer.");
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/* close source file */
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fclose(fi);
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/*find the size of the file */
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if (loadsize == LOAD_FAIL){
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printf("The input file %s %s\n", argv[1],"is not completely loaded.");
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printf("Input file size: %ld\n", get_filesize(argv[1]));
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}
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/* pack and display the source buffer */
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if(b_pack(sc_buf)){
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display(sc_buf);
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}
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/* create string Literal Table */
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str_LTBL = b_create(INIT_CAPACITY,INC_FACTOR,'a');
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if (str_LTBL == NULL){
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err_printf("%s%s%s",argv[0],": ","Could not create string literals buffer");
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exit(1);
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}
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/*Testbed for the scanner */
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/* add SEOF to input program buffer*/
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b_addc(sc_buf,'\0');
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/* Initialize scanner input buffer */
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if(scanner_init(sc_buf)){;
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err_printf("%s%s%s",argv[0],": ","Empty program buffer - scanning canceled");
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exit(1);
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}
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printf("\nScanning source file...\n\n");
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printf("Token\t\tAttribute\n");
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printf("----------------------------------\n");
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do{
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t= malar_next_token(sc_buf);
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print_token(t);
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}while(t.code != SEOF_T);
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if(b_size(str_LTBL)) b_print(str_LTBL);
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b_free(sc_buf);
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b_free(str_LTBL);
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sc_buf = str_LTBL = NULL;
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return (0);
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}
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/* Error printing function with variable number of arguments
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*/
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void err_printf( char *fmt, ... ){
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va_list ap;
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va_start(ap, fmt);
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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/* Move to new line */
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if( strchr(fmt,'\n') == NULL )
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fprintf(stderr,"\n");
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}
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/* The function displays buffer contents
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*/
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void display (Buffer *ptrBuffer){
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printf("\nPrinting buffer parameters:\n\n");
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printf("The capacity of the buffer is: %d\n",b_capacity(ptrBuffer));
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printf("The current size of the buffer is: %d\n",b_size(ptrBuffer));
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printf("\nPrinting buffer contents:\n\n");
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b_print(ptrBuffer);
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}
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long get_filesize(char *fname){
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FILE *input;
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long flength;
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input = fopen(fname, "r");
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if (input == NULL){
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err_printf("%s%s", "Cannot open file: ", fname);
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return 0L;
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}
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fseek(input, 0L, SEEK_END);
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flength = ftell(input);
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fclose(input);
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return flength;
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}
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/* The function prints the token returned by the scanner
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*/
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void print_token(Token t){
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extern char * kw_table []; /* link to keyword table in */
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switch(t.code){
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case ERR_T:
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printf("ERR_T\t\t%s",t.attribute.err_lex);
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if(scerrnum){
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printf("%d",scerrnum);
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exit(scerrnum);
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}printf("\n");
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break;
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case SEOF_T:
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printf("SEOF_T\n" );
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break;
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case AVID_T:
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printf("AVID_T\t\t%d\n",t.attribute.vid_offset);
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break;
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case SVID_T:
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printf("SVID_T\t\t%d\n",t.attribute.vid_offset);
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break;
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case FPL_T:
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printf("FPL_T\t\t%f\n",t.attribute.flt_value);
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break;
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case INL_T:
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printf("IL_T\t\t%d\n",t.attribute.get_int);
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break;
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case STR_T:
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printf("STR_T\t\t%d\t ",(short)t.attribute.get_int);
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printf("%s\n", b_setmark(str_LTBL, (short)t.attribute.get_int));
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break;
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case SCC_OP_T:
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printf("SCC_OP_T\n" );
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break;
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case ASS_OP_T:
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printf("ASS_OP_T\n" );
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break;
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case ART_OP_T:
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printf("ART_OP_T\t%d\n",t.attribute.get_int);
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break;
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case REL_OP_T:
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printf("REL_OP_T\t%d\n",t.attribute.get_int);
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break;
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case LOG_OP_T:
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printf("LOG_OP_T\t%d\n",t.attribute.get_int);
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break;
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case LPR_T:
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printf("LPR_T\n" );
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break;
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case RPR_T:
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printf("RPR_T\n" );
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break;
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case LBR_T:
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printf("LBR_T\n" );
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break;
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case RBR_T:
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printf("RBR_T\n" );
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break;
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case KW_T:
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printf("KW_T\t\t%s\n",kw_table [t.attribute.get_int]);
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break;
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case COM_T:
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printf("COM_T\n");
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break;
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case EOS_T:
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printf("EOS_T\n" );
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break;
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default:
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printf("Scanner error: invalid token code: %d\n", t.code);
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}
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}
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