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X4/try_catch.c

Last active December 4, 2015 12:44
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try_catch.c
/* C-Standard-Libraries */
#ifndef LIBRARIES
#define LIBRARIES
#include <stdio.h> /* stdio.h — standard buffered input/output */
#include <stdlib.h> /* stdlib.h — standard library definitions */
#include <string.h> /* string.h — string operations */
#include <stdarg.h> /* stdarg.h — handle variable argument list */
#include <stdbool.h> /* stdbool.h — boolean type and values */
#include <stddef.h> /* stddef.h — standard type definitions */
#include <ctype.h> /* ctype.h — character types */
#include <sys/types.h> /* stat.h – stat, fstat, lstat - get file status */
#include <sys/stat.h>
#include <unistd.h> /* unistd.h — standard symbolic constants and types */
#include <errno.h> /* errno.h — system error numbers */
#include <setjmp.h> /* setjmp.h — stack environment declarations */
#endif /*====LIBRARIES================================================*/
#ifndef MACROS
#define MACROS
/* I/O Errorcodes */
#define OPEN_ERROR 100
#define READ_ERROR 101
#define CLOSE_ERROR 102
#define VERSION_ERROR 103
#define INVALID_ERROR 104
#define PROGRAM_MEMORY_ERROR 105
#define DATA_MEMORY_ERROR 106
/* CommandLine Errorcodes */
#define SHOW_VERSION 200
#define SHOW_HELP 201
#define UNKNOWN_OPTION 202
#define INPUT_OVERFLOW 203
#define NO_INPUT 204
#endif /*====MACROS===================================================*/
#ifndef MAKRO_FUNCTIONS
#define MAKRO_FUNCTIONS
/* Try/Catch Emulation */
#define Try do { jmp_buf ex_buf__; switch( setjmp(ex_buf__) ) { case 0: while(1) {
#define Catch(x) break; case x:
#define Finally break; } default: {
#define ETry break; } } }while(0)
#define Throw(x) longjmp(ex_buf__, x)
#endif /*====MAKRO_FUNCTIONS========================================*/
void *allocate(unsigned size) {
void *p;
p = malloc(size);
if(p == NULL)
error("out of memory");
return(p);
}
void release(void *p) {
if(p == NULL)
error("NULL pointer detected");
free(p);
}
void error(char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
printf("Error: ");
vprintf(fmt, ap);
printf("\n");
va_end(ap);
exit(EXIT_FAILURE);
}
int loadCode(const char *codeFileName) {
unsigned int *codeData = NULL;
int codeSize = 0;
FILE *codeFile;
file_t fileInfo;
Try {
if(codeFileName == NULL)
Throw( NO_INPUT );
codeFile = fopen(codeFileName, "r");
if(codeFile == NULL)
Throw( OPEN_ERROR );
codeData = allocate(codeSize);
if(codeData == NULL)
Throw( DATA_MEMORY_ERROR );
fileInfo = getFileInfo(codeFile);
if(strcmp(fileInfo.magicBit, "NJBF") != 0)
Throw( INVALID_ERROR );
if(fileInfo.version != NJVM_VERSION)
Throw( VERSION_ERROR );
}
Catch( NO_INPUT ) {
error("no code file specified");
}
Catch( OPEN_ERROR ) {
error("cannot open code file '%s'", codeFileName);
}
Catch( READ_ERROR ) {
error("cannot read code file '%s'", codeFileName);
}
Catch( CLOSE_ERROR ) {
error("cannot close code file '%s'", codeFileName);
}
Catch( VERSION_ERROR ) {
error("file '%s' has wrong version number", codeFileName);
}
Catch( INVALID_ERROR ) {
error("file '%s' is not a Ninja binary", codeFileName);
}
Catch( PROGRAM_MEMORY_ERROR ) {
error("cannot allocate program memory");
}
Catch( DATA_MEMORY_ERROR ) {
error("cannot allocate data memory");
}
ETry;
return(0);
}
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