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Prevented memory under and overun

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id101010
2016-11-10 02:08:40 +01:00
parent 619a559f06
commit f5d7aa90c4
1 changed files with 16 additions and 3 deletions
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19
bfckr.c
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@@ -15,11 +15,12 @@
// Amount of memory on the band tape // Amount of memory on the band tape
#define MEMORY_SIZE 10000 #define MEMORY_SIZE 10000
#define MAX_INPUT_SIZE 1000 #define MAX_INPUT_SIZE 10000
// Memory initialized with zeros and its pointer // Memory initialized with zeros and its pointer
char memory[MEMORY_SIZE] = {0}; char memory[MEMORY_SIZE] = {0};
char *p = memory; char *p = memory;
int memcnt = 0;
// Prototypes // Prototypes
void bfuck_parser(char *input); void bfuck_parser(char *input);
@@ -44,11 +45,23 @@ void bfuck_parser(char *input)
for(size_t i = 0; input[i] != 0; i++) { // where i is the instruction pointer for(size_t i = 0; input[i] != 0; i++) { // where i is the instruction pointer
switch(input[i]) { switch(input[i]) {
case '>': case '>':
++p; // increment data pointer if(memcnt >= MEMORY_SIZE) { // prevent overrun
p = &memory[0];
memcnt = 0;
} else {
++p; // increment data pointer
++memcnt;
}
break; break;
case '<': case '<':
--p; // decrement data pointer if(memcnt < 0) { // prevent underun
p = &memory[MEMORY_SIZE - 1];
memcnt = MEMORY_SIZE - 1;
} else {
--p; // decrement data pointer
--memcnt;
}
break; break;
case '+': case '+':