144 lines
3.0 KiB
C
144 lines
3.0 KiB
C
/* ex1-c: Advent2020 game, day 8/game 1
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*/
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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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struct instr {
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struct instr *next;
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int instr;
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int val;
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int visited;
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};
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struct program {
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unsigned length;
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unsigned total;
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struct instr *prg;
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};
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#define BLOCKSIZE 1024 /* number of elements for realloc() */
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#define NOP 0
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#define ACC 1
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#define JMP 2
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void print_instr(prg, step, cur)
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struct program *prg;
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int step;
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int cur;
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{
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struct instr *instr=prg->prg+step;
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char *op="unknown";
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switch (instr->instr) {
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case NOP:
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op="nop";
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break;
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case JMP:
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op="jmp";
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break;
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case ACC:
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op="acc";
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break;
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}
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fprintf(stderr, "%03d: [%s][%4d] -> %4d\n", step, op, instr->val, cur);
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}
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void print_prg(prg)
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struct program *prg;
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{
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unsigned i, psize=prg->length;
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struct instr *pinstr=prg->prg;
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fprintf(stderr, "PROGRAM: address=%p pinstr=%p size=%d\n", prg, pinstr, psize);
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for (i=0; i<psize; ++i)
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print_instr(prg, i, 0);
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}
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static struct program *add_line(prg, line)
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struct program *prg;
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char *line;
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{
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char sinstr[80];
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int val;
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unsigned cur, total;
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struct instr *pinstr;
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if (!prg) {
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prg=malloc(sizeof (struct program));
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prg->prg=malloc(sizeof(struct instr)*BLOCKSIZE);
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//fprintf(stderr, "alloc buf: prg=%p prog=%p\n", prg, prg->prg);
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prg->length=0;
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prg->total=BLOCKSIZE;
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}
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cur=prg->length;
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total=prg->total;
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if (cur == total) {
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total+=BLOCKSIZE;
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prg->total=total;
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prg->prg=realloc(prg->prg, sizeof(struct instr)*total);
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//fprintf(stderr, "realloc buf: cur=%d total=%d prog=%p\n", cur, total, prg->prg);
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}
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pinstr=prg->prg+cur;
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sscanf(line, "%s %d", sinstr, &val);
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pinstr->visited=0;
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pinstr->val=val;
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if (!strcmp(sinstr, "jmp"))
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pinstr->instr=JMP;
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else if (!strcmp(sinstr, "acc"))
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pinstr->instr=ACC;
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else pinstr->instr=NOP;
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prg->length++;
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return prg;
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}
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int run(prg)
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struct program *prg;
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{
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int cur=0, length=prg->length;
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struct instr *instr=prg->prg;
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int res=0;
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//fprintf(stderr, "RUN: address=%p prg=%p size=%d\n", prg, instr, length);
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while (cur>=0 && cur<length) {
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instr=prg->prg+cur;
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//print_instr(prg, cur, res);
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if (instr->visited) {
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break;
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}
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instr->visited=1;
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switch (instr->instr) {
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case NOP:
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cur++;
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break;
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case JMP:
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cur+=instr->val;
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break;
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case ACC:
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res+=instr->val;
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cur++;
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break;
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}
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}
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return res;
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}
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int main(ac, av)
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char **av;
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{
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char line[512];
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struct program *prg=NULL;
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while (fgets(line, sizeof line, stdin)) {
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prg=add_line(prg, line);
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}
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//print_prg(prg);
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printf("%s : res=%d\n", *av, run(prg));
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exit(0);
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}
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