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This commit is contained in:
Illia Korpan 2026-04-15 09:11:12 +02:00
parent 72dadabd6e
commit c65260b1fe
1 changed files with 9 additions and 19 deletions
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28
du5/program.c
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@ -11,7 +11,6 @@ typedef struct Node {
struct Node *no; struct Node *no;
} Node; } Node;
// portable strdup replacement
static char *my_strdup(const char *s) { static char *my_strdup(const char *s) {
if (!s) return NULL; if (!s) return NULL;
size_t l = strlen(s) + 1; size_t l = strlen(s) + 1;
@ -21,7 +20,6 @@ static char *my_strdup(const char *s) {
return p; return p;
} }
// getline prototype (POSIX); declaring to avoid implicit declaration warnings
ssize_t getline(char **__lineptr, size_t *__n, FILE *__stream); ssize_t getline(char **__lineptr, size_t *__n, FILE *__stream);
static char *trim_newline(char *s) { static char *trim_newline(char *s) {
@ -43,7 +41,6 @@ Node *parse_node(char **lines, int n, int *idx, int *err) {
char *line = lines[*idx]; char *line = lines[*idx];
(*idx)++; (*idx)++;
if (line[0] == '*') { if (line[0] == '*') {
// answer node
char *txt = line + 1; char *txt = line + 1;
txt = ltrim(txt); txt = ltrim(txt);
Node *node = malloc(sizeof(Node)); Node *node = malloc(sizeof(Node));
@ -53,15 +50,14 @@ Node *parse_node(char **lines, int n, int *idx, int *err) {
node->yes = node->no = NULL; node->yes = node->no = NULL;
return node; return node;
} else { } else {
// question node Node *node = malloc(sizeof(Node));
Node *node = malloc(sizeof(Node));
if (!node) { *err = 1; return NULL; } if (!node) { *err = 1; return NULL; }
node->is_answer = 0; node->is_answer = 0;
node->text = my_strdup(line); node->text = my_strdup(line);
node->yes = parse_node(lines, n, idx, err); node->yes = parse_node(lines, n, idx, err);
if (*err) { free(node->text); free(node); return NULL; } if (*err) { free(node->text); free(node); return NULL; }
node->no = parse_node(lines, n, idx, err); node->no = parse_node(lines, n, idx, err);
if (*err) { // free subtree? skip deep frees for brevity if (*err) {
free(node->text); free(node); return NULL; free(node->text); free(node); return NULL;
} }
return node; return node;
@ -83,7 +79,6 @@ void free_tree(Node *root) {
} }
int main(void) { int main(void) {
// Read lines until an empty line (or EOF)
char *line = NULL; char *line = NULL;
size_t cap = 0; size_t cap = 0;
ssize_t len; ssize_t len;
@ -92,10 +87,8 @@ int main(void) {
while ((len = getline(&line, &cap, stdin)) != -1) { while ((len = getline(&line, &cap, stdin)) != -1) {
trim_newline(line); trim_newline(line);
// stop at blank line
if (line[0] == '\0') break; if (line[0] == '\0') break;
// store a copy char *copy = my_strdup(line);
char *copy = my_strdup(line);
if (!copy) { fprintf(stderr, "Chyba pri alokácii pamäte\n"); return 1; } if (!copy) { fprintf(stderr, "Chyba pri alokácii pamäte\n"); return 1; }
lines = realloc(lines, sizeof(char*) * (lines_count + 1)); lines = realloc(lines, sizeof(char*) * (lines_count + 1));
if (!lines) { fprintf(stderr, "Chyba pri alokácii pamäte\n"); return 1; } if (!lines) { fprintf(stderr, "Chyba pri alokácii pamäte\n"); return 1; }
@ -120,26 +113,22 @@ int main(void) {
} }
int leaves = count_answers(root); int leaves = count_answers(root);
// print number of goods (answers) printf("Expert z bufetu to vie.\n");
printf("%d\n", leaves); printf("Pozna %d druhov ovocia a zeleniny.\n", leaves);
printf("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.\n");
// interactive session: use 'a' for áno (yes) and 'n' for nie (no)
Node *cur = root; Node *cur = root;
char buf[128]; char buf[128];
while (cur) { while (cur) {
if (cur->is_answer) { if (cur->is_answer) {
// print answer and exit printf("* %s\n", cur->text);
printf("Odpoveď: %s\n", cur->text);
break; break;
} }
// question
printf("%s\n", cur->text); printf("%s\n", cur->text);
if (!fgets(buf, sizeof(buf), stdin)) { if (!fgets(buf, sizeof(buf), stdin)) {
// EOF or error
printf("Nesprávny vstup\n"); printf("Nesprávny vstup\n");
break; break;
} }
// skip whitespace and take first non-space char
char *p = buf; char *p = buf;
while (*p && isspace((unsigned char)*p)) p++; while (*p && isspace((unsigned char)*p)) p++;
char c = *p; char c = *p;
@ -152,6 +141,7 @@ int main(void) {
break; break;
} }
} }
printf("Koniec\n");
free_tree(root); free_tree(root);
for (int i = 0; i < lines_count; ++i) free(lines[i]); for (int i = 0; i < lines_count; ++i) free(lines[i]);