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///usr/bin/true; gcc -std=c2x -Wall -Wextra -Wpedantic -pedantic-errors -fanalyzer -Wanalyzer-too-complex -ggdb -g3 -O0 main.c -o main && ./main; exit $?
// #include <errno.h>
// #include <error.h>
// #include <stdio.h>
// #include <threads.h>
// #include <unistd.h>
// #include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <string.h>
#include <stdio.h>
void * xcalloc(size_t nmemb, size_t size) {
void *mem = calloc(nmemb, size);
if(!mem)
abort();
return mem;
}
typedef void (*fcallback)(void*);
typedef struct gdata {
void *data;
fcallback freer;
} gdata;
gdata * gdata_init(void *data, fcallback fcb) {
gdata *gd = xcalloc(1, sizeof(*gd));
gd->data = data;
gd->freer = fcb;
return gd;
}
void gdata_free(gdata *gd) {
if(!gd)
return;
if(gd->freer != NULL)
gd->freer(gd->data);
free(gd);
return;
}
void * gdata_getdata(gdata * const gd) {
if(!gd) {
errno = EINVAL;
return NULL;
}
return gd->data;
}
void gdata_destruct(gdata *gd, void **storage) {
if(!gd || !storage)
return;
*storage = gd->data;
free(gd);
return;
}
typedef struct stack {
gdata **arr;
int size;
int used;
} stack;
stack * stack_init(int size) {
if(size < 1)
return NULL;
stack *st = xcalloc(1, sizeof(*st));
st->size = size;
st->used = 0;
st->arr = xcalloc(st->size, sizeof(gdata*));
return st;
}
void stack_free(stack *st) {
if(!st)
return;
for(int i = 0; i < st->used; i++)
gdata_free(st->arr[i]);
free(st->arr);
free(st);
return;
}
int stack_push(stack *st, gdata *data) {
if(!st || !data)
return -1;
if(st->used == st->size)
return 0;
st->arr[st->used++] = data;
return st->used;
}
int stack_pushd(stack *st, void *data, fcallback fcb) {
return stack_push(st, gdata_init(data, fcb));
}
gdata * stack_pop(stack *st) {
if(!st)
return NULL;
if(st->used <= 0)
return NULL;
gdata *gd = st->arr[--st->used];
return gd;
}
void * stack_popd(stack *st) {
gdata *gd = stack_pop(st);
void *data = NULL;
gdata_destruct(gd, &data);
return data;
}
int main() {
// stack *st = stack_init(10);
// stack_pushd(st, (void*)10, NULL);
// stack_pushd(st, (void*)11, NULL);
// stack_pushd(st, (void*)12, NULL);
// stack_pushd(st, strdup("This is some data"), free);
// char *data = stack_popd(st);
// printf("%s\n", (data) ? data : "null");
// free(data);
// stack_free(st);
return 0;
}
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