minecraft-pi-reborn/mods/src/override/override.c

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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
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#include <libreborn/libreborn.h>
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static int starts_with(const char *s, const char *t) {
return strncmp(s, t, strlen(t)) == 0;
}
static char *get_override_path(const char *filename) {
// Get Asset Override Path
char *overrides = NULL;
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asprintf(&overrides, "%s/.minecraft-pi/overrides", getenv("HOME"));
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ALLOC_CHECK(overrides);
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// Get data Path
char *data = NULL;
char *cwd = getcwd(NULL, 0);
asprintf(&data, "%s/data", cwd);
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ALLOC_CHECK(data);
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free(cwd);
// Get Full Path
char *new_path = NULL;
char *full_path = realpath(filename, NULL);
if (full_path != NULL) {
if (starts_with(full_path, data)) {
asprintf(&new_path, "%s%s", overrides, &full_path[strlen(data)]);
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ALLOC_CHECK(new_path);
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if (access(new_path, F_OK) == -1) {
free(new_path);
new_path = NULL;
}
}
free(full_path);
}
// Free Variables
free(overrides);
free(data);
// Return
return new_path;
}
HOOK(fopen, FILE *, (const char *filename, const char *mode)) {
char *new_path = get_override_path(filename);
// Open File
ensure_fopen();
FILE *file = (*real_fopen)(new_path != NULL ? new_path : filename, mode);
// Free Data
if (new_path != NULL) {
free(new_path);
}
// Return File
return file;
}
HOOK(fopen64, FILE *, (const char *filename, const char *mode)) {
char *new_path = get_override_path(filename);
// Open File
ensure_fopen64();
FILE *file = (*real_fopen64)(new_path != NULL ? new_path : filename, mode);
// Free Data
if (new_path != NULL) {
free(new_path);
}
// Return File
return file;
}