93 lines
2.2 KiB
Objective-C
93 lines
2.2 KiB
Objective-C
#include <stdio.h>
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#include <dlfcn.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <Foundation/Foundation.h>
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static FILE *(*libc_fopen)(const char *, const char *) = NULL;
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__attribute__((constructor))
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static void pre_main(void)
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{
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/*
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* Pull reference to fopen(3) from libc.
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*/
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void *handle = dlopen("libSystem.B.dylib",RTLD_LAZY);
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if (handle) {
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libc_fopen = dlsym(handle,"fopen");
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dlclose(handle);
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}
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/*
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* Change to Documents directory.
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*/
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NSString *docs = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
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NSFileManager *filemgr = [NSFileManager defaultManager];
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[filemgr changeCurrentDirectoryPath: docs];
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[filemgr release];
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}
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char *mkdirhier(char *path)
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{
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char *slash;
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struct stat buf;
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if (path[0]=='.' && path[1]=='/') path+=2;
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if ((slash = strrchr(path,'/'))) {
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*slash = '\0';
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if (stat(path,&buf)==0) {
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*slash = '/';
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return NULL;
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}
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(void)mkdirhier(path);
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mkdir (path,0777);
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*slash = '/';
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}
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return slash;
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}
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/*
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* Replacement fopen(3)
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*/
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FILE *fopen(const char *filename, const char *mode)
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{
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FILE *ret;
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if ((ret = (*libc_fopen)(filename,mode)) == NULL) {
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/*
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* If file is not present in Documents directory, try from Bundle.
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*/
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NSString *nsspath = [NSString stringWithFormat:@"%@/%s",
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[[NSBundle mainBundle] bundlePath],
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filename];
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if ((ret = (*libc_fopen)([nsspath cStringUsingEncoding:NSUTF8StringEncoding],mode)) == NULL &&
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mode[0]=='w' &&
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((filename[0]!='.' && filename[0]!='/') ||
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(filename[0]=='.' && filename[1]=='/')) ) {
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/*
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* If not present in Bundle, create directory in Documents
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*/
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char *path = strdup(filename), *slash;
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static int once = 1;
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if ((slash = mkdirhier(path)) && once) {
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/*
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* For some reason iOS truncates first created file
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* upon program exit, so we create one preemptively...
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*/
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once = 0;
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strcpy(slash,"/.0");
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creat(path,0444);
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}
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free(path);
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ret = (*libc_fopen)(filename,mode);
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}
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}
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return ret;
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}
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